초록 ▼

The current through the coil of a solenoid valve is monitored for a deflection which is generated when the valve armature shifts in response to the current being applied to the coil. A lack of detection of the deflection is indicative of a solenoid malfunction and causes generation of an alarm signa

The current through the coil of a solenoid valve is monitored for a deflection which is generated when the valve armature shifts in response to the current being applied to the coil. A lack of detection of the deflection is indicative of a solenoid malfunction and causes generation of an alarm signal.

대표청구항 ▼

[ What is claimed is:] [1.] 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 t

[ What is claimed is:] [1.] 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.