【Real-time】Insulation protection supplies help new energy vehicles

Recently, the four young men in the Hangzhou Automobile Advanced Technical School have been thundering. The news that they have made outstanding achievements in the National New Energy Vehicle Contest has spread all over the school and has a high rate of return on the road. The four young men started out in the game and played in the absence of experience. The fight was real technology. As a result, they returned to the two awards of the secondary vocational school and the higher vocational school in one breath.

Hard work for 2 months

Zero-based research into new energy models

The competition items are divided into two groups: higher vocational and secondary vocational. Each group has a team competition item, each of which includes three assessment subjects. The subjects are divided into theoretical knowledge and practical operation.

Chen Yujie and Zhang Lei of the Motor Class participated in the competition of the Central Vocational Training Group. After experiencing the BESTI new energy automobile basic knowledge test, replacement of the new energy vehicle power battery, and common fault diagnosis of the new energy vehicle control system, they won the test. First prize winner.

Pan Lei and Guo Sheng of the New Energy Auto Class attended the competition of the higher vocational education group. There were three rounds of difficulties in basic knowledge testing of BEST2 new energy vehicles, common fault diagnosis of new energy vehicle charging systems, and fault diagnosis of high-voltage systems for new energy vehicles. PK, won the second prize in the first place.

The excellent performance of both groups of horses has created the history of the school.

Wang Jun, a tutor, is a typical man and a man who is not good at talking. He seldom expresses his feelings in front of the students on weekdays. He can talk about this student winning the championship. His face can not help but bloom: "The last few games of actual competitions Minutes, the contest staff allowed us to enter the scene to watch the students. Among several groups of students who competed in the same field, I recognized Chen Yujie and Zhang Lei at a glance. They are very dedicated and their movements are smooth.”

One scene, Wang Jun, was very impressed. They had just entered. When Chen Yujie and Zhang Lei had begun to pick up the tool box, several other groups were still operating on the car body. "I saw that they were very calm and my heart was let down. There must be a play. Now, I think, these students are really not easy." Mr. Wang Jun recalled that when the initial contest was issued, the four students had no contact with the new. Energy cars did not even touch the car, and the training time was only a short period of two months. Students really put in full energy, soaked in the workshop every day, repeatedly fumbled for practice, only in exchange for this honor.

“In summer vacation, they wear heavy insulation clothes. The sweltering workshop stays for hours. The food is too busy to eat. The sweat can soak the hair. It’s really bitter. Now this is really their job. Deserve.” Wang Jun spoke highly of the proud students.

Nearly 1 hour compressed to 31 minutes

Challenge to replace more than 200 kilograms of battery

Looking back at the competition now, Zhang Lei’s initial feeling was a bit of a breakdown. This car maintenance master who won the award in both the Hangzhou Vocational Skills Competition and the Zhejiang Vocational Skills Competition did not even understand the structure of the new energy vehicle.

"Without an engine, pure electric vehicles rely on the motor controller mcu to control the operation of the entire vehicle system. This is a fundamental difference from the gasoline engine we used to operate on the engine." said Zhang Lei, he just got a new energy vehicle. The relevant information really does not understand. Chen Yujie is the younger brother of Xiao Zhanglei's first term. Personal strength is also the maintenance of petrol vehicles. In the face of new energy vehicles, it is also a bit blind. Fortunately, the autonomy of the two people is very strong. After the teacher's instructions, they quickly became familiar with the structure of new energy vehicles.

"The basic knowledge is better to master, the hardest thing is actual operation. The biggest difficulty in this competition is on replacing the power battery of new energy vehicles." Zhang Lei said that when light enters the workshop, there are a lot of things to notice, goggles. Safety helmets, insulating gloves, and insulating shoes are necessary, and more stress is placed on the insulation. When operating, the insulation blanket cannot be left under the soles of the feet. When the two cooperate, one main operation, one main guardianship, in case there is sudden The guardian protects the operator.

Chen Yujie said that the power-off treatment is the basic operation of replacing the battery, and then after the lift has been lifted to a suitable height, the car can be operated at the bottom of the car. "Open the shield, first to find 10 screws holding down the battery, unscrew them with an insulating tool, you can remove the battery, demolition is relatively simple, it can be difficult to install." Chen Yujie with reporters The whole battery is like a large piece of chocolate. It is thick and flat and has a weight of more than 200 kilograms. Therefore, it is technically necessary to reinstall it. However, if the position is wrong, the whole vehicle is jacked up. The car will roll over.

Zhang Lei said that the light under the car is usually very dark, and wearing goggles is prone to fogging. Every time they practice to this point, they will sweat. "We must first hold the battery near the installation position and send it up little by little until the positions of all 10 screws are fully aligned. Only then can we get it in accurately." Zhang Lei is the main operator. Several times in practice, it is a test of physical strength.

After the battery is installed, the rest of the work is easier. At first, because they are not familiar with the entire process, it takes nearly 1 hour for the two to replace a battery. This is a far cry from the 40-minute standard for the competition.

"Later, we took only 31 minutes to complete the formal competition. This is a secret. We mainly rely on cooperation. What do we do in each link? Even when we take any tools and plan ahead, this will save a lot. Time.” Zhang Lei said.

In two months, Zhang Lei and Chen Yujie lost seventy-eight pounds. They think that value!

New energy automotive talent shortage

The competition sharpens students' skills

As early as 2012, Hangzhou Steam Turbine took the lead in launching a new energy auto repair program. The first 38 graduates were already “completely robbed”. Pan Lei and Guo Sheng entered the competition this year. Although the two are new energy auto classes, but none of the current courses are related to new energy vehicles. This time they participated in the competition, they are also a zero-based start.

“I think the learning of new energy vehicles is still relatively difficult. Compared with gasoline vehicles, both the fault repair and the vehicle structure must be complicated, and there are many high-voltage wiring harnesses in the body, which are all similar in appearance and densely arranged. Very difficult to identify, need to judge from the multiple ways of color, signal, pin number.” Guo Sheng said that often a failure occurs, it will affect several lines, so learning needs to be patience. Before Pan Lei did not have any competition experience, he often found himself in a state of confusion when he prepared. “The instructor has helped me a lot and has often discussed with me and helped me build self-confidence.”

This kind of help continued into the competition. Pan Lei and Guo Sheng showed self-confidence in the game. "The final question of the game is the trickiest. The high-voltage system fault belongs to the first-class fault and cannot be driven or started. If the motor controller's high-voltage cable MCU is also insulative in the body, it is also broken, and it may pose a safety hazard to the owner, so it is accurate. The fault diagnosis is very important." Pan Lei said that in the end they depended on the analysis of the computer parameters and the observation of the line to the naked eye, and found the answer to this question under double analysis.

For the first time in the national competition, they achieved good results. The two were not satisfied. They all determined that they would participate in more national competitions in the future to hone their skills.

“Our school encourages students to participate in this competition. After all, the prospects for new energy vehicles are good. Now, the annual growth rate of new energy vehicles is much higher than that of gasoline vehicles. Once there is policy support, such as direct delivery in restricted cities. Licensing, but also free of tax, but also unlimited, and secondly, it is indeed very affordable for consumers, if the home owners of peaks and valleys, can complete the charge when the Valley, then converted to a kilometer less than 2 cents , And traditional gasoline vehicles, even if the minimum displacement of the model, one kilometer often have about 5 cents." Tutor Xu Jialu analysis, in the future, new energy vehicles will be more and more, this area of ​​senior talent will also become increasingly tight , And through the one after another national competition, the skills of students will be greatly enhanced.