Frequent regeneration diagnosis method for diesel particle filter

Abstract

The invention discloses a method for diagnosing whether regeneration of a diesel particle filter of a diesel vehicle is frequent or not. Scheduled work condition parameters and a scheduled recording period set in advance in the S10 and S20 and the maximum allowed frequency, pre-determined on the basis of the waste gas exhaust requirement of the diesel vehicle in the S30, of regeneration of the diesel particle filter within the recording period are stored in a diesel vehicle. The method comprises the steps that the completing frequency of regeneration of the diesel particle filter is recorded in the recording period; in the S40, the recorded completing frequency is compared with the maximum allowed frequency, and in the S52, if the recorded completing frequency is larger than the maximum allowed frequency, frequent generation happens to the diesel particle filter; and in the S 51, if the recorded completing frequency is not larger than the maximum allowed frequency, it is confirmed that the regeneration frequency of the diesel particle filter is normal, meanwhile, the recording period is reset, and the completing frequency of generation of the diesel particle filter is recorded again.

Description

technical field [0001] The invention relates to a frequent regeneration diagnosis method of a diesel particulate matter filter. Background technique [0002] In order to cope with the increasingly stringent emission requirements of diesel vehicles, diesel particulate filters (DPF) are widely used in diesel vehicles. The diesel particulate filter is mainly installed in the exhaust emission treatment system of diesel vehicles, which can filter out most of the pollutant particles (PM) in the engine exhaust, so as to make the exhaust emission comply with the regulations. [0003] However, as the soot particles accumulate in the diesel particulate filter over time, this in turn will not only affect the filtering effect, but also affect the engine efficiency due to the increase in exhaust back pressure. Therefore, the diesel particulate filter needs to be regenerated at regular intervals when certain conditions are met. Common regeneration involves heating the interior of the DP...

AI Technical Summary

Problems solved by technology

However, for heavy-duty diesel vehicles with a large engine displacement (for example, more than 6 liters), the exhaust pressure difference does not change significantly due to its large displacement, and in most cases it is impossible to accurately measure The amount of soot particles that have accumulated in the diesel particulate matter filter can be obtained by reverse calculation, which will cause the phenomenon that cannot be diagnosed by traditional methods when the regeneration frequency of the diesel particulate matter filter is too high

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