Multiple control circuit
US5001641A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 1990 |
| Grant date | Mar 19, 1991 |
| Priority date | — |
| Expiry date | Jun 19, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T2270/402
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An improved multiple control circuit is for use with an anti-lock brake control assembly. It includes a plurality of control logic circuits and an output decision circuit. The control circuits simultaneously receive redundant sensor signals representative of wheel speeds and carry out logical operations based upon the input signals to simultaneously transmit redundant command signals to control the brake pressure of the wheels. Such output signals are not directly sent to actuators, such as brake pressure control valves, but are instead sent through the output decision circuit. If the command signals of the control circuits should be different for some reason, the output decision circuit selects and transmits to the actuators the command signals to control the automobile in the safest manner based upon AND logic and OR logic. Each control circuit is connected to a comparator which compares the output signals of the control circuit with those of the output decision circuit. If there is a discrepancy between the signals and if such a discrepancy persists for a predetermined period of time, a failsafe signal is produced to disable the anti-lock brake control system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.