System for detecting combustion state in internal combustion engine

U.S. Patent Number: 5339245

Abstract: A combustion state detecting system for an internal combustion engine which is equipped with a combustion state detector for detecting a combustion state of said engine. The system also includes an amplifier having a plurality of amplification factors to amplify or attenuate a combustion signal obtained by the combustion state detector, the amplification factor of the amplifier being arranged to be switchable plural times on the basis of a detection result of the combustion state detector within a predetermined time period of a combustion cycle of the engine. The decision of the combustion state of the engine is made on the basis of an output of the amplifier generated within the predetermined time period. This arrangement allows an A/D converter to input a signal having as great as possible without overflow to improve the detection accuracy of the combustion state of the engine.

Inventors: Hirata; Yoshihiko (Oobu, JP), Sakakibara; Koji (Hekinan, JP)

Assignee: Nippondenso Co., Ltd. (Kariya, JP)

Application Number: 07/812,109

Issued: 1994-08-16

Expired: 2006-08-16

Classes: 701/111 ; 123/406.42; 123/435; 701/101; 701/110; 73/115; 73/116

Field of search: 364/431.08,431.07 123/425,117,115,419,435,422,480 73/115,116,117,35

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