Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric
Patent
1992-12-16
1993-10-19
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple systems
Fluid pressure and electric
188156, 188159, 188181T, 303 15, 303DIG3, 303112, B60T 1374
Patent
active
052539296
ABSTRACT:
A brake control system mounted in an electrical vehicle for controlling a hydraulic brake and a regenerative brake. The hydraulic brake generates a hydraulic pressure depending on an amount of depression of a brake pedal so as to mechanically brake at least drive wheels. The regenerative brake brakes the drive wheels due to a regeneration of a running motor. A reducing valve is provided in a hydraulic pressure transmission path to the drive wheels to be braked by the hydraulic brake. The reducing valve is opened when the hydraulic pressure genrated in a cylinder is at least a valve open value to allow a hydraulic pressure transmission to drive wheel pipings. An ECU calculates a regenerative torque command value depending on a pressure difference between the front and rear of the reducing valve, detected by a sensor, and controls the regenerative brake on the basis of the regenerative torque command value. In turn, a liquid amount corresponding to the hydraulic pressure cut off by the reducing valve is consumed with a similar characteristic to the hydraulic brake by a stroke simulator.
REFERENCES:
patent: 4181366 (1980-01-01), Dobner
patent: 4425005 (1984-01-01), Warwick
patent: 4671576 (1987-06-01), Fourie
patent: 4671577 (1987-06-01), Woods
patent: 4962969 (1990-10-01), Davis
Butler Douglas C.
Toyota Jidosha & Kabushiki Kaisha
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