The previous engine variable valve timing technology has always been in the hands of Little Japan.

There is a reason for this, Japan has a small land area, it has almost no special products, almost all industrial raw materials need to be imported, and oil, as the most important strategic material, is no exception, so the unique sense of crisis in the nature of the Japanese makes them pay great attention to how to make cars more fuel-efficient.

How to maximize fuel saving in the engine has become the biggest research topic for Japanese automobile companies. In this context, the engine variable valve timing technology with good fuel economy has been studied by Little Japan, and Little Japan is also holding this somewhat chicken technology to talk about things all over the world.

As for fuel-saving technology, ahem, don't expect the Americans, who are now advocating big cars and high-power engines, to think of this, as evidenced by the crazy civilian version of the Hummer sold by the Alice (America) Group, despite the fact that this car is an oil tiger, with its strong torque and huge body. In particular, the strong off-road ability and carrying capacity make Americans who like large-volume and high-power models love it.

In fact, although this engine variable valve timing technology does have good fuel economy, it is not as good as little Japan advertises, and the fuel economy is not as good as they claim, especially when the engine reaches high speeds above 5000 rpm, the fuel economy of the engine is not as good as that of naturally aspirated engines without variable valve timing technology.

At the very least, international luxury car manufacturers such as BMW and Mercedes-Benz have not adopted these technologies. But Zhang Lan also has to admit that if the car needs to go down in the city at a low speed of less than 40 kilometers per hour, and the engine runs at a low speed of less than 2500 rpm, the engine with variable valve timing technology does have a pretty good effect on fuel economy.

But if you use the engine at 2,500 to 4,500 rpm at 40 to 80 km/h, the fuel-saving effect of the variable valve timing technology is not so obvious – of course, it works again.

Unfortunately, cars in China generally seem to exceed the two fuel-saving requirements of engines with variable valve timing: less than 40 km/h and less than 2,500 rpm.

Zhang Lan can think about it, something is better than nothing, and it is a little bit to save a little.

Little Japan really wants to stump others through the various engine technical barriers it has set up. At the very least, you can collect royalties, but this time the Japanese are destined to be disappointed. The old Maozi researchers at the Alice Automobile Engine Research Institute are very good at innovating, not only successfully bypassing the technical barriers of small Japan in this technology. In addition, the second generation of engine variable valve timing technology was developed.

This new technology, that is, not only in the engine intake valve adjustment using this technology, but also in the exhaust valve control also uses such technology, the original dual engine variable valve timing technology technology was originally made by the later Chery Automobile, Zhang Lan did not expect that this group of old Maozi is also advanced in design thinking. I actually got this technology out in advance.

Now, all Zhang Lan can do is secretly think about the future Chery and say sorry, digging into the corner of the foreigner Zhang Lan is not embarrassed at all, and does not feel blushing at all; Digging the corner of his own people's wall, Zhang Lan felt a little embarrassed, although this corner is still a corner of the future, and now this wall has not even been built.

"How heat-resistant is this engine?" Zhang Lan asked Shiriyakov, who is the leader of the design team of the 1.8-liter inline four-cylinder water-cooled EFI engine, "Especially in the design of heat dissipation, how do you do it?" Don't go in the summer, the car can't drive far and then turn on the pot. ”

The reason for this question. It is because of the poor high temperature resistance of the Soviet engine, Zhang Lan knows that this problem is not a problem in the Soviet Union, and the lower temperature there is definitely conducive to the heat dissipation of the engine, and there is rarely a problem of engine boiling.

But when the same engine arrived in China, it began to adapt to the soil. One thing Zhang Lan knows is that, of course, the Type 59 main station tank imported and produced by China from the Soviet Union must stop and let the engine dissipate heat after running for more than 100 kilometers in the summer, otherwise the engine will be in danger of boiling. Although these engines are all water-cooled models. However, the problem of engine boiling was only solved after more than 20 years of knowledge.

For these old Maozi engine designers who are in the same vein, Zhang Lan is really worried about this problem, for fear that they will make a Soviet version of the engine for themselves. Therefore, at the beginning of the engine design brief, in order to avoid this situation. One of the most important points in the engine development task book is to focus on solving the problem of engine heat dissipation, especially in summer, when the engine is easy to boil.

The engine is not only a unique problem of the Soviet-made engine, but also the domestic Santana, Fukang, and Jieda in the summer, and even later, the more advanced model of Shanghai Volkswagen, the Santana 2000, is also normal in the summer. But the symptoms of the Soviet engine in China are particularly bad, think of the Soviet Union at the beginning of the founding of the People's Republic of China to support the construction of China to build the FAW production of the Jiefang truck, that car in the summer, the engine has an almost paranoid fanaticism for the pot, as if it can not show its Soviet blood without a while.

"Of course, this problem is the same as the design of the intake and exhaust and cylinder blocks," said Shiryakov, pointing to the engine cooling system designed by his research team to show Zhang Lan, looking proud, obviously proud of the unique design of his team.

"See? We have broken through the design of the traditional heat dissipation method of the engine, not only increasing the volume of the water tank and the circuit of circulating water inside the engine, but also using the design of double radiators on the outside, such a design is enough to ensure that the car equipped with this engine and heat dissipation system, even if it is in the summer of more than 50 degrees of high temperature weather for a long time, as long as there is no lack of cooling water, even if the fuel tank is filled until the whole tank of oil is burned out, the engine will not have any problems. This is designed for China's unique conditions, and according to our calculations, even in the hottest summer, the car will not have any problems with the engine when driving on your hottest island, Hainan Island. Shiryakov said, his face flushed, clearly pleased with his unique design.

Zhang Lan looked carefully at the engine cooling system designed by Shiryakov, indeed, by comparing it with his previous cars, this cooling system does look much better than the heat dissipation system on his own cars, but it seems to be much more complicated.

Now Zhang Lan is more worried about a question: how much will the cost of a car with such an excellent cooling system rise?

"How much does the cost of this engine, together with the cooling system, increase compared to the traditional cooling engine?" Zhang Lan asked.

"The cost will go up about three to five percent," Hiryakov said, "and the increase will be mainly due to the extra radiator and the cooling fan that matches the radiator, as well as the relatively complex design of the water pipes." ”

Three to five percent cost increases? Zhang Lan nodded, this data is acceptable, but a new question appeared in Zhang Lan's mind: looking at the volume of these two radiators, the volume of a single radiator is about the same size as the volume of a traditional radiator, plus a lot of complex pipelines, in the extremely limited space in the engine compartment, how do these guys plan to install these two radiators?

The traditional engine has only one radiator, which is naturally very convenient to install, and is placed directly in the front of the front of the car, because the car is moving forward, so there is always air blowing the radiator, plus the role of the cooling fan, the heat dissipation effect is also the best, but now this extra radiator and fan, where does Shiryakov plan to install this set of things in the car? Do you want to put it side by side in front of the car? Not to mention the forward shift of the center of gravity to the whole car, it is the design of the air intake at the front of the car, so how big does the air intake need to meet the heat dissipation needs of the two radiators?

Zhang Lan recalled carefully, even those cars that were known for their big mouths in later generations only increased the front air intake, increased the air volume of the natural wind flowing through the radiator, and at most increased the volume of the radiator, and also increased the heat exchange capacity of the radiator.

The difficulty of production, high cost and inconvenient installation directly limit the practicability of this cooling system. Well, of course, in terms of heat dissipation, the dual radiator is of course much better than the but radiator.

Well, it's a great solution, but it's also unique enough. Zhang Lan secretly smiled bitterly in her heart: I am still deeply influenced by the design ideas of motorcycles, the radiator on the motorcycle is easy to install, but what about the car? It's really very difficult, think about the engine compartment that was originally stuffed to the full, and now it has to be stuffed into a set of heat dissipation system, doesn't that mean that the design of the entire body frame has to be pushed over again? What's the point of everything you've done before?

"Little boss, what do you think of this design?" Shiryakov's face was excited, looking at what this guy meant, as if he was looking forward to Zhang Lan's praise. (To be continued, if you want to know what will happen next, please log in to the www.qidian.com, more chapters, support the author, support genuine reading!) )