Parkhurst & Wendel
Method for detection of performance reduction of exhaust gas purification catalyst
 A method for detecting the performance reduction of an exhaust gas purification catalyst by examining the temperature of an exhaust gas flowing into the catalyst, necessary for the activation of the catalyst. This method enables accurate detection of the performance reduction of an exhaust gas purification catalyst without conducting a constant-speed vehicle operation for a long time. 
NGK Insulators, Ltd.
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Nobuhide
Kato