基于CAN總線的拖拉機自動導(dǎo)航系統(tǒng)轉(zhuǎn)向控制策略研究
[Abstract]:Tractor automatic navigation is one of the key technologies in the development of fine agriculture. As an important part of automatic navigation technology, tractor automatic steering technology is closely related to operation quality. Based on the test platform of Dongfeng 1004 tractor with Beidou satellite navigation system, intelligent terminal and navigation controller, the steering controller of tractor automatic navigation system based on CAN bus is developed. The steering control strategy is designed and verified. Based on the PID control algorithm, the improved control algorithm, including fractional order and intelligent PID control algorithm, is studied, and the optimal comprehensive performance control algorithm is selected through simulation experiments. After the hardware design of steering system, the field test of tractor automatic navigation system is completed. The research work of this paper mainly includes the following parts: 1. This paper introduces the research status of agricultural vehicle automatic navigation system at home and abroad, the application status of CAN bus in agricultural machinery and the research status of automatic steering control strategy, and formulates the research goal and technical route of this subject. 2. Based on the composition and principle of tractor automatic navigation system, especially the function analysis of automatic steering system, a tractor dynamic model is built, and according to the scheme of automatic steering modification of tractor hydraulic steering system, The simulation model based on MATLAB/Sim Hydraulics is established. Through theoretical analysis, an automatic steering model based on transfer function is established, and the transfer function model is optimized. Based on the automatic steering PID algorithm, the improved algorithm is studied, including fractional PID and intelligent PID algorithm, and the simulation model is built to verify the control effect of the automatic steering control algorithm. 4. The hardware verification platform of automatic steering control strategy is built, the communication protocol of the system is established according to ISO 11783, and the hardware and software design of the steering control system is carried out. The installation and test of automatic steering system were carried out, and the verification test of steering control strategy was completed. The test results showed that the maximum transverse deviation of straight line tracking was 2.8 cm, when the tractor speed was about 4 km/h. The precision of automatic steering control is 2. 5 cm,.
【學(xué)位授予單位】:重慶理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:S219
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