IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0290107
(2005-11-30)
|
등록번호 |
US-7338136
(2008-03-04)
|
우선권정보 |
JP-2004-364966(2004-12-16); JP-2005-011361(2005-01-19) |
발명자
/ 주소 |
- Nakayama,Masamobu
- Takenouchi,Kazuya
- Takahashi,Hideo
- Ogawa,Sumitaka
- Tani,Kazuhiko
- Nishikawa,Yutaka
|
출원인 / 주소 |
|
대리인 / 주소 |
Carrier, Blackman & Associates, P.C.
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
14 |
초록
▼
An electronic braking device is provided which easily generates a braking force depending on the amount of brake operation in a range in which the amount of brake operation is small, just after the start of brake operation, and which protects a fluid pressure sensor from a fluid pressure beyond its
An electronic braking device is provided which easily generates a braking force depending on the amount of brake operation in a range in which the amount of brake operation is small, just after the start of brake operation, and which protects a fluid pressure sensor from a fluid pressure beyond its tolerance. The electronic braking device activates a brake caliper through an electronic control unit (ECU) according to a signal in response to a braking request from a driver, and is provided with a first pressure sensor and a second pressure sensor for detecting the requested braking amount. The first pressure sensor and the second pressure sensor are different from each other in detection resolution and detection range. A relief valve unit r is provided which, when a fluid pressure above a prescribed level is applied to the master cylinder 3, relieves this fluid pressure.
대표청구항
▼
What is claimed is: 1. A braking device for a vehicle, the braking device comprising: a wheel braking member, a brake operating unit operatively connected to the wheel braking member such that fluid pressure applied to the wheel braking member changes according to the extent of operation of the bra
What is claimed is: 1. A braking device for a vehicle, the braking device comprising: a wheel braking member, a brake operating unit operatively connected to the wheel braking member such that fluid pressure applied to the wheel braking member changes according to the extent of operation of the brake operating unit, a master cylinder operatively connected to the brake operating unit, a fluid loss simulator operatively connected to the master cylinder, the fluid loss simulator capable of applying a hydraulic pseudo reaction force to the master cylinder, a pressure reducing device, and a plurality of fluid pressure sensors for detecting fluid pressure in said master cylinder, wherein said plurality of fluid pressure sensors includes a first fluid pressure sensor and a second fluid pressure sensor; a detection range of said first fluid pressure sensor is lower than that of the second fluid sensor; a detection resolution of said first fluid pressure sensor is higher than that of the second fluid sensor; and wherein when fluid pressure above a prescribed level is applied to said master cylinder, the pressure reducing device relieves the fluid pressure in the master cylinder. 2. The braking device according to claim 1, wherein said second fluid pressure sensor is a high-pressure fluid pressure sensor and said first fluid pressure sensor is a low-pressure fluid pressure sensor. 3. The braking device according to claim 2, wherein the fluid pressure at which said pressure reducing device begins working is set to a performance limit fluid pressure value of one of the plurality of fluid pressure sensors. 4. The braking device according to claim 2, wherein said second fluid pressure sensor for high pressure detection and said first fluid pressure sensor for low pressure detection overlap in their working ranges. 5. The braking device according to claim 1, wherein the braking device further comprises an electromagnetic valve; and a main brake fluid passage that extends between said master cylinder and said braking member, wherein the electromagnetic valve is provided in the main brake fluid passage, and one of said fluid pressure sensors is disposed between said electromagnetic valve and said master cylinder. 6. The braking device according to claim 5, wherein the braking device further comprises a hydraulic modulator connected to the main brake fluid passage, and a hydraulic modulator electromagnetic valve provided between said hydraulic modulator and said wheel braking member, wherein the second fluid pressure sensor is provided between the hydraulic modulator electromagnetic valve and said wheel braking member. 7. The braking device according to claim 1, wherein said fluid pressure sensors are installed in fluid communication with a hydraulic pipe, and wherein said pressure reducing device is located adjacent to one of said plurality of fluid pressure sensors in the hydraulic pipe. 8. An electronic braking device for a vehicle, the braking device comprising a master cylinder, a wheel braking member connected to the master cylinder by a main brake fluid passage, a brake operating unit operatively connected to the wheel braking member such that fluid pressure applied to the wheel braking member changes according to the extent of operation of the brake operating unit, a normally open valve disposed in the main brake fluid passage between the master cylinder and the wheel braking member, a first pressure sensor disposed between the master cylinder and the valve, the first pressure sensor outputting a first detected pressure, a second pressure sensor disposed between the master cylinder and the valve, the second pressure sensor outputting a second detected pressure, a third pressure sensor disposed between the valve and the wheel braking member, a fourth pressure sensor disposed between the valve and the wheel braking member, a controller which controls the valve based on detected pressures of the first pressure sensor and the second pressure sensor, wherein the first pressure sensor detects a pressure range below that of the second pressure sensor; and the third pressure sensor detects a pressure range below that of the fourth pressure sensor. 9. The braking device of claim 8, wherein the first pressure sensor detects a pressure range which is lower in pressure, more narrow in range, and of higher resolution relative to that of the second pressure sensor. 10. The braking device of claim 9, wherein the detection ranges of the first pressure sensor and the second pressure sensor partially overlap. 11. The braking device of claim 8, wherein the braking device further comprises a hydraulic modulator for generating hydraulic pressure in the wheel braking member, the hydraulic modulator connected to the main brake fluid passage between the valve and the wheel braking member, wherein control of the hydraulic modulator is based on the pressures detected by the third pressure sensor and the fourth pressure sensor. 12. An electronic braking device for a vehicle, the braking device comprising: a wheel braking member, a controller which is operable to activate the wheel braking member according to an electronic signal generated in response to a braking request from a driver, and a plurality of input side fluid pressure sensors for detecting a requested braking amount, each of the plurality of sensors providing an individual output signal to the controller, a master cylinder operatively connected to said wheel braking member, and a brake operating unit, wherein the input side fluid pressure sensors are different from each other in detection resolution and detection range, the input side fluid pressure sensors comprising a first fluid pressure sensor operable to detect a low pressure range with high resolution, and a second fluid pressure sensor operable to detect both the low pressure range and a high pressure range, the second fluid pressure sensor detecting with a low resolution compared to that of the first fluid pressure sensor, said requested braking amount corresponds to a fluid pressure in the master cylinder which produces working fluid pressure in conjunction with an operation of the brake operating unit; said input side fluid pressure sensors detect a fluid pressure in said master cylinder, and the braking device further comprises a plurality of output side fluid pressure sensors provided for detecting an applied fluid pressure on said wheel braking member, wherein the output side fluid pressure sensors are different from each other in detection resolution and detection range. 13. The electronic braking device according to claim 1, wherein said sensors are diagnosed for abnormalities based on the result of detection by said sensors. 14. A braking device for a vehicle, the braking device comprising a wheel braking member, a brake operating unit operatively connected to said wheel braking member via a main passage, a fluid pressure sensor for detecting a fluid pressure applied to said wheel braking member, and a pressure reducing device, the pressure reducing device comprising a housing, the housing comprising a first receptacle that includes a relief valve, a second receptacle that includes an accumulator, and an internal passage connecting the first receptacle and said second receptacle, the relief valve configured to permit the internal passage to communicate with the main passage under predetermined conditions, wherein the fluid pressure applied to the wheel braking member changes according to the extent of operation of the brake operating unit, and wherein when a prescribed fluid pressure is applied to said wheel braking member, the pressure reducing device relieves the fluid pressure in said wheel braking member. 15. An electronic braking device for a vehicle, the braking device comprising: a wheel braking member, a controller which is operable to activate the wheel braking member according to an electronic signal generated in response to a braking request from a driver, a plurality of sensors for detecting a requested braking amount, and a master cylinder operatively connected with said wheel braking member, wherein the sensors are different from each other in detection resolution and detection range, the sensors detect a fluid pressure in said master cylinder, and the sensors include at least fluid pressure sensors for low pressure and fluid pressure sensors for high pressure; and when the fluid pressure is below a prescribed level, the result of detection by a fluid pressure sensor for low pressure is used by the controller, and when the fluid pressure is above the prescribed level, the result of detection by a fluid pressure sensor for high pressure is used by the controller. 16. A braking device for a vehicle, the braking device comprising: a wheel braking member, a brake operating unit operatively connected to the wheel braking member such that a fluid pressure applied to the wheel braking member changes according to the extent of operation of the brake operating unit, a master cylinder interlocked with the brake operating unit, a main brake fluid passage formed between the master cylinder and the wheel braking member, an electromagnetic valve disposed in the main brake fluid passage, a fluid loss simulator operatively connected to the master cylinder, the fluid loss simulator capable of applying a hydraulic pseudo reaction force to the master cylinder, a first pressure reducing device connected to the main brake fluid passage formed between the valve and the master cylinder, a first fluid pressure sensor for detecting the fluid pressure in said master cylinder, the first fluid pressure sensor connected to the main brake fluid passage between the valve and the master cylinder, a second pressure reducing device connected to the main brake fluid passage between the valve and the wheel braking member, and a second fluid pressure sensor for detecting the fluid pressure in the wheel braking member, the second fluid pressure sensor connected to the main brake fluid passage in an area between the valve and the braking member; wherein each of said first pressure reducing device and said second pressure reducing device includes a housing, the housing comprising a first receptacle that includes a relief valve, a second receptacle that includes an accumulator, and an internal passage connecting the first receptacle and said second receptacle, the relief valve configured to permit the internal passage to communicate with the main brake fluid passage under predetermined conditions; and each of said first pressure reducing device and said second pressure reducing device is configured to prevent input of a fluid pressure higher than a respective prescribed fluid pressure.
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