1: What are the main performances and parameters of electric bicycles?

According to the "General Technical Conditions for Electric Bicycles" (GB17761), the maximum speed of an electric bicycle should not be greater than 20km/h; the mass of the entire vehicle should not be greater than 40kg; it should have the ability to pedal, and a 30-minute pedal cycle The driving distance should not be less than 7km; the continuation mileage after a single charge should not be less than 25km; the noise when riding at the highest speed for electric constant speed (15-18km/h when electric-assisted) should not be greater than 62dB ( A); The electric energy consumption of 100km of electric riding should not be greater than 1.2kW.h; the rated continuous output power of the motor should not be greater than 240W; when electric riding at the highest speed (electrically assisted riding at a speed of 20km/h), the The dry braking distance should not be greater than 4m, and the wet braking distance should not be greater than 15m. The quality certification rate of electric bicycles is less than 2%

At the North China International Bicycle Show held in Tianjin a few days ago, Gong Hao, the Certification Department of the National Quality Inspection Center, was worried about the current uneven quality of electric bicycles. He revealed that since the National Quality Inspection Center and the China Quality Certification Center jointly launched the CQC certification for electric bicycle quality in the second half of last year, the number of electric bicycle companies that have passed the certification only accounts for 1% to 2% of the total number of households, of which Tianjin currently has zero certification.

It is understood that the quality of electric bicycles currently on the market has the following problems: the front fork is prone to breakage; the battery electrodes do not match; and the weight is seriously excessive. The main reasons for the chaos in this market are: there is no production license, and some companies have launched hastily; the market demand is large, resulting in the survival of various grades of products; consumers and dealers are immature, etc.

Two: Electric Vehicle Brands

1) The 2005 "Credit Logo Brands" launched by the China Bicycle Association include (21):

Continental Pigeon, Xiao Antelope, Qianhe, Elaida, Bond, Inclair, Forever, Penji, Fujitec, Amini, Phoenix, Giant, New Naidi, Beijing Xinri, Mai Defa, Baoling, Biaopai, Jie King Bao, Brother Xiaofei, Philip, and Wolong.

(2) The top 15 electric vehicle sales companies in the country in 2004

Giant, McCote, Inclair, Continental Pigeon, Aucma, Luyuan, Xinqier, Heping, and Yi Laida, Hongdu, Hongtian, Wolong, Changfeng, Qianqian and Sendi.

(3) Brands on the CCTV list (12)

Yiling, Safran, Daan Monado, Daming, Chasing Bird, Queen of Stars and Moon, Ya Gedi, King Jiebao, Angel, Fengyi, Jinlu, Luida.

(4) There are also some well-known national brands (except the above examples)

Green Good, Hong Kong Daben, Zongshen, Century Star, New Continent, Chunlan, Lanbei, Fuji Da, Kaiqi, Thunder Leopard, Jialing, Xiaolan, Xifulai, City Hunter, Outong.

(5) Best-selling brands in Chengdu (15)

Urban style, Feige, Qilei, Rose Date, Minsida, Beite, Yiling, Forever, Superpack, Beijing Xinri, Qianhe, Xiaofei Ge, Libahuang, Giant, Jialing.

I think the sales volume is more reliable. The market can explain a lot of problems. Nowadays, many certifications and "*** brands" are bought by Mimi. I just don't know whether the sales volume announced by the association is accurate.

Three: The core technical concept of electric bicycles

What is an "electric bicycle"? According to the description of the national standard GB17761-1999: "An electric bicycle is a special bicycle that uses batteries as auxiliary energy, has two wheels, and can realize human riding, electric or electric-assisted riding." This definition has also been included in the national National Economic Industry Classification (GB/T4754-2002) formulated by the Bureau of Statistics (2002 version). Similarly, this concept has also been confirmed by the newly promulgated and officially implemented "Road Traffic Safety Law of the People's Republic of China" on May 1, 2004. Obviously, an electric bicycle is a kind of personal transportation that can rely on electricity to ride without losing the function of human riding.

Looking back at the core technical concepts of electric bicycles, the most fundamental concept is the concept of "electricity", which is the concept of a motor. Here, a motor can be compared to an engine in a car or motorcycle, which is a device that converts electrical energy into As an execution component that converts mechanical 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, high efficiency can be maintained in possible working areas; good life characteristics, the various parts in the motor cooperate reasonably, long service life, low maintenance costs; good "maximum value" characteristics , can provide larger effective working torque, suitable for large load work, etc.

Another important technical concept of electric bicycles is "battery". "Battery" is the energy storage component of electric bicycles, which is equivalent to the fuel tank of a car or motorcycle, but there is a difference between "battery" and "fuel tank" Yes, the fuel storage capacity of the fuel tank is constant, while the battery storage capacity will change with factors such as usage time, usage method, ambient temperature, system coordination, charging status, etc., and will eventually become "exhausted", which requires Replace the battery. Therefore, how to choose high-performance and large-capacity batteries and coordinate all aspects of the process has become another key indicator to measure the technical level of electric bicycles.

What is a charger? Most people think of a charger as a simple product, and chargers are everywhere in ordinary electrical appliances. However, for electric vehicles, chargers and charging technology are in a very critical position. In recent years, the development of electric vehicles has been carried out globally. Among them, the most important and difficult problem is the "charging" problem. It only takes a few minutes to refuel a traditional car, but who can charge an electric car in a few minutes? What about completing safe charging? If not, the social application of electric vehicles will encounter obstacles. The charging technology of electric bicycles is relatively simple. Therefore, in recent years, there has been a misunderstanding that chargers and charging technology are not important, even though it is enough to use low-cost, low-tech chargers. The spread of this trend has led to Some brands have experienced large-scale battery damage. Many battery manufacturers have published articles criticizing the low-quality tendencies of chargers. They say: "Battery is not worn out, but charged bad." This complaint is not unreasonable. . For a professional electric vehicle manufacturing company, the research on charging technology should be in a very important position. The charger is equivalent to an "automatic refueling machine", but the charging process is far more complicated than the "refueling process". An excellent charger must solve A series of theoretical issues,