Patent ID: 6336063
Filing Date: 2002-01-01
Classification: B60K,B60L,B60W,F02D,F02N,H01M,Y02E,Y02T,Y10S,Y10T

Abstract:
A method for minimizing driver perceptible drive train disturbances during take-off in a hybrid electric vehicle when maximized power is often desired, said method comprising:sensing an actual state-of-charge (SOC) value of a battery in the hybrid electric vehicle and a traveling velocity of the vehicle during take-off operation; comparing the sensed actual SOC value with a SOC reference value and computing a delta SOC value as a difference therebetween; looking up a velocity-based SOC calibration factor corresponding to the traveling velocity of the vehicle; utilizing a combination of the delta SOC value and the SOC calibration factor as a SOC feedback engine speed control instruction to an engine controller of the hybrid electric vehicle; sensing a driver's desired vehicular acceleration based on accelerator position; determining maximum possible engine power generatable at the sensed vehicle speed; determining a required power value from the power train of the vehicle to meet the driver's desired vehicular acceleration; comparing the maximum possible engine power generatable at the sensed vehicle speed with the required power value and computing a delta power train requirement value as a difference therebetween; looking up a velocity-based and accelerator position-based power calibration factor corresponding to the traveling velocity of the vehicle and the accelerator position; and utilizing a combination of the delta power train requirement value and the power calibration factor as a power requirement feed-forward engine speed control instruction to an engine controller of the hybrid electric vehicle.