Vehicle brake system with active hydraulic brake force reinforcement
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Abstract
The present invention relates to a method and a device for controlling a vehicle brake system with active hydraulic brake force boosting. In this method, an active pressure-increasing unit and/or a pressure modulation unit is actuated according to a comparison between a nominal pressure or a nominal vehicle speed or quantities derived therefrom, in particular a nominal vehicle acceleration, and an actual pressure or an actual vehicle speed or quantities derived therefrom, in particular an actual vehicle acceleration.
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Citations
28 Claims
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1-14. -14. (canceled)
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15. Method for controlling a vehicle brake system with active hydraulic brake force boosting,
herein an active pressure-increasing unit or a pressure modulation unit is actuated according to a comparison of a nominal pressure or a nominal vehicle speed or quantities derived therefrom, with an actual pressure or an actual vehicle speed or quantities derived therefrom.
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28. Device for controlling a vehicle brake system with active hydraulic brake force boosting, including an actuating unit by means of which the driver can introduce brake pressure into a hydraulic unit, with at least one wheel brake that is connected to the actuating unit by way of the hydraulic unit containing at least one brake line, with a pump communicating with its suction side with the actuating unit by way of a change-over valve and communicating with its pressure side with the brake line, with an actuatable inlet valve arranged in the brake line, with an actuatable separating valve interposed between the inlet valve and the actuating unit, with an actuatable outlet valve arranged in a return line, with a pressure sensor associated with the actuating unit, with a wheel speed sensor and with a first actuating unit for actuating the pump that introduces pressure into the wheel brakes for active brake force boosting when a point of maximum boosting of the brake booster is reached or exceeded,
wherein a first determining unit for determining a nominal pressure or a nominal vehicle acceleration that corresponds to the pressure according to the pressure sensor signal, a second determining unit for determining an actual vehicle acceleration or an actual pressure that corresponds to the vehicle acceleration according to the wheel speed sensor signal, a comparison unit for comparing the nominal pressure with the actual pressure or the actual vehicle acceleration with the nominal vehicle acceleration, a second evaluating unit for actuating the pump or the separating valve according to the comparison, and wherein when the nominal pressure is higher than the actual pressure or when the nominal vehicle acceleration is lower than the actual vehicle acceleration, the pump is actuated for the purpose of generating additional pressure, and when the nominal pressure is lower than the actual pressure or when the nominal vehicle acceleration is higher than the actual vehicle acceleration, the separating valve is actuated for producing an additional pressure reduction.
Specification