SCR catalyst crystallization detection method, detection device and clearing device

A technology of SCR catalytic converter and detection method, which is applied in the diagnosis device of exhaust treatment device, electronic control of exhaust treatment device, machine/engine, etc., can solve the problem that crystallization fault cannot be effectively identified, and achieve the reduction of DPF active Regeneration times, protection life, anti-aging effect

Active Publication Date: 2021-01-29
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The embodiment of the present application provides a crystallization detection method, detection device and removal device for an

Method used

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  • SCR catalyst crystallization detection method, detection device and clearing device
  • SCR catalyst crystallization detection method, detection device and clearing device
  • SCR catalyst crystallization detection method, detection device and clearing device

Examples

Experimental program
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Effect test

Embodiment 1

[0051] figure 1 It is a schematic flow chart of a crystallization detection method for an SCR catalyst, comprising the following steps:

[0052] S1: Receive a crystallization detection instruction.

[0053] After the engine is powered on and started, receive crystallization detection command. Preferably, before receiving the crystallization detection instruction, it is judged whether the engine is in a special working state, if the engine is in a normal working state, then start to accumulate running time and fuel consumption and perform SCR crystallization detection; otherwise, abandon this detection process and reset the crystallization detection parameters. Among them, the normal working state means that the engine water temperature is suitable, and the engine is not running in a special working state. The special working state includes rapid warm-up, exhaust temperature management, active DPF regeneration, desulfurization regeneration, crystallization removal, engine bra...

Embodiment 2

[0067] On the basis of embodiment 1:

[0068]Before judging the crystallization state of the SCR catalyst according to the deviation value, if DPF complete active regeneration, SCR complete desulfurization regeneration and SCR complete decrystallization regeneration occur at the same time or any one of them occurs, it is necessary to judge DPF complete active regeneration and SCR complete desulfurization regeneration , SCR complete decrystallization regeneration is over respectively, if any one of DPF complete active regeneration, SCR complete desulfurization regeneration and SCR complete decrystallization regeneration ends, set the running time and fuel consumption to zero and repeat the steps from S1 to S4 Preset the number of times, get all the deviation values ​​and calculate the average value of the deviation values; judge whether the average value is greater than the preset threshold value, if so, stop the detection of crystallization and output a vehicle failure reminder...

Embodiment 3

[0071] On the basis of embodiment 2:

[0072] After all the deviation values ​​are obtained and the average value of the deviation values ​​is calculated, the correction coefficient is calculated according to the average value, and the pre-calibrated intake air volume is corrected based on the correction coefficient to obtain the corrected intake air volume, and the corrected intake air volume is updated as The current pre-calibrated intake air volume.

[0073] Specifically, due to the accumulative growth of DPF ash and the differences in the manufacturing consistency of engines and after-treatment systems, including differences in gas path structure and performance, and differences in sealing due to assembly tolerances, it is necessary to use the correction coefficient α to correct the pre-calibration The intake air volume is corrected and the corrected intake air volume is obtained, and the corrected intake air volume is updated to the current pre-calibrated intake air volum...

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Abstract

The invention relates to an SCR catalyst crystallization detection method, a detection device and a clearing device, and relates to the technical field of engine after-treatment control. Real-time acquisition and accumulation of the actual intake air volume of an intake and exhaust system and the pre-calibrated intake air volume in an uncrystallized state are carried out, the crystallization stateof an SCR catalyst can be recognized according to an intake air volume deviation value calculated according to the actual intake air volume total value and the pre-calibrated intake air volume totalvalue, and when it is detected that the SCR catalyst has a light crystallization fault, an exhaust temperature management unit can be used for adjusting own control parameters of an engine to roughlyremove crystals, and when it is detected that the SCR catalyst has the severe crystallization fault, the crystals can be thoroughly removed through a DPF active regeneration unit, so that the crystallization fault in the SCR catalyst can be effectively recognized, and different removing measures can be taken for crystallization states of different degrees to prevent the SCR catalyst from being subjected to severe influence caused by crystallization.

Description

technical field [0001] The present application relates to the technical field of engine post-treatment control, and in particular to a crystallization detection method, detection device and removal device of an SCR catalytic converter. Background technique [0002] SCR (Selective Catalytic Reduction, Selective Catalytic Reduction Technology) is a treatment process for NOx in diesel vehicle exhaust emissions, that is, under the action of a catalyst, the reducing agent ammonia or urea is injected to reduce the NOx in the exhaust gas to N 2 and H 2 O. With the rapid development and continuous improvement of SCR technology, it is widely used in the aftertreatment of diesel engine exhaust, effectively making the exhaust NOx emission level meet the regulatory requirements. However, when the exhaust gas of the post-treatment system cannot provide enough heat for the urea solution sprayed into the muffler to evaporate and hydrolyze, urea crystallization is prone to occur, and acco...

Claims

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Application Information

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IPC IPC(8): F01N11/00
CPCF01N11/00F01N2570/14F01N2610/02Y02T10/40
Inventor 李林程欢白桃李郑攀周杰敏陈玉俊蒋学锋
Owner DONGFENG COMML VEHICLE CO LTD
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