【摘要】：金屬帶式無級變速器(CVT)因其結(jié)構(gòu)簡單、成本低廉、使用壽命長以及容易實現(xiàn)動力傳動系的綜合控制,能夠充分地發(fā)揮發(fā)動機的特性,更好地提高汽車的燃油經(jīng)濟性、動力性、駕駛舒適性及行駛平順性,所以一直是備受推崇的變速箱產(chǎn)品種類。然而,目前的無級變速器均采用液壓系統(tǒng)對錐盤加壓實現(xiàn)變速控制,在該產(chǎn)品的生產(chǎn)使用實踐中,存在著三個主要問題：(1)液壓系統(tǒng)的高能耗；(2)液壓系統(tǒng)的高成本；(3)液壓系統(tǒng)的低可靠性。本文所研究的是一種新近開發(fā)的具有自主完全知識產(chǎn)權(quán)的機械電子式無級變速器(Electronic Mechnical Continuously Variable Transmission),這種新型的無級變速器拋開了高能耗的泵、閥、液力變矩器,用能耗低的電機、齒輪、碟形彈簧加壓對EMCVT調(diào)速。本課題來源遼寧省科學(xué)技術(shù)計劃工業(yè)攻關(guān)重點項目資助,項目編號：2009220015,該項目名稱是“車用無級變速器實驗與控制關(guān)鍵技術(shù)攻關(guān)”。 本文的主要工作是： 通過現(xiàn)場試驗充分了解EMCVT的調(diào)速機構(gòu),對其進(jìn)行受力分析,研究影響調(diào)速負(fù)載的各種因素,建立調(diào)速負(fù)載的數(shù)學(xué)模型； 利用有限元軟件Ansys分析調(diào)速機構(gòu)的核心元件-—碟形彈簧的力學(xué)特性,并分析不同轉(zhuǎn)速條件下對碟形彈簧力學(xué)特性的影響； 建立調(diào)速負(fù)載simulink的仿真模型,得出其特性曲線,定量或定性地分析不同因素對調(diào)速負(fù)載的影響程度,為以后的控制策略、方法的研制提供一些理論指導(dǎo)； 提出調(diào)速負(fù)載的優(yōu)化模型,并利用復(fù)合型法對其優(yōu)化,得出優(yōu)化后碟形彈簧的參數(shù)以及優(yōu)化結(jié)果； 提出新的CVT的速比變化率與汽車加速度的關(guān)系表達(dá)式和研究它們關(guān)系的分析方法,在現(xiàn)有研究的基礎(chǔ)上提出一個關(guān)于汽車加速度與速比變化率之間關(guān)系的猜想,并且建立了EMCVT下速比變化率的數(shù)學(xué)模型,求解了該EMCVT的各個時刻的速比變化率。 通過本文工作得出了如下重要結(jié)論：在所選定的有效工作范圍內(nèi),變速箱轉(zhuǎn)速對碟形彈簧的力學(xué)性能影響很小,可以不做考慮；求解的調(diào)速負(fù)載的特性曲線不是很合理,由此提出調(diào)速負(fù)載的優(yōu)化模型,優(yōu)化結(jié)果對比以前調(diào)速性能有比較明顯的優(yōu)化作用,同時該優(yōu)化思想可以應(yīng)用到EMCVT的結(jié)構(gòu)設(shè)計上；本文提出新的CVT的速比變化率與汽車加速度的關(guān)系表達(dá)式更簡潔更合理有利于分析它們之間的關(guān)系。所提出的關(guān)于車加速度與速比變化率之間關(guān)系的猜想以及求解的EMCVT的速比變化率,為EMCVT控制策略中的速比控制實踐提供一定的理論支持。
[Abstract]:Because of its simple structure, low cost, long service life and easy to realize the comprehensive control of power transmission system, metal belt continuously variable transmission (CVT) can give full play to the characteristics of engine and improve the fuel economy of automobile. Power, driving comfort and ride comfort, so it has always been a highly respected gearbox product category. However, the hydraulic system is used to control the conical disk pressure in the current stepless transmission. There are three main problems in the production and application of the product: (1) the high energy consumption of the hydraulic system, (2) the high cost of the hydraulic system, and (2) the high cost of the hydraulic system. (3) the low reliability of hydraulic system. In this paper, a newly developed mechanical electronic continuously variable transmission (Electronic Mechnical Continuously Variable Transmission),) with independent and complete intellectual property rights is studied, which puts aside the high energy consumption pump, valve and hydraulic torque converter. Use low energy consumption motor, gear, disc spring pressure to speed the EMCVT speed. This project comes from Liaoning Province Science and Technology Plan Industrial key Project support, project number: 2009220015, the project name is "vehicle continuously variable Transmission experiment and Control key Technology Research". The main work of this paper is: through the field test to fully understand the speed regulation mechanism of EMCVT, to carry on the force analysis to it, to study the various factors that affect the speed regulation load, and to establish the mathematical model of the speed regulation load; The mechanical properties of disc spring, which is the core element of speed regulation mechanism, are analyzed by using finite element software Ansys, and the influence of different rotating speed on the mechanical properties of disc spring is analyzed. The simulation model of speed regulation load simulink is established, its characteristic curve is obtained, and the influence degree of different factors on speed regulation load is analyzed quantitatively or qualitatively, which provides some theoretical guidance for the development of control strategy and method in the future. The optimization model of speed regulating load is put forward, and the parameters and optimization results of the optimized disc spring are obtained by using the compound method. A new expression of the relationship between the speed ratio change rate of CVT and the automobile acceleration is put forward and the analysis method of their relationship is studied. on the basis of the existing research, a conjecture about the relationship between the speed ratio change rate and the speed ratio change rate is put forward. The mathematical model of the downspeed ratio change rate of EMCVT is established, and the speed ratio change rate of the EMCVT at each time is solved. Through the work of this paper, the following important conclusions are drawn: in the selected effective working range, the speed of the gearbox has little effect on the mechanical properties of the disc spring, which can be ignored; The characteristic curve of the speed regulation load is not very reasonable, so the optimization model of the speed regulation load is put forward, and the optimization results have obvious optimization effect compared with the previous speed regulation performance. At the same time, the optimization idea can be applied to the structural design of EMCVT. In this paper, it is proposed that the new expression of the relationship between the speed ratio of CVT and the acceleration of automobile is more concise and reasonable, which is beneficial to the analysis of the relationship between them. The conjecture about the relationship between vehicle acceleration and speed ratio change rate and the speed ratio change rate of solved EMCVT provide some theoretical support for the practice of speed ratio control in EMCVT control strategy.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH132.46

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 楊虹;閥門用碟形彈簧的計算[J];閥門;2003年04期

2 易先中;張傳友;嚴(yán)澤生;;碟形彈簧的力學(xué)特性參數(shù)研究[J];長江大學(xué)學(xué)報(自科版)理工卷;2007年04期

3 史艷紅;史艷冰;;碟形彈簧的測試[J];起重運輸機械;2008年09期

4 郝小波;劉訓(xùn)志;周家勇;;某碟形彈簧疲勞失效分析[J];技術(shù)與市場;2011年07期

5 張輝;王永;姚丁元;;某型特種車用碟形彈簧道路試驗故障研究[J];汽車實用技術(shù);2012年04期

6 ，

本文編號：2491610