What are the benefits and disadvantages of worm gear pressurization

Turbocharging is referred to as turbo, if you see turbo or T at the rear of the car, it means that the engine used in the car is a turbocharged engine. Since Whittle invented the first turbojet engine, turbojet engines soon replaced piston engines with their powerful power and excellent high-speed performance, becoming the preferred power plant for fighter jets, and began to be used in other aircraft. Structure A turbocharger is a machine composed of a turbo chamber and a supercharger, the turbine chamber air intake is connected to the exhaust manifold, and the exhaust port is connected to the exhaust pipe; The supercharger intake is connected to the air cleaner duct, and the exhaust port is connected to the intake manifold.

The turbine and impeller are housed in the turbine chamber and the supercharger respectively, and they are rigidly connected coaxially. Principle A turbocharger is actually an air compressor that compresses air to increase the amount of air to be intake. It uses the inertia impulse of the exhaust gas discharged by the engine to push the turbine in the turbine chamber, and the turbine drives the coaxial impeller, and the impeller pressurizes the air sent by the air filter pipe to pressurize it into the cylinder.

When the engine speed increases, the exhaust gas discharge speed and the turbine speed also increase synchronously, the impeller compresses more air into the cylinder, and the pressure and density of the air increase to burn more fuel. Technology The turbocharger is installed on the intake and exhaust manifold of the engine, and is in the working conditions of high temperature, high pressure and high speed operation, its working environment is very harsh, and the working requirements are relatively harsh, so the materials and processing technology of the manufacture are very high. Among them, the most difficult to manufacture is the "floating bearing" that supports the operation of the turbine shaft, which can reach a working speed of more than 100,000 revolutions, plus the ambient temperature can reach.

Six or seven or more, by no means the general bearing can bear, because there is oil between the bearing and the inner wall of the body for cooling, also known as "full floating bearing". In addition, although the turbocharger has the effect of assisting the engine to increase the force, it also has its disadvantages, the most obvious of which is the "hysteresis response", that is, due to the inertia of the impeller, the slow response to the sudden change of throttle, even after the improvement of the reaction time is seconds, so that the engine delay increases or decreases the output power. This can be a bit of a stretch for a car that is about to accelerate or overtake suddenly.

Advantages: Makes the combustion in the engine more sufficient Increase the power of the car Disadvantages: Cannot be used at low speeds The cost of cermet is too high.

Benefits of turbochargers.

1. Increase the power of the engine. Under the condition that the engine displacement remains the same, the engine can be injected more fuel by increasing the air intake density, so as to increase the power of the engine, and the power and torque of the engine after installing the supercharger should be increased by 20% or 30%. On the contrary, under the same power output requirements, the cylinder bore of the engine can be reduced, and the volume and weight of the engine can be reduced.

2. Improve engine emissions. Turbocharger engines reduce the amount of harmful components such as particulate matter and nitrogen oxides in the engine exhaust by improving the combustion efficiency of the engine. It is an indispensable configuration for diesel engines to meet Euro II emission standards and above.

3. Provide the function of plateau compensation. In some high-altitude areas, the higher the altitude, the thinner the air, and the engine with a turbocharger can overcome the drop in engine power caused by the thin air in the plateau.

4. Improve fuel economy and reduce fuel consumption. Due to the better combustion performance of the engine with turbocharger, fuel savings of 3%-5% can be achieved.

5. It has high reliability and good matching characteristics, and high transient response characteristics.

Disadvantages of turbochargers.

1. Speed up problems.

Because the inertia of the impeller is slow to respond to sudden changes in the throttle, it means that there is a time lag between when you press the throttle to increase the horsepower and when the impeller rotates to press more air into the engine to get more power, and this time is not short. Generally, the modified turbo also takes at least 2 seconds or so to increase or decrease the engine power output. If you want to accelerate suddenly, you will feel like you can't speed up in an instant.

2. Acceleration problem.

Due to the design principle, the driving experience of a car with a turbocharger is somewhat different from that of a car with a large displacement.

3. There are few start-up opportunities.

If your car is often driven in the city, then it is really necessary to consider whether you need a turbo, because the turbo does not start all the time, in fact, in daily driving, the turbo has few opportunities to start, or even does not use, which has an impact on the daily performance of the turbocharged engine.

4. The maintenance cost is high.

Turbocharging also has maintenance problems, after all, it has added a maintenance fee to their car, which is particularly noteworthy for owners whose economic conditions are not particularly good.

Turbocharging has the following disadvantages: 1. Speed up problem: due to the inertia of the impeller, it is slow to respond to sudden changes in the throttle, that is to say, there is a time lag between the driver stepping on the accelerator to increase the horsepower and the impeller rotating to press more air into the engine to obtain more power, and this time is not short.

2. High maintenance costs: turbocharging also has maintenance problems. 3. There are few start-up opportunities.

The turbo is not always in a state of starting, and in fact, in daily driving, the turbo has few or no opportunities to start, which has an impact on the daily performance of the turbocharged engine.

The biggest benefit of turbocharging is that it can significantly increase engine power without increasing engine displacement. Non-turbocharged engines draw air directly from the atmosphere through the movement of the crankshaft, while turbocharged engines are supplied with compressed air by a turbocharger.

As more air enters the cylinder, more fuel is allowed to be injected to allow the engine to generate more power and have a higher combustion efficiency. This means that an engine of the same size and weight can produce more power when supercharged, or a smaller displacement engine can produce the same power as a larger engine when supercharged.

The turbocharger allows the non-supercharged engine to be compensated for oxygen when working at altitudes, and the engine works with the turbocharger to keep the intake pipe pressure at sea level atmospheric pressure. But the power of the naturally aspirated engine decreases with altitude.