China's Minister of Science and Technology Wan Gang has said that the government supports domestic auto companies to develop alternative energy vehicles, aiming to have 60,000 alternative energy vehicles on the road in 10 cities in 2010. With the increasing awareness of environmental protection and the promotion of energy vehicles in the world, energy vehicles will occupy an important position in the future automobile market. If the incompleteness of supporting facilities such as charging stations in the past limits the development of electric vehicles to a certain extent, Then this problem is gradually being solved.
According to media reports, many provinces such as Fujian, Zhejiang, Jilin, Anhui, Jiangsu, Shanxi, Jiangxi, and Shandong have successively established electric vehicle charging stations. The fierce competition around the huge “cake†for charging electric cars has quietly begun. Initially, the issue of the popularity of electric vehicles and the construction of charging stations was a question of whether there were chickens or eggs first. In the field of new energy, after the battery has made breakthroughs as a key component and technology, the charging station is expected as a bottleneck for promotion.
The electric vehicle charging pile adopts the AC and DC power supply mode, which does not need to be refueled, avoids the emission of exhaust gas and pollutes the environment, and conforms to the concept of China's future urban development with low carbon as the core element.
First, electric vehicle charging pile terminal control solution
1. System Overview
Recently, Hangzhou Pingwang collected and adopted the design requirements of electric vehicle charging stations in many provinces and cities in China, and cooperated with many domestic electric vehicle charging station manufacturers to develop and design self-service intelligent electric vehicle charging pile terminal control solutions and products based on ARM architecture.
2. Electric vehicle charging solution block diagram
The above figure shows the functional structure diagram of the electric vehicle charging pile solution designed according to the requirements of the charging station system. The main functions of the charging cabinet terminal are data acquisition, charging control, pricing settlement, data transmission, parameter setting, display and operation, and secondly. It is an advertising and promotion function. As can be seen from the composition diagram, the controller needs to be connected to the charging unit to realize the power detection and charging control of the car battery, and generally uses a serial port connection. To achieve credit card consumption, you need to use a serial port to connect the card reader. If you need to print the document, you need to connect the serial port to the printer.
Electric vehicle charging stations are generally built on the side of outdoor roads. High temperature, dust and moisture have become hidden dangers of charging pile terminals. For these hidden dangers, Hangzhou Pingwang adopts industrial design concept, and all selected accessories and materials can reach relevant temperature. And the indicators of service life, so as to solve the worries of such problems. The electric vehicle charging pile control scheme enables the owner to operate the charging terminal freely, thereby detecting the vehicle's electric quantity and charging the electric vehicle, and can perform charging and printing out the document through the self-service recharge card.
3. Electric vehicle charging pile program Product features:
Industrial LCD screen with high brightness and wide viewing angle
The whole machine has no fan cooling, thus avoiding the crash caused by the fan problem.
Stylish and safe industrial design
Use onboard FLASH and CF card or SD card, the main purpose is to install operating system and store advertising content
Use 220V input, built-in switching power supply, convert to 12V for motherboard use
The server can control each self-service charging terminal via Ethernet
Self-service card charging service and consumer document printing
Automatically switch advertising playback system
Full touch voice prompt operation interface
4. Advantages of electric vehicle charging pile scheme design
LCD screen: wide temperature industrial LCD screen with high brightness and wide viewing angle;
Touch control: The high-quality resistive touch screen can be used to prevent detachment and malfunction in frequent use and dusty environments. And can continue to work if the surface is scratched;
Storage: It is mainly used to install operating system and storage advertisements. It adopts industrial-grade solid-state hard disk, which has the characteristics of high anti-vibration, dustproof and low heat generation. It adopts fixed design with the main board to avoid system instability and other factors.
Power supply: 220V power input and wide voltage power supply.
Structure: According to the demand and its use environment, the chassis is made of aluminum alloy panel + sheet metal back cover. It has the characteristics of firmness, good seismic performance, fast heat dissipation, dustproof and splash proof. The panel is directly made of aluminum alloy wire or fine sand. Silver-gray oxidation treatment, does not absorb heat in the sun, so as not to overheat the summer temperature, the internal temperature can not be dispersed. The controller will be flush mounted, requiring IP65 protection on the front panel and appropriate vents on the back cover. The installation is fixed with 4 snaps.
Second, charging pile control system solution
This program describes the application of the EPC-9200 industrial control board in the electric vehicle charging pile system. Manufacturers can quickly assemble the charging piles with our company's solution and quickly occupy the market.
1. Overview of the program
There are many internal equipments for charging piles, and most of them are RS-232 interfaces. If each device is connected to the industrial control board with one cable, the internal circuit will be quite complicated, and the reliability and electromagnetic compatibility will be greatly reduced. Using CAN bus communication, signal line complexity can be reduced, and more devices can be easily extended. The product scheme of using EPC-9200 of Guangzhou Zhiyuan Electronics Co., Ltd. is shown in the figure below.
Charging pile system solution
The charging pile data processing and human-computer interaction are mainly realized by the EPC-9200 industrial control board. It uses the Cortex-A8 architecture and operates at 800MHz with pre-installed WinCE or Linux operating systems. The main advantages are as follows:
Rich interface: 6-channel RS-232 and 2 CANBus onboard;
The data processing and communication capabilities are strong, the CAN driver is stable and reliable, and no frame loss occurs when the bus load is high;
1 way 10/100M Ethernet interface;
Direct support for LCD display, support resolution up to 1366 & TImes; 768, can be used for software UI and advertising;
Support large size touch screen;
Audio interface (supports audio output and microphone input);
SD card interface;
All components of the industrial control board are in line with the industrial grade -40~+85 °C requirements.
2. Key indicators
1, CAN stable communication
In the development of charging piles, the communication and information exchange between the CAN and the vehicle's battery system is the core function of the product, so it is crucial to not lose frames during this CAN communication process. The EPC-9200 adopts TI's AM3352 processor and integrates the CAN controller. The CAN controller's data packet hardware FIFO has 64 frames of data packet buffering capability, and there is no bottleneck in hardware communication. And the product's CAN drive, after years of experience in the CAN bus industry optimization design, can achieve the high load rate of the bus without losing frames!
2, video playback
The universal outdoor small advertising machine adopts a resolution of 720Ñ…576 or more, and the EPC-9200 industrial control board can support up to 1366Ñ…768 high-definition resolution display, which can meet the requirements of pictures and advertisement display on the charging pile.
3, consumer document printing
The printed data is mainly for consumption content, requiring miniaturization, fast printing speed, high reliability, and clear printing characters. The ZY-TP12 micro-player introduced by Guangzhou Zhou Ligong adopts line thermal technology, which has the above requirements, and uses serial RS-232 for communication, which is simple and powerful.
4, swipe to record transaction information
The user is charged by a non-contact IC card and is a basic function. Guangzhou Zhiyuan Electronics ZLG522S Series
Read-write card module, which conforms to ISO14443 standard, supports PLUS CPU, MIFARE Desfire (CPU card), MIFARE S50/S70, MIFARE 0 ultralight, MIFARE Pro. It is ultra-small, ultra-large-scale integrated circuit package, easy to use and reliable. The variety, size, and size make it easy and quick to incorporate today's most popular contactless IC card technology into your system to improve your product quality.
5, remote data transmission
In the charging station, the main data of the communication between the charging pile and the charging station monitoring center is the control and small data collection information. It is required that the real-time monitoring during the operation of the charging pile is relatively high, and measures can be taken in the first time in case of an unexpected situation. With the rapid development of charging stations, unmanned self-service charging stations will also become a trend. At this time, remote centralized monitoring and unexpected emergency are becoming more and more important, so the data transmission of "CAN+Ethernet" dual network redundancy is adopted. The way to ensure the safety and data of each charging pile of the power station is smooth and reliable.
Some charging stations will need wireless communication, and the transaction information will be transmitted to the service center remotely through the GPRS module. This kind of demand can be easily added on this solution. You can use Zhiyuan ZWG-28A GPRS communication module or other solutions!
6, environmental reliability test
According to the general requirements in the "Technical Specifications for Electric Vehicle Charging Systems", the working environment temperature of the charger is -20 ° C ~ 50 ° C, and has a certain seismic capacity. The EPC-9200 has passed the industrial four-level design standard and can work stably in the -40 ° C ~ 85 ° C environment. The EPC-9200 uses almost all of the chip components, and has excellent seismic performance, and all devices use industrial grade devices.
7, electromagnetic compatibility test
The electromagnetic sensitivity of the electronic equipment in the charging pile should conform to the GB 6833 series standard, and ZLG has its own independent electromagnetic compatibility testing laboratory. All industrial control products must pass the electromagnetic compatibility test in the research and development and production process.
8, support for remote application upgrades
The communication system adopts the Ethernet redundant transmission structure, and can be upgraded remotely through Ethernet when upgrading applications and systems.
Summary of the current charging pile still has several major pains:
Sore one: the quality of the charging pile itself is uneven
The charging piles born from new energy vehicles have developed rapidly in the past two years, and huge market space has attracted many companies to get involved. It was learned from the exhibition that there are currently more than 300 domestic charging pile production enterprises. Full market competition is a good thing, but product quality and industry standards are difficult to control.
Pain 2: Charging piles have waste of resources
In the interview, the reporter found that although the scale of charging pile construction is expanding and the number is growing, there are still some owners complaining that there is no place to charge. Due to imperfect charging standards in the previous period, some of the piles could not be effectively combined, and the charging pile could not be effectively utilized.
Sore three: profitability is difficult, charging piles encounter promotion problems
The related residential property department is also worried about charging pile installation problems. Liu Dong, head of a property department, revealed that because the site is difficult to find, there are only a few parking spaces in the community with charging piles. At the same time, because of the low usage rate of charging piles, these charging piles are not profitable, and the manufacturer has no one to maintain for a long time, and the property can only re-coordinate the installation of charging piles.
Sore four: charging facility policy is not sound
The charging infrastructure industry is still in the early stage of development, and the development of key technologies is changing with each passing day, which increases the difficulty of charging infrastructure construction and management. Some provinces and cities across the country have not yet issued special plans for the charging infrastructure and operational management measures. The verification of funds subsidies has not formed a complete verification process, and administrative resources are wasted, and it is difficult for charging operators to obtain subsidies. In terms of management, there is a lack of corresponding regulations and regulations on the safety of charging operations and the qualifications of operations, and the lack of supervision and management.
Pain 5: The charging piles in the third and fourth tier cities are difficult to promote and are composed of various reasons.
First of all, consumers in third- and fourth-tier cities have less subsidies for purchasing electric vehicles. Only state subsidies can be enjoyed. Local subsidies are not as strong as those in Beijing and Shanghai, which reduces the enthusiasm of consumers.
Second, electric vehicles are often the second car in the family. Consumers in third- and fourth-tier cities are still in the stage of popularization of the first car, and they are less sensitive to electric vehicles.
Third, electric vehicles in third- and fourth-tier cities are mainly low-speed electric vehicles. These electric vehicles use lead-acid batteries as the power source. These batteries do not support fast charging.
Fourth, charging electricity and service fees are charged. This is the most basic way of profit for most charging pile operators. However, the user base is too small, and the profitability in the first-tier cities is still difficult, let alone the third- and fourth-tier cities. Therefore, the construction of charging piles in third- and fourth-tier cities is not easy to promote in a short time.
to sum up:
The National Development and Reform Commission and other four departments issued the "Electric Vehicle Charging Infrastructure Development Guide (2015-2020) proposed that by 2020, more than 12,000 new centralized charging and replacement stations will be added, and more than 4.8 million decentralized charging piles will be distributed. To meet the charging needs of 5 million electric vehicles nationwide.
In general, the birth of new things is always accompanied by the emergence of various problems. It is a long process to break the original inherent production structure. In this mixed charging pile market, there is no rule, no need to formulate certain standards, establish a unified testing and certification mechanism, and improve the standardization system, so that the people of the whole country can safely drive on electric vehicles. A beautiful green life. (Comprehensive finishing)
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