Construction method of DPF (diesel particulate filter) carbon loading model

Abstract

The invention relates to the technical field of engine postprocessors, and particularly discloses a construction method of a DPF (diesel particulate filter) carbon loading model. According to the construction method of the DPF carbon loading capacity model, the carbon loading capacity of the DPF corresponding to different fixed mileages when the whole vehicle travels is obtained, the corresponding fixed mileage when the DPF carbon is fully loaded is the actual regeneration mileage of the DPF, and the actual carbon loading rate ratio corresponding to the actual regeneration mileage is obtained by looking up a table according to the actual regeneration mileage of the DPF; the actual carbon-loaded rate ratio is compared with the simulated carbon-loaded rate ratio of the output DPF carbon-loaded off-line simulation model, if the error is smaller than the error preset value, the DPF carbon-loaded off-line simulation model meets the design requirement, the construction method adopts a forward calibration mode, the advantages of the accuracy of a road test and the high efficiency of off-line simulation are combined, accurate prediction of the carbon loading capacity of the DPF in various application scenes is achieved, and therefore regeneration of the DPF can be effectively and safely conducted in time in the actual running process of the whole vehicle.

Description

technical field [0001] The invention relates to the technical field of engine post-processors, in particular to a method for constructing a DPF carbon load model. Background technique [0002] With the development of the automobile industry and the improvement of environmental protection requirements, the country has higher and higher requirements for automobile emissions, and puts forward stricter requirements for the emission of particulate matter from diesel engines. getting stricter. As an important part of the off-board purification system, the engine after-treatment system plays an important role in reducing the content of exhaust pollutants. [0003] At present, DPF is widely used in the National VI diesel engine platforms of various manufacturers. The regeneration safety of DPF is one of the most important links in the stable operation of the engine aftertreatment system. The regeneration safety of DPF is mainly affected by factors such as regeneration temperature ...

AI Technical Summary

Problems solved by technology

[0004] The traditional method of predicting the carbon load of DPF, the simplest one is periodic protection regeneration such as mileage, time or fuel consumption, but it cannot meet the different application scenarios of the whole vehicle, such as mixed road conditions in urban and suburban areas, and the fixed carbon load mileage will be difficult Use the same set of data to determine, and a fixed regeneration cycle often leads to frequent or untimely regeneration

There is also a new carbon load prediction model based on DPF-related sensors, but this method relies on the stable working status of the sensors and the consistency of different vehicles. If there is a deviation or consistency problem in the sensor measurement, it will directly lead to model failure

In the prior art, there is also a method to calibrate and correct the model through repeated offline simulations until the simulation results are consistent with the carbon loading of the vehicle test, and then piece together the test results through simulation. This method consumes a lot of time in offline simulation. In addition, this method still has certain limitations for the carbon load prediction of various mixed road conditions

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