【摘要】：在現(xiàn)代汽車(chē)工業(yè)中,衡量汽車(chē)工業(yè)水平的標(biāo)志,除了機(jī)械結(jié)構(gòu)的改進(jìn),汽車(chē)電子化的程度被看作是另一個(gè)重要標(biāo)志,其中取代傳統(tǒng)液壓助力轉(zhuǎn)向系統(tǒng)的電動(dòng)助力轉(zhuǎn)向(EPS,Electric Power Steering)系統(tǒng),是汽車(chē)電子化在助力轉(zhuǎn)向領(lǐng)域的重要應(yīng)用,市場(chǎng)前景廣闊。根據(jù)中國(guó)汽車(chē)工業(yè)協(xié)會(huì)的報(bào)告,2007年到2012年,我國(guó)電動(dòng)助力轉(zhuǎn)向器的銷(xiāo)售額從62萬(wàn)套增加到600萬(wàn)套,市場(chǎng)占有率不斷擴(kuò)大,但本土生產(chǎn)市場(chǎng)僅占9%,其余均被外資或合資企業(yè)占領(lǐng),因此開(kāi)發(fā)出具有自主知識(shí)產(chǎn)權(quán)的EPS系統(tǒng),對(duì)我國(guó)EPS行業(yè)的發(fā)展意義非凡。本項(xiàng)目是四川省科技廳基礎(chǔ)研究項(xiàng)目,以轉(zhuǎn)向軸式EPS為研究對(duì)象,以LPC922FN單片機(jī)為控制核心,以永磁式直流電動(dòng)機(jī)為助力裝置,設(shè)計(jì)了EPS控制器,可靠性高、成本低廉。首先分析了EPS系統(tǒng)的工作原理及助力函數(shù)曲線特點(diǎn),針對(duì)傳統(tǒng)PID控制的局限,將模糊控制算法應(yīng)用到EPS中,并建立了輸入輸出參數(shù)的隸屬度函數(shù)和相應(yīng)的控制規(guī)則;然后結(jié)合轉(zhuǎn)向軸式EPS系統(tǒng)的動(dòng)力學(xué)方程,在MATLAB/SIMULINK環(huán)境下建立了系統(tǒng)模型,仿真驗(yàn)證算法的性能;硬件部分,設(shè)計(jì)確定了各主要電路的實(shí)現(xiàn)方案并完成了各功能模塊的設(shè)計(jì),軟件部分,編寫(xiě)實(shí)現(xiàn)了系統(tǒng)程序總體流程及各個(gè)軟件模塊;最后完成了系統(tǒng)軟硬件聯(lián)合調(diào)試,進(jìn)行了大量測(cè)試實(shí)驗(yàn),包括功能性實(shí)驗(yàn)和性能實(shí)驗(yàn),基本完成了設(shè)計(jì)指標(biāo),實(shí)現(xiàn)了以方向盤(pán)輸入力矩、轉(zhuǎn)向軸旋轉(zhuǎn)角度和車(chē)速為輸入信號(hào),以電機(jī)助力電流為輸出信號(hào)的助力轉(zhuǎn)向控制器的設(shè)計(jì)。本文重點(diǎn)在于將模糊控制應(yīng)用到汽車(chē)助力轉(zhuǎn)向器的開(kāi)發(fā),在安全性前提下,能夠有效的完成汽車(chē)轉(zhuǎn)向助力、阻力或回正功能,有效改善了駕駛員在低速行駛時(shí)轉(zhuǎn)向輕便與高速行駛時(shí)轉(zhuǎn)向穩(wěn)重的駕駛體驗(yàn),基本能夠達(dá)到預(yù)期的設(shè)計(jì)目標(biāo),對(duì)于實(shí)際工程有較大指導(dǎo)意義。
[Abstract]:In modern automobile industry, besides the improvement of mechanical structure, the degree of electronization of automobile is regarded as another important sign to measure the level of automobile industry. The electric power steering (EPS,Electric Power Steering) system, which replaces the traditional hydraulic power steering system, is an important application of electronic automobile in the field of power steering, and has a broad market prospect. According to the report of the China Association of Automobile Industry, from 2007 to 2012, the sales volume of electric power steering gear increased from 620000 to 6 million, and its market share continued to expand, but the local production market accounted for only 9 percent, and the rest was occupied by foreign capital or joint ventures. Therefore, the development of EPS system with independent intellectual property rights is of great significance to the development of China's EPS industry. This project is a basic research project of Sichuan Science and Technology Department. It takes steering shaft EPS as research object, LPC922FN single chip microcomputer as control core and permanent magnet DC motor as booster device. The EPS controller is designed with high reliability and low cost. Firstly, the working principle of EPS system and the characteristics of the help function curve are analyzed. Aiming at the limitation of the traditional PID control, the fuzzy control algorithm is applied to the EPS, and the membership function of the input and output parameters and the corresponding control rules are established. Then combined with the dynamic equation of the steering shaft EPS system, the system model is established under the MATLAB/SIMULINK environment, and the performance of the algorithm is verified by simulation. In the hardware part, the realization scheme of the main circuits is designed and the design of each functional module is completed. In the software part, the overall flow of the system program and each software module are realized. Finally, the joint debugging of the system software and hardware is completed, and a large number of test experiments, including functional experiment and performance experiment, are carried out, and the design index is basically completed. The design of steering controller with input torque of steering wheel, rotation angle and speed of steering shaft as input signal and motor power current as output signal is realized. The key point of this paper is to apply fuzzy control to the development of automobile power steering gear. Under the premise of safety, it can effectively accomplish the function of steering aid, resistance or realignment. It can effectively improve the driver's driving experience of light steering at low speed and steady steering at high speed, and can basically achieve the expected design goal, which is of great significance for practical engineering.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U463.4;TP273.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 葉耿,楊家軍,劉照,肖大友;汽車(chē)電動(dòng)式動(dòng)力轉(zhuǎn)向系統(tǒng)轉(zhuǎn)向路感研究[J];華中科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2002年02期

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本文編號(hào)：2279482