Internal-combustion engines – Combustion chamber means combined with air-fuel mixture...
Patent
1990-10-26
1992-08-25
Nelli, Raymond A.
Internal-combustion engines
Combustion chamber means combined with air-fuel mixture...
F02P 514
Patent
active
051409623
ABSTRACT:
A knock sensing apparatus for a multi-cyclinder internal combustion engine has a knock sensor that generates an electrical output signal corresponding to vibrations of the engine. A peak hold circuit generates a level signal indicating the level of the output signal of the knock sensor during a prescribed period. The level signal is compared with a threshold determined by the operating region of the engine. When the level signal exceeds the threshold level, it is determined that the engine is knocking. According to one form of the present invention, the threshold is determined on the basis of the output signals from a plurality of sensors for sensing different operating conditions of the engine. In a preferred embodiment, the sensors include a sensor for sensing an indication of the engine rotational speed and an engine load sensor. According to another form of the present invention, the threshold is then corrected in accordance with the difference between the actual noise level of the engine as indicated by an average of the level signal and an expected noise level determined by the operating condition detected by the sensor. The corrected threshold is then compared with the level signal to determine if knocking is taking place.
REFERENCES:
patent: 4711213 (1987-12-01), Sakakibara et al.
patent: 4729358 (1988-03-01), Morita et al.
patent: 4736723 (1988-04-01), Nagar
patent: 4760828 (1988-08-01), Shimada et al.
patent: 4766545 (1988-08-01), Nagar
patent: 4770144 (1988-09-01), Sakakibara et al.
patent: 4774922 (1988-10-01), Morita
patent: 4790281 (1988-12-01), Micro et al.
patent: 4951630 (1990-08-01), Iwata
patent: 4971007 (1990-11-01), Gopp et al.
Mitsubishi Denki K.K.
Nelli Raymond A.
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