本文選題：車輪滑動率 + 液壓制動系統(tǒng)　； 參考：《吉林大學》2016年碩士論文

【摘要】：車輛動力學控制作為汽車技術(shù)發(fā)展的一個重要方向,一直是科研人員研究的熱點,ABS/TCS/ESP等車輛動力學控制系統(tǒng)在實車中已經(jīng)獲得廣泛應(yīng)用。實現(xiàn)這些控制系統(tǒng)的途徑多是對輪胎力的控制。汽車輪胎力的主要影響因素是路面的附著系數(shù)、車輪的垂直載荷、車輪的滑動率和車輪的側(cè)偏角,而在其中滑動率是能直接、精確控制的,因而,滑動率的控制對車輛動力學控制來說至關(guān)重要。車輛動力學控制系統(tǒng)通過控制滑動率來調(diào)節(jié)輪胎力,而滑動率的調(diào)節(jié)又離不開對制動系統(tǒng)輪缸壓力的控制,所以可以通過對車輪施加制動力矩實現(xiàn)對滑動率的控制從而調(diào)節(jié)輪胎力達到理想值,使汽車獲得理想的動力學性能。然而,由于汽車制動系統(tǒng)特別是液壓執(zhí)行器具有很強的非線性特性,對滑動率的調(diào)節(jié)非常困難。若能在動力學控制中考慮制動系統(tǒng)執(zhí)行機構(gòu)的特性,對輪缸壓力實現(xiàn)精細調(diào)節(jié)和有效估計,則能精確控制滑動率,進一步提高汽車的底盤動力學性能。本文的研究工作包括以下幾個部分:(1)分析制動系統(tǒng)的結(jié)構(gòu)原理,采用功率鍵合圖理論,建立包含制動主缸、制動管路、制動鉗以及車輪在內(nèi)的液壓制動系統(tǒng)模型。并由此列寫出描述液壓制動系統(tǒng)的狀態(tài)方程。(2)搭建液壓制動系統(tǒng)測試平臺,獲得制動系統(tǒng)的實驗數(shù)據(jù),采用最小二乘法和遺傳算法,對液壓制動系統(tǒng)鍵合圖模型的參數(shù)進行識別。(3)在AMESim中建立制動系統(tǒng)單輪模型,將此模型得到的制動輪缸壓力、電磁閥流量曲線與由在MATLAB中建立的鍵合圖模型得到的輪缸壓力曲線和電磁閥流量曲線進行對比,進一步驗證鍵合圖模型的正確性。(4)采用滑模變結(jié)構(gòu)控制算法設(shè)計了基于制動執(zhí)行機構(gòu)特性的滑動率控制器,并基于MATLAB/AMESim聯(lián)合仿真平臺進行了離線仿真驗證。
[Abstract]:As an important direction in the development of automotive technology, vehicle dynamics control system has been widely used in real vehicles, such as ABS / TCS / ESP and other vehicle dynamics control systems. The way to realize these control systems is to control the tire force. The main factors influencing the tire force are the road adhesion coefficient, the vertical load of the wheel, the slip rate of the wheel and the side angle of the wheel, in which the slip rate can be directly and accurately controlled. The control of slip rate is very important for vehicle dynamics control. The vehicle dynamics control system adjusts the tire force by controlling the slip rate, and the sliding rate can not be adjusted without the control of the wheel cylinder pressure of the braking system. Therefore, the braking torque can be applied to the wheel to control the slip rate to adjust the tire force to reach the ideal value, so that the vehicle can obtain the ideal dynamic performance. However, it is very difficult to adjust the slip rate due to the strong nonlinear characteristics of the brake system, especially the hydraulic actuator. If the characteristics of the actuator of the braking system can be considered in the dynamic control and the cylinder pressure can be accurately adjusted and effectively estimated, the sliding rate can be accurately controlled and the dynamic performance of the chassis can be further improved. The research work of this paper includes the following parts: 1) analyzing the structure principle of the brake system, using the power bond graph theory, establishing the hydraulic brake system model including the main brake cylinder, the brake pipe, the brake clamp and the wheel. The test platform of hydraulic braking system is built, the experimental data of braking system are obtained, and the least square method and genetic algorithm are used. The parameters of bond graph model of hydraulic brake system are identified. 3) the single wheel model of brake system is established in AMESim, and the pressure of brake wheel cylinder is obtained by this model. The flow curve of solenoid valve is compared with the pressure curve of cylinder and the flow curve of solenoid valve obtained from bond graph model established in MATLAB. Furthermore, the correctness of bond graph model is verified. (4) the sliding rate controller based on the characteristics of brake actuator is designed by using sliding mode variable structure control algorithm, and the off-line simulation is carried out based on MATLAB / AMESim joint simulation platform.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U463.5

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本文編號：1997133