Manufacturer of specialized in various engine camshafts
With the introduction of the National Sixth Emission Standard, many four-cylinder engines are unable to meet the stringent National Sixth Emission Standard. Therefore, many manufacturers have made an article on the number of engine cylinders and have increased their efforts to develop smaller three-cylinder engines. Cylinder engine.
Therefore, we can find that small-displacement turbocharged engines are increasingly sought after by major manufacturers. Today, I will take the officials to take a look at the difference between the three-cylinder and the four-cylinder.
Structure of three-cylinder machine and four-cylinder machine Differences
From the structural point of view, three-cylinder engines have one less cylinder than four-cylinder engines, and the corresponding reduction in ignition, fuel supply, and connecting rods of one cylinder For the parts corresponding to the crankshaft and camshaft, due to the change of physical structure, the working conditions of the three-cylinder engine and the four-cylinder engine are very different.
Three-cylinder VS Four-cylinder The advantages and disadvantages of the engine
The most obvious advantage of the three-cylinder engine is that it reduces the volume and displacement of the engine, which is environmentally friendly and fuel-efficient. As the small displacement of the engine becomes a major trend, these two advantages of the three-cylinder engine are becoming more and more important. Let's take a good look at the differences between the three-cylinder engine and the four-cylinder engine in various aspects.
The torque of a three-cylinder engine at low speed is stronger than that of a four-cylinder engine
At low speed, the three-cylinder engine starts more The powerful torque is greater. This is because the volume of a single cylinder of a four-cylinder engine is smaller, and the energy generated by the fuel is less in the case of the same displacement. As a three-cylinder engine has one less cylinder, the average volume of each cylinder is larger and the explosion occurs at a low speed. The torque will be stronger.
Three-cylinder engine has lower fuel consumption
Because the three-cylinder engine has one less cylinder, the engine of the same displacement will be lighter than the four-cylinder engine. The 'NVH Development and Optimization of Supercharged Direct Injection Three-cylinder Gasoline Engine' published by Geely Automobile Powertrain Research Institute stated: 'With the same engine displacement, the three-cylinder engine is lighter, has less friction loss, and consumes less fuel. .'
The three-cylinder machine has a common problem with shaking
>Even if the torque of a single-cylinder is larger, the continuity of a three-cylinder engine is not as good as that of a four-cylinder engine under the same displacement. It is precisely because of this shortcoming that officials discourages three-cylinder engines, such as Buick Hideo, BMW 1 Series, etc., which cannot avoid the common problem of jitter.
Insufficient power of three-cylinder engine at high speed
p>In the case of running at high speed, the power of the three-cylinder model with a turbo decays quickly and is weak. Compared with a four-cylinder engine, there is one less cylinder, which is equivalent to four intake valves and a set of injectors. At the same time, the amount of intake air and the amount of fuel involved in combustion will be less than that of a four-cylinder engine, and the power is not as good as four. Cylinder machine.
Written at the end:
Currently there are many models equipped with three-cylinder engines on the market, such as BMW1 series, 3 series, X1 1.5T models, Buick View Lang's 1.0T and 1.3T models and Honda Civic's 1.0T models and so on. Three-cylinder engines have the advantages of low manufacturing cost, low maintenance cost, light weight, and better driving effect of exhaust pulse on the turbine, which is definitely beyond doubt.
The reduction in the number of cylinders does not mean that the experience becomes worse. Today's three-cylinder engine technology has entered a mature stage. Take SAIC GM’s new generation Ecotec 1.3T/1.0T dual-injection turbocharged engine. Due to the optimal design of single-cylinder combustion, although the displacement is reduced, the power performance and fuel economy are significantly improved. We need to put aside the colored eyes to look at, there will not be so many entanglements.
Note: Some pictures are from the Internet
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