Diagnosis method of too high regeneration frequency of diesel particulate filter

Abstract

The invention belongs to the technical field of diesel engines, and particularly discloses a diagnosis method of the too high regeneration frequency of a diesel particulate filter (DPF). The diagnosismethod specifically includes the following steps of firstly, starting from the success of the last active regeneration of the DPF, accumulating the operation time of the DPF from zero; secondly, comparing whether the operation time, mileage and oil consumption of the DPF exceed judgment thresholds or not when the DPF enters the current active regeneration, if not, judging that the regeneration frequency of the DPF is too high, otherwise, judging that the regeneration frequency of the DPF is normal; and thirdly, resetting the operation time of the DPF if the current active regeneration of theDPF succeeds and entering the next diagnosis cycle. The diagnosis of the too high regeneration frequency of the DPF is based on the carbon accumulation time, mileage and oil consumption in the periodfrom the success of the last regeneration to the current regeneration, factors are comprehensively considered, and the diagnosis is accurate and efficient.

Description

technical field [0001] The invention belongs to the technical field of diesel engines, in particular to a diagnosis method for excessively high regeneration frequency of a particulate filter of a diesel engine. Background technique [0002] The excessively high regeneration frequency of the existing particulate filter is mainly based on the carbon accumulation time and the DPF pressure difference between the last successful regeneration and the current regeneration, only based on the carbon accumulation time without comprehensive consideration of mileage and fuel consumption, in some special working conditions If the regeneration frequency of the particle filter is too high, the diagnosis will fail. According to the DPF differential pressure, the reliability and accuracy of the DPF differential pressure sensor are high. When the sensor is damaged or the accuracy drops, the regeneration frequency of the particle filter will also be reduced. High diagnostic failure. [0003] ...

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Problems solved by technology

[0004] The present invention provides a diagnostic method based on time, mileage and fuel consumption for excessively high regeneration frequency of diesel particulate filter, mainly to meet the requirements of DPF monitoring in diesel engine national VI emission regulations, and at the same time, engine combustion deterioration, post-treatment carrier When problems such as deterioration, sensor and actuator failure, pipeline air leakage, and engine oil consumption lead to excessive carbon accumulation in the DPF, the user can be guided to repair in time to prevent further damage to the post-processing system and solve the problem of existing diesel engines. The above-mentioned deficiencies in the diagnostic method of excessive particulate filter regeneration frequency

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