Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1977-07-11
1979-01-02
Myhre, Charles J.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
123 32EE, 123119D, 123 32EA, 60276, 60285, 261 67, F02B 3300
Patent
active
041321995
ABSTRACT:
An air-fuel ratio control apparatus for use in a motor vehicle having an internal combustion engine provided with a carburetor including a main fuel supply system and a low speed fuel supply system for supplying fuel to the engine. The apparatus includes an electromagnetic valve for controlling the volume of air flowing through the air bleed of the main fuel supply system, an electromagnetic valve for controlling the volume of air flowing through the air bleed of the low speed fuel supply system, an O.sub.2 sensor for detecting the concentration of O.sub.2 in exhaust emissions, and a control circuit for producing as an output a control signal in accordance with a signal from the O.sub.2 sensor. The two electromagnetic valves are controlled by the same signal from the control circuit. A plurality of microswitches for detecting the starting of the engine, high speed operation of the engine and power operation of the engine respectively are provides so as to disconnect the control circuit from the electromagnetic valves.
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Kuroiwa Hiroshi
Nishimiya Torazo
Nishimura Yutaka
Ohyama Yoshishige
Hitachi , Ltd.
Myhre Charles J.
Nelli R. A.
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