【Truck Home Original】Seeing that it is about to enter November, and some time ago, the first snow of early winter fell in Changchun, Jilin Province, coupled with the fact that the minimum temperature in some provinces and cities in Shanxi and Shaanxi has broken through zero, these are also indicating that another year of "winter" has arrived. And whenever this point in time comes, there is a long-standing contradiction in the freight industry that is about to erupt.
This contradiction point refers to the friction between the vehicle water shower device and the auxiliary braking device, basically every winter there will be a card friends who have a very big controversy about the prohibition of the water shower device, thinking that if there is no water, what should the vehicle do when facing the long downhill section? Does auxiliary braking really work?
<h1 class="pgc-h-arrow-right" data-track="3" > more than one use of water to save lives, convenience, and money</h1>
The vehicle water shower device was first developed by which old driver, which is now unverifiable, but there is no doubt that the water shower has a decades-long development history in China. In the process of long descent, the vehicle only relies on the low gear to limit the speed increase and cannot meet the speed requirements in actual operation, so the brake system is required to cooperate.
However, due to the long downhill slope, coupled with the fact that the drum brake will be due to frequent braking and the braking force heat attenuation, it will make the braking force of the whole vehicle greatly reduced, which will lead to serious traffic accidents, at this time, it is necessary to reduce the temperature of the brake braking system through the water, so as to ensure that the vehicle has a good braking force, which is also the initial role of the water shower device.
Therefore, the water shower device has indeed saved many lives, which is the best proof that it has been used to this day. And with the development of the water shower device for many years, the smart freight transporter has also developed a lot of uses for the water shower device, there are external faucets for washing shabu, there are also air pressure water to wash the car, it can be said that the water shower device is also convenient for many card friends of the freight life.
Another point is that in the eyes of many card friends, the shower device is very economical, according to the card you said that the modification of a set of water shower device is about 1000-2000 yuan, each time adding water is basically about 30 yuan, if you add it twice a day, it is 600 yuan a month, which at first glance is still quite economical. But this is only on the surface, and card friends must not ignore the wear and replacement of tires and brake pads.
<h1 class="pgc-h-arrow-right" data-track="8" there are many forms of auxiliary braking > and it is more economical in the long run</h1>
Now the more common forms of auxiliary braking on the market are exhaust brakes, in-cylinder brakes and hydraulic retarders, let's first talk about exhaust braking, its working principle is to seal the exhaust port through a movable valve, so that the piston will be under pressure from the exhaust pipe when exhausting, to produce obstruction, reduce the role of the piston stroke, and then achieve the effect of reducing the engine speed.
Compared with the other two auxiliary brakes, the exhaust brake cost is the lowest, but its braking effect is also the worst, so the current domestic models equipped with scheduled brakes are mainly light load, standard load type light trucks.
The in-cylinder braking form can be divided into compression release brake and exhaust brake, at present, for the sake of braking efficiency and reliability considerations, the most used in domestic model engines is the compression release type in-cylinder brake form.
The operation process of the engine can be divided into four strokes of intake, compression, work and exhaust, after the use of compression release engine braking, the exhaust valve will be opened near the end of the compression stroke, so that the engine is constantly in the process of intake and compression, continuously consuming kinetic energy, and then achieving the purpose of vehicle braking.
About the hydraulic retarder believes that the card friends have already understood, the braking effect of the liquid slow is mainly achieved by the interaction between the rotor and the stator, the rotor and the transmission shaft are connected, the medium hydraulic oil (oil medium liquid slow) is controlled by the ECU to enter the working chamber when the liquid slow work, and the rotor connected to the drive shaft will continue to throw the oil to the stator, and the fixed stator will throw the oil out of the rotor and then throw it back to the rotor blade, in order to achieve the purpose of deceleration.
At the same time, JT/T1178.2 stipulates that newly produced tractor vehicles should be equipped with retarders or other auxiliary braking devices, which will be implemented from September 1, 2020. Coupled with the high reliability of compression-release cylinder brakes and relatively cheap prices, it is currently assembled on many models in China, after all, many models have original engines, and card friends are not sensitive to this part of the cost.
It is also because of the cost that the high price of the hydraulic retarder makes the card friends extremely sensitive to it, even if it has excellent braking performance, after all, the one-time expenditure of 20,000-30,000 yuan is indeed quite scary, so it has also become a configuration of a few high-end models. However, in the long run, having a complete set of auxiliary brake configurations will allow Kayou to save more money in long-term operation.
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In fact, from the perspective of driving safety, manufacturers and even the entire industry are very recommended that card friends provide vehicles with a full set of brake devices with in-cylinder brakes + liquid slowness, after all, their reliability and braking performance are still very excellent compared to traditional water showers, not to mention that some areas in winter are banning water shower devices.
Of course, some card friends will say that my car is not drenched, there is no auxiliary braking, in the face of driving brake safety, what should I do? Here are a few suggestions for card friends:
1, every time out of the car to have enough safety awareness, for the route to do a good job, before going downhill in advance to reduce gears and deceleration, and with the front car to maintain a safe distance.
2, to regularly check the vehicle braking system, so that early detection and early solution, must not hold a fluke mentality. After a long downhill period, you can stop for a while and use the time to lower the temperature of the brake pads.
3, remember not to overload transportation, especially in the case of a long downhill road conditions in front, the larger the vehicle load, the greater the inertia, the less likely it is to brake and slow down.
● Editor's postscript
Driving safety can not be ignored, although the water shower device has been used for many years, but now with a better, more advanced, safer braking device, we should also look forward, after all, modern technology will not develop backwards. (Text/Wang Chaopeng Photo/Truck Home)