“With the development of modern science and technology, many parts and components have been widely used in automobiles, and the sense of science and technology of automobiles has become stronger and stronger. The continuous technological innovation and the endless emergence of new technologies have made the power of automobile engines increasingly enhanced. Supercharging technology is one of them, which plays a key role in improving the power of automobile engines. Supercharging technology is currently divided into two types in the automotive field: one is turbocharging; the other is mechanical supercharging. But our common models often use turbocharging. Why?
With the development of modern science and technology, many parts and components have been widely used in automobiles, and the sense of science and technology of automobiles has become stronger and stronger. The continuous technological innovation and the endless emergence of new technologies have made the power of automobile engines increasingly enhanced. Supercharging technology is one of them, which plays a key role in improving the power of automobile engines. Supercharging technology is currently divided into two types in the automotive field: one is turbocharging; the other is mechanical supercharging. But our common models often use turbocharging. Why?
First, the structural characteristics and working principle of mechanical increase and turbocharging
Nowadays, the displacement of automobile engines ranges from 0.8L to 5.0L or even larger. Supercharging devices can be seen on engines of these displacements. However, many engines only have turbocharging, and some engines have both. Coexisting, let’s first talk about the structural characteristics and working principle of supercharger.
1. Mechanical pressurization
Mechanical supercharging uses the power of the engine to drive an external supercharging mechanism. This supercharging mechanism is a pneumatic machine. The air compressor is driven by the engine to increase the intake pressure. Therefore, the biggest feature of supercharger is its directness. The work of supercharger has no hysteresis. As long as the engine starts to run, the supercharger will begin to intervene in the work.
2. Turbo boost
The structural feature of a turbocharger is that it has two turbines, an intake turbine and an exhaust turbine. Turbocharging uses the energy of exhaust gas discharged by the engine to drive the exhaust gas turbine of the turbocharger to rotate, and then drives the intake turbine to rotate through the shaft pin, thereby achieving the effect of increasing the intake pressure. Turbine intervention requires a certain time and engine speed range, so there is a certain hysteresis in turbocharging work.
Second, the difference between supercharging and turbocharging
There is an essential difference between supercharged and turbocharged. Although the meaning of both is to increase the intake pressure and power output of the engine, the difference between the two is still very big.
1. The scope of use of the two is different
Supercharger is usually used on large-displacement engines, while turbocharging is used on small-displacement engines. Under normal circumstances, a large displacement (above 3.0L) engine will be designed to coexist mechanical supercharging and turbocharging. Generally, only one turbocharger is designed for small displacement (below 3.0L) engines.
2. The structural characteristics and working principles of the two are different
The structure and working principle of supercharger and turbocharger are different. Supercharger is just a simple pneumatic machine, which uses the power of the engine to drive and rotate to increase the intake pressure. There is no lag in the work intervention; the turbocharger is a mechanism The supercharging equipment composed of two chambers uses the exhaust gas energy from the engine to drive the rotation to increase the intake pressure, and there is a certain delay in the intervention of the turbine.
Third, why turbocharging is our common form of supercharging
Supercharging has a strong supercharging effect, and there is no lag in work intervention. Why do the supercharging forms of engines that we see daily are basically turbocharging?
The reason is simple. Large rehearsal engines are usually arranged in sports cars or luxury cars. Such models require strong power output and a strong push back. Therefore, a supercharger is designed, and the price of the vehicle is relatively high. . But a small displacement engine does not need such a strong power, as long as it meets the general transportation needs. At the same time, large-displacement engines have relatively high requirements for intake air volume during operation, so large-displacement engines will be equipped with mechanical supercharging and turbocharging to coexist.
Our daily household models are basically small-displacement engines, which can cope with daily urban mobility and general light off-roading, especially engines with displacements below 2.0L and naturally aspirated engines with displacements below 2.0L. Due to the limitation of quantity, the output horsepower and power will be relatively low, so the existence of turbocharging is of great significance. The intake pressure is increased to increase the output power of the engine, and the cost of turbochargers is lower than that of superchargers, so turbochargers are often used in domestic small-displacement engines.
Summary: Supercharged and turbocharged are very different in structure and working principle, but they have the same fundamental meaning. They are both to increase the intake pressure and ensure the power output under operating conditions such as rapid engine acceleration. Supercharging is usually designed together with turbocharging for large-displacement sports cars or luxury cars, while turbocharging is usually used for small-displacement family car engines, so turbocharging is widely used and is common to us Pressurized form.