Air-fuel ratio control system for internal combustion engine

U.S. Patent Number: 5353775

Abstract: An engine temperature is measured an opening of a door is detected so an electrical conduction is made to a heater for heating a sensor element by setting a target element temperature to a relatively high level if such engine temperature (cooling water temperature Thw) is relatively low or, on the other hand, by setting the target element temperature to a relatively low level if the cooling water temperature is relatively high. Then the element temperature is detected and the heater is turned off when the element temperature has reached the target temperature.

Inventors: Yamashita; Yukihiro (Kariya, JP), Ikuta; Kenji (Rolling Hills Estates, CA), Isomura; Shigenori (Kariya, JP)

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

Application Number: 08/009,199

Issued: 1994-10-11

Expired: 2006-10-11

Classes: 123/686 ; 123/697

Field of search: 123/685,686,697 204/406,425

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