Internal combustion engine misfire diagnosis device

Abstract

Abstract PURPOSE:To improve accuracy of a misfire diagnosis by performing the misfire diagnosis while correcting a period based on its deviation when the misfire diagnosis is performed by means of the deviation obtained between mutual periods measured in the single period of a detection signal output from a crank angle detecting means and compared with each other. CONSTITUTION:A crank angle detecting means A, which outputs a detection signal per crank angle corresponding to a stroke phase difference between cylinders, is provided, and also a period measuring means B, which measures a period of outputting the detection signal from this means A, is provided. A deviation between mutual periods, measured in the single period of the detection signal output from the means A, is obtained by weight averaging by means of a period deviation setting means C, next generation of a misfire is diagnosed in a misfire diagnostic means D by comparing the mutual periods during the single period of the detection with each other while correcting the periods based on the deviation of periods obtained by the means C.

Inventors

• 👤 Shinpei Nakaniwa
• 👤 伸平 中庭

Bibliographic Details