Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-01-30
1992-06-23
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 97, B60T 870
Patent
active
051237148
ABSTRACT:
An antiskid apparatus including a first filter circuit having a predetermined cut-off frequency and a second filter circuit having a variable cut-off frequency, each of which filter the speed of a vehicle wheel. The output of the first filter circuit is applied to a deceleration detecting circuit, a vehicle speed detecting circuit, and a slip quantity calculating circuit for respectively calculating the deceleration of the vehicle wheel, the estimated vehicle speed, and a slip quantity of the vehicle wheel with respect to the vehicle speed. In response to the first wheel deceleration signal and the slip quantity signal, a cut-off frequency changing circuit alters the cut-off frequency of the second filter circuit, whose output is applied to a second wheel deceleration detecting circuit. As a result, a control quantity calculating circuit, in response to the outputs of the first and second wheel deceleratioin detecting circuits, or an output of the slip quantity calculating circuit, can determine an amount of braking pressure increase or decrease to avoid wheel locking.
REFERENCES:
patent: 3716273 (1973-02-01), Beyerlein
patent: 3827760 (1974-08-01), Fleagle
patent: 3843207 (1974-10-01), Syria
patent: 3856365 (1974-12-01), Steigerwald et al.
patent: 3993362 (1976-11-01), Kamins et al.
patent: 5012417 (1991-10-01), Watanabe et al.
Graham Matthew C.
Mitsubishi Denki K.K.
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