Patent application number | Description | Published |
20090107461 | Direct Injection Fuel System with Reservoir - A method of operating a fuel delivery system for an internal combustion engine is described. The system may include a plurality of direct cylinder injectors, a fuel rail upstream of the injectors, a first pump, and a second pump coupled downstream of the first pump and to the fuel rail. The method may include, after or during engine shutdown, and during a fuel system cool down, activating the first pump; and varying the activation of the first pump responsive to temperature to maintain a higher pressure for high temperatures. Alternatively, in some examples, the system may include a reservoir in a bypass around the second pump, the bypass having a valve downstream of the fuel reservoir, where the valve is positioned vertically above the second pump and the fuel reservoir is positioned vertically above the valve. The fuel reservoir may be sized to hold a sufficient amount of fuel in the bypass to allow fuel to migrate from the bypass to the fuel rail during engine cool down. | 04-30-2009 |
20090114191 | LIFT PUMP CONTROL FOR A TWO PUMP DIRECT INJECTION FUEL SYSTEM - An economical method for controlling a lift pump operating as part of a direct injection fuel system is described. According to the method, at least two distinct operating modes are provided. | 05-07-2009 |
20090188472 | LIFT PUMP SYSTEM FOR A DIRECT INJECTION FUEL SYSTEM - An economical method for controlling a lift pump operating as part of a direct injection fuel system is described. According to the method, the lift pump is operated at efficient operating conditions and then stopped until additional fuel is requested. | 07-30-2009 |
20090260601 | FUEL DELIVERY SYSTEM DIAGNOSTICS AFTER SHUT-DOWN - A method for operation of a fuel delivery system in an internal combustion engine including a lower pressure pump, a higher pressure pump fluidly coupled downstream of the lower pressure pump, and a fuel rail fluidly coupled downstream of the high pressure pump. The method including initiating a mitigating action based on a fuel rail pressure response, the fuel rail pressure response occurring after an engine shut-down, where the mitigating action includes disabling vehicle operation if fuel rail pressure drops below a threshold value after activation of one of the pumps, the activation occurring before a subsequent engine start, the subsequent engine start occurring after the engine shut-down, and where the mitigating action includes adjusting operation of one of the pumps during the subsequent engine start if fuel rail pressure achieves at least the threshold value after or during the activation. | 10-22-2009 |
20090271090 | SYSTEM AND CONTROL METHOD FOR SELECTING FUEL TYPE FOR AN INTERNAL COMBUSTION ENGINE CAPABLE OF COMBUSTING A PLURALITY OF FUEL TYPES - A system and method for improving fuel usage of a dual fuel engine is described. Fuel type is delivered to engine cylinders in response to operating conditions. | 10-29-2009 |
20100017097 | FUEL BASED ENGINE OPERATION CONTROL - Methods are provided for operating an engine with a variable fuel blend in a cylinder, where the variable fuel blend varies a peak achievable engine torque for a given operating condition. One example method comprises selectively operating an engine actuator that affects engine torque and engine fuel economy at the given operating condition, and extending operation of the actuator to higher engine torques as a peak engine torque for the given operating condition increases. | 01-21-2010 |
20100024770 | FUEL DELIVERY SYSTEM FOR A MULTI-FUEL ENGINE - A fuel delivery system for a multi-fuel internal combustion engine and an approach for operating the fuel delivery system are provided. The fuel delivery system can be operated in two or more different fuel delivery modes according to operating conditions of the engine or fuel delivery system. A first example mode can be performed to concurrently deliver two or more fuels to the engine. A second example mode can be performed to transfer fuel from a first fuel storage tank to a second fuel storage tank. A third example mode can be performed to supply a fuel from a first fuel storage tank to at least two fuel injectors of each cylinder of the engine. In some embodiments, the various modes of operation may be selected by varying a fuel pressure that is provided by the fuel delivery system. | 02-04-2010 |
20100108035 | ADDRESSING FUEL PRESSURE UNCERTAINTY DURING STARTUP OF A DIRECT INJECTION ENGINE - An engine system and a method of starting an internal combustion engine of the engine system are described. In one embodiment, the method includes adjusting a fuel pressure within a fuel rail to a first value; after the fuel pressure within the fuel rail attains the first value, initiating delivery of fuel to the internal combustion engine from the fuel rail by successively injecting fuel directly into combustion chambers of the internal combustion engine; and after at least a first fuel injection event, reducing the fuel pressure within the fuel rail from the first value to a second value over subsequent successive fuel injection events by adjusting an operating parameter of the high pressure fuel pump. The method may optionally include increasing an air-fuel ratio over subsequent successive fuel injection events after fuel delivery is initiated by varying an amount of fuel that is directly injected into the combustion chambers. | 05-06-2010 |
20100114462 | CONTROL OF INTAKE PRESSURE FOR RESTART-ENABLED IDLE STOP - Methods and systems are provided for controlling an engine of a vehicle, the engine including an intake manifold, a cylinder, and an adjustable throttle upstream of the intake manifold. One example method includes operating the engine with combustion, and in response to operating conditions, during a stopped vehicle idle condition, and without a shut-down request by the operator, automatically initiating an engine shut down. Further, the example method may include during the automatically initiated engine shut down, adjusting the throttle to maintain manifold pressure at a first value, where during progression of the shut down, the first value is adjusted based on an operating parameter and restarting the engine before it reaches zero speed in response to a restart request. | 05-06-2010 |
20100139624 | HIGH PRESSURE FUEL PUMP CONTROL FOR IDLE TICK REDUCTION - A method for controlling a mechanical solenoid valve of a high-pressure fuel pump to supply fuel to an engine is provided. The method includes: during an idle condition, adjusting a pull-in current of the mechanical solenoid valve utilized to control closing of the mechanical solenoid valve based on a fuel pressure downstream of the high-pressure fuel pump, wherein the pull-in current is reduced when possible while enabling the mechanical solenoid valve to close as indicated by an increase in the downstream fuel pressure. | 06-10-2010 |
20100139628 | FUEL PREHEAT FOR ENGINE START - Systems and methods for providing heated fuel to a fuel injector of an engine are provided. One example method comprises maintaining a volume of fuel above a start-ready temperature during a pre-start interval, the pre-start interval beginning after the engine is turned off, beginning automatically, and ending when the engine is restarted, the start-ready temperature greater than a lowest temperature of the engine during the pre-start interval. The method further comprises delivering some of the volume of fuel to the fuel injector when the engine is about to be restarted. According to the approaches described herein, adequate cold-start fuel atomization may be provided without compromising driver satisfaction due to excessive pre-ignition delay, while at the same time reducing unnecessary heating of fuel during warm engine off conditions. Further, the approaches described herein may be enacted inexpensively in a wide variety of motor-vehicle configurations. | 06-10-2010 |
20100147270 | CRANKCASE BREECH DETECTION FOR BOOSTED ENGINES - Methods for indicating whether a crankcase of an engine is breeched are provided. One example method comprises restricting a communication of the crankcase with atmosphere, acting to increase or decrease a crankcase pressure, and indicating whether the crankcase is breeched based on the crankcase pressure. Another example method comprises sensing a crankcase pressure component, and indicating whether the crankcase is breeched based on the crankcase pressure component, the crankcase communicating with atmosphere via a conduit, a restrictedness of the conduit responsive to one or more of a crankcase pressure and a signal from an electronic control unit of the motor vehicle. Still other examples provide more particular methods for indicating whether the crankcase is breeched, and example configurations that enable the various methods. | 06-17-2010 |
20100170470 | FUEL DELIVERY SYSTEM FOR MULTI-FUEL ENGINE - A fuel delivery system for an engine and a method of its operation are described. The fuel delivery system includes a first fuel injector for delivering a first fuel to a cylinder of the engine; a second fuel injector for delivering a second fuel to the cylinder; an electrical relay system disposed between a first electrical potential and each of the first and second fuel injectors; an electronic driver disposed between a second electrical potential and each of the first and second fuel injectors; and a control module. The control module is configured to switch the electrical relay system between first and second positions to select one of the first and second fuels, respectively. The electronic driver is closed by the control module to deliver the selected one of the first or second fuel to the first cylinder via a respective one of the first or second fuel injectors. | 07-08-2010 |
20100174473 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Method and systems are provided for controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions. One example method comprises, adjusting a brake torque applied to a deactivated rotating engine after an engine restart request, the brake torque applied to slow the engine to at least a predetermined threshold speed without stopping the engine, and engaging a starter to the still rotating engine to increase the engine speed and restart the engine. | 07-08-2010 |
20100211288 | METHODS AND SYSTEMS FOR ENGINE STARTING - Methods and systems are provided for controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions and selectively reactivated during engine restart conditions. One example method comprises, during an engine restart from an idle stop, performing a first combustion event in a cylinder with a piston at an engine crankshaft position that is after a crankshaft position at which said cylinder's exhaust valve opens, and before a crankshaft position at which the cylinder's intake valve closes, during a cycle of said cylinder. | 08-19-2010 |
20100223984 | FUEL VAPOR PURGING DIAGNOSTICS - Systems and methods are provided for monitoring reverse flow of fuel vapors and/or air through a vehicle fuel vapor recovery system, said fuel vapor recovery system coupled to an engine intake of a boosted internal combustion engine. One example method comprises, intermittently adjusting a restriction in the fuel vapor recovery system during boosted conditions, and indicating degradation based on one or more of a change in a pressure value, or based on a change in flow in the fuel vapor recovery system. | 09-09-2010 |
20100244459 | METHODS AND SYSTEMS FOR ENGINE START CONTROL - Methods and systems are provided for starting an engine in a vehicle, the engine including a starter, the vehicle including a plurality of energy storage devices electrically coupled to the starter. One example method comprises, during a first charging condition, electrically coupling the plurality of energy storage devices in parallel to each other; and during a second discharging condition, electrically coupling the plurality of energy storage devices in series to each other and to the starter to actuate the starter and rotate the engine. | 09-30-2010 |
20100275880 | FUEL DELIVERY SYSTEM DIAGNOSTICS AFTER SHUT-DOWN - A method for operation of a fuel delivery system in an internal combustion engine including a lower pressure pump, a higher pressure pump fluidly coupled downstream of the lower pressure pump, and a fuel rail fluidly coupled downstream of the high pressure pump. The method including initiating a mitigating action based on a fuel rail pressure response, the fuel rail pressure response occurring after an engine shut-down, where the mitigating action includes disabling vehicle operation if fuel rail pressure drops below a threshold value after activation of one of the pumps, the activation occurring before a subsequent engine start, the subsequent engine start occurring after the engine shut-down, and where the mitigating action includes adjusting operation of one of the pumps during the subsequent engine start if fuel rail pressure achieves at least the threshold value after or during the activation. | 11-04-2010 |
20100300404 | DIRECT-START ENGINE OPERATION UTILIZING MULTI-STRIKE IGNITION - A method for operation of a vehicle having an internal combustion engine is provided. The internal combustion engine may include one or more combustion chambers, a fuel delivery system including a direct fuel injector coupled to each combustion chamber, an ignition system including one or more spark plugs coupled to each combustion chamber, a piston disposed within each combustion chamber, and an intake and an exhaust valve coupled to each combustion chamber, the internal combustion engine providing motive power to the vehicle. The method may include discontinuing combustion operation within the internal combustion engine responsive to idle-stop operation. The method may further include, during a direct-start, performing multi-strike ignition operation per combustion cycle via one or more selected spark plug(s) for at least a first combustion cycle in a combustion chamber following the discontinuation of combustion operation, the one or more selected spark plug(s) coupled to the combustion chamber. | 12-02-2010 |
20100300413 | Variable Venturi System and Method for Engine - Systems and methods for an engine are described. In one example, a system may include a variable venturi coupled in an intake of the engine; an exhaust gas recirculation system having an exhaust gas recirculation flow path, the exhaust gas recirculation flow path coupled to the variable venturi; and a vacuum-utilizing device or system coupled to the variable venturi. In another example, a method may include coordinating adjustment of an exhaust gas recirculation valve coupled to the exhaust gas recirculation system, a fuel vapor purging valve coupled to the fuel vapor purging system, and the variable venturi in response to operating conditions. | 12-02-2010 |
20100307454 | Fuel Distribution in Multi-Fuel Tank Compressed Gas Fuel Systems - A method for distributing fuel in a fuel system of a motor vehicle. The method may be applied in a fuel system having a first fuel tank, where fuel is confined at a first pressure, and a second fuel tank, where fuel is confined at a second pressure greater than the first pressure. The method comprises releasing fuel already resident in the second fuel tank to the first fuel tank, and admitting fuel to the first and second fuel tanks simultaneously. | 12-09-2010 |
20110005504 | OXIDANT INJECTION DURING COLD ENGINE START - Various systems and methods are described for controlling an engine with a turbocharger in a vehicle. One example method comprises, under selected operating conditions, generating an oxidant rich component from engine intake air, storing the oxidant rich component of the intake air, and, under subsequent cold start conditions, injecting an amount of the stored oxidant rich component to the engine. | 01-13-2011 |
20110005505 | OXIDANT INJECTION TO REDUCE TURBO LAG - Various systems and methods are described for controlling an engine with a turbocharger in a vehicle. One example method comprises, under selected operating conditions, generating an oxidant rich component from engine intake air, storing the oxidant rich component, and during subsequent increased torque request, injecting an amount of the stored oxidant rich component to the engine. | 01-13-2011 |
20110017174 | ENGINE WITH GASEOUS AND/OR LIQUID FUEL INJECTOR - In one example, a system for a vehicle travelling on a surface is described. The system includes an engine with a cylinder. The cylinder includes a fuel injector that is supplied with gaseous fuel and liquid fuel by a fuel delivery system. The fuel injector is mounted in the vehicle such that the fuel injector inlet faces at least partially toward the road surface. The orientation of the fuel injector enables a quick transition from liquid fuel to gaseous fuel because the gaseous fuel can rise to the injectors and be preferentially injected. Further, various approaches are described from transitioning operation between gaseous and liquid fuel injection. | 01-27-2011 |
20110030658 | POSITIVE-PRESSURE CRANKCASE VENTILATION - A method for combusting a vapor of a fuel accumulated in a crankcase of an engine, the engine disposed in a vehicle having a fuel tank and an adsorbent canister coupled to the fuel tank. The method comprises flowing compressed air from a first air source through the crankcase to yield a crankcase effluent enriched in gasses leaked from the combustion chamber, which include the fuel vapor. The method further comprises combining the crankcase effluent with an effluent from the adsorbent canister, also enriched in the vapor, and, flowing the combined crankcase and adsorbent-canister effluent to an intake of the engine via a conduit. | 02-10-2011 |
20110030659 | BIDIRECTIONAL ADSORBENT-CANISTER PURGING - A method for combusting a vapor of a fuel accumulated in an adsorbent canister in a vehicle, the vehicle having an engine and a fuel tank coupled to the adsorbent canister. The method comprises, during a first operating condition including a higher availability of compressed air, metering the compressed air from a first air source, and flowing the metered, compressed air through the adsorbent canister along a first flow path. The method further comprises, during a second operating condition including a lower availability of compressed air, flowing air from a second air source through the adsorbent canister, and, during the first and second operating conditions, venting the fuel tank to an intake of the engine and flowing effluent enriched in the vapor from the adsorbent canister to the intake of the engine. | 02-10-2011 |
20110041801 | DIRECT-START ENGINE OPERATION UTLIZING MULTI-STRIKE IGNITION - A method for engine starting is provided. The method may include performing idle-stop operation, and during a subsequent re-start, applying multi-strike ignition operation for a first combustion cycle. In this way, improved engine starting may be achieved with reduced emissions. | 02-24-2011 |
20110120432 | Variable Venturi System and Method for Engine - Systems and methods for an engine are described. In one example, a system may include a variable venturi coupled in an intake of the engine; an exhaust gas recirculation system having an exhaust gas recirculation flow path, the exhaust gas recirculation flow path coupled to the variable venturi; and a vacuum-utilizing device or system coupled to the variable venturi. In another example, a method may include coordinating adjustment of an exhaust gas recirculation valve coupled to the exhaust gas recirculation system, a fuel vapor purging valve coupled to the fuel vapor purging system, and the variable venturi in response to operating conditions. | 05-26-2011 |
20110132290 | METHOD FOR OPERATING A VEHICLE WITH A FUEL REFORMER - A method for operating an engine with a fuel reformer is presented. In one embodiment a method for operating an engine by injecting a gaseous fuel and a liquid fuel to at least an engine cylinder is presented. The method may prioritize the injection of the gaseous fuel in response to an amount of gaseous fuel stored in a fuel storage tank. | 06-09-2011 |
20110132291 | AUXILIARY PUMP SCHEME FOR A COOLING SYSTEM IN A HYBRID-ELECTRIC VEHICLE - Various systems and methods are described for a cooling system coupled to an engine in a vehicle. One example method comprises, during engine off, operating an auxiliary pump to flow coolant through a heater core; and, during engine running, operating an engine pump to flow coolant through the heater core and radiator, and selectively operating the auxiliary pump to assist flow through the heater core based on operating conditions. | 06-09-2011 |
20110132307 | METHOD FOR STARTING AN ENGINE - A method for improving starting of an engine that may be repeatedly stopped and started is presented. In one embodiment, the method disengages a starter in response to a first predicted combustion in a cylinder of the engine. The method may reduce one-way clutch degradation of a starter. Further, the method may reduce current consumption during engine starting. | 06-09-2011 |
20110132308 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Methods and systems are provided for controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions. One example method includes, during a first condition, engaging an engine starter, without applying a starter current, to the deactivated rotating engine after the engine speed drops below a threshold speed. The method further includes, during a second condition, engaging the starter and adjusting a starter motor switch to apply a starter braking torque to the rotating engine. | 06-09-2011 |
20110132311 | INTAKE SYSTEM INCLUDING VACUUM ASPIRATOR - In some examples, reduced engine displacement reduces an engine's ability to provide brake booster vacuum. The present application relates to intake systems including a vacuum aspirator to generate vacuum. | 06-09-2011 |
20110132320 | FLUID INJECTION PRESSURIZATION SYSTEM - A system including, an internal combustion engine including a combustion chamber, a first injector to provide a first injection fluid to the combustion chamber, and a heated pressurization system to heat the first injection fluid in a pressure vessel to achieve a sufficient injection pressure. | 06-09-2011 |
20110135498 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Methods and systems are provided for pressurizing a transmission hydraulic circuit including a transmission mechanical pump coupled to an engine though a gearbox. One example method comprises, during an engine start, adjusting a speed ratio between the transmission pump and the engine between a first speed ratio and a second speed ratio, the pump rotating faster relative to the engine at the first speed ratio as compared with the second speed ratio. | 06-09-2011 |
20110136620 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Methods and systems are provided for controlling a vehicle engine coupled to a stepped-gear-ratio transmission. One example method comprises, in response to a first vehicle moving condition, shutting down the engine and at least partially disengaging the transmission while the vehicle is moving; and during a subsequent restart, while the vehicle is moving, starting the engine using starter motor assistance and adjusting a degree of engagement of a transmission clutch to adjust a torque transmitted to a wheel of the vehicle. | 06-09-2011 |
20110137543 | METHOD FOR STARTING AN ENGINE - A method for improving starting of an engine that may be repeatedly stopped and started is presented. In one embodiment, the method controls a transition from split fuel injection timing during an engine start to single event fuel injection during idle speed or engine torque control modes. The method better manages vehicle launch performance when the engine is restarted while coupled to an automatic transmission that is in gear. | 06-09-2011 |
20110138807 | EXHAUST HEAT RECOVERY FOR ENGINE HEATING AND EXHAUST COOLING - Various systems and method for heating an engine in a vehicle are described. In one example, intake air flowing in a first direction may be heated via a gas-to-gas heat exchange with exhaust gases. The heated intake air may then be used in a subsequent gas-to-liquid heat exchange to heat a fluid circulating through the engine. In another example, intake air flowing in a second direction may be heated via a heat exchange with exhaust gases in order to cool an exhaust catalyst. | 06-16-2011 |
20110167815 | METHOD AND SYSTEM FOR TURBOCHARGING AN ENGINE - A method for improving operation of a turbocharged engine is presented. In one embodiment, the method may reduce engine emissions and improve engine efficiency during an engine start. | 07-14-2011 |
20110168133 | APPROACH FOR CONTROLLING FUEL FLOW WITH ALTERNATIVE FUELS - Fuel is evacuated from a fuel rail by directing liquid fuel from the fuel rail to a fuel tank and then by directing gaseous fuel from the fuel rail to a fuel vapor canister. | 07-14-2011 |
20110172890 | TRANSMISSION FLUID HEATING VIA HEAT EXCHANGE WITH ENGINE CYLINDER WALLS - Various systems and method are provided for heating transmission fluid by directing the transmission fluid through a cylinder block of an engine. In one example, the transmission fluid is directed to flow through the cylinder block of the engine while engine coolant is directed to flow through the cylinder head of the engine. Further, the transmission fluid may be directed through one or more heat exchangers to cool the transmission fluid. | 07-14-2011 |
20110192374 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Methods and systems are provided for expediting engine spin-down in an engine that is shutdown during engine idle-stop conditions and restarted during restart conditions. In one example, the method comprises, during an automatic engine idle-stop, turning off spark, operating a first cylinder with a rich ratio of air to injected fuel richer than a rich flammability limit, operating a second cylinder with a lean ratio of air to injected fuel leaner than a lean flammability limit, and mixing un-combusted exhaust from the first and second cylinders with exhaust, the exhaust mixture being substantially stoichiometric. | 08-11-2011 |
20110202262 | METHOD FOR STARTING AN ENGINE - A method for improving starting of an engine that may be repeatedly stopped and started is presented. In one embodiment, the method skips combustion in at least one cylinder, according to the engine combustion order, to control engine speed when an engine is automatically restarted. The skipped combustion event may be related to a level of IMEP when combustion in a cylinder occurs under an operating condition. | 08-18-2011 |
20110209690 | Method and System for Providing Air to an Engine - Systems and methods for supplying air to an engine are disclosed. In one example, an air inlet throttle is at least partially closed in response to a change in engine torque request. In another example, the air inlet throttle is adjusted in conjunction with adjusting an engine throttle. The approach can reduce compressor noise and may reduce the possibility of compressor surge. | 09-01-2011 |
20110232596 | METHOD FOR STARTING AN ENGINE - A method for improving starting of an engine that may be repeatedly stopped and started is presented. In one embodiment, the method disengages a starter in response to a first predicted combustion in a cylinder of the engine. The method may reduce one-way clutch degradation of a starter. Further, the method may reduce current consumption during engine starting. | 09-29-2011 |
20110239997 | COMBUSTION STABILITY ENHANCEMENT VIA INTERNAL EGR CONTROL - A method for controlling combustion in a cylinder of a turbocharged engine in which intake air is reserved upstream of the cylinder. The method comprises decreasing an internal EGR rate in the cylinder during a tip-out condition if the temperature of the intake air is above a threshold, and increasing the internal EGR rate in the cylinder during a tip-out condition if the temperature of the intake air is below the threshold. | 10-06-2011 |
20110251019 | METHOD AND SYSTEM FOR CABIN HEATING - Methods and systems are provided for selectively increasing an amount of waste heat generated by an idling engine. An engine output is increased while a transmission output is locked to generate waste heat that may be used to heat the cabin of a stopped vehicle. | 10-13-2011 |
20110253098 | Stored Compressed Air Management and Flow Control for Improved Engine Performance - A method for providing air to a combustion chamber of an engine, the engine including a compressor and a boost tank selectably coupled to an intake manifold. The method comprises admitting air from the compressor to the intake manifold via a main throttle valve, storing some air from the compressor in a boost tank, and discharging some of the air stored in the boost tank to the intake manifold via an auxiliary throttle valve distinct from the main throttle valve. | 10-20-2011 |
20120023933 | METHOD AND SYSTEM FOR A TURBOCHARGED ENGINE - Methods and systems are provided for a boosted engine having a split intake system coupled to a split exhaust system. Aircharges of differing composition, pressure, and temperature may be delivered to the engine through the split intake system at different points of an engine cycle. In this way, boost and EGR benefits may be extended. | 02-02-2012 |
20120023934 | METHOD AND SYSTEM FOR A TURBOCHARGED ENGINE - Methods and systems are provided for a boosted engine having a split intake system coupled to a split exhaust system. Aircharges of differing composition, pressure, and temperature may be delivered to the engine through the split intake system at different points of an engine cycle. In this way, boost and EGR benefits may be extended. | 02-02-2012 |
20120023935 | METHOD AND SYSTEM FOR A TURBOCHARGED ENGINE - Methods and systems are provided for a boosted engine having a split intake system coupled to a split exhaust system. Aircharges of differing composition, pressure, and temperature may be delivered to the engine through the split intake system at different points of an engine cycle. In this way, boost and EGR benefits may be extended. | 02-02-2012 |
20120024259 | DIRECT-START ENGINE OPERATION UTILIZING MULTI-STRIKE IGNITION - A method for engine starting is provided. The method may include performing idle-stop operation, and during a subsequent re-start, applying multi-strike ignition operation for a first combustion cycle. In this way, improved engine starting may be achieved with reduced emissions. | 02-02-2012 |
20120024261 | VACUUM SYSTEM FOR AN ENGINE - Systems and methods for generating a vacuum in an engine are provided. The system includes a first throttle upstream from a plurality of cylinders and a second throttle upstream from one of the cylinders. The system further includes a vacuum reservoir in fluidic communication with an intake runner downstream from the second throttle; a vacuum consumer in fluidic communication with the vacuum reservoir, the vacuum consumer controlled by an actuator; and a pneumatic actuator driven by a pressure state of the vacuum reservoir to adjust the second throttle. | 02-02-2012 |
20120024269 | FUEL BASED ENGINE OPERATION CONTROL - Methods are provided for operating an engine with a variable fuel blend in a cylinder, where the variable fuel blend varies a peak achievable engine torque for a given operating condition. One example method comprises selectively operating an engine actuator that affects engine torque and engine fuel economy at the given operating condition, and extending operation of the actuator to higher engine torques as a peak engine torque for the given operating condition increases. | 02-02-2012 |
20120029749 | TURBOCHARGER LAUNCH CONTROL - A method for launching a vehicle is disclosed. The method comprises increasing alternator and boost pressure while maintaining idle speed at idle before pedal tip-in, and decreasing alternator load responsive to pedal tip-in. In this way, increased turbocharger output may be used to quickly accelerate the vehicle. | 02-02-2012 |
20120029795 | METHOD AND SYSTEM FOR CONTROLLING FUEL USAGE - Methods and systems are provided for improving fuel usage while addressing knock by adjusting the use of spark retard and direct injection of a fluid based on engine operating conditions and the composition of the injected fluid. One or more engine parameters, such as EGR, VCT, boost, throttle position, are coordinated with the direct injection to reduce torque and EGR transients. | 02-02-2012 |
20120060492 | METHOD AND SYSTEM ADJUSTING AN EXHAUST HEAT RECOVERY VALVE - A method for adjusting an exhaust heat recovery valve is presented. In one embodiment, the method may control an amount of boost provided by a turbocharger to an engine. | 03-15-2012 |
20120073288 | METHOD AND SYSTEM FOR TURBOCHARGING AN ENGINE - A method for improving operation of a turbocharged engine is presented. In one embodiment, the method may reduce engine emissions and improve engine efficiency during an engine start. | 03-29-2012 |
20120090574 | HIGH PRESSURE FUEL PUMP CONTROL FOR IDLE TICK REDUCTION - A method for controlling a mechanical solenoid valve of a high-pressure fuel pump to supply fuel to an engine is provided. In one example, current supplied to the mechanical solenoid valve is adjusted according to a pressure downstream of the fuel pump. The method can reduce current used to operate the mechanical solenoid valve as well as pump noise, at least during some conditions. | 04-19-2012 |
20120110995 | EXHAUST HEAT RECOVERY FOR ENGINE HEATING AND EXHAUST COOLING - Various systems and method for heating an engine in a vehicle are described. In one example, intake air flowing in a first direction may be heated via a gas-to-gas heat exchange with exhaust gases. The heated intake air may then be used in a subsequent gas-to-liquid heat exchange to heat a fluid circulating through the engine. In another example, intake air flowing in a second direction may be heated via a heat exchange with exhaust gases in order to cool an exhaust catalyst. | 05-10-2012 |
20120138010 | OIL DELIVERY SYSTEM - Systems and methods for delivering oil to an engine are provided herein. According to one embodiment, the oil delivery system includes an oil supply, a feeder passage fluidically coupled to the oil supply and a cylinder head, the feeder passage coupled to a pump and a filter positioned downstream from the pump. The oil delivery system further includes a squirter passage in fluidic communication with a plurality of piston squirters and the feeder passage at a position between the pump and the filter. In this way, less-filtered oil is selectively routed through a cooling circuit to reduce engine warm-up time. | 06-07-2012 |
20120174897 | BIDIRECTIONAL ADSORBENT-CANISTER PURGING - A method for combusting a vapor of a fuel accumulated in an adsorbent canister in a vehicle, the vehicle having an engine and a fuel tank coupled to the adsorbent canister. The method comprises, during a first operating condition including a higher availability of compressed air, metering the compressed air from a first air source, and flowing the metered, compressed air through the adsorbent canister along a first flow path. The method further comprises, during a second operating condition including a lower availability of compressed air, flowing air from a second air source through the adsorbent canister, and, during the first and second operating conditions, venting the fuel tank to an intake of the engine and flowing effluent enriched in the vapor from the adsorbent canister to the intake of the engine. | 07-12-2012 |
20120185158 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Methods and systems are provided for controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions. One example method includes, during a first condition, engaging an engine starter, without applying a starter current, to the deactivated rotating engine after the engine speed drops below a threshold speed. The method further includes, during a second condition, engaging the starter and adjusting a starter motor switch to apply a starter braking torque to the rotating engine. | 07-19-2012 |
20120192836 | FUEL PREHEAT FOR ENGINE START - Systems and methods for providing heated fuel to a fuel injector of an engine are provided. According to the approaches described herein, adequate cold-start fuel atomization may be provided without compromising driver satisfaction due to excessive pre-ignition delay, while at the same time reducing unnecessary heating of fuel during warm engine off conditions. | 08-02-2012 |
20120200262 | METHODS AND SYSTEMS FOR ENGINE START CONTROL - Methods and systems are provided for starting an engine in a vehicle. In one example, two or more energy storage devices are coupled in series to improve engine starting. The method and system may reduce engine starting time. | 08-09-2012 |
20120208674 | METHOD AND SYSTEM FOR ENGINE CONTROL - Methods and systems are provided for controlling an engine system with a variable cam timing device. In one example, the variable cam timing device is operated to adjust engine valve timing differently at engine stop based on whether the engine stop is in response to an operator request or in response to an automatic controller initiated engine stop without an operator request. | 08-16-2012 |
20120210981 | ENGINE WITH GASEOUS AND/OR LIQUID FUEL INJECTOR - In one example, a system for a vehicle travelling on a surface is described. The system includes an engine with a cylinder. The cylinder includes a fuel injector that is supplied with gaseous fuel and liquid fuel by a fuel delivery system. The fuel injector is mounted in the vehicle such that the fuel injector inlet faces at least partially toward the road surface. The orientation of the fuel injector enables a quick transition from liquid fuel to gaseous fuel because the gaseous fuel can rise to the injectors and be preferentially injected. Further, various approaches are described from transitioning operation between gaseous and liquid fuel injection. | 08-23-2012 |
20120216767 | VEHICLE FUEL BURNER - A method is provided. The method includes, during stopped engine operation, burning fuel in an engine intake heater to generate heated gas, the heated gas bypassing engine cylinders via an exhaust gas recirculation passage. The method further includes during combusting engine operation, burning fuel in the engine intake heater to generate heated gas, and flowing the heated gas through combusting engine cylinders. | 08-30-2012 |
20120237365 | METHOD AND SYSTEM FOR OPERATING AN EJECTOR - A selectively operable vacuum source is disclosed. In one example, vacuum source supplies as much air to an engine as is drawn by the vacuum source from a vacuum reservoir. The approach may provide vacuum to a vehicle vacuum system efficiently and with less weight than other vacuum sources. | 09-20-2012 |
20120237368 | Method and System for Providing Vacuum via Excess Boost - A vacuum source including an ejector is disclosed. In one example, vacuum is supplied via the ejector when a turbocharger has excess boost capacity. The approach can prioritize how excess boost may be used to provide vacuum. | 09-20-2012 |
20120238405 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Methods and systems are provided for controlling a vehicle engine coupled to a stepped-gear-ratio transmission. One example method comprises, in response to a first vehicle moving condition, shutting down the engine and at least partially disengaging the transmission while the vehicle is moving; and during a subsequent restart, while the vehicle is moving, starting the engine using starter motor assistance and adjusting a degree of engagement of a transmission clutch to adjust a torque transmitted to a wheel of the vehicle. | 09-20-2012 |
20120239277 | FUEL BASED ENGINE OPERATION CONTROL - Methods are provided for operating an engine with a variable fuel blend in a cylinder, where the variable fuel blend varies a peak achievable engine torque for a given operating condition. One example method comprises selectively operating an engine actuator that affects engine torque and engine fuel economy at the given operating condition, and extending operation of the actuator to higher engine torques as a peak engine torque for the given operating condition increases. | 09-20-2012 |
20120245831 | METHOD FOR STARTING AN ENGINE - A method for improving starting of an engine that may be repeatedly stopped and started is presented. In one embodiment, the method disengages a starter in response to a first predicted combustion in a cylinder of the engine. The method may reduce one-way clutch degradation of a starter. Further, the method may reduce current consumption during engine starting. | 09-27-2012 |
20120247101 | Method and System for Providing Air to an Engine - Systems and methods for supplying air to an engine are disclosed. In one example, an air inlet throttle is at least partially closed in response to a change in engine torque request. In another example, the air inlet throttle is adjusted in conjunction with adjusting an engine throttle. The approach can reduce compressor noise and may reduce the possibility of compressor surge. | 10-04-2012 |
20120264567 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Methods and systems are provided for pressurizing a transmission hydraulic circuit including a transmission mechanical pump coupled to an engine though a gearbox. One example method comprises, during an engine start, adjusting a speed ratio between the transmission pump and the engine between a first speed ratio and a second speed ratio, the pump rotating faster relative to the engine at the first speed ratio as compared with the second speed ratio. In this way, the pump may be driven at different speed ratios relative to the engine to provide better pressurization in the transmission. | 10-18-2012 |
20120291432 | Method and System for Controlling a Turbocharger Compressor Bypass - A turbocharger compressor bypass valve is disclosed. In one example, the compressor bypass valve operates inversely proportional to engine throttle operation. The approach may simplify compressor bypass valve control and reduced engine system complexity. | 11-22-2012 |
20130000570 | METHOD FOR OPERATING A VEHICLE WITH A FUEL REFORMER - A method for operating an engine with a fuel reformer is presented. In one embodiment a method for operating an engine by injecting a gaseous fuel and a liquid fuel to at least an engine cylinder is presented. The method may prioritize the injection of the gaseous fuel in response to an amount of gaseous fuel stored in a fuel storage tank. | 01-03-2013 |
20130000601 | ENGINE-LOAD MANAGEMENT TO REDUCE PARTICULATE EMISSIONS - A method for operating an engine of a vehicle. During a warm-up period following a cold start of the vehicle, a cylinder of the engine is charged to a reduced air-charge pressure, and fuel is injected into the cylinder. After the warm-up period, the cylinder is charged to a non-reduced air-charge pressure, greater for an equivalent driver demand than the reduced air-charge pressure, and fuel is injected into the cylinder. | 01-03-2013 |
20130066535 | METHOD AND SYSTEM FOR SAMPLING INTAKE MANIFOLD PRESSURE - An engine system and method for improving sampling of a port throttle pressure sensor. In one example, the port throttle pressure sensor is sampled a plurality of times during a cylinder cycle and different engine operating conditions are determined from selected samples. The system and method may improve engine air-fuel control as well as engine diagnostics. | 03-14-2013 |
20130074589 | FUEL VAPOR PURGING DIAGNOSTICS - Systems and methods are provided for monitoring reverse flow of fuel vapors and/or air through a vehicle fuel vapor recovery system, the fuel vapor recovery system coupled to an engine intake of a boosted internal combustion engine. One example method comprises, intermittently adjusting a restriction in the fuel vapor recovery system during boosted conditions, and indicating degradation based on one or more of a change in a pressure value, or based on a change in flow in the fuel vapor recovery system. | 03-28-2013 |
20130103286 | SYSTEM AND METHOD FOR SUPPLYING FUEL TO AN ENGINE VIA MULTIPLE FUEL PATHS - A system and method for supplying fuel to an engine is disclosed. In one example, a first controller supplies injector commands to a second controller via an asynchronous serial communication bus. The system may reduce the complexity of supplying two or more fuels to an engine. | 04-25-2013 |
20130125847 | VARIABLE CAM CONTROL IN AN ENGINE - A method for controlling variable camshaft timing is provided. In one example, an engine method comprises adjusting a variable cam actuator responsive to cam position feedback from even and uneven readings of a cam sensor. In this way, increased cam position feedback may be provided to improve cam positioning control. | 05-23-2013 |
20130125858 | FLUID INJECTION PRESSURIZATION SYSTEM - A system including, an internal combustion engine including a combustion chamber, a first injector to provide a first injection fluid to the combustion chamber, and a heated pressurization system to heat the first injection fluid in a pressure vessel to achieve a sufficient injection pressure. By heating the injection fluid in a pressure vessel, pressure in the vessel can be increased to a specified injection pressure. | 05-23-2013 |
20130139776 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Method and systems are provided for controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions. One example method comprises, adjusting a brake torque applied to a deactivated rotating engine after an engine restart request, the brake torque applied to slow the engine to at least a predetermined threshold speed without stopping the engine, and engaging a starter to the still rotating engine to increase the engine speed and restart the engine. | 06-06-2013 |
20130146023 | TURBOCHARGER LAUNCH CONTROL - A method for launching a vehicle is disclosed. The method comprises, during operation with an idle engine speed prior to a pedal tip-in, increasing alternator and boost pressure while maintaining the idle engine speed, and decreasing alternator load responsive to the pedal tip-in. In this way, increased turbocharger output may be used to quickly accelerate the vehicle. | 06-13-2013 |
20130146036 | Stored Compressed Air Management and Flow Control for Improved Engine Performance - A method for providing air to a combustion chamber of an engine, the engine including a compressor and a boost tank selectably coupled to an intake manifold. The method comprises admitting air from the compressor to the intake manifold via a main throttle valve, storing some air from the compressor in a boost tank, and discharging some of the air stored in the boost tank to the intake manifold via an auxiliary throttle valve distinct from the main throttle valve. | 06-13-2013 |
20130152903 | METHOD AND SYSTEM FOR IMPROVING ENGINE STARTING - An engine system and method for improving engine starting are disclosed. In one example, engine port throttles are adjusted to improve fuel vaporization of a fuel that includes alcohol. The system and method may improve engine starting and emissions. | 06-20-2013 |
20130217540 | METHOD AND SYSTEM FOR CABIN HEATING - Methods and systems are provided for selectively increasing an amount of waste heat generated by an idling engine. An engine output is increased while a transmission output is locked to generate waste heat that may be used to heat the cabin of a stopped vehicle. | 08-22-2013 |
20130233276 | THROTTLE VALVE SYSTEM FOR AN ENGINE - An embodiment of an engine is described. The engine includes a first throttle valve. The first throttle valve is provided in a first intake passage coupled to an intake manifold. The first throttle valve has a default closed position. The engine further includes a second throttle valve. The second throttle valve is provided in a second intake passage coupled to the intake manifold. The second throttle valve has a default open position. The engine further includes a venturi pump that is provided between the second throttle valve and the intake manifold. When the second throttle valve is in the default open position, intake air flows through the venturi pump. | 09-12-2013 |
20130247873 | FUEL DISTRIBUTION IN MULTI-FUEL TANK COMPRESSED GAS FUEL SYSTEMS - A method for distributing fuel in a fuel system of a motor vehicle. The method may be applied in a fuel system having a first fuel tank, where fuel is confined at a first pressure, and a second fuel tank, where fuel is confined at a second pressure greater than the first pressure. The method comprises releasing fuel already resident in the second fuel tank to the first fuel tank, and admitting fuel to the first and second fuel tanks simultaneously. | 09-26-2013 |
20130255646 | SYSTEM AND METHOD FOR EMPTYING A TANK - A system for method for emptying a gas storage tank of a vehicle is presented. In one example, engine valve timing is adjusted to facilitate reducing pressure within the gas storage tank. The system and method may extend the use of the gas stored in the gas storage tank. | 10-03-2013 |
20130283789 | METHOD AND SYSTEM FOR A TURBOCHARGED ENGINE - Methods and systems are provided for a boosted engine having a split intake system coupled to a split exhaust system. Aircharges of differing composition, pressure, and temperature may be delivered to the engine through the split intake system at different points of an engine cycle. In this way, boost and EGR benefits may be extended. | 10-31-2013 |
20130284145 | METHOD AND SYSTEM FOR CONTROLLING FUEL USAGE - Methods and systems are provided for improving fuel usage while addressing knock by adjusting the use of spark retard and direct injection of a fluid based on engine operating conditions and the composition of the injected fluid. One or more engine parameters, such as EGR, VCT, boost, throttle position, are coordinated with the direct injection to reduce torque and EGR transients. | 10-31-2013 |
20130311058 | CHARGE WHILE BEING FLAT TOWED FEATURE FOR ELECTRIC VEHICLES - A towed vehicle is towed by a towing vehicle. The towed vehicle includes a motor/generator for both regenerative braking and for powering wheels. A tow member connects the towed vehicle to the towed vehicle. A sensor measures or infers the tension and compression in the tow member. A computer communicates with the sensor and with the motor/generator. The computer commands the motor/generator to either utilize regenerative braking or provide assistance in propulsion of the towed vehicle based upon the tension and compression forces in the tow member. | 11-21-2013 |
20130318966 | METHOD AND SYSTEM FOR ADJUSTING ENGINE THROTTLES - An engine system and method for operating an engine including a central throttle and a port throttle is disclosed. In one example, the central throttle and port throttle are adjusted to improve air flow distribution to engine cylinders. The system and method may be particularly beneficial for turbocharged engines. | 12-05-2013 |
20130340732 | CRANKCASE VENTILATION AND VACUUM GENERATION - Methods and systems are provided for generating vacuum from crankcase ventilation flow. During both directions of gas flow between an engine intake manifold and a crankcase, gases are directed through one or more aspirators to produce vacuum. The drawn vacuum may then be used to operate various engine vacuum actuators. | 12-26-2013 |
20140041362 | METHOD AND SYSTEM FOR REGENERATING A PARTICULATE FILTER - An engine system and method for operating an engine that includes a particulate filter is described. In one example, spark delivery to one or more engine cylinders is ceased while fuel is continued to be injected to the one or more cylinders to improve particulate filter regeneration. The system and method may be particularly beneficial for direct injection turbocharged engines. | 02-13-2014 |
20140053551 | METHOD AND SYSTEM ADJUSTING AN EXHAUST HEAT RECOVERY VALVE - A method for adjusting an exhaust heat recovery valve is presented. In one embodiment, the method may control an amount of boost provided by a turbocharger to an engine. | 02-27-2014 |
20140057754 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Methods and systems are provided for controlling a vehicle engine coupled to a stepped-gear-ratio transmission. One example method comprises, in response to a first vehicle moving condition, shutting down the engine and at least partially disengaging the transmission while the vehicle is moving; and during a subsequent restart, while the vehicle is moving, starting the engine using starter motor assistance and adjusting a degree of engagement of a transmission clutch to adjust a torque transmitted to a wheel of the vehicle. | 02-27-2014 |
20140076294 | CRANKCASE VENTILATION VIA CRANKCASE PULSATION - Systems and methods for ventilating crankcase gases in a crankcase ventilation system via crankcase pressure pulsations are disclosed. In one example approach, a method comprises driving flow of crankcase ventilation gases through a crankcase of the engine from a fresh air inlet of the crankcase to an outlet of the crankcase via crankcase pressure pulsations while restricting backflow of crankcase ventilation gases from the outlet to the inlet, where the inlet and outlet are coupled upstream of an intake throttle of the engine. | 03-20-2014 |
20140116399 | METHOD AND SYSTEM FOR FUEL VAPOR MANAGEMENT - Methods and systems are provided for shared handling of fuel vapor purge and crankcase ventilation in an engine system. Fuel vapors from each of a canister and a crankcase are drawn into an intake manifold in a common direction during both boosted and non-boosted engine operating conditions using vacuum drawn at various aspirators. Compressor bypass flow through a first aspirator is used to enhance vacuum produced during boosted conditions while throttle bypass flow through a second aspirator is used to enhance vacuum produced during non-boosted conditions. | 05-01-2014 |
20140123941 | METHOD AND SYSTEM FOR VACUUM GENERATION - Methods and systems are provided for improving the vacuum generation efficiency of an ejector coupled to in an engine system. Vacuum is generated at the ejector at a faster rate but to a lower level by opening a throttle upstream of the ejector. Vacuum is then raised to a higher level but at a slower rate by closing the throttle upstream of the ejector. | 05-08-2014 |
20140137553 | VACUUM-ACTUATED WASTEGATE - Embodiments for vacuum generation are provided. In one example, a method for an engine including a turbocharger having a compressor driven by a turbine comprises generating vacuum via exhaust flow through an ejector, and applying vacuum from the ejector to a wastegate actuator. In this way, vacuum produced via high-pressure exhaust resulting from boosted engine operation may be used to actuate the wastegate valve. | 05-22-2014 |
20140138562 | VACUUM-ACTUATED WASTEGATE - Embodiments for vacuum generation are provided. In one example, a method comprises when boost is below a threshold, generating vacuum with an actuator in a first position by flowing air from a compressor outlet to an intake manifold through a first ejector, and when boost is above the threshold, generating vacuum with the actuator in a second position by flowing air from the compressor outlet to a compressor inlet through a second ejector. In this way, vacuum may be generated by more than one ejector via actuation of a common actuator. | 05-22-2014 |
20140144408 | METHODS AND SYSTEMS FOR ASSISTED DIRECT START CONTROL - Method and systems are provided for controlling a vehicle system including an engine that is selectively deactivated during engine idle-stop conditions. One example method comprises, adjusting a brake torque applied to a deactivated rotating engine after an engine restart request, the brake torque applied to slow the engine to at least a predetermined threshold speed without stopping the engine, and engaging a starter to the still rotating engine to increase the engine speed and restart the engine. | 05-29-2014 |
20140157775 | EXHAUST HEAT RECOVERY FOR ENGINE HEATING AND EXHAUST COOLING - Various systems and method for heating an engine in a vehicle are described. In one example, intake air flowing in a first direction may be heated via a gas-to-gas heat exchange with exhaust gases. The heated intake air may then be used in a subsequent gas-to-liquid heat exchange to heat a fluid circulating through the engine. In another example, intake air flowing in a second direction may be heated via a heat exchange with exhaust gases in order to cool an exhaust catalyst. | 06-12-2014 |
20140165536 | EJECTOR IN CONJUNCTION WITH POST-CATALYST EXHAUST THROTTLE FOR VACUUM GENERATION - Methods and systems are provided for expediting catalyst heating and generating vacuum by controlling an EBV to direct exhaust through an ejector arranged in parallel with the EBV. A position of the EBV may be controlled to achieve a desired exhaust backpressure for current engine operating conditions and stored vacuum level. Compensation for the effect of EBV position on engine airflow may be provided by adjustment of other parameters such as intake throttle position and spark timing. | 06-19-2014 |
20140196454 | METHOD AND SYSTEM FOR CATALYST TEMPERATURE CONTROL - Methods and systems are provided for controlling and coordinating control of a post-catalyst exhaust throttle and an EGR valve to expedite catalyst heating. By closing both valves during an engine cold start, an elevated exhaust backpressure and increased heat rejection at an EGR cooler can be synergistically used to warm each of an engine and an exhaust catalyst. The valves may also be controlled to vary an amount of exhaust flowing through an exhaust venturi so as to meet engine vacuum needs while providing a desired amount of engine EGR. | 07-17-2014 |
20140196699 | METHOD AND SYSTEM FOR VACUUM CONTROL - Methods and systems are provided for controlling and coordinating control of a post-catalyst exhaust throttle and an EGR valve to expedite catalyst heating. By closing both valves during an engine cold start, an elevated exhaust backpressure and increased heat rejection at an EGR cooler can be synergistically used to warm each of an engine and an exhaust catalyst. The valves may also be controlled to vary an amount of exhaust flowing through an exhaust venturi so as to meet engine vacuum needs while providing a desired amount of engine EGR. | 07-17-2014 |
20140196703 | DEVICES AND METHODS FOR EXHAUST GAS RECIRCULATION OPERATION OF AN ENGINE - An engine is provided that includes an exhaust gas recirculation (EGR) conduit in fluidic communication with a first exhaust valve in a cylinder and an intake system, an exhaust conduit in fluidic communication with a second exhaust valve in the cylinder and an emission control device. During operation with the first valve active and the second valve deactivated, a fixed EGR level can be provided. However, during operation with the first valve deactivated and the second valve active, increased engine output can be achieved with reduced EGR without requiring additional exhaust throttling or switching valves. | 07-17-2014 |
20140202434 | LIQUID INJECTION FOR SCAVENGING - Methods are provided for controlling an engine. One method may include boosting engine intake air to a cylinder; and injecting an amount of a scavenging fluid into the cylinder based on an amount of cylinder residual exhaust gas. A scavenging fluid, such as water or windshield washer fluid evaporates on contact with the hot exhaust gases and hot metal components and the expanded volume of the vapor displaces the residual exhaust gas, thereby improving engine scavenging. | 07-24-2014 |
20140251240 | SYSTEM AND METHOD FOR COOLING ENGINE PISTONS - An engine cooling system and method for operating the engine cooling system is disclosed. In one example, engine oil is sprayed on to a piston via piston cooling jets. The approach judges whether or not to operate the piston cooling jets based on a benefit assessment. | 09-11-2014 |
20140283799 | METHOD AND SYSTEM FOR TURBOCHARGING AN ENGINE - A method for improving operation of a turbocharged engine is presented. In one embodiment, the method may reduce engine emissions and improve engine efficiency during an engine start. | 09-25-2014 |
20140311443 | ENGINE CONTROL FOR CATALYST REGENERATION - Methods and systems are provided for injecting water during an engine cylinder deactivation event so as to reduce an exhaust catalyst regeneration requirement following the cylinder deactivation. In one example, water is injected at one or more deactivated engine cylinders to reduce oxidation of the exhaust catalyst. Then, during engine cylinder reactivation, a degree of richness of a combustion air-to-fuel ratio may be reduced to decrease fuel penalty to the engine while reducing NOx emission. | 10-23-2014 |
20140318498 | SYSTEM AND METHOD FOR INJECTOR COKING DIAGNOSTICS AND MITIGATION - A system and method for compensating for, or alleviating accumulation of, coking residues on fuel injectors is disclosed. The method includes adjusting an engine operating parameter based on a shift in a fuel injector current profile during an initial current rise of injector activation. | 10-30-2014 |
20140318508 | METHODS AND SYSTEMS FOR TURBOCHARGER CONTROL - Methods are provided for controlling a turbocharged engine having an additional throttle located between an intake manifold of the engine and an outlet of a compressor. In one example approach a method comprises, during a cold start condition, diverting a portion of compressed air from downstream a compressor to a heat exchanger, and heating vehicle components with the heat exchanger. | 10-30-2014 |
20140360461 | DEDICATED EGR CYLINDER POST COMBUSTION INJECTION - Systems and methods for increasing an amount of fuel injected into a dedicated exhaust gas recirculation (EGR) cylinder in an engine are disclosed. In one example approach, a method comprises, prior to combustion, injecting a first amount of fuel to a dedicated EGR cylinder, and after combustion and during an expansion and/or exhaust stroke, directly injecting a second amount of fuel to the dedicated EGR cylinder. | 12-11-2014 |
20140366508 | WATER INJECTION FOR CATALYST OXYGEN REDUCTION AND TEMPERATURE CONTROL DURING TRANSIENT EVENTS - Methods and systems are provided for injecting water based on duration of cylinder deactivation, and exhaust catalyst temperature during an engine cylinder deactivation event so as to reduce an exhaust catalyst regeneration requirement following the cylinder deactivation, and to prevent catalyst degradation. | 12-18-2014 |
20140373820 | METHOD AND SYSTEM ADJUSTING AN EXHAUST HEAT RECOVERY VALVE - A method for adjusting an exhaust heat recovery valve is presented. In one embodiment, the method may control an amount of boost provided by a turbocharger to an engine. | 12-25-2014 |
20140377059 | INTRODUCTION OF EXHAUST GAS RECIRCULATION AT A COMPRESSOR BLADE TRAILING EDGE - Methods and systems are provided for injecting exhaust gases from an exhaust gas recirculation system proximate to a trailing edge of a compressor wheel of a compressor. In one example, a compressor of a turbocharger may include an exhaust gas recirculation inlet volute within a casting of the compressor. The exhaust gas recirculation inlet volute may include an injection port positioned downstream of the trailing edge of the compressor wheel for injecting exhaust gases into intake air flow. | 12-25-2014 |
20150047317 | METHODS AND SYSTEMS FOR EGR CONTROL - Methods and systems are provided for using compressor recirculation flow via a venturi to enhance low pressure EGR flow. The opening of a compressor recirculation valve can be adjusted based on EGR flow demand to recirculate cooled compressed air through a venturi while generating vacuum for drawing EGR. The approach allows for concurrent EGR control and surge control. | 02-19-2015 |
20150047340 | METHODS AND SYSTEMS FOR CONDENSATION CONTROL - Methods and systems are provided for reducing condensate accumulation at a charge air cooler (CAC) during cold ambient conditions. A wastegate may be held closed while a compressor recirculation valve is held open during an engine cold start so as to use compressor heating and increased compressor recirculation to expedite CAC heating. EGR delivery is delayed until the CAC is sufficiently warm to reduce the propensity for condensation. | 02-19-2015 |
20150047341 | METHODS AND SYSTEMS FOR BOOST CONTROL - Methods and systems are provided for varying a proportion of compressed air recirculated to a compressor inlet from a location downstream of the compressor and upstream of a charge air cooler and a location downstream of the charge air cooler. A temperature-controlled compressor recirculation flow is used to reduce condensation from EGR being ingested into the compressor. The temperature-controlled compressor recirculation flow is also used to address compressor surge. | 02-19-2015 |
20150047346 | METHODS AND SYSTEMS FOR BOOST CONTROL - Methods and systems are provided for varying a proportion of compressed air recirculated to a compressor inlet from a location downstream of the compressor and upstream of a charge air cooler and a location downstream of the charge air cooler. A temperature-controlled compressor recirculation flow is used to reduce condensation from EGR being ingested into the compressor. The temperature-controlled compressor recirculation flow is also used to address compressor surge. | 02-19-2015 |
20150047347 | METHODS AND SYSTEMS FOR BOOST CONTROL - Methods and systems are provided for managing a compressor temperature using EGR to address surge and condensation. A variable mixture of cooled compressor recirculation flow and hot EGR is provided to a compressor inlet. A composition of the mixture is adjusted to maintain a compressor inlet temperature sufficiently warm so as to reduce ingestion of condensation, and a compressor outlet temperature sufficiently cold to be within component temperature limits with flow above the surge limit. | 02-19-2015 |
20150047374 | METHODS AND SYSTEMS FOR CONDENSATION CONTROL - Methods and systems are provided for reducing condensate accumulation at a charge air cooler (CAC) during cold ambient conditions. During defrosting conditions, an air conditioner may be operated to dehumidify a cabin space while heat is rejected into a cooling circuit. Warm coolant may be directed to a CAC bypassing a radiator to expedite CAC heating. | 02-19-2015 |
20150047618 | METHODS AND SYSTEMS FOR EGR CONTROL - Methods and systems are provided for using compressor recirculation flow via a venturi to enhance low pressure EGR flow. The opening of a compressor recirculation valve can be adjusted based on EGR flow demand to recirculate cooled compressed air through a venturi while generating vacuum for drawing EGR. The approach allows for concurrent EGR control and surge control. | 02-19-2015 |
20150051762 | METHODS AND SYSTEMS FOR TORQUE CONTROL - Methods and systems are provided for improving surge control. When surge conditions are approached, a reference governor reduces engine airflow at a slower rate and to a higher level than the engine airflow required to meet the reduced torque demand. The excess torque resulting from the extra airflow is offset by applying a negative torque on the driveshaft via an electric machine coupled to the engine or via alternate engine actuator adjustments. | 02-19-2015 |
20150083086 | METHOD AND SYSTEM FOR IMPROVING ENGINE STARTING - An engine system and method for improving engine starting are disclosed. In one example, engine port throttles are adjusted to improve fuel vaporization of a fuel that includes alcohol. The system and method may improve engine starting and emissions. | 03-26-2015 |