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| 20090082936 | APPARATUS, SYSTEM, AND METHOD FOR PREVENTING TURBOCHARGER OVERSPEED IN A COMBUSTION ENGINE - An apparatus, system, and method are disclosed for preventing turbocharger overspeed in a combustion engine. The method includes determining a turbocharger error term as a difference between a nominal turbocharger maximum speed and a current turbocharger speed. The method further includes determining a turbocharger speed derivative with respect to time. The method includes calculating a turbocharger control response based on the turbocharger error term and the turbocharger speed derivative with respect to time. The turbocharger control response may be a modified turbocharger maximum speed calculated by determining a reference speed multiplier based on the turbocharger error term and the turbocharger speed derivative with respect to time, and multiplying the reference speed multiplier by the nominal turbocharger maximum speed. The method thereby smoothly anticipates turbocharger transient events, and prevents an overspeed condition of the turbocharger. | 03-26-2009 |
| 20090211229 | APPARATUS, SYSTEM, AND METHOD FOR REDUCING NITROGEN OXIDE EMISSIONS IN A COMBUSTION ENGINE - An apparatus, system, and method are disclosed for reducing nitrogen oxide emissions in a combustion engine. The method includes a shift detection module determining an out of gear (OOG) indicator for a manual transmission. The method further includes an engine speed module determining an engine speed target based on at least one operating condition of the engine. The method continues with a load determination module determining an engine load target in response to the OOG indicator and an engine acceleration module determining a desired net torque based on the engine speed target and the engine load target. Finally, the method concludes with an emissions module determining a minimum fuel target based on the desired net torque and an actuation module generating a fueling signal to engage an engine fueling. | 08-27-2009 |
| 20090222190 | APPARATUS AND METHOD FOR PREVENTING AN UNDERSPEED EVENT OF A TURBOCHARGER - A method is disclosed for preventing an underspeed event of a turbocharger. The method includes interpreting a turbocharger speed, a compressor differential pressure (CDP) and a turbocharger differential pressure (TDP). The method further includes calculating a thrust load capacity (TLC) based on the turbocharger speed, and calculating a current thrust load (CTL) based on the CDP and the TDP. The method further includes calculating a thrust margin based on the TLC and the CTL, and controlling an actuator in response to the thrust margin. Controlling the actuator includes maintaining the thrust margin to a thrust margin target, which may be a function of the turbocharger speed. The actuator is a turbine bypass valve, a compressor bypass valve, a variable geometry turbocharger position, an exhaust throttle and/or an exhaust gas recirculation valve that controls the turbocharger speed. | 09-03-2009 |
| 20100154412 | APPARATUS AND METHOD FOR PROVIDING THERMAL MANAGEMENT OF A SYSTEM - An embodiment is an apparatus for providing thermal management of a diesel aftertreatment device. The apparatus includes an intake throttle, at least one exhaust gas recirculation (EGR) valve coupled to the intake throttle, a turbine bypass valve coupled to the at least one EGR valve and a control mechanism coupled to the intake throttle, the at least one EGR valve and the turbine bypass valve for selectively actuating at least one of the valves based on an engine operation profile. | 06-24-2010 |
| 20100180590 | BYPASS VALVE ACTUATION - A system and method for controlling air flow in an engine system. In one embodiment, the system includes an engine, a turbocharger coupled to the engine, and a compressor bypass valve coupled to the turbocharger and to the engine. The compressor bypass valve includes a mechanism that allows the compressor bypass valve to be closed by default and allows the compressor bypass valve to be actuated passively when acted upon by a boost pressure when the boost pressure increases above a predefined pressure threshold. According to the system and method disclosed herein, the compressor bypass valve is passive, and thus controls air flow to the engine without requiring active control circuitry or logic. | 07-22-2010 |
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| 20090178406 | APPARATUS, SYSTEM, AND METHOD FOR UTILIZING A DIESEL AFTERTREATMENT DEVICE BETWEEN THE HIGH PRESSURE AND LOW PRESSURE TURBINE STAGES OF A TWO-STAGE TURBOCHARGING SYSTEM - An apparatus, system, and method are disclosed for utilizing a diesel aftertreatment device between the high pressure and low pressure turbine stages of a two-stage turbocharging system. A diesel aftertreatment device is connected in series between the high pressure turbine and the low pressure turbine such that the diesel aftertreatment device receives inflow from the high pressure turbine and provides outflow to the low pressure turbine. A bypass mechanism is provided such that at low engine speeds or loads, engine exhaust flows through the high pressure turbine as well as the diesel aftertreatment device, but at high engine speeds or loads, the high pressure turbine and diesel aftertreatment device are bypassed, thereby allowing the engine to operate more efficiently while still effectively removing pollutants from the engine exhaust. | 07-16-2009 |
| 20090188251 | APPARATUS, SYSTEM, AND METHOD FOR TURBOCHARGER BYPASS AND EXHAUST BREAKING WITH A SINGLE VALVE - An apparatus, system, and method are disclosed for a single-actuated multi-function valve. The apparatus includes a primary fluid conduit, a secondary fluid conduit, and a valve. The primary fluid conduit flows from an exhaust manifold to an outlet through a high pressure turbocharger and a low pressure turbocharger. The secondary fluid conduit flows from the exhaust manifold to an outlet through the low pressure turbocharger. The valve has two flow passages—the first flow passage is a variable restriction within the primary fluid conduit, and the second flow passage is a variable restriction within the secondary fluid conduit. Turning the valve one direction from a nominal position controls the flow ratios in the primary and secondary fluid conduits, while turning the valve in the other direction from the nominal position controls exhaust braking. | 07-30-2009 |
| 20090211248 | APPARATUS, SYSTEM, AND METHOD FOR PREDICTIVE CONTROL OF A TURBOCHARGER - An apparatus, system, and method are disclosed for predictive control of a turbocharger. The method includes interpreting a compressor performance model for a turbocharger, and interpreting at least one current operating parameter. The method further includes calculating a performance margin, calculating a performance margin derivative, and calculating a response value. The performance margin comprises a choke margin or a surge margin according to the position of an operating point in the compressor performance model. The performance margin is implemented in a first sigmoid function, and the performance margin derivative is implemented in a second sigmoid function. The response value is determined by applying a MIN function to the output of the product of the sigmoid functions in the choke margin case, and by applying a MAX function to the product of the sigmoid functions in the surge margin case. | 08-27-2009 |
| 20090250042 | System and Method for Controlling a Flow of Intake Air Entering an Internal Combustion Engine - A system and method are provided for controlling a flow of intake air entering an internal combustion engine. At least some of the intake air is diverted away from the engine in response to detection of a first operating condition that is indicative of a minimum engine fueling rate. A second operating condition that is indicative of a flow rate of the intake air entering the engine is monitored, and diverting at least some of the intake air away from the engine is discontinued if the second operating condition indicates that the flow rate of the intake air entering the engine is within a threshold value of a target flow rate. | 10-08-2009 |
| 20090250043 | System and Method for Controlling an Exhaust Gas Recirculation System - A system and method are provided for controlling recirculation of exhaust gas to an internal combustion engine having an exhaust gas recirculation (EGR) system comprising an EGR conduit coupled between an exhaust manifold and an intake manifold of the engine. Exhaust gas produced by the engine is trapped within the EGR system in response to detection of a first operating condition that is indicative of a minimum engine fueling rate. The trapped exhaust gas is released from the EGR system into the intake manifold of the engine in response to detection of a second operating condition that is indicative of a subsequent increase in engine fueling rate above the minimum engine fueling rate. | 10-08-2009 |
| 20090314082 | VIRTUAL TURBINE SPEED SENSOR - According to one exemplary embodiment, a virtual turbine speed sensor for a multi-stage turbocharger system of an internal combustion engine is disclosed. The multi-stage turbocharger system includes at least two sequential turbochargers each having a compressor and a turbine. The virtual turbine speed sensor includes a compressor efficiency module, an inter-stage air temperature module, and a turbine speed module. The compressor efficiency module is configured to estimate an efficiency of a compressor of a first of the at least two turbochargers. The inter-stage air temperature module is configured to estimate an inter-stage temperature of air between the at least two compressors. The inter-stage temperature estimate is based at least partially on the efficiency of the compressor of the first turbocharger. The turbine speed module is configured to estimate a speed of a turbine of a second of the at least two turbochargers. The speed estimate of the turbine of the second turbocharger is based at least partially on the temperature estimate of air between the at least two compressors. | 12-24-2009 |
