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1. 发明授权

US5255515A Method and arrangement for obtaining an evaluation value for the performance loss of a catalytic converter 失效
标题翻译：获得催化转化器性能损失评估值的方法和装置
公开(公告)号：US5255515A
公开(公告)日：1993-10-26
申请号：US981844
申请日：1992-11-25
申请人： Andreas Blumenstock , Ernst Wild , Helmut Denz , Klaus Ries-Muller
发明人： Andreas Blumenstock , Ernst Wild , Helmut Denz , Klaus Ries-Muller
IPC分类号： F01N3/20 , F01N11/00 , F02B77/08 , F02D35/00 , G01M15/04 , G01N33/00 , F07N3/20
CPC分类号： F01N11/007 , F01N2550/02 , Y02T10/47
摘要： The invention is directed to a method for obtaining a value for evaluating the performance loss of a catalytic converter with the aid of a forward signal of a forward gas probe mounted forward of the catalytic converter and a rearward signal of a rearward gas probe mounted rearward of the catalytic converter, the catalytic converter being connected to an internal combustion engine. The method includes the steps of: carrying out the method during the steady-state operation of the engine; multiplying the forward signal and the rearward signal with each other to form a plurality of products; averaging the products over a plurality of oscillations of the forward signal to obtain a mean value; and, utilizing the mean value as a value for evaluating the performance loss of the catalytic converter. This correlation method can be varied in different ways and especially in that the forward-probe signal is correlated without or with phase shift with the rearward-probe signal. A cross-correlation factor or the real or imaginary component of an orthogonal correlation or other correlation values are obtained in dependence upon the nature of the correlation. These correlation values are used for evaluating the performance loss of the catalytic converter. The evaluation of the performance loss of the catalytic converter with the aid of these correlation values is very significantly more reliable than the evaluation with the aid of amplitudes or amplitude mean values of the probe signals.
摘要翻译：本发明涉及一种用于通过安装在催化转化器前方的正向气体探针的前向信号和后方气体探针的向后信号获得用于评估催化转化器的性能损失的值的方法，催化转化器，催化转化器连接到内燃机。该方法包括以下步骤：在发动机的稳态运行期间执行该方法; 将前向信号和后向信号彼此相乘以形成多个乘积; 在正向信号的多个振荡中对产品进行平均以获得平均值; 并利用平均值作为评价催化转化器的性能损失的值。该相关方法可以以不同的方式变化，特别是前向探针信号与后向探测信号无相关或相移相关。取决于相关性质，获得正交相关或其他相关值的互相关因子或实分量或虚分量。这些相关值用于评估催化转化器的性能损失。借助于这些相关值对催化转化器的性能损失的评估与借助于探测信号的幅度或振幅平均值的评估相比非常显着更可靠。

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