【摘要】：混合動(dòng)力汽車(chē)是一種介于傳統(tǒng)燃料汽車(chē)與純電動(dòng)汽車(chē)之間的汽車(chē),兼具兩者的優(yōu)點(diǎn)。本文研究的CVT混合動(dòng)力采用多片濕式離合器取代了傳動(dòng)效率較低、結(jié)構(gòu)較復(fù)雜的液力變矩器,使得傳動(dòng)系統(tǒng)不但具有傳動(dòng)效率高、結(jié)構(gòu)簡(jiǎn)單、制造成本低、維護(hù)保養(yǎng)方便等優(yōu)點(diǎn),還同時(shí)保留了原來(lái)CVT的無(wú)級(jí)變速特性。起步控制作為CVT關(guān)鍵技術(shù)中的難點(diǎn)之一,其性能的優(yōu)劣直接關(guān)系到CVT傳動(dòng)系統(tǒng)的整體性能。發(fā)動(dòng)機(jī)起步是混合動(dòng)力汽車(chē)重要的起步方式,是必不可少的一種方式。本文對(duì)采用多片濕式離合器的CVT混合動(dòng)力汽車(chē)的發(fā)動(dòng)機(jī)起步主要開(kāi)展如下幾部分的分析與研究:(1)簡(jiǎn)述本文研究的CVT混合動(dòng)力汽車(chē)傳動(dòng)系統(tǒng)的結(jié)構(gòu)特點(diǎn)與工作原理;總結(jié)了離合器起步控制國(guó)內(nèi)外研究現(xiàn)狀。(2)簡(jiǎn)述了離合器的結(jié)構(gòu)、工作原理以及對(duì)傳動(dòng)系統(tǒng)的兩種起步裝置進(jìn)行了分析;通過(guò)分析多片濕式離合器扭矩的傳遞特性,建立了相應(yīng)的數(shù)學(xué)計(jì)算模型;分析了多片濕式離合器起步的客觀評(píng)價(jià)指標(biāo)和影響因素、起步控制策略以及接合過(guò)程,確定了以發(fā)動(dòng)機(jī)恒轉(zhuǎn)速控制策略為基礎(chǔ)的離合器控制策略。(3)通過(guò)得到的發(fā)動(dòng)機(jī)試驗(yàn)數(shù)據(jù)構(gòu)建了發(fā)動(dòng)機(jī)扭矩穩(wěn)態(tài)輸出模型,對(duì)離合器接合過(guò)程進(jìn)行了動(dòng)力學(xué)分析并構(gòu)建了傳動(dòng)系統(tǒng)的動(dòng)力學(xué)模型,確定了起步時(shí)車(chē)輛的阻力矩;根據(jù)發(fā)動(dòng)機(jī)恒轉(zhuǎn)速起步控制機(jī)理,分析制定了發(fā)動(dòng)機(jī)目標(biāo)轉(zhuǎn)速、目標(biāo)發(fā)動(dòng)機(jī)扭矩、離合器油壓變化率、離合器傳遞扭矩達(dá)到目標(biāo)值所需時(shí)間等主要控制數(shù)表。(4)簡(jiǎn)述了發(fā)動(dòng)機(jī)恒轉(zhuǎn)速控制策略中常采用的節(jié)氣門(mén)分段線(xiàn)性控制和模糊控制方法,并在Matlab/Simulink中構(gòu)建相應(yīng)的模型進(jìn)行仿真分析;針對(duì)這兩種控制方法存在的問(wèn)題,提出根據(jù)發(fā)動(dòng)機(jī)需求扭矩,采用PID方法對(duì)節(jié)氣門(mén)進(jìn)行控制,通過(guò)建立相應(yīng)Simulink模型得到的結(jié)果,表明此方法的控制性能更佳。(5)總結(jié)了發(fā)動(dòng)機(jī)恒轉(zhuǎn)速起步控制策略中出現(xiàn)的問(wèn)題;采用BP神經(jīng)網(wǎng)絡(luò)對(duì)目標(biāo)油門(mén)踏板開(kāi)度進(jìn)行預(yù)估,建立相應(yīng)的仿真模型,并對(duì)比分析了預(yù)估前后仿真結(jié)果;提出利用模糊理論建立駕駛員的起步意圖模型,并以此對(duì)發(fā)動(dòng)機(jī)恒轉(zhuǎn)速控制中發(fā)動(dòng)機(jī)目標(biāo)轉(zhuǎn)速和離合器液壓缸油壓變化率兩個(gè)控制參數(shù)進(jìn)行修正,通過(guò)建立的仿真模型得到的仿真結(jié)果,表明此方法可以很好的體現(xiàn)駕駛員的起步意圖同時(shí)實(shí)現(xiàn)實(shí)際條件下的發(fā)動(dòng)機(jī)恒轉(zhuǎn)速起步。
[Abstract]:Hybrid electric vehicle (HEV) is a kind of vehicle between traditional fuel vehicle and pure electric vehicle, which has the advantages of both. The CVT hybrid power system studied in this paper uses multi-disc wet clutch to replace the hydraulic torque converter with low transmission efficiency and complicated structure, which makes the transmission system have not only high transmission efficiency, simple structure, but also low manufacturing cost. Convenient maintenance and other advantages, but also retain the original CVT stepless speed characteristics. Starting control is one of the key technologies in CVT. Its performance is directly related to the overall performance of CVT transmission system. Engine starting is an important way of starting hybrid electric vehicle, is an indispensable way. In this paper, the engine start of CVT hybrid electric vehicle with multi-disc wet clutch is analyzed and studied as follows: (1) the structural characteristics and working principle of the CVT hybrid electric vehicle drive system studied in this paper are briefly described. The research status of clutch starting control at home and abroad is summarized. (2) the structure and working principle of clutch and two starting devices of transmission system are analyzed, and the transmission characteristics of torque of multi-disc wet clutch are analyzed. The corresponding mathematical calculation model is established, and the objective evaluation index and influencing factors of multi-disc wet clutch starting, starting control strategy and joint process are analyzed. The clutch control strategy based on engine constant speed control strategy is determined. (3) the steady output model of engine torque is constructed through the obtained engine test data. The dynamic analysis of clutch engagement process and the construction of dynamic model of transmission system are carried out, and the resistance moment of vehicle is determined when starting, and the engine target speed is analyzed according to the starting control mechanism of engine constant speed. The main control tables such as target engine torque, clutch oil pressure change rate, and the time required for clutch transmission torque to reach the target value are presented. (4) the throttle piecewise linear control and fuzzy control methods commonly used in engine constant speed control strategy are briefly described. According to the problems existing in these two control methods, the throttle is controlled by PID method according to the torque of engine demand, and the results obtained by establishing the corresponding Simulink model are obtained. It shows that the control performance of this method is better. (5) the problems in engine starting control strategy of constant speed are summarized, and the target throttle pedal opening degree is estimated by BP neural network, and the corresponding simulation model is established. The simulation results before and after the prediction are compared and analyzed, and the fuzzy theory is used to establish the starting intention model of the driver. The two control parameters of engine target speed and clutch hydraulic cylinder pressure change rate in constant engine speed control are modified, and the simulation results are obtained by the established simulation model. It shows that this method can well reflect the driver's starting intention and realize the engine constant speed starting under the actual conditions.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：U469.7

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 尹燕莉;鄧濤;秦松濤;潘小亮;丁建明;趙雙;;基于分段線(xiàn)性控制策略的回流式無(wú)級(jí)變速器起步仿真研究[J];機(jī)械傳動(dòng);2014年05期

2 賈燕紅;王浩;張銳;王藝穎;房宏威;;新能源汽車(chē)的發(fā)展現(xiàn)狀與前景的研究[J];汽車(chē)實(shí)用技術(shù);2014年03期

3 秦大同;陳清洪;;基于最優(yōu)控制的AMT/DCT離合器通用起步控制[J];機(jī)械工程學(xué)報(bào);2011年12期

4 孫冬野;陳然;秦大同;劉振軍;;AMT汽車(chē)起步過(guò)程節(jié)氣門(mén)目標(biāo)控制量的確定[J];汽車(chē)工程;2009年11期

5 彭建鑫;金輝;陳慧巖;;基于最優(yōu)化理論的離合器接合曲線(xiàn)研究[J];北京理工大學(xué)學(xué)報(bào);2009年11期

6 謝先平;王旭東;吳曉剛;余騰偉;;自動(dòng)離合器位置跟蹤神經(jīng)元自適應(yīng)PID控制[J];電機(jī)與控制學(xué)報(bào);2008年05期

7 李萍;曾令可;稅安澤;金雪莉;劉艷春;王慧;;基于MATLAB的BP神經(jīng)網(wǎng)絡(luò)預(yù)測(cè)系統(tǒng)的設(shè)計(jì)[J];計(jì)算機(jī)應(yīng)用與軟件;2008年04期

8 孫冬野,秦大同;汽車(chē)離合器局部恒轉(zhuǎn)速起步自動(dòng)控制研究[J];機(jī)械工程學(xué)報(bào);2003年11期

9 何忠波,陳慧巖,席軍強(qiáng),汪e，

本文編號(hào)：2144235