A method for detecting crystallization of an SCR catalyst, a detection device and a removal device

A technology of SCR catalyst and detection method, which is applied in the diagnosis device of exhaust gas treatment device, electronic control of exhaust gas treatment device, machine/engine, etc., can solve the problem that crystallization failure cannot be effectively identified, and reduce active regeneration. The number of times, the change is good in real time, and the effect of protecting the service life

Active Publication Date: 2021-12-07
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present application provides a crystallization detection method, detection device and removal device for an SCR catalyst to solve the problem that the crystallization failure in the SCR catalyst cannot be effectively identified in the related art

Method used

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  • A method for detecting crystallization of an SCR catalyst, a detection device and a removal device
  • A method for detecting crystallization of an SCR catalyst, a detection device and a removal device
  • A method for detecting crystallization of an SCR catalyst, a detection device and a removal device

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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 application relates to a SCR catalytic converter crystallization detection method, detection device and removal device, and relates to the technical field of engine post-processing control, through real-time collection of the actual intake air volume of the intake system and the pre-calibrated intake air volume in the uncrystallized state and accumulated, and the deviation value of the intake air amount calculated according to the total value of the actual intake air amount and the total value of the pre-calibrated intake air amount can identify the crystallization state of the SCR catalytic converter, and when a slight crystallization fault is detected in the SCR catalytic converter, The crystallization can be roughly eliminated by adjusting the engine’s own control parameters through the exhaust temperature management unit, and when severe crystallization faults are detected in the SCR catalytic converter, the crystallization can be completely removed through the DPF active regeneration unit. Therefore, this application can not only effectively identify For crystallization faults in the SCR catalyst, different cleaning measures can be taken for different degrees of crystallization states, so as to avoid the adverse effects of crystallization on the SCR catalyst.

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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Patent Type & Authority Patents(China)
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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