Air-fuel ratio control method for internal combustion engines

Details Air-fuel ratio control method for internal combustion engines Air-fuel ratio control method for internal combustion engines

1990-04-27

1991-05-21

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

F02D 4114

Patent

active

050165968

ABSTRACT:
A method of controlling the air-fuel ratio of an air-fuel mixture supplied to an internal combustion engine including the step of interrupting the feedback control of the air-fuel ratio responsive to a detected value of the concentration of an exhaust gas ingredient after a high load operating condition of the engine in which a detected load on the engine is above a predetermined reference value has continued over a predetermined time period. Calculation is made of a value of a parameter dependent on a ratio of a time period over which the detected load on the engine continued to be above a predetermined value to a time period over which the detected load on the engine continued to be below the predetermined value. The predetermined time is set based on the calculated value of the parameter dependent on the ratio. The predetermined value may be equal to the predetermined reference value, or alternatively may be smaller than the predetermined reference value. Alternatively, the rotational speed of the engine may be detected and counting of the predetermined time period is started when the detected rotational speed of the engine exceeds a predetermined value during the feedback control of the air-fuel ratio.

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