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.
Brake and braking technology lags behind and increases the probability of accidents in relatively imperfect road systems in China. At present, there are still more than 1.2 million kilometers of highways in the fourth- and fourth-level highways in China, accounting for about 70% of the total traffic mileage of 1.83 million kilometers. In addition, due to various terrain conditions, the road conditions in China are also more complicated. In western and southwestern regions, mountains and mountains are relatively steep. The roads in these areas are often built upside down. Sharp bends, steep slopes, continuous downhill slopes, and downhill slopes are common. These sections are often accident-prone areas. Heavy truck transport is often accompanied by the occurrence of overload conditions, which also lays a hidden danger for brake failure.
Against this background, if you want to effectively solve the traffic accidents and economic losses caused by large trucks, it is obviously necessary for the country to issue relevant heavy truck manufacturing standards as soon as possible, and the standards must necessarily cover the technical requirements of the brake system. This is because it is a key link for the safety of the truck and the driver’s personal safety.
Behind the accident, the truck brake system needs to be improved
According to expert analysis, the root cause of a large number of major truck accidents is that the vehicle does not use advanced braking systems during long-distance downhill slopes. When an emergency occurs, the brakes overheat and fail to operate due to the brakes being applied for too long. A series of accidents such as rear-end rear-end chasing and car-turning mountains.
The key to the truck accident is the problem of brake failure. From the principle of braking, the brakes convert the kinetic energy of the vehicle into heat during braking. In general, brakes have three main performance indicators.
One is the braking performance, that is, the ability to brake within a short distance; the other is the stability of the braking, which is the ability of the vehicle to control the direction of the braking process. Whether the vehicle will slide or deviate during the braking process depends on the stability of the brakes; the third one is the thermal recession, which can also be called the constant of the braking performance. He believes that the main reason for the failure of brakes on long-distance slopes is that the thermal decay of the brakes cannot meet the requirements.
For heavy-duty vehicles, due to high kinetic energy, the brake temperature during long-distance downhill sections is also relatively high, usually reaching 500-600°C or even higher. In this case, the friction coefficient of the brake is relatively reduced, sometimes the driver overloads for multi-pulling, which increases the probability of the vehicle experiencing a brake failure. It can be seen that the advanced and reliable braking system is the key link and strong guarantee for trucks to stay away from “safety doorsâ€. Domestic trucks urgently need to improve and improve their own braking technology systems.
Engine Brake Technology First Compression Release Brake System
The brake system of the vehicle is divided into three major blocks: service brake, parking brake, and engine brake. Among them, the service brakes and parking brakes are directly involved in the brake system of the vehicle and are two essential brake systems. On the basis of this, the engine brake system provides indirectly the overall safety of the vehicle. Another reliable guarantee.
Compression release braking system uses an engine compression brake to convert a diesel engine that generates kinetic energy into an air compressor that absorbs kinetic energy, thereby implementing an auxiliary braking function. When the driver releases the accelerator pedal, the forward kinetic energy of the truck continues to drive the system and the engine. The piston also continues to move up and down, and the intake air is compressed and expanded in the cylinder. Once engine braking is initiated, the engine brake will open the exhaust valve near the end of the compression stroke and exhaust the highly compressed air through the exhaust system. The energy returned to the piston is minimal, and as the cycle repeats, the forward kinetic energy of the truck is dissipated and the truck gradually decelerates. At present, the brake system of the Cummins engine in the United States is entirely provided by this technology, and it occupies a large proportion in the field of truck braking.
The characteristics and benefits of the compression-release brake system are as follows: Optimized performance design provides maximum retarding power; Compatible with engine and vehicle control systems; Gearbox, ABS, Cruise, Stabilizer, Anticollision, anti-turnover devices; Faster, more stable, more efficient braking performance; reduced engine, tire, wheel brake pad wear; reduced vehicle maintenance costs; reduced downtime; Thousands of miles of miles have proven road experience and the user’s full trust in this technology.
Cummins ISM 11-liter engine brake system safe and efficient three-dimensional savings
Cummins Engine Braking System is the most widely used and most mature engine braking system in the world. It is the engine brake technology of choice for 70% of well-known heavy truck brands. It uses a compression-release braking system, which uses a compression energy release device to convert the output power of the engine into an absorption-powered air compressor, which provides several times better braking performance than similar products.
This brake is maintenance-free and only increases the height of the engine by 66mm. The installation is flexible;
The driver only operates with two switches in the cab, which is very convenient;
Braking power up to 326 horsepower, significantly reducing vehicle braking distance, high braking efficiency and ensuring safety;
The engine stops supplying fuel when starting, saving fuel and environmental protection;
Effectively reduce the wear of tires and brake pads, saving maintenance costs;
Significantly increase the control of the downhill speed of the vehicle and improve the transportation efficiency.