It's like saying: I used to have poor academic performance and couldn't even understand the questions. Just copy "ABCD" and copy the answer. I can pass 60 points first. Now the academic performance has gone up, and I get 80 points for doing homework or something. Let me copy it, 60 points. Why bother? Right? Accidentally copied it wrong and got caught, right?
Reverse R&D also has a second innovation.
First of all, reverse research and development is not as simple as we thought, so it is not the same as when I was studying before. I can't do my homework He writes an A, and I can write an A. He writes an A because it is beautiful. We wrote an A, but the A was crooked. The teacher said, "This is not a score." This is a little strange.
There is a paper "Research on the Development Path and Capability Evolution of External Technology Integration of China Automobile Enterprises" written by Beijing Jiaotong University: Because the buyer did not participate in the design, R&D and manufacturing process of parts at all. The principle, design, architecture and manufacturing technology of parts and components cannot be automatically transferred to the minds of the buyer's R&D personnel only through purchase, installation and use.
The overall logic of reverse R&D and forward R&D is not as big as we thought. Forward R&D: abstract the concept description of the product from the market demand, establish the CAD model of the product, and finally get the physical prototype of the product. How does reverse development work?
Product development begins with an object or model, and CAD models are made according to this object. Then on this basis, the existing products are analyzed, understood, improved and innovated. You see, reverse research and development, seemingly simple copying homework, is actually learning the problem-solving methods of the same table, and it is called "copying" when it is thoroughly understood. If you encounter similar problems in the future, you have to solve them yourself. This is a success. It's not so difficult to study hard by yourself.
The difference of machining accuracy has great influence.
Also, reverse research and development, drawings are not available, that is to say, engineers have no way to know the exact size of parts, only by quantity.
Anything with the word "quantity" is biased, not only in measurement, but also in engine parts. Theoretically, no two parts are exactly the same. There is 1 Honda on the left and 1 Honda on the right. The two parts cannot be exactly the same. The parts themselves are of different sizes, and there are errors in measurement. If you copy it casually, the parts you get are likely to be very different from the original drawings. Moreover, once there are differences in parts manufacturing, it will directly affect the performance of the engine itself.
Shanghai Jiao Tong University has a paper "Research on the Relationship between Engine Manufacturing Accuracy and Performance", which has done similar experiments. As a result, it says: nothing changes, so long as the compression ratio deviation caused by the difference of parts is reduced from 0.24 to 0.18, the power of the experimental engine can be increased by 0.7%, the fuel consumption can be reduced by 0.5%, and the tendency of impact and explosion can be reduced.
I didn't ask you to have plastic surgery, to paint your eyebrows, or to do your hair again. If you wash your face and wash all the dust off your face, people will think you look fresher and more beautiful. On the other hand, if we don't know the size of the parts, the error will be too big, which will have a great influence on the performance of the engine.
There are patent barriers
In addition to the difficulty of reverse R&D itself, there will be patents and technical barriers in the reverse process. Take Honda's proud VTEC technology as an example. Honda has registered a number of patents.
According to the WTO Agreement on Trade-Related Aspects of Intellectual Property Rights, the protection period of a patent is 20 years. In other words, in 20 years, even if you dismantle it and understand what happened to VTEC, you still can't completely copy it.
The old technology of 20 years ago is not necessarily competitive in the market, is it? Moreover, Honda's patents are actually more than that. According to the ranking of automobile patent scale released by Japan Patent Results Company, Honda's patent number among Japanese automobile enterprises is only behind Toyota, whose revenue scale is larger than its own 1 times.
Mazda leads nearly 1 times in the field of active safety from three major components. In addition to Japan, Honda also pays special attention to the distribution of patents in the United States, China, Germany and India. Domestic car companies want to copy Honda's engine, which can be said to be a lot of barriers.
Now domestic car companies basically don't need reverse research and development.
Generally speaking, domestic car companies have basically passed the era of relying on reverse research and development to produce products. The R&D strength of each company has reached a higher level. Compared with Honda's star product L 15B, there is not much difference in product data.
Domestic engines, best used to say the engines of independent car companies, have all improved now, but the technology is not the same.