The Design Of Dashboard System For Fuel Cell Electric Vehicle Based On ARM

Fuel Cell is a kind of installation that converts the chemical energy of hydrogen and oxygen into the electrical energy directly by the electrode reaction. It is considered as the perfect solution that will replace the internal-combustion engine in the future. This paper presents a dashboard system for Fuel Cell Electric Vehicle (FCEV) based on embedded technology, which can monitor the real time operating condition of the FCEV, acquire and restore the status data of each module, and display the information on CSTN LCD in graphical mode.In this paper, the characteristics and structure of FCEV are introduced briefly. According to the requirement analysis, chapter 2 presents the entire solution for the dashboard system. This solution uses S3C44B0X as the core processor of hardware level, on which the middleware (RTOS and GUI) is based, to build the development platform for the real time multi-tasks application software. Compared with the solutions based on PC or MCU, the system in this paper has the obvious advantages in bulk, cost, speed and power-consumption, etc.The hardware platform of the dashboard system, including the microprocessor core system, memory devices, communication bus, human-machine interface and other circuits, is described clearly in chapter 3. Due to the research on the signal integrity in high speed digital circuit, the PCB designed on dual layer board works well with excellent stability and reliability. The system startup code is designed for the hardware initialization and test.According to the actual hardware resources,μC/OS-II andμC/GUI are selected as the middleware platform of the dashboard system. Chapter 4 introduces the framework and principle ofμC/OS-II andμC/GUI, and the process of porting them on the target hardware. Besides, a perfect method is introduced to solve the problem of displaying the simplified Chinese characters inμC/GUI environment.The application development of the dashboard system is accomplished in terms of the design rules of real time multi-tasks software. The requirement of system software and the data flow relationship among the each module are described in chapter 5. The entire application is divided into several tasks with different priority. The shared global variables, semaphores and message queues mechanism are used for the communication and synchronization among the multi-tasks. It is introduced that how to design the every task of the dashboard system, especially the information display interface task based onμC/GUI. At last, the paper presents the method of system integrating, joint-debug and system test in software and hardware.