Method of controlling a device that varies the valve control times an internal combustion engine, especially of a camshaft adjusting device with hydraulically releaseable start lock
US6516763B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 2002 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Apr 16, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L1/3442
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of actuating a device for varying the valve timing of an internal combustion engine without jamming of the locking element during starting of the internal combustion engine, the solenoid of the hydraulic valve is at first energized through a number of high frequency cycles of high and low energization that are broken off after a defined period of time or after a defined number of cycles, followed by a renewed energization of the solenoid with a high energization with a simultaneous check by the microprocessor to determine whether the element fixed to the camshaft has been angularly displaced relative to the element fixed to the crankshaft out of its basic position whereby if the microprocessor determines that the element fixed to the crankshaft is still in the basic position, the first two phases of energization are repeated and the microprocessor has determined an angular displacement of the element fixed to the camshaft, the solenoid is energized with a current defined by the microprocessor which is of a higher intensity than that required for the central position of the valve piston of the hydraulic valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.