Briefly describe the principle of diesel engine supercharger and the working principle of diesel eng

How to choose the type of gas-liquid booster cylinder: first of all, we must choose a high-quality brand, recommend the old brand of "Jiurong", and then select the model according to the power pass (standard, adjustable, direct pressure, composite, single-row, fast, parallel, etc.), and then determine the stroke and output tonnage according to the work requirements, and then select the installation method (vertical installation, horizontal installation, flip-mounting, installation at any angle), and the detailed model can be obtained after the above items are confirmed.

At present, as emission regulations become more stringent, engines are becoming more and more reinforced. Nowadays, whether it is a gasoline engine.

Or diesel engines have already used supercharging technology.

Regarding the supercharging principle of diesel engine, we first need to understand the relationship between the air intake of the diesel engine and the performance of the engine

We know that diesel is injected into the cylinder to form a combustible mixture with the air entering the intake stroke, due to the physical properties of diesel.

It can not achieve the same atomization effect as gasoline, if the air intake is more, the formation of combustible mixture increases, the fuel combustion is more sufficient, and the engine power, economy and emission performance can be improved.

Then, the role of supercharging is to use the energy of the engine exhaust to push the turbocharger turbine blades, and the turbine and the compressor are connected, from the push compressor to work, so that the intake pressure increases, the air intake of the engine increases, and the engine performance improves.

However, the supercharged engine also increases the intake air temperature, which is easy to detonate in the gasoline engine, and rough in the diesel engine, the engine works unevenly, and the noise and vibration increase, which is why some riders prefer the naturally aspirated engine.

The reason for it, Japanese cars.

I have a soft spot for self-priming engines. In addition, exhaust gases are turbocharged.

The engine is not very responsive and weak at low revs, so there is a minimum critical speed for any start.

Finally, it needs to be said that in addition to exhaust gas turbocharging, there is also mechanical supercharging.

Compared with turbocharging, supercharging can make up for the weakness of turbocharging at low speeds, but supercharging will increase the mechanical loss of the engine and reduce the effective power output of the engine. Both have their own adaptability. At present, there are some foreign engines using dual-supercharging technology, among which Volkswagen's TFSI engine is a typical representative.

Hope, thank you!

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 coming in from 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, and the impeller compresses more air into the cylinder, so that more fuel can enter the cylinder for combustion, so that the output power of the engine can be increased.

The function of the supercharger: to increase the amount of oxygen intake, so that the combustion of diesel fuel is more sufficient, so as to increase the power of the diesel engine. Without a supercharger or intercooler, the power of the diesel engine will decrease, and at the same time, due to the different fuel supply of the high-pressure oil pump of each model, it will cause great damage to the generator and waste fuel.

The main function of the turbocharger of diesel generator set is to press the air into the cylinder, and this process is called pressurization. Four-stroke diesel engines are mostly supercharged with exhaust gas turbochargers, with the aim of maximizing the use of exhaust gas energy. This is because the energy taken away from the exhaust after the oil of the large diesel generator set is combusted, which is equivalent to 35% 40% of the heat energy developed by the fuel oil, so that these energies are further expanded and utilized in the turbine, which is equal to the combustion heat energy of the diesel fuel to achieve the purpose of supercharging.

Under a certain speed, the size of the torque issued by the diesel generator set is closely related to the density of the mixture in the cylinder, improve the intake pressure of the large diesel generator set, increase the air intake volume of the cylinder, and increase the amount of fuel injection accordingly, you can increase the torque and power of the diesel generator set (generally the power can be increased by 30% 100%) under the condition that the basic structure changes little, and due to the increase in the density of the mixture, the combustion is improved, so that the exhaust pollution and fuel consumption rate can be reduced (the general fuel consumption can be reduced by 3% 10%)。 This method is commonly known as the reinforcement of large diesel generator sets, and has been widely used for high-power large diesel generator sets.

How turbochargers work:

The inertia impulse of the exhaust gas discharged by the engine is used to push the turbine in the turbine chamber, and the turbine drives the coaxial impeller, and the impeller presses the air sent by the air filter duct 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 can burn more fuel, and the corresponding increase in fuel volume and adjust the speed of the engine can increase the output power of the engine.

First of all, let's talk about the general structural principle of the turbocharger, the exhaust gas turbocharger is mainly composed of a pump wheel and a turbine, and of course some other control elements. The pump wheel and the turbine are connected by a shaft, that is, the rotor, and the exhaust gas discharged from the engine drives the pump wheel, which drives the turbine to rotate, and the turbine rotates to pressurize the air intake system. The supercharger is installed on the exhaust side of the engine, so the working temperature of the supercharger is very high, and the speed of the rotor is very high when the supercharger is working, which can reach more than 100,000 revolutions per minute, such a high speed and temperature make the common mechanical needle roller or ball bearing unable to work for the rotor, so the turbocharger generally adopts a full floating bearing, which is lubricated by oil, and the coolant cools the supercharger.

Previously, turbochargers were mostly used in diesel engines, and now some gasoline engines also use turbochargers. Because gasoline and diesel are not burned in the same way, the engine uses a different form of turbocharger.

A gasoline engine is different from a diesel engine in that it is not air that enters the cylinder, but a mixture of gasoline and air, which is prone to deflagration if the pressure is too high. Therefore, the installation of a turbocharger must avoid deflagration, and there are two related issues involved, one is the control of high temperatures and the other is the control of ignition time. After mandatory supercharging, the temperature and pressure of the gasoline engine during compression and combustion will increase, and the deflagration tendency will increase.

In addition, the exhaust temperature of the gasoline engine is higher than that of the diesel engine, and it is not appropriate to increase the valve overlap angle (the time when the intake and exhaust valves are opened at the same time) to strengthen the cooling of the exhaust, and reducing the compression ratio will cause insufficient combustion. In addition, the speed of the gasoline engine is higher than that of the diesel engine, and the air flow rate changes greatly, which can easily cause the turbocharger to lag behind. In view of a series of problems in the use of turbochargers in gasoline engines, engineers have made targeted improvements one by one, so that gasoline engines can also use exhaust gas turbochargers.

Diesel vehicles are generally turbocharged with exhaust gases, and the exhaust gas is used to drive the impeller to play a supercharging role.

1. The pressure increase is different.

Diesel engine turbocharger: Diesel supercharging is higher than supercharging gasoline supercharging pressure.

Turbocharger for gasoline engines: Gasoline supercharging is lower than diesel supercharging.

2. The supercharger is different.

Diesel engine turbochargers: Turbochargers rotate at a slower speed and increase coolant intensity lower than gasoline engine turbochargers.

Turbocharger of gasoline engine: The speed of gasoline engine is higher than that of diesel engine, the air flow rate is fast and the range of variation is large, and the turbocharger has higher requirements.

The structure is roughly the same, but the working conditions and matching methods are different.

The purpose of using a turbocharger in the engine is to burn the same oil and increase the engine power, which is to save fuel.

Working principle of supercharged diesel engine:

The air entering the engine cylinder is compressed in advance to increase the pressure of the air entering the cylinder, so that the filling quality increases, and with the proper cooperation of the oil supply system, more fuel can be injected to make more fuel burn well, so as to improve the power of the diesel engine, improve the specific power, improve the fuel economy, reduce the exhaust emission and noise.

Pressurization: The air entering the cylinder of the diesel engine is pre-compressed through the compressor mechanism (supercharger) to increase the inlet pressure and increase its density.

Intercooling: The pressurized air is cooled by an intercooler to reduce the temperature and increase its density. Such an engine is called a supercharged intercooled engine.

The correct answer is that the piston is connected to the curved shaft through the connecting rod; The cylinder head is equipped with intake and exhaust valves and fuel injectors. The intake and exhaust valves are driven by the valve mechanism, and the fuel injector is controlled by the fuel supply device.

The fuel is injected into the cylinder through the injector and meets the high-temperature and high-pressure air, and the combustion expands to work. The piston needs to go through four strokes of reciprocating liquid before the diesel engine can complete a working cycle of air intake, compression, combustion expansion and exhaust. This is how the four-stroke diesel engine works continuously, converting the thermal energy generated by diesel combustion into mechanical energy.

Hello! Both gasoline engines and diesel engines are internal combustion engines, and their working principles have similarities and differences. Similarities:

Both gasoline and diesel engines produce energy by burning fuel, which drives the engine. Both are four-stroke engines, i.e., the four processes of suction, compression, burst, and exhaust. Differences:

The fuel of gasoline engine and diesel engine is different, gasoline engine uses gasoline, and diesel engine uses diesel. In terms of combustion mode, the gasoline engine uses the ignition next to the ignition to ignite the mixed gas, while the diesel engine injects the fuel into the high-temperature and high-pressure cylinder through the high-pressure injector to make it spontaneously combustible. Therefore, the compression ratio of diesel engines is higher than that of gasoline engines, and the efficiency is also higher.

In addition, the fuel of a diesel engine is compressed and spontaneously combusted, so there is no need for an igniter or the coordination of the ignition system, while the cooperation of the ignition is required for the gasoline transport machine. In general, gasoline engines and diesel engines have some similarities and differences in their working principles, but both generate energy by burning the clap noise to drive the engine.

Summary. The working principle of the gasoline engine: the gasoline engine directly inputs the smallest molecular combustion gas into the cylinder, compresses the fuel-air mixture through the piston on the cylinder, and the hot gas formed after combustion expands to promote the piston movement, and forms 4 cycles with the movement of the crankshaft to complete a cycle, so as to achieve the working effect of the gasoline engine engine.

The working principle of diesel engine: the diesel engine is to put hydrocarbon fuel into the combustion chamber under pressure, generate high-temperature gas in combustion, promote the movement of the piston, and form 4 cycles with the movement of the crankshaft to complete a cycle, so as to achieve the working effect of the engine. Compared with gasoline engines, diesel engines have higher fuel combustion efficiency.

Why can the drive shaft of a gasoline car be moved by hand after manual parking?

The working principle of the gasoline engine: the gasoline engine directly inputs the smallest molecular combustion gas into the cylinder, compresses the fuel-air mixture through the piston on the cylinder, and the hot gas expansion formed after combustion pushes the piston to move, and forms 4 cycles with the movement of the crankshaft to complete a cycle, so as to achieve the working effect of the gasoline engine engine. How diesel engines work:

The diesel engine is to put the hydrocarbon fuel into the combustion chamber under pressure, and the high-temperature gas is generated in the combustion trembling, which pushes the piston to move and form 4 cycles with the movement of the crankshaft to complete a cycle, so as to achieve the working effect of the engine. Compared with gasoline engines, diesel engines have higher fuel combustion efficiency.

After the diesel car is manually parked, the drive shaft cannot be moved by hand.

It is likely that there is a problem with the clutch or gearbox, and the power is interrupted by the output, so the transmission shaft Changqing will not turn, the vehicle will not go, the clutch plate is thin, or the direct bad Fengxun is good, the engine power is too silver and lead does not come, and then the gearbox is broken by a shaft, or the gearbox is broken and the power cannot be transmitted, so the transmission shaft does not rotate.

Summary. The principle of gasoline and diesel engines is roughly the same, their power comes from the mixture of fuel and air in the cylinder, which ignites and breaks out to push the piston, and rotates the crankshaft through the transmission of the connecting rod.

The principle of gasoline and diesel engines is roughly the same, and their power comes from the fuel state mixed with air, which pushes the piston after the fire breaks out in the cylinder, and the crankshaft rotates through the transmission tape of the connecting rod.

The diesel engine is a high-pressure internal emblem machine, which is slightly different in structure compared to the gasoline engine. The oil and air of a gasoline engine are mixed through a carburetor before entering the cylinder, and the gas mixture entering the cylinder requires an electric spark to ignite and explode. In the diesel engine, the mixture is compressed and burns by itself, and no electric spark is used to produce fire, so the fuel and air of the diesel engine are mixed directly in the cylinder.

When the cylinder is full of air, the temperature after compression can reach 500-600, and the high-temperature air in the diesel and the cylinder can burn and expand if they are in contact with each other, so the diesel engine is not slag and needs a carburetor and ignition device.

When the engine is in an extremely cold state and the frustration in the cylinder fails to reach the diesel ignition point, the resistance of the glow plug can make the mixture ignite. When the temperature of the combustion chamber rises to a certain level, the glow plug is turned off, that is, the current is cut off after the engine starts. The shape of the glow plug is similar to that of the spark plug of a gasoline engine, except that the glow plug has a hair coil that heats up when a current of 6-12 volts passes through the coil.

The compression ratio of a gasoline engine is mostly 4:1 8:1, and the average pressure is kilograms square centimeters.

Diesel engines have compression ratios of up to 12:1 18:1.

Fuel consumption is low. Diesel is lower than gasoline**, so diesel engines are a bit more economical. Equal amounts of diesel and gasoline are used on both engines, and diesel engines do twice as much work as gasoline engines.

The exhaust smoke of diesel engine is larger than that of gasoline engine, but the working efficiency of diesel engine is not affected by changes in external climatic conditions. The fuel and air mix ratio of a gasoline engine is usually i:12-1:

16, but there is no strict standard for the mixing ratio of fuel and air for diesel engines.

Thank you. Upper dead end, noun explanation.

The so-called top dead center is when the top of the piston is at the highest position of the index during the upward operation of the engine piston. Once the piston is trapped in this highest position, the piston will start to play and think.

Crank radius (r).

Crank radius: The distance between the center of rotation of the crankshaft and the center of the crank pin is called the crank radius, which is generally represented by R.