| 摘要 |
PROBLEM TO BE SOLVED: To surely determine pre-ignition even in a knock determining section, by reducing a processing load.SOLUTION: A microcomputer 4 is constituted of a CPU 5 and a detecting circuit 6, and inputs sensor signals of a vibration sensor 2 and an NE sensor 3. The detecting circuit 6 has an ADC 6a for AD-converting the sensor signal of the vibration sensor 2 in a predetermined sampling period, a peak hold circuit 6e for detecting a peak value of the sensor signal, a RAM 6f for storing the peak value, a counter 6g for detecting a crank angle when detecting the peak value, and an angle calculating part 6h. The microcomputer 4 divides a pre-ignition determining period in which a crank angle is BTDC 20-ATDC 20 into angle sections of 10° CA, and determines the pre-ignition from the peak values detected in the respective sections. The pre-ignition and a knock are determined by different determining values in a period of overlapping with the knock determining section. |
