Is there any difference between mechanical and exhaust gas boosting in a turbocharger? What are the

There are two kinds of turbocharging, one is exhaust supercharging, which is more common, such as Bora, Passat and A6 are exhaust supercharging, and Mercedes-Benz S600 is mechanical supercharging turbocharging technology, which can also be transliterated as Taibao. Readers who have read "Water Margin" must be no stranger to the character of Shenxing Taibao Dai Zong, his"Divine Practice"It seems to be true: with two armoured horses tied to their legs, they can run 500 miles in one day; If you tie four of them, you can fly eight hundred miles.

Just like the car's"core"If it were replaced by an engine with turbocharging technology, it would also become a veritable superpower. Supercharging, a type of supercharger that increases the output of the power wheels without increasing the engine exhaust volume. The supercharger is driven directly by using the engine's output, and then high-density air is fed into the cylinder to increase the engine's power output.

Exhaust gas boosting is a device used to increase the intake air charging density of the engine to increase the average effective pressure to increase the power and improve the economy, mainly used in diesel engines. Exhaust gas turbocharging systems are more commonly used in automobile engines.

Your question: Is there any difference between mechanical pressurization and exhaust gas pressurization? What are the advantages of each?

The supercharging --- is to increase the amount of air and fuel injected per unit volume of the engine, so as to increase the power. That is to say, supercharging is to increase the air intake of the engine, so that more fuel can be injected and the maximum power per unit volume of the engine can be achieved.

1. Mechanical supercharging: that is, the engine drives a fan installed in the intake pipe through the belt; This results in higher air intake.

Advantages: The engine turns the fan, and the low-speed boosting effect is good.

Disadvantages: Lose part of the engine's energy, and the supercharging effect is not obvious at high speeds.

2. Turbocharging: It is to use the exhaust energy of the car to drive the coaxial fan installed in the air intake pipe to increase the air intake.

Advantages: no loss of engine energy, good engine high-speed supercharging effect.

Disadvantages: When the engine is at low speed, the supercharging effect is not obvious. Maintenance Chen Bengao.

In short, if the displacement of the car is below, the supercharging effect is average, making the fuel consumption relatively large.

- Hope it helps.

First of all, your concept is wrong, the supercharger is only divided into turbocharging and mechanical supercharging, and exhaust gas supercharging is turbocharging. Turbocharging has hysteresis, the general engine below 2000 rpm turbo does not work, at this time feel that the vehicle is weak, 2000 or 2500 rpm above the turbine work, the power bursts, the acceleration feeling is stronger, the mechanical supercharging is directly driven by the engine, there is no hysteresis, the power output is very linear, but the fuel consumption is definitely higher than the turbo. Compared to the two, turbocharging is more common and operates relatively and independently of the engine, but there is not much difference between the two in the high rev range.

Superchargers are divided into, exhaust gas turbocharging, mechanical supercharging (also turbocharging is only driven directly by the engine), and air wave supercharging.

Exhaust gas turbines have hysteresis, while mechanical turbines are smoother. The inlet air temperature of the exhaust gas turbocharger will be higher, and the lubrication and cooling conditions of the turbine itself will be higher.

Turbocharging is driven by the exhaust gas to drive the turbine impeller to rotate, the rotation of the impeller pressurizes a large amount of space into the combustion chamber, so that the gasoline burns more thoroughly to improve the explosive power, and the mechanical pressurization is also to pressurize the air into the combustion chamber, that is, the drive of the impeller is directly linked by the speed of the engine.

First, let's talk about supercharging.

The supercharger is directly driven by the engine crankshaft belt, and the compressed air enters the engine cylinder to produce a pressurization effect. The characteristic is that the engine can also provide the corresponding supercharging effect at low speed to improve the power performance, but it needs to lose part of the engine's power, especially in the high speed area, increasing the engine's fuel consumption. As a result, mechanical supercharging is rarely used in today's passenger car upper-grip, and only a few racing engines still use this supercharging.

Advantages: Synchronized with engine speed, good boost response, consistent acceleration of the car, especially in the low-rev area.

Disadvantages: There is a part of the loss of engine power, and the acceleration effect in the high speed area is not obvious.

Next, let's take a look at how turbocharging works.

Turbocharging uses the energy generated by the engine during the exhaust process to drive the turbine to rotate, and the exhaust turbine is directly connected to the intake compressor to achieve the effect of intake air boosting. It is characterized by the ability to increase the intake pressure and improve the power performance of the engine without consuming the energy consumption of the engine.

Advantages: The exhaust energy of the engine is effectively used to provide pressurization for the air intake system, and the energy saving effect is good.

Disadvantages: The exhaust energy in the low speed area is insufficient, the supercharging effect is not obvious, and the intervention of turbocharging can not be felt until a certain speed has passed, and the acceleration has a sense of delay and incoherence.

To put it simply, the power output of the naturally aspirated engine is smooth, and the fuel consumption is high at low speeds; The acceleration response of the supercharged engine is good, and the fuel consumption is increased at high speeds; Turbocharging, on the other hand, uses the energy generated by the engine during the exhaust process to drive the turbine, saving the energy consumption of the engine and improving the power output of the engine.

Advantages of supercharging:

Mechanical supercharging completely solves the phenomenon of throttle response lag, turbo lag and sudden power output, and achieves instantaneous throttle response, and the power is output linearly with the speed, increasing the driving performance effect. In addition, at low speed, high torque, and instantaneous acceleration, supercharging technology is superior to turbocharging technology. Mechanical pressurization technology does not need to be connected to the engine's lubrication system, does not require cooling, is maintenance-free, works reliably and has a long service life.

Lack of source coarse imitation point.

The acceleration effect is not very noticeable, and it is not much different from the naturally aspirated engine.

It will lose part of the kinetic energy of the engine, and the supercharging is driven by the belt, and in the final analysis, the driving force is still the engine.

At high speeds, a lot of friction will be generated, which will affect the increase of speed and make a lot of noise.

Advantages of turbocharging:

The turbocharging structure is simple, the cost is low, there is no maintenance, the power bench respects the exhaust from the engine, so it will not consume the power of the engine, and the engine is better in the high speed range.

Disadvantages: The turbocharger needs the engine to reach a certain speed before it can intervene in the work, before which the engine is equivalent to the power of a self-priming engine, so there will be a certain hysteresis in the power of the turbocharged engine.

1. The dynamics are different.

Turbocharging can get a very good dynamic front end at low revs, while turbocharging will lag.

2. Turbocharging is different.

The increase in power at high autoclav is very limited, while turbocharging is not.

If you are a person who understands cars, I don't know if you have noticed that the supercharged engine that was once as famous as the turbo has been silent for a long time. Isn't the supercharger, which has been used since the beginning of the last century, been born for nearly 50 years and still turbocharged and cooled? Naturally aspirated engines, also known as NA (English normally aspirated) engines, directly deliver air from atmospheric pressure to the engine cylinders, without pressurization, by mixing with fuel, combustion in the cylinders to do work, to provide power output to the engine.

One point: the air intake system is simple and straightforward, the engine power delivery is smooth and smooth, and there is no noticeable lag when stepping on the accelerator. Cons:

The idle and low-speed zones do not give full play to the maximum performance of the engine, resulting in increased fuel consumption. On the contrary, the supercharged engine compresses air into the cylinder through external pressurization, providing more combustible air in the cylinder, making the fuel burn more fully, thereby improving the engine's power and fuel economy. It is characterized by improving the power output of the engine by supercharging the air intake on the basis of the original performance of the engine, which is often referred to as small displacement and high horsepower.

Actually, it's not, but in terms of popularity, mechanical supercharging is not as popular as turbocharging. These are the result of the different characteristics of the two. Turbocharging is characterized by fuel efficiency.

As long as the speed reaches the specified range, the turbocharging can be started, and the engine speed requirements are not high, which can not only save fuel, but also achieve a good power level. Fuel-efficient + good power. At the same speed, turbocharging works better than mechanical supercharging.

These three points are the advantages of turbocharging. That's why the small-row T-engine is especially popular now.

The supercharger is directly driven by the engine's crankshaft belt, and compressed air enters the cylinder to produce a pressurization effect. It is characterized by the fact that it can also provide a corresponding boost effect to increase the power when the engine rotates at low speeds, but it needs to consume a part of the engine power, especially in the high-speed area, to increase the fuel consumption of the engine. Therefore, today's passenger cars rarely use supercharging, and only a few racing engines still use this supercharging method to make the shortage of capacity.

The disadvantages of turbocharging are also obvious, because it takes time for the turbo to intervene, and before the turbo does not intervene, the power is the power of a small displacement engine; In addition, the turbine involved in the engine work will have a lag in the power output, and the power will "gush out" for a period of time. The feeling that comes with this is not acceptable to everyone; The most important point is that the life of the turbocharger must be considered, and later maintenance is also an issue.

The advantage of turbocharger is that it can effectively use the exhaust volume, which can achieve the effect of energy saving, and the disadvantage is that the effect of supercharging is sometimes not obvious, and sometimes there is a sense of delay. The advantage of mechanical supercharging is that the effect of increasing is very good, the vehicle will be very fast in the process of acceleration, and the disadvantage is that it will cause loss to the widening combustion engine. Mainly because of the demand of the market, now small displacement family cars will be more common, mechanical supercharging is not quiet, and it is suitable for small displacement Qibu cars.

The advantage of turbocharging is that the fuel consumption is very low, it does not intervene at low speeds, and the power at high speeds is very strong. The downside is that sometimes there is a sense of frustration. The advantage of mechanical supercharging is that the low-speed power performance is good, there is no sluggish phenomenon, the disadvantage is that it is very fuel-consuming, and sometimes the power is not enough in the process of high-speed driving.

The disadvantages of this supercharging method are very obvious, and it is not suitable for home use when there is a chain Kai.

Turbocharging can increase the air intake of the engine, which is conducive to improving the intake efficiency, and the axle can be removed to ensure the torque and power of the car. Mechanical supercharging can ensure the pressure of the engine speed, and the feeling of acceleration is relatively linear, but the light consumption of oil celery is not obvious, and it needs to be driven by the belt. Because of the technological innovation nowadays, almost all models are turbocharged.

Supercharged engines have been in production for many years, and the main ways of supercharging are turbocharging and supercharging. However, most of the supercharged engines we usually see are turbocharged, but very few are mechanically supercharged. Why do manufacturers like to use turbocharging instead of mechanical sliding pressure?

Let's talk about this topic today.

Why is it necessary to supercharge the naturally aspirated engine when working, the piston sucks air into the cylinder, and the supercharging refers to providing high-pressure air at the intake end of the engine, so that the air body actively enters the cylinder, so the supercharging can make the cylinder enter more air-fuel mixture and improve the engine power.

TurbochargingTurbocharging uses the exhaust energy of the engine to pressurize the air body. The supercharger is mounted on the exhaust manifold. The exhaust gas of the engine drives the turbine to rotate, and the turbine drives the coaxial compressor impeller to pressurize the air body and transport it to the engine intake to achieve pressurization.

The turbocharger is driven by exhaust gases, and when the engine is running at low speed, the amount of exhaust gas is not enough to drive the turbocharger to reach sufficient boost pressure, so the turbocharged engine will only have a boosting effect after reaching a certain speed. And there is a delay from pressing the throttle to increasing the displacement, so there is turbo lag in turbocharged engines.

At present, small turbochargers are widely used in family vehicles. Small turbochargers have a low moment of inertia and are easier to drive. Many family cars can reach maximum torque at very low revs, and turbo lag can also be improved to a certain extent.

But in the high-speed range, although there is a large amount of exhaust gases, due to the volume of the supercharger, the boost pressure it can provide does not rise too much. But the most commonly used family car is in the low-speed range, so the small turbo is perfectly adapted to the family car.

However, performance cars generally prefer to use larger turbochargers, or even multiple turbochargers. Large turbines have a large moment of inertia and are more difficult to drive, so the maximum torque and speed of performance cars are relatively high. But at high speeds, there is plenty of exhaust gas, and the big turbo can provide more boost pressure, so performance cars tend to squeeze out more power.

Moreover, the engine of a performance car is often at high speed in use, so a large turbo is more suitable.

Turbocharged state riders are cheaper, but the turbine operating temperature is high, and the engine heat dissipation requirements are high.

The supercharger is driven by the engine, which is connected to the engine by a belt, and drives an inner spiral air compressor to provide intake air boost to the engine.

Since the supercharger is directly connected to the engine, there is almost no delay in supercharging, and the engine can provide supercharging as soon as it starts, so the power output of the engine is very smooth, and some luxury cars can achieve better driving quality by using supercharging.

But the supercharger is more expensive, the higher the speed of the supercharger, the greater the moment of inertia, and the more engine power is consumed. As a result, the maximum power of the supercharged engine will be limited to the high-speed range, as the supercharger consumes a lot of engine power.

Overall, supercharging is more of a icing on the cake and is suitable for use in situations where driving quality is critical. Turbocharging, on the other hand, is more of a stimulant and is able to get the desired power at the lowest possible cost.

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