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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsYukio Miyashita, Hiroshi Mifune, Kunio Noguchi, Hironao Fukuchi
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An air-fuel ratio control method for an internal combustion engine. The air-fuel ratio of an air-fuel mixture supplied to the engine is feedback-controlled to a desired air-fuel ratio dependent on operating conditions of the engine. When a transmission is being shifted or before a predetermined time period elapses after the shifting, the desired air-fuel ratio is held at a value assumed immediately before the shifting of the transmission. In another form of the invention, when the transmission is being shifted, or when the operating characteristics of at least one set of a set of intake valves and a set of exhaust valves have been not changed before the predetermined time period elapses after the shifting of the transmission, the desired air-fuel ratio is held at a value assumed before the shifting of the transmission.
An air-fuel ratio control method for an internal combustion engine having an exhaust passage, an exhaust gas ingredient concentration sensor arranged in said exhaust passage for sensing the concentration of an ingredient in exhaust gases from said engine, and a transmission, wherein the air-fuel ratio of an air-fuel mixture supplied to said engine is feedback-controlled in response to output from said exhaust gas ingredient concentration sensor to a desired air-fuel ratio dependent on operating conditions of said engine, the method comprising the steps of:
An air-fuel ratio control method for an internal combustion engine having a set of intake valves and a set of exhaust valves, at least one set of said set of intake valves and said set of exhaust valves having operating characteristics thereof changeable between ones suitable for a low engine rotational speed region and ones suitable for a high engine rotational speed region, an exhaust passage, an exhaust gas ingredient concentration sensor arranged in said exhaust passage for sensing the concentration of an ingredient in exhaust gases from said engine, and a transmission, wherein the air-fuel ratio of an air-fuel mixture supplied to said engine is feedbackcontrolled in response to output from said exhaust gas ingredient concentration sensor to a desired air-fuel ratio dependent on operating conditions of said engine, the method comprising the steps of:
An air-fuel ratio control method as claimed in claim I, wherein said engine is installed on an automotive vehicle having a clutch, and said determination as to whether or not said transmission is being shifted in said step (1) is effected by determining whether said clutch is disengaged or engaged.
Dependencies are inferred from the claim text.