Design And Implementation Of Embedded Intelligent Control Platform For Construction Machinery

In recent years, a lot of new technologies emerge in the field of construction machinery, such as the condition monitoring, the fault diagnosis, the intelligent control of engines, the intelligence of human-computer interaction etc. This project has developed a control platform which can go with a variety of Construction Machine control systems. It can be realized in different Construction Machine control system with just modifying the application software according to the application. The controller consists of two major components:the human-computer interaction module and the monitoring module. The human-computer interaction module accomplishes the information exchange between operators and the monitoring module, while the monitoring module complete the machine’s motion control and monitoring of operating status. The Human-computer interaction module uses a large high cost-effective monochrome LCD (Liquid Crystal Display) screen for graphical display. Visual design for operators has been done to the menu structure and the graph of the interactive interface. According to the characteristics of construction machinery in the outdoor work, temperature compensation has been applied to the contrast of the LCD screen, thus it will not be changing obviously due to changes of the ambient temperature. The module software is a front and back office system. Namely the front system completes interrupt service routine while the background system completes the task-level program. The Monitoring module uses the STM32F103ZE with the ARM Cortex-M3kernel as the processor. It has designed functional circuits for the control of a variety of construction machinery. Through the design of a practical, simple and reliable CAN communication protocol, we achieve reliable communication between human-computer interaction and the monitoring module. Also as we establish a real-time operating system with the μC/OS-Ⅱ kernel in the Monitoring module, users can apply it to different construction machinery through corresponding applications in the operating system according to the requirements of the controller functions.The functional circuit of the control platform performance testing, including DO, DI, AI, PI, PWM output, the CAN module and system power, experiments show that the circuit performance of each function to meet the requirements of the construction machinery control. In order to verify the design performance of the control platform, we conducted several application tests in the paver running control system. We designed an application and used different control algorithms for the constant speed walking test. Results show that the fuzzy PID control algorithm gets higher control accuracy compared to the PID algorithm or the fuzzy control algorithm.