Harsh Environment in Vehicle Accelerates Car DVR Intelligence

From the start of 3G licensing in 2009, the prelude to the development of on-board surveillance was officially opened. At present, the car DVR has passed many years. And after years of development, it has indeed achieved a lot of improvements in technology. However, from the perspective of the current applications, the development of the technology is much worse. This also requires that the functions of the vehicle-mounted DVR should be further developed to meet the needs of daily civilian use in the future. At the same time, the direction of product intelligence is becoming increasingly popular.

It is understood that in order to ensure that the bus can still be stored smoothly during operation, the strengthening technologies of the vehicle-mounted DVRs by the manufacturers mainly include anti-shock, regulated current, heat dissipation, and wireless transmission. The perfect combination of these technologies is to further improve the stability of the car DVR storage.

Power supply design: In order to ensure the normal operation of the car DVR, we must first ensure that the output power of the power supply board is stable. In a fixed narrow voltage environment, because the input voltage and current are basically stable, and in terms of electricity, the output power determines the input power, so only one adapter is required for the power supply of an ordinary hard disk video recorder. An adapter is nothing more than a transformer. A filter circuit, a little conscience plus a protection circuit, no protection of the conscience circuit is not installed, cheap thing, so ordinary hard disk video recorder costs and maintenance costs are relatively low.

However, for car DVRs, the first thing to do is to narrow down the dynamic voltage and current. How to ensure the normal operation of the car DVR, a stable voltage and current is very important, but on the other hand, the input power of the device is fixed, by W = U * I know, the voltage is changing when the current is changing, the voltage is The direction of change of current is always the opposite. So if the starting voltage is lower, the relative starting current will increase. Macro is simple, but can do this function and ensure the normal operation of the equipment, it may need a lot of efforts, the first is to protect the circuit design, to know that the car DVR power board within 1 hour to When subjected to hundreds of shocks, the protection circuit does not perform well, and if the power board is damaged, the power board is directly damaged and the motherboard is burned.

Anti-seismic design: The seismic design of an on-board DVR is very important. It is actually how to protect the hard disk. Because the current hard disks are mechanical spindle hard disks, the distance between the read/write head and the disk surface is only a few microns. If you look with the naked eye, the read/write head is affixed to the disk surface, but even if you don't understand the hard disk, you should understand that 5400 The rotating hard disk must be rotated at least 90 times per second. If the read/write head is attached to it, the read/write head will be worn out before long. Such a close distance, if the earthquake is not doing well, as long as the read-head has a little bit of trembling, if the hard disk is bad, then the head is crashed (hard disk term). So the hardware earthquake is very important.

Fault-tolerant and error-correction design: The fault-tolerant and error-correcting capability of hard disks is a difficult problem that the IT hardware industry and the software industry have been trying to solve since the hard disks were available. For an embedded system, it is difficult to achieve a very perfect fault-tolerant and error-correcting design. However, the intention of the embedded system design is that the embedded system is originally designed for the pursuit of better stability and execution speed, but there is a problem that cannot be ignored that is poor portability, resulting in a design that cannot be too Big change. So its first design idea is very important. Embedded systems for hard disk fault tolerance error correction, the current effective way is to read and write control capabilities.