Patent ID: 9702786
Date: 2017-07-11
CPC Classifications: F02D,F02P,G01M

Claim:
1. A process for identifying edges on a camshaft target of an internal combustion engine rotating in a normal direction of rotation and controlled by a control unit, said camshaft target having a plurality of teeth on the periphery thereof, the plurality of teeth forming, for a position sensor facing said teeth, a series of significant edges when the camshaft rotates through one revolution, the significant edges being edges that are processed by identification logic, the process comprising the following steps: a) calculating, for each of the significant edges, a characteristic relating to a position of the significant edges preceding said significant edge in accordance with the normal direction of rotation, said characteristic being defined by formula b) defining a sub-list of significant edges and initializing the sub-list with all significant edges, c) during the movement of the camshaft target, calculating, during a significant edge detection, an index relating to time intervals elapsed since the preceding significant edges, by the formula: d) comparing the index CT(k) with each of intervals INT(j) defined by e) awaiting an appearance of a new significant edge, replacing each edge j in the sub-list by its immediate successor j+1 modulo, then repeating steps c) to d) until at most one significant edge is obtained in the sub-list in step d), f) identifying the position of the camshaft once a single significant edge has been obtained in the sub-list.