The steps of engine work are divided into air intake work done ?

1. The steps of engine work are divided into air intake, (compression) and work.

Exhaust) 2, 1, intake stroke.

The intake valve opens, the exhaust valve closes, the piston moves from top dead center to bottom dead center, and the cylinder volume above the piston increases, creating a vacuum.

The pressure in the cylinder drops below the inlet pressure, and under the action of vacuum suction, it passes through the carburetor.

or gasoline injected by an atomized gasoline, mixed with air to form a combustible mixture, which is sucked into the cylinder by the intake tract and intake valve. The intake process continues until the piston passes the dead center and the intake valve closes. Then the ascending piston begins to compress the gas.

2. Compression stroke.

The intake and exhaust valves are all closed, the combustible mixture in the cylinder is compressed, the temperature of the mixture rises, and the pressure rises. Before the piston approaches the top dead center, the pressure of the combustible mixture rises to about 0 6 1 2MPa, and the temperature can reach 330 430.

3. Work itinerary.

A spark plug mounted above the cylinder head when the compression stroke is close to the top dead center.

An electric spark is emitted to ignite the compressed combustible mixture. After combustible mixture combustion, a large amount of heat is released, and the gas pressure and temperature in the cylinder rise rapidly, the maximum combustion pressure can reach 3 6MPa, and the maximum combustion temperature can reach 2 200 2 500. The high-temperature and high-pressure gas pushes the piston to move quickly to the dead center and pass through the crank connecting rod mechanism.

Externally meritorious service. At the beginning of the work stroke, the intake and exhaust valves are closed.

4. Exhaust stroke.

Towards the end of the work stroke, the exhaust valve opens, because the pressure in the cylinder is higher than the atmospheric pressure.

The hot exhaust gases are quickly discharged from the cylinder, and this stage is a free exhaust phase, where the hot exhaust gases are discharged through the exhaust valve at the local speed of sound. With the exhaust process to enter the forced exhaust stage, the piston moves over the bottom dead center to the top dead center, and the exhaust gas in the cylinder is forcibly discharged, and the exhaust process ends when the piston reaches the vicinity of the top dead center. At the end of the exhaust, the gas pressure in the cylinder is slightly higher than the atmospheric pressure, about 0 105 0 115MPa, and the exhaust gas temperature is about 600 900.

Because the combustion chamber occupies a certain volume, it is impossible to completely remove the exhaust gas at the end of the exhaust, and the remaining part of the exhaust gas is called residual exhaust gas.

Four-stroke gasoline engine.

After four strokes of air intake, compression, work and exhaust to complete a working cycle, in this process, the piston reciprocates up and down four strokes, and the corresponding crankshaft.

Rotate for two weeks.

Hello, the working steps of the engine are divided into air intake, compression, work, and discharge. Hope mine can help you, thanks.

The steps of engine work are divided into air intake, compression, work and exhaust.

Enter, press, do, row. To do it is to ignite the fire.

1. During the working process of the engine, when the piston descends from the top dead center to the bottom dead center in the intake stroke, it is open, and the exhaust valve is closed.

2. When the piston completes the first stroke and goes up after going down, it is called the compression stroke when it reaches the top dead center, at this time the intake and exhaust valves are closed before the trouser tracks, and then the piston will continue to go down to the bottom dead center, at this time the state is called the power stroke, and the valve is still closed.

3. When the work is finished, the piston goes up to the top dead center point called the exhaust stroke, at this time the intake valve is closed, and the exhaust valve is open.

Working process: air intake - compression - fuel injection - combustion - expansion work - exhaust.

The working fluid that enters the cylinder is pure air. Due to the less resistance of the diesel engine intake system, the pressure at the end of the intake air is pa= (, which is higher than that of the gasoline engine. The intake terminal temperature ta=300 340K, which is lower than that of a gasoline engine.

The cylinder working volume refers to the volume of gas swept by the piston from top dead center to bottom dead center, also known as single cylinder displacement, which depends on the cylinder bore and piston stroke.

Engine displacement is a very important engine parameter, it is more representative of the size of the engine than the bore and number of cylinders, and many indicators of the engine are closely related to the displacement volume. In general, the larger the displacement, the greater the engine output.

First of all, under the action of external force (driven by the starter), the piston is driven by the crankshaft to reciprocate, once the cylinder is working, it can be separated from the external force and work on its own, when the piston moves from the top dead center to the bottom dead center, the intake valve is opened, and the air intake begins to be realized (the gasoline car enters the mixture, and the diesel engine enters the pure air).

At the end of compression, the mixture gas of the gasoline vehicle is ignited and burned under the action of the spark plug, and the high-temperature gas of the diesel vehicle is injected under the action of the injector and burns by itself, and the gas in the cylinder expands sharply under the action of combustion, which promotes the work under the piston.

When the piston moves from bottom dead center to top dead center, the exhaust valve opens to exhaust and prepares for the next cycle.

Introduce a combustible mixture (or fresh air) into the cylinder; The combustible mixture (or fresh air) entering the cylinder is then compressed, and the combustible mixture is ignited when the compression is near the end point (or the diesel fuel is injected into the cylinder at high pressure to form a combustible mixture and ignited); The combustible mixture is ignited and burned, and the expansion pushes the piston down to achieve external work; Finally, the exhaust gases after combustion are discharged. That is, the four processes of air intake, compression, work and exhaust.

To ask this question, you should explain the engine situation in advance, such as diesel engine or gasoline engine, and how many cylinders there are.

Four-stroke engine: intake compression and exhaust.

According to the working mode of the air intake system, it can be divided into four types: naturally aspirated, turbocharged, mechanically supercharged and double supercharged.

The engine is a machine that converts chemical energy into mechanical energy, and its conversion process is actually the process of the work cycle, simply put, it is through the combustion of fuel in the cylinder, generating kinetic energy, driving the reciprocating motion of the piston in the engine cylinder, thereby driving the connecting rod connected to the piston and the crank connected with the connecting rod, making a reciprocating circular motion around the center of the crankshaft, and outputting power.

1. Body: It is the assembly base of each part of the engine. It includes the cylinder head, cylinder block, lower crankcase (oil pan). The cylinder head and the inner wall of the cylinder block together form part of the combustion chamber. Many parts of the body are part of other systems.

2. Crank connecting rod mechanism: It is a mechanism used by the engine to generate and transmit power, through which the linear reciprocating motion of the piston is transformed into the rotary motion of the crankshaft and output power. It includes pistons, piston pins, connecting rods, crankshafts with flywheels, and cylinder blocks, among others.

4. Fuel supply system: The fuel supply system of gasoline engine includes gasoline tank, gasoline pump, gasoline filter, air filter, carburetor, intake pipe, exhaust pipe, exhaust muffler, etc. Its function is to mix gasoline and air into a suitable combustible mixture and supply it to the cylinder for combustion, and exhaust the exhaust gases generated by combustion out of the engine.

5. Cooling system: mainly including water pump, radiator, phoenix fan, water distribution pipe, cylinder block and water jacket in the cylinder head. Its function is to dissipate the heat of high-heat parts into the atmosphere to ensure the normal operation of the engine.

6. Lubrication system: including oil pump, pressure limiting valve, lubricating oil channel, filter collector, oil filter and oil radiator, etc. Its function is to supply lubricating oil to the friction parts to reduce the friction resistance between them, reduce the wear of the parts, and partially cool the friction parts and clean the friction surface.

7. Starting system: including the starting mechanism of the engine and its auxiliary devices.

According to the different intake conditions, it can be divided into two categories: supercharged engines and naturally aspirated engines. Supercharged engine can be used without increasing engine displacement, greatly improve engine power, so the application is more and more extensive, it can be divided into mechanical supercharging and exhaust gas turbocharging two, now diesel engines are generally supercharged, gasoline engines are also popular.

Today's passenger cars are generally used in water-cooled, four-stroke, reciprocating piston type, small-displacement turbocharged, in-line three- or four-cylinder gasoline engines, and luxury cars may use engines with more than six cylinders.

In large and medium-sized buses, trucks and various construction machinery, water-cooled, four-stroke, reciprocating piston engines, turbocharged, in-line four-cylinder or six-cylinder diesel engines are generally used, and a small number of models with special requirements use air-cooled or two-stroke engines.

According to the different arrangement of cylinders, it can be divided into two types: single-row type (in-line type) and double-row type (V-type, W-type, horizontal opposite). Generally, the number of cylinders below six cylinders is made into an in-line type, and in order to shorten the engine length in passenger cars, the six-cylinder engine will also be made into a V-shape; The V-engine has a ° difference.

This angle refers to the angle between the two rows of cylinders, commonly used is 60 ° and 90 °, 15 ° angle mainly refers to Volkswagen's VR6 engine, the two VR6 engines are welded together at a certain angle, it becomes Volkswagen's W12 engine.

The 75° angle is generally used for V10 engines; If the angle between the two cylinders is leveled at 180°, it becomes a boxer engine, which is still used by Subaru and Porsche.

According to the working mode of the air intake system, the engine can be divided into four types: naturally aspirated, turbocharged, mechanically supercharged and double supercharged.

According to the working mode of the air intake system, the engine can be divided into two types: naturally aspirated engine and turbocharged engine, and the turbocharged engine is often represented by the letter T.

The cooling methods of the engine are generally divided into water cooling, air cooling, and water cooling and air cooling at the same time.

1.According to the stroke classification of the engine, it can be divided into two-stroke engine and four-stroke engine.

2.Classified by the number of cylinders in the engine; It can be divided into 1, 2, 4, 6, 8, 10, 12, 16 and other cylinder engines.

3.Classified according to the arrangement of the cylinders of the engine; It can be divided into single-column and double-column.

4.Classification according to the fuel used in the engine; It can be divided into gasoline engine and diesel engine.

The mode of operation refers to the characteristics of this engine, which are divided into: naturally aspirated, turbocharged, supercharged and dual-supercharged. 1. There is no need to explain the natural inhalation, which is to use negative pressure to suck air into the engine independently.

2. Turbocharging uses exhaust gas from exhaust to drive the turbine and force air into the cylinder. 3. Mechanical supercharging means that the engine directly outputs a transmission shaft to connect to the supercharger and forcibly presses air into the cylinder. 4. Mechanical + turbocharging, as the name suggests, is a base rubber engine containing these two forms of supercharging.

Folding this section of the fault next to the car engine water temperature is too high solution: 1. After the car is warmed, check the water return pipe at the upper end of the antifreeze water storage tank, if the water return is not smooth or blocked, the water temperature will be too high. Reminder:

Do not blindly disassemble and replace parts in maintenance. 2. Check whether there is too much dust between the condenser and the water tank, and clean it thoroughly with high-pressure gas to ensure that the water tank and the condenser have good heat dissipation performance. Reminder:

Pay attention to wipe the dust between the condenser and the water tank. 3. When the car is hot, check the temperature difference between the upper and lower water pipes of the water tank, if the temperature difference is too large, you need to check the opening of the thermostat and whether the water pump has a fault of speed loss. Reminder:

The temperature difference between the upper and lower pipes of the water tank should not be too large. 4. Due to the non-standard addition and replacement of antifreeze, it will cause the engine waterway and water tank to be blocked in advance, and the water temperature will be high. Antifreeze is changed every two years, and original parts must be used when replacing and adding.

Warm reminder: After adding water to the engine cooling system, or adding antifreeze concentration of more than 60%, it will cause the water temperature to be too high. 5. The high pressure at the high end of the air conditioning system is too high; Excessive filling of air conditioning refrigerant or air conditioning refrigeration lubricant; The self-adjusting function of the internal self-debugging air-conditioning compressor fails, resulting in high pressure; There is also the blockage of the air conditioning condenser, which will increase the load on the engine, consume the heat dissipation performance of the cooling system, and cause the failure of the water temperature to be too high.