通用型SCR系統(tǒng)的自學(xué)習(xí)控制及適用性評價
發(fā)布時間：2018-08-03 18:38
【摘要】：在傳統(tǒng)往復(fù)活塞式內(nèi)燃機中,相對于汽油機而言,由于柴油機當(dāng)量壓縮比大,所以在經(jīng)濟性、動力性以及排放性中的降低溫室氣體排放方面優(yōu)勢顯著,因此,柴油機不僅站穩(wěn)了商用車的主流市場,而且在乘用車市場份額也在增長。然而,柴油機具有氮氧化物和顆粒排放高的缺點,而且兩者是一種trade-off的關(guān)系,因選擇性催化還原后處理系統(tǒng)在降低氮氧化物(NOx)排放方面具有很大的優(yōu)勢,因此成為眾多商家滿足日益嚴(yán)格排放法規(guī)的首選技術(shù)手段。然而,由于歷史原因,柴油機電子控制系統(tǒng)、還原劑噴射系統(tǒng)大量借鑒和引入國外產(chǎn)品,對整機控制算法、信號協(xié)議、核心硬件自主開發(fā)不足,造成產(chǎn)品構(gòu)架、控制策略、信號模式均采用了國外的開發(fā)模式,一個系統(tǒng)一個標(biāo)準(zhǔn),無統(tǒng)一性。而本文是在吉林大學(xué)韓汛峰通用型SCR系統(tǒng)自學(xué)習(xí)控制策略和算法研究的基礎(chǔ)上,利用實驗室資源對其控制策略和算法進行了優(yōu)化、改善,并進行了開發(fā)性的研究和控制策略功能的實現(xiàn),引入了閉環(huán)控制的PID調(diào)節(jié),為通用型SCR系統(tǒng)進一步研究和實現(xiàn)產(chǎn)品化提供了研究思路和基礎(chǔ)。本文首先詳細(xì)介紹了后處理SCR系統(tǒng)的化學(xué)反應(yīng)機理,并把發(fā)動機排氣中的氮氧化物所有可能發(fā)生的反應(yīng)用化學(xué)方程式量化,為通用型SCR系統(tǒng)的設(shè)計提供了重要的參考依據(jù),基于SCR系統(tǒng)對尾氣中氮氧化物的反應(yīng)的化學(xué)方程式的量化分析,重新設(shè)計了通用型SCR系統(tǒng)的儲液罐、補液罐、恒壓罐,保證了通用型SCR系統(tǒng)應(yīng)用到實際中的可行性及實用性。詳細(xì)介紹了新的硬件設(shè)備的結(jié)構(gòu)以及工作原理,根據(jù)新硬件設(shè)備的工作原理開發(fā)相應(yīng)的軟件控制程序,實現(xiàn)了對尿素自動供給系統(tǒng)電磁閥和尿素噴嘴的控制,并實時的進行信號的反饋和顯示。使得控制得到量化,保證控制的穩(wěn)定性與準(zhǔn)確性。利用飛思卡爾單片機MC9S12XS128開發(fā)板以及相應(yīng)的開發(fā)軟件Codewarrior,實現(xiàn)了液位、溫度、氮氧化物的信號數(shù)據(jù)的采集以及控制,制定了補液和恒壓噴射電磁閥以及噴嘴的控制策略。編寫了尿素噴嘴的噴射程序,并在此程序下研究了新一代博世噴嘴在不同噴射壓力和噴射頻率下的噴射特性,為下面的研究提供了參考依據(jù)。通過試驗,可以生成氮氧化物的總生成量脈譜和催化轉(zhuǎn)化效率脈譜,繪制了通用型SCR系統(tǒng)的氨氮比脈譜以及還原噴射量脈譜,為確定噴嘴的控制策略奠定了依據(jù)。根據(jù)PID算法制定了實現(xiàn)尾氣中氮氧化物自調(diào)節(jié)控制的策略,并進行了B50工況進行試驗,進行了該控制系統(tǒng)PID參數(shù)的整定。利用LabVIEW軟件實現(xiàn)了通用型SCR系統(tǒng)計算機軟件的開發(fā),進行了LabVIEW與下位機電控單元的通訊試驗,驗證了該軟件通訊功能可行性,使得更直觀監(jiān)測實驗數(shù)據(jù)。
[Abstract]:In the traditional reciprocating piston internal combustion engine, compared with the gasoline engine, because of the large equivalent compression ratio of the diesel engine, the advantages of reducing greenhouse gas emissions in economy, power performance and emission are significant. Diesel engines have not only secured the mainstream market of commercial vehicles, but also increased their market share in passenger vehicles. However, diesel engine has the disadvantage of high NOx and particle emission, and the relationship between them is a kind of trade-off, because the selective catalytic reduction post-treatment system has great advantages in reducing NOx (NOx) emissions. Therefore, it has become the preferred technical means for many businesses to meet the increasingly stringent emission regulations. However, due to historical reasons, the electronic control system of diesel engine and the reducing agent injection system have been widely used for reference and introduced into foreign products. The lack of independent development of the control algorithm, signal protocol and core hardware of the whole engine has resulted in the product structure and control strategy. The signal mode adopts the foreign development mode, one system and one standard, no unity. Based on the study of self-learning control strategy and algorithm of Hanxunfeng SCR system in Jilin University, this paper optimizes and improves the control strategy and algorithm by using laboratory resources. The development research and the realization of the control strategy function are carried out, and the PID regulation of the closed-loop control is introduced, which provides the research idea and foundation for the further research and realization of the general-purpose SCR system. In this paper, the chemical reaction mechanism of reprocessing SCR system is introduced in detail, and all possible reactions of NOx in engine exhaust are quantified by chemical equation, which provides an important reference for the design of general SCR system. Based on the quantitative analysis of the chemical equation of the reaction of nitrogen oxides in tail gas by SCR system, the storage tank, rehydration tank and constant pressure tank of the general SCR system are redesigned, which ensures the feasibility and practicability of the universal SCR system applied in practice. The structure and working principle of the new hardware equipment are introduced in detail. According to the working principle of the new hardware equipment, the corresponding software control program is developed, and the control of the solenoid valve and the urea nozzle in the urea automatic supply system is realized. And real-time signal feedback and display. The control is quantified to ensure the stability and accuracy of the control. The signal data acquisition and control of liquid level, temperature and nitrogen oxide are realized by using Freescale single chip computer MC9S12XS128 development board and the corresponding development software Codewarrior. The control strategy of rehydration and constant pressure injection solenoid valve and nozzle is established. The injection program of urea nozzle was compiled, and the injection characteristics of the new generation Bosch nozzle under different injection pressure and injection frequency were studied under this program, which provides a reference for the following research. The total output pulse spectrum and catalytic conversion efficiency pulse spectrum of nitrogen oxides can be generated by experiments. The ammonia nitrogen specific pulse spectrum and reduction jet pulse spectrum of the universal SCR system are plotted, which lays a foundation for determining the control strategy of the nozzles. According to the PID algorithm, the strategy to realize the control of nitrogen oxides in exhaust gas is established, and the B50 test is carried out, and the PID parameters of the control system are adjusted. The computer software of general SCR system is developed by using LabVIEW software. The communication experiment between LabVIEW and the lower computer electronic control unit is carried out. The feasibility of the communication function of the software is verified, which makes it more intuitive to monitor the experimental data.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TK423
本文編號：2162652
[Abstract]:In the traditional reciprocating piston internal combustion engine, compared with the gasoline engine, because of the large equivalent compression ratio of the diesel engine, the advantages of reducing greenhouse gas emissions in economy, power performance and emission are significant. Diesel engines have not only secured the mainstream market of commercial vehicles, but also increased their market share in passenger vehicles. However, diesel engine has the disadvantage of high NOx and particle emission, and the relationship between them is a kind of trade-off, because the selective catalytic reduction post-treatment system has great advantages in reducing NOx (NOx) emissions. Therefore, it has become the preferred technical means for many businesses to meet the increasingly stringent emission regulations. However, due to historical reasons, the electronic control system of diesel engine and the reducing agent injection system have been widely used for reference and introduced into foreign products. The lack of independent development of the control algorithm, signal protocol and core hardware of the whole engine has resulted in the product structure and control strategy. The signal mode adopts the foreign development mode, one system and one standard, no unity. Based on the study of self-learning control strategy and algorithm of Hanxunfeng SCR system in Jilin University, this paper optimizes and improves the control strategy and algorithm by using laboratory resources. The development research and the realization of the control strategy function are carried out, and the PID regulation of the closed-loop control is introduced, which provides the research idea and foundation for the further research and realization of the general-purpose SCR system. In this paper, the chemical reaction mechanism of reprocessing SCR system is introduced in detail, and all possible reactions of NOx in engine exhaust are quantified by chemical equation, which provides an important reference for the design of general SCR system. Based on the quantitative analysis of the chemical equation of the reaction of nitrogen oxides in tail gas by SCR system, the storage tank, rehydration tank and constant pressure tank of the general SCR system are redesigned, which ensures the feasibility and practicability of the universal SCR system applied in practice. The structure and working principle of the new hardware equipment are introduced in detail. According to the working principle of the new hardware equipment, the corresponding software control program is developed, and the control of the solenoid valve and the urea nozzle in the urea automatic supply system is realized. And real-time signal feedback and display. The control is quantified to ensure the stability and accuracy of the control. The signal data acquisition and control of liquid level, temperature and nitrogen oxide are realized by using Freescale single chip computer MC9S12XS128 development board and the corresponding development software Codewarrior. The control strategy of rehydration and constant pressure injection solenoid valve and nozzle is established. The injection program of urea nozzle was compiled, and the injection characteristics of the new generation Bosch nozzle under different injection pressure and injection frequency were studied under this program, which provides a reference for the following research. The total output pulse spectrum and catalytic conversion efficiency pulse spectrum of nitrogen oxides can be generated by experiments. The ammonia nitrogen specific pulse spectrum and reduction jet pulse spectrum of the universal SCR system are plotted, which lays a foundation for determining the control strategy of the nozzles. According to the PID algorithm, the strategy to realize the control of nitrogen oxides in exhaust gas is established, and the B50 test is carried out, and the PID parameters of the control system are adjusted. The computer software of general SCR system is developed by using LabVIEW software. The communication experiment between LabVIEW and the lower computer electronic control unit is carried out. The feasibility of the communication function of the software is verified, which makes it more intuitive to monitor the experimental data.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TK423
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