Device for detecting fault in solenoid valve
US6147498A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1998 |
| Grant date | Nov 14, 2000 |
| Priority date | — |
| Expiry date | Feb 18, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/72
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.