Air-fuel ratio controlling apparatus for internal- combustion engine

Abstract

Abstract PURPOSE:To improve the drivability of an engine, by effecting optimal control on the air-fuel ratio of mixture through detection of the degree of warmed-up state of engine. CONSTITUTION:The degree of warmed-up state of an engine is detected by means of various sensors such as a sensor 8 for detecting the flow rate of intake air, sensor 9 for detecting the temperature of intake air, water-temperature sensor 10, engine-speed sensor 11 and O2-sensor 12. In the state that the engine temperature is low, the amount of fuel injected from injectors 5 is increased (mixture is rendered rich) by a control circuit 20, while in the state that the engine is half warmed up, feedback control is effected. Further, in the state that the engine is completely warmed up, control mode is switched to partial lean control. By thus executing optimal control on the air-fuel ratio, it is enabled to improve performance of the engine.

Inventors

• 👤 Takao Niwa
• 👤 丹羽　孝夫
• 👤 Takeshi Gono
• 👤 郷野　武
• 👤 Shiro Nagasawa
• 👤 長沢　四郎
• 👤 Yasuo Yamada
• 👤 山田　泰男

Bibliographic Details