Method for decontaminating diesel engine system devoid of nitrogen oxide trap in car, involves initiating rich mode corresponding to decreased rate of oxygen gas entering catalyst chamber to improve efficiency of oxidation catalyst

摘要

The method involves initiating a rich mode corresponding to a decreased rate of oxygen gas entering a catalyst chamber (111) to improve the efficiency of an oxidation catalyst of a diesel engine system (1). A measurement value of a distance covered is measured, and the received measured value is compared with a threshold, where the initiation of the rich mode is a function of the comparison result. An estimated value of efficiency parameter of the oxidation catalyst is received, and the value of the efficiency parameter is compared with a threshold value. Independent claims are also included for the following: (1) a device for decontaminating a diesel engine system devoid of the nitrogen oxide trap (2) a diesel engine system devoid of the nitrogen oxide trap.