Knock control system for an internal combustion engine

Details Knock control system for an internal combustion engine Knock control system for an internal combustion engine

1996-10-31

1997-12-09

Argenbright, Tony M.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

73 3508, F02P 515, G01L 2322

Patent

active

056949006

ABSTRACT:
A knock control system for an internal combustion engine which subjects a knock signal waveform superposed on an ionic current to pulse processing so as to improve a signal-to-noise (SN) ratio, thereby achieving higher reliability thereof without adding to cost. The knock control system for the internal combustion engine is equipped with: a device for deciding the ignition timing for each cylinder based on a crank angle signal; an ignition coil which applies high voltage to spark plugs according to the ignition timing; a device for detecting an ionic current flowing through an ignited spark plug; a device for detecting a knock from an ionic current detection signal; a device for correcting the ignition timing by delaying it when a knock has been detected; a waveform processing device for extracting a knock signal waveform from the ionic current detection signal in the form of a knock pulse string; and a counter for counting the number of pulses from the pulse edges of the knock pulse string. A knock controller decides the amount of delay based on the count value of the pulses.

REFERENCES:
patent: 4444172 (1984-04-01), Sellmaier et al.
patent: 4491110 (1985-01-01), Bone et al.
patent: 4539957 (1985-09-01), Haraguchi et al.
patent: 4601193 (1986-07-01), Blauhut et al.
patent: 5263452 (1993-11-01), Ohsawa et al.

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