SCR inlet temperature management method and system

A management method and inlet temperature technology, applied in the direction of exhaust gas treatment, electrical control of exhaust gas treatment devices, mechanical equipment, etc., can solve the problems of wasting fuel and affecting the conversion efficiency of SCRNox, and achieve good improvement effect and robustness of results Good, simple and reliable algorithm

Active Publication Date: 2022-03-08
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]Aiming at the defects existing in the prior art, the object of the present invention is to provide a method and system for managing the temperature of the SCR inlet, which can solve the problems in the prior art directly according to the temperature of the SCR inlet. Temperature or engine exhaust temperature is the judgment basis for turning on / off SCR heating, which leads to too late turning on and off of SCR heating, causing the SCR inlet temperature to drop too low and SCR heating for too long, affecting the Nox conversion efficiency of SCR and wasting fuel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0057] A1: The first control factor is determined according to the temperature at the entrance of the DOC, and the second control factor is determined according to the temperature at the entrance of the DPF.

[0058] In this example, after the first control factor and the second control factor are calibrated and tabulated through the realization of the test, the temperature T 1 and the temperature T at the inlet of the DPF 2 Obtained by fuzzing.

[0059] A2: According to the first control factor and the second control factor, determine the correction coefficient of the temperature at the inlet of the SCR.

[0060] In this embodiment, according to the formula β=η*α 1 +(1-η)*α 2 , to determine the correction coefficient β of the temperature at the entrance of the SCR; among them, η is a weighting coefficient, which is also calibrated and adjusted according to the test results, and the value range is between 0 and 1. In this example, the value of η is 0.5, and α 1 is the firs...

Embodiment approach A

[0079] Embodiment A: When the predicted temperature at the SCR inlet is greater than or equal to the set temperature, the SCR heating is not turned on. When the predicted temperature at the inlet of the SCR is lower than the set temperature, the SCR heating is turned on.

Embodiment approach B

[0080] Embodiment B: If Embodiment C is adopted in S1, it can be directly judged whether to turn on the SCR heating according to the correction coefficient β. When β is greater than or equal to the set value, SCR heating is not turned on; when β is less than the set value, SCR heating is turned on. The setting value can be calibrated, and the value range is the same as that of β, which is 0~2, and the calibration is 1 in this example. At this time, the correction coefficient β itself can represent the level of the predicted temperature of the SCR inlet, and can be used in S3 to replace the predicted temperature value of the SCR inlet.

[0081] When the SCR heating is turned on, reduce the opening of the engine intake throttle valve or the exhaust gas throttle valve, increase the main fuel injection quantity of the engine, push back the engine timing, turn on the far rear injection, and turn on the second Seven nozzles open fuel injection, adjust VGT opening and / or adjust EGR ...

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Abstract

The invention relates to the technical field of engine aftertreatment control, in particular to an SCR inlet temperature management method and system. The method comprises the following steps that the predicted temperature of an SCR inlet is determined according to the temperatures of DOC, DPF and SCR inlets; and according to the SCR inlet predicted temperature, the SCR heating degree is adjusted or whether SCR heating is started or not is judged. The system comprises an analysis and correction module and a judgment and execution module, and the analysis and correction module is used for correcting the temperature of an SCR inlet according to the temperatures of DOC, DPF and SCR inlets and determining the predicted temperature of the SCR inlet; and the judgment execution module is used for judging whether to start SCR heating or not according to the SCR inlet predicted temperature. The problems that in the prior art, the SCR inlet temperature or the engine exhaust temperature is directly used as the judgment basis for starting / stopping SCR heating, so that the SCR heating is started or stopped too late, the SCR inlet temperature is reduced to be too low or the SCR heating is too long, the Nox conversion efficiency of the SCR is affected, and fuel oil is wasted are solved.

Description

technical field [0001] The invention relates to the technical field of engine aftertreatment control, in particular to a method and system for managing the temperature of an SCR inlet. Background technique [0002] Technical measures to purify automobile exhaust and reduce the impact of pollution. Including internal and external purification of the engine. The former is to burn part of the exhaust gas again to reduce harmful substances in the exhaust gas; the latter is to install an exhaust catalytic converter, and the exhaust gas such as carbon monoxide, hydrocarbons and nitrogen oxides discharged from the internal combustion engine is converted into carbon dioxide and nitrogen through the catalytic converter. and water. [0003] Diesel engine post-treatment SCR (Selective Catalytic Reduction) is the main device used to treat exhaust NOx (nitrogen oxides) emissions. Its conversion efficiency of NOx at low temperature is extremely low, and it is easy to cause urea to be us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/28F01N9/00
CPCF01N3/2006F01N3/2066F01N3/208F01N3/28F01N9/00F01N2610/02F01N2610/10F01N2570/14Y02T10/12Y02T10/40Y02A50/20
Inventor 李林程欢郑攀白桃李周坤诚王梅俊刘杰周杰敏陈玉俊
Owner DONGFENG COMML VEHICLE CO LTD
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