Method and apparatus for checking operation of solenoid
US5243296A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1991 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Oct 18, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/72
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
When a solenoid has been turned on by supplying current to a coil thereof, the solenoid operation is checked by temporarily ceasing the supply of current to the coil to temporarily deenergize the solenoid. The current flowing in the coil is detected while the solenoid is temporarily deenergized, and the characteristics of the thus detected current are used to discriminate the position of a movable iron core of the solenoid. On the other hand, when the solenoid has been turned off by ceasing the supply of current to the coil, the solenoid operation is checked by temporarily supplying current to the coil to thereby temporarily energize the solenoid. The current flowing in the coil while the solenoid is temporarily energized is detected, and the characteristics of the thus detected coil current are used to determine the position of the movable iron core of the solenoid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.