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    • 8. 发明授权
    • Inter-cylinder air-fuel ratio imbalance determination apparatus for internal combustion engine
    • 用于内燃机的缸内空燃比不平衡确定装置
    • US08560208B2
    • 2013-10-15
    • US13505849
    • 2009-11-05
    • Hiroshi MiyamotoYasushi IwazakiHiroshi Sawada
    • Hiroshi MiyamotoYasushi IwazakiHiroshi Sawada
    • B60T7/12
    • F02D41/0085F02D41/0065F02D41/1454Y02T10/47
    • An inter-cylinder air-fuel ratio imbalance determination apparatus (determination apparatus) according to the present invention obtains, as an “EGR supplying state imbalance determination parameter”, a value corresponding to a differential value d(abyfs)dt of a detected air-fuel ratio abyfs represented by an output value of an air-fuel ratio sensor when an EGR gas is being supplied, and obtains, as an “EGR stop state imbalance determination parameter”, a value corresponding to a differential value d(abyfs)dt when an EGR gas supply is being stopped. The determination apparatus obtains an “EGR-causing imbalance determination parameter Pegr” by subtracting the EGR stop state imbalance determination parameter Poff from the EGR supplying state imbalance determination parameter Pon, and determines that an inter-cylinder air-fuel ratio imbalance state has occurred due to the supply of the EGR gas when the parameter Pegr is larger than a threshold Pegrth.
    • 根据本发明的气缸内空燃比不平衡判定装置(判定装置),作为“EGR供给状态不平衡判定参数”,获得与检测到的空气 - 燃料比不平衡判定装置的差分值d(abyfs)dt对应的值, 在EGR气体供给时由空燃比传感器的输出值表示的燃料比abyfs,作为“EGR停止状态不平衡判定参数”,获得与差分值d(abyfs)dt对应的值 正在停止EGR气体供应。 确定装置通过从EGR供应状态不平衡确定参数Pon中减去EGR停止状态不平衡确定参数Poff而获得“EGR导致不平衡确定参数Pegr”,并且确定缸间空燃比不平衡状态已经发生 当参数Pegr大于阈值Pegrth时,供应EGR气体。