Internal-combustion engines – Combustion chamber means combined with air-fuel mixture...
Patent
1992-09-01
1993-06-01
Wolfe, Willis R.
Internal-combustion engines
Combustion chamber means combined with air-fuel mixture...
F01P 514
Patent
active
052150585
ABSTRACT:
The knock control apparatus for an internal combustion engine comprises a knock detecting unit, a knock intensity value detecting unit for detecting a knock intensity value from a knock detecting output signal of the knock detecting unit within a predetermined crank angle range, a unit for calculating a mean value of the knock intensity value, a unit for calculating a mean deviation between the knock intensity value and the mean value, a cumulative percentage point updating unit for updating a cumulative percentage point of the distribution of the knock intensity value, a first updated quantity calculating unit for calculating a first updated quantity based on the knock intensity value and the cumulative percentage point, a second updated quantity setting unit for setting a second updated quantity for updating the cumulative percentage point updating unit based on the magnitude relationship between the first updated quantity and the mean deviation, a knock decision level calculating unit for calculating a knock decision level based on an updation result of the cumulative percentage point updating unit, and a knock decision and control unit for deciding presence or absence of knocking based on a comparison between the knock intensity value and the knock decision level and controlling knock control factors based on a result of the decision, whereby both conditions of the response at the time of a transient operation and the stability during a normal operation, respectively, of the engine are satisfied so that an optimum knock decision level may always be obtained.
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patent: 5134980 (1982-08-01), Sakakibara et al.
Sakakibara Koji
Yamada Hirohiko
Nippondenso Co. Ltd.
Wolfe Willis R.
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