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Car DVR purchase
The past two years on the market a variety of car DVR, in order to enter the market to earn the
normal development of the surveillance industry into a pot of gold of the car industry, embedded
DVR car DVR to sell a serious impact on car . Discussion points selection method, designed to
initiate, and also hope that in order to regulate the vehicle to monitor the industry to offer a
modest force.
Urban public transport, long-distance passenger transport, traffic management, transportation
administration, law enforcement, banking escort industry, the demand for on-board DVR
increasingly strong, Shenzhen, Guangzhou and other places has begun to implement
comprehensive monitoring of buses across the country in Beijing, Shanghai, Zhejiang and other
have followed suit. Faced with a brand new huge car surveillance market, a large number of
engineering companies on how to select products to worry about, a lot of projects with
inadequate product or this does not belong to this industry's products, failure of vehicle
engineering daunting , how many Contractors after-sales service and battered ...
We have to talk about Car DVR enterprise, quite a lot of the so-called Car DVR corporate
figurehead, an actual stable operation of the product, there is no practice and guidance of
operations personnel, and (3), there is no matching products and services, but stay away; know
the high-priced to sell professional products, know the inside story of the pursuit of short -term
interests, the next stuffy brain driven by the interests tie into the scarred security industry, it is
many years without violence products ", which so many businesses are" tasteless gesture ".
Car DVR manufacturers I think can be divided into three categories:

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Categories: professional development for production of such enterprise completely independent
research and design products, at least more than 2 years of car DVR R & D experience, such
enterprises, product comparison, product quality is reliable, customers can get follow-up
technical support and service.
The second category: the production and processing category, such enterprises will generally
public board program production, different customers different options, at an average
functionality, stability in the hands of customers, the stability is not to say, it may introduction of
many models for customers to select, low-cost low-end quality, high-cost high-end quality
services will be relatively weak.
The third category of products for OEM manufacturers, the procurement of such factory of other
companies posted their own company brand sales in the technical basic not only focus on
product prices and sales links, the service would not have said.
Converted into Car DVR enter the market, with embedded they are generally common embedded
DVR, its simple to change to change as a car DVR to sell such products do not belong to a
professional car DVR, so the manufacturers of such not discourse, and certainly not standard.
How to judge the pros and cons of the product? From product features, file system, power
handling, shock to deal with several aspects of analysis, the stability of the product is a
combination of factors, what power supply design, shock-proof design, documentation, system
design, in fact, every point is very important that any design defects will affect product stability.
, Car DVR product features
First video to be clear: the video data to achieve at least CIF (354 * 288) resolution, the minimum
should be to achieve near real-time results (requirements of a bad place or require low-end
price), but now the full real-time video and smooth in order to be considered monitoring. Of
course, as the requirements continue to improve the effect of D1 also went to the interview,
while the embedded industry in general has 8 channels and 16 D1 effect; D1 (704 * 576) clarity
improved, doubled;
Low power consumption: is energy-saving, low heat, because the car is battery powered, easily
lead to vehicle loss of electricity can not be launched, and reduces the battery service life of the
car costs; low heat stable work environment, reduce the loss of the machine itself; the device
connected to the ACC ignition switch can be part of the solution of this problem, some people
said equipment in a power outage would work great harm to the Car Why do power protection
and power-down restart delay switch machine is to solve this problem.
Automatic recording function: in ordinary DVR button is indispensable, because he was to control
the action, referred to as "semi-automatic, Car DVR is unmanned, it's running set are good,
man-made changes can not boot automatic recording after power failure.

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Anti-machine function: automotive work environment is relatively complex, unforeseen
circumstances may occur, products in the operation of a sudden does not recognize the state of
the storage or crash, the general product can not be restored, but with a "watchdog" function is
not , it can automatically restore; select the product is also an important condition.
Data storage, security and ease of browsing: the event of an accident customers need timely
access to video data, car DVR products must consider the video data integrity and security
software products require a relatively high.
Second, car DVR power supply design
Car
Car DVR power supply design of great stress. Automotive power from car battery DC12V-DC24V,
launch, brakes, fuel door and the process of moving the battery output voltage is very unstable,
especially in the ignition voltage will be the engine freely low, and in the slam on throttle when
the voltage may rise very high, the instantaneous voltage in different operating may be more
than 48V, thus requiring the power supply design can adapt to this environment vehicle DVR
products. Create a video to the operating voltage range of products for the design of 8V ~ 36V, an
instant impact on the voltage range of 6V to 110V, in order to ensure that equipment when the
normal working of the low pressure, instantaneous pressure can also be a good protective
equipment is not damaged .
, Car DVR file system design
DVR can be one in recent years in succession into the product of the public safety industry,
already popular in other countries; so many design ideas are in the range of international (Taiwan,
South Korea), many of our businesses is not read and write the software functionality of the
products are generally modified from; Car DVR products are currently on the market continue to
use the ordinary DVR file system, the type of file system is very fragile and unstable; not in the
vehicle monitoring will cause many problems, to create a video for a dedicated file system, has
strong stability of the car DVR products will not cause a system crash because of a variety of
unusual circumstances.
Fourth, Car DVR shock-proof design
Buses, long distance bus, public security, fire, traffic police car, ambulance, passenger trains,
freight cars, trains and so on the installation of car video recorder with different levels of degree
of demand, but due to the different condition, road conditions, vehicle shock treatment became
the most basic requirements of automotive digital hard disk recorders.
Car DVR, the most expensive part is the hard disk, so car shock absorbers need more traffic to do
a specific analysis, standard shock treatment to have the hard drive 4:00 vacant shock, external
can be equipped with chassis 4:00 suspension shock absorbers a system to complete the overall
shock (not suitable for all environments, the special environment can make a special request);

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inadequate suspension system often have not read and write, crashes, etc. problems.
Car digital hard disk recorders currently on the market most of the spri ng, wire or rubber shock
pad as a shock material can play a certain role in anti-shock protection; spring within the elastic
range, extrusion beyond suffered under severe vibration conditions, spring spring elastic range,
you will not achieve shock effect; spring with shock effect only in the vertical direction, actually
Car Digital Video Recorder in a driving state (especially in poor road conditions) and its direction
of vibration is irregular These factors limit the effect of the spring shock, prolonged use of easily
deformed. Early form of wire shock is in the automotive industry in recent years, due to the
exclusion of commonly used in embedded converted into on-board recorders on so often, the
wire compared to the spring is definitely superior because of its toughness is very good in the
model weight proportion under relatively suitable wire as necessary aspects of the design
professional design concept, single-piece design is not mature enough, resulting in the wire shock
misty concept, still in the test wire anti-shock technology available in the market now; pads /
apron shock rise, not only to increase the buffer in a certain interval, but also very relaxed back to
its original state, the pad / rubber ring buffer is very peaceful with the product fit and squeeze to
change their shape With the changes in the environment, and can change its highly adaptable,
you can choose a different toughness of the pads, shockproof to improve a lot compared to the
previous two but with significant advantages, but there are disadvantages, pad / apron
particularly harsh environment for a long time, easy to damage deformation, but regular
maintenance or replacement, steel wire and springs of the cost comparison, is very simple.
Electronic earthquake is also a vehicle must have a technology, general production will become a
problem, car DVR record carrier in the vibration of the hard disk drive read and write will be
affected, often can not replicate, reading does not to the hard drive, etc. (hard disk crash in
suspended animation) to create a video Car DVR not only has the hardware shock superiority, but
also with the software (electronic) and anti-crash function can effectively guarantee the stable
and reliable operation of the equipment.