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Control method for reducing crystallization risk in scr urea injection system

The technology of a urea injection system and a control method is applied in the control field of reducing the crystallization risk of the SCR urea injection system, and can solve problems such as the wall attachment effect of the urea injection system, so as to improve reliability, reduce the risk of freezing cracks, prolong purging or The effect of suck time

Active Publication Date: 2019-04-26
WEICHAI POWER CO LTD +1
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  • Abstract
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Problems solved by technology

[0010] The purpose of the present invention is to effectively solve the problem of the Coanda effect caused by the injection of urea solution in the urea injection system, which is achieved by the following technical solutions

Method used

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  • Control method for reducing crystallization risk in scr urea injection system
  • Control method for reducing crystallization risk in scr urea injection system
  • Control method for reducing crystallization risk in scr urea injection system

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no. 1 approach

[0043] Such as figure 1 As shown, in the first embodiment of the present invention, a control method for reducing the crystallization risk of the SCR urea injection system is provided, and the control method includes the following steps:

[0044] S1: When the SCR urea injection system (for example, an air-assisted SCR urea injection system) changes from the injection state of injecting urea to the purging state of purging the urea solution existing in the pipeline (for example, through the SCR urea injection system) The electronic control unit judges that the SCR urea injection system changes from the injection state of injecting urea to the purging state of purging the urea solution existing in the pipeline, or, through the electronic control unit of the SCR urea injection system, the SCR urea injection system is switched from injecting urea to After the spraying state is transferred to the purging state of purging the urea solution existing in the pipeline), the air valve of...

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Abstract

The invention provides a control method for reducing the crystallization risk of an SCR urea injection system. According to the control method, after a urea pump is discharged and carries out continuous blowing or inverse suction for a certain period of time, the urea pump is stopped for a period of time, blowing or inverse suction continues to be carried out for a certain period of time after local liquid convergence, and intermittent blowing or inverse suction is carried out. Compared with the operation that blowing or inverse suction time is prolonged blindly, residual urea can be blown away or inversely sucked more thoroughly by means of the control strategy, and therefore the reliability of the SCR urea injection system is improved.

Description

technical field [0001] The present invention relates to engine exhaust (such as exhaust gas) catalytic reduction technology, in particular, to a control method for reducing the crystallization risk of an SCR urea injection system. Background technique [0002] In order to meet the increasingly stringent emission regulations, the improvement of the engine combustion process and the application of various optimization strategies are the limit to meet the national IV emission requirements. For this reason, the research and development of various exhaust after-treatment devices has sprung up. Engine purification technology includes pre-treatment technology and post-treatment technology. The pre-treatment technology reduces the generation of pollutants in the combustion process of the engine cylinder by changing the intake air and fuel quality, and the post-treatment technology reduces the final pollutants emitted by the engine by treating the pollutants already generated in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/208F01N9/00F01N2610/02F01N2610/1486Y02T10/12Y02T10/40
Inventor 安丽花李国朋张建华王飞郑志强
Owner WEICHAI POWER CO LTD
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