CYLINDER DETECTION IN A FOUR-STROKE INTERNAL COMBUSTION ENGINE

An arrangement for cylinder detection in a four-stroke internal combustion engine is disclosed. The arrangement comprises a first disc connected to a crankshaft, the first disc comprising a first mark (M-M) within each an interspace angle (α), and a second disc connected to a camshaft and comprising one second mark (M-M) per number of cylinders. The first mark (M-M) is arranged on a first disc, or the plurality of first marks (M-M) are arranged in relation to each other on the first disc, and the second marks (M-M) are arranged in relation to each other on the second disc such that for each interspace angle (α) the relevant first mark (M-M) is detectable by a first sensor and the relevant second mark (M-M) is detectable by a second sensor at different relative rotational positions between the first disc and the second disc.