Do you really know how to drive a semi-trailer?

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Many people do not handle many small details properly in the process of driving a semi-trailer, and some of them are detrimental to the semi-trailer. To this end, Shanghai Trailer Heavy Industry has specially visited industry experts, selected three common misunderstandings of driving semi-trailers, and solved the problems for you without delay.

Professional semi-trailer training

The method of reversing a semi-trailer with automatic transmission should be “steady”

It is an extremely incorrect driving habit to adopt the “one D to the end” approach when driving an automatic transmission semi-trailer. Although it is an automatic transmission semi-trailer, it also has different types of functional gears, and it is necessary to adjust the “stable” gear to drive under different conditions. HELLN, director of the technical department of Shanghai Trailer Heavy Industry, said that some drivers, for the convenience of use, stop the semi-trailer after stepping on the semi-trailer for a short time, but do not shift the semi-trailer to the N gear, which is a bad way of using it for a long time. The consumption of brake semi-trailer disc and brake semi-trailer oil is very large. The suggestion given by HELLN on the gear change of the semi-trailer in the automatic transmission car semi-trailer is “When the semi-Trailer Vehicle is braked by the semi-trailer braking system and the semi-trailer speed is reduced to 0, the gear must be changed to the N gear. Secondly It is to choose the correct gear to drive steadily. If you want the semi-trailer to drive on the uphill or downhill road steadily, you need to change the gear to the climbing and downhill gears marked by L or 2. Such gears It will be more conducive to driving on the road and reduce the unnecessary consumption of engine power output.”

The rear view mirror is adjusted “accurately”

Rearview mirrors, semi-trailer owners look at them no less than a hundred times. But how to adjust the “accurate” rearview mirror so that the rearview mirror looks comfortable and is conducive to driving safety? Han Jianwei, the semitrailer referee of the China Automobile Federation National First Class Competition, said: “The adjustment of the central rearview mirror is ‘accurate’. , when adjusting the positions of the left and right mirrors, the left edge is just cut to the right ear of the image in the mirror, which means that under normal driving conditions, you cannot see yourself from the central rearview mirror, and The upper and lower positions are to place the distant horizon image in the center of the mirror. When dealing with the upper and lower positions of the left rearview mirror, place the distant horizon on the central horizontal line, and adjust the left and right sight positions to your desired position. The image of the left semi-trailer body that you see occupies 1/4 of the scope of the mirror surface.

Because the driver’s seat is located on the left side, it is not easy for the driver to grasp the situation on the right side of the semi-trailer. In addition, sometimes the semi-trailer needs to be parked on the roadside. When adjusting the upper and lower positions of the right side mirror, the ground area should be kept. If it is larger, the image in the rearview mirror occupies 2/3 of the mirror surface area. As for the left and right positions, it can also be adjusted so that the semi-trailer body image occupies 1/4 of the mirror surface area.”

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Coasting is not fuel efficient and damages the semi-trailer

Many drivers believe that coasting forward without the accelerator will save fuel. In fact, this kind of driving method not only saves a lot of fuel money, but also easily damages the semi-trailer. Here we especially want to interpret the sliding wear of the automatic transmission front-drive semi-trailer. When the automatic transmission front-drive semi-trailer is coasting in N gear, the torque converter starts to work after the engine is started, but the hydraulic coupling force is very small. The oil pump in the gearbox also starts to work, and the gearbox oil begins to enter the lubricating and ready state. At this time, the gearbox oil is in the empty cycle and waiting for the gear command, and the drive wheel can rotate freely. That is to say, when the driver switches to neutral while driving, the transmission does not supply oil, so the work without oil will accelerate the wear of the transmission and transmission gears, and this driving method “ruthlessly” wastes the semi-trailer. According to a simple calculation method, with 80 km/h as the sliding speed, the distance of neutral sliding is longer than that of sliding with gears, but the wear of the gearbox is higher than that of normal driving with gears, and the wear rate is more than 16% according to simple calculation. This kind of fuel-saving method is recommended for semitrailer owners not to use it.