Air-fuel ratio controlling system for an internal combustion eng

Details Air-fuel ratio controlling system for an internal combustion eng Air-fuel ratio controlling system for an internal combustion eng

1978-07-10

1980-02-12

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123139BG, 123119EC, 123 32EE, F02M 3900, F02B 3300

Patent

active

041878167

ABSTRACT:
An air-fuel ratio controlling system for a fuel-injection type internal combustion engine has an air valve disposed in an air intake duct upstream of a throttle valve and a fuel-metering variable orifice disposed in a fuel circuit. The air valve and the fuel-metering variable orifice are operatively associated with each other and controlled normally to maintain the air-fuel ratio at a substantially constant value. Pressurized fuel is used as a working fluid to operate the air valve. O.sub.2 sensor detects the oxygen content of exhaust gases to actuate a valve which varies the pressure of the working fluid to change the degree of opening of the air valve whereby the air-fuel ratio is adjusted in accordance with the output of the O.sub.2 sensor.

REFERENCES:
patent: 3650258 (1972-03-01), Jackson
patent: 3739762 (1973-06-01), Jackson
patent: 3796200 (1974-03-01), Knapp
patent: 4031873 (1977-06-01), Banzhaf et al.
patent: 4085723 (1978-04-01), Tanaka et al.

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