Anti skid fault detection circuit
US4109234A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1976 |
| Grant date | Aug 22, 1978 |
| Priority date | — |
| Expiry date | Feb 27, 1996 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/885
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Fault detection circuit which is intended to be included in an anti-skid control system for a braking system of a motor vehicle. The fault detection circuit is coupled between the sensor coil and tachometer portion of the anti-skid control system and detects if the sensor coil becomes: open circuited, shorted to ground, or shorted to a power supply. If any of the aforementioned conditions arise, the fault detection circuit provides an output signal for indicating such a condition to warn the driver of the vehicle that the anti-skid control system is non operative. A low pass RC filter is utilized to limit the input signal amplitude developed across the sensor coil to a constant value which is determined by the time constant of the low pass filter. Upper and lower references voltages can be established and compared to the filter input signal to indicate failure if this voltage developed across the sensor coil approaches either the upper or lower reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.