Why is this 1.6TGDI engine on the new generation Tiggo 8 so fuel-efficient?

In the last article, I reported the actual fuel consumption of the 1.6TGDI version of the new generation Tiggo 8 with concrete examples and data. After summing up, I was a little shocked myself. Saving fuel means saving fuel. I knew this for a long time. I didn't expect to save fuel to this extent. ? Originally, my idea was that since the 1.5T version and 1.6TGDI version of Tiggo 8 are the same car, the drag coefficient of the car body is the same, the weight is similar, and the power of 1.6 is much stronger. Even if the fuel consumption is the same, it's good. I didn't expect that Tiger 8 of 1.6TGDI was 60. The abnormal fuel consumption ratio of less than 6 is greater than 1.5t, and the ratio of greater than 10 is obviously less than1.5t. Of course, as I said before, I made random statistics, so I will tell you that the 1.6T version of Tiger Brother came to sunbathe, and everyone made such a pile. In addition, I also said that I think there must be some more than 10, or even more than 12, but this time I really didn't count this. Please read all the articles.

A brief summary of fuel consumption, let's cut to the chase. Today, we will analyze from the technical level why this 1.6TGDI engine on the new generation Tiggo 8 can achieve such fuel economy. ? In fact, a little understanding of automobile engines shows that how to save fuel is actually an open-book exam, or an open plan. In other words, there is no shortcut. Theoretically, we all know how the engine saves fuel, but if we want to achieve the ultimate item by item, it is not a simple matter.

Let's talk about the first factor, throttling and reducing friction? Although it has the lubricating effect of lubricating oil, from the physical principle, the friction between moving parts of the engine is inevitable. What we can do is to minimize friction. ? How to reduce friction? Among them, there are many means. ? For example, improve the machining accuracy, make the surface of parts smoother, and further reduce the friction coefficient of parts by special surface treatment process. ? For another example, the engine needs a piston ring to close the gap between the piston and the cylinder wall. If the pressure of piston ring on cylinder wall can be reduced, the friction can be directly reduced. At the same time, it is necessary to avoid that the cylinder is not easy to burn oil because the piston ring pressure is too small. Simply put, it is necessary to find the best balance point here. ? The specific data show that the friction loss of only 1.6TGDI engine is 20% lower than that of Chery's independent second-generation engine.

It can be seen that Chery has long adhered to the advantages of positive research and development. Because of the design and development from scratch, we know why this is so. Although it is much slower than the reverse imitation of many manufacturers, it is more conducive to mastering first-hand raw data and finding the best balance point. ? And if your engine is reverse copied, the situation is completely different. The general principle of reverse imitation is to take apart the engines you want to imitate, measure them one by one and imitate them. The data you can get is the simplest and most basic reverse data, which is nothing more than surface things such as shape, thickness and size. As for the depth of some prototypes, such as surface friction coefficient, surface technology treatment, material improvement treatment, and some deconstructed data, I don't know why I made this shape and why I made this structure. If I want to improve and solve problems, I often don't know why, so I can't see anything in the gourd.

The second element is to improve combustion efficiency. ? To improve combustion efficiency, the first means is to mix oil and gas evenly? Let's start with something that is evenly mixed. It's simple, but it's actually very difficult. The first is the design of air inlet, especially the design of air inlet. The 1.6TGDI engine on the Tiggo 8 adopts tumble flow design, that is, the sucked air moves at the air inlet and rolls up to form tumble flow, so that the gasoline oil mist sprayed from the nozzle of the direct injection engine and the air can form the most sufficient and uniform mixture after entering the cylinder. The air intake of this engine is not a uniform design of ordinary engines, but an irregular shape similar to a fish belly, which can squeeze the passing air and form controllable turbulence. Of course, this turbulence is actually very particular and very controllable, but the specific principle is too complicated, so it is not necessary for us as consumers to study it so deeply. ? In order to improve the combustion efficiency, the second method is to optimize the design of fuel nozzle. The design of fuel nozzle determines the atomization effect of gasoline and the direction and shape of injection. The more uniform the sprayed oil mist is, the easier it is to form a mixed gas with the intake air, so as to achieve complete combustion and reduce fuel consumption. ? But there is a very troublesome thing, because the engine cylinder is completely closed, which is also very simple. How can the cylinder work without closing? There is an important thing to mention here. When I first heard about it, I thought it should be a joke. ? That is, in order to fully understand and adjust the state of fuel injection and combustion in the cylinder, and make the optimal adjustment, Chery, a scientific and technological person, invested more than 40 million RMB in 20 12 to establish an optical laboratory. The most amazing thing in this laboratory is a single-cylinder engine made of diamond. This engine is the same as the real engine, and all kinds of auxiliary systems are the same, but it is transparent. Outside, you can clearly see the whole process of air intake, fuel injection and mixing, combustion and exhaust in the cylinder, and then take pictures with a high-speed camera. Every time the engine crankshaft rotates, you can take a photo and record all the details. You can take 720 photos at a time to clearly record the atomization state, injection direction and shape of gasoline. ? According to these data, the R&D team repeatedly adjusted and optimized, and finally achieved the best results.

In terms of fuel saving, it also reflects the importance of forward-looking research and development of engines. Because the conceptual design, technical performance demonstration, detailed design and experimental test of the whole engine are controlled by our own team, we will fully consider the goal of fuel saving from the design stage, and then constantly verify some details through our own controllable experiments, and make adjustments and corrections. If we don't have our own R&D system or our R&D strength is weak, although you know the factors and indicators of engine fuel economy like the back of your hand, when you develop an engine, you will either copy it completely, and the copied engine will have many fuel consumption problems, but you can't start to improve it. The engine fuel consumption of some domestic manufacturers has remained high for a long time, but it has not improved. This is one of the important reasons, or you just lack overall thinking when developing, and many interrelated and contradictory performances are ignored, and the gourd floats.

Another important point is the thermal management design of the engine. ? As the owner of several Chery cars and the owner of Tiggo 8, I feel deeply and strongly about this. Engine thermal management technology has a great influence on engine fuel consumption, and the specific reasons will be understood as soon as I tell you. ? We know that the heat energy generated by the engine burning gasoline can be converted into piston kinetic energy to drive the car, and the proportion is relatively low. Where is the remaining energy? ? Part of the exhaust gas is taken away, and there is friction loss, and the most important point is the loss of heat, especially in the cold car stage. Because the engine itself is low temperature, the engine needs to raise the temperature of the cylinder block and other components to the optimal temperature as soon as possible through the heat energy generated by combustion, so that the engine can work normally. Therefore, the fuel consumption of any car is much larger than that of a hot car when the car is cold or the water temperature does not reach the normal value, which is why many taxis with old technology and garbage can still maintain good fuel consumption performance. The main factor is that the hot car has been running. And our daily family car often runs cold for a while before reaching the destination, and the fuel consumption will be high, which is the reason. ? Therefore, the most important thing in engine thermal management is to make the water temperature reach normal as soon as possible under the same conditions, and different engines are very different. Once the engine reaches the normal operating temperature, the heat loss will be reduced. In addition, when the engine reaches the normal temperature, what the thermal management system needs to do is to keep the temperature of the engine body on the premise of reducing heat loss, which requires other technical means to achieve.

Compared with Chery's own old car, I bought Chery A5 16 in 2007, and I used Chery's first-generation engine 48 1, which means the engine water temperature is very slow. If it is particularly cold in winter, the water temperature will reach normal after running for a long time. Before that, people must freeze, because if the water temperature is not enough, there will be no hot air. ? And Chery's new models, such as our Tiggo 8, have extremely fast water temperature. Basically, the engine warms up in a few tens of seconds, and then the water temperature approaches normal in two or three minutes. I believe that the majority of Tiger Eight car owners are deeply touched, especially some old drivers have driven many classic cars, and this comparative experience will be more obvious and profound. For example, my old A5 16 wants the water temperature to reach normal. ? In the ten-minute difference, one car is driving at normal water temperature and the other is driving at low temperature. The fuel consumption difference here is obvious.

In order to reduce fuel consumption, the turbine of turbocharged engine is also very particular. ? First of all, the brand, in the choice of turbine, manufacturers can choose relatively cheap turbine with miscellaneous brands, or they can choose turbines from first-line manufacturers, which can be used roughly or finely. According to the characteristics and design ideas of their own engine models, they can optimize the size and various indicators of turbines to achieve the best power and fuel consumption. ? It also has great influence, such as the size and weight of the turbine. If you choose a small turbine, although it is a turbocharged engine with a hat, the supercharging effect is relatively limited and the power is insufficient. If you choose a large turbine, although the supercharging effect is good, the starting speed will be slow, and the turbine will intervene very late, resulting in car jump and the power window period before the turbine starts. ? The 1.6TGDI engine on the new Tiger Eight is Honeywell's turbine. I don't know much about turbines, but one thing I know is that some Honeywell technologies are used in civil airliners, so this brand should be regarded as one of the best choices. The other is in-depth consideration on the selection of turbine size and weight. In the actual use process, what our car owners can feel is a few points. Whether it is 1.5T EFI engine or 1.6TGDI engine, the turbine intervention time is early and the power is sufficient. At the same time, the turbine intervention time is natural, and there is no feeling of jumping. On the contrary, it is more like the feeling of a naturally aspirated large-displacement engine, and the engine has sufficient stamina. It is felt that the engine has been at the peak power after reaching the peak at around 1700 rpm. ? Of course, there are actually more than so many factors contributing to a car's lower fuel consumption, such as the overall weight loss under the premise of ensuring safety, including the weight loss of the engine itself and the adjustment of the gearbox. Due to the limited space, we don't want to start here. Having said that, I believe everyone will have a basic concept of why this 1.6TGDI engine saves fuel. I hope I can help you. Thank you for your support.