Electromotive sensor
US4941348A · kind A · utility
11Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1989 |
| Grant date | Jul 17, 1990 |
| Priority date | — |
| Expiry date | Mar 28, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P13/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The circuit senses abrupt change in motion of an electromotively-driven part such as the onset of valve seating in a solenoid-operated valve. A constant current source supplies power to the solenoid coil and a pulse detector circuit monitors the voltage across the coil and determines the time rate of change of that voltage. A change in the algebraic sign of the time rate of change in voltage indicates that valve seating has occurred.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.