Apparatus for estimating valve-clearance of an electro-magnetically operated valve and valve-operation controller for the electro-magnetically operated valve
US6554248B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 2001 |
| Grant date | Apr 29, 2003 |
| Priority date | — |
| Expiry date | Aug 15, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L9/20
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A valve-clearance estimating apparatus estimates a valve-clearance that is a minute spacing between a valve drive element, and a valve element, which form an essential part of a moving body of an electro-magnetically operated valve. A position sensor determining an instant position of the valve drive element, a mass-change estimating portion estimate the mass of the moving body moving together with the valve drive element, and a valve-clearance estimating portion estimates the valve-clearance on the basis of a given position of the valve drive element determined by the position sensor at a time when a change in the mass of the moving body is estimated and when the valve drive element reaches proximate to one of its extreme positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.