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    • 2. 发明授权
    • Apparatus for controlling engine operable on gasoline/alcohol fuel blend
    • 用于控制可在汽油/醇燃料混合物上操作的发动机的装置
    • US4967714A
    • 1990-11-06
    • US453897
    • 1989-12-20
    • Ryuzaburo Inoue
    • Ryuzaburo Inoue
    • F02D41/02F02D19/06F02D41/00F02D41/14
    • F02D41/148F02D19/084F02D19/087F02D41/0025F02D41/1441F02D2200/0611Y02T10/36
    • An apparatus for use with an internal combustion engine operable on either of gasoline fuel and gasoline/alcohol fuel blend. The apparatus comprises an alcohol concentration sensor for sensing the alcohol concentration of the fuel to be delivered to the engine, an oxygen sensor sensitive to the oxygen content of exhaust gases discharged from the engine for producing an air/fuel ratio feedback signal, and a control unit coupled to the alcohol concentration sensor and the oxygen sensor for controlling the amount of fuel metered to the engine. The control unit calculates a basic value for the amount of fuel metered to the engine based on engine operating conditions and corrects the calculated basic value for the sensed alcohol concentration. A correction factor, which is set within a control range defined by predetermined upper and lower limits, is calculated based on a deviation of the air/fuel ratio from a stoichiometric value. The calculated basic value is corrected based on the calculated correction factor to provide a closed loop air/fuel ratio control. The upper and lower limits are changed to expand the control range in the presence of an alcohol concentration signal change exceeding a predetermined degree.
    • 一种与可在汽油燃料和汽油/醇燃料混合物中的任何一种操作的内燃机一起使用的装置。 该装置包括用于感测要发送到发动机的燃料的酒精浓度的酒精浓度传感器,对从发动机排出的用于产生空气/燃料比反馈信号的废气的氧含量敏感的氧传感器,以及控制 耦合到酒精浓度传感器和氧传感器的单元,用于控制计量到发动机的燃料量。 控制单元基于发动机工作条件计算出计量到发动机的燃料量的基本值,并校正所计算出的感测酒精浓度的基本值。 基于空气/燃料比与化学计量值的偏差来计算设定在由预定上限和下限限定的控制范围内的校正因子。 基于所计算的校正因子来校正所计算的基本值,以提供闭环空燃比控制。 在醇浓度信号变化超过预定程度的情况下,改变上限和下限以扩大控制范围。