Patent ID: 9663108
Date: 2017-05-30
CPC Classifications: B60W,Y10T

Claim:
1. A controller-implemented method for operating a powertrain system of a vehicle, comprising: monitoring an initial creep torque command and an operator-selected direction of travel; monitoring a magnitude and a direction of vehicle speed; monitoring an operator braking request magnitude; determining a braking-modified creep torque command by adjusting the initial creep torque command through multiplication by a first multiplier ranging between 0 and 1 in direct relation to the operator braking request magnitude; providing a second multiplier inversely related to said first multiplier when the direction of vehicle speed is opposite the operator-selected direction of travel; determining a second creep torque command by adjusting the braking-modified creep torque command through multiplication by said second multiplier; selecting a second braking-modified creep torque command as one of the initial creep torque command and the second creep torque command based upon a comparison of the initial creep torque command with a torque threshold; determining a preferred axle creep torque command as the lesser of the second braking-modified creep torque command and the initial creep torque command; and operating the hybrid powertrain to generate axle torque that is responsive to the preferred axle creep torque command.