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

By calculating the conversion efficiency of the oxidation catalyst based on engine status and hydrogen concentration, the problem of lack of fault detection in existing technologies is solved, enabling efficient fault detection of aftertreatment systems with oxidation catalysts and reducing the risk of hydrogen emissions.

CN118855579BActive Publication Date: 2026-05-26WEICHAI POWER CO LTD
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Patent Information

Application Number
CN202411116368.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-08-14
Publication Date
2026-05-26
Estimated Expiration
2044-08-14

AI Technical Summary

Technical Problem

Existing technologies lack methods for detecting faults in aftertreatment systems with oxidation catalysts, especially in the event of a hydrogen engine misfire, where high hydrogen concentrations may lead to excessive emissions that could impact the environment or even cause a fire hazard.

Method used

By acquiring engine status, misfire fault status, catalyst inlet temperature and speed, and determining preset conditions, the oxidation catalyst conversion efficiency is calculated to determine whether the aftertreatment system has malfunctioned. Preset conditions include engine power-on, misfire fault triggering, catalyst inlet temperature and speed reaching thresholds. Efficiency is calculated using hydrogen concentration and multiple tests are set to improve accuracy.

Benefits of technology

This improves the accuracy of fault detection in the aftertreatment system, ensuring that a decline in the efficiency of the oxidation catalyst can be detected in a timely manner, thus avoiding excessive hydrogen emissions and reducing environmental risks.

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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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