Patent ID: 7147239
Filing Date: 2006-12-12
Classification: B60K,B60W,F16H,Y02T

Abstract:
1. A method for opposing creep in a vehicle that includes wheels driveably connected to a pump/motor having a variable volumetric displacement for pumping fluid between a high pressure accumulator and a low pressure reservoir, and an engine driveably connected to the wheels and to the pump/motor, the method comprising the steps of: determining a magnitude of positive torque at the wheels that is transmitted from the engine during an engine idle condition; determining a magnitude of negative torque transmitted from the wheels to the pump/motor that would exceed said magnitude of positive torque and hold the wheels against creeping; determining the volumetric displacement of the pump/motor corresponding to said magnitude of negative torque; changing the displacement of the pump/motor to said volumetric displacement; and operating the pump/motor as a pump driven by negative torque from the wheels to pump fluid from the reservoir to the accumulator.