About GPRS communication
GPRS is the abbreviation of General Packet Radio Service. It breaks through the way of thinking that the GSM network can only provide circuit switching, and realizes packet switching by adding corresponding functional entities and partially transforming the existing information base station system. , the investment in this transformation is relatively small, but the user feedback data rate is very impressive. GPRS (General Packet Radio Service) is a data transmission technology based on the Global System for Mobile Phones (GSM), which can be said to be the continuation of GSM. GPRS is not different from the previous continuous channel transmission method. GPRS transmits in a packet (Packet) format, so the cost borne by the user is calculated in the unit of transmission data, not the entire channel used. Theoretically, It’s a bit cheaper than that. модбус Ethernet
The transmission rate of GPRS can generally be increased to 56bps or even 114Kbps. Because there is no longer a need to add a communication intermediary switch to existing wireless applications, both connection and transmission are more convenient and easier. Therefore, users can choose to surf the Internet online, participate in video conferences and other interactive communication, and users on the same video network (VRN), even without dial-up Internet access, and continue to maintain a connection to the network.
GPRS technology embodiment
Wireless packet-switching technology
GPRS general wireless packet service is a wireless packet switching technology based on the GSM system. Packet switching technology, also known as (data) packet switching technology, divides the data transmitted by users into a certain length. A part of a separate area is called a packet, a technique for transmitting information by transmitting packets. It is a kind of exchange technology that realizes the communication between computers and computers through computers and terminals. The quality of transmission routes is not high and the network technology means is relatively simple. There is a packet header (packet header) in front of each packet to indicate which destination address the packet is sent to, and then the switch forwards each packet to the destination according to the address mark of each packet. This process is called packet switching.
packet technology
The so-called packet means that data must undergo some specific processing in the communication system before it can be transmitted in the network. A specific communication protocol is used for data transmission. This process is like packaging and dispatching packages according to classification, which is called packaging.
GPRS transparent transmission module
E840-TTL-GPRS03 is a GPRS transparent transmission module launched by Ebyte. The software has complete functions and covers most of the conventional application scenarios. With simple settings, two-way data transparent transmission from the serial port to the network server can be realized. The module uses 2.0mm pin headers to facilitate the integration of user equipment and uses a wide voltage of 5V to 20V for power supply. It supports mobile and China Unicom 2G cards. конвертировать ethernet в wi-fi The communication and LED indication use compatible levels. The default 3.3V can be applied to the 5V level. It has the anti-interference ability and can be used in some environments with strong electromagnetic interference, such as in some power industries.
Month: October 2022
Electric car safety, do you still dare to buy an electric car?
“Compared with the mature technology of fuel vehicles, electric vehicles still need to improve a lot.”
Now is the golden window period for electric vehicles. With rising fuel prices and the development of intelligent driving technology, more and more users are buying electric vehicles, and the number of electric vehicles is increasing year by year. Vehicles are powered by electric energy, and safety has increasingly become a pain point for users. конвертировать ethernet в wi-fi
Because of the car accident of star Lin Zhiying, not only Tesla, but the safety of electric vehicles has re-entered the public’s field of vision, and people are again skeptical about the safety of electric vehicles. Racers and all-around champions with fast enough reflexes will have car accidents, not to mention ordinary drivers?
Intelligent driving
The smart cockpit of an electric vehicle provides the driver with more information interaction functions, which increase the richness and convenience of use and improve the driving experience. But at the same time, too many interactive functions will distract the driver’s attention and energy and interfere with driving.
Even if car manufacturers have designed many solutions to solve these problems, such as voice control, head-up display, etc., these product technologies have not reached sufficient maturity. On the contrary, products with immature technology may also have problems such as inaccurate speech recognition, insensitive operation, visual interference, complex central control operations, network delays, and black screen of the car and machine, which are more likely to interfere with driving.
Smart Electric Vehicle IoT Application
Taking Autopilot as an example, the current state of autonomous driving technology is still immature.
1. Wireless sensor sensing failure
For example, Tesla, Tesla’s autonomous driving perception unit mainly uses multi-camera visual perception technology, assisted by a single long-range 77GHz millimeter-wave radar fusion solution. Tesla has already encountered many obstacles, and the vehicle has not taken any deceleration or steering avoidance actions and has directly hit the obstacle. Most of the hit objects are white and static, which is more likely to cause Tesla’s automatic driving visual perception failure.
2. The intelligent algorithm is immature
In order to master more road features, simulate human driving style, and achieve a reliable level of autonomous driving, neural networks need to be trained and tested on representative datasets (driving behavior, complex environments, etc.) Advanced simulation software and user experience are combined to achieve multi-attribute balance and continuously optimize the autonomous driving model. Therefore, the automatic driving model is gradually optimized and mature, and before it matures and perfects, the initial users are equivalent to the experimenters to a certain extent.
Many functions of intelligent driving of electric vehicles are new to ordinary drivers, and the experience is very unfamiliar, which will lead to wrong driving cognition, wrong operation response, and it is difficult to perceive some potential safety hazards. Intelligent driving requires drivers to experience and adapt gradually. модбус Ethernet
Power Battery
There has been much news of electric vehicle battery fires in recent years, and battery safety has always been the biggest concern for consumers when buying electric vehicles. Electric safety is more important than intelligent driving.
The main safety problems of batteries at this stage are as follows:
1. The battery has occasional quality problems;
2. The consistency of the cells is not good, and there is liquid leakage and short circuit;
3. The wiring harness in the module is improperly laid out, and the insulation layer is worn and short-circuited due to extrusion and other reasons;
4. The poor production consistency of the electrical components of the battery pack leads to local overheating, etc.
These conditions may lead to thermal runaway of the power battery, causing the electric vehicle to catch fire.
In response to the above-mentioned hidden dangers of batteries, various battery manufacturers and automobile manufacturers are committed to the pursuit of battery product safety, and conduct research and development and testing higher than national standards; real-time monitoring of battery voltage and battery temperature, battery management system BMS power-off protection, release Battery voltage, called the thermal management system to cool the battery, etc. are all effective means to prevent “thermal runaway”.