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The Intelligent Trend of Vehicle DVR in Dealing with Bad Environment in Vehicle
Jan 07, 2019

At present, vehicle DVR has gone through many years. And after several years of development, it has made a lot of technical improvements. However, from the current application field, it seems that it is far less optimistic than technology. This also requires that the function of vehicle DVR should be closer to the daily civilian demand in the future development. At the same time, the direction of product intellectualization is becoming more and more popular.

Market Capacity of Vehicle DVR

Domestic vehicle monitoring market originated from bus ticket box monitoring, but due to immature technology, before 2006, the market was very narrow. In 2006, Shenzhen Public Security Bureau Bus Branch presided over the construction of electronic bus monitoring project covering 13,000 buses in the city, which is a landmark project officially started by the domestic vehicle monitoring industry (for the purpose of public travel safety, government procurement, unified construction at the city level). However, due to the limitations of network technology and chip technology, the industry has developed slowly. Only when the Olympics or advertisers invest heavily can there be some larger projects.

Since the 3G licensing in 2009, the prelude to the development of on-board monitoring has been formally pulled. Because of security considerations, Jinan National Games realized the 3G video surveillance of more than 2000 buses in the city. After that, large, medium and small cities in the field of public transport followed the trend one after another and became irremediable. So far, there are few large cities without bus monitoring, and the penetration rate of bus monitoring in second and third-tier cities is very high. In addition to buses, the monitoring market of coaches, taxis and school buses has also been affected:

Long-distance bus: As we all know, long-distance sleeper bus must install video surveillance, which is a mandatory requirement of the State Security Supervision Bureau; in 2011, the Ministry of Communications JT/T794-2011 standard on two passengers in danger mentioned the video surveillance function; some provinces are under the pressure of major traffic accidents require long-distance passenger vehicles to install video surveillance, so many people in the industry carry long-distance passenger vehicles artificially. The blowout conditions for monitoring the market are ripe.

Taxi surveillance: As early as 2009, Hangzhou forced taxis to install cameras, followed by Chongqing, Xi'an, Nanchang and other cities; this year, Shenzhen also introduced similar compulsory measures, so it seems that the curtain of taxi surveillance market has opened.

School bus: Zhengning school bus accident and a series of major school bus safety accidents have finally aroused the attention of society to the safety of children in school. Under the personal supervision of Premier Wen, special school bus standards and school buses have been issued, and it is stipulated that school buses must be equipped with video surveillance before they can be put into operation.

Vehicle DVR should deal with the harsh environment inside the vehicle

It is understood that in order to ensure that the bus can still be stored smoothly in operation, the vendors strengthen the technology of vehicle DVR mainly including shock proof, voltage-stabilized current, heat dissipation, wireless transmission and so on. The perfect integration of these technologies is to further improve the stability of vehicle DVR storage.

Power supply design: In order to ensure the normal operation of the vehicle-mounted hard disk recorder, first of all, the output power of the power board must be stable. In a fixed narrow voltage environment, because the input voltage and current are basically stable, and from the electrical point of view, the output power determines the input power, so ordinary hard disk recorder power only needs an adapter, an adapter is nothing more than a transformer plus a filter circuit, a little conscience plus a protection circuit, no conscientious protection circuit installed. It's cheap, so the cost and maintenance cost of ordinary hard disk recorders are relatively low.

Future Vehicle DVR Should Be Smart

But for VHDR, the first thing to do is to narrow and refine the dynamic voltage and current. How to ensure the normal operation of VHDR, stable voltage and current is very important, but on the other hand, the input power of the equipment is fixed. It can be seen from W=U*I that the current changes when the voltage changes, and the direction of the change of voltage and current is always opposite. So if the starting voltage is lower, the relative starting current will increase. Macroscopically, it is so simple, but to achieve this function stably and ensure the normal operation of the equipment, it will take a lot of effort. The first thing to do is to design the protection circuit. We should know that the power board of the car-mounted hard disk video recorder will withstand hundreds of shocks in an hour. If the protection circuit is not well done, the power board will be damaged or the main board will be burned down directly.

Seismic design: Seismic design of vehicle-mounted hard disk video recorders is very important, in fact, how to protect the hard disk. Because the current hard disks are all mechanical spindle hard disks, the distance between the read-write head and the disk surface is only a few microns, if you look at it with the naked eye, the read-write head is attached to the disk surface, but even if you do not understand the hard disk, you should understand that the 5400-turn hard disk rotates at least 90 times per second, if the read-write head is attached to it, it will not take long for the read-write head to wear out. At such close distances, if the seismic performance is not good, as long as the read-write head has a little tremor, the hard disk will be damaged slightly, and the read-write head will crash heavily (hard disk terminology). So the hardware anti-seismic is very important.

Error-tolerant design: Error-tolerant ability of hard disk is a difficult problem that has been solved in both IT hardware industry and software industry since hard disk came into existence. For an embedded system, it is very difficult to achieve a perfect fault-tolerant and error-correcting design. But for the design of embedded system, the purpose of embedded system is to pursue better stability.

Vehicle DVR should deal with the harsh environment inside the vehicle

It is understood that in order to ensure that the bus can still be stored smoothly in operation, the vendors strengthen the technology of vehicle DVR mainly including shock proof, voltage-stabilized current, heat dissipation, wireless transmission and so on. The perfect integration of these technologies is to further improve the stability of vehicle DVR storage.

Power supply design: In order to ensure the normal operation of the vehicle-mounted hard disk recorder, first of all, the output power of the power board must be stable. In a fixed narrow voltage environment, because the input voltage and current are basically stable, and from the electrical point of view, the output power determines the input power, so ordinary hard disk recorder power only needs an adapter, an adapter is nothing more than a transformer plus a filter circuit, a little conscience plus a protection circuit, no conscientious protection circuit installed. It's cheap, so the cost and maintenance cost of ordinary hard disk recorders are relatively low.

Future Vehicle DVR Should Be Smart

But for VHDR, the first thing to do is to narrow and refine the dynamic voltage and current. How to ensure the normal operation of VHDR, stable voltage and current is very important, but on the other hand, the input power of the equipment is fixed. It can be seen from W=U*I that the current changes when the voltage changes, and the direction of the change of voltage and current is always opposite. So if the starting voltage is lower, the relative starting current will increase. Macroscopically, it is so simple, but to achieve this function stably and ensure the normal operation of the equipment, it will take a lot of effort. The first thing to do is to design the protection circuit. We should know that the power board of the car-mounted hard disk video recorder will withstand hundreds of shocks in an hour. If the protection circuit is not well done, the power board will be damaged or the main board will be burned down directly.

Seismic design: Seismic design of vehicle-mounted hard disk video recorders is very important, in fact, how to protect the hard disk. Because the current hard disks are all mechanical spindle hard disks, the distance between the read-write head and the disk surface is only a few microns, if you look at it with the naked eye, the read-write head is attached to the disk surface, but even if you do not understand the hard disk, you should understand that the 5400-turn hard disk rotates at least 90 times per second, if the read-write head is attached to it, it will not take long for the read-write head to wear out. At such close distances, if the seismic performance is not good, as long as the read-write head has a little tremor, the hard disk will be damaged slightly, and the read-write head will crash heavily (hard disk terminology). So the hardware anti-seismic is very important.

Error-tolerant design: Error-tolerant ability of hard disk is a difficult problem that has been solved in both IT hardware industry and software industry since hard disk came into existence. For an embedded system, it is very difficult to achieve a perfect fault-tolerant and error-correcting design. But for the design of embedded system, the purpose of embedded system is to pursue better stability and execution speed, but there is a problem that can not be ignored is the poor portability, which results in that once the design can not be changed too much. So its first design idea is very important. At present, the effective way for embedded system to correct hard disk errors is the ability of read and write control.

Future: Make Storage Smart

Only by continuous innovation can the market of DVR be developed faster. It is understood that manufacturers have begun to consider intelligent processing of some functions of vehicle DVR, such as increasing the functions of face recognition, number statistics, feature recognition, increasing the practicability and pertinence of vehicle system, so as to make storage more intelligent.

When a car breaks the law, the police can only catch the perpetrator by carefully observing his appearance, clothing and so on. When the perpetrator appears again, they can catch him according to their judgement. This is a very time-consuming and inflexible way. Moreover, the management center personnel will inevitably Miss certain events when they watch video playback or real-time video streams. Therefore, it will be the future development direction to implant the "nervous system" into the vehicle DVR to replace the human brain for analysis and judgment.

For the advantages of adding intelligent analysis technology, intelligent analysis technology uses the powerful data processing function of computer to analyze the massive data in the video screen at high speed, filter out the information that users do not care about, and only provide useful key information for the monitors, thus effectively saving the bandwidth and greatly improving the available network bandwidth.

More importantly, intelligent video technology can detect suspicious activities, events or behavior patterns by analyzing real-time or recorded video streams, which can make video surveillance to search for criminal suspects after the incident into an assistant means to prevent crime at that time.

Intelligence will play an increasingly important role in future vehicle DVR storage applications. Manufacturers will continue to develop more innovative technologies to ensure the integrity and availability of recorded data according to the needs of users.


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