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    • 4. 发明授权
    • Air-fuel ratio control device for internal combustion engine and method thereof
    • 用于内燃机的空燃比控制装置及其方法
    • US06453229B1
    • 2002-09-17
    • US09691209
    • 2000-10-19
    • Shigeo OhkumaKoji TakahashiSatoru WatanabeHajime HosoyaHidekazu YoshizawaHaruhiro Iwaki
    • Shigeo OhkumaKoji TakahashiSatoru WatanabeHajime HosoyaHidekazu YoshizawaHaruhiro Iwaki
    • F02D4114
    • F02D41/1403F02D41/1454F02D2041/1422F02D2250/12
    • In an air-fuel ratio feedback control of an internal combustion engine aimed to approximate an air-fuel ratio to a target air-fuel ratio set according to operating conditions of the engine, the feedback control is carried out using the feedback control amount which is computed according to a sliding mode control, having a deviation between the target air-fuel ratio and the detected air-fuel ratio detected by the air-fuel ratio sensor set as a switching function. According to the present invention, a simple air-fuel ratio feedback control is carried out according to an accurate sliding mode control with no dispersion for each engine, that is easy to design, and that can be applied generally to any kind of vehicle or engine. Further, by varying the feedback gain depending on operating conditions, by controlling the computing cycle of the feedback control amount, or by performing a Smith dead time compensation control, the influence provided by the dead time element existing in the control object is eliminated, thereby ensuring the response characteristic and stability of the control system.
    • 在旨在将空燃比近似为根据发动机的运转条件设定的目标空燃比的内燃机的空燃比反馈控制中,使用反馈控制量进行反馈控制 根据滑动模式控制计算出具有由作为切换功能的空燃比传感器检测出的目标空燃比与检测空燃比之间的偏差。 根据本发明,简单的空燃比反馈控制是根据准确的滑动模式控制执行的,每个发动机没有分散,易于设计,并且可以普遍适用于任何种类的车辆或发动机 。 此外,通过根据操作条件改变反馈增益,通过控制反馈控制量的计算周期,或者通过执行史密斯死时补偿控制,消除由存在于控制对象中的死区元素提供的影响,由此 确保控制系统的响应特性和稳定性。