Hydraulic pressure control system for a vehicle
US5979998A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1998 |
| Grant date | Nov 9, 1999 |
| Priority date | — |
| Expiry date | Feb 27, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S303/901
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The present invention is directed to a hydraulic pressure control system for controlling a hydraulic pressure in each wheel brake cylinder operatively mounted on each wheel of a vehicle, which includes a modulator disposed between a master cylinder and the wheel brake cylinder for introducing thereto and draining therefrom the brake fluid. First and second pump devices are provided for introducing the brake fluid and pressurizing it to discharge the pressurized brake fluid to the wheel brake cylinder through the modulator, respectively. The second pump device has a different suction phase from the suction phase of the first pump device. A changeover valve device is disposed between the master cylinder and the modulator, and adapted to select one of a first operating position for communicating the master cylinder with the modulator and blocking the communication between the master cylinder and the first and second pump devices, and a second operating position for communicating the master cylinder with the first and second pump devices and blocking the communication between the master cylinder and the modulator. First and second check valves are disposed between the changeover valve …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.