Engine control system with cam sensor

An engine control system for a multi-cylinder engine having a first camshaft and a second camshaft, the engine control system comprising:

• a first cam sensor provided on the first camshaft and used for generating a signal changing a number of times, which is equal to at least half the number of cylinders employed in the multi-cylinder engine, during 1 rotation of the first camshaft;
• a second cam sensor provided on the second camshaft and used for generating a signal changing a number of times, which is equal to at least half the number of cylinders employed in the multi-cylinder engine, during 1 rotation of the second camshaft;
• and
• a cylinder-identifying means for identifying a rotational position of the multi-cylinder engine on the basis of the signal generated the first cam sensor and the signal generated the second cam sensor.

An engine control system for a multi-cylinder engine, the engine control system comprising:

• a crank sensor provided on a crankshaft of the multi-cylinder engine and used for outputting a signal indicating a first reference position;
• a cam sensor provided on a camshaft of the multi-cylinder engine and used for outputting a signal indicating a second reference position different from the first reference position;
• a variable valve timing unit for changing the camshaft's rotational phase relative to the crankshaft;
• a valve timing control means for controlling the variable valve timing unit on the basis of a signal generated by the crank sensor and a signal generated by the cam sensor;
• a first engine control means for detecting the first reference position and controlling the multi-cylinder engine on the basis of the first reference position;
• and
• a second engine control means for detecting the second reference position and controlling the multi-cylinder engine on the basis of the second reference position at least during a period ending with first detection of the first reference position.