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:
Aug. 17, 2004
Filed:
Dec. 06, 2001
Jürgen Weimer, Euerbach, DE;
Markus Kramer, Stadelschwarzach, DE;
Mannesmann Sachs AG, Schweinfurt, DE;
Abstract
In an engine having a crankshaft and a camshaft, the current angular position of a rotor fixed to the crankshaft is detected, and a top dead center (TDC) position of the crankshaft is determined based on the current angular position of the rotor, wherein the TDC position is one of an ignition top dead center (ITDC) and a gas transfer top dead center (GTDC). This determination may be made using a learning routine the first time the engine is started. The camshaft angle is then determined based on the TDC value and the current rotor position, and transmitted to a control unit for the engine. The current angular position of the rotor and the camshaft angle are stored in a memory unit when the engine stops, for use the next time the engine is started.