【摘要】：重型礦用自卸車是一類用于礦山短途運輸?shù)姆枪奋囕v,其工作環(huán)境惡劣,承載質(zhì)量大且空、滿載交替變換。在重型礦用自卸車上采用自動變速技術可減輕駕駛員勞動強度、提高車輛工作效率。目前在該類車上采用的換擋策略多數(shù)都是引用非專用車自動變速理論,并未考慮礦用自卸車特殊的工作環(huán)境,由此制定的換擋策略不免出現(xiàn)動力不足或循環(huán)換擋等問題。本文針對礦用自卸車使用環(huán)境和工作特點,在非專用車輛兩參數(shù)自動換擋策略的基礎上,引入了一個新的參數(shù)——車輛負荷系數(shù)來綜合表征車輛載荷和道路狀況,最終提出了以“車速、油門開度、車輛負荷系數(shù)”為控制參數(shù)的三參數(shù)動態(tài)自動換擋策略。本文以32噸礦用自卸車為研究對象,首先建立了包括發(fā)動機、液力變矩器等部分的車輛傳動系統(tǒng)的數(shù)學模型,重點研究了發(fā)動機與液力變矩器的共同工作情況,求解了二者共同工作的輸出特性。然后,通過解析法和圖解法對最佳換檔車速進行了求解,并最終得到了動力性動態(tài)換擋策略的換擋曲線。在MATLAB/SIMULINK仿真環(huán)境下建立了整個車輛傳動系統(tǒng)的仿真模型,針對本文制定的換擋策略進行了多工況復合仿真試驗。試驗結(jié)果表明,本文制定的換擋策略可適應車輛運行的惡劣環(huán)境和多種復雜工況,能保證車輛在各種工況下的動力性,并可減少車輛自動擋位模式的設置。在某工廠提供的設備環(huán)境下搭建了試驗平臺并進行了試驗,提出了針對本文自動換擋試驗的試驗臺改進方案,并設計了試驗控制軟件和自動換擋的程序。
[Abstract]:Heavy mine dump truck is a kind of non-road vehicle used in mine short distance transportation. Its working environment is bad, the bearing quality is large and empty, and the full load is alternately changed. The automatic transmission technology in heavy mine dump truck can reduce the labor intensity of drivers and improve the working efficiency of vehicles. At present, most of the shift strategies used in this kind of vehicles are based on the theory of automatic transmission of non-special vehicles, and the special working environment of mine dump trucks is not taken into account. The shift strategy therefore has some problems, such as insufficient power or cyclic shift, and so on. In this paper, according to the working environment and working characteristics of mining dump truck, a new parameter, vehicle load coefficient, is introduced to comprehensively characterize the vehicle load and road condition on the basis of the two-parameter automatic shift strategy of non-special vehicle. Finally, a three-parameter dynamic automatic shift strategy based on "speed, throttle opening and vehicle load coefficient" is proposed. In this paper, the 32 ton mine dump truck is taken as the research object. Firstly, the mathematical model of the vehicle transmission system, including the engine, the hydraulic torque converter and so on, is established, and the common work of the engine and the hydraulic torque converter is studied. The output characteristics of the two working together are solved. Then, the optimal shift speed is solved by analytical method and graphic method, and the shift curve of dynamic shift strategy is finally obtained. The simulation model of the whole vehicle transmission system is established in MATLAB/SIMULINK simulation environment, and the multi-working condition compound simulation test is carried out according to the shift strategy developed in this paper. The test results show that the shift strategy formulated in this paper can adapt to the bad environment of the vehicle and a variety of complex working conditions, can ensure the dynamic performance of the vehicle under various working conditions, and can reduce the setting of the automatic blocking mode of the vehicle. The test platform is built and tested in the equipment environment provided by a factory, and the improvement scheme of the test-bed for the automatic shift test is put forward, and the test control software and the automatic shift program are designed.
【學位授予單位】：燕山大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD562.1

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本文編號：2478177