According to the standard of General Technical Conditions for Electric Bicycles (GB 1776 1), the maximum speed of electric bicycles should not exceed 20km/h; The mass of the whole vehicle shall not exceed 40kg；; Have pedal driving ability, and the pedal driving distance of 30min minutes should be not less than 7 km; The continuous driving mileage after one charge is not less than 25km；; When riding at the highest speed (driving at the speed of 15- 18km/h with electric assistance), the noise should be no more than 62 db (a); 100km electric bicycle power consumption should not be greater than1.2 kw h; The rated continuous output power of the motor should be no more than 240 W；; When an electric bicycle is riding at the highest speed (20km/h speed assisted by electric power), the braking distance in dry state is not more than 4m, and the braking distance in wet state is not more than15 m.. The quality certification rate of electric bicycles is less than 2%.
At the China North International Bicycle Show held in Tianjin a few days ago, Gong Hao, the certification department of the National Quality Inspection Center, expressed concern about the uneven quality of electric bicycles. He revealed that only 1% to 2% of the total number of households have passed the CQC certification since the National Quality Inspection Center and China Quality Certification Center jointly carried out the CQC certification of electric bicycles in the second half of last year, among which Tianjin currently has zero certification.
It is understood that there are the following problems in the quality of electric bicycles on the market at present: the front fork is easy to break; The battery electrodes are not matched; Seriously overweight. The main reasons for this market chaos are: without production license, some enterprises rushed to launch; The large market demand leads to the survival of products of all grades; Immature consumers and dealers.
Two: brand of electric vehicles
1) The "Reputation Logo Brands" launched by China Bicycle Association in 2005 are (2 1):
Mainland pigeon, gazelle, He Qian, Elida, Bond, Ingley, Yongji, Benji, Fujita, Amigues, Phoenix, Giant, New Nadi, Jingxinri, Medefa, Ling Bao, Ba Pu, Jiebao Wang, Xiao Fei, Philip, Wolong.
(2) In 2004, the sales volume of electric vehicles in China was 15.
Giant, Maikete, Inklee, Aucma, Luyuan, Xinqier, Heping, Yida, Hongdu, Hongtian, Wolong, Changfeng, Millennium and Sendi.
(3) CCTV brand (12)
Yiling, Safran, Da 'an Monado, Daming, Bird Chaser, Moon Queen, Goya, King Jebel, Angel, Wind Instrument, Golden Heron, and Louida.
(4) There are other national famous brands (except the above examples).
Lv Jia, Hong Kong University Ben, Zongshen, Century Star, Sundiro, Chunlan, Lanbei, Fujita, Cage, Thunderbolt Leopard, Jialing, Xiaolan, Xifulai, City Hunter and Outong.
(5) Best-selling brands in Chengdu (15)
Urban Wind, Flying Pigeons, Qi Lei, Rose Covenant, Minstar, Beite, Yiling, Yongjiu, Supaqi, Beixinri, He Qian, Xiaofei Ge, Libahuang, Giant and Jialing.
I think the sales volume is more reliable, and the market can explain many problems. Now many certifications and "* * * brands" are bought by Mi Gu, but I don't know whether the sales announced by the association are accurate.
Three: the core technical concept of electric bicycle
What is an "electric bicycle"? According to the national standard GB17761-1999, "an electric bicycle is a special bicycle that can be driven by manpower, electricity or electricity", and this definition is also included in the National Economic Industry Classification (GB/T 4754-2002) formulated by the National Bureau of Statistics. Similarly, this concept has been confirmed by the newly promulgated Road Traffic Safety Law of the People's Republic of China, which will be officially implemented on May 1 2004. Obviously, the electric bicycle is a personal means of transportation that can be ridden by electricity without losing the function of human riding.
Looking back at the core technical concept of electric bicycle, the most fundamental concept is "electric", that is, the concept of motor. Here, the motor can be compared to the engine in an automobile or motorcycle, and it is the executive component that converts electric energy into mechanical energy. An excellent electric bicycle must first have an excellent motor. What are the characteristics of an excellent motor? Good output characteristics and high efficiency in possible working areas; Good service life characteristics, reasonable coordination of all components in the motor, long service life and low maintenance cost; Good "maximum" characteristics, can provide greater effective working torque, suitable for heavy-duty work, etc.
Another important technical concept of electric bicycle is "battery", which is the energy storage component of electric bicycle, equivalent to the fuel tank of automobile or motorcycle. However, there is a difference between "battery" and "fuel tank". The storage capacity of the fuel tank is constant, and the storage capacity of the battery will change with the use time, use mode, environmental temperature, system coordination, charging state and other factors, and eventually tend to be "exhausted". Therefore, how to choose high-performance and large-capacity batteries and cooperate well in all aspects has become another key index to measure the technical level of electric bicycles.
What is a charger? Most people think that the charger is a simple product, and there are many chargers in ordinary household appliances. However, for electric vehicles, charger and charging technology are in a very critical position. In recent years, the development of electric vehicles has been carried out in depth around the world. One of the most important and difficult problems is "charging". Traditional cars can refuel in a few minutes, but who can safely charge electric cars in a few minutes? If not, the social application of electric vehicles will encounter obstacles. The charging technology of electric bicycle is relatively simple, so in recent years it has entered a misunderstanding that the charger and charging technology are not important, although a low-cost and low-tech charger is enough. The spread of this trend has led to large-scale damage of some brands of batteries, and many battery manufacturers have published articles accusing the chargers of their low quality tendency. They said, "The battery is not broken, but charged." This complaint is not unreasonable. For a professional electric vehicle manufacturer, the research on charging technology should be in a very important position. The charger is equivalent to an "automatic tanker", but the charging process is far more complicated than the "refueling process". An excellent charger has to solve a series of theoretical problems.