Solenoid valve failure detecting apparatus
US5153522A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 1991 |
| Grant date | Oct 6, 1992 |
| Priority date | — |
| Expiry date | Jun 28, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/2829
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An apparatus for detecting a failure in a solenoid valve having an electrical winding electromagnetically coupled with a plunger. The failure detecting apparatus comprises a current sensor sensitive to a current through the electrical winding for producing a signal indicative of a sensed winding current. Changes in the sensed winding current indication signal with time are monitored to provide a failure signal which indicates a failure in the solenoid valve when no inflection point exists in the change of the sensed winding current indication signal for a predetermined period of time after power is supplied to the electrical winding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.