Control and delivery of hydraulic fluid in vehicle braking system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60T-013/14
B60T-013/58
B60T-008/38
B60T-008/48
출원번호
US-0906742
(2013-05-31)
등록번호
US-9969374
(2018-05-15)
발명자
/ 주소
Khan, Adil
Pate, Steven Otis
Worrel, Peter Francis
Sagan, Clement Newman
출원인 / 주소
Ford Global Technologies, LLC
대리인 / 주소
Kelley, David B.
인용정보
피인용 횟수 :
0인용 특허 :
4
초록▼
A braking system in a hybrid vehicle is provided. The braking system includes a master cylinder having a first outlet, a second outlet, and a piston disposed therein and translatable from a proximal end to a distal end in response to brake pedal displacement. A brake fluid reservoir supplies hydraul
A braking system in a hybrid vehicle is provided. The braking system includes a master cylinder having a first outlet, a second outlet, and a piston disposed therein and translatable from a proximal end to a distal end in response to brake pedal displacement. A brake fluid reservoir supplies hydraulic fluid to the master cylinder. A first fluid circuit connects the first outlet of the master cylinder to the brake fluid reservoir. A second fluid circuit connects the second outlet of the master cylinder to wheel brakes and supplies hydraulic fluid from the master cylinder to the wheel brakes in response to brake pedal displacement. The first outlet of the master cylinder is disposed between the second outlet and the proximal end of the master cylinder such that initial brake pedal displacement transfers brake fluid from the master cylinder to the fluid reservoir to inhibit hydraulic braking during regenerative braking.
대표청구항▼
1. A braking system in a hybrid vehicle, comprising: a brake pedal;a master cylinder having a proximal end and a distal end of a fluid chamber, the master cylinder further having a first outlet, a second outlet between the first outlet and the distal end, and a piston disposed therein and translatab
1. A braking system in a hybrid vehicle, comprising: a brake pedal;a master cylinder having a proximal end and a distal end of a fluid chamber, the master cylinder further having a first outlet, a second outlet between the first outlet and the distal end, and a piston disposed therein and translatable from the proximal end toward the distal end in response to brake pedal displacement;a brake fluid reservoir;a first fluid circuit connecting the first outlet of the master cylinder to the brake fluid reservoir; anda second fluid circuit connecting the second outlet of the master cylinder to wheel brakes and supplying brake fluid from the master cylinder to the wheel brakes in response to the piston being translated a length greater than a distance between the proximal end and the first outlet;wherein initial brake pedal displacement translates the piston between the proximal end and the first outlet and transfers brake fluid from the master cylinder to the fluid reservoir in the first fluid circuit to inhibit hydraulic braking during regenerative braking, and wherein brake fluid is inhibited from transferring from the master cylinder to the fluid reservoir in response to the piston translating past the first outlet to enable hydraulic braking. 2. The braking system of claim 1, further comprising a valve disposed in the first fluid circuit, wherein the valve is biased closed to block fluid return to the brake fluid reservoir. 3. The braking system of claim 2, further comprising at least one controller programmed to open the valve in response to a state of charge of a traction battery. 4. The braking system of claim 2, further comprising at least one controller programmed to open the valve in response to brake pedal position. 5. The braking system of claim 1, wherein the first and second fluid circuits are isolated from one another. 6. The braking system of claim 1, wherein the master cylinder includes a second fluid chamber having a proximal end, a distal end, and a second piston disposed therein, wherein the second fluid chamber defines a third fluid circuit connecting the a third outlet of the second fluid chamber to the fluid reservoir and a fourth fluid circuit connecting a fourth outlet of the second fluid chamber to the wheel brakes. 7. The braking system of claim 6, wherein a first distance is defined between the proximal end of the first chamber and the first outlet, a second distance is defined between the proximal end of the second chamber and the third outlet, wherein the first distance and the second distance are unequal. 8. A hybrid vehicle comprising: a brake pedal;a master cylinder mechanically coupled to the brake pedal and having a piston therein, a first fluid circuit that selectively diverts hydraulic fluid from being supplied to vehicle brakes in response to an initial displacement of the piston, and a second fluid circuit that delivers hydraulic fluid to the vehicle brakes in response to displacement of the piston beyond a fixed initial displacement distance. 9. The hybrid vehicle of claim 8, further comprising a controller programmed to apply a regenerative braking force to vehicle wheels while the piston has translated a distance less than the fixed initial displacement distance. 10. The hybrid vehicle of claim 9, further comprising a valve communicatively coupled to the controller, wherein the controller is programmed to close the valve and inhibit flow of hydraulic fluid in the first fluid circuit in response to a request for an increase of frictional braking force and a decrease in regenerative braking force. 11. The hybrid vehicle of claim 10, wherein the valve is a normally-closed valve. 12. The hybrid vehicle of claim 10, wherein the controller is further programmed to operate the valve in response to traction battery state of charge. 13. The hybrid vehicle of claim 8, wherein the first fluid circuit is isolated from the second fluid circuit. 14. A vehicle comprising: a master cylinder having a chamber with a piston slidably disposed therein and biased toward a proximal end, the chamber defining a first opening fluidly coupling the chamber to a fluid reservoir and located a distance from the proximal end, and a second opening fluidly coupling the chamber to hydraulic-brakes;wherein fluid is inhibited from transferring through the first opening in response to the piston moving the distance from the proximal end. 15. The vehicle of claim 14, wherein fluid is inhibited from transferring through the second opening based on the piston being located between the proximal end and the first opening, and wherein fluid is enabled to transfer through the second opening in response to the piston moving the distance from the proximal end. 16. The vehicle of claim 14, further comprising at least one controller communicatively coupled to a valve disposed between the first opening and the fluid reservoir, the at least one controller programmed to close the valve in response to a request for an increase in frictional braking force and a decrease in regenerative braking force. 17. The hybrid vehicle of claim 14, further comprising a valve disposed within the first fluid circuit to selectively disable fluid flow from the master cylinder to the brake fluid reservoir via the first fluid circuit. 18. The hybrid vehicle of claim 17, further comprising at least one controller programmed to open the valve in response to a traction battery state of charge. 19. The hybrid vehicle of claim 17, further comprising at least one controller programmed to open the valve in response to brake pedal position.
Ullrich, Thorsten; von Albrichsfeld, Christian Albrich; Karner, Jürgen; Führer, Jochen, Method for operating a brake system, brake systems in which the method is carried out and motor vehicles comprising said brakes systems.
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