Knocking control system for internal combustion engine

Details Knocking control system for internal combustion engine Knocking control system for internal combustion engine

1992-01-24

1993-02-23

Dolinar, Andrew M.

Internal-combustion engines

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

73 35, F02P 515

Patent

active

051880806

ABSTRACT:
A knocking control system for an internal combustion engine which is capable of surely detecting and reducing the knock of the engine. The knocking control system is equipped with a logarithmic conversion section for performing the logarithmic conversion of the effective knock intensity of the output signals of a knock sensor and a central value detecting section for detecting a central value in the logarithmic conversion value distribution. The deviation between the central value and the logarithmic conversion value is averaged to obtain an average value corresponding to the standard deviation of the logarithmic conversion value, thereby producing a knock decision level on the basis of the average value. The knock decision level is compared with the logarithmic conversion value so that the occurence of the knock is determined in accordance with the comparison result and the ignition timing of the engine is controlled in accordance with the determination result so as to reduce the knocking state.

REFERENCES:
patent: 4061116 (1977-12-01), Saida et al.
patent: 4617895 (1986-10-01), Sakakibara et al.
patent: 4711212 (1987-12-01), Haraguchi et al.
patent: 4711214 (1987-12-01), Sakakibara et al.
patent: 4993387 (1991-02-01), Sakakibara et al.

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