Patent application number | Description | Published |
20100024780 | FUEL DELIVERY SYSTEM FOR MULTI-FUEL ENGINE - A fuel delivery system for an internal combustion engine and a method of operating the fuel delivery system are provided. An example embodiment of the method includes: transferring at least some fuel from a first fuel storage region to a second fuel storage region via a pump during a first condition; draining at least some fuel from the second fuel storage region to the first storage fuel region via gravity during a second condition; and delivering fuel from the first fuel storage region to a first fuel injector of a cylinder of the internal combustion engine; and delivering fuel from the second fuel storage region to a second fuel injector of the cylinder. | 02-04-2010 |
20110162620 | METHOD AND SYSTEM FOR ENGINE CONTROL - Methods and systems are provided for controlling exhaust emissions by adjusting a fuel injection into an engine cylinder from a plurality of fuel injectors based on the fuel type of the injected fuel and further based on the soot load of the engine. Soot generated from direct fuel injection is reduced by decreasing an amount of direct injection into a cylinder as the engine soot load increases. | 07-07-2011 |
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 |
20120023937 | FIXED RATE EGR SYSTEM - A method is provided for controlling EGR flow in turbocharged engine. The method comprises operating a low-pressure exhaust gas recirculation (LP-EGR) system at a fixed EGR percentage rate of fresh airflow from mid-load down to a minimum engine load, even as load changes. In this way, errors in the delivered LP-EGR rate during transient conditions may be alleviated by providing a fixed EGR percentage of fresh airflow at all engine loads within a fixed mode range. | 02-02-2012 |
20120116655 | METHOD AND SYSTEM FOR ENGINE CONTROL - Methods and systems are provided for controlling exhaust emissions by adjusting a fuel injection into an engine cylinder from a plurality of fuel injectors based on the fuel type of the injected fuel and further based on the soot load of the engine. Soot generated from direct fuel injection is reduced by decreasing an amount of direct injection into a cylinder as the engine soot load increases. | 05-10-2012 |
20130013172 | METHOD AND SYSTEM FOR ENGINE CONTROL - Methods and systems are provided for controlling exhaust emissions by adjusting a fuel injection into an engine cylinder from a plurality of fuel injectors based on the fuel type of the injected fuel and further based on the soot load of the engine. Soot generated from direct fuel injection is reduced by decreasing an amount of direct injection into a cylinder as the engine soot load increases. | 01-10-2013 |
20130205774 | ASYMMETRIC EXHAUST GAS RECIRCULATION SYSTEM - Systems and methods for a twin turbocharged engine with a single exhaust gas recirculation (EGR) system are disclosed. In one example approach a system is provided comprising a first turbocharger in a first intake passage with a low-pressure EGR system fluidically coupling exhaust exiting the first turbocharger to intake air entering the first turbocharger, and a second turbocharger in a second intake passage without a low-pressure EGR system fluidically coupling exhaust exiting the second turbocharger to intake air entering the second turbocharger. | 08-15-2013 |
Patent application number | Description | Published |
20140130506 | TURBOCHARGER ARRANGEMENT AND SET OF FEEDBACKS FOR ELECTRIC ACTUATOR CONTROL - Various methods for controlling a wastegate with an actuator having a temperature-dependent magnetic field are provided. In one example, the magnetic field is estimated based on operating conditions and other parameters, and used to apply a magnetic correction to a voltage supplied to the actuator. The methods may provide accurate wastegate control in the presence of varying magnetic fields, ensuring the proper supply of boost to an engine. | 05-15-2014 |
20140174073 | EXHAUST PRESSURE ESTIMATION FROM WASTEGATE MOTOR CURRENT - In one embodiment, a method for an engine comprises adjusting an engine operating parameter based on exhaust pressure, the exhaust pressure estimated based on wastegate actuator motor current. | 06-26-2014 |
20140174074 | TWIN TURBOCHARGER WASTEGATE CONTROL - An engine system comprises a first turbocharger including a first wastegate, first wastegate actuator, and first turbocharger sensor, a second turbocharger including a second wastegate, second wastegate actuator, and second turbocharger sensor, and a controller configured to adjust the first wastegate actuator so that a parameter of the first turbocharger matches a parameter of the second turbocharger, based on output from the first and second turbocharger sensors. In this way, turbocharger output between the two turbochargers may be balanced. | 06-26-2014 |
20140202435 | LOW-PRESSURE EGR CONTROL DURING COMPRESSOR BYPASS VALVE OPERATION - A turbocharged engine system including a low-pressure exhaust gas recirculation (EGR) system and an intake oxygen sensor is described, along with methods for its operation. The system includes a compressor bypass valve arranged in a passage bypassing a turbocharger compressor, and an EGR valve arranged in an EGR system which may be adjusted to adjust an amount of exhaust gas recirculated to the engine intake. In one example method, over-dilution of an engine intake charge may be reduced by reducing EGR upon opening of the compressor bypass valve, and then increasing the EGR only after measurements from an intake oxygen sensor indicate that intake air dilution has decreased below a threshold. | 07-24-2014 |
20140316675 | PRESERVING COMBUSTION STABILITY DURING COMPRESSOR-SURGE CONDITIONS - A method to avoid over-dilution of an intake-air charge of an engine includes, during a first condition, applying at least some feedback control to the opening and closure of a valve that adjustably admits exhaust to the intake-air charge. During a second condition predictive of compressor surge, no feedback control is applied to the opening or the closure of the valve. Rather, feedforward control is applied to the closure of the valve so that stability in the engine is maintained even during surge conditions. | 10-23-2014 |
20140325959 | VARIABLE VALVE SYSTEM TO REDUCE CONDENSATION IN A CHARGE AIR COOLER - Methods and systems are provided for regulating air flow through a charge air cooler. In one example, an air flow regulating element may be positioned in a tank of the charge air cooler, the air flow regulating element including a cylindrical barrel valve rotatable about a rotational axis to adjust air flow through cooling tubes in the charge air cooler. A position of the barrel valve may be based on a mass air flow rate and/or a temperature at an outlet of the charge air cooler. | 11-06-2014 |
20140352668 | SYSTEMS AND METHODS FOR HEATING A PRE-COMPRESSOR DUCT TO REDUCE CONDENSATE FORMATION - Methods and systems are provided for providing auxiliary heat to a pre-compressor duct wall to reduce condensate formation. A coolant valve may control the delivery of heated engine coolant to the pre-compressor duct wall. The coolant valve may be adjusted based on condensate formation at the pre-compressor duct wall. | 12-04-2014 |
20150053177 | METHOD AND SYSTEM FOR KNOCK CONTROL - Methods and systems are provided for improving engine knock tolerance, in particular when rapidly ramping in LP-EGR from low levels of EGR. Until a desired LP-EGR rate is achieved, fuel may be delivered as a split injection with at least an intake stroke injection and a compression stroke injection to compensate for the transport delay in EGR filling the intake system. Subsequently, single fuel injection may be resumed. | 02-26-2015 |
20150053186 | LEARNING OF EGR VALVE LIFT AND EGR VALVE FLOW TRANSFER FUNCTION - Methods and systems are provided for improving accuracy of delta pressure over valve (DPOV) based EGR flow measurement during low valve lift conditions by learning errors in EGR valve lift and/or EGR valve flow transfer function. | 02-26-2015 |
20150057911 | METHOD AND SYSTEM FOR IMPROVED DILUTION TOLERANCE - Methods and systems are provided for improving combustion stability, in particular during transient operations such as tip-out to lower load conditions, when EGR is being purged. Until a desired LP-EGR rate is achieved, fuel may be delivered as a split injection with at least an intake stroke injection and a compression stroke injection. Subsequently, single fuel injection may be resumed. | 02-26-2015 |
20150075502 | METHODS AND SYSTEMS FOR AN INTAKE OXYGEN SENSOR - Methods and systems are provided for adjusting a reference voltage for an intake manifold oxygen sensor based on ingestion of hydrocarbons from a fuel system canister and/or an engine crankcase. During conditions when purge or crankcase ventilation hydrocarbons are ingested in the intake aircharge, the intake oxygen sensor is transitioned from operating at a lower reference voltage to a higher reference voltage where the effects of the ingested hydrocarbons on the sensor output are nullified. An EGR dilution of the intake aircharge is estimated based on the output of the sensor at the higher reference voltage while an amount of hydrocarbons ingested is estimated based on a difference between sensor outputs at the higher and lower reference voltages. | 03-19-2015 |