What is the control of the four strokes of the automobile engine for suction, compression, work and

Your understanding is not quite right, both suction and compression are done by the inertia of the flywheel, not by the inertia of the crankshaft.

In one stroke, we first look at compression, driven by the inertia of the flywheel, the piston compresses the gas in the cylinder, compresses to the minimum volume, and then the gas temperature rises and ignites. Then the volume expands rapidly, pushing the piston to do work externally, and when expanding, because the piston does work, the kinetic energy lost by the flywheel is compensated, and at the same time, the high-pressure gas pushes open the exhaust valve and exhausts outward.

At this time, the volume in the cylinder increases, the pressure decreases, but the piston is still moving under the drive of the flywheel, the volume continues to increase, the pressure in the cylinder continues to decrease, and finally forms a negative pressure, so the suction valve is pushed open by the internal and external pressure difference, and the oil and air are sucked into the cylinder.

At this time, the flywheel has already turned half a week and continues to rotate, and due to the relationship between the crankshaft, the second half of the flywheel will push the piston to compress the gas. And so a new cycle began.

Large diesel engines can rely on the inertial compressed gas of the flywheel to ignite the gas, but small engines that burn gasoline generally cannot, so when the gas volume is compressed to the minimum, a spark plug must be used to ignite in order to achieve expansion work.

Since the flywheel is stopped when the car starts, it must be ignited to give the initial kinetic energy to the flywheel to start. In the past, the old-fashioned diesel engine would be cranked by hand when it was started. The diesel engine can also be started by going downhill to get the flywheel running.

In addition to doing work, the rest rely on rotational inertia.

Mechanical energy is converted into internal energy.

The suction flush is clear, the intake valve (L) opens, the piston moves downward, the mixture of fuel and air enters the cylinder, and when the piston movement is at its lowest, the intake valve is closed.

When the piston reciprocates in the cylinder, the process of moving from one end of the cylinder to the other end is called a stroke. Ordinary internal combustion engines are mostly four-stroke internal combustion engines.

It is divided into suction stroke, compression stroke, power stroke and exhaust stroke. There are mainly four-stroke gasoline engines.

and four-stroke diesel.

At the end of the compression stroke, the spark plug.

An electric spark is generated, which causes the fuel to burn violently, producing a gas at high temperature and pressure. The high-temperature and high-pressure gas pushes the piston downward and drives the crankshaft.

Turn, do work externally. Among the four strokes, only the power stroke does the work externally, and the other three strokes rely on the inertia of the work stroke to complete the spine argument. Convert internal energy into mechanical energy.

Hello, the energy conversion involved in the suction and exhaust stroke is not obvious, the compression stroke: mechanical energy is converted into internal energy, and the work stroke: internal energy is converted into mechanical energy, I hope my disadvantages can be helpful to you, I wish you a happy life!

1. Air 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.

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.

During this stroke, the intake and exhaust valves remain closed, and when the piston approaches the top dead center, the spark plug is installed in the cylinder block hall or cylinder head.

An electric spark is emitted to ignite the compressed combustible mixture, and when the combustible mixture is burned, a large amount of heat energy is released, and its pressure and temperature increase rapidly. The resulting high temperature, high-pressure gas pushes the piston from top dead center to bottom dead center, passing the connecting rod to the crankshaft.

Rotate and output mechanical energy.

4. Exhaust stroke:

The exhaust gases generated after the combustion of the combustible mixture must be removed from the cylinder for the next working cycle. When the expansion is nearing the end, the exhaust valve is opened, and the exhaust gas is discharged freely by the waste pressure, and when the piston reaches the top dead center and then moves to the top dead center, the exhaust gas is forced to be discharged into the atmosphere.

The same is to do work in the combustion stroke, that is, when the piston reaches the top dead center, if it is a fuel engine, the compressed combustible mixture will be ignited at this time, causing the compressed gas to burn and expand, and pushing the piston to do work. If it is compressed air, the intake valve will be opened, and the high-pressure gas enters the cylinder to push the piston to do work, and the piston steam engine is also this principle, and it is more intuitive to be an old-fashioned steam locomotive, with a huge cylinder on each side, which connects several moving wheels and piston cavity beams through connecting rods to drive the locomotive forward.

The piston moves up and down four times, inhales, compresses, does work, and vents.

Suction: The piston moves downward in the cylinder while the intake valve opens, sucking the mixed oil into the cylinder. until the piston moves to the bottom dead center of the cylinder.

Compression: After sucking up a full cylinder of mixing, the cylinder moves upwards in turn to compress the mixed oil and gas until the mixed oil and gas are compressed into a small space in the upper part of the cylinder. At this point, the piston is at the top dead center of the cylinder. In compression, both the intake and exhaust valves are closed.

Work: When the mixed oil and gas are compressed to the maximum extent, the spark plug ignition ignites the mixed oil and gas. The expansion of the oil and gas combustion volume pushes the piston downward, and this process is the mixing of oil and gas to the piston work.

Exhaust: After the piston is pushed to the bottom dead center, it moves upwards again, which is the exhaust gas open, pushing the combustion exhaust gas out of the cylinder.

Then keep inhaling and so on!

The engine of the car is generally 4-stroke.

The 4 strokes are: intake, compression, combustion, and exhaust.

Understand 4-strokes.

The piston, which consists of a piston rod connected to the crankshaft, is carried out as follows:

1 The piston starts at the top, the intake valve is opened, the piston moves down, and the oil-gas mixture is sucked in 2 The piston moves to the top to compress the oil-gas mixture, making it more powerful.

3 When the piston reaches the top, the spark plug releases a spark to ignite the air-gas mixture, causing the piston to move downward again.

4 The piston reaches the bottom, the exhaust valve opens, the piston moves upward, and the exhaust gas is discharged from the cylinder through the exhaust pipe.

(1) The compression stroke converts the mechanical energy into internal energy, and the power stroke converts the internal energy into mechanical energy;

2) 1200r min=20r s, the flywheel rotates 20 revolutions per second, the internal combustion engine goes through 10 working cycles, and the gas does work on the piston 10 times, so the answer is: compression; 10．

1) Suction stroke: the intake valve opens, the exhaust valve closes, the piston moves downward, and the mixture of gasoline and air enters the cylinder;

2) Compression stroke: both the intake and exhaust valves are closed, the piston moves upwards, and the fuel mixture is compressed;

3) Power Stroke: At the end of the compression stroke, the spark plug.

An electric spark is generated, which causes the fuel to burn violently, producing a gas at high temperature and pressure. The high-temperature and high-pressure gas pushes the piston downward, and the date carries the crankshaft.

Turn, do work externally.

4) Exhaust stroke: the intake valve is closed, the exhaust valve is opened, and the piston moves upwards to discharge the exhaust gas out of the cylinder.

The suction stroke and exhaust stroke valves are opened, and if the valve is opened at the same time the piston moves downward to the suction stroke; If the valve.

Turn on while the piston moves upwards and exhausts the stroke

The compression stroke and power stroke valves are closed, and if the valve is opened at the same time, the piston moves downward to do the power stroke; If the valve is rented rock, the differential door opens while the piston moves upwards to compress the stroke.

You can see the opening form of the intake valve: the suction stroke is to inhale the gas, the compression is to convert the mechanical energy into the internal energy, and you can see the figure whether there is a circular leakage spark, this stroke is to convert the internal energy into mechanical energy, and the exhaust stroke is to discharge the exhaust gas with the town.

Look at its intake valves, exhaust valves, and whether it's up or down.