车载虚拟仪表及诊断系统的设计与实现

DESIGN AND IMPLEMENTATION OF VEHICULAR VIRTUAL DASHBOARD AND FAULT DIAGNOSIS SYSTEM

论述基于Android平台的车载虚拟仪表及诊断系统的软硬件设计过程。在具体实现上,利用ARM+Android体系构建终端仪表装置,在此基础上完成Android下CAN驱动的移植、车辆数据采集、图形化虚拟仪表显示以及故障诊断等功能。该装置借助Android特有的Surface View类实现了将车辆状态数据以图形化的方式展现在LCD触摸屏上,从而取代了传统的仪表盘。此外,还可以实时监测汽车运行和各ECU工作状态。当出现故障时,进行诊断,并第一时间为车主提供故障详情及维修建议。最后,采用d SPACE实时仿真系统与本装置构成闭环的测试系统来进行硬件在环(HIL)仿真测试,结果证明该装置性能稳定、显示效果良好,故障诊断功能全面、准确。

In this p a p e r, we discuss the design process o f hardware and software o f A n d ro id platform -based v e h icu la r v irtu a l dashboard andfa u lt diagnosis system. In regard to spe cific re a lisa tio n , we made use o f A R M + A n d ro id system to establish te rm in a l instrum en tation devices.O n this b a s is , we com pleted the fun ctions o f d riv e r tra nsplan tatio n o f C A N , veh icle data a c q u is itio n , graphica l v irtu a l dashboard d isp la y andfa u lt diagnosis u n der A n d ro id . The in stru m e n t realises the d isp la y o f c a rs, state data on LC D touch-screen in the fo rm o f graphic picturesthrough un iq ue S urfaceV iew o f A n d ro id system , so that it replaces the tra d itio n a l instru m e n ta tio n acco rding ly. In a d d itio n , the in stru m e n t canalso tim e ly m o n ito r the w o rkin g status o f cars and EC Us. W hen a fa u lt occu rs, the system makes the diagnosis, then im m e d ia te ly providesowners w ith the fa ilu re de tails and re p a ir suggestions. F in a lly , we carried out the H IL sim u la tio n testing by com posing a closed-loop testingsystem w ith dSPACE re a l-tim e sim u la tio n system and this in s tru m e n t, and the results proved that the instrum en t had stable perform ance, andgot a be tter visual effect as w e ll. The fa u lt diagnosis fu n c tio n was also accurate and com plete.