| 摘要 |
PROBLEM TO BE SOLVED: To provide a knock controller for an internal combustion engine, which can switch a filter frequency to extract a knock signal from a knock sensor signal, and can switch an amplification factor of a gain adjusting circuit so that levels of the knock signals before and after switching the filter frequency are the same. SOLUTION: The knock controller for the internal combustion engine is provided with a knock sensor 2 for detecting the vibration generated in the internal combustion engine 1, an operation state detection means 18 for detecting the operation state of the internal combustion engine 1, the gain adjusting circuit 3 for adjusting the amplification factor of the knock signal Vf, a filter circuit 4 for extracting the knock signal Vf out of the knock sensor signal Vn, a gain switching means 17 for switching the amplification factor of the gain adjusting circuit 3 corresponding to the operation state of the internal combustion engine 1, and a filter frequency switching means 16 for switching the filter frequency corresponding to the operation state of the internal combustion engine 1. The difference between a background level BGL directly after switching the filter frequency and a background level BGL after stabilizing is decreased. COPYRIGHT: (C)2008,JPO&INPIT |
