| 摘要 |
PURPOSE: To correctly identify a specified cylinder of an internal combustion engine according to a single circuit signal by operating the time ratio of reference position, and monitoring the change of the continuous two sections to conduct the normalizing processing according to the time ratio of a designated section. CONSTITUTION: A micro-computer 10 measures the time T during the rise of a signal of a first reference position and the time (t) during the fall of a signal from signals input through an interface circuit 9 from a rotation signal generator 8. Concerning the respective sections, the ratio t/T of the time T to the time (t) is computed. A difference between this time value of the ratio and the preceding value is divided by the preceding value to obtain an operation valueα. This operation valueαis compared with a designated valueβ, and ifα>=β, the next positional signal is determined to be a second positional signal corresponding to a specified cylinder, and it proceeds to the next step. Ifα<β, the next positional signal is determined to be a first positional signal corresponding to each cylinder.
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