Device for detecting fault in solenoid valve

Details Device for detecting fault in solenoid valve Device for detecting fault in solenoid valve

1998-02-18

2000-11-14

Metjahic, Safet

Electricity: measuring and testing

Electromechanical switching device

418546, G01R 3102, G01R 3108

Patent

active

061474983

ABSTRACT:
A device for detecting a fault in a solenoid valve prevents a feeding system from supplying a drive current to a solenoid valve coil which actuates the solenoid valve from being damaged at the time of detection of the fault. The feeding system is provided with a first switch installed between one end of the solenoid valve coil and a battery, a second switch installed between the other end of the solenoid valve coil and a ground, and a plurality of wires for connecting the battery, the first and second switches and the solenoid valve coil. A test power supply system is connected to one end or the other end of the solenoid valve coil and supplies a micro test current to the solenoid valve coil when a current from the battery to the solenoid valve coil is cut off. A controller controls an operation of the first and second switches, and detects a fault in the feeding system on the basis of a voltage at the end of the solenoid valve coil opposite the end which the test power supply system is connected in accordance with the operating state.

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