Patent ID: 6111514
Filing Date: 2000-08-29
Classification: B60T,G01R

Abstract:
A device for verifying the operation of a solenoid valve coil included in an anti-lock bake system, the device comprising:a sensor adapted to be coupled to the solenoid valve coil, said sensor operable to generate a signal proportional to an electrical characteristic of the coil; anda monitoring device connected to said sensor and the anti-lock brake system, said monitoring device responsive to said sensor signal to generate an alarm signal, said monitoring device being operable to measure the length of time that has elapsed since the solenoid valve coil has been energized and also to monitor a rate of change of said sensor signal during a predetermined time period, said monitoring device being further operable to generate said alarm signal and deactivate the anti-lock brake system when said elapsed time has exceeded said predetermined time period and said rate of change of said sensor signal has been greater than a predetermined threshold throughout said predetermined time period.