Method and system for reducing engine knock in an internal combu

Details Method and system for reducing engine knock in an internal combu Method and system for reducing engine knock in an internal combu

1992-04-03

1993-06-01

Nelli, Raymond A.

Internal-combustion engines

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

F02P 514

Patent

active

052150593

ABSTRACT:
A system for reducing knock in an internal combustion engine is disclosed and includes a vibration detector which detects engine vibration and generates an output signal representative of the magnitude of the engine vibration over a predetermined frequency spectrum. The vibration output signal multiplied by a first weight factor is integrated over a lower portion of the frequency spectrum to obtain a first value while the vibration signal multiplied by a second weight factor is integrated over a higher portion of the frequency spectrum to obtain a second value. The first value is compared with a first threshold value and, when the first value exceeds the first threshold, the system generates a fuel control output signal to increase the fuel supplied to the engine to reduce engine knock. Similarly, the second value is compared to a second threshold value and when the second value exceeds the second threshold value, the system generates a spark ignition control output signal to retard the engine spark ignition thereby reducing engine knock.

REFERENCES:
patent: 4116173 (1978-09-01), McDougal et al.
patent: 4991553 (1991-02-01), Kurihara et al.
patent: 5088044 (1992-02-01), Matsuura
patent: 5090382 (1992-02-01), Bolander et al.
patent: 5131369 (1992-07-01), Kanahiro et al.
patent: 5131370 (1992-07-01), Chikamatsu et al.
patent: 5133322 (1992-07-01), McDougal et al.
patent: 5134980 (1992-08-01), Sakakibara et al.
SAE Document No. 890156.
SAE Document No. 891964.

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