1 Introduction
A car tachograph is a recording device used in automobiles. The device can record and store the vehicle's driving speed, mileage and other status information about the vehicle's travel and can output data through the interface. The wireless driving recorder combines the wireless communication method with the vehicle driving recorder to realize the function of the recorder and facilitate the user to read and process the data, which can solve the disadvantages of the traditional recorder to obtain data through the medium such as the U disk.
There are many ways to communicate wirelessly, among which ZigBee wireless communication, RF wireless communication and Wi-Fi wireless communication are the most widely used in industrial applications. ZigBee is mainly used to transmit low data rate communication with ultra low power loss. The main goal is to provide device control channels. RF is widely used in communications, automotive, medical, IT and other fields, with good security. The main goal is to provide equipment control channels, and the shortcomings are poor. Wi-Fi based modules are widely used in communications and control. The communication distance is long, the security is good, the networking is simple, the secondary development technology is mature, and the price is cheap. Therefore, in the wireless communication scheme of the wireless tachograph, the Wi-Fi communication module is used to form a WLAN network to realize wireless communication of the recorder. The wireless drive recorder can be used in all types of vehicles, especially for enterprises and institutions, such as logistics companies with large fleets, stations, airports, and military logistics support.
2 system components
The wireless tachograph system mainly includes a wireless tachograph, a receiving base station and a recorder management software. The system composition is shown in FIG.
Figure 1 Wireless car tachograph system
Among them, wireless tachograph mainly completes signal acquisition, data storage and data transmission. The main functions of the wireless tachograph are as follows:
1) Real-time recording of the following actions of the vehicle: left flashing light, right flashing light, reversing light, door state, high beam, low beam, brake light, car horn;
2) Measurement, recording, storage, recording and storage of suspected data;
3) Record related parameters of the vehicle (such as vehicle identification code, license plate number, driver code, driver's license number, real-time clock, motor vehicle driver's license number issued by the public security traffic management department, maximum speed of the vehicle);
4) transmitting the driving data of the vehicle by reading data or wirelessly transmitting through the U disk;
5) Driving time record, overspeed, fatigue driving alarm.
The main function of the receiving base station is to receive the data sent by the wireless tachograph and transmit it to the upper computer. The wireless tachograph can be configured to be used as a receiving base station. The functions are as follows:
1) Perform corresponding processing on the information transmitted by the recorder;
2) Send to the recorder management software computer through the serial port;
3) receiving the corresponding instruction of the host computer and forwarding it to the recorder;
4) Data wireless transmission function.
The recorder management software mainly completes the analysis of the data collected by the recorder, the data management function, and the configuration of the recorder function. The function is as follows:
1) Describe the entire driving process in real time, and play back the driver's entire driving process;
2) reading the original data recorded by the recorder;
3) Query the data in the database and statistically analyze the data uploaded by different recorders;
4) Perform chart processing on the obtained data to obtain a management reference.
Waterproof Speaker,Full Range Loud Speaker,Entrance System Speaker,Waterproof Multimedia Speaker
Jiangsu Huawha Electronices Co.,Ltd , https://www.hnbuzzer.com