| 摘要 |
PCT No. PCT/EP96/04370 Sec. 371 Date Jun. 25, 1998 Sec. 102(e) Date Jun. 25, 1998 PCT Filed Sep. 10, 1996 PCT Pub. No. WO97/13670 PCT Pub. Date Apr. 17, 1997In a hydraulic brake system which is appropriate for active braking operations, the condition that at least one of the low-pressure accumulators is completely emptied during active braking without the suction line from the suction side of the return pump to the brake line being open has to be prevented. Therefore, the current consumption and/or the rotational speed of the drive motor of the return pumps is sensed and evaluated. When the pump idles and the low-pressure accumulator is empty, the rotational speed rises and the current consumption drops. This signal is used to open an electrically operated change-over valve in the corresponding suction line. In addition, a memorized pattern can ensure that the electrically operated change-over valve is open already shortly before exhaustion of the low-pressure accumulator, with the result that the low-pressure accumulator is prevented from being completely emptied.
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