Cortex-A7 based T-BOX solution
First, the introduction of the car Internet system
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The vehicle Internet uses GPS, RFID, sensors, OBD, and T-BOX as carriers to collect information on vehicle position, speed, and route to realize dynamic information interaction between the vehicle and the public network.
Among them Telematics BOX, referred to as car T-BOX, car networking system consists of four parts, host, car T-BOX, mobile APP and background system.
The front-mounted car networking hardware is mainly based on T-BOX, while the post-installation is realized through the OBD interface. The pre-installed T-BOX can collect the most abundant vehicle data to meet more customer needs, while the OBD system faces the difficulty of cracking the private agreement of the vehicle enterprise, the location of the equipment interface is not uniform, the functions are simple and the quality is uneven.
Under such circumstances, the front-mounted T-BOX is a core automotive electronic hardware device and is expected to become a standard for smart cars.
Second, the T-BOX program analysis
On August 29, 2016, the national standard "Technical Specifications for Electric Vehicle Remote Service and Management System Part 2: Vehicle Terminal" gave clear technical indicators for the single vehicle terminal and integrated vehicle terminal.
Note 1: Integrated vehicle terminal - integrated in the vehicle terminal (automobile class) of other devices or systems of the vehicle.
Note 2: Single-type vehicle-mounted terminal - a separate device or system of vehicle-mounted terminals (industrial or automotive).
Figure 1 T-BOX project framework
Time and date
The time error is ±5 s within 24 h compared to the standard time.
2. Data storage
The vehicle terminal shall store the collected real-time data in the internal storage medium according to the maximum interval of no more than 30s. If a level 3 alarm occurs, the vehicle terminal shall save the collected data in the internal storage medium in real time according to the maximum interval of no more than 1s. .
The data internal storage media capacity should meet at least 7 days of real-time data storage.
When the vehicle terminal is powered off and stopped, the data stored in the internal medium before the power failure should be completely saved.
The 4~32G surface mount eMMC provides reliable deep storage requirements.
3. Remote control
The vehicle terminal should have self-test, remote query, remote parameter setting and remote upgrade function.
Integrate 2G, 3G or 4G wireless modules to enable real-time data upload to the cloud for intelligent control.
4. Environmental adaptability
Operating temperature range: -30 ° C ~ +70 ° C;
Storage temperature range: -40 ° C ~ +85 ° C;
A6G2C can meet the working temperature of -30 ° C ~ +70 ° C, storage temperature -40 ° C ~ +85 ° C.
5. Electromagnetic compatibility
Refer to meet the technical requirements of GB/T 18655-2010, GB/T 28046*-2011, GB/T17619-1998, etc., test level A.
The A6G2C core board refers to the technical standard of GB/T 17626.6-2008, and tests in the Chinese-style link according to the industrial four-level standard, which provides a strong guarantee for the hardware stability, electromagnetic anti-jamming performance and environmental adaptability of the core board.
Third, the market application scenario
l Bus, taxi, logistics vehicle scheduling;
l private car navigation;
l driving deviation alarm;
l unmanned;
l adaptive cruise;
l front collision warning;
l Basis for the evaluation of auto insurance claims.
The past T-BOX is a simple collection of data, and then uploaded, including OBO. The T-BOX we are developing now is actually the gateway inside the car:
Due to the different needs of each car manufacturer, T-BOX is difficult to have a unified standard in the industry.
From a hardware perspective, T-BOX will have a breakthrough in the future. Cars and homes, cars and cars, cars and people are the future direction. From the software point of view, T-BOX is likely to serve as a gateway for security information, and interact with data on the mobile phone. For example, the instrument and host in the car can not affect each other through the human-computer interaction interface. Affecting another operating system, there are also problems in practical applications (for example, T-BOX conflicts with the front radar start).
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