Air-fuel mixture ratio control device

Details Air-fuel mixture ratio control device Air-fuel mixture ratio control device

1981-07-10

1983-03-15

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123440, 123361, F02B 3300

Patent

active

043764304

ABSTRACT:
An air-fuel ratio control device for controlling the air-fuel ratio of a mixture to be supplied into an internal combustion engine. The device has a control circuit adapted to produce, in accordance with the offset of the output of an oxygen sensor in the exhaust system of the engine from a reference value corresponding to the desired air-fuel ratio, a control signal for making the air-fuel ratio coincide with the command air-fuel ratio. The device further has a mixture supplying means including means for adjusting the air-fuel ratio in accordance with the control signal. The air-fuel ratio adjusting means includes an actuator incorporating a step motor adapted to change the opening area of fuel passage or air bleed passage of a carburetor. The control circuit has means for temporarily stopping the step motor for a predetermined time length before the stepping speed or the stepping direction of the motor is changed, to assure the correct operation of the step motor and, hence, a precise control of the air-fuel ratio.

REFERENCES:
patent: 2389797 (1945-11-01), McNeil et al.
patent: 3875907 (1975-04-01), Wessel

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