Controlling a hydraulic hybrid vehicle powertrain having an...

Details Controlling a hydraulic hybrid vehicle powertrain having an... Controlling a hydraulic hybrid vehicle powertrain having an...

2006-12-05

2006-12-05

Nguyen, Thu V. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Control of power distribution between vehicle axis or wheels

C903S945000

Reexamination Certificate

active

07146266

ABSTRACT:
A motor vehicle powertrain system according to this invention controls the magnitudes of torque produced by multiple power sources that drive the vehicle wheels. The system includes a source of pressurized fluid, and a pump/motor driveably connected to the wheels, which is driven in a motoring mode by fluid from the fluid source and has a variable volumetric displacement that changes in response to displacement of the accelerator pedal. An engine, driveably connected to the wheels, includes a throttle that opens and closes in response to displacement of the accelerator pedal. A controller controls operation of the engine and pump/motor such that they produce torque at various magnitudes. The system determines a magnitude of desired wheel torque, a maximum available engine wheel torque, a maximum available pump/motor wheel torque, a difference in magnitude between the desired wheel torque and the maximum available pump/motor wheel torque, operates the pump/motor as a motor such that the pump/motor produces a magnitude of wheel torque that is equal to the lesser of the desired wheel torque and the maximum available pump/motor wheel torque, and operates the engine such that the engine produces a magnitude of wheel torque that is equal to the lesser of the maximum available engine wheel torque and the difference in torque magnitude.

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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.

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