本文選題：空燃比　切入點：點火提前角　出處：《合肥工業(yè)大學(xué)》2015年碩士論文

【摘要】：作為一種新型的清潔能源,天然氣已經(jīng)在各個行業(yè)被廣泛使用,尤其是汽車行業(yè)。天然氣發(fā)動機類型主要有兩種,即單燃料天然氣發(fā)動機和兩用燃料天然氣發(fā)動機。隨著現(xiàn)代控制技術(shù)的發(fā)展,發(fā)動機的空燃比和排放等控制需求也越來越嚴(yán)格,因此,開發(fā)具有市場競爭力的CNG發(fā)動機電子控制單元成為了當(dāng)前的一大熱點�！� 面對越來越復(fù)雜的電控單元系統(tǒng),傳統(tǒng)的ECU開發(fā)方式存在著周期長,成本高,壓力大的缺點,尤其對于高度復(fù)雜的、非線性的發(fā)動機控制單元設(shè)計而言,不論是軟件開發(fā)還是測試都變得愈加困難。 本文使用MATLAB/Simulink軟件與dSPACE系統(tǒng)的RTI模塊相結(jié)合,建立單燃料CNG發(fā)動機快速控制原型,以模塊框圖化的形式實現(xiàn)了CNG發(fā)動機的控制算法設(shè)計。主要設(shè)計了： 針對天然氣發(fā)動機空燃比控制的,基于寬域氧傳感器的閉環(huán)和自學(xué)習(xí)控制策略；基于轉(zhuǎn)速反饋的點火提前角自動標(biāo)定系統(tǒng)；CNG發(fā)動機恒轉(zhuǎn)控制算法；針對不同負(fù)荷下轉(zhuǎn)速與節(jié)氣門的關(guān)系進(jìn)行了傳遞函數(shù)的辨識,并且進(jìn)行了反饋PID仿真控制研究。 在對博世LSU4.2寬域氧傳感器工作原理分析的基礎(chǔ)上,設(shè)計的基于寬域氧反饋的空燃比PID閉環(huán)和自學(xué)習(xí)控制策略,實現(xiàn)對空燃比的有效控制,并且?guī)椭鷩姎釳AP的標(biāo)定,標(biāo)定者不需要對每一個工況點進(jìn)行非常精確的標(biāo)定,在發(fā)動機工作時依靠閉環(huán)和自學(xué)習(xí)就可以將噴氣脈寬調(diào)整到合適的值,節(jié)省噴氣MAP標(biāo)定時間,同時也可以彌補發(fā)動機磨損老化造成的空燃比偏移；基于轉(zhuǎn)速反饋的點火提前角標(biāo)定系統(tǒng)可以幫助點火MAP的標(biāo)定；發(fā)動機恒轉(zhuǎn)控制系統(tǒng)是為擴大控制系統(tǒng)的適用性,采用PID控制策略通過實時調(diào)整節(jié)氣門開度使轉(zhuǎn)速始終穩(wěn)定在設(shè)定目標(biāo)值附近；基于模型的節(jié)氣門和轉(zhuǎn)速反饋PID控制仿真研究是預(yù)先辨識出不同負(fù)荷下的轉(zhuǎn)速與節(jié)氣門的傳遞函數(shù),然后建立反饋PID控制模型,這樣就可以方便的進(jìn)行PID參數(shù)的整定。
[Abstract]:As a new type of clean energy, natural gas has been widely used in various industries, especially in automobile industry. There are two main types of natural gas engines. With the development of modern control technology, the control requirements such as air-fuel ratio and emissions are becoming more and more stringent. Developing Electronic Control Unit of CNG engine with Market Competitiveness has become a Hot spot at present. In the face of more and more complex electronic control unit (ECU) system, the traditional ECU development method has the disadvantages of long period, high cost and high pressure, especially for the highly complex, nonlinear engine control unit design. Both software development and testing are becoming increasingly difficult. In this paper, the rapid control prototype of single-fuel CNG engine is established by combining MATLAB/Simulink software with RTI module of dSPACE system, and the control algorithm of CNG engine is realized in the form of block diagram. For the air-fuel ratio control of natural gas engine, the closed-loop and self-learning control strategy based on wide range oxygen sensor, the automatic calibration system of ignition advance angle based on speed feedback, and the constant rotation control algorithm of CNG engine are proposed. The transfer function is identified for the relationship between rotational speed and throttle under different loads, and the feedback PID simulation control is studied. On the basis of analyzing the working principle of Bosch LSU4.2 wide range oxygen sensor, the closed loop and self learning control strategy of air fuel ratio (PID) based on wide domain oxygen feedback is designed to realize the effective control of air fuel ratio and help the calibration of jet MAP. The calibrator does not need to calibrate each operating point very accurately. The jet pulse width can be adjusted to a suitable value by means of closed-loop and self-learning while the engine is working, thus saving the calibration time of the jet MAP. At the same time, it can make up the air-fuel ratio offset caused by the aging of engine wear; the calibration system of ignition advance angle based on speed feedback can help the calibration of ignition MAP; the engine constant rotation control system is to expand the applicability of the control system. The PID control strategy is used to adjust the throttle opening in real time so that the rotational speed is always stable near the set target value. The simulation research of throttle and speed feedback PID control based on the model is to identify the transfer function of speed and throttle under different loads in advance, and then establish the feedback PID control model, so that the parameters of PID can be adjusted conveniently.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TK402

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王珂,張幽彤;天然氣發(fā)動機技術(shù)發(fā)展研究[J];車輛與動力技術(shù);2000年04期

2 劉利,卓斌;PID控制在電控汽油機λ閉環(huán)控制中的應(yīng)用及相關(guān)參數(shù)的標(biāo)定[J];車用發(fā)動機;2000年01期

3 孟長江;馬安麗;賈利;范燕朝;付海燕;張維彪;;快速控制原型在柴油機電控單元開發(fā)中的應(yīng)用[J];車用發(fā)動機;2008年05期

4 王欣;張紅光;姚寶峰;韓雪嬌;田小飛;王道靜;;小負(fù)荷時天然氣發(fā)動機點火提前角對排放影響的試驗研究[J];車用發(fā)動機;2010年03期

5 王琳,馬平;系統(tǒng)辨識方法綜述[J];電力情報;2001年04期

6 沈承;沈銳;盧剛;;一種柴油發(fā)電機模糊PID調(diào)速控制方法[J];機械與電子;2011年10期

7 孟嗣宗,郭少平,張文海;發(fā)動機精確空燃比控制方法的研究[J];內(nèi)燃機工程;1999年02期

8 杭勇,劉學(xué)瑜;利用代碼自動生成技術(shù)實現(xiàn)柴油機電控系統(tǒng)控制算法的開發(fā)[J];內(nèi)燃機工程;2005年02期

9 吳義虎;汽油機最佳點火正時轉(zhuǎn)速自適應(yīng)檢測系統(tǒng)的研究[J];內(nèi)燃機學(xué)報;1996年03期

10 吳義虎;汽油機點火正時微處理機自適應(yīng)控制系統(tǒng)的研究[J];汽車工程;1991年01期

相關(guān)博士學(xué)位論文 前1條

1 彭雪飛;CNG單燃料多點噴射發(fā)動機電控系統(tǒng)開發(fā)及性能研究[D];吉林大學(xué);2008年

，

本文編號：1679647