Patent ID: 6775601
Filing Date: 2004-08-10
Classification: B60K,B60L,B60W,Y02T

Abstract:
A method for controlling a propulsion system in a hybrid vehicle including a traction motor and an internal combustion engine, the method comprising:sensing a signal indicative of vehicle torque demand; selecting a threshold torque range indicative of conditions of relatively low vehicle torque demand; processing the signal indicative of vehicle torque demand to determine whether the vehicle torque demand is within the threshold torque range; during conditions when the signal indicative of vehicle torque demand is within the threshold torque range, generating a signal configured to activate the electric traction motor to drivingly propel the vehicle while de-engaging the internal combustion engine from propelling the vehicle; and during conditions when the signal indicative of vehicle torque demand is outside the threshold torque range, generating a signal configured to deactivate the electric traction motor from drivingly propelling the vehicle while re-engaging the internal combustion engine to propel the vehicle.