Abstract: A hybrid power train and method for operating same in which the operation of the engine is modified to effect an improvement in the fuel economy and/or emissions performance of the hybrid power train. In one embodiment, the battery of the power train is employed to provide auxiliary heat to an engine aftertreatment system to thereby improve the effectiveness of the aftertreatment system. In another embodiment, various components of the engine, such as a water pump, are wholly or partly operated by electric motors that receive power from the battery of the power train. In another embodiment, engine braking can be employed in situations where regenerative braking does not provide sufficient braking torque. In a further embodiment, the engine valves may be selectively opened to reduce pumping losses associated with the back-driving of the engine.

Abstract: A hybrid powertrain and method for operating same in which the operation of the engine is modified to effect an improvement in the fuel economy and/or emissions performance of the hybrid powertrain. In one embodiment, the battery of the powertrain is employed to provide auxiliary heat to an engine aftertreatment system to thereby improve the effectiveness of the aftertreatment system. In another embodiment, various components of the engine, such as a water pump, are wholly or partly operated by electric motors that receive power from the battery of the powertrain. In another embodiment, engine braking can be employed in situations where regenerative braking does not provide sufficient braking torque. In a further embodiment, the engine valves may be selectively opened to reduce pumping losses associated with the back-driving of the engine.

Abstract: The hybrid powertrain includes an internal combustion engine, a regenerative brake/motor and an electric energy storage device such as a battery. Preferably the internal combustion engine is a diesel engine with programmable injection events and programmable intake and exhaust valve events. The regenerative brake/motor is capable of operating as both an electric generator and as an electric motor. The battery receives electric energy from the regenerative brake. In additional to supplying electricity to the motor, the battery drives the engine accessories. The battery also supplies electric energy to keep the exhaust aftertreatment systems (Lean NOx, NOx absorber, PM Filter) at optimal temperature to improve conversion efficiency. A powertrain controller schedules the energy distribution and driving forces associated with both the diesel engine and the motor to maximize the vehicle fuel economy and to minimize the vehicle exhaust emissions.