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Control method capable of achieving SCR desulfurization regeneration

A control method and sulfur poisoning technology, which are applied in the electronic control of exhaust gas treatment devices, diagnostic devices of exhaust gas treatment devices, exhaust gas treatment, etc. Inaccurate results, etc., to achieve the effect of convenient SCR desulfurization regeneration control, reasonable design and accurate prediction

Active Publication Date: 2020-01-17
DONGFENG COMML VEHICLE CO LTD
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  • Claims
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Problems solved by technology

The existing technology judges whether there is sulfur poisoning based on the conversion efficiency, the calculation process is complicated, and the judgment result is inaccurate, that is, the SCR sulfur poisoning cannot be accurately judged, and there is no control strategy specifically for SCR desulfurization after the SCR sulfur poisoning is judged

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  • Control method capable of achieving SCR desulfurization regeneration
  • Control method capable of achieving SCR desulfurization regeneration
  • Control method capable of achieving SCR desulfurization regeneration

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Embodiment Construction

[0042] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.

[0043] The invention provides a control method for realizing SCR desulfurization and regeneration. It is judged whether to start the diagnosis function of SCR sulfur poisoning according to the current working condition parameters of the vehicle, SCR temperature, urea injection volume and NOx value. After starting the diagnosis function of SCR sulfur poisoning, according to the NOx Diagnosis of SCR sulfur poisoning based on emission value. When sulfur poisoning occurs in ...

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Abstract

The invention discloses a control method capable of achieving SCR desulfurization regeneration. According to a current working condition parameter, the SCR temperature, the urea injection rate and NOxvalue of a vehicle, whether a SCR sulfur poisoning diagnosis function is started or not, after the SCR sulfur poisoning diagnosis function is started, according to the NOx emission value, SCR sulfurpoisoning diagnosis is carried out, when it is diagnosed that SCR sulfur poisoning happens, a desulfurization regeneration function is started, SCR desulfurization regeneration is controlled, and after the desulfurization regeneration is finished, according to the NOx emission value, whether SCR desulfurization regeneration succeeds or not is diagnosed or not. SCR sulfur poisoning diagnosis is carried out based on the NOx emission value of a window, the diagnosis result is more accurate, SCR desulfurization regeneration control can be conveniently carried out in time, through high temperature,sulphur accumulated on SCR is removed, SCR efficiency is always kept at high efficiency, and regulatory requirements are met.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, and in particular relates to a control method for realizing SCR desulfurization regeneration. Background technique [0002] With the upcoming implementation of the National VI emission regulations, diesel engine manufacturers are currently developing National VI diesel engines. In order to reduce NOx and particulate emissions in the engine exhaust, the National VI diesel engines are matched with catalytic oxidizers (DOC) + particulate filters (DPF ) + selective redox (SCR) aftertreatment system. [0003] Regardless of whether it is a vanadium-based SCR catalyst, a Cu-based SCR catalyst or an Fe-based SCR catalyst, sulfur poisoning failures will occur, resulting in a reduction in SCR efficiency, a decrease in NOx conversion efficiency, and an increase in NOx emissions. Then the speed limit is limited and the torque is limited, which affects the driver's driving. Both fuel and lubricat...

Claims

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Application Information

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IPC IPC(8): F01N11/00F01N9/00F01N3/20
CPCF01N11/00F01N9/00F01N3/208F01N2550/02F01N2610/02F01N2900/1602F01N2900/1612F01N2900/1614Y02A50/20Y02T10/12Y02T10/40
Inventor 陈旭李卫国王必璠陈功军李智冯坦张覃亚张远程欢菅蒙
Owner DONGFENG COMML VEHICLE CO LTD
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