Patent ID: 6775611
Filing Date: 2004-08-10
Classification: F02D

Abstract:
An engine control apparatus having a crank sensor for detecting rotation of a crankshaft of a multi-cylinder four-cycle engine and a cam sensor for detecting rotation of a camshaft, the crank sensor outputting a crank signal having an angle indicating part indicating angular positions at every even crank angle interval and a reference position indicating part indicating at least one reference position, and the cam sensor outputting a cam signal having an angle indicating part indicating angular positions at every even cam angle interval and a reference position indicating part indicating at least one reference position, the engine control apparatus comprising:a first cylinder determining means for executing a cylinder determining processing using the crank signal from the crank sensor; a second cylinder determining means for executing a cylinder determining processing using the cam signal from the cam sensor; a sensor signal abnormality detecting means for detecting abnormalities of the crank signal and the cam signal respectively; and a cylinder determination controlling means for prohibiting the cylinder determining processing of the first cylinder determining means when both the crank signal and the cam signal become abnormal while operating the engine, and then for withdrawing the prohibition of the cylinder determining processing on the condition that the cam signal is recovered to normal.