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车辆自动识别系统,顾名思义,“自动识别”就是解放人力,利用计算机控制的系统实现车辆的识别。车辆在经过收费口时无需停车,通过安装在车辆上的车载机和安装在收费口处的终端设备之间的“对话”实现车辆身份即车牌号信息以及高速公路收费口信息的交换。出站口处终端设备中的PC机根据车辆的类型和上站口的信息进行费用的结算,再经由计算机网络与车主的银行帐户相连,实现费用的自动扣除。车载机和终端设备之间的对话是以短距离无线通讯的形式实现的,实现无线通信功能的是芯片nRF401,车载机系统内部信息交换采用模拟Ⅰ2C总线来实现。
Vehicle automatic identification system, as the name implies, “Auto Identification ” is the liberation of manpower, the use of computer-controlled systems to achieve vehicle identification. The vehicle does not need to stop when passing the toll gate, and the identity of the vehicle, that is, the license plate number information and the highway toll gate information are exchanged through the “dialogue” between the onboard device mounted on the vehicle and the terminal device installed at the toll gate. The PC in the terminal device at the exit station settles the charges according to the type of the vehicle and the information on the station, and then connects with the owner’s bank account through the computer network to automatically deduct the expenses. The dialogue between the in-vehicle device and the terminal device is implemented in the form of short-range wireless communication, and the chip nRF401 is used to realize the wireless communication function. The internal information exchange in the in-vehicle computer system is realized by using the analog I2C bus.