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A dpf carbon load estimation method and system

A DPF, carbon loading technology, applied in the direction of electronic control of exhaust gas treatment devices, machines/engines, mechanical equipment, etc., can solve the problem of inaccurate estimation of DPF carbon loading

Active Publication Date: 2022-03-15
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the defects existing in the prior art, the object of the present invention is to provide a method and system for estimating the carbon load of DPF, which can solve the problem of inaccurate estimation of the carbon load of DPF in the prior art

Method used

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  • A dpf carbon load estimation method and system
  • A dpf carbon load estimation method and system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The invention provides a method for estimating the carbon load of a DPF, comprising the following steps:

[0048] S1: Get the pressure difference before and after the DPF when the vehicle is running;

[0049] S2: Call the initial flow resistance coefficient and the residual ash flow resistance coefficient of the last self-learning, and combine the pressure difference before and after the DPF when the vehicle is running, to obtain the pressure drop caused by the initial flow resistance and the pressure drop caused by the residual ash under the current pressure difference;

[0050] S3: According to the pressure difference before and after the current DPF and the pressure drop caused by the initial flow resistance and the pressure drop caused by the residual ash under the pressure difference, the carbon loading of the DPF is obtained.

[0051] When using the DPF carbon load estimation method, after the active regeneration of the DPF is complete, in the next soot accumulati...

Embodiment 2

[0053] On the basis of Embodiment 1, the residual ash flow resistance coefficient of self-learning is obtained according to the following steps:

[0054] When the carbon load of DPF reaches the set threshold, DPF regeneration is started;

[0055] When the DPF satisfies the self-learning conditions of the ash flow resistance coefficient, obtain the pressure difference before and after the DPF after DPF regeneration, and calculate the pressure drop caused by the initial flow resistance under the current pressure difference by combining the initial flow resistance coefficient to obtain the residual ash generated by the DPF regeneration. pressure drop;

[0056] According to the pressure drop generated by the residual ash generated by DPF regeneration, the residual ash flow resistance coefficient after DPF regeneration is obtained as the self-learning residual ash flow resistance coefficient to replace the previous self-learning residual ash flow resistance coefficient;

[0057] A...

Embodiment 3

[0062] On the basis of Embodiment 1, obtaining the initial flow resistance coefficient may include the following steps:

[0063] Obtain the pressure difference between the front and rear ends of the DPF when it is initially installed; calculate the initial flow resistance coefficient of the DPF when it is initially installed according to the pressure difference between the front and rear ends of the DPF when it is initially installed.

[0064] In this embodiment, when the DPF is initially installed, the pressure difference between the front and rear ends of the DPF is used to obtain the initial flow resistance coefficient of the DPF when it is initially installed, which can make the initial flow resistance coefficient more accurate, so that it can be obtained in the next accumulation cycle. The pressure drop caused by the initial flow resistance. In some other embodiments, the initial flow resistance coefficient may also be obtained through DPF manufacturer's design parameters...

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Abstract

The invention relates to the technical field of post-treatment of internal combustion engine exhaust, in particular to a method and system for estimating the carbon load of a DPF. The method includes the following steps: obtaining the pressure difference before and after the DPF when the vehicle is running; calling the initial flow resistance coefficient and the residual ash flow resistance coefficient of the DPF last self-learning, and combining the pressure difference before and after the DPF when the vehicle is running, to obtain the initial flow resistance coefficient under the current pressure difference. The pressure drop caused by the flow resistance and the pressure drop caused by the residual ash; according to the pressure drop before and after the current DPF and the pressure drop caused by the initial flow resistance and the pressure drop caused by the residual ash under the pressure difference, the pressure drop related to the carbon load is obtained , so as to obtain the carbon load of the current DPF. The present application can solve the problem of inaccurate estimation of DPF carbon load in the prior art.

Description

technical field [0001] The invention relates to the technical field of post-treatment of internal combustion engine exhaust, in particular to a method and system for estimating the carbon load of a DPF. Background technique [0002] Diesel Particulate Filter (DPF) is an essential post-processing device for diesel engines to meet emission regulations. DPF traps the particulate matter (Particulate Matter, PM) in the exhaust of the diesel engine through physical filtration to reduce the PM emission of the diesel engine. With the accumulation of particulate matter in the DPF pores, the pressure drop of the DPF will become larger and larger, which will increase the exhaust back pressure of the engine, deteriorate the fuel consumption of the engine, and even directly block the exhaust pipe in severe cases, resulting in engine damage. Therefore, during the use of the DPF, it is generally necessary to periodically perform regeneration operations on the DPF to oxidize and remove the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00F01N3/022
CPCF01N11/002F01N3/022F01N11/00Y02T10/40
Inventor 李芳韩虎王梅俊杨晓莹郑攀程欢李林白桃李陈玉俊周杰敏张衡
Owner DONGFENG COMML VEHICLE CO LTD