| Automated Mechanical Transmission (AMT) has many merits such as simple structure, good production inheritance, low cost, good maintainability, high transmission efficiency, etc. AMT is widely accepted by automotive engineers and customers, and it has a very huge range of development and application prospects. Nowadays, the theoretical research and development of AMT products is relatively mature, while some key technologies still exist and need to be improved in the further promotion. The optimizations of actuators and control system are key points in different AMT systems, especially for clutch and shift. In addition, the integrated control is the core and difficulty.The test-bench is a good solution to research the control system and test the performance of AMT products. It can shorten the development cycle, save the test cost and limit the security risks. It's an important way to develop and promote AMT technology.In this thesis, AMT control system is researched based on test-bench about HW17910A, the main contents are as follows.Compared with automotive AMT system, the scheme of AMT test-bench is researched in detail. The dynamic characteristics analysis and mathematic models are constructed, including power source motor, clutch, and transmission. It provides a theoretical basis for later research.The working principle and characteristics are analyzed for clutch, and the electro-pneumatic actuators are modeled in AMESim for basic performance analysis. The control system of clutch consists of two parts, including target position computation and tracking control. The fuzzy controller is used to obtain target engaging speed and position, the plant model and fuzzy controller are constructed in MATLAB to analyze and verify. The position tracking control strategy is proposed based on the characteristics of electro-pneumatic actuators. The logic-switched controller is used to decide which valves to work, and the improved single neuron PID controller is used to realize PWM control for working valves. The co-simulation between AMESim and MATLAB is completed with plant model in AMESim and control system in MATLAB. It's verified that the control system proposed not only be easy to design and implement with simple structure, but also have relatively strong robustness adaptive ability.According to functional requirements, the control hardware system is designed based on Infineon XC22887M microcontroller after theoretical analysis. The signals captured by sensors are supplied to MCU for monitoring and making decision after processed. The output control signals from MCU control pneumatic actuators via solenoid driving circuits. It's necessary to debug hardware system to meet the test needs, static debug and dynamic debug are completed separately. It lays the foundation for realizing software functions.The software development and processes are introduced based on AMT test-bench and hardware function. The software is configured in DAeV firstly and programming in Keil. Programs are designed including data acquisition, digital filtering, data processing, and pulse width modulation. The basic performances of clutch are tested, which get ready for the control system implementing. The position tracking control strategy is tested on AMT test-bench compared with traditional PID, the improved single neuron PID can achieve good dynamic tracking performance and steady error. In addition, start-up program is designed and tested under different load condition, and get good performance. |
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