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    • 10. 发明申请
    • AIR-FUEL RATIO CONTROL APPARATUS FOR AN INTERNAL COMBUSTION ENGINE
    • 用于内燃机的空燃比比控制装置
    • US20130110380A1
    • 2013-05-02
    • US13700248
    • 2010-05-28
    • Makoto TomimatsuRyota OnoeTakahiko Fujiwara
    • Makoto TomimatsuRyota OnoeTakahiko Fujiwara
    • F02D41/00F02D41/30
    • F02D41/00F02D41/1441F02D41/1456F02D41/1479F02D41/1482F02D41/1483F02D41/2454F02D41/30
    • An air-fuel ratio control apparatus according to an embodiment of the present invention, controls an air-fuel ratio (air-fuel ratio of an engine) of a mixture supplied to the engine, based on an output value of the downstream-side air-fuel ratio sensor disposed downstream of a catalyst. That is, the air-fuel ratio control apparatus sets the air-fuel ratio of the engine at a rich air-fuel ratio when the output Voxs is smaller than a reference value VREF (when a rich request is occurring). The air-fuel ratio control apparatus sets the air-fuel ratio of the engine at a lean air-fuel ratio when the output Voxs is larger than a reference value VREF (when a lean request is occurring). The air-fuel ratio control apparatus makes the target value VREF gradually come closer to a reference value VF (stoichiometric air-fuel ratio corresponding value) from a certain value, when the output value Voxs deviates greatly from the reference value Vf (points P1-P3).
    • 根据本发明的实施方式的空燃比控制装置,基于下游侧空气的输出值来控制供给到发动机的混合气体的空燃比(发动机的空燃比) - 燃料比传感器设置在催化剂的下游。 也就是说,当输出Voxs小于参考值VREF(当发生丰富请求时)时,空燃比控制装置将发动机的空燃比设定为浓空燃比。 当输出Voxs大于参考值VREF(当发生精益请求时)时,空燃比控制装置将发动机的空燃比设定为稀空燃比。 当输出值Vox从参考值Vf大大偏离时,空燃比控制装置使目标值VREF从特定值逐渐变得更接近基准值VF(理论空燃比对应值)(点P1- P3)。