Electrically operated valve diagnosing method and diagnosing apparatus
US7596457B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 2005 |
| Grant date | Sep 29, 2009 |
| Priority date | — |
| Expiry date | Feb 3, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K37/0083
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The invention diagnoses an electrically operated valve, which is provided with a spring cartridge expanding and contracting in response to a reaction force acting on an axial direction of a worm in a valve element driving section, at both the opening and closing operations of the valve. A correlation between a driving force output signal from the valve element driving section and a driving force from a compression state of the spring cartridge is provided in a database. Then, a correlation between a driving force input signal to the valve element driving section and the driving force output signal is acquired in order to monitor a change in transmission efficiency of the driving force. Then, a driving force corresponding to a measured yoke stress is read out from the database for use in diagnosing the driving force of the electrically operated valve is diagnosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.