Skid control system and method for automotive vehicles
US4183588A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 26, 1978 |
| Grant date | Jan 15, 1980 |
| Priority date | — |
| Expiry date | Apr 26, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/17613
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A skid control system and method for use in conjunction with a vacuum-boosted hydraulic brake system of the type presently used in automotive passenger vehicles. The velocity of each monitored vehicle wheel is sensed and a signal indicative of wheel deceleration is derived. A skid control valve is connected to the vacuum booster of the brake system to vent the booster vacuum chamber to the atmosphere when an excessive wheel deceleration is detected at any one of the monitored wheels and thereby relieve brake pressure at all of the monitored wheels. When the wheel begins to speed back up to vehicle speed, the skid control valve is pulsed by a control signal having a predetermined frequency and having a duty cycle which increases a function of time over a predermined control period. In this manner, the brake pressure at the monitored wheels is gradually increased as a function of time until the brake pressure desired by the vehicle operator is again achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.