Importance

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Abstract

A cylinder identified apparatus for a multi-cylinder internal combustion engine can prevent abnormal or erroneous engine control based on misidentification of cylinders due misfiring, thus avoiding possible damage to the engine. A signal generator 108 generates a reference position signal L in synchronization with the rotation of the engine, the reference position signal L comprising a series of a specific pulse corresponding to a specific cylinder and remaining pulses corresponding to the remaining cylinders. Each pulse of the reference pulse signal L has a rising edge and a falling edge respectively corresponding to a first reference position and a second reference position of a piston in a corresponding cylinder. The rising edge of each specific pulse is angularly coincident with that of each remaining pulse, whereas the falling edge of each specific pulse is angularly offset from that of each remaining pulse. A cylinder identifying element 111 identifies the cylinders based on the reference position signal L and generates a cylinder identification signal. A misfire sensing element (116, 118) senses misfiring in the engine for each engine cycle and generates a misfire determination signal. A cylinder identification evaluating element (112-115, 119) is responsive to the cylinder identification signal and the misfire determination signal for preventing the result of a cylinder identification, which has been performed by the cylinder identifying element during an engine cycle in which misfiring has been sensed by the misfiring sensing element, from being reflected on engine control.

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First Claim