The so-called EVB refers to engine exhaust braking technology. Currently, most truck manufacturers in China do not use EVB technology. However, from a safety perspective, EVB is a very important auxiliary braking for trucks. equipment.
According to this person, heavy trucks using EVB technology do not need to apply the brakes when going downhill. The engine exhaust system will automatically provide braking force to the car, absorbing a large amount of energy and converting it into resistance and releasing it. , thus increasing the braking force of the entire vehicle by 70%, which can effectively prevent brake failure. In developed countries in Europe and the United States, EVB has become a technology that is mandated for safety and is installed on every heavy-duty truck to ensure its safety during operation.
Liu Yi, Marketing Department of Weichai Power, said that Weichai Power spent a huge amount of money to exclusively buy out the patented heavy-duty truck safety braking technology - EVB technology from the German heavy-duty truck giant MAN Company, which was formed after digestion and absorption. The only WEVB plan in China. Starting in 2006, all heavy-duty truck engines produced by Weichai Power have been equipped with WEVB, so heavy-duty trucks from Shaanxi Heavy Duty Truck, Foton Motor, Hongyan Automobile, Northern Benz and other companies are currently equipped with this technology.
According to Liu Yi, the accident involving the Steyr heavy-duty van may have been caused by the failure to use WEVB. In March 2006, Weichai terminated its cooperation with China National Heavy Duty Truck Company, which used its own engines. However, the "5.4 accident" investigation department did not give the production date of the truck, so it was impossible to verify whether the truck used EVB technology. Guo Yu believes that from another perspective, even if the EVB auxiliary braking system is equipped, it may not be able to prevent this accident, because EVB is an auxiliary braking system after all.
In addition to EVB, auxiliary braking systems commonly used in heavy trucks also include anti-lock braking (ABS) and drive wheel anti-slip control (ASR) systems. Guo Yu believes that compared with the function of the auxiliary braking system, the fundamental difference in braking is whether the main braking system is drum type or disc type. The performance of disc brakes is much superior to that of drum type. However, many domestic heavy truck brands currently do not use disc brakes. In the final analysis, it is still a cost issue. At present, the dominant factor in purchasing heavy trucks in China is price. If the price rises, the corresponding sales volume will be affected. In order to ensure sales and market share, no manufacturer is willing to vigorously promote the value of its products in the name of safety. This situation has hindered the large-scale promotion of auxiliary safety systems.
Lagging braking technology increases the chance of accidents in China's relatively imperfect highway system. At present, there are still more than 1.2 million kilometers of domestic Class 4 and lower-grade highways, accounting for about 70% of the total 1.83 million kilometers of road mileage. In addition, China's road conditions are also complex due to diverse terrain conditions. Regions such as the west and southwest are mountainous and steep. The roads in these areas are often built around mountains. Sharp bends, steep slopes, continuous downhill slopes and long downhill slopes are common, and these road sections are often accident-prone areas. , Heavy truck transportation is often accompanied by overloading, which also creates hidden dangers for brake failure accidents.