本文關鍵詞：液壓機械無級變速器的段內控制策略研究　出處：《吉林大學》2011年碩士論文　論文類型：學位論文

  更多相關文章： HMCVT 功率循環(huán) 效率 鍵合圖 控制仿真

【摘要】：工程車輛具有工況復雜,作業(yè)對象多變等特點,經常在變載荷情況下工作。這不僅要求車輛具有較高可靠性和適應能力,同時也大大增加了操作難度。另外,隨著能源危機、環(huán)境污染等問題日益嚴重,工程機械行業(yè)也面臨著嚴峻的節(jié)能減排義務和責任。因此,實現無級變速對于提高工程車輛的動力性和經濟性、減輕駕駛員勞動強度都有重要的意義。 液壓機械無級變速器(Hydro-Mechanical Continuously Variable Transmission,簡稱HMCVT)液壓機械無級傳動綜合了液壓傳動的無級、柔性的特點和機械傳動效率高的特點,在大功率拖拉機、工程車輛、坦克等許多領域有著良好的應用前景。 本文對液壓機械無級變速器的原理組成進行了分析,研究了液壓機械無級變速器的速度特性、轉矩特性、效率特性,為效率的分析和仿真模型的建立打下理論基礎。文章采用解析法和鍵合圖動態(tài)分析法對HMCVT的輸入、輸出功率和液壓系統傳遞的功率的大小和方向進行了分析,證明HMCVT在每一段中都存在功率循環(huán),并分別用兩種方法對液壓系統的效率和HMCVT的效率進行了分析,相互驗證。 對等比式液壓機械無級變速器與ZL50裝載機的匹配性進行了驗證,分析了車輛的動力性。建立了發(fā)動機的穩(wěn)態(tài)和動態(tài)數學模型。并根據以上分析,制定出以發(fā)動機最佳動力性和液壓機械無級變速器工作在高效區(qū)為控制目標的段內控制策略。 應用MATIAB/M-File、MATIAB/Simulink和RecurDyn動力學仿真模型建立ZL50裝載機的整車仿真模型,其中包括發(fā)動機模型、HMCVT模型、控制器、車輛和負載模塊等。使用仿真模型進行控制仿真,證實了該控制方法可以使發(fā)動機穩(wěn)定在目標工作點,且使HMCVT工作在高效區(qū),達到了控制目的。
[Abstract]:The engineering vehicle has the characteristics of complex working condition , changeable operation object and the like , and is often operated under the condition of variable load , which not only requires the vehicle to have higher reliability and adaptability , but also greatly increases the operation difficulty . Hydro - mechanical stepless transmission ( HMCVT ) hydraulic mechanical stepless transmission integrates the stepless , flexible characteristics of hydraulic transmission and the high efficiency of mechanical transmission , and has good application prospect in many fields , such as high - power tractor , engineering vehicle , tank and so on . In this paper , the principle components of hydraulic machinery stepless speed changer are analyzed , the speed characteristic , torque characteristic and efficiency characteristic of hydraulic machinery stepless speed changer are analyzed , and the theoretical foundation is laid for the analysis of efficiency and the establishment of simulation model . The analysis of the input , output power and power transmitted by hydraulic system is carried out by means of analytical method and bond graph dynamic analysis method . The efficiency of the hydraulic system and the efficiency of the HMCVT are analyzed by two methods , and the efficiency of the hydraulic system and the efficiency of the HMCVT are analyzed . The matching between equal - ratio hydraulic mechanical stepless speed changer and ZL50 loader is verified , and the dynamic characteristics of the vehicle are analyzed . The steady state and dynamic mathematical models of the engine are established . According to the above analysis , the control strategy for controlling the optimal power of the engine and the continuously variable transmission of the hydraulic machinery in the high - efficiency zone as the control target is worked out . The simulation model of ZL50 loader is established by using the simulation model of the dynamic simulation model , which includes the engine model , the HMCVT model , the controller , the vehicle , the load module , etc . The simulation model is used to control the simulation , and the control method can be used to stabilize the engine at the target working point , and the HMCVT can be operated in the high - efficiency area , and the control purpose is achieved .

【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH132.46

【引證文獻】

相關碩士學位論文 前3條

1 張旭燕;油液特性對液壓機械無級傳動換段性能的影響研究[D];燕山大學;2012年

2 賀會超;液壓機械無級變速技術在玉米收獲機中的應用研究[D];吉林大學;2013年

3 古存;液壓機械復合無級傳動控制器研制[D];燕山大學;2013年

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本文編號：1399194