Failure detecting apparatus
US7540572B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 2005 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | Dec 25, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T13/142
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A failure detecting apparatus for detecting a failure of a solenoid-operated control valve having a coil, a valve chamber, and a movable member which is movable, while changing a volume of the valve chamber, by an electromagnetic drive force produced upon supplying of an electric current to the coil, so that the solenoid-operated control valve is selectively placed in one of an open state thereof and a closed state thereof, the failure detecting apparatus including a pressure-change detecting device which detects a change of a pressure on at least one of a high-pressure side and a low-pressure side of the solenoid-operated control valve; and a failure detecting portion which detects that the solenoid-operated control valve has failed, when a change of the pressure detected by the pressure-change detecting device upon controlling of the electric current supplied to the coil is smaller than a change of the pressure that results from a change of the volume of the valve chamber caused by a movement of the movable member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.