本文關(guān)鍵詞： 電控機械式自動變速器 離合器 起步控制 模糊控制 仿真建模　出處：《湖南大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著電子控制技術(shù)的發(fā)展,人們對車輛的智能化和自動化程度也越來越重視和依賴,提高汽車電控系統(tǒng)的性能變得尤為重要。汽車動力總成系統(tǒng)的控制效果直接影響著人們在駕駛和乘坐時獲得的動力性、舒適性和安全性等。就自動變速器而言,電控機械式自動變速器(AMT)是更加適合在我國大力發(fā)展的。而AMT在起步自動控制時,要求其既能滿足駕駛需求,又能快速并無沖擊地完成起步。因此AMT離合器的起步接合控制是關(guān)鍵,也是難點。本文簡要介紹了AMT系統(tǒng)的結(jié)構(gòu)以及該系統(tǒng)中采用直流電機驅(qū)動的自動離合器的工作原理。詳細分析了干式膜片彈簧離合器的變形特性和該離合器在工作中的轉(zhuǎn)矩傳遞特性。同時,作為電驅(qū)動的自動離合器,對其電動執(zhí)行機構(gòu)的研究必不可少。本文分析了作為電動執(zhí)行機構(gòu)的直流電機的工作原理和特性,建立了直流電機的數(shù)學(xué)模型,并對其驅(qū)動方式進行了詳細研究,作為執(zhí)行機構(gòu)控制的基礎(chǔ)。在上述內(nèi)容研究的基礎(chǔ)上,闡述了車輛的起步控制需求及工況模式,研究了離合器整個接合過程中不同階段的工作特點,并以此為基礎(chǔ)得到應(yīng)對其進行分階段的“快慢快”接合控制的結(jié)論。在智能控制方法中,模糊控制更加適用于非線性系統(tǒng)的控制,在不需要得到控制對象的精確傳遞函數(shù)的情況下就可以實現(xiàn)穩(wěn)定性較高的控制效果。本文提出了主要基于駕駛員操縱意圖的四參數(shù)模糊控制策略,分兩個層級對離合器的接合速度進行控制。為進行模糊控制策略的仿真驗證,以詳細的數(shù)學(xué)模型為基礎(chǔ),在MATLAB/Simulink軟件平臺中建立了離合器動態(tài)接合過程的仿真模型。經(jīng)過不同起步需求下的離合器接合控制仿真分析,初步驗證了以沖擊度和滑磨功評價的離合器接合控制策略的有效性。為進一步對離合器起步接合模糊控制策略進行驗證,根據(jù)離合器工作特性對其執(zhí)行機構(gòu)電機進行了選型,并同時按照AMT系統(tǒng)的控制需求,以MPC5634系列芯片為核心,設(shè)計制作了功能完整的AMT電子控制單元電路板。最后以該電控單元為硬件載體,對離合器起步接合控制策略進行了實車試驗驗證。與仿真結(jié)果對比分析得出,離合器起步接合模糊控制策略效果良好,能夠滿足不同工況下的起步需求。
[Abstract]:With the development of electronic control technology, people pay more and more attention to the degree of intelligence and automation of vehicles. It is very important to improve the performance of automobile electronic control system. The control effect of automobile power assembly system has a direct impact on the power, comfort and safety that people obtain when driving and riding. As far as automatic transmission is concerned. The electrically controlled automatic mechanical transmission (AMT) is more suitable for the development of our country, but AMT can meet the requirement of driving when it starts up with automatic control. And can complete the start quickly and without impact, so the starting joint control of the AMT clutch is the key. This paper briefly introduces the structure of the AMT system and the working principle of the automatic clutch driven by DC motor. The deformation characteristics of the dry diaphragm spring clutch and the clutch are analyzed in detail. Torque transfer characteristics at work. At the same time. As an electrically driven automatic clutch, it is necessary to study its electric actuator. In this paper, the working principle and characteristics of DC motor as an electric actuator are analyzed, and the mathematical model of DC motor is established. And the driving mode is studied in detail, as the basis of the executive control. On the basis of the above research, the starting control requirements and operating mode of the vehicle are expounded. In this paper, the working characteristics of different stages in the whole engagement process of clutch are studied, and on the basis of this, the conclusion of "fast, slow, fast" joint control is obtained. In the intelligent control method. Fuzzy control is more suitable for nonlinear systems. The stable control effect can be achieved without obtaining the accurate transfer function of the control object. In this paper, a four-parameter fuzzy control strategy is proposed, which is mainly based on the driver's control intention. The clutch engagement speed is controlled at two levels. The detailed mathematical model is used to verify the fuzzy control strategy. The simulation model of clutch dynamic engagement process is established in the MATLAB/Simulink software platform, and the simulation analysis of clutch engagement control under different starting requirements is carried out. The effectiveness of the clutch engagement control strategy evaluated by impact degree and sliding grinding power is preliminarily verified, and the fuzzy control strategy of clutch starting joint is further verified. According to the working characteristics of clutch, the motor of actuator is selected, and according to the control requirement of AMT system, MPC5634 series chip is the core. The circuit board of AMT electronic control unit with complete function is designed and fabricated. Finally, the electronic control unit is used as the hardware carrier. Compared with the simulation results, the fuzzy control strategy of clutch starting joint has a good effect and can meet the starting requirements under different working conditions.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U463.211

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