Internal-combustion engines – Combustion chamber means combined with air-fuel mixture...
Patent
1993-03-11
1994-10-18
Nelli, Raymond A.
Internal-combustion engines
Combustion chamber means combined with air-fuel mixture...
123422, F02P 514
Patent
active
053558537
ABSTRACT:
A knock control system for an internal combustion engine derives a knock intensity indicative value Vpi from an output of a knock sensor and decides presence or absence of an engine knock by comparing the knock intensity indicative value Vpi and a knock decision level V.sub.KDi for controlling a knock control factor such as an ignition timing based on the decision. The system derives a value Si corresponding to a standard deviation of a distribution of a substantially logarithmic conversion value of the knock intensity indicative value Vpi, and a value V.sub.Mi corresponding to a median value of the above-noted distribution. The system derives the knock decision level V.sub.KDi based on the value Si and the value V.sub.Mi when the value Si is within a predetermined range. On the other hand, when the value Si deviates from the predetermined range, the system derives the knock decision level V.sub.KDi based on the value V.sub.Mi and a corrected value which is set smaller or larger than the value Si so as to prevent divergence of the knock decision level V.sub.KDi.
REFERENCES:
patent: 4617895 (1986-10-01), Sakakibara et al.
patent: 4993387 (1991-02-01), Sakakibara et al.
patent: 5245969 (1993-09-01), Nishiyama et al.
patent: 5263451 (1993-11-01), Andreasson
patent: 5263452 (1993-11-01), Oshawa et al.
patent: 5265574 (1993-11-01), Phillipp et al.
Sakakibara Koji
Yamada Hirohiko
Nelli Raymond A.
Nippondenso Co. Ltd.
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