Method of and apparatus for controlling an air ratio of the air-

Details Method of and apparatus for controlling an air ratio of the air- Method of and apparatus for controlling an air ratio of the air-

1981-04-29

1983-08-30

Myhre, Charles J.

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02D 500

Patent

active

044010869

ABSTRACT:
An air-fuel ratio control device includes an oxygen concentration detector which issues a signal indicating a lean mixture, hereinafter known as a lean signal, and a signal indicating a rich mixture, hereinafter known as a rich signal. An electronic control unit is provided for converting the lean and rich signals to a signal indicating injection control, hereinafter known as an injection control signal. The level of the injection control signal is incrementally changed by a first value when the output signal of the oxygen concentration detector is changed from the rich signal to the lean signal. The level of the drive control signal is incrementally changed by a second value, which is larger than the first value, when the output signal of the oxygen concentration detector is changed from the lean signal to the rich signal. When the output signal of the oxygen concentration detector is changed from the lean signal to the rich signal, immediately after it is changed from the rich signal to the lean signal, the level of the drive control signal is changed by the first value.

REFERENCES:
patent: 4120270 (1978-10-01), Asano et al.
patent: 4163433 (1979-08-01), Fujishiro
patent: 4224910 (1980-09-01), O'Brien
patent: 4228775 (1980-10-01), Schweikert
patent: 4244340 (1981-01-01), Herth et al.
patent: 4300505 (1981-11-01), Takada et al.

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