Patent ID: 9545839
Date: 2017-01-17
CPC Classifications: B60K,B60L,B60W,Y02T

Claim:
1. A method for controlling reverse driving wheel torque in a powertrain for a hybrid electric vehicle; the powertrain having an engine, an electric motor, an electric battery, an electric motor-generator; and split power delivery paths extending from the engine and the motor to vehicle traction wheels; the method comprising: requesting a desired reverse driving power at the traction wheels; measuring battery state-of-charge; comparing requested reverse driving power to available battery power at the measured state-of-charge; requesting a minimum engine power when the reverse driving power request is less than the available battery power for the measured battery state-of-charge; computing engine torque at the minimum engine power request; and controlling engine speed and engine torque to achieve the minimum engine power during reverse drive such that enhanced reverse driving torque at the traction wheels is achieved as the motor drives the traction wheels.