Brake assist device and motor vehicle comprising such a device
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60T-013/68
B60T-013/74
출원번호
US-0993789
(2011-12-12)
등록번호
US-9505390
(2016-11-29)
우선권정보
FR-10 04900 (2010-12-15)
국제출원번호
PCT/EP2011/072422
(2011-12-12)
§371/§102 date
20131030
(20131030)
국제공개번호
WO2012/080157
(2012-06-21)
발명자
/ 주소
Richard, Philippe
Gaffe, Francois
Cagnac, Bastien
출원인 / 주소
Robert Bosch GmbH
대리인 / 주소
Norton Rose Fulbright US LLP
인용정보
피인용 횟수 :
1인용 특허 :
2
초록▼
A brake-assist device for a motor vehicle having a servomotor is described. A servomotor has a plunger piston, a moving part, and an arrangement to move the moving part into position with respect to the plunger piston. The servomotor is actuated by a control rod. The control rod has a first end that
A brake-assist device for a motor vehicle having a servomotor is described. A servomotor has a plunger piston, a moving part, and an arrangement to move the moving part into position with respect to the plunger piston. The servomotor is actuated by a control rod. The control rod has a first end that presses upon the plunger piston and a second end to receive a force exerted by a brake pedal intended to be moved by a driver of the vehicle. The servomotor includes a sensor interposed in a contact space between the plunger piston and the moving part. A spring is compressed between the plunger piston and the moving part. The servomotor includes an arrangement for displacing the plunger piston in the contact space based on the driving mode. A stiffness of the spring is sufficiently high for an onset of braking to occur only with a striking force that is significantly higher during a reactive driving mode than it is during a calm driving mode.
대표청구항▼
1. A brake-assist device for a motor vehicle, comprising: a servomotor including: a plunger piston, anda moving part that moves into a position relative to the plunger piston;a control rod that activates the servomotor, wherein the control rod presses, at a first end, on the plunger piston, and rece
1. A brake-assist device for a motor vehicle, comprising: a servomotor including: a plunger piston, anda moving part that moves into a position relative to the plunger piston;a control rod that activates the servomotor, wherein the control rod presses, at a first end, on the plunger piston, and receives, at a second end, a force exerted by a brake pedal, the force received being proportional to an origination force exerted by a driver of the vehicle;a component situated in the servomotor and in a contact space between the plunger piston and the moving part;a spring between the plunger piston and the moving part, the spring having a stiffness level and a compression; andan arrangement, situated in the servomotor, that, as a function of a driving mode, (i) varies the compression of the spring, (ii) displaces the plunger piston in the contact space, and (iii) displaces the component in the contact space, wherein the arrangement includes a control unit having a processing device configured to execute a program that determines, based on a selection of the driving mode, how the compression is varied,wherein a striking force that is returned to the driver at the brake pedal is based on the stiffness level and the compression of the spring, and wherein the stiffness level of the spring is selected such that when the driving mode is: a reactive driving mode, a braking is onset only when the striking force is at least of a first magnitude,a calm driving mode, the braking is onset only when the striking force is at least of a second magnitude that is lower than the first magnitude. 2. The device according to claim 1, wherein the stiffness level of the spring is between 11 and 22 N/mm. 3. The device according to claim 1, wherein, during a transition from the reactive braking mode to the calm driving mode, the first magnitude is at least 50% greater than the second magnitude. 4. The device according to claim 1, further comprising: a ball screw assembly for compressing the spring, the ball screw assembly transforming a rotational movement of a ball that forms a rotor of an electric motor into a translational movement of a screw, wherein the screw displaces the moving part and the spring resists a coming together of the plunger piston and the moving part. 5. The device according to claim 1, further comprising a force sensor placed at a longitudinal end of the spring. 6. The device according to claim 1, wherein the braking is supplemented during the calm driving mode with a second boost in the calm mode that exceeds a first boost, if any, provided in the reactive driving mode. 7. The device according to claim 1, wherein the stiffness level of the spring is greater than or equal to 30 N/mm. 8. The device according to claim 1, further comprising an arrangement that detects a displacement of the plunger piston relative to the moving part. 9. The device according to claim 1, wherein the component that is situated in the contact space is movable relative to at least one of: (i) the moving part and (ii) a reaction disc connected to a thrust rod of the servomotor. 10. The device according to claim 9, further comprising a movement sensor that detects at least one of: (i) a movement of the moving part, (ii) a movement of the plunger piston, and (iii) a movement of the moving part relative to the plunger piston. 11. The device according to claim 10, wherein residual axial play between at least one of: (i) the reaction disc and the component and (ii) the component and the plunger piston, is adjusted based on movement values detected by the movement sensor. 12. The device according to claim 1, wherein the control unit has a program to one of: (i) delay a return of the moving part to an equilibrium position and (ii) release the brake pedal. 13. The device according to claim 1, wherein the driving mode is one of: (i) preselected or (ii) determined based on a speed of the vehicle. 14. A motor vehicle, comprising: a master cylinder actuated by a brake pedal;an electric brake-assist servomotor between the master cylinder and a control rod;a servomotor control unit;brakes hydraulically connected to the master cylinder; anda booster device that includes: the servomotor, wherein the servomotor includes: a plunger piston,a moving part that moves into a position relative to the plunger piston;the control rod that activates the servomotor, wherein the control rod presses, at a first end, on the plunger piston, and receives, at a second end, a force exerted by the brake pedal, the force received being proportional to an origination force exerted by a driver of the vehicle;a component situated in the servomotor and in a contact space between the plunger piston and the moving part;a spring between the plunger piston and the moving part, the spring having a stiffness level and a compression; andan arrangement, situated in the servomotor, that as a function of a driving mode, (i) varies the compression of the spring, (ii) displaces the plunger piston in the contact space, and (iii) displaces the component in the contact space, wherein the arrangement communicates with the servomotor control units to execute a program that determines, based on a selection of the driving mode, how the compression is varied,wherein a striking force that is returned to the driver at the brake pedal is based on the stiffness level and the compression of the spring, and wherein the stiffness level of the spring is selected such that when the driving mode is: a reactive driving mode, a braking is onset only when the striking force is at least of a first magnitude,a calm driving mode, the braking is onset only when a the striking force is at least of a second magnitude that is lower than the first magnitude. 15. The motor vehicle of claim 14, wherein, based on the selection of the driving mode, the control unit executes an instruction that controls a rotation of a rotor in a direction such that the moving part is moved towards the master cylinder. 16. The motor vehicle of claim 14, wherein, based on the selection of the driving mode, the control unit executes an instruction that controls a rotation of a rotor in a direction such that the moving part is moved toward the control rod. 17. The device according to claim 14, wherein the selection of the driving mode is provided by a data memory of the control unit.
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