Many domestic engine paper data is quite strong, the actual battle seems to be not so strong, is it "false standard"?
Part of the reason is that it is indeed possible to "virtually mark" the dynamic parameters, of course, with quotation marks.
Engine data is falsely marked
Deliberately inflated data
First of all, there is no unified standard for the calibration of engine power data, which will lead to various manufacturers doing whatever they want and talking to themselves.
The only relevant national standard in China is GB/T 21404-2008, you see, pretty early, right? "General Requirements for the Determination and Measurement of Engine Power in Internal Combustion Engines".
And this is actually a recommended national standard, manufacturers can voluntarily choose whether to use.
For example, the maximum output power advertised by the manufacturer does not indicate under what conditions and according to what standards the test is, basically how much horsepower the manufacturer says is how much horsepower, and how much power is how much power.
You have to sue it, find it, it is measured according to its conditions, it is really this power, and there is no way to take it.
In this case, there may indeed be some models or manufacturers deliberately trying to find a way, use their brains, "smart and clever", the kind with quotation marks, and get the engine data up.
Disguised "dotted" data
The second situation is that the manufacturer actually does not have false data, but chooses the test method that is most conducive to the manufacturer's publicity.
Different manufacturers, even different countries, use different horsepower test standards, which will also lead to differences in the final data.
For example: Japan uses JIS, the United States uses SAE, Germany uses DIN, and there is an ISO international standard, and the test methods are different.
For example, Japan's JIS and Germany's DIN: the JIS standard will remove all the load connected to the engine, so the tested value will be relatively large.
The standard of DIN is that the engine will be connected to all loads for testing, and the value will be relatively small.
Like a lot of friends over there said: "Hey, BMW, you don't look at it marked small, its engine power is marked on the side of the tires on the wheel horsepower." "It's probably because of the different standards I mentioned earlier.
Speaking of people' words: in order to make their own car engine data look good, is it not easy to sell? Right? It chooses a test criterion for data maximization.
It belongs to the problem of drilling holes, moving small and clever, and a bit "bullying" our cognitive blind spots.
It's like: I said I had $1,000 trillion in savings, which sounds scary, right? Awesome, right? The richest man, right? Right?
There was a very small row of words in the back, and when people came to sue me and check on me, I wrote on it: My money is Zimbabwean dollars. It's similar to that, right?
Someone else said, "I have 1,000 trillion yuan in savings, and I have 9999.9999 trillion yuan in this debt." "It's the same thing.
Actual combat is influenced by many factors
Actual combat results are also affected by many factors
For cars without false standards, when the actual combat acceleration test is tested, it will also be affected by various factors, which will also lead to a poor match between the performance and engine power data.
Yu Chixiang published a paper in the journal "Practical Technology of Automobiles", "Energy-saving Technology to Reduce The Loss of Automobile Machinery", which said above.
When the engine power output to the wheel, it will pass through the various transmission devices, gearbox, transmission shaft, etc. will cause corresponding mechanical losses, and the power consumed is generally 10% to 30% of the engine output.
It's like: holding a handful of sand in your hand, taking a step and leaking a little, taking a step and leaking a little, when you get home, there is not much sand on your hand, right?
In actual combat, the quality of accelerated performance is mainly dependent on the output of the wheel.
To put it simply: the manufacturer may not have the false standard engine data, but the level of suppression of mechanical loss is not high enough, the work is not good enough, and the final acceleration performance is not satisfactory.
Compared with the standard data, how does "hey" seem to be quite different? Right?
For example, with reference to the test of a car's horizontal evaluation, the on-wheel horsepower achievement rate of mainstream domestic cars is basically 60% to 80%, and the achievement rate of joint venture brands is basically between 75% and 90%.
The most terrible benchmark product, the 2021 BMW 325Li, has a reach rate of 93.59%, which is about equal to this engine... It is very close to the wheel, which is worthy of praise.
The impact of vehicle weight
In addition, almost horsepower of the car can not only look at the acceleration results, some friends only look at the comparison of 2 car acceleration results, 9s that is always slower than 8s, right? 9s is garbage, it's bad, right?
But in fact, the impact of car weight on acceleration performance cannot be ignored.
I have done in the previous video, "a car with a small displacement, the power must be weak" has been discussed in detail above, here is a brief description.
Even if the engine power is poor, as long as the car is light enough, it can also make the acceleration very fast, very powerful, which must increase the power in disguise.
After experiments, every time a Civic Si reduces the weight of 8.25kg, it can increase 1 horsepower in disguise.
So, you see, the 2-ton car and the 1.5-ton car are actually not easy to judge which engine is stronger just by looking at the acceleration results.
Poor actual combat or good actual combat may not be able to look at this thing most objectively and fairly, and there are more dimensions.
There are no uniform test standards and regulations
All in all, due to the lack of unified test standards and regulations, manufacturers in order to manufacture publicity points, many domestic car engine paper data do exist in the so-called "false standard" phenomenon, but this is also the case abroad.
In addition, the drag of the drivetrain will also lead to a great reduction in the actual power of the engine output to the wheel, resulting in the result of poor actual combat results.
Therefore, the biggest advice to everyone is: buy a car can not just look at the data, drive a lap yourself is tighter than anything.
Why can't domestically produce top-of-the-line engines?
We also thought, it's very interesting, Made in China is now quite strong, atomic bombs, big aircraft... Everything, the engine is a simpler thing, the principle is also very simple, early on a drawing out.
Why can't domestically produce top-of-the-line engines? Are you reluctant to build? Or can't it be built? Or no money to build it?
It is said that the Honda engine is very powerful, buy an engine, the whole car is still sent to you, so why not take it over and dismantle it, and start it again as it is? It's coming soon.
Why can't you do that? Why don't you want to do this?
Keywords: domestic
Want to know these is very simple, pay attention to the WeChat public account "spare tire car", reply to the keyword "domestic" can be.
I this public number, every day will give you a piece of car practical small dry goods, text, audio, video have, pick your own favorite version on it, "spare tire said car" waiting for you to play Oh.
bibliography
[1] GB/T 21404-2008.General requirements for the determination and measurement method of engine power of internal combustion engine[S].
Yu Zhixiang. Energy-saving technology to reduce automotive machinery loss[J].Automotive Practical Technology,2016.