Knock deriving apparatus for internal combustion engines

Details Knock deriving apparatus for internal combustion engines Knock deriving apparatus for internal combustion engines

1985-06-27

1987-01-20

Levy, Stewart J.

Measuring and testing

Engine detonation

Combustion signal compared to reference signal varied by a...

G01L 2322

Patent

active

046372458

ABSTRACT:
A knock deriving apparatus for an internal combustion engine wherein only a knock signal is precisely derived from the output signal of a knock sensor including a noise signal component by the provision of first and second frequency filters serially connected to the knock sensor. The first frequency filter has a band width wider than that of the second frequency filter to cover a resonant noise. The resultant band width by the series combination of both filters is set to just cover a frequency band where knocks occur. The output of the first frequency filter is converted to a comparative reference signal which is compared in a comparator with the output of the second filter, thereby deriving a stable knock signal.

REFERENCES:
patent: 3822583 (1974-07-01), Keller et al.
patent: 4111035 (1978-09-01), West et al.
patent: 4346586 (1982-08-01), Furrey

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