Design Of Embedded Electronics Measurement System For Automotive Body Based On ARM Cortex-M3

Automobile body structure is one of its key factors to ensure vehicleperformance and traffic safety. Traffic collision and driving under adverse roadconditions can cause the deformation of the automobile body structure. In ourcountry, most of automobile service factory still use the traditional tools to measuresome critical dimensions during service. The article developed an electronic systemwhich was used for measuring the critical dimensions of automobile body structure.This electronic system and the mechanical structure of the measuring machine formintegrated measurement equipment. It has an internal database involved automotivecritical dimensions, data of measured can be compared with data in the database,measurement result can be saved and efficiency of measurement was highlyimproved.The main content of this paper revolving around four aspects as follows:kinematic model of the measuring machine, design of system hardware, design ofsystem software, system debugged and verified. First, according to the mechanicalstructure of measuring machine and the installation position of the sensors,measuring machine was kinematic modeled using the DH method and MDH method.The core of the system hardware used microprocessor based on ARM Cortex-M3.High resolution optical encoders were selected as angle sensor in the system. TheSD card was used as data storage medium in this system. It also has variety ofwired or wireless communication interface, such as USART, USB and Bluetooth.The touch screen was selected as the input and output devices. System softwaredesign is another important part of this article, which is based on embeddedoperating system. The design method of used is different from the traditionalembedded software design method. The functionality of system was divided into anumber of tasks which were running based on the operating system. The systemfunction can be done when those tasks were running in parallel. The systemsoftware can be updated in the application programming.Finally, many related functions of the system had been debugged and verified.Through the analysis of experimental data, the precision of the system meet thedesign requirements.