Abstract: A method for managing power in a hybrid electric vehicle powertrain having multiple components including at least two of a group comprising an engine, a motor, a generator and a high voltage battery includes computing power losses for the individual components. An engine operating speed and torque for a given vehicle speed and total power command is determined so that total power losses for powertrain components are minimized.

Abstract: 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.

Abstract: A method, apparatus, and system are disclosed for hybrid power system braking. In one embodiment, a deceleration input is received. In response to receiving the deceleration input, a target negative torque trajectory is determined. To achieve the target negative torque trajectory, a regenerative braking device and an electrical energy dissipation device are activated.

Abstract: A method includes providing an internal combustion engine having an output shaft and producing an exhaust gas stream, providing an electric motor operatively coupled to the output shaft, and determining a regeneration state of an aftertreatment component that treats the exhaust gas stream. The method further includes determining an engine torque requirement such that, when the internal combustion engine achieves the engine torque requirement at a present set of operating conditions, a temperature of the exhaust gas stream will achieve an exhaust gas temperature threshold. The method further includes commanding the electric motor to apply a counter torque to the output shaft in response to the regeneration state indicating an active thermal regeneration event, where the counter torque comprises is high enough for the internal combustion engine to achieve the engine torque requirement. The exhaust gas temperature threshold may be a hold-warm temperature and/or a regeneration temperature.

Abstract: A method, apparatus, and system are disclosed for hybrid power system braking. In one embodiment, a deceleration input is received. In response to receiving the deceleration input, a target negative torque trajectory is determined. To achieve the target negative torque trajectory, a regenerative braking device and an electrical energy dissipation device are activated.

Abstract: A method includes providing an internal combustion engine having an output shaft and producing an exhaust gas stream, providing an electric motor operatively coupled to the output shaft, and determining a regeneration state of an aftertreatment component that treats the exhaust gas stream. The method further includes determining an engine torque requirement such that, when the internal combustion engine achieves the engine torque requirement at a present set of operating conditions, a temperature of the exhaust gas stream will achieve an exhaust gas temperature threshold. The method further includes commanding the electric motor to apply a counter torque to the output shaft in response to the regeneration state indicating an active thermal regeneration event, where the counter torque comprises is high enough for the internal combustion engine to achieve the engine torque requirement. The exhaust gas temperature threshold may be a hold-warm temperature and/or a regeneration temperature.

Abstract: A method for managing power in a hybrid electric vehicle powertrain having multiple components including at least two of a group comprising an engine, a motor, a generator and a high voltage battery includes computing power losses for the individual components. An engine operating speed and torque for a given vehicle speed and total power command is determined so that total power losses for powertrain components are minimized.

Abstract: Various embodiments of an apparatus, system, and method are disclosed for managing regeneration event characteristics. For example, according to one embodiment, an apparatus for controlling the temperature of the outlet exhaust of an internal combustion engine for a regeneration event on a particulate matter filter includes a regeneration module and a fuel injection strategy module. The regeneration module is configured to determine a desired engine outlet exhaust gas temperature for a regeneration event. The fuel injection strategy module is configured to determine a regeneration fuel injection strategy for achieving the desired engine outlet exhaust gas temperature. The regeneration fuel injection strategy includes a main fuel injection, a first heat post-injection, and a second heat post-injection. In certain implementations, the fuel injection strategy also includes at least one or two non-heat post-injections for achieving a desired particulate filter inlet exhaust gas temperature.

Abstract: A method is disclosed for managing power in a hybrid electric vehicle powertrain having multiple components, including at least two of a group comprising an engine, a motor, a generator and a high voltage battery. Power losses in the individual components are computed. An engine operating speed and torque for a given vehicle speed and total power command is determined so that total power losses for powertrain components are minimized.

Abstract: A method is disclosed for managing power in a hybrid electric vehicle powertrain having multiple components, including at least two of a group comprising an engine, a motor, a generator and a high voltage battery. Power losses in the individual components are computed. An engine operating speed and torque for a given vehicle speed and total power command is determined so that total power losses for powertrain components are minimized.

Abstract: 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.

Abstract: A method is disclosed for managing power in a hybrid electric vehicle powertrain having multiple components, including an engine, a motor, a generator and a high voltage battery. Power losses in the individual components are computed. An engine speed corresponding to a minimum value for the power losses is selected to achieve optimal total powertrain efficiency.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Various embodiments of an apparatus, system, and method are disclosed for managing regeneration event characteristics. For example, according to one embodiment, an apparatus for controlling the temperature of the outlet exhaust of an internal combustion engine for a regeneration event on a particulate matter filter includes a regeneration module and a fuel injection strategy module. The regeneration module is configured to determine a desired engine outlet exhaust gas temperature for a regeneration event. The fuel injection strategy module is configured to determine a regeneration fuel injection strategy for achieving the desired engine outlet exhaust gas temperature. The regeneration fuel injection strategy includes a main fuel injection, a first heat post-injection, and a second heat post-injection. In certain implementations, the fuel injection strategy also includes at least one or two non-heat post-injections for achieving a desired particulate filter inlet exhaust gas temperature.

Abstract: 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.