Diesel particulate filter regeneration optimization method based on external heat proportion

By defining the external heat ratio parameter, a diesel particulate trap model and an energy transfer model are constructed, which solves the problem of insufficient weighting of external heating and soot auto-combustion heat release in traditional studies, and realizes accurate stage identification and safe and efficient thermal management of the regeneration process.

CN122428993APending Publication Date: 2026-07-21HUNAN INSTITUTE OF ENGINEERING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN INSTITUTE OF ENGINEERING
Filing Date
2026-06-16
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Traditional research has failed to effectively quantify the relative weights of external heating and soot auto-ignition heat release during the regeneration process of diesel particulate filters. This makes it impossible to accurately determine the regeneration process stage and formulate a refined control strategy, which may lead to problems such as excessively high temperature or combustion shutdown.

Method used

Define the external heat ratio parameter, construct a single-channel model of the diesel particulate filter and a solid-phase control volume energy transfer model, calculate the ratio of external heat flow rate to total heat flow rate, identify the regeneration process stage and adjust the operating parameters to ensure that the system completes the transition from preheating to self-sustaining combustion within a safe temperature window.

Benefits of technology

It provides quantitative tools to reveal the common patterns of regeneration thermal behavior, accurately identify the stages of the regeneration process, achieve refined thermal management, avoid the risk of decreased regeneration efficiency or thermal stress, and balance the safety and efficiency of DPF.

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Abstract

The application discloses a diesel particulate filter regeneration optimization method based on external heat proportion, comprising the following steps: S1, constructing a DPF single-channel model and a solid-phase control body energy transmission model; S2, defining the external heat proportion as the ratio of the external heat flow rate to the total heat flow rate of the system; S3, calculating the soot combustion heat release rate and the external heat flow rate based on the model, and determining the external heat proportion; S4, identifying the stage of the regeneration process according to the change trend of the external heat proportion with the regeneration time or the solid-phase temperature; and S5, based on the stage identification result and the real-time value of the external heat proportion, synergistically controlling at least one parameter in the oxygen concentration, the initial temperature, the soot load and the exhaust mass flow rate, so that the system completes the transition from the external heating dominance to the soot self-sustaining combustion within the safe temperature window. The application improves the relative weight of external heating and soot self-ignition heat release to the level of heat source composition for unified measurement, and identifies the regeneration process and controls based on the external heat proportion.
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