Gps speed limiter.Reliability requirements for automotive GPS locators

　　GPS vehicle positioning equipment has extremely high reliability requirements, mainly manifested in strict working requirements of GPS equipment, harsh working environment of GPS equipment, strong vibration and impact of GPS positioning equipment, harsh electromagnetic environment, and complex functions

　　1. Strict job requirements

　　The GPS in car system bears the responsibility of safety prevention, management and scheduling, requiring it to be able to call and respond at any time, and must work 24 hours a day, especially for security products, which must play a role in critical moments. Therefore, the in car system must be able to work normally for many years without shutting down, crashing, or malfunctioning. Its work requirements far exceed the computer systems of household appliances, mobile phones, and even cars, In these systems, the CPU can be restarted through shutdown, battery replacement, power outage, and other methods to clear accumulated error states. Even if an error occurs, it will not cause significant losses, while abnormal operation of the GPS car mounted device may cause property or even life damage. The working requirements of GPS car mounted devices have reached the same level as those of large network servers and telecommunications communication systems. It is necessary to design and produce car mounted devices in accordance with the reliability requirements of uninterrupted communication systems. It is not allowed to manually power off or reset GPS car mounted devices. Installing power switches and reset buttons on GPS car mounted devices is unimaginable.

　　Just give an example to illustrate:

　　Assuming that the software failure time of the onboard computer is 6 months, which means that the problem occurs once every 180 working days on average. This indicator means absolute reliability for household appliances, mobile phones, computers, and cars, because they will never work continuously for 180 days, or even 10 days. The accumulation of software errors in the first 10 days can be considered as 0. As long as the computer is shut down or powered off, the software status will start from zero again. In fact, sometimes computers can't hold on for even 10 hours and crash, but we believe that computers are already very reliable because we finish work and shut down in 2 hours. Even if we can't hold on for 2 hours, it's best to restart them once. And car mounted machines must work continuously for years and months. If the number of machines running on the market reaches 2000, it means that an average of 10 machines fail every day. What if we sell 20000 or 200000 machines? The answer is impossible because users are afraid to buy anymore.

　　2. Strict working environment

　　The GPS in car system works on the vehicle. According to the standards of the automotive industry, the design standards of in car electronic equipment are between industrial and military levels, and its most important indicator is the ambient temperature range. The equipment working in the engine compartment requires a working temperature range of -40 to 125 ℃, and the rest requires a working temperature range of -40 to 85 ℃. In car GPS equipment is generally installed under the dashboard of the car, and some cars in poor condition, The engine heat will leak here, and the temperature of the car will be very high after long-term operation. We have tested several taxis that have been working continuously for nearly 20 hours. Some parts of the dashboard where the onboard unit is installed have reached a temperature of 90 ℃, and the surface temperature of the GPS board CPU chip inside the machine has even reached 98 ℃. Due to the vast territory of our country, the winter temperature in the northernmost part can be as low as -30 ℃ or below, which also puts forward strict requirements for the low-temperature working characteristics of on-board computers.

　　Due to the fact that cars work outdoors, they may also encounter various unfavorable factors such as water vapor, dust, oil pollution, corrosive gases, liquids, etc.

　　Therefore, the working environment of GPS car mounted devices is extremely harsh. If the telecommunications switch equipment is placed in such an environment to work, it may have been paralyzed long ago.

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