Fluid-pressure and analogous brake systems – Speed-controlled – Slip ratio
Patent
1997-12-31
1999-09-14
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Slip ratio
188181C, 303121, 303182, 701 71, B60T 832
Patent
active
059511222
ABSTRACT:
A brake control system which employs an antiskid control and wheel lock protection differential reference controller to provide antiskid and antilock brake control. The differential reference controller is capable of estimating both wheel velocity and vehicle velocity based on a single wheel speed sensor input. To reduce the effects of wheel speed noise, the differential reference controller estimates the wheel velocity and vehicle velocity by carrying out parallel processes using identical processing functions. The estimated wheel velocity and vehicle velocity are subtracted providing a differential output indicative of the slip velocity. Only unique parameters for each process, derived from physical constants, are different. In this way, the wheel speed noise is introduced into both processes and canceled when the results are subtracted to obtain the slip velocity.
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Butler Douglas C.
Romanchik Richard A.
Saralino Mark D.
The B.F. Goodrich Company
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