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    • 1. 发明授权
    • Device for diagnosing oxygen sensor deterioration
    • 用于诊断氧传感器劣化的装置
    • US5927260A
    • 1999-07-27
    • US949324
    • 1997-10-03
    • Youichi KishimotoAkio Katayama
    • Youichi KishimotoAkio Katayama
    • F02D45/00F02D41/14F02D41/22
    • F02D41/1495F02D41/1456
    • The air/fuel ratio of an engine is feedback controlled based upon the output of an oxygen sensor. The control includes proportional control and also correction of a control variable for this proportional control according to the actual air/fuel ratio. The period of the output signal of the oxygen sensor during feedback control is measured, a decision value is set corresponding to change in the control variable, and deterioration of the oxygen sensor is determined by comparing the period of the output signal with the decision value. By doing this, change in the control variable is prevented from exerting any influence upon the period of the output signal of the oxygen sensor, and the accuracy of deterioration diagnosis for the oxygen sensor is enhanced.
    • 基于氧传感器的输出,对发动机的空燃比进行反馈控制。 该控制包括比例控制,并根据实际的空气/燃料比对该比例控制的控制变量进行校正。 测量反馈控制期间氧传感器的输出信号的周期,对应于控制变量的变化设定判定值,并且通过将输出信号的周期与判定值进行比较来确定氧传感器的劣化。 通过这样做,可以防止控制变量的变化对氧传感器的输出信号的周期产生任何影响,提高氧传感器的劣化诊断精度。