Optical engine knock sensing system

Details Optical engine knock sensing system Optical engine knock sensing system

1981-06-01

1983-01-25

Nelli, Raymond A.

Internal-combustion engines

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

123478, 123494, 73 35, 350 961, F02P 504, F02B 300, G01K 2126

Patent

active

043697488

ABSTRACT:
A sensor (10) optically coupled to the combustion chamber (10') of an internal combustion (IC) engine is kept free from contaminating or dirt deposits, or the like, by subjecting the sensor to mechanical shocks or vibration. The mechanical shocks or vibration are obtained by the engine itself by controlling the engine to operate for a predetermined time period as set by a monostable flip-flop (FF) (18) under controlled knocking conditions, the shock waves within the combustion chamber causing flaking off or dropping off of contaminating deposits. Controlled knocking can be obtained by advancing ignition timing by additional control of an ignition system (19) in a direction of excessive spark advance, or overriding a knocking inhibiting system already present on the engine. The degree of contamination of the sensor can be determined, for example, by integrating the light received over a predetermined angle of rotation of the engine crankshaft and comparing this rotation with the amount of fuel supplied to the engine for combustion, for example by comparison with timing of a fuel injection pulse, or the like.

REFERENCES:
patent: 2841979 (1958-07-01), Harbert
patent: 3720192 (1973-03-01), Aeno
patent: 4039845 (1977-07-01), Oberhanshi et al.
patent: 4109616 (1978-08-01), Zechnall et al.
patent: 4185274 (1980-01-01), Giallorenzi
patent: 4290398 (1981-09-01), Hallori et al.

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