What is the way the engine is formed

Because diesel has a lower flammability than gasoline, diesel engines do not need to be ignited, and diesel can be burned by high pressure.

The oil engine sucks pure air in the intake stroke. When the compression stroke is nearing the end, the diesel fuel is injected with the oil pressure to more than 10MPa, injected into the cylinder through the injector, and mixed with the compressed high-temperature air in a very short time to form a combustible mixture. Due to the high compression ratio of the diesel engine (generally 16-22), the air pressure in the cylinder can reach at the end of compression, and the temperature is as high as 750-1000K (while the mixture pressure of the gasoline engine at this time will be 600-700K), which greatly exceeds the autoignition temperature of diesel.

Therefore, after the diesel fuel is injected into the cylinder, it mixes with the air in a very short time and immediately ignites and burns on its own. The air pressure in the cylinder rises sharply to 6-9MPa, and the temperature also rises to 2000-2500K. Driven by high-pressure gas, the piston moves downward and drives the crankshaft to rotate and work, and the exhaust gas is also discharged into the atmosphere through the exhaust pipe.

The diesel engine uses the compression stroke to compress the mixture of fuel and air to the point that the temperature rises to its ignition point, and the combustion achieves the purpose of ignition combustion.

Four-stroke [If you have a problem with the car, ask the car master. 4S shop professional technician, 10 minutes to solve. 】

The basic working principle of a car engine is to convert thermal energy into kinetic energy:

1. First of all, under the action of external force (driven by the starter), the piston is driven by the crankshaft for reciprocating motion, and once the cylinder is working, it can work independently from the external force.

2. When the piston moves from the top dead center to the bottom dead center, the intake valve opens and begins to realize the air intake (the gasoline car enters the mixture, and the diesel engine enters the pure air) - air intake.

3. When the piston moves from the bottom dead center to the top dead center, the intake and exhaust valves are closed, compressing the intake air just now, and generating high temperature --- compression.

4. At the end of compression, the mixed 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 piston to work --- downward.

5. When the piston moves from the bottom dead center to the top dead center, the exhaust valve is opened for exhaust and the next cycle is prepared.

The working principle is divided into, air intake, compression, work, and exhaust.

Here's how a car engine works.

What is the principle of this engine?

Energy conversion, which converts thermal energy into mechanical energy.

The working principle of automobile engine is that the piston does reciprocating linear motion in the cylinder, and the crankshaft is pushed to rotate through the connecting rod.

The piston moves from the top dead center to the bottom dead center driven by the crankshaft, the intake valve is opened, the exhaust valve is closed, and the piston moves downward, so that the upper volume increases to form a certain vacuum, and the external gas forms a mixture with gasoline through the air filter, and enters the cylinder through the valve, and the piston reaches the bottom dead center and stops the air intake.

At the end of the intake, the piston moves up from the bottom dead center driven by the crankshaft, the intake and exhaust valves are closed, the piston moves up, and the gas mixture is compressed to form a combustible mixture.

At the end of the compression stroke, the spark plug releases an electric spark to ignite the combustible mixture, and the rapid combustion produces a high-temperature and high-pressure gas to push the piston downward, and does work outward through the crankshaft connecting rod until it moves to the bottom dead center, the work is finished, the exhaust valve is opened, and the piston moves upward under the drive of the crankshaft, the exhaust gas is discharged, and the exhaust stroke ends. It's a work cycle.

1. Change the oil and oil filter element regularly.

As the oil passes through the pores of the oil filter, solids and sticks in the oil accumulate in the filter. If the filter is clogged, the oil will not pass through the filter element smoothly, and the filter element will be burst or the safety valve will be opened, and the bypass valve will pass through, bringing dirt back to the lubrication area, which will accelerate the wear of the engine and increase the internal contamination.

2. Keep the crankcase well ventilated.

Airborne contaminants can be deposited around the PCV valve and can clog the valve. If the PCV valve is blocked, the polluted gas will flow into the air filter in reverse, and the polluting filter element will reduce the filtration capacity, and the inhaled mixture will be too dirty, which will cause more pollution of the crankcase, resulting in increased fuel consumption, increased engine wear, and even damage to the engine. Therefore, it is necessary to maintain the PCV regularly to remove contaminants around the PCV valve.

3. Clean the crankcase regularly.

During the operation of the engine, the oxides of high-pressure unburned gas, acid, water, sulfur and nitrogen in the combustion chamber enter the crankcase through the gap between the piston ring and the cylinder wall, and mix with the metal powder produced by the wear of the parts to form sludge. When the amount is small, it is suspended in the oil, and when the amount is large, it is precipitated from the oil, blocking the filter and oil holes, causing difficulty in engine lubrication and causing wear.

In addition, the oxidation of the engine oil at high temperature will produce paint film and carbon deposits that will stick to the piston, which will increase the fuel consumption of the engine and decrease the power, and in serious cases, the piston ring will be stuck and the cylinder will be pulled. Therefore, the crankcase is regularly cleaned with BGL05 (Lubrication System Efficient and Fast Cleaning Agent) to keep the inside of the engine clean.

"Automobile engines are divided into gasoline engines and four-stroke diesel engines, the working principles of the two are: the working principle of gasoline engine (gasoline engine): four-stroke gasoline engine is to mix air and gasoline in a certain proportion into a good mixture, which is sucked into the cylinder in the suction stroke, and the mixture is compressed and ignited to produce heat energy, and the gas of high temperature and high pressure acts on the top of the piston to promote the piston to reciprocate linear motion.

The automobile engine is the device that provides power for the car, is the heart of the car, and determines the power, economy, stability and environmental protection of the car. According to different power**, automobile engines can be divided into diesel engines, gasoline engines, electric vehicle motors, and hybrids.

Common gasoline engines and diesel engines belong to reciprocating piston internal combustion engines, which convert the chemical energy of fuel into mechanical energy of piston movement and output power to the outside world.

The gasoline engine has high speed, small quality, low noise, easy starting, and low manufacturing cost; The diesel engine has a large compression ratio, high thermal efficiency, and better economic performance and emission performance than the gasoline engine.

The engine is the power source of the car. Automobile engines are mostly thermal power units, referred to as heat engines. The heat engine converts the heat energy generated by fuel combustion into mechanical energy with the help of the state change of the working fluid.

Technological development:

With the development of science and technology, the arrival of automobiles has made our lives convenient and fast.

Here's how a car engine works.

The engine generates heat energy by circulating a mixture of gasoline and air. Combustion takes place in a closed cylindrical space (combustion chamber), which can change its volume by the movement of the pistons. Thermal energy creates high pressure in the combustion chamber, from :

A force is applied to the boundary surfaces (combustion chamber walls, combustion chamber roof and piston), which causes the piston to move.

1. The working principle of the external combustion engine: when a large amount of coal combustion produces heat energy to heat water into a large amount of water vapor, high pressure is generated, and then this high pressure pushes the machinery to do work, thus completing the transformation of heat energy to kinetic energy.

2. The working principle of the internal combustion engine: the piston internal combustion engine mixes fuel and air and burns it in its cylinder, and the heat energy released makes the cylinder produce high-temperature and high-pressure gas. The gas expansion pushes the piston to do work, and then outputs the mechanical work through the crank connecting rod mechanism or other mechanisms to drive the driven machinery to work.

3. The working principle of jet engine: the fuel and oxidizer react in the combustion chamber to release heat energy, and then the heat energy is converted into the function of adjusting the air flow in the nozzle.

Extended Materials. Internal combustion engine cooling method: Internal combustion engine can be divided into water-cooled engine and air-cooled engine according to different cooling methods. Water-cooled engines are cooled by using coolant circulating in the cylinder block and cylinder head cooling jacket as a cooling medium.

Air-cooled engines, on the other hand, use the air flowing between the cylinder block and the heat sink on the outer surface of the cylinder head as a cooling medium for cooling. Water-cooled engines cool evenly, work reliably, and have good cooling effect, and are widely used in modern vehicle engines. Hope!

The engine consists of a cooling system with an oil supply system. Lubrication system, valve mechanism. The crankshaft is composed of a mechanism, the working principle is that the suction and explosion discharge is a working cycle, called four strokes, the piston goes down to suction, up, compression, oil supply ignition eruption piston goes down to do work, and the piston goes up to exhaust to complete a working cycle.

1.The two major mechanisms are: crank connecting rod mechanism and gas distribution mechanism.

Crank connecting rod mechanism: It is composed of a body group, a piston connecting rod group and a crankshaft flywheel group.

Valve train: It is composed of a valve group, a valve train group and a valve actuation group.

2.The five major systems are: supply system, cooling system, lubrication system, starting system, and ignition system.

The main components of the engine are: Cylinders and pistons, the principle of combustion occurs by compressing air and oil mist. Thus generating momentum.

Keep working. The compression process of a gasoline engine. Mainly a mixture of oil mist that ignites air and oil through a spark plug.

Diesel engines work by compressing to produce combustion.

An engine is a machine that can convert other forms of energy into mechanical energy, such as internal combustion engines (gasoline engines, etc.), external combustion engines (Stirling engines, steam engines, etc.), electric motors, etc. For example, the internal combustion engine usually converts chemical energy into mechanical energy. An engine applies to both a power generation unit and an entire machine including a power unit (e.g

gasoline engines, aero engines). The engine was first born in England, so the concept of the engine is also derived from the English language, and its original meaning refers to the "mechanical device that generates power" and wants to work for you.

Causes of abnormal tire noise while driving:

Low-speed driving emits a rhythmic humming sound, and high-speed driving noise is reduced. Cause of failure: The four-wheel alignment of the vehicle is inaccurate, and the long-distance driving has great wear on the tires, and the tires form eccentric wear and make abnormal noises.

Troubleshooting: Touch the tread of the tire with your hand, if you can feel the unevenness of the tread on the inside or outside.

The abnormal sound of low-speed driving is not obvious, and the high-speed driving emits a uniform humming sound. Cause of failure: This phenomenon occurs when one of the wheel bearings of the vehicle is damaged.

Long-distance driving has high requirements for the bearings of the wheels, and the bearings will be damaged due to fatigue if the quality is not good or has been used for a long time under long-term high-speed operation**.

The working principle of the engine is: 1. Four-stroke gasoline engine: The working cycle of the four-stroke gasoline engine is composed of four piston strokes, namely intake stroke, compression stroke, power stroke and exhaust stroke.

2. Four-stroke diesel engine: The working principle of four-stroke diesel engine is the same as that of four-stroke gasoline engine, which is also composed of four strokes: air intake, compression, work and exhaust. The difference is that the intake stroke of the diesel engine is pure air, and when the compression stroke is close to the top dead center, the diesel fuel is injected into the combustion chamber by the injector.

3. Two-stroke engine: There are three holes on the engine cylinder block, namely the air intake hole, exhaust hole and air exchange hole, which are closed by the piston at a certain time.

1. Function: The engine is a machine that converts the energy of a certain type into mechanical energy, and its function is to convert the chemical energy of liquid or gas combustion into heat energy after combustion, and then convert the heat energy into mechanical energy through expansion and output power. The engine is a complex machine composed of many structures and systems, and its structural types are varied, but because the basic working principle is the same, its basic structure is similar, and the overall structure of the engine is shown below.

Gasoline engine:

Diesel engine:

2. Structure. (1) Crank connecting rod mechanism.

The crank connecting rod mechanism is composed of cylinder block, cylinder head, piston, connecting rod, crankshaft and flywheel. This is when the engine generates power and converts the linear reciprocating motion of the piston into a rotary motion of the crankshaft and outputs power to the outside.

2) Gas distribution mechanism.

The valve train is composed of intake valves, exhaust valves, valve springs, tappets, camshafts and timing gears. Its function is to charge the fresh gas into the cylinder in time, and discharge the exhaust gas generated by combustion out of the cylinder in time.

3) Fuel supply system.

a. Due to the different fuels used, it can be divided into gasoline engine fuel supply system and diesel engine fuel supply system.

B, gasoline fuel supply system and differentiation of oil tank type and fuel direct injection type, usually used carburetor type fuel supply system by fuel tank, gasoline pump, gasoline filter, carburetor, air filter, intake and exhaust manifold and exhaust muffler, etc., its role is to supply the cylinder has been equipped with combustible mixture, and control the amount of combustible mixture into the cylinder, in order to adjust the engine output power and speed, finally, the exhaust gas after combustion is discharged out of the cylinder.

c. The diesel engine fuel supply system is composed of fuel tank, fuel pump, fuel injection pump, diesel filter, intake and exhaust pipe and exhaust muffler, etc., which is used to supply pure air to the cylinder and inject quantitative diesel into the cylinder at the specified time to adjust the engine output power and speed, and finally, discharge the exhaust gas out of the cylinder after combustion.

4) Cooling system.

Motor vehicles are generally water-cooled. The water-cooled type is composed of a water pump, a radiator, a fan, a thermostat and a water jacket (in the body), etc., and its function is to use the circulation of cooling water to dissipate the heat of high-temperature parts into the atmosphere through the radiator, so as to maintain the normal working temperature of the engine electric.

5) Lubrication system.

The lubrication system is composed of an oil pump, a filter, an oil channel, an oil pan, etc. Its function is to distribute the lubricating oil to the friction surface of each relatively moving part to reduce friction, slow down the wear of the parts, and clean and cool the friction surface.

6) Ignition system.

The ignition system of gasoline engine is composed of power supply (battery and generator), ignition coil, distributor and spark plug, etc., and its function is to ignite the compressed combustible mixture in the gas cylinder at the specified time and time.

7) Starting system.

The starting system consists of a starter and a starting relay, which is used to start a stationary engine and turn it into a self-running state.