ELECTRIC HYBRID POWERTRAIN REGENERATION EFFICIENCY IMPROVEMENT

摘要

A method and system for increasing regenerative energy available during deceleration by reducing engine pumping losses. The method includes a controller that reduces fuel delivery to the engine and closes an engine throttle during deceleration. The controller identifies the maximum kinetic energy available during deceleration and opens an exhaust gas recirculation (EGR) valve and engine throttle as necessary to reduce a vacuum in an engine intake manifold, thus minimizing engine pumping losses and increasing regenerative energy available during deceleration while ensuring that a catalyst temperature is above a catalyst temperature threshold.

主权项

1. A method for increasing regenerative energy available during deceleration by reducing engine pumping losses, the method comprising:
reducing fuel delivery to an engine during deceleration; closing an engine throttle during deceleration; opening an exhaust gas recirculation (EGR) valve to reduce a vacuum in an engine intake manifold, thus minimizing engine pumping losses and increasing regenerative energy available during deceleration; identifying an intake pressure at the engine intake manifold after the EGR valve opens to determine if the intake pressure is above a determined manifold pressure target; identifying a catalyst temperature after the EGR valve opens to determine if the catalyst temperature is above a catalyst temperature threshold; and opening the engine throttle to reduce the intake pressure below the manifold pressure target if the intake pressure exceeds the manifold pressure target and the catalyst temperature is above the catalyst temperature threshold.