Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-06-09
1990-03-27
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 95, 303103, 188181C, B60T 868, B60T 860
Patent
active
049127446
ABSTRACT:
An anti-lock system for controlling the slip level on one or more wheels of a vehicle by comparing the actual wheel speed with a vehicle reference speed obtained by processing wheel speed signals through a filtering system, the filtering system comprising a selection device which produces an input signal from one or a combination of the wheel speeds, an error forming device which subtracts the required vehicle speed estimate from the input signal to produce a speed error, a non-linear device which is effective to limit the slew rate of the filtering system in both positive and negative directions in accordance with vehicle characteristics, a secondary filter which reduces transients present in the error signal, and an integration device which accumulates the error signal and whose output is fed back to the error forming device as the required vehicle speed estimate.
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patent: 4037882 (1977-07-01), Taylor
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patent: 4762375 (1988-08-01), Maki et al.
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patent: 4818037 (1989-04-01), McEnnan
patent: 4852951 (1989-08-01), Matsuda
Butler Douglas C.
Lucas Industries Public Limited Company
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