FOUR-STROKE CYCLE INTERNAL COMBUSTION ENGINE AND METHOD OF IDENTIFYING CYLINDER OF FOUR-STROKE CYCLE INTERNAL COMBUSTION ENGINE

摘要

An internal combustion engine includes an odd number of cylinders. A crank angle sensor of 360° crank angle (CA) provides a POS signal including a pulse train that consists of pulses generated at each 10° CA. This POS signal includes a specific portion 28' generated at each 360° CA by a gap portion of the crank angle sensor. The time required for a change of 10° CA is determined for each 10° CA as a second signal, and the time is integrated for intervals A, B, and C. Since the second signal vibrates with a period according to the number of cylinders in response to changes in the stroke of each cylinder, intervals T1 and T4, for example, can be identified by comparing the integrated values. In this manner, the cylinders can be identified by only the signal of the crank angle sensor of 360° CA without depending on a cam angle sensor of 720° CA.