Patent ID: 6684687
Filing Date: 2004-02-03
Classification: F02D,G01D

Abstract:
An arrangement for a control system for a combustion engine for determining a position and rotation direction of an engine crankshaft, the arrangement comprising:an engine crankshaft which is rotatable; a group of rotational position markings arrayed around the crankshaft; first and second independent crankshaft sensors for sensing the rotation of the rotational position markings past each of the sensors, the sensors being located substantially opposite each other around the crankshaft but displaced such that when the first sensor is directly opposite a midpoint or a first rotational position marking, the second sensor is located a predetermined distance from a midpoint of a second rotational position marking that is 180 degrees from the first rotational position marking, the direction of rotation of the crankshaft being determined by comparing respective sensor signals from the first and second sensors; and a gap in the rotational position markings around the crankshaft, so that the gap is sensed by the first or the second sensor and enables a detection of the rotational position of the crankshaft.