According to the Ministry of Public Security website, in 2008, a total of 265,204 road traffic accidents occurred in the country, causing 73,484 deaths and 304,919 injuries. The direct property loss was 1.01 billion yuan. Compared with 2007, the number of accidents decreased by 62005, a decrease of 19%; the number of deaths decreased by 8165, a decrease of 10%; the number of injuries decreased by 75,523, a decrease of 20%; direct property losses decreased by 190 million yuan, a decrease of 15.8%. The comparison seems to be gratifying that the above-mentioned vicious indicators are all falling sharply, but some hidden dangers are also rising. According to statistics from the domestic industry, large trucks are becoming the vehicles with the highest increase in the number of traffic accident deaths in China and the largest economic losses in recent years. Species.
Hot weather affects braking performance
Especially during the hot summer season, brake shoes and wheels are affected by high temperatures. After frequent braking, the braking force drops rapidly. For example, if a car is driven in a mountainous area with steep slopes, sharp ridges, narrow roads, and complicated conditions, the number of brakes used will increase, and the brake lining temperature will increase sharply, making the braking performance even worse. In addition, due to the gradual deformation of the oil-slag road surface at high temperatures, some places may also become liquid, the adhesion of the road surface will be reduced, and the braking effect will be significantly worsened.
In this context, on the one hand, the driver must always establish a sense of safe driving; in addition, he must also comprehensively improve the safety performance of heavy trucks, and cooperate with the state to issue relevant heavy truck manufacturing standards as soon as possible, and regulate brake technology and performance. Fundamentally reduce the potential safety hazards and economic losses caused by the poor performance of the brake system, and keep away from the “safety door†of the truck.
Comprehensive improvement of braking performance requires starting from the source of the engine
The traditional understanding of vehicle driving safety is mostly limited to the braking system. This is far from enough. The performance of tires and other components also affects the safety of the vehicle at all times, especially as the core of the vehicle and the source of power. The engine also ensures the safety of driving. It plays an important role.
At present, most commercial vehicles in China are equipped with conventional exhaust-assisted braking devices. The working principle is to use a butterfly valve switch to close the exhaust pipe channel, so that the piston is subjected to gas back pressure during the exhaust stroke, preventing The engine is operated to generate a braking effect, achieving the purpose of controlling the speed of the vehicle. Due to the relatively backward technology, for heavy-duty vehicles, due to high kinetic energy, when the truck is driving on long-distance slopes, the temperature of the brakes is also relatively high, usually reaching 500-600°C or even higher. In this case, the friction coefficient of the brake is relatively reduced, and the situation of brake failure is prone to occur, resulting in major traffic accidents such as overturning and rear-end collision.
Engine exhaust valve brake system is an international standard
In countries with high requirements for vehicle safety, engine exhaust valve braking technology has become the standard for heavy-duty vehicles and is a mandatory device for regulations. In China, Weichai Power has developed a patented technology called WEVB in terms of safety performance since 2006. This technology is Weichai Power's introduction of advanced international EVB (exhaust valve braking system) technology and improved and innovatively applied to Weichai Power's engine products, WEVB system has obtained national patent protection.
According to Wei Hongling, an engineer at Weichai Power Technology Center, the WEVB system can further increase the braking efficiency of the engine. Its main function is to increase the braking torque generated by the diesel engine when the truck needs to decelerate, so that the vehicle can continuously decelerate or stabilize the vehicle speed, effectively improve the control performance of the vehicle, and can ensure the safety of the vehicle in the mountain downhill, and reduce the brake system. The frequency of use reduces the wear of the brake system and prolongs the replacement period of the brake shoe. In addition, using the WEVB system in the event of an emergency in the event of rain or ice and snow can prevent the vehicle from sliding sideways due to rapid deceleration. The traditional exhaust-assisted brake device is not as effective as the WEVB system due to the different working principle of the WEVB system. The improvement of the braking effect of the WEVB system can reach 40%-50%.
It is understood that WEVB exhaust valve braking system has been approved by the majority of heavy truck users with good performance. At present, the mainstream mainstream heavy truck brands such as Shaanxi Auto Heavy Truck and Futian Auman have adopted this technology to improve vehicle safety.
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