本文關(guān)鍵詞：油液特性對液壓機械無級傳動換段性能的影響研究　出處：《燕山大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 液壓機械 無級傳動 油液特性 換段過程 仿真

【摘要】：液壓機械無級傳動綜合了機械傳動效率高和液壓傳動無級變速的優(yōu)點，是重型車輛較理想的傳動形式。換段過程控制是提高液壓機械無級傳動性能的關(guān)鍵問題，換段過程中液壓傳動單元負(fù)載扭矩反向，閉式液壓回路高低壓邊互換，引起馬達(dá)轉(zhuǎn)速突變，造成動力瞬時中斷、系統(tǒng)速比波動，，并伴隨振動和噪聲，油液性能與液壓機械無級傳動換段動態(tài)特性密切相關(guān)。 本文開展了液壓機械無級傳動換段過程建模、動態(tài)特性及其影響因素仿真分析，換段控制等研究，獲得油液特性對換段過程性能的影響規(guī)律。主要研究內(nèi)容包括：(1)分析了液壓機械無級傳動換段過程的速度特性、扭矩特性、功率流以及換段過程動態(tài)特性的影響因素，指出油液特性、負(fù)載扭矩、換段時機與換段動態(tài)特性密切相關(guān)；(2)建立了液壓機械無級傳動換段過程數(shù)學(xué)模型及仿真模型，包括變排量液壓元件模型、定排量液壓元件模型、負(fù)載模型和油液模型等，應(yīng)用MATLAB/Simulink進行了仿真分析，仿真結(jié)果表明液壓油含氣量越大，油液體積彈性模量越小，換段時定排量液壓元件轉(zhuǎn)速波動越大，換段品質(zhì)降低；(3)分析了負(fù)載變化對系統(tǒng)換段動態(tài)特性的影響規(guī)律，指出前段離合器分離與后段離合器結(jié)合重疊負(fù)載控制策略能有效降低定排量液壓元件的轉(zhuǎn)速波動；開展了換段過程控制策略研究，提出調(diào)節(jié)變排量液壓元件排量比控制方法，有效降低了定排量液壓元件轉(zhuǎn)速波動。
[Abstract]:Hydraulic machinery stepless transmission combines the advantages of high efficiency of mechanical transmission and continuously variable speed of hydraulic transmission and is the ideal transmission form of heavy vehicle. The key problem of improving the performance of hydraulic machinery stepless transmission is to change the stage process control. In the process of changing section, the load torque of hydraulic transmission unit is reverse, the high and low pressure side of closed hydraulic circuit is interchangeable, which causes the sudden change of motor speed, the instantaneous interruption of power, the fluctuation of system speed ratio, and the accompanying vibration and noise. The oil performance is closely related to the dynamic characteristics of hydraulic machinery stepless transmission. In this paper, the modeling of hydraulic machinery stepless transmission stage changing process, dynamic characteristics and its influencing factors simulation analysis, section changing control and other research are carried out. The main research contents include: (1) the speed characteristic and torque characteristic of hydraulic machinery stepless transmission are analyzed. The influence factors of the power flow and the dynamic characteristics of the switching process are pointed out. The oil performance, load torque and timing are closely related to the dynamic characteristics of the changing stage. The mathematical model and simulation model of hydraulic machinery stepless transmission are established, including variable displacement hydraulic element model, constant displacement hydraulic element model, load model and oil fluid model, etc. The simulation results with MATLAB/Simulink show that the larger the gas content of hydraulic oil, the smaller the bulk elastic modulus of oil, and the greater the fluctuation of rotational speed of hydraulic components with constant displacement. The quality of changing segment was decreased; The influence of load change on the dynamic characteristics of the system is analyzed. It is pointed out that the combination of front clutch separation and rear clutch overlapping load control strategy can effectively reduce the speed fluctuation of constant displacement hydraulic components. The control strategy of changing stage process is studied, and the method of regulating the displacement ratio of variable displacement hydraulic components is put forward, which effectively reduces the fluctuation of rotational speed of constant displacement hydraulic components.
【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH137

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