隨著世界范圍內(nèi)環(huán)保與節(jié)能意識的增強,研究與開發(fā)清潔燃料汽

1、隨著世界范圍內(nèi)環(huán)保與節(jié)能意識的增強，研究與開發(fā)“清潔燃料”汽車成為當今重要的課題。本論文以躍進汽車集團實際科研項目為依托，研究新一代燃氣發(fā)動機電控系統(tǒng)機理及設(shè)計方法，。對于合理利用能源，降低排放污染，實現(xiàn)汽車的高效、節(jié)能和環(huán)保具有重要的理論意義和工程應(yīng)用價值。 本論文取得的研究成果主要有： 1對燃油發(fā)動機燃料系統(tǒng)進行改建，以LPG代替汽油進行工作。在匹配蒸發(fā)調(diào)壓器、混合器、節(jié)氣門閥體等燃氣裝置的基礎(chǔ)上，增加了氧傳感器、轉(zhuǎn)速傳感器、溫度傳感器、進氣歧管壓力傳感器、節(jié)氣門位置傳感器、燃氣流量調(diào)節(jié)閥、廢氣再循環(huán)閥等器件，。完成了LPG燃料電控系統(tǒng)的軟件和硬件設(shè)計，系統(tǒng)結(jié)構(gòu)合理，功能齊備，可靠性好、應(yīng)

2、用機型廣。 2研究與開發(fā)了空燃比控制系統(tǒng)，采用開環(huán)與閉環(huán)相結(jié)合的控制策略：燃氣發(fā)動機在起動、怠速、大負荷、全負荷工況時處于開環(huán)控制模式，?？刂破魍ㄟ^對燃氣供給量的調(diào)整，保證發(fā)動機獲得最佳性能；在部分負荷時，采用基于混合靈敏度設(shè)計方法的空燃比閉環(huán)控制器，將空燃比精確控制在理論值附近，在環(huán)境、溫度發(fā)生變化和長期使用的情況下，仍能保證控制系統(tǒng)具有良好的性能。 3開發(fā)了帶冷卻裝置和線性EGR電磁閥的廢氣再循環(huán)控制系統(tǒng)，通過大量實驗獲取了發(fā)動機各種工況下的最佳廢氣再循環(huán)開度MAP，。在保證燃氣發(fā)動機動力性能及經(jīng)濟性能的情況下，最大程度地降低了NOx排放量。采用遞推最小二乘算法(RLS),并以EGR位置傳

3、感器信號為反饋，對MAP進行在線優(yōu)化，使在磨損、電壓波動等誤差存在的情況下，仍能保持廢氣再循環(huán)的控制效果。 4研究點火提前角與LPG發(fā)動機性能和排放的關(guān)系,。 獲取各種工況下LPG發(fā)動機的最佳點火提前角,實現(xiàn)了基于RBF神經(jīng)網(wǎng)絡(luò)的點火系統(tǒng)優(yōu)化，提高了發(fā)動機的性能。 5為了提高LPG汽車的性能，對提高發(fā)動機的壓縮比進行了研究，并完成了總功率對比試驗和負荷特性試驗。對單燃料LPG汽車NJ6400GHR2的整車排放性能，整車動力性能進行了試驗研究。采用電控系統(tǒng)后，整車的排放指標優(yōu)于歐洲號排放法規(guī)的要求。 本論文的研究成果已通過江蘇省科學(xué)技術(shù)成果鑒定（蘇科鑒字2002第1114號），并已投入使用。Wi

4、th the increasing consciousness for awareness of the environmental protection and energy conservation throughout the whole world, nowadays the research and development of automobile by using clean alternative fuel become becomes an important subject. Based on the practical research project given by

5、of YueJin Auto Group, research on mechanism and electronic control system for gaseous automotive engine of new generation has been done is studied in this dissertation. Research works in this dissertation have It has important theory meaning and application engineering value for effective energy uti

6、lization, exhaust contamination reduction, energy conservation and environmental protection. The main research fruits in this dissertation show below as follow: 1. The fuel system of gasoline engine is converted. This engine runs well by using LPG as fuel instead of gasoline. Based on Beside matchin

7、g work of gasifier, mixer and air throttle valve, many devices such as exhaust gas oxygen sensor, engine speed sensor, temperature sensor, intake manifold pressure sensor, air throttle position sensor, flow regulator valve and exhaust gas recirculation valve are were added. Software and hardware des

8、igns(是可數(shù)名詞嗎) of gaseous fuel electronic control system are implemented. This control system which has many merits such as appropriate structure, integrated function, high reliability and extensive utility. 2. Air-fuel-ratio control system is researched and developed. In this system, the strategy com

9、bined with open loop control and closed loop control is adopted: During Under some specific driving modes such as cold start, idle speed, heavy load and full load condition, the control system works as open loop. Through regulating the gaseous fuel supply, the controller can help the engine acquire

10、optimum performance; Under the circumstance of part load, Based on the design method of hybrid sensitivity, During part load condition, air-fuel-ratio can be keeped at the stoichiometric value by closed loop controller which the design method of hybrid sensitivity was applied in. When the circumstan

11、ce environment and temperature change or the engine aged after long-time running, the good performance of controller can be preserved. 3. Including A control system with inter cooler and linear EGR solenoid, exhaust gas recirculation control system is developed in this dissertation. Through a large

12、number of experiments, the optimum EGR valve opening MAP is acquired during under various operating modes. The fuel consumptions consumption and engine performance can meet the challenge. At the same time, NOx emissions are reduced to minimum. Using RLS algorithm and the feedback of EGR valve positi

13、on sensor, the on-line optimization of EGR MAP is fulfilled. even when When the condition of abrasion and voltage pulsation occurs, the control effect of EGR is also maintained sustained. 4. The relationship of ignition angle, LPG engine performance and emissions is studied.; At various Various work

14、 conditions optimum ignition angles are acquired. and Because of the implementation of optimum ignition system based on RBF neural network is added, so LPG engine performance is greatly improved. 5. In order to improve the performance of LPG automobile, how to appropriately increase compression rati

15、o is researched. At last, total-power contrast test, load characteristics test, emission test and running test of NJ6400GHR2 LPG automobile have been done. After adopting this electronic control system, the emission results meet the emission regulation of European . Research fruits in this dissertat

16、ion not only have passed the appraisement of Jiangsu provincial scientific and technical production （No. 2002 1114）but also and systems have been practically applied. 1. 意義相近的詞組選擇不當；2. 定冠詞用法錯誤；3. 可數(shù)名詞與不可數(shù)名詞用法區(qū)分；4. 時態(tài)錯誤；5. 重復(fù)文章內(nèi)容，可利用代詞；6. 中國式英語非常嚴重；7. 標點符號錯誤；8. 連詞使用單一；9. 介詞使用錯誤；My Respectful Professor Guo:How are you!Last Friday you assigned the homework that let us search three dissertations abstract and select one of them to check error. I do it. After checked the dissertation, I was surprised that so many mistakes in this abstract that I doubt mysel