Control method for SCR efficiency recovery

A control method and efficiency technology, applied in electrical control, engine control, fuel injection control, etc., can solve the problem of unable to restore SCR efficiency, and achieve the effect of high reliability and recovery of SCR efficiency

Active Publication Date: 2019-12-31
DONGFENG COMML VEHICLE CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect and problem that the SCR efficiency cannot be recovered

Method used

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  • Control method for SCR efficiency recovery
  • Control method for SCR efficiency recovery
  • Control method for SCR efficiency recovery

Examples

Experimental program
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Embodiment

[0110] see figure 1 , figure 2 , a control method for recovering SCR efficiency, the control method comprising the following steps:

[0111] A. If the reason for the low efficiency of SCR is the low concentration of urea, replace it with normal concentration of urea;

[0112] B. If the reason for the low efficiency of SCR is that the urea injection control model has a large deviation, stop the injection of urea to make the original machine NOx react all the ammonia storage of the SCR, and the deviation between the measured value of the subsequent NOx sensor and the original machine NOx valueε= (Original NOx value - rear NOx sensor measurement value) / Original NOx value is less than the set value, and the range of the set value is 0% to 30%. It is considered that the ammonia storage in the SCR has completely reacted. At this time, The urea injection control model is restored to the initial state, the control parameters of the urea injection control model are all changed to 0,...

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Abstract

The invention discloses a control method for SCR efficiency recovery. The control method for the SCR efficiency recovery comprises the following steps that A, if the SCR efficiency is low due to low urea concentration, the normal concentration of urea is replaced; B, if the SCR efficiency is low due to the large deviation of a urea injection control model, the deviation of the urea injection control model is corrected; C, if the SCR efficiency is low due to SCR crystallization, SCR de-crystallization regeneration is started; D, if the SCR efficiency is low due to SCR sulfur poisoning, SCR desulfurization regeneration is started; and E, if the SCR efficiency is low due to a deactivated SCR catalyst, SCR is replaced. According to the control method, the SCR efficiency can be restored, and the control method is high in reliability.

Description

technical field [0001] The present invention relates to the field of selective catalytic reduction (SCR) systems of exhaust aftertreatment systems, in particular to a control method for SCR efficiency recovery, which is mainly suitable for reliably recovering SCR efficiency. Background technique [0002] With the imminent implementation of China VI emission regulations, diesel engine manufacturers are currently developing China VI diesel engines. In order to reduce NOx and particulate emissions in engine exhaust, China VI diesel engines are equipped with catalytic oxidizer (DOC) + particulate filter (DPF) ) + Selective Redox (SCR) aftertreatment system. Whether it is National IV, National V or National VI regulations, it is required to alarm when the exhaust NOx emission exceeds the legal limit. Predict the failure of SCR efficiency reduction, and carry out relevant operations to restore SCR efficiency, thereby avoiding alarms, torque limit and speed limit. [0003] Chines...

Claims

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Application Information

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IPC IPC(8): F01N3/20F02D41/38
CPCF01N3/2006F01N3/208F01N2610/02F01N2610/146F02D41/38F02D2041/389Y02T10/12
Inventor 陈旭冯坦张覃亚陈镇缪斯浩刘国平陈猛柴启寅徐傲李志明
Owner DONGFENG COMML VEHICLE CO LTD
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