Patent
Pressure transmitter for brake control system
| العنوان: | Pressure transmitter for brake control system |
|---|---|
| Patent Number: | 5,372,412 |
| تاريخ النشر: | December 13, 1994 |
| Appl. No: | 07/983,428 |
| Application Filed: | December 02, 1992 |
| مستخلص: | A pressure transmitter for a brake control system is provided with a piston having a passage extending between an input pressure chamber and an output pressure chamber and a seal fixedly installed on one end of the piston for sealing closing an end of the passage. The seal is resiliently deformable for transmission of pressure between the input pressure chamber and the output pressure chamber. A pressure control valve for a brake control system includes a valve spool for controlling communication between a pressure source and a wheel cylinder for producing a control pressure which is boosted on the basis of a master cylinder pressure and a vehicle running condition, a set of plungers for urging the valve spool in the direction of increasing the control pressure in response to increase of the master cylinder pressure and a solenoid for urging in the valve spool in the direction of causing decrease of the control pressure in response to increase of current supplied to the solenoid. |
| Inventors: | Yagi, Eiji (Ayase, JPX) |
| Assignees: | Nissan Motor Co., Ltd. (Yokohama, JPX) |
| Claim: | What is claimed is |
| Claim: | 1. A brake control system for a vehicle comprising |
| Claim: | a master cylinder for producing a master cylinder pressure in response to a manual braking operation; |
| Claim: | a pressure source; |
| Claim: | controller means for detecting a magnitude of the master cylinder pressure and a vehicle running condition and producing an electrical control signal representative thereof; |
| Claim: | pressure control valve means fluidly connected to said pressure source and responsive to the control signal for producing a control pressure variable with variation of the master cylinder pressure and the vehicle running condition; |
| Claim: | a wheel cylinder; |
| Claim: | first passage means for supplying the master cylinder pressure from said master cylinder to said wheel cylinder; |
| Claim: | second passage means for supplying the control pressure from said pressure control valve to said wheel cylinder; and |
| Claim: | first directional control valve means operatively connected to said first passage means for normally preventing supply of the master cylinder pressure to said wheel cylinder and permitting said supply of the master cylinder pressure at the time of failure of said controller means and said pressure control valve means. |
| Claim: | 2. A brake control system according to claim 1, further comprising second directional control valve means operative by connected to said second passage means for normally permitting supply of the control pressure to said wheel cylinder and preventing said supply of the control pressure at the time of failure of said controller means and said pressure control valve means. |
| Claim: | 3. A brake control system according to claim 1, wherein said pressure control valve means comprises a valve spool for controlling communication between said pressure source and said wheel cylinder and plunger means for urging said valve spool in the direction of causing increase of the control pressure. |
| Claim: | 4. A brake control system according to claim 3, wherein said pressure control valve means further comprises solenoid means for urging said valve spool in the direction of causing decrease of said control pressure. |
| Claim: | 5. A brake control system according to claim 4, wherein the signal from said control means is supplied to said solenoid for controlling energization of said solenoid for thereby controlling decrease of said control pressure through control of current supplied to said solenoid. |
| Claim: | 6. A brake control system according to claim 5, wherein said pressure control valve means comprises third passage means for supplying a pressure of said pressure source to said valve spool for thereby urging said valve spool in the direction of causing increase of said control pressure, and third directional control valve means operatively connected to said third passage means for controlling communication between said pressure source and said pressure control valve means, said controller means producing an electrical control signal representative of only the vehicle running condition and supplying it to said third directional control valve means for thereby controlling operation of said third directional control valve means with relation to the vehicle running condition but without relation to the master cylinder pressure. |
| Claim: | 7. A brake control system for a vehicle comprising |
| Claim: | an electrical controller for detecting a magnitude of the master cylinder pressure and a vehicle running condition and producing a first electrical control signal representative of both the master cylinder pressure and the vehicle running condition and a second electrical control signal representative of only the vehicle running condition; |
| Claim: | a solenoid operated pressure control valve; |
| Claim: | circuit means responsive to the second electrical control signal from said controller for providing controlled communication between said pressure source and said pressure control valve; |
| Claim: | said pressure control valve being responsive to the first electrical control signal from said controller for producing a control pressure variable with variation of the master cylinder pressure and the vehicle running condition; |
| Claim: | a first directional control valve operatively connected to said first passage means for normally preventing supply of the master cylinder pressure to said wheel cylinder and permitting said supply of the master cylinder pressure at the time of failure of said controller, said circuit means, and said pressure control valve. |
| Claim: | 8. A brake control system according to claim 7, further comprising a second directional control valve operatively connected to said second passage means for normally permitting supply of the control pressure to said wheel cylinder and preventing said supply of the control pressure at the time of failure of said controller and said pressure control valve. |
| Claim: | 9. A brake control system according to claim 8, wherein said circuit means comprises third passage means fluidly connecting between said pressure source and said pressure control valve, and |
| Claim: | a third directional control valve operatively connected to said third passage means and responsive to the second electrical control signal from said controller. |
| Current U.S. Class: | 3031/152; 303/92; 3031/171; 303DIG2; 303DIG4 |
| Current International Class: | B60T 1536 |
| Patent References Cited: | 3286734 November 1966 Hartshorne 3936095 February 1976 Every 4940295 July 1990 Adachi et al. 5106170 April 1992 Matsuda et al. 5114216 May 1992 Tsuda et al. 5150951 September 1992 Leiber et al. 5172963 December 1992 Brown 5221126 June 1993 Inoue |
| Primary Examiner: | Graham, Matthew C. |
| Attorney, Agent or Firm: | Foley & Lardner |
| رقم الانضمام: | edspgr.05372412 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |