| 摘要 |
PURPOSE:To improve reliability by exercising control so that while a reference signal is set to a specific value, a sensor output varying with the engine operation condition will be held at a nearly constant level by a control circuit. CONSTITUTION:Knocking discriminating unit 10, equipped with high-pass filter 22 allowing the high-frequency component of the output of Hall element 14 to pass through and reference signal generator 23 set previously to a fixed value, make comparator 24 compare both the signals to each other. On the basis of an ignition point signal sent from distribution 40, counter 25 counts the output of comparator 24 and when a fixed number of outputs are counted, a decision on knocking is made, thereby sensing a discriminating output signal out. |
