Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-01-26
1990-07-10
Reger, Duane A.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
180197, 303116, B60T 864
Patent
active
049402935
ABSTRACT:
In a drive slip control device for a road vehicle, which is provided with an anti-lock system operating on the pump-back principle and having a return pump of the anti-lock system associated with the brake circuit of the driven vehicle wheels used as the auxiliary pressure source for the drive slip control, for braking a vehicle wheel tending to spin. When the drive slip control is activated, the main brake pipe of the brake circuit of the driven vehicle wheels is shut off from the brake unit by means of a drive slip control valve. The return pump is activated and is shut off from the brake unit until the drive slip of one of the driven vehicle wheels exceeds a threshold value whose magnitude lies between the drive slip required value and threshold response value. The brake pressure control valves of the brake circuit of the driven vehicle wheels are driven into their closed position by means of this anticipatory activation of the return pump. This causes high pressure to build up in the main brake pipe, which is limited to a value of the anti-lock braking system and of the brake equipment by means of a pressure limiting valve, which is then available for an introductory brake pressure build-up phase of the drive slip control on the vehicle wheel requiring it. An additional outlet valve, by means of which the return line of the rear axle of the anti-lock system can be directly connected to the brake fluid reservoir, can be provided for controlling the pressure reduction phases.
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Brugger Franz
Burckhardt Manfred
Faulhaber Andreas
Daimler-Benz AG
Reger Duane A.
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