Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-09-11
1993-09-28
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031134, 3031143, 3031161, B60T 834
Patent
active
052481891
ABSTRACT:
A valve mechanism is provided in a hydraulic line which connects a master cylinder of a brake system and a brake provided for a driving wheel of a vehicle. When the slip of the driving wheel is larger than a predetermined value, the valve mechanism is selectively moved between a position where it directly applies brake fluid from the master cylinder to the brake and a position where it returns brake fluid discharged from the brake to an oil reservoir, thereby controlling the driving torque of the driving wheel to converge the slip of the driving wheels to a proper level. An oil pump is operated to return the brake fluid in the oil reservoir to the master cylinder when the valve mechanism is operated to effect the slip control. While the brake pedal is in the released state, the oil pump is kept operated during the slip control and for a predetermined time after interruption of the slip control so that the brake fluid in the oil reservoir is returned to the master cylinder substantially completely. When the brake pedal is depressed while the slip being effected, the slip control is ended and the oil pump is stopped. After the brake pedal is released, the oil pump is operated for a predetermined time.
REFERENCES:
patent: 5141296 (1992-08-01), Arikawa
patent: 5178441 (1993-01-01), Heibel et al.
Izumi Tomoji
Sakamoto Hiroaki
Watanabe Yoshito
Yamashita Tetsuhiro
Butler Douglas C.
Mazda Motor Corporation
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