Anti-lock brake control circuit
US4037882A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1975 |
| Grant date | Jul 26, 1977 |
| Priority date | — |
| Expiry date | Nov 20, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/17633
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An anti-lock brake control circuit compares the deceleration of a braked wheel with a deceleration reference and integrates the difference when wheel deceleration exceeds the reference deceleration. A resulting velocity error signal is compared with a velocity error reference and a release signal is generated while the velocity error signal exceeds the velocity error reference. Adaptive control is provided by a first order lag circuit having wheel velocity as its input and which supplies a variable portion of the deceleration reference having a slope approximately equal to the slope of the vehicle velocity profile during braking on low coefficient surfaces and having a slope less than the slope of the vehicle velocity profile during braking on high coefficient surfaces. An initial cycle and pulse circuit sets the velocity error reference to a high level for both the first cycle of anti-lock brake operation and for a time period after each brake application during anti-lock brake operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.