| As electronics, embedded software and control technology developing rapidly,and the requirement of informationization,intelligent, networked of the construction machinery in infrastructure construction trade constant improving, monitor and control system of construction machinery based on embedded technology become a hot subject in the domestic and international control field.This paper sums the situations and trends of domestic and international engineering machinery firstly,discusses the demands and implements of intelligent and long-range monitoring and controlling,and constructs a three-layer model of the engineering machinery long-range monitorin and control system:the front unit control systems, the machine-mounted monitoring system and the long-range control center ; proposes a kind of structure of embedded system based onμC/OS-Ⅱ; dissects the characteristics , structure , operation and schedule principle ofμC/OS-Ⅱ, modified the kernel , and improves dependability of the schedule algorithm;designs the hardware in detail: the microprocessor AT91RM9200, the store unit , the serial interface , the human-computer interaction interface , the CAN bus control module , the debug interface and the reset circuit etc.;on this basis , succeeds in transplantingμC/OS-Ⅱto the system,sets up the operating system framework,designs the driver,sets up the institutional framework of upper user's application, provides the method and concrete application process of the Graphical User Interface module based onμC/OS-Ⅱ.The system designed in this paper, not only has the functions of local control, friendly human-computer interface, but also has various interfaces which make the system can be managed by the long-rang center. Some productions , such as the designs based on ARM, the transplantating method ofμC/OS-Ⅱ, the improvement of schedule, the hardware diver and the design of Graphical User Interface ,have values of application and popularization. |
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