DPF carbon load initialization self-learning method for diesel

Abstract

The invention provides a DPF carbon load initialization self-learning method for a diesel. The DPF carbon load initialization self-learning method for the diesel comprises the following steps: when anengine is in a shutdown state, providing the DPF with constant air mass flow through the operation of a fan; performing high-temperature regeneration treatment on the DPF first when the DPF satisfiesa regeneration mechanism condition; then, measuring the pressure difference of a DPF carrier; converting to obtain the flow resistance of the DPF according to the air mass flow which flows through the DPF carrier, the volume of the DPF carrier and the pressure difference of the DPF carrier when the pressure difference of the DPF carrier is measured; querying the corresponding relation table of flow resistance and carbon load calibrated previously to obtain the carbon load corresponding to the flow resistance at the moment; subtracting the carbon load from zero at the moment to obtain the deviation value of the carbon load; and adding the deviation value to the corresponding relation table of the flow resistance and the carbon load calibrated previously so that the data of the carbon loadhave an overall offset, and namely, obtaining a new corresponding relation table of the flow resistance and the carbon load. According to the method, the influence on the calculation of the DPF carbonload caused by the processing error of different carriers can be eliminated.

Description

technical field [0001] The invention relates to the technical field of diesel engine exhaust after-treatment, in particular to a self-learning method for initializing the DPF carbon load of a diesel engine. Background technique [0002] The main technical route of after-treatment of diesel engine exhaust in China VI stage is DOC+DPF+SCR. At present, the test of DPF carbon load is based on the pressure difference under different exhaust mass flow or calculated based on the carbon load model. However, there are differences in the processing process of different DPF carriers. The deviation of the flow resistance of different carriers in the same batch (the ratio of the DPF pressure difference to the volume flow of the air passing through the carrier) is about 10%. This deviation is generated during the production process of the carrier and is inevitable. ; The DPF carrier is coated with an oxide coating material, and the deviation is amplified to about 15%. The flow resistance ...

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Problems solved by technology

However, there are differences in the processing process of different DPF carriers. The deviation of the flow resistance (the ratio of DPF pressure difference to the volume flow rate of air passing through the carrier) of different carriers in the same batch is about 10%. This deviation is caused by the carrier production process and is inevitable. ;The DPF carrier is coated with an oxide coating material, and the deviation is enlarged to about 15%. The deviation of the flow resistance directly leads to the deviation of the carbon load measurement. Because the DPF carbon load and the flow resistance are in one-to-one correspondence, the change of the flow resistance directly leads to carbon load change

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