Often listen to the driver friend say: run carriage of, drive age longer drive more careful, to the vehicle security also more value, do not matter actually drive age length, drive safety forever is the most important.
The driving routes of drivers and friends vary greatly, especially the steep and steep road conditions, which always test the response ability and braking performance of our drivers and friends.
Take the construction of highway network in China as an example, the maximum gradient of expressway is 3% in general, the maximum gradient of expressway in mountainous areas is 5%, and the design standard of national highway and other grade highway is gradually increased.
Take a 49T six-axle train for example, the higher the gradient, the higher the speed, and the higher the braking power required. For example, when driving at 60km/h, a 3% downhill requires about 200 horsepower, while a 5% downhill requires more than 440 HP of braking power to ensure a uniform downhill.
Therefore, such a large power demand requires a certain device to "digest and absorb". The foot brake is the most traditional way. However, with continuous use, the temperature of the brake drum keeps rising, which is easy to cause brake failure. The other way is auxiliary braking technology. Shaanxi automobile offers two mature options of in-cylinder braking and fasst hydraulic retarder, which is your best choice.
The braking power in the cylinder is related to the engine speed. The higher the speed, the higher the braking power will be. The maximum braking power will be close to 350 horsepower.
The FHB320B parallel hydraulic retarder matched by shaanxi automobile has a maximum braking torque of 3200N·M and a maximum braking power of more than 600 HP. The braking power is related to the speed. The higher the speed, the higher the braking power will be.
As it can be seen, a single in-cylinder brake or hydraulic retarder is capable of ordinary road conditions. Each of the two braking modes has its own advantages and disadvantages. The braking in the engine cylinder is mainly related to the engine speed. Therefore, low position and high speed are needed before downhill to exert the maximum braking effect. The performance of hydraulic retarder is related to speed and heat dissipation capacity of the vehicle. For a specific vehicle, it is only related to speed. The higher the speed, the better the braking effect.
Therefore, the use of in-cylinder braking and hydraulic retarder will form complementary advantages and complement each other. Taking the SHACMAN X3000 6x4 hazardous chemical transportation vehicle as an example, the actual braking capacity at different speeds is deduced as follows:
Thus, combination of the actual can achieve the braking power is less 300 horsepower, more than 700 horsepower, under the condition of without using the brakes, can deal with most of the working condition of the load transport, heavy duty truck mounted water spray device has not qualified, can save a water spray device and modification, adding water, such as brake pad replacement cost, don't slow down hill, improve transport efficiency, reduce the driver's mental workload.
However, the matching of the two braking modes in the industry is independent and simple, with poor handling and poor performance. Shan steam combined weichai, cummins, method and special high quality resources, from the vehicle matching, cooling system, electrical control aspects of analysis, development and demonstration, after 5 years of market validation, completed the shan steam uniquely combined brake control system, improve handling, maximizing the performance of the engine braking and auxiliary braking.
Shaanxi automobile auxiliary brake performance improvement and joint control technology