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    • 3. 发明授权
    • Air-fuel ratio feedback control system including at least
downstream-side air-fuel ratio sensor
    • 至少包括下游侧空燃比传感器的空燃比反馈控制系统
    • US4964271A
    • 1990-10-23
    • US163871
    • 1988-03-03
    • Hiroshi SawadaTatehito UedaKiyoshi NakanishiTakayuki Demura
    • Hiroshi SawadaTatehito UedaKiyoshi NakanishiTakayuki Demura
    • F02D41/14
    • F02D41/1441F02D41/123F02D41/1481F02D41/1488F02D2041/1418F02D2200/021F02D41/08F02D41/1454
    • In an air-fuel ratio feedback control system including at least one air-fuel ratio sensor downstream of a catalyst converter provided in an exhaust gas passage, an actual air-fuel ratio is controlled in accordance with the output of the downstream-side air-fuel ratio sensor. When at least one of the air-fuel ratio feedback control conditions for the downstream-side air-fuel ratio sensor is not satisfied the controlled air-fuel ratio is made an air-fuel ratio by an open loop control, while all the air-fuel ratio feedback control conditions for the downstream-side air-fuel ration sensor are satisfied the controlled air-fuel ratio is made the stoichiometric ratio (.lambda.=1) in accordance with the output of the downstream-side air-fuel ratio sensor. For a period after all the air-fuel ratio feedback control conditions for the downstream-side air-fuel ratio sensor are satisfied, the control by the output of the downstream-side air-fuel ratio sensor is prohibited, but, the controlled air-fuel ratio is made the stoichiometric ratio (.lambda.=1) by an open loop control or by the output of an upstream-side air-fuel ratio sensor.
    • 在设置在废气通道中的催化剂转化器的下游的至少一个空燃比传感器的空燃比反馈控制系统中,根据下游侧空气燃料比的输出控制实际的空燃比, 燃油比传感器 当下游侧空燃比传感器的空燃比反馈控制条件中的至少一个不满足时,通过开环控制使受控空燃比成为空燃比, 满足下游侧空燃比传感器的燃料比反馈控制条件,根据下游侧空燃比传感器的输出,使受控空燃比成为化学计量比(λ= 1)。 在满足下游侧空燃比传感器的空燃比反馈控制条件的期间之后,禁止下游侧空燃比传感器的输出进行的控制, 通过开环控制或上游侧空燃比传感器的输出,使燃料比成为化学计量比(λ= 1)。
    • 7. 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。