Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1988-01-21
1989-04-25
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303113, B60T 840
Patent
active
048241881
ABSTRACT:
A brake fluid pressure modulator (108) for an anti-lock braking system (ABS) (100) employs a combined isolation valve/displacement cylinder (130) to effect modulation of brake fluid pressure being delivered to a vehicle's wheel brakes (110F, 110R, 111F, 111R). A control valve assembly (140) reduces and reapplies brake fluid pressure by controlling flow of hydraulic fluid to a stepped piston (1315, 1317) in the displacement cylinder to move the piston against a biasing element (1321) such as a coil die spring. Piston movement against the spring closes an isolation check valve (1307, 1309) to prevent further brake fluid from the vehicle's master cylinder from being delivered to the wheel brakes. The cylinder cavity (1312) resulting from piston movement enables brake fluid to drain from the wheel brake back into the displacement cylinder. Reapplication of brake fluid is effected by allowing flow of hydraulic fluid out of the cylinder with the biasing spring moving the piston back to its idle position, thereby forcing brake fluid back to the wheel brake. The control valve assembly is electrically driven by a control computer (120) which also monitors vehicle wheel speed and cap-off brake pressure via appropriate transducers (112, 150).
REFERENCES:
patent: 4421361 (1983-12-01), Arikawa et al.
patent: 4462642 (1984-07-01), Leiber
patent: 4511971 (1985-04-01), Dittner et al.
patent: 4555145 (1985-11-01), Maehara et al.
Hudraulic Brake Actuation Systems under Consideration of Antilock Systems and Disk Brakes, (O. Depenheuer and H. Strien) May, 1973.
A New Anti-Skid-Brake System for Disc and Drum Brakes (H. Schurr and A. Dittner), Feb. 1984.
Hughes Aircraft Company
Karambelas A. W.
Reger Duane A.
Streeter William J.
LandOfFree
Modulation arrangement for anti-lock brake system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modulation arrangement for anti-lock brake system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modulation arrangement for anti-lock brake system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1190954