The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2002
Filed:
Apr. 09, 2001
Laure Carbonne, Toulouse, FR;
Siemens VDO Automotive S.A.S., Toulouse-Cedex, FR;
Abstract
A method for controlling a valve lift device associated with an internal combustion engine includes determining, according to maps, a relative timing angle to be applied to a camshaft and crankshaft. The determined timing angle is processed with a PID-type control. Each time an engine enters a stabilized low idle speed, a reference value of the timing angle is determined when a valve lift device is inactivated. The reference value is taken into consideration when any later timing angle command is given. At least one further step is included. For example, a map of a duty cycle for an opening of a hydraulic valve controlled by the PID of the valve lift device is pre-established on a test bed as a function of an engine water temperature, and/or the timing angle to be applied as a function of the engine water temperature is adjusted by modifying the reference value.