Land vehicles – Wheeled – Occupant propelled type
Reexamination Certificate
2006-12-12
2006-12-12
Shriver, J. Allen (Department: 3618)
Land vehicles
Wheeled
Occupant propelled type
C180S165000, C180S307000, C060S414000
Reexamination Certificate
active
07147239
ABSTRACT:
A system according to this invention opposes creep in a hydraulic hybrid motor vehicle. An accumulator contains fluid at high pressure, and a reservoir contains fluid at lower pressure. An engine produces positive torque at the wheels during an engine idle condition, and a pump/motor, driveably connected to the wheels and the engine, has a variable volumetric displacement pumps fluid to the accumulator from the reservoir. A control system determines a magnitude of negative torque transmitted from the wheels to the pump/motor that would exceed the magnitude of positive torque, determines the volumetric displacement of the pump/motor corresponding to the magnitude of negative torque, changes the displacement of the pump/motor to the required displacement, and operates the pump/motor as a pump driven by negative torque from the wheels to pump fluid from the reservoir to the accumulator.
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SAE Technical Paper Series 2002-01-3128, R.P. Kepner, Ford Motor Company, Hydraulic Power Assist—A Demonstration of Hydraulic Hybrid Vehicle Regenerative Braking in a Road Vehicle Application, Nov. 18-20, 2002, pp. 1-8.
Carlson Cliff
Teslak Chris
Ford Global Technologies LLC
Kelley David B.
MacMillan Sobanski & Todd
Shriver J. Allen
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