| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent misjudgment of deterioration of a combustion condition detection by including the time of after-burning not contributing to torque, in a method for judging the combustion condition in an internal combustion engine detecting ion current generated at each ignition in a combustion chamber of the internal combustion engine and judging the combustion condition based on a period during which detected ion current is not less than a threshold. Ž<P>SOLUTION: In this method for judging the combustion condition, main combustion time from prescribed measurement start point of time until a point of time at which ion current based on main combustion generated at first after ignition gets below threshold including top dead center after ignition, whole elapsed time from the prescribed measurement start point of time until a point of time at which ion current based on the last one of after-burning generated after main combustion gets below the threshold, and combustion retention time adding the main combustion time and time integrating a period during which ion current based on whole after-burning generated after main combustion from measurement start point of time are measured respectively. One of the whole elapsed time and the main combustion time is selected as a criterion for judging the combustion condition based on the combustion retention time and at least one of the main combustion time and the whole elapsed time. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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