Valve control system for electromagnetic valve
US6497205B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 21, 2001 |
| Grant date | Dec 24, 2002 |
| Priority date | — |
| Expiry date | May 21, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L9/20
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A valve control system for controlling an electromagnetic valve unit is arranged to execute an initialization control for moving a movable member to a start position by alternatively energizing valve opening and closing electromagnets according to a natural frequency of a vibration system of the electromagnetic valve unit. The valve control system detects amplitudes of oscillation of the movable member during the initialization control and calculates an increase-degree of the detected amplitudes. Further, the valve control system estimates a friction quantity of the vibration system on the basis of the calculated increase-degree and controls electric current supplied to the electromagnets on the basis of a control parameter reflecting the estimated friction quantity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.