Patent ID: 6687582
Filing Date: 2004-02-03
Classification: B60K,B60L,B60W,B60Y,Y02T,Y10T

Abstract:
An idle speed control system for a hybrid vehicle, the idle speed control system comprising:an internal combustion engine selectively coupled to a transmission by a clutch; a motor-generator selectively coupled to the transmission by said clutch; an ancillary device that receives power from at least one of said internal combustion engine or said motor generator; a controller to control an idle mode of said hybrid vehicle; whereby said controller receives inputs indicative of a drive state of said hybrid vehicle, calculates a torque demand value in response to said drive state, and selects one of an engine control mode and a motor-generator control mode to regulate an idle speed of the transmission based in part upon said drive state of said hybrid vehicle; wherein said motor-generator control mode of said controller includes utilizing said motor-generator to provide a transient torque value, and further includes utilizing said internal combustion engine to provide a steady state torque value such that said torque demand value is satisfied.