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    • 60. 发明授权
    • Air-fuel ratio control system
    • 空燃比控制系统
    • US4489693A
    • 1984-12-25
    • US550078
    • 1983-11-09
    • Takeshi Matsuzaki
    • Takeshi Matsuzaki
    • C12P19/48F02D41/14F02M3/09F02M7/24F02M11/02F02M7/00
    • F02M3/09C12P19/48F02D41/1489F02M11/02F02M7/24F02D41/1456
    • A system for controlling the air-fuel ratio of an air-fuel mixture for an internal combustion engine having a two-barrel carburetor. The system is provided with an O.sub.2 sensor for detecting the concentration of oxygen in the exhaust gases, an on-off electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by the carburetor and an electronic control circuit. The electronic control circuit operates to compare output signals of the detector with a stoichiometric value, and to produce driving pulses for driving the on-off electromagnetic valve and for controlling the air-fuel ratio to a value approximately equal to the stoichiometric air-fuel ratio. A fixed signal generating circuit is selectively connected to the electronic control circuit. The two-barrel carburetor has an actuator actuated by the vacuum at the venturi of the carburetor for opening a throttle valve of the secondary side of the carburetor. A first vacuum switch is provided to be operated in response to the vacuum in the intake passage and a second vacuum switch is provided to be operated by the vacuum in the secondary side of the carburetor. When one of vacuum switches is operated, the fixed signal generating circuit is connected to the electronic control circuit for providing a fixed duty ratio for the valve and renders the electronic control circuit non-responsive to the output of the O.sub.2 sensor.
    • 一种用于控制具有双桶化油器的内燃机的空气燃料混合物的空燃比的系统。 该系统设置有用于检测排气中的氧浓度的O2传感器,用于校正由化油器供应的空气燃料混合物的空燃比的开关电磁阀和电子控制电路。 电子控制电路用于将检测器的输出信号与化学计量值进行比较,并产生用于驱动开关电磁阀的驱动脉冲,并将空燃比控制为大致等于理论空燃比 。 固定信号发生电路选择性地连接到电子控制电路。 双桶化油器具有由化油器的文丘里管处的真空致动的致动器,用于打开化油器次级侧的节流阀。 提供第一真空开关以响应于进气通道中的真空而操作,并且第二真空开关设置成由化油器二次侧的真空操作。 当操作真空开关之一时,固定信号发生电路连接到电子控制电路,为阀提供固定占空比,并使电子控制电路对O2传感器的输出无响应。