IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0667584
(2008-06-04)
|
등록번호 |
US-8322800
(2012-12-04)
|
우선권정보 |
FR-07 04813 (2007-07-02) |
국제출원번호 |
PCT/EP2008/056883
(2008-06-04)
|
§371/§102 date |
20100104
(20100104)
|
국제공개번호 |
WO2009/003781
(2009-01-08)
|
발명자
/ 주소 |
- Anderson, Chris
- Sprocq, Raynald
- Charpentier, Carole
|
출원인 / 주소 |
|
대리인 / 주소 |
Michael Best & Friedrich LLP
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
1 |
초록
▼
The invention relates to a braking control system for automotive vehicles comprising a braking control member (1), a brake booster (4) and a brake master cylinder (5). The system of the invention further comprises a simulator (3) coupled pneumatically to the piston (42) of the brake booster (4). Sai
The invention relates to a braking control system for automotive vehicles comprising a braking control member (1), a brake booster (4) and a brake master cylinder (5). The system of the invention further comprises a simulator (3) coupled pneumatically to the piston (42) of the brake booster (4). Said simulator (3) receives at least one braking command from the braking control member (1) and makes it possible to establish, in return, a difference in pressure between the front chamber (40) and the rear chamber (41) of the brake booster so as to control the displacement of the piston (42). Application: Brakes for automotive vehicles.
대표청구항
▼
1. Braking control system for automotive vehicles comprising a braking control member (1), a brake booster (4) which comprises a vacuum chamber (40) and a working chamber (41) separated by a servomotor piston (42), said brake booster (4) being operable to provide increased braking control according
1. Braking control system for automotive vehicles comprising a braking control member (1), a brake booster (4) which comprises a vacuum chamber (40) and a working chamber (41) separated by a servomotor piston (42), said brake booster (4) being operable to provide increased braking control according to the difference in pressure existing between said two chambers, a brake master cylinder (5) receiving increased braking commands from the brake booster (4) and producing a braking pressure in the hydraulic braking circuit (6) of the vehicle, the system further comprising a simulator (3) coupled one of pneumatically and hydraulically to the piston (42) of the brake booster (4), said simulator (3) receiving at least one braking command from the braking control member (1) and being operable to one of establish and monitor, in return, a difference in pressure between the vacuum chamber (40) and the working chamber (41) of the brake booster so as to control the displacement of the piston (42) characterized in that said simulator (3) comprises a hydraulically controlled pneumatic three-way valve operable to: the event of a braking command initiated by the braking control member (1), to put the working chamber (41) in communication with a greater pressure than that of the vacuum chamber (40) to control operation of the brake booster and, as a result, actuation of the master cylinder (5), andwhen the pressure in the hydraulic braking circuit (6) of the vehicle exceeds a pressure threshold, to stop the communication of the working chamber (41) with said pressure which is greater than that of the vacuum chamber, characterized in that a control piston (31) is hydraulically controlled by the braking control member (1) and operable to control displacement of a probe (32), characterized in that the three-way valve comprises:an axially mobile probe (32),an axially mobile check valve (33), capable of bearing against said mobile probe (32),an axially mobile check valve seat (34), capable of bearing against the check valve (33),the mobile probe (32) being controlled by the braking control member (1) so as to move away from the check valve (33) and thus put the working chamber (41) in communication with atmospheric pressure, and said check valve seat (34) being controlled by the pressure prevailing in the hydraulic braking circuit (6) to move away from said check valve (33) and permit said check valve to move toward the mobile probe (32) and to interrupt the communication of the working chamber (41) with atmospheric pressure when the pressure in the braking circuit exceeds said pressure threshold. 2. Braking control system according to claim 1 characterized in that said check valve seat (34) one of is carried by an axially mobile bushing (340) and forms part of said bushing, a first spring (R3) being operable to exert a first force on said bushing to push said bushing toward the check valve (33), said bushing being mobile in a first pressure admission chamber (35) which is hydraulically coupled to the hydraulic braking circuit (6) of the vehicle and which is brought to the pressure which prevails in the hydraulic braking circuit, so that said pressure exerts on the bushing (340) a second force counter to the first force exerted by the first spring. 3. Braking control system according to claim 2, characterized in that at least one second spring (R21) provides a third force tending to oppose the axial displacement of said probe (32) under the control of the braking control member. 4. Braking control system according to claim 3, characterized in that a third spring (R22) having an elasticity which is different from that of the second spring (R21) provides a fourth force which tends, in combination with the force of the second spring, to oppose the axial displacement of said probe (32) under the control of the braking control member. 5. Braking control system according to claim 4, characterized in that the axially mobile probe (32) comprises a control shaft (320) having a bearing element (321) on which said second and third springs (R21, R22) exert their forces which tend to oppose the axial displacement of said probe (32). 6. Braking control system according to claim 5, characterized in that a control piston (31) is hydraulically controlled by the braking control member (1) and operable to control the displacement of said probe (32). 7. Braking control system according to claim 6, characterized in that an actuating device (7) comprises an actuating chamber (71) in which an actuating piston (70), controlled by the control member (1), slides, said control piston (31) being coupled hydraulically to said actuating chamber (71) by a stop valve (79) so that: in a first operating mode, said stop valve permits the actuating piston (70) to control the displacement of the control piston (31),and, in a second operating mode, said stop valve prevents the actuating piston (70) from controlling displacement of the control piston (31), the actuating piston (70) thus hydraulically controlling displacement of a control rod (73) which acts on a primary piston (50) of the master cylinder (5). 8. Braking control system according to claim 7, characterized in that said control rod (73) acts on the servomotor piston (42), which acts on the primary piston of the master cylinder. 9. Braking control system according to claim 8, characterized in that the brake master cylinder comprises a primary piston which comprises an annular piston (57) which is controlled by the brake servo piston (42) and a central piston (58) which slides in the annular piston (57) and which is controlled by the control member (1) without the intervention of the brake servo piston (42). 10. Braking control system according to claim 9, characterized in that a control rod (73) is actuated hydraulically by the actuating piston (70) and operable to act on the servomotor piston (42). 11. Braking control system according to claim 10, characterized in that the control rod (73) is mechanically coupled to the central piston (58) and comprises a shoulder (74) not intended to be in contact with the servomotor piston (42) of a pneumatically assisted braking system when the three-way valve of the simulator is in a state of braking equilibrium and intended to press against the servomotor piston (42) one of during non-assisted braking and beyond braking saturation of the pneumatic brake booster during assisted braking. 12. Braking control system according to claim 1, characterized in that a control piston (31) is hydraulically controlled by the braking control member (1) and which operable to control displacement of a probe (32). 13. Braking control system according to claim 12, characterized in that an actuating device (7) comprises an actuating chamber (71) in which an actuating piston (70), controlled by the control member (1), slides, said control piston (31) being coupled hydraulically to said actuating chamber (71) by a stop valve (79) so that: in a first operating mode, said stop valve permits the actuating piston (70) to control the displacement of the control piston (31),and, in a second operating mode, said stop valve prevents the actuating piston (70) from controlling the displacement of the control piston (31), the actuating piston (70) thus hydraulically controlling displacement of a control rod (73) which acts on a primary piston (50) of the master cylinder (5). 14. Braking control system according to claim 1, characterized in that the brake master cylinder comprises a primary piston which comprises an annular piston (57) which is controlled by the brake servo piston (42) and a central piston (58) which slides in the annular piston (57) and which is controlled by the control member (1) without the intervention of the brake servo piston (42). 15. Braking control system for automotive vehicles comprising a braking control member (1), a brake booster (4) which comprises a vacuum chamber (40) and a working chamber (41) separated by a servomotor piston (42), said brake booster (4) being operable to provide increased braking control according to the difference in pressure existing between said two chambers, a brake master cylinder (5) receiving increased braking commands from the brake booster (4) and producing a braking pressure in the hydraulic braking circuit (6) of the vehicle, the system further comprising a simulator (3) coupled one of pneumatically and hydraulically to the piston (42) of the brake booster (4), said simulator (3) receiving at least one braking command from the braking control member (1) and being operable to one of establish and monitor, in return, a difference in pressure between the vacuum chamber (40) and the working chamber (41) of the brake booster so as to control the displacement of the piston (42) characterized in that said simulator (3) comprises a hydraulically controlled pneumatic three-way valve operable to: the event of a braking command initiated by the braking control member (1), to put the working chamber (41) in communication with a greater pressure than that of the vacuum chamber (40) to control operation of the brake booster and, as a result, actuation of the master cylinder (5), andwhen the pressure in the hydraulic braking circuit (6) of the vehicle exceeds a pressure threshold, to stop the communication of the working chamber (41) with said pressure which is greater than that of the vacuum chamber, characterized in that a control piston (31) is hydraulically controlled by the braking control member (1) and operable to control displacement of a probe (32), characterized in that an actuating device (7) comprises an actuating chamber (71) in which an actuating piston (70), controlled by the control member (1), slides, said control piston (31) being coupled hydraulically to said actuating chamber (71) by a stop valve (79) so that:in a first operating mode, said stop valve permits the actuating piston (70) to control the displacement of the control piston (31),and in a second operating mode, said stop valve prevents the actuating piston (70) from controlling the displacement of the control piston (31), the actuating piston (70) thus hydraulically controlling displacement of a control rod (73) which acts on a primary piston (50) of the master cylinder (5). 16. Braking control system according to claim 15, characterized in that said control rod (73) acts on the servomotor piston (42), which acts on the primary piston of the master cylinder. 17. Braking control system according to claim 16, characterized in that the brake master cylinder comprises a primary piston which comprises an annular piston (57) which is controlled by the brake servo piston (42) and a central piston (58) which slides in the annular piston (57) and which is controlled by the control member (1) without the intervention of the brake servo piston (42). 18. Braking control system for automotive vehicles comprising a braking control member (1), a brake booster (4) which comprises a vacuum chamber (40) and a working chamber (41) separated by a servomotor piston (42), said brake booster (4) being operable to provide increased braking control according to the difference in pressure existing between said two chambers, a brake master cylinder (5) receiving increased braking commands from the brake booster (4) and producing a braking pressure in the hydraulic braking circuit (6) of the vehicle, the system further comprising a simulator (3) coupled one of pneumatically and hydraulically to the piston (42) of the brake booster (4), said simulator (3) receiving at least one braking command from the braking control member (1) and being operable to one of establish and monitor, in return, a difference in pressure between the vacuum chamber (40) and the working chamber (41) of the brake booster so as to control the displacement of the piston (42) characterized in that said simulator (3) comprises a hydraulically controlled pneumatic three-way valve operable to: the event of a braking command initiated by the braking control member (1), to put the working chamber (41) in communication with a greater pressure than that of the vacuum chamber (40) to control operation of the brake booster and, as a result, actuation of the master cylinder (5), andwhen the pressure in the hydraulic braking circuit (6) of the vehicle exceeds a pressure threshold, to stop the communication of the working chamber (41) with said pressure which is greater than that of the vacuum chamber, characterized in that a control piston (31) is hydraulically controlled by the braking control member (1) and operable to control displacement of a probe (32), characterized in that the brake master cylinder comprises a primary piston which comprises an annular piston (57) which is controlled by the brake servo piston (42) and a central piston (58) which slides in the annular piston (57) and which is controlled by the control member (1) without the intervention of the brake servo piston (42). 19. Braking control system according to claim 18, characterized in that a control rod (73) is actuated hydraulically by the actuating piston (70) and operable to act on the servomotor piston (42). 20. Braking control system according to claim 19, characterized in that the control rod (73) is mechanically coupled to the central piston (58) and comprises a shoulder (74) not intended to be in contact with the servomotor piston (42) of a pneumatically assisted braking system when the three-way valve of the simulator is in a state of braking equilibrium and intended to press against the servomotor piston (42) one of during non-assisted braking and beyond braking saturation of the pneumatic brake booster during assisted braking.
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