Wen No. 7 - Song.
Recently, the company released a series of test results of the "2023 Winter Test", and the ranking of the pure electric range achievement rate of hybrid models will be fried as soon as it is released. The lowest mileage achievement rate of the test model was as low as 316%, which is equivalent to a bamboo shoot that has not been eaten, and most of it has become an old root.
This quickly caused dissatisfaction among many car companies, and questioned that the test standards of Chedi were not standardized and rigorous. Huawei's Yu Chengdong commented: "The test of pit people misleads the people!."Science and rigor are the basic rules that should be followed!”
Geely Yang Xueliang said: "I also disagree, I also think that the evaluation process is unscientific, not rigorous, and the conclusions are not convincing, which not only misleads consumers, but also hurts the credibility of Chedi itself." ”
Things quickly fermented, in order to prove that his test is credible, today (14th), held a winter test open day in Mohe at minus 40 degrees, and tested the plug-in hybrid extended range pure electric battery life again, and broadcast the whole process, some car companies, ** and user representatives were invited to the scene to experience supervision. Test data continues to surprise people.
Today we're not going to get into the merits, let's just talk about testing techniques.
Understand how Chedi does in winter
The range achievement rate test is ?
The winter mileage achievement rate test is divided into two stages: preparation and testing
(1) All vehicles are fully charged with fuel the day before the test, and then stand in the environment of -20 overnight, and then need to be prepared for one hour before the test the next day;
(2) During the formal test, the pure electric mode will be turned on when the air conditioner is turned on, and then the fuel consumption test will be filled with fuel.
There are two main doubts about this test:
(1) The preparation process is rough
The official said that the M7 was heated by the air conditioner for too long in the formal test and maintenance stage, and there were more than ten times of opening and closing the doors and windows in the process, which greatly increased the energy consumption of the air conditioner and led to a rapid decline in power. Great Wall Motors said that Great Wall Motors retrieved the background data of the tested models and found that some test results were abnormal.
Geely also found a similar situation, Galaxy L6 in the pre-test maintenance process, the vehicle idle in place for 70 minutes, during which the door was opened 4 times, and the longest two doors were opened for more than 10 minutes;The Lynk & Co 08 was idle in place for 71 minutes before the test, during which the doors were opened six times, with the longest opening time being 6 minutes and 39 seconds. These operations have greatly increased the energy consumption of the air conditioner, resulting in a significant drop in the vehicle's power before it is officially issued.
(2) The test method and final calculation are not rigorous
Great Wall said that after completing the fuel consumption test, the idle waiting time for refueling is different, and the fuel consumption is also different. VOYAH mentioned that the VOYAH FREE opened and closed the door for a long time during the test, in which the left front window was not closed for 306s and the right front window was not closed for 602s during driving.
In short, this time, as an evaluation agency, there are many unspeakable loopholes in the test, and it has been given an education by professional car manufacturers.
Understand that the Che Emperor made one
Professional third-party testing organization
Never make a mistake
As a test engineer, I have a deep understanding of the automotive testing process. In the eyes of many, automotive test specifications are logical and require extreme rigour. But in fact, there will be many unexpected situations in practice, even if it is procedural work, many times there are human omissions.
In order to strictly standardize the test, a professional third-party testing organization needs to have CMA CNAS certification.
CNAS accreditation has no restrictions on the legal status of the laboratory, which can be an in-house laboratory or an independent third-party laboratoryThe object of CMA laboratory qualification certification needs to be:Independent third-party labsLaboratories of public institutions under relevant departments, etc. These two will assess a series of contents such as laboratory equipment, personnel, test methods, and program documents to establish whether they are reasonable and compliant.
understands that Chedi, as a **, must not have these qualifications. Judging from Tianyancha, the business scope does not include automobile testing business.
To exaggerate, don't say whether the testers have on-the-job training, and they don't know whether the test instruments they install have a measurement and calibration certificate (such as the psychrometer in the picture below). This is also why there are voices on the Internet that understand Chedi's test can't enter the eyes of professional testing institutions.
Of course, it is impossible for a single testing agency to cover all the capabilities ifSome capabilities are not covered by certification, such as enterprise standards, and if a third-party organization wants to do it, it needs to attach a large list of statements like the one shown below. If you understand Chedi, you will be "outnumbered", and you feel that you are "authoritative". The ** of this volume must be clearly written.
The above discussion is based on the facts that have been clearly established, in additionSome voices believe that the car emperor has deliberately targeted certain car companies.
I know whether Chedi deliberately targets certain car companies
This problem is actually more serious, because we have reason to believe that each company has no relevant qualifications, even if the national standards are used to do the test, but the qualifications are not, in fact, there is no credibility. Not to mentionMost of the ** people pat their heads and want to test the plan, so we can't beat them to death because they understand the qualifications of the car emperor.
As for whether it is deliberately aimed at some car companies, we can't fully confirm it, after all, no car companies have issued a statement for the time being
Here I will only talk about the general situation of the industry encountered by me as a test engineer.
Generally speaking, if the vehicle-level test is sent to a third-party testing agency, the car company will come to the site to supervise and spot check at each stage of the project, and the third-party testing agency is also obliged to inform the car company of the current progress and answer the reasonable questions of the car company.
If it is a component-level test, generally speaking, the more important the product, the more attention the car company has. For example, key components such as battery packs, motors, and car seats will be deeply involved in the testing process. If the customer is not present, including **, text, video records, etc., must be archived. And these original records need to be reviewed and reviewed by more than two levels of personnel.
However, in the evaluation, the car emperor failed to inform the car company in advance, conduct live broadcast tests, or video archives, which are difficult to explain in the later stage. And this kind of low-level error of opening and closing doors and windows is easy to be found by the review, but it is not found inside.
Of course, the 2023 Winter Test Open Day was held today (14th) to test again. However, in terms of testing methods, there are still many vulnerabilities. For example, the following condition states that the test is terminated as soon as the engine is involved. This method obviously learns Xi the national standard test method, but the national standard method is a room temperature test.
In fact, if it is a low temperature situation (especially in this extreme environment), it is necessary to consider the engine waste heat and battery heating strategy. At low temperatures, the strategies of the engine intervention are inconsistent, and it is not practical to say that it is unified. Just like the martial arts master PK, is it possible that Duan Yu is not allowed to use Lingbo microstep, and can only use the six-vein divine sword in the stump style?
Summary
* It is a good thing to spend a lot of manpower and material resources to do car evaluation, I think the test itself may really be for the good of users, but the practice is rough, in the end, users feel that there is no reference meaning, and car companies feel that they are suppressed, and both ends are not pleased.
And now the car is getting smarter and smarter, how long the car opens the window, how many times the door opens, the system can be recorded. These ** should also be more rigorous, otherwise there is a way to record the mistakes made for you. So the best thing to do is to keep a good record and think about the rules clearly.