Control of an electromagnetic steering valve of a camshaft phaser
US6615779B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 20, 2002 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | Mar 20, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L2800/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The movable valve apparatus includes the movable valve mechanism, the hydraulic pressure control valve, and the controller. The movable valve mechanism changes the opening/closing timing of an air intake or exhaust valve depending on the supplied hydraulic pressure of the working fluid. The hydraulic pressure control valve adjusts the supplied hydraulic pressure depending on the working condition of the spool. The controller controls the solenoid that drives the spool. When it is determined that the spool is in the returning state, in which the spool starts moving toward the initial position, the foreign object removal operation is executed. During the foreign removal operation, the spool temporarily reciprocates in order to remove foreign objects in the hydraulic pressure control valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.