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Recently, a similar report on "Forcing a retarder to be installed on a truck with more than 12 tons" has appeared in the media of major commercial vehicle industries, which has aroused the concern of relevant practitioners. After investigation, it was discovered that: 12 tons or more trucks will forcibly install slow retarders. The Wenwen reporter misreads them. The future policy will not require the mandatory installation of retarders for trucks over 12 tons.
Retarders are only one of the auxiliary brake devices
View the resolution of the new standard setting seminar for GB7258 “Safety conditions for the operation of motor vehicles†held in Beijing on March 30, 2011. The original words related to the mandatory installation are: trucks with more than 12 tons and dangerous goods vehicles will be forced Install retarder or other auxiliary brake device.
Here, the original words use "or", which indicates that the retarder is not the only required auxiliary brake device. Therefore, from this meeting, it is concluded that "the truck with more than 12 tons will force the installation of a retarder."
Currently serves as a member of the National Automobile Standardization Technical Committee, Deputy Chairman of the National Automobile Standardization Technical Committee Chassis Subcommittee, Member of the National Automobile Standardization Technical Committee Vehicle Sub-Committee, Member of the National Automobile Standardization Technical Committee Energy Saving Sub-Committee, and the 4th "China Automotive Industry Experts of the Jury of the Jury Committee of the Science and Technology Awards, Experts of the China Association of Automobile Manufacturers Expert Committee, and Tan Huiqing, a recall expert from the General Administration of Quality Supervision, Inspection and Quarantine, who are participants and drafters of many automobile standards in China, believe that the development of national automobile standards is generally only The performance of the car will be required without any specific device.
The expert explained this: The retarder is only one of the devices that achieve the braking effect. Whether or not the automobile manufacturer adopts this device is entirely due to the company’s own choice. As long as the performance of the car finally meets the requirements of the state, the specific technical route and means of realization lie in the enterprise itself. Moreover, technology is also continuously improving, and what kind of implementation method is adopted is constantly changing. This is just like the emission requirements of automobiles. It will only require the final emission standards. As for what technology path to use and what emission equipment to use, the national standard will not be specified. To be more extreme, the national standards will not even require your car to be made of iron or wood, whether to use wheels or wheels. As long as your car can meet the national standards for acceleration, braking, collision safety, etc. Yes.
Eddy current retarder is a foreign product
Experts in related fields also stated that, first of all, the state will not force the use of retarders; secondly, eddy current retarders, which are more common in China, are already the basic type of retarder in Europe.
Two famous European retarder suppliers, ZF and VOITH, have confirmed that the hydraulic retarder is the main retarder of commercial vehicles in Europe, and a large number of ZF retarder assemblies. On European trucks and buses, these retarders are all hydraulic retarders. The eddy-current retarder consumes a lot of electricity, is very heavy and requires a lot of installation space. Therefore, ZF retarders are all hydraulic.
The use of eddy current retarders does not necessarily provide a significant improvement in safety, which is an important reason for the large number of European vehicles discarding eddy current retarders. Most of the buses in Europe are equipped with Voith retarders. Moreover, many retarders are installed directly in the gearbox and no separate retarder is installed.
All of Voith's use of hydraulic retarders is due to the fact that the hydraulic retarder does not suffer from excessively high weight and power consumption of the eddy current retarder. In addition, many of Voith's retarders are indeed installed in gearboxes and do not require a separate retarder. At present, 200,000 passenger vehicles worldwide are driven by Voith automatic transmissions (including hydraulic retarders), 600,000 heavy commercial vehicles use Voith retarder, Voith retarder is Mercedes-Benz, etc. European standard equipment for high-end passenger cars.
Hydraulic retarder prices are higher
The eddy current retarder has so many shortcomings, why is it now the mainstream form of retarder? One reason is that the technical requirements of hydraulic retarders are high and there are fewer domestic manufacturers that can produce them; another, more important reason, is that the price of hydraulic retarders is too high. For many Chinese trucks, even eddy current retarders are difficult to bear, let alone higher-priced hydraulic retarders.
For the country, it is necessary to gradually improve the vehicle's performance standards, including braking performance. This is also a requirement to ensure the safety of people's lives and property. However, what kind of approach companies use to meet national standards is determined by the level of economic development, the production level of parts and components companies, and the affordability of customers. However, it is certain that competition will allow vehicle manufacturers and parts and components companies to provide better and better products. With the increase in the assembly of these products, prices will also drop.
As a national policy department, as long as the goals and directions are pointed out, market competition will allow companies to choose the best path to reach. In fact, the cars parked on the streets of Germany, France, Sweden, and other countries do not look very different from the Chinese street cars. However, the prices of commercial vehicles in these countries are far higher than those in the domestic market. Heavy trucks on the European highways are priced at more than 100,000 euros, buses are between 150,000 and 300,000 euros, and bus prices in many countries can reach 300,000 euros. This shows that the future direction of China's commercial vehicles will also be a gradual increase in price and performance. Therefore, improving vehicle braking performance and cost increase is an inevitable development path for commercial vehicles in China, but whether or not to choose a retarder and what kind of retarder to choose is determined by competition.
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