Vehicle skid control system
US4673226A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1985 |
| Grant date | Jun 16, 1987 |
| Priority date | — |
| Expiry date | Feb 19, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S303/08
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In accordance with the present invention, a normally open isolation valve is connected between a master cylinder and the selected wheel brakes, and a normally closed dump valve is connected between the selected wheel brakes and a fluid accumulator. A computer control module is connected to operate the isolation valve and the dump valve. In operation, when a slip condition of the controlled wheels is detected, the computer control module closes the isolation valve to hold fluid pressure to the controlled brakes at a relatively constant level. If the deceleration of the controlled wheels exceeds a predetermined amount, the computer control module will selectively open the dump valve to enable fluid to flow into the accumulator, thereby reducing the deceleration of the associated wheels. After the isolation valve has been closed and the slip condition is corrected, the computer control module can detect when the vehicle travels from a low friction surface such as wet asphalt to a high friction surface such as a dry concrete, because the braked wheels of the vehicle which are not controlled by the skid control system will cause an increase in deceleration of the vehicle. Under these co…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.