In the past, few truck drivers knew what a retarder was. However, with the formal implementation of the GB7258 standard, “dangerous goods transport vehicles and trucks with a total mass of more than 12 tons should be equipped with retarders or other auxiliary braking devices.†This rigid requirement has forced Chinese truck users to slowly accept and Gradually spread this auxiliary brake device. Then came new problems. Is it a choice of hydraulic retarder or eddy current retarder, which is more suitable for Chinese truck users? Xiaobian consulted industry experts on the above issues and compared the performance of the two products. The reaction speed eddy current retarder starts to act almost instantaneously and reaches 66% of the maximum torque within 120ms. The eddy current retarder brake reaction time is 20 times that of the hydraulic retarder. Impact on engine and emissions The eddy current retarder has no adverse effect on the engine and emissions. Because the hydraulic retarder transfers the heat generated during the braking process to the engine cooling system, it will cause the engine water temperature to be high, especially in the summer, its braking capacity will be greatly affected; the change of water temperature makes the engine run in the non-ideal area. The previously established model is no longer suitable for high water temperature conditions at this time, emissions may deteriorate, and the country's new emission standards may not be met. Because the torque eddy current retarder is an air-cooled heat sink, the braking force is about 3300Nm. The retarding torque of the hydraulic retarder is proportional to the 5th power of the effective diameter of the working chamber of the retarder, which is limited by the cooling capacity of the engine cooling system. The braking torque of the hydraulic retarder can reach a range of about 4000Nm. Better than eddy current retarder. The failure rate eddy current retarder uses Taylor Malo retarder as an example. Because it adopts imported materials, all control parts and cassettes use fuel-inhibiting materials and can withstand high temperatures of 220 degrees. Tyler eddy current retarder has passed the dynamic balance test and fatigue resistance test. It has high stability, 80 mechanical super durability tests, and the life of electrical components reaches 5 million times. Therefore, the eddy current retarder failure rate is less than five ten thousandths. Due to the connection of the hydraulic retarder to the engine, transmission and piping, there are many parts that are subject to failure, such as pipelines, engine wear, oil leakage, etc. Convenient installation The eddy current retarder is flexible in installation and has no influence on other parts and components. It can be installed in an automobile factory or installed by the end customer. It can be installed in the gearbox, transmission shaft and rear axle. The hydraulic retarder needs to share the cooling water circulation with the engine and shares the lubrication system with the transmission. The structural changes are more complicated and the installation is more complicated. Brake Torque Characteristics The eddy current retarder is less affected by the rotation speed. Take Tellomar retarder as an example, it can provide 80% of the maximum braking torque when the vehicle speed reaches 10km/h. The braking torque of a hydraulic retarder is proportional to the second power of the rotational speed of the moving wheel. Generally, for a tandem-mounted hydraulic retarder, when the rotational speed of the propeller shaft reaches 1000 rpm, the rear axle speed ratio is calculated as six. When the vehicle speed reaches about 30km/h, it can provide greater braking torque. Installation costs Install an eddy current retarder at about 12,000 yuan. International famous brands of hydraulic retarders, about 2-3 million / sets. It can be seen that compared with the hydraulic retarder, the eddy current retarder has a simple structure, a low production cost and a low selling price. Generally, the truck needs about 10,000 yuan for installation; the braking torque has a wide range of 300Nm to 3300Nm, suitable for all types of vehicles (4-45t); short response time (only 40ms, 20 times higher than hydraulic retarder), no significant time lag; low operating noise; vehicle running at low speed At the same time, large braking torque can also be generated; the magnitude of the braking torque can be adjusted by controlling the excitation current, which is easy to realize automatic control; It also has the advantages of low failure rate, convenient maintenance and high reliability. In addition, in China, trucks currently use manual transmissions. The eddy current retarder has a simple structure and is easily combined with a manual transmission. It is most suitable for eddy current retarders. Therefore, considering all factors, eddy current retarders may be more easily accepted in emerging markets such as China, and are more suitable for Chinese truck users.
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