Antilock brake system with step-down release control
US5106171A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Aug 9, 1990 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Aug 9, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/50
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The current to the motor of a motor driven pressure modulator of an antilock brake system is controlled at a high value in response to a sensed incipient wheel lock condition so as to rapidly release the brake pressure for a calibrated time period that is a function of wheel parameters to reduce brake pressure by an amount determined to effect a recovery from the incipient wheel lock condition under normal antilock controlled braking. After the calibrated time period, the motor is braked so as to quickly halt its rotation and therefore the rapid pressure reduction by applying a motor brake current to the motor by controlling the motor current in the pressure apply direction. The duration of this rapid reduction of brake pressure and therefore the amount of pressure reduction is independent of a sensed recovery condition of the wheel and is based solely on an open loop calibration value determined to effect wheel recovery from the incipient wheel lock condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.