本文選題：液壓機械無級變速器 + 發(fā)動機特性��； 參考：《河南科技大學(xué)》2015年碩士論文

【摘要】：大功率高性能輪式拖拉機的需求不斷增加,人們對其動力性、燃油經(jīng)濟性和操作舒適性的要求越來越高。液壓機械無級變速器(HMCVT)能夠?qū)崿F(xiàn)高效率、大功率的傳動。發(fā)動機和HMCVT作為拖拉機的核心部件,其性能直接影響著拖拉機的性能,同時發(fā)動機與HMCVT的匹配也影響著整車的性能。所以對發(fā)動機和變速器控制的研究對提高整車性能有著重要的意義。本文首先建立了發(fā)動機的數(shù)學(xué)模型,發(fā)動機模型清楚地表達了發(fā)動機的性能。分析了發(fā)動機的特性曲線,得出了發(fā)動機的動力性能指標(biāo)和經(jīng)濟性能指標(biāo)隨轉(zhuǎn)速變化的規(guī)律,以及發(fā)動機的最佳經(jīng)濟性和最佳動力性工作曲線。以400馬力輪式拖拉機HMCVT為研究對象,分析了多段HMCVT的速比特性、轉(zhuǎn)矩特性、功率分流特性及效率特性,進一步研究了HMCVT傳動拖拉機的牽引特性分析計算原理和表達方法,根據(jù)HMCVT速比變化特點,對發(fā)動機和變速器進行匹配,得出了在發(fā)動機的最佳經(jīng)濟性和最佳動力性的情況下,HMCVT經(jīng)濟性和動力性目標(biāo)段位對應(yīng)的目標(biāo)速比。分析了變速器自動變速控制系統(tǒng)的控制原理以及液壓控制單元各部件的功能,確定了電子控制系統(tǒng)的組成部分,針對該控制系統(tǒng)設(shè)計了基于TMS320F2812數(shù)字信號處理系統(tǒng)的硬件電路,主要設(shè)計了DSP的最小系統(tǒng),信號的輸入輸出模塊以及通訊模塊等硬件電路。確定了軟件控制模塊的控制算法,采用matlab建立了泵-馬達的控制系統(tǒng)模型,仿真證明了模糊PID控制比普通PID控制的優(yōu)越性。針對自動變速控制功能的部分程序進行了設(shè)計,最后驗證了控制系統(tǒng)的可行性。
[Abstract]:With the increasing demand of high power and high performance wheeled tractors, the demand for power, fuel economy and operating comfort is becoming higher and higher. Hydraulic mechanical stepless transmission (HMCVT) can achieve high efficiency and high power transmission. As the core component of tractor, engine and HMCVT have a direct impact on the performance of tractor, and the matching between engine and HMCVT also affects the performance of the whole vehicle. Therefore, the study of engine and transmission control is of great significance to improve the vehicle performance. In this paper, the mathematical model of the engine is established, and the performance of the engine is clearly expressed by the engine model. The characteristic curve of engine is analyzed, and the variation law of engine dynamic performance index and economic performance index with rotating speed, as well as the optimum economy and power performance curve of engine are obtained. Taking HMCVT of 400hp wheeled tractor as the research object, the speed ratio characteristic, torque characteristic, power shunt characteristic and efficiency characteristic of multi-segment HMCVT are analyzed, and the principle and expression method of traction characteristic analysis and calculation of HMCVT tractor are further studied. According to the changing characteristics of HMCVT speed ratio, the target speed ratio of engine and transmission is obtained under the condition of the best economy and the best power performance of the engine, and the target speed ratio corresponding to the economic and dynamic target segments of the engine is obtained. This paper analyzes the control principle of transmission automatic speed change control system and the function of each component of hydraulic control unit, determines the component of electronic control system, and designs the hardware circuit based on TMS320F2812 digital signal processing system for the control system. The minimum system of DSP, the input and output module of signal and the communication module are designed. The control algorithm of the software control module is determined and the control system model of the pump motor is established by using matlab. The simulation results show that the fuzzy PID control is superior to the ordinary PID control. Finally, the feasibility of the control system is verified.
【學(xué)位授予單位】：河南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：S219;TH137

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相關(guān)期刊論文 前2條

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2 ;Research and Design of Hydro-mechanical Continuously Variable Transmission for Tractors[J];Journal of Northeast Agricultural University(English Edition);2006年02期

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本文編號：1902972