| 摘要 |
A device in which knock information of an engine is detected by a knock sensor, knock signal components are selectively produced from the knock information through a frequency filter, a reference voltage of knock detection is made from the above output, and knocking generated in the engine is detected by comparing the reference voltage with the output of the frequency filter. A plurality of the above knock detection systems are provided, where the knock sensors, frequency filters and the circuits for producing reference voltages are designed to have characteristics that are different depending upon the individual detection systems. Therefore, optimum characteristics can be obtained in each of the knock detection systems; i.e., the knock detection systems exhibit characteristics to uniformly and reliably detect knocks of all cylinders of an engine. |
