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    • 81. 发明授权
    • Double air-fuel ratio sensor system having improved exhaust emission
characteristics
    • 具有改善的废气排放特性的双重空燃比传感器系统
    • US4750328A
    • 1988-06-14
    • US105588
    • 1987-10-08
    • Hiroshi Sawada
    • Hiroshi Sawada
    • F02D41/00F02D41/14
    • F02D41/1441F02D41/1483
    • In a double air-fuel sensor system including two air-fuel ratio sensors upstream and downstream of a catalyst converter provided in an exhaust gas passage, an air-fuel ratio feedback control parameter is calculated in accordance with the output of the downstream-side air-fuel ratio sensor in an air-fuel ratio feedback control mode therefor, and an actual air-fuel ratio is adjusted in accordance with the output of the upstream-side air-fuel ratio sensor and the air-fuel ratio feedback control parameter. In this air-fuel ratio feedback control mode, a large allowable range is imposed on the air-fuel ratio feedback control parameter. In a non air-fuel ratio feed control mode for the downstream-side air-fuel ratio sensor, a small allowable range is imposed on the air-fuel ratio feedback control parameter which, in this case, is unchangeable.
    • 在设置在废气通道中的催化剂转化器的上游和下游的两个空燃比传感器系统中,根据下游侧空气的输出来计算空燃比反馈控制参数 - 燃料比反馈控制模式的空燃比传感器,并且根据上游侧空燃比传感器的输出和空燃比反馈控制参数来调整实际空燃比。 在该空燃比反馈控制模式中,对空燃比反馈控制参数施加大的容许范围。 在下游侧空燃比传感器的非空燃比进给控制模式中,对空燃比反馈控制参数施加小的允许范围,在这种情况下,这是不可改变的。