Automotive monitoring vehicle terminal solution for public transportation
With the rapid development of China's national economy, motor vehicles are increasing, which brings with it many problems such as traffic, vehicle safety and vehicle management. The program combines GPS technology, wireless communication technology, image processing technology and GIS technology for remote real-time monitoring of automobiles and equipment, and has functions such as monitoring, anti-theft, monitoring and positioning for automobiles.
system introduction
As a bridge between cities and cities, public transportation serves many consumers, and its safety management is related to the vital interests of no consumers. Therefore, how to use high-tech and modern management methods to improve the safety factor of vehicle business and ensure the safety of vehicles, goods and personnel, and improve the use efficiency of vehicles and reduce the occurrence of accidents through reasonable dispatch has become an urgent problem to be solved. .
Vehicle monitoring system came into being
The program combines GPS technology, wireless communication technology, image processing technology and GIS technology for remote real-time monitoring of automobiles and equipment, and has functions such as monitoring, anti-theft, monitoring and positioning for automobiles.
Product block diagram
As the core product in the vehicle monitoring system, the car GPS terminal constantly seeks better solutions in terms of functions and costs. For the different functional requirements of the car GPS terminal, we can provide different program recommendations.
Microcontroller section
In the selection of the microcontroller, due to the different positioning and requirements of the product, the choice of the microcontroller is not the same, but the price/performance ratio is definitely an important parameter for the selection. Therefore, in the general scheme and the low-cost scheme, we give Recommended as follows.
Power section
Car battery packs, passenger cars are generally 12V, and large vehicles are 24V, but the DC output is very unstable. Wide voltage variation range, instantaneous high voltage and other phenomena. Currently, the common use of wide input DC / DC conversion to 5V output provides a stable and reliable input for the back end LDO. In terms of power supply, ON DC's DC/DC mature solution LM2596 and wide voltage input DC/DC power supply NCP1034 can be used. The linear regulated power supply can be used with EXAR's general-purpose LDO SPX1117.
Communication part
Communication is basically short-range communication, and RS232 interface is used for communication with peripherals. RS485 interface is also reserved, and the CAN-Bus interface with the vehicle in the network is reserved. In terms of interface, EXAR has many years of mature RS232 and RS485 interface chips, and CAN-Bus network interface chip, NJA provides TJA1040, TJA1042, TJA1050, TJA1051 have been mature applications in the market, and now new TJA1057 provides customers with higher performance and lower cost solutions.
Memory
NorFlash is the main location for storing data in the terminal. It is used to access track data, sounds, pictures, fonts, etc. for no less than 2 hours. In addition, in some products, it is required to save track data 2 seconds before power-off for abnormal power failure. Therefore, the non-volatile RAM will be used. In these two aspects, we can provide Wanghong string, parallel Nor Flash, and Everspin's magnetoelectric memory MRAM. .
Other devices
For the in-vehicle equipment, the working environment is relatively harsh, so in some communication interfaces, it will not only receive static electricity and pulse shock caused by external interference, which leads to product damage and affects the use of the product. Therefore, in the common USB, RS485, CAN and other aspects, it is recommended to use some ESD protection devices, for some input and output switching, also do some protection.
In the "two passengers and one danger" vehicle, the driver must be managed, and the driver's driving qualification needs to be verified. In this aspect, the RF card reading device used by the company can provide related products of Shanghai Fudan Microelectronics, such as FM1702, and NXP-compatible FM175xx series products, etc.
to sum up
Today, with the increasing number of motor vehicles, car driving safety is increasingly concerned. Dangerous driving such as drunk driving, drunk driving, and fatigue driving are often prohibited. How to better supervise and eliminate dangerous driving has always been a problem that the relevant departments are seeking to solve. The establishment and improvement of the vehicle monitoring system will be expected to play a greater role. Perhaps in the near future, once the driver has drunk, he will be “refused to drive†by the vehicle; if the driver continues to drive for more than the prescribed time, he will receive a “warning†from the vehicle, and will also receive the driver’s warning. Real-time warnings from relevant departments and may be rejected by the vehicle. In-vehicle monitoring system, all in order to reduce the risk of security incidents.
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