Fluid-pressure and analogous brake systems – Speed-controlled – Front-rear axle apportioning or speed difference
Patent
1995-08-28
1997-05-27
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Front-rear axle apportioning or speed difference
3031135, 188349, B60T 826, B60T 860, B60T 834
Patent
active
056325355
ABSTRACT:
A dynamic rear proportioning system is integrated with an existing vehicle anti-lock braking system (ABS) and performs the function of the rear brake pressure proportioning where ABS is not required. The rear brake hydraulic channel(s) are isolated from the master cylinder by activating the rear isolation valves, provided in the ABS, to provide the optimum brake force balance, regardless of vehicle loading, without the use of a load sensing mechanism. The system estimates vehicle and wheel deceleration, vehicle speed, and lateral acceleration as well as the rear wheel slip to dynamically control the rear brake force. By continually updating these control parameters, the system can further increase or decrease the rear brake pressure to maintain the optimum brake force balance throughout the braking maneuver.
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Bielek Mark R.
Luckevich Mark S.
Negrin Dan
Butler Douglas C.
Kelsey-Hayes Company
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