四电机独立驱动工程机械控制系统研究

发布时间：2019-04-02 14:57

【摘要】：推土机作为工程机械行业一个比较重要的机种,在国家的基础建设方面起到了越来越重要的作用。推土机工作时环境恶劣,并且在作用过程中负载波动很大,而传统的推土机多为机械或液力驱动,因此,往往造成在这些场合下推土机的工作效率低、排放量大等很多缺点。随着电传动技术的不断发展和节能环保意识的提高,越来越多的推土机开始使用这种新型的能量传递方式,以取代高排放、高污染的传统推土机。从节能减排角度出发,本文主要针对四轮独立驱动的电传动推土机的控制系统问题进行研究,目的是通过制定一系列的控制策略来实现推土机的节能。首先,论文从推土机的整个控制系统展开,分别对其中的发动机冷却系统制定了智能风扇控制策略以及对驱动系统制定了能量回馈控制策略,同时,针对其中的驱动系统,还制定了直驶时四轮同步控制策略和转向时电子差速控制策略,其次,对驱动系统进行重点分析,为了实现其能量回馈,采用了一种新型的四象限变频调速系统,再次,课题围绕四象限变频调速系统展开,为了实现能量回馈这一目标,分别针对该系统的前端整流部分和后端逆变部分的控制系统分别进行了控制策略的制定、模型建立和分析,最后,通过Matlab/Simulink软件,对整个采用了四象限变频调速系统的四轮独立驱动系统进行了仿真分析,最终得到本课题研究的结论。主要包括三个方面,一是电传动推土机中的驱动系统中采用四象限变频调速系统时,将PMSM作为驱动电机来使用,可以满足推土机在作业时的不同工况,二是验证了所设计的能量回馈策略的正确性,采用四象限变频调速系统时可以实现电传动推土机的能量回馈,三是将四象限变频调速系统与四轮驱动结合起来时,验证所采用的四轮同步控制策略可以很好地实现推土机四轮的同步。
[Abstract]:Bulldozer, as an important machine type in construction machinery industry, plays a more and more important role in the national infrastructure construction. The working environment of bulldozer is very bad, and the load fluctuates greatly in the process of action, but the traditional bulldozer is driven by mechanical or hydraulic force. Therefore, the bulldozer has many disadvantages such as low working efficiency and large emission under these circumstances. With the development of electric transmission technology and the improvement of the consciousness of energy saving and environmental protection, more and more bulldozers begin to use this new energy transfer method to replace the traditional bulldozers with high emission and high pollution. From the point of view of energy saving and emission reduction, this paper mainly focuses on the control system of four-wheel independent drive bulldozer, in order to make a series of control strategies to realize the energy-saving of bulldozer. Firstly, from the whole control system of bulldozer, intelligent fan control strategy for engine cooling system and energy feedback control strategy for driving system are formulated, and at the same time, aiming at the driving system of the bulldozer, an intelligent fan control strategy is made for the engine cooling system and an energy feedback control strategy for the driving system. The synchronous control strategy of four wheels and the electronic differential speed control strategy of steering time are also formulated. Secondly, the driving system is analyzed emphatically. In order to realize its energy feedback, a new type of four quadrant variable frequency speed regulation system is adopted, and again, In order to realize the goal of energy feedback, the control strategy of the front-end rectifier part and the back-end inverter part of the control system are formulated, and the model is established and analyzed, respectively, in order to realize the goal of energy feedback, the control strategy of the four-quadrant variable frequency speed regulation system is developed. Finally, through the Matlab/Simulink software, the four-wheel independent drive system with four quadrant variable frequency speed control system is simulated and analyzed. Finally, the conclusion of this paper is obtained. It mainly includes three aspects: first, when the four quadrant variable frequency speed regulation system is used in the drive system of the electric drive bulldozer, the PMSM can be used as the driving motor, which can satisfy the different working conditions of the bulldozer in operation. Second, the correctness of the designed energy feedback strategy is verified. The energy feedback of the bulldozer can be realized when the four quadrant variable frequency speed regulation system is used, and the four quadrant variable frequency speed regulation system is combined with the four wheel drive. Verify that the four-wheel synchronization control strategy can achieve the four-wheel synchronization of bulldozer.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU603

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