A new method of diagnosing in-cylinder combustion deficiency based on fuzzy clustering theory and intra-cycle speed fluctuation

A new method of diagnosing in-cylinder combustion deficiency, utilizing intra-cycle speed fluctuation by means of fuzzy clustering theory was developed in this paper. In the study, a self-researched condition monitor was used to acquire on-line test data of intra-cycle speed fluctuation. The experiments in SY492Q-(gasoline engine) showed that fault diagnosis using fuzzy clustering theory was advantageous for considering many factors and reliable under 2000rpm.