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    • 38. 发明授权
    • Air-fuel ratio control system for internal combustion engines
    • 内燃机空燃比控制系统
    • US5852930A
    • 1998-12-29
    • US833091
    • 1997-04-04
    • Yuji YasuiShusuke AkazakiKohei Hanada
    • Yuji YasuiShusuke AkazakiKohei Hanada
    • F02D41/14F01N3/00
    • F02D41/1473F02D41/1403F02D41/1441F02D2041/1409F02D2041/1415F02D2041/1416F02D2041/1418F02D2041/142F02D2041/1426F02D2041/1431F02D2041/1433F02D41/1402F02D41/1456
    • An air-fuel control system for use with an internal combustion engine has a catalytic converter disposed in an exhaust system of the engine, for purifying an exhaust gas emitted from the engine, a first exhaust gas sensor disposed in the exhaust system for detecting an air-fuel ratio of the exhaust gas upstream of the catalytic converter, a second exhaust gas sensor disposed in the exhaust system for detecting the concentration of a component of the exhaust gas which has passed through the catalytic converter, downstream of the catalytic converter, and a control unit for controlling an air-fuel ratio of the engine based on outputs from the first exhaust gas sensor and the second exhaust gas sensor. The control unit includes an adaptive sliding mode controller for determining a correction quantity to correct the air-fuel ratio of the engine so as to equalize the concentration of the component of the exhaust gas downstream of the catalytic converter to a predetermined appropriate value, according to an adaptive sliding mode control process based on the output from the second exhaust gas sensor, and a feedback controller for controlling a rate at which fuel is supplied to the engine so as to converge the concentration of the component of the exhaust gas downstream of the catalytic converter toward the predetermined appropriate value, based on the correction quantity and the output from the first exhaust gas sensor.
    • 一种与内燃机一起使用的空气燃料控制系统,具有设置在发动机的排气系统中的用于净化从发动机排出的排气的催化转化器,设置在排气系统中的第一排气传感器,用于检测空气 - 催化转化器上游排气的燃料比,设置在排气系统中的第二废气传感器,用于检测通过催化转化器的排气的成分浓度,催化转化器的下游,以及 控制单元,用于基于来自第一排气传感器和第二排气传感器的输出来控制发动机的空燃比。 控制单元包括自适应滑动模式控制器,用于确定校正量以校正发动机的空燃比,以便将催化转化器下游的排气的分量的浓度相等到预定的适当值,根据 基于来自第二废气传感器的输出的自适应滑动模式控制过程和用于控制向发动机供应燃料的速率的反馈控制器,以使催化剂下游的排气的组分的浓度 转换器基于校正量和来自第一废气传感器的输出而朝向预定的适当值。