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    • 17. 发明授权
    • Exhaust gas purification system for internal combustion engine
    • 内燃机排气净化系统
    • US07980059B2
    • 2011-07-19
    • US12097072
    • 2006-12-14
    • Daisuke ShibataHiroshi Sawada
    • Daisuke ShibataHiroshi Sawada
    • F01N3/00
    • B01D53/9431B01D53/9495F01N3/0807F01N3/0842F01N3/0878F01N3/2053F01N3/206F01N11/00F01N2550/03F01N2560/026Y02T10/47
    • An object is to estimate the degree of deterioration of an NOx catalyst with improved accuracy in an exhaust gas purification system having the NOx catalyst provided in an exhaust passage. According to the present invention, an NOx sensor is provided downstream of an NOx catalyst, and the difference between an estimated value of the NOx concentration in the exhaust gas in the exhaust passage upstream of the NOx catalyst and a detection value of the NOx sensor at a time when NOx in the exhaust gas is not removed in the NOx catalyst is calculated. In addition, in estimating the degree of deterioration of the NOx catalyst, the estimated value of the NOx concentration in the exhaust gas in the exhaust passage upstream of the NOx catalyst is corrected based on this difference, and the degree of deterioration of the NOx catalyst is estimated based on the difference between this corrected value and the detection value of the NOx sensor.
    • 本发明的目的是在具有设置在排气通路中的NOx催化剂的排气净化系统中,通过提高精度来估计NOx催化剂的劣化程度。 根据本发明,NOx传感器设置在NOx催化剂的下游,NOx排出通道上游排气中的排气中NOx浓度的估计值与NOx传感器的检测值之间的差值 计算在NOx催化剂中未排出废气中的NOx的时间。 此外,在推定NOx催化剂的劣化程度时,基于该差异来校正NOx催化剂上游排气通路中的排气中的NOx浓度的推定值,NOx催化剂的劣化程度 基于该校正值与NOx传感器的检测值之间的差异来估计。