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Method for estimating ammonia coverage and inlet ammonia gas concentration of diesel engine SCR system

A technology of SCR system and ammonia gas concentration, which is applied to mechanical equipment, exhaust devices, engine components, etc., and can solve the problems of complex structure, high price and high cost of measuring devices

Inactive Publication Date: 2019-09-06
BEIHANG UNIV
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Problems solved by technology

In order to realize the closed-loop control of urea injection, the ammonia coverage on the surface of the SCR catalyst is an extremely important parameter. However, there is currently no commercial physical sensor that can directly collect the ammonia coverage.
In addition, the measurement of the intake ammonia concentration parameters entering the SCR system is also very important. Currently, physical sensors are used for measurement, and the physical sensors used are usually expensive and costly. Some physical sensors will also lead to a more complicated structure of the measuring device

Method used

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  • Method for estimating ammonia coverage and inlet ammonia gas concentration of diesel engine SCR system
  • Method for estimating ammonia coverage and inlet ammonia gas concentration of diesel engine SCR system
  • Method for estimating ammonia coverage and inlet ammonia gas concentration of diesel engine SCR system

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Embodiment Construction

[0095] Such as Figure 1-11 As shown, figure 1 It is a schematic diagram of the chemical reaction inside the SCR system;

[0096] figure 2 It is a schematic diagram of the actual value of the intake ammonia concentration model;

[0097] image 3 It is a schematic diagram of the estimated value of intake ammonia concentration based on SRUTF;

[0098] Figure 4 It is a schematic diagram of the estimated intake ammonia concentration based on PF;

[0099] Figure 5 It is a schematic diagram of the absolute estimation error between the estimated value of the intake ammonia concentration based on SRUCF and the true value of the model;

[0100] Image 6 It is a comparison chart of the absolute estimation error between the estimated value of intake ammonia concentration based on SRUCF and the true value of the model, and the absolute estimation error between the estimated value of intake ammonia concentration based on PF and the true value of the model;

[0101] Figure 7 It is a schematic di...

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Abstract

The invention discloses a method for estimating ammonia coverage and inlet ammonia gas concentration of a diesel engine SCR system. Firstly, a three-order state spatial model of the SCR is establishedaccording to an inner chemical reaction mechanism of the SCR system. Secondly, according to the established system model, the ammonia coverage and the inlet ammonia gas concentration in the SCR system are estimated by means of an SRUKF algorithm. Based on the SRUKF algorithm, through acquiring the Sigma point, traceless deformation is used for processing nonlinear transmission of a mean value anda covariance. No linear neglecting of high-order items is realized, and high estimating precision of the algorithm is obtained. Accuracy in estimating the ammonia coverage and the inlet ammonia gas concentration can be improved. Furthermore a problem of incapability of acquiring the ammonia coverage by means of a physical sensor is settled, and urea injection closed-loop control of the SCR is facilitated. The method can accurately estimate the inlet ammonia gas concentration in the SCR system, thereby reducing use of ammonia gas concentration sensors and reducing use cost.

Description

Technical field [0001] The invention relates to the technical field of automobile exhaust emission, in particular to a method for estimating the ammonia coverage of a diesel engine SCR system and the concentration of intake ammonia. Background technique [0002] Compared with gasoline engines, diesel has relatively higher NOx content in its exhaust due to different combustion mechanisms. NOx can cause acid rain and photochemical smog, and also cause human respiratory diseases, threatening the natural environment and human health. Therefore, many countries in the world have established strict regulations on the NOx emissions of diesel engines. [0003] In order to reduce the NOx content in exhaust emissions, many technologies have been applied to diesel engine aftertreatment systems. Among them, SCR technology is considered to be the most promising exhaust gas aftertreatment technology, which can effectively convert NOx in exhaust gas into N2 and H 2 O. The SCR system sprays a cer...

Claims

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Application Information

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IPC IPC(8): G16C20/10G16C10/00F01N3/20
CPCF01N3/2066G16C10/00G16C20/10Y02A50/20Y02T10/12
Inventor 杨世春冯松陈飞张正杰刘健
Owner BEIHANG UNIV
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