Anti-knocking in internal combustion engine

Details Anti-knocking in internal combustion engine Anti-knocking in internal combustion engine

1986-11-21

1987-12-08

Wolfe, Jr., Willis R.

Internal-combustion engines

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

123435, F02P 5145

Patent

active

047112123

ABSTRACT:
Disclosed is an anti-knocking control system for controlling an internal combustion engine to prevent knocking in accordance with a knocking condition detected by a knock detecting apparatus on the basis of a distribution pattern of knock magnitude values derived from the output signal of a knock sensor. The knock detection apparatus is arranged to derive a knock magnitude value from the output signal of the knock sensor generated within a predetermined engine rotational angle at an interval thereby obtaining a plurality of knock magnitude values, determine a pattern of distribution of the plurality of the knock magnitude values on the basis of the results of comparison between the frequency that the knock magnitude value exceeds an upper threshold value and the frequency that the knock magnitude value goes below a lower threshold value, and detect a knocking condition of the engine in accordance with the determined distribution pattern. The lower threshold value is a value corresponding to a cumulative point lower than the cumulative 50% point of a cumulative distribution and the upper threshold value is a value corresponding to a cumulative point higher than the cumulative 50% point of the cumulative distribution.

REFERENCES:
patent: 4442814 (1984-04-01), Kubozuka
patent: 4549513 (1985-10-01), Dovaud et al.
patent: 4557236 (1985-12-01), Showalter
patent: 4617895 (1986-10-01), Sakakibara et al.
patent: 4667637 (1987-05-01), Staerzl

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