IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0889832
(2001-10-22)
|
우선권정보 |
DE-0002444 (1999-01-22) |
국제출원번호 |
PCT/EP99/09704
(1999-12-09)
|
국제공개번호 |
WO00/43246
(2000-07-27)
|
발명자
/ 주소 |
- Frentz, Georg
- Woll, Peter
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
3 |
초록
▼
A brake system with hydraulic brake boosting has a hydraulic actuating unit which comprises a hydraulic reservoir, a brake pedal, a brake-pressure generator and a pedal-travel simulator, a hydraulic unit comprising a pressure generator, a hydraulic wheel-brake device and a control unit for coordinat
A brake system with hydraulic brake boosting has a hydraulic actuating unit which comprises a hydraulic reservoir, a brake pedal, a brake-pressure generator and a pedal-travel simulator, a hydraulic unit comprising a pressure generator, a hydraulic wheel-brake device and a control unit for coordinating the functions of the actuating unit, of the hydraulic unit and of the wheel-brake device. The pedal-travel simulator possesses a variable displacement volume which is connected to the hydraulic reservoir via a hydraulic line. In order to design electrohydraulic brakes by simple means so as to be more fail-safe, a return line is provided between the wheel-brake device and the displacement volume of the pedal-travel simulator. Moreover, there is arranged in the hydraulic line, between the hydraulic reservoir and the displacement volume of the pedal-travel simulator, a return-flow valve which in the event of a fault, with the brake system defective, can be shifted into a shut-off position blocking the hydraulic line.
대표청구항
▼
1. Brake system with hydraulic brake boosting comprising a hydraulic actuating unit having a hydraulic reservoir, a brake pedal, a brake pressure generator and a pedal travel simulator with a variable displacement volume, a hydraulic unit comprising a pressure generator; a hydraulic wheel brake devi
1. Brake system with hydraulic brake boosting comprising a hydraulic actuating unit having a hydraulic reservoir, a brake pedal, a brake pressure generator and a pedal travel simulator with a variable displacement volume, a hydraulic unit comprising a pressure generator; a hydraulic wheel brake device; and a control unit for operatively coordinating functions of the actuating unit of the hydraulic unit and of the wheel brake device, wherein the wheel brake device is configured for recirculation of the hydraulic medium and is connected to the displacement volume of the pedal travel simulator by a return line, and the displacement volume of the pedal travel simulator is connected to the hydraulic reservoir, by a hydraulic line to recirculate the hydraulic medium out of the wheel brake device back into the hydraulic reservoir by way of the displacement volume of the pedal travel simulator, and the hydraulic line between the hydraulic reservoir and the displacement volume of the pedal travel simulator includes a return flow valve configured, in the event of a fault from a defective brake system, to be shifted into a shut-off position blocking the hydraulic line. 2. Brake system according to claim 1, wherein the return flow valve is configured to be electrically actuateable, whereby, in a dead state, the return flow valve is in the shut-off position. 3. Brake system as claimed in claim 1, wherein the pedal travel simulator is a hydraulic cylinder with a displaceable adjusting piston for variable setting of the displacement volume. 4. Brake system as claimed in claim 3, wherein the return flow valve is configured to be electrically actuateable, whereby, in a dead state, the return flow valve is in the shut-off position. 5. Brake system as claimed in claim 1, wherein the hydraulic unit is arranged in a flow path between the actuating unit and the wheel brake device. 6. Brake system as claimed in claim 5, wherein the return flow valve is configured to be electrically actuateable, whereby, in a dead state, the return flow valve is in the shut-off position. 7. Brake system as claimed in claim 6, wherein the pedal travel simulator is a hydraulic cylinder with a displaceable adjusting piston for variable setting of the displacement volume. 8. Brake system as claimed in claim 5, wherein the return line is arranged between the hydraulic unit and the displacement volume of the pedal travel simulator. 9. Process for boosting brake force in a brake system as claimed in claim 8, comprising converting pedal travel of a brake pedal into a brake pressure that acts upon a wheel brake device, using the pedal travel to influence a displacement volume of a pedal travel simulator; normally, after the end of a braking operation conveying the hydraulic medium out of the wheel brake device by way of a return line into the displacement volume of the pedal travel simulator and out of the displacement volume of the pedal travel simulator via a hydraulic line into a hydraulic reservoir; and, in the event of a fault during a braking operation, interrupting the hydraulic line between the displacement volume and the hydraulic reservoir and collecting the hydraulic medium of the wheel brake device in the displacement volume of the pedal travel simulator. 10. Process as claimed in claim 9, further comprising maintaining an electrically actuable return flow valve in the hydraulic line between the pedal travel simulator and the hydraulic reservoir in a dead state in a shut-off position to block the flow through the hydraulic line.
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