Knock sensing apparatus for an internal combustion engine

Details Knock sensing apparatus for an internal combustion engine Knock sensing apparatus for an internal combustion engine

1990-10-22

1991-10-29

Argenbright, Tony M.

Internal-combustion engines

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

73 35, F02D 100

Patent

active

050606158

ABSTRACT:
A knock sensing apparatus for a multi-cylinder internal combustion engine has a knock sensor that generates an electrical output signal corresponding to vibrations of the engine. A level indicating means generates a first level signal indicating the level of the output signal of the knock sensor during a first period at least partially coinciding with the power stroke in a cylinder of the engine and a second level signal indicating the level of the output signal of the knock sensor during a second period. An averager forms an average of the second level signal over a prescribed period, and a threshold calculator calculates a threshold based on the average. A comparator compares the first level signal and the threshold and generates a signal indicating knocking when the first level signal exceeds the threshold.

REFERENCES:
patent: 4343278 (1982-08-01), Asano
patent: 4454750 (1984-06-01), Yoshida et al.
patent: 4501137 (1985-02-01), Aoki et al.
patent: 4558674 (1985-12-01), Okado et al.
patent: 4766545 (1988-08-01), Nagai

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