Fluid-pressure and analogous brake systems – Speed-controlled – Regenerative brakes
Reexamination Certificate
2007-06-19
2007-06-19
Williams, Thomas (Department: 3683)
Fluid-pressure and analogous brake systems
Speed-controlled
Regenerative brakes
C303S010000, C180S165000, C060S414000
Reexamination Certificate
active
10883320
ABSTRACT:
A system for braking the wheels of a hydraulic hybrid vehicle includes a brake pedal having a range of pedal displacement including a deadband displacement range, an accumulator containing fluid at relatively high pressure, a reservoir containing fluid at lower pressure, a pump/motor having variable volumetric displacement connected to the accumulator and reservoir, and driveably connected to the wheels; a system responsive to brake pedal displacement in the deadband range for placing the pump/motor in a pump state wherein the pump/motor is driven by the wheels and pumps fluid from the reservoir to the accumulator; and a control valve for changing the volumetric displacement of the pump/motor in response to displacement of the brake pedal.
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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
Kepner Ron
Tang Chuanchi
Teslak Chris
Ford Global Technologies LLC
Kelley David B.
MacMillan Sobanski & Todd LLC
Williams Thomas
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