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    • 84. 发明授权
    • Air-fuel ratio imbalance among cylinders determining apparatus for an internal combustion engine
    • 用于内燃机的气缸确定装置之间的空燃比不平衡
    • US08452517B2
    • 2013-05-28
    • US13382079
    • 2009-07-02
    • Hiroshi SawadaFumihiko NakamuraHiroshi MiyamotoYasushi Iwazaki
    • Hiroshi SawadaFumihiko NakamuraHiroshi MiyamotoYasushi Iwazaki
    • G01M15/10F02D41/00F02D41/14
    • F02D41/0085F02D41/1454F02D2400/18
    • An air-fuel ratio imbalance among cylinders determining apparatus according to the present invention comprises an air-fuel ratio sensor having a protective cover and an air-fuel ratio detection element accommodated in the protective cover, and imbalance determining means. The imbalance determining means obtains a detected air-fuel ratio abyfs based on an output Vabyfs of the air-fuel ratio sensor every elapse of a constant sampling time ts, and obtains, as an indicating amount of air-fuel ratio change rate, a difference (detected air-fuel ratio change rate ΔAF) between a present detected air-fuel ratio abyfs which is newly detected and a previous air-fuel ratio abyfsold which was detected the sampling time ts ago, an average of the detected air-fuel ratio change rate ΔAF, and the like. The imbalance determining means determines that the air-fuel ratio imbalance among cylinders state is occurring, when a magnitude of the indicating amount of air-fuel ratio change rate is larger than an imbalance determination threshold.
    • 根据本发明的气缸确定装置之间的空燃比不平衡包括具有保护盖和容纳在保护盖中的空燃比检测元件的空燃比传感器和不平衡确定装置。 不平衡确定装置根据空燃比传感器每经过一定采样时间ts的输出Vabyfs获得检测的空燃比abyfs,并且获得作为空燃比变化率的指示量的差 在检测到的新检测到的当前检测空燃比abyfs与检测出采样时间ts前的空燃比abyfsold之间的检测空燃比变化率ΔAF(检测空燃比变化率ΔAF),检测到的空燃比变化的平均值 速率DeltaAF等。 当空燃比变化率的指示量大于不平衡判定阈值时,不平衡确定装置确定气缸状态之间的空燃比不平衡发生。
    • 87. 发明申请
    • INTER-CYLINDER AIR-FUEL RATIO IMBALANCE DETERMINATION APPARATUS FOR AN INTERNAL COMBUSTION ENGINE
    • 内燃机的气缸内空气燃料比重测定装置
    • US20120232773A1
    • 2012-09-13
    • US13509372
    • 2009-11-12
    • Yasushi IwazakiHiroshi MiyamotoHiroshi SawadaKeiichiro Aoki
    • Yasushi IwazakiHiroshi MiyamotoHiroshi SawadaKeiichiro Aoki
    • F02D41/26
    • F02D41/0085F02D41/1441F02D41/1455
    • An inter-cylinder air-fuel ratio imbalance determination apparatus (determination apparatus) according to the present invention obtains, based on the output value of the air-fuel ratio sensor 67, an air-fuel ratio fluctuation indicating amount whose absolute value becomes larger as a fluctuation of the air-fuel ratio of the exhaust gas passing through a position at which the air-fuel ratio sensor is disposed becomes larger, and further obtains an imbalance determination parameter which becomes larger as an absolute value of the air-fuel ratio fluctuation indicating amount becomes larger. In addition, the determination apparatus obtains an average value of the air-fuel ratio of the exhaust gas during a period in which the imbalance determination parameter is being obtained, and obtains an imbalance determination threshold which becomes smaller as the average value of the air-fuel ratio is closer to the stoichiometric air-fuel ratio. The determination apparatus determines that an inter-cylinder air-fuel ratio imbalance state has been occurring when the imbalance determination parameter is larger than the imbalance determination threshold.
    • 根据本发明的气缸内空燃比不平衡判定装置(判定装置),基于空燃比传感器67的输出值,求出绝对值变大的空燃比变动指示量 通过设置空燃比传感器的位置的废气的空燃比的波动变大,进而获得作为空燃比变动的绝对值变大的不平衡判定参数 指示量变大。 此外,确定装置获得在获得不平衡确定参数的时段期间的排气的空燃比的平均值,并且获得作为空气 - 燃料的平均值变小的不平衡确定阈值, 燃料比接近化学计量空燃比。 当不平衡确定参数大于不平衡确定阈值时,确定装置确定已经发生了缸间空燃比不平衡状态。