Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1991-07-15
1993-02-23
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 10, 3031161, B60T 1320
Patent
active
051884402
ABSTRACT:
In an antilock braking system (ABS) operating on the recirculating principle with a static brake circuit and a tandem master cylinder as the brake booster, a control stage is provided in order to lessen the intensity of reaction shocks noticeable at the brake pedal when the antilock control commences. From the onset of a pressure reduction signal, the control stage generates, for at least one brake-pressure control valve of the ABS, an operating voltage for the drive motor of the recirculating pump unit which rises with increasing duration of this signal. After a predetermined rising time, the voltage can reach a maximum value, correlated with maximum speed of the motor, and then is held at this value at least until dying-out, or otherwise rises to that value which is reached within the pressure-reduction signal duration. At the dropping of the pressure reduction signal, the control stage effects a constant or stepwise reduction in the operating voltage of the motor until the motor is at a standstill, such that the time integral of the operating voltage over its reduction is greater than the time integral over the rising time of the operating voltage of the drive motor of the recirculating pump unit.
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Faulhaber Andreas
Muller Armin
Zimmer Richard
Mercedes-Benz AG
Muratori Alfred
Oberleitner Robert J.
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