KNOCK CONTROL SYSTEM OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To improve the knock determination accuracy by determining the generation of knock on the basis of the maximum value (MAX) of the number of knock pulse (npn). SOLUTION: This knock control system is provided with a knocking detecting means for extracting a vibration component of the knock generated in an internal combustion engine and overlapped with the ion current and for shaping the waveform thereof with the predetermined threshold value and for generating the knock pulse train Kp showing the knock strength with the number of pulse, and an engine control unit for counting the number of pulse N of the knock pulse train Kp output from the knock detecting means and for determining the existence of the knock on the basis of the number of pulse N. The engine control unit computes the knock determining threshold value (BGL) by holding the peak at a value asαtimes as large as the number of pulse.