System for controlling motor vehicle brakes

Details System for controlling motor vehicle brakes System for controlling motor vehicle brakes

1987-09-09

1989-02-07

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

303100, 303114, 303115, 303DIG3, B60T 842, B60T 1368

Patent

active

048027138

ABSTRACT:
A system for controlling a motor vehicle brake comprising a supply-and-exhaust valve group which supplies hydraulic pressure for a brake to wheel cylinders of brakes and exhausts hydraulic pressure in the wheel cylinders. A switch valve group which controls a supply to the decompression valve so that hydraulic pressure is supplied to the supply-and-exhaust valve group whether passing through the decompression valve or not. Slip dectecting device detects a slipping status of the driving wheels. Slipping threshold value setting device which determines a slipping threshold. Deceleration status detecting device detects a deceleration status of wheels when the vehicle decelerates. Deceleration status threshold value setting device determines a deceleration status threshold value. A control unit controls, in a slip-prevention control of the system, the switch valve group to supply hydraulic pressure to the supply-and-exhaust valve group through the decompression valve, and controls the supply-and-exhaust valve group according to the predetermined slipping threshold value to prevent the driving wheels from slipping. In a skid-prevention control, the control unit controls the switch valve group to supply hydraulic pressure not decompressed by the decompression valve to the supply-and-exhaust valve groups, and controls the supply-and-exhaust valve group according to the deceleration status threshold value in order to prevent the driving and driven wheels from skidding.

REFERENCES:
patent: 4589706 (1986-05-01), Leiber
patent: 4720152 (1988-01-01), Adachi et al.
patent: 4721345 (1988-01-01), Nishimura et al.
patent: 4728155 (1988-03-01), Resch
patent: 4741581 (1988-05-01), Krohn

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