Method and device for detecting a failure of an aftertreatment system with an oxidation catalyst

Abstract

This application provides a fault detection method and apparatus for an aftertreatment system with an oxidation catalyst. By considering that the current engine state is energized, the current misfire fault state is triggered, the current catalyst inlet temperature is greater than or equal to a preset ignition temperature, and the current engine speed is greater than or equal to a preset speed, the accuracy of judging whether the aftertreatment system has malfunctioned based on the current oxidation catalyst conversion efficiency is improved. Ultimately, the fault of the aftertreatment system is determined at least based on the magnitude of the current oxidation catalyst conversion efficiency. The malfunction of the aftertreatment system is characterized by a decrease in the efficiency of the oxidation catalyst, thereby achieving the purpose of fault detection for an aftertreatment system with an oxidation catalyst, and thus solving the problem that existing solutions lack a fault detection method for an aftertreatment system with an oxidation catalyst.

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