Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1994-02-22
1995-08-29
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 962, 303 969, 303187, B60T 832
Patent
active
054454450
ABSTRACT:
An antiskid control device is disclosed. This device is capable of controlling the braking of a vehicle such as an automobile so as to obtain a reduced stopping distance while simultaneously making it possible to maintain the stability and steerability of the vehicle. The device is comprised of two pressure-mediating circuits provided in two lines leading from a master cylinder. Each circuit is connected first to a front brake, then to the diagonal rear brake and then returns to the reservoir. An inlet valve is interposed in each pressure-mediating circuit between the master cylinder and the front brake. An outlet valve is interposed in the return of each pressure-mediating circuit after the rear brake. The inlet and outlet valves are controlled based on a computation analysis of wheel speed. The device is further characterized by having a normally open opening/closing valve interposed in the pressure-mediating circuit between the line which connects the inlet valve to the front wheel brake, and the line which connects the outlet valve and the rear wheel brake. This opening/closing valve is controlled based on a computational analysis of wheel speed such that if rear wheel lock-up is detected in a given circuit, the opening-closing valve can close and permit pressure to be relieved on the rear brake through the outlet valve while permitting independent control of the braking pressure on the front brake.
REFERENCES:
patent: 4418966 (1983-12-01), Hattwig
patent: 4962971 (1991-10-01), Miyake
patent: 5021957 (1991-06-01), Yoshino et al.
patent: 5750788 (1988-04-01), Seibert et al.
Bozicevic Karl
Graham Matthew C.
Nissinbo Industries Inc.
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