In a naturally aspirated engine, which parts of the engine enter the cylinder?

Oil supply line: The oil is pumped into the engine by the oil pump through the oil sump through the oil sump, first through the backflow shut-off valve (to prevent the oil from backflowing), into the oil filter (there is a bypass valve here to prevent the oil filter from clogging), and then according to the oil pressure, turn on the oil pressure switch.

At this time, the oil pressure indicator on the dashboard in the car is extinguished), the oil enters the main oil channel, and enters the cylinder head upwards to provide lubrication and force transmission functions for the camshaft and hydraulic tappet; Down into the cylinder block, on the crankshaft.

and bearing lubrication, as well as the opening of the oil nozzle through the pressure accumulator valve, lubricates the piston linkage group, and finally flows back to the oil pan.

Air supply line:

Naturally aspirated engine: Air passes through an air filter.

After filtration, it enters the intake buffer box and passes through the throttle valve.

Previously, it was necessary to flow through the intake pressure sensor or air flow meter for the calculation of the intake volume), enter the intake pipe, then the intake manifold, and enter the cylinder through the intake valve.

Supercharged Engine: The air is filtered by an air cleaner and then enters the low-pressure intake line and passes through the turbocharger.

After pressurization, it enters the intercooler (which cools the charge air), then enters the high-pressure intake line, passes through the throttle valve (previously it needs to flow through the intake pressure sensor to calculate the intake volume), enters the intake pipe, and then enters the intake manifold, and enters the cylinder through the intake valve.

Fuel supply system: gasoline is pumped into the fuel pipeline through the suction filter through the gasoline pump, and after flowing through the gasoline filter and fuel pressure regulator, a part of the fuel is supplied to the fuel rail of the engine and injected into the engine cylinder by the injector; The excess gasoline passes through the pressure regulator and then through the return pipe and flows back to the fuel tank. In addition, because gasoline is volatile, a gasoline vapor pipe is connected to the activated carbon tank at the fuel tank to absorb fuel vapor.

The activated carbon tank is connected to the rear of the throttle valve of the intake pipe through the vacuum pipe, and the vacuum is controlled by the solenoid valve of the activated carbon tank to suck the fuel vapor into the engine for combustion.

The air is filtered by the air filter and enters the intake buffer box, passes through the air flow meter (calculates the air intake, the D-type system is not equipped), then passes through the throttle valve, enters the intake pipe, and then goes to the intake manifold (the D-type system measures the air volume by the intake pressure sensor here), and enters the cylinder through the intake valve.

Because naturally aspirated engine air is sucked into the mixture by the negative pressure generated by the piston downward, the pressure in the cylinder is always less than atmospheric pressure.

After turbocharging, it becomes low-temperature and high-pressure air after intercooling, the density increases, and then flows through the intake valve, at the end of the intake air, what is the pressure of the mixture in the cylinder, is it the same or lower than the pressure before the intake valve? Is the maximum air pressure high or low? What is the exact number? Why is the volumetric efficiency not greater than 1

When the intake stroke of a naturally aspirated engine ends, the pressure is less than the atmospheric pressure; If the engine with turbocharging is greater than the atmospheric pressure;

d is related to the temperature of the incoming gas.

Choose C 1Intake stroke In this stroke, the intake valve is opened, the exhaust valve is closed, the cylinder communicates with the carburetor, the piston moves from the top dead center to the downward karma point, the volume above the piston increases, and a certain vacuum degree is generated in the cylinder. The combustible mixture is sucked into the cylinder.

When the piston reaches the bottom dead center, the crankshaft turns half a circle, the intake valve closes, and the intake stroke ends.

Due to the resistance of the intake tract, the gas pressure in the cylinder at the end of the intake is slightly lower than the atmospheric pressure, which is about. After the mixture gas enters the cylinder, it is in contact with the cylinder wall, piston and other high-temperature parts, and mixed with the high-temperature residual exhaust gas of the previous cycle, so the temperature rises to 370-400K.

During air intake, the suction stroke of the gasoline engine is to enter the gasoline, which causes it to spontaneously ignite by compression.

The diesel engine is a mixture of diesel fuel and air, and the air is used to support combustion.

In gasoline engines, the oil-air mixture enters the cylinder and is ignited by a spark plug near the end of compression. The diesel 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.

Gasoline mixed with air , air.

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5. Fresh air enters the cylinder in the intake and exhaust valve stroke of the engine, and the exhaust gas is discharged in the piston stroke. The concept of engine: An engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc.

For example, the internal combustion engine usually converts chemical energy into mechanical energy. The engine is applied to both the power generation unit and the entire machine including the power unit (e.g., gasoline engine, aero engine).

The engine was first born in England, so the concept of the engine also originated from the English language, and its original meaning refers to the "mechanical device that produces power". <

5. Fresh air enters the cylinder in the stroke of the engine, and the exhaust gas is discharged in the stroke.

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5. Fresh air enters the cylinder in the intake and exhaust valve stroke of the engine, and the exhaust gas is discharged in the piston stroke. The concept of engine: An engine is a machine that can convert other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc.

For example, the internal combustion engine usually converts chemical energy into mechanical energy. The engine can be applied to both the power generation unit and the entire machine including the power unit (e.g., gasoline engine, aero engine).

The concept of the engine is also derived from English, and its original meaning refers to the "mechanical device that generates power". <

Summary. Naturally aspirated engine intake is taken in from the air cleaner and then through the throttle to the intake manifold to the valve, thus entering the engine.

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Intake valves. Naturally aspirated engine intake is taken in from the air cleaner and then through the throttle to the intake manifold to the valve, thus entering the engine.

**There are for sale.

This valve is a one-way valve, and there are two kinds of valves in the car, one is the valve chamber cover, and the other is the brake vacuum.

Brake vacuum. Auto parts city, or sold on the Internet, single conduction valve, the function of the single-pilot valve is to avoid air flow regurgitation. So mainly in the brake vacuum, there are check valves.

There are such valves sold on the Internet, so search for brake vacuum check valves.

**Not expensive, generally about 50 yuan.

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What are the components of an air jet engine with a compressor? and briefly describe the role of each part.

The role of the turbine engine 1, the air intake: the purpose of the orange is to make the air flow into the compressor at a smooth flow rate 2, compressor: through the rotation of the compressor impeller with blades, the pressure of the air increases, the density increases, so as to improve the efficiency of combustion, and at the same time increase the jet speed and increase the thrust.

3. Combustion chamber: Fuel and air are mixed and ignited in this space to do work and provide energy. 4. Turbine in the circle:

It is under the same control as the compressor, and can compress the air flow to drive the compressor to rotate. 5. Tail nozzle: At the tail of the engine, the flow rate of the airflow can be increased through a special structure, the thrust of the engine can be improved, and the thrust direction can be changed by noise reduction.

The principle of turbojet engine is actually the same as that of the common piston engine, which is the four functions of air intake, pressurization, combustion and exhaust, but the biggest difference with the piston engine is that all the functions in the system are operated simultaneously and continuously.

Normally aspirated is a type of car air intake, which is a form of atmospheric pressure that presses air into the combustion chamber without passing through any supercharger.

Naturally-aspirated engines are far superior to supercharged engines in terms of smoothness of power delivery and directness of response, as exemplified by the current V8 F1 engine. 、

Natural aspiration features:

1) Naturally aspirated does not burn oil as much as turbocharging.

2) The maintenance cost of naturally aspirated is much lower than that of turbocharging.

3) The naturally aspirated air is very smooth during acceleration, and the throttle response is timely, while there is a delay in turbocharging.

4) Theoretically speaking, naturally aspirated is more resistant to opening, and the service life is generally longer than that of turbocharging.

Naturally aspirated and turbocharged meaning:

1) Naturally aspirated: It is a type of car air intake, which is a form of atmospheric pressure pressing air into the combustion chamber without passing through any supercharger.

2) Turbocharging: It is a technology that uses the exhaust gases generated by the operation of an internal combustion engine to drive an air compressor.

Naturally aspirated engine: generally refers to a naturally aspirated engine, which is a type of air intake in automobiles.

Refers to the fact that the engine intake air has not been supercharged (such as turbocharged and mechanically supercharged).

yes, isn't it the suction stroke of the engine?

5. The fuel consumption of the naturally aspirated engine is relatively lower. Even if the fuel consumption is equal, the naturally aspirated engine does not have high requirements for oil products, which indirectly reduces the cost of car maintenance.

A naturally aspirated engine is one of the engine intake methods that uses atmospheric pressure to force air into the combustion chamber without passing through any supercharger, thus providing power to the vehicle.

Differences: 1. In the process of air intake, the suction stroke of the gasoline engine is to enter the gasoline and make it spontaneously combust through compression.

2. The diesel engine is a mixture of diesel and air, and air is used to support combustion.

Difference Between Gasoline Engine and Diesel Engine:

1. The diesel engine burns diesel, and the gasoline engine burns gasoline.

Second, the gasoline engine is electronically ignited, and the diesel engine is ignited by pressure.

3. The power of the diesel engine of the car with the same displacement is large, and the power of the gasoline engine is small.

Fourth, the noise of the gasoline engine is less than that of the diesel generator of the same displacement.

5. Diesel engines of the same displacement are generally more fuel-efficient than gasoline engines.

Advantages and disadvantages of gasoline and diesel engines:

1. The diesel engine is compressed atomization and burst combustion. Gasoline engines work easily and at a low cost.

2. Gasoline is more expensive than diesel and has many failures. The cost of diesel engine is high, and the first investment is large, but it has low fuel cost and the engine is not prone to failure.

3. Compared with diesel, gasoline has a low boiling point and is easy to gasify, while diesel has a low spontaneous ignition temperature.

The gasoline engine draws in a mixture of air and gasoline from the intake valve.

Diesel engines are air.

When the diesel engine intakes the air stroke, the collapse and excavation into the cylinder is a mixture of fuel and air. （）

a.That's right. b.Mistake.

Correct answer: B