초록 ▼

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 en

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.

대표청구항 ▼

[ What is claimed is:] [1.] A device for detecting a fault in a solenoid valve comprising:a solenoid valve coil having first and second coil ends;a feeding system for supplying a drive current to said solenoid valve coil, said feeding system comprising:a grounded battery,a first switch electrically

[ What is claimed is:] [1.] A device for detecting a fault in a solenoid valve comprising:a solenoid valve coil having first and second coil ends;a feeding system for supplying a drive current to said solenoid valve coil, said feeding system comprising:a grounded battery,a first switch electrically connected between said first coil end and said grounded battery, anda second switch electrically connected between said second coil end and a ground;a test electric power supply system electrically connected to said first coil end, said test electric power supply system being operable to provide a micro test current to said solenoid valve coil when the drive current to said solenoid valve coil is cut off; anda controller being operable to control said first and second switches and operable to detect a fault in said feeding system on the basis of a voltage supplied to said second coil end.