Cam shaft`s angular offset system controlling method for motor vehicle, involves modifying or storing minimum engine speed for real value to keep offset quality criterion on real angular offset

摘要

The method involves recommending a minimum engine speed based on a stored offset control authorization characteristic (CAR) e.g. mathematical function. A real angular offset is measured from measurement information (ANG1, ANG2) provided by angular position sensors (6, 7) on a cam shaft (2) and a crankshaft (4). A real value of an engine oil variable (VAR) e.g. engine oil temperature, is determined by a real value determining unit (11). The minimum engine speed is modified/stored for the real value to keep an offset quality criterion such as recommended minimum speed, on a real angular offset. An independent claim is also included for a device for controlling an angular offset system of a cam shaft that activates valves of an internal combustion engine with respect to a crankshaft.