Huawei’s Yu Chengdong angrily criticized the car expert, what’s so tricky about the “cheating” winter test?

The price of this winter test is really shocking. Relatively speaking, DxO in the mobile phone industry is simply playing house.

In the early hours of this morning, the blogger @小 garlic sprouts posted a screenshot of commercial cooperation rights suspected of understanding the car emperor’s winter test. The picture shows that the winter test resource package of Know Car Emperor is divided into 3 versions. Due to different cooperation rights, the price is also divided into three levels: 6 million, 10 million, and 16 million.

However, just a few hours ago, in response to doubts, Dongchedi also issued an article emphasizing that all items in Dongchedi’s winter test use unified testing standards, which are in line with users’ car use scenarios in extremely cold environments in winter, and there is no differential treatment.

In order to self-certify, Automobile Di also plans to hold the "2023 Winter Testing Open Day" in Mohe at 9 a.m. on December 14, inviting 39 brands including AITO Wenjie and Great Wall Haval to conduct on-site observations. Live broadcast.

Knowing that the car emperor is so aggressive, it is thanks to Huawei's Yu Chengdong.

A "cheating" test?

What is the biggest threat to the battery life of electric vehicles? It's the temperature. Because of this, the annual summer and winter tests of Dingchedi attract much attention. But this time, the publicity they gained seems to be a bit too much.

The test results of Dianchedi show that about 20 models participated in this year's winter test. Among them, the U8 ranks first among hybrid models with a pure electric range attainment rate of 85.08%. The pure electric range of this model under the WLTC standard is 124 kilometers, and the actual range is 105.5 kilometers.

The second place is BYD Song PLUS DM-i, with a battery life achievement rate of 63.80%; the third place is Ideal L7, with the achievement rate falling to 51.26%. The performance of the other models is average, with battery life achievement rates below 50%.

As for the last place, it is the brand new M7 that "created miracles and sold 7,000 a day" during the National Day. The battery life achievement rate is only 31.60%. Seeing such results for his own model, Yu Chengdong was on pins and needles. He posted a complaint on WeChat Moments late at night, calling it a "cheating test"!

Science and rigor are the basic rules that should be followed!

In addition to the Wenjie M7, Geely Automobile's Lynk & Co 08 EM-P and Galaxy L6 also achieved poor results, occupying the bottom three together with the Wenjie M7. In this regard, Geely Group Vice President Yang Xueliang, who is often active on Weibo, naturally has something to say.

I also disagree with the evaluation results of the pure electric range achievement rate of hybrid models in the "2023 Dongchedi Winter Test" released by Dongchedi. I also believe that the evaluation process is unscientific and unrigorous, and the conclusions are unconvincing, which not only misleads consumers, but also damages the credibility of itself.

In the face of doubts from the outside world, Know Chedi announced their testing process.

The test is divided into two stages: "preparation" and "testing". First, all vehicles are filled with fuel and fully charged the day before the test, and then left to stand overnight in a -20°C environment.

In the early morning of the next day, all test vehicles were unlocked at the same time, powered on uniformly, and began unified maintenance that lasted about one hour. The main preparation contents are:

  • Record relevant information
  • Set up shooting equipment and test equipment such as V-Box
  • Adjust settings such as driving mode and air conditioning temperature and start shooting

When testing pure electric battery life, the vehicle will drive in pure electric mode, use the most economical driving mode of the test vehicle, set the battery life to the lowest, adjust the kinetic energy recovery to the strongest mode, and adjust the air conditioner to 24°C automatic mode.

In addition, the car expert also said that if the temperature inside the car "exceeds the comfort range" during the test, the air conditioner can be manually intervened by ±1-2°C, and if the temperature inside the car is lower than 10°C, it will exceed the human body's tolerance range. , recorded as exiting the test.

Another signal to end the test came from the engine. Once the engine is started while driving, the pure electric endurance test ends – this is a seemingly reasonable setting, but it has major loopholes.

Gu Yukun, executive deputy general manager of the tank brand, said that vehicle data showed that the tank 400 Hi4-T participating in the test had a throttle depth of 84% when the battery power remained at 29.2%. In order to provide matching power, the engine intervened at this time, triggering the so-called "Test termination condition". Therefore, the 29.2% remaining power at the end of the test was not included in the overall test results.

This foot of the accelerator crushed the tank's pure electric battery life. It's no wonder that their leader couldn't sit still.

Tail lights on the snowy slope

Gu Yukun complained not only about the accelerator, but also about the brake.

The winter test of car experts is naturally not just about battery life, but power is also part of the test. Their test method is: climbing hills in the snow.

In this link, the driving behavior of the Tank 400 Hi4-T and the Fang Leopard 5 of the same group was inconsistent:

  1. Tank 400 Hi4-T has a loose throttle phenomenon during the acceleration phase. The vehicle speed drops from 45km/h to 35km/h, and then climbs with full throttle;
  2. Before reaching the top of the slope, the Tank 400 Hi-4T did not reach the limit like the Leopard 5. Instead, the brake operation occurred when the ESP system was normal and the torque was 5400N·m.

The brake light of Tank 400 Hi-4T lights up on the slope

Another Great Wall model participating in this round of winter testing had a different problem.

It has been previously clarified that the vehicles participating in the test had more than 50% remaining power before the test started. However, Great Wall Motor's backend data showed that the Wei brand Lanshan participating in the test had only 23% power when the test started, which affected the battery output power.

As we all know, the output power of plug-in hybrid models is different when the power is low and when the power is rich. In a state of power loss, the engine not only directly drives the wheels, but also charges the battery, losing part of the power. At the same time, a weak battery also directly leads to the loss of motor output power.

In addition, Great Wall Motors also said that the last part of this winter test was also unreasonable.

According to Chedi’s plan, after the power loss test, all test vehicles will be filled up again at the same gas station, and then the fuel consumption will be calculated. But the problem is that it is impossible for 20 vehicles to refuel at the same time, and there are not so many oil guns at a gas station. During the process of queuing for refueling, the vehicles did not stall, but remained idling.

Great Wall Motors stated that during this process, some models idled for 34 minutes and consumed about 0.72L of fuel. As for whether this part of the fuel consumption will be offset in the final score, Dingchedi did not give a clear reply. Not only that, long idle waiting also affects the average vehicle speed, which in turn affects the test results.

If the process is not rigorous, what reference will the test results have?

Great Wall wrote this in the announcement:

We call on and will make every effort to promote China's automobile industry regulatory agencies, car companies, evaluation institutions, media and users to work together to formulate new energy testing standards that are more in line with users' actual application scenarios, actual environmental conditions, and actual working conditions.

If the summer and winter tests are to be carried out, a set of scientific and rigorous test specifications is essential.

After taking the ice cream, remember to close the refrigerator

In the view of Geely Yang Xueliang, the "unscientific" and "unrigorous" winter testing of the Car Emperor has already occurred during the preparation stage.

Preparation before the start of the test is an important step to ensure the fairness and accuracy of the test. Great Wall Motors said that they also need about an hour of preparation time before doing pure electric range testing, but they do not use high-voltage electricity during preparation and consume very little power. During the preparation process, the car owner not only turned on high-voltage electricity, but also turned on the air conditioner.

The problem started as soon as the air conditioner was turned on.

In low-temperature environments, new energy vehicles cannot use engine waste heat to heat the cabin like traditional fuel vehicles. They can only consume the power in the battery to bring warmth to the people in the vehicle. On the other hand, due to electrochemical characteristics, the efficiency of lithium-ion batteries will be greatly reduced in low temperature environments.

More importantly, the car-savvy emperor kept the doors and windows open for a long time during the preparation process.

According to information disclosed by AITO Auto, the Wenjie M7 had an air-conditioning and heating process for 71 minutes, opened and closed the door more than ten times before the test started, and the longest time reached 3 minutes.

Geely Yang Xueliang also said that the Geely Galaxy L6 idled in place for 70 minutes before the test, during which the door was opened 4 times, and the longest two door openings lasted more than 10 minutes; the Lynk & Co 08 also idled in place for 71 minutes before the test, during which the door was opened 6 times. times, and the longest opening time was 6 minutes and 39 seconds.

The preparation time before the test of the Tank 400 Hi4-T also reached 72 minutes. During this period, the door was opened and closed more than ten times, with a total time of about 13 minutes. The total air conditioner was 6.1 points, so the battery life under test conditions was 12.8km – approximately This is 12.2% of the vehicle’s operating mileage.

Turning on the heater without closing the door in the middle of winter is like taking out ice cream without closing the refrigerator. It's an act of "beating your mother when you see her".

All I can say is that for the live broadcast on the morning of the 14th, remember to close the door.

Anyone with wheels is interested and welcome to communicate. Email: [email protected]

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