A method and system for avoiding frequent regeneration of a particulate filter

Abstract

This invention proposes a method and system for avoiding frequent regeneration of particulate matter filters (DPFs), relating to the field of emission control technology. The method includes: Step 1: Obtaining the steady-state differential pressure value after engine regeneration, along with the baseline differential pressure and the standard differential pressure value under the current carbon load; Step 2: Calculating the deviation of the steady-state differential pressure value from the standard differential pressure value and the percentage deviation from the baseline differential pressure; Step 3: Based on the percentage deviation and air velocity, consulting the ash correction map to obtain the current correction coefficient; Step 4: Determining whether the current correction coefficient is less than a preset value. If so, the product of the current correction coefficient and the current carbon load trigger limit is used as the carbon load trigger limit for the next regeneration; otherwise, service regeneration is performed, and the carbon load trigger limit is reset to its initial value after service regeneration. This invention utilizes the deviation between the no-load DPF differential pressure and the differential pressure after regeneration to correct the regeneration limit, ensuring that regeneration only occurs when carbon deposits reach a certain level, avoiding shortened regeneration time or even frequent regeneration due to ash content, thus reducing fuel consumption.

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