| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device for vehicular electric equipment to count the pulse number with high accuracy. SOLUTION: The motor current is fluctuated at a substantially constant period by the rotation of a motor. The waveform of the motor current is passed through an amplification circuit and only the components of the required frequency are extracted and amplified. The amplification signal is input in a CPU, and unnecessary components are removed from the amplification signal at the filter time determined according to the battery voltage by the CPU. The pulse number of the pulse signal with the unnecessary components removed therefrom is counted by a counter of the CPU, and the number of rotation of the motor is detected based on the pulse number. COPYRIGHT: (C)2005,JPO&NCIPI
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