The difference between gasoline engine and diesel engine and how to determine?

The main difference is that the fuel injection method The gasoline engine inhales a combustible mixture that is ignited by a spark plug The diesel engine injection is diesel fuel that generates heat through gas pressure and spontaneously ignites the compression ratio of the diesel engine.

First of all, you can open the lid of the mailbox and smell it, this one doesn't even need to open the front machine lid, hehe. Sound, the sound of the diesel engine is still much louder than that of the gasoline engine, and the sound of the diesel engine is relatively low and the frequency is lower. Speed, the speed of the diesel engine is relatively low, and the difference between the maximum speed of the gasoline engine is at least 1 3.

Torque, the low-speed torque of the diesel engine is relatively large, but the high-speed torque is not as good as the gasoline engine, plus the low speed, it is not as good as the gasoline when running at high speed. The amount of oil consumed, because of the low speed, so the diesel engine is very fuel-efficient, more than 1 3 than gasoline. The working principle, the gasoline engine has a spark plug, which is used to ignite the mixture, and the diesel engine is compression-ignited, that is, the cylinder compresses the mixture, does work on the mixture (physical noun), and the mixture spontaneously combustes.

Thermally speaking, the efficiency of a diesel engine is a little higher than that of a gasoline engine. Judgment, Look at the maximum speed of the tachometer, the 4000 of diesel is almost the end, and the gasoline is more than 6000 Listen to the sound, you can't be wrong if you listen to it once The diesel engine with the same displacement is one size larger than the gasoline engine, hehe.

The difference between a gasoline engine and a diesel engine is that the gasoline engine is ignited, and the diesel engine is compressed.

The easiest way to tell the difference is to see if there are spark plugs! The gasoline engine has a spark plug! Diesel engines do not!

The differences between gasoline engine and diesel engine are as follows:

1. The gas mixing method is different. The general gasoline engine enters the cylinder after mixing with air outside the cylinder, while the diesel engine injects diesel directly into the cylinder and mixes with the air.

2. The ignition method is different。Diesel engines require spark plugs to ignite the gas mixture, while diesel engines are ignited by compression and spontaneous ignition.

3. Power and torque are different. If you compare the gasoline engine and the diesel engine with the same displacement, you will find that the power of the gasoline engine is greater, but the torque of the diesel engine is greater. This is mainly due to the large compression ratio of the diesel engine and the large piston stroke, so it can emit more torque.

The biggest advantage of diesel engine is that it can emit more torque at lower speeds, and the power is sufficient. However, due to the low speed, the power is not large, and the maximum hour of a gasoline car is generally faster than that of a diesel car.

Differences: 1. Gasoline engines generally inject gasoline into the intake pipe and mix it with air to form a combustible mixture, and then enter the cylinder, which is ignited by a spark plug and burned to expand to do work. It is often referred to as a ignition engine.

The diesel engine generally injects diesel directly into the engine cylinder through the fuel injection pump and fuel injection nozzle, and evenly mixes it with the compressed air in the cylinder, spontaneously ignites at high temperature and high pressure, and pushes the piston to do work. This type of engine is often referred to as a compression-ignition engine.

2. The characteristics of the traditional diesel engine: good thermal efficiency and economy, the diesel engine adopts the method of compressed air to increase the air temperature, so that the air temperature exceeds the spontaneous ignition point of the diesel, and then sprays diesel, diesel spray and air mixture at the same time ignition and combustion. As a result, the diesel engine does not require an ignition system.

At the same time, the fuel supply system of diesel engines is also relatively simple, so the reliability of diesel engines is better than that of gasoline engines.

3. The advantages of diesel engine are high torque and good economic performance. Each working cycle of a diesel engine also goes through four strokes: air intake, compression, work and exhaust. However, because the fuel used in diesel engine is diesel, its viscosity is greater than that of gasoline, it is not easy to evaporate, and its autoignition temperature is lower than that of gasoline, so the formation and ignition of combustible mixture are different from gasoline engines.

4. Due to the high working pressure of the diesel engine, the relevant parts are required to have high structural strength and rigidity, so the diesel engine is relatively bulky and large; The manufacturing accuracy of the fuel injection pump and nozzle of the diesel engine is high, so the cost is high; In addition, the diesel engine works roughly, and the vibration and noise are large; Diesel fuel is not easy to evaporate, and it is difficult to start when the car is cold in winter. Due to the above characteristics, diesel engines were generally used in large and medium-sized trucks in the past.

1) The intake air is different: gasoline engine.

It is a mixture of gasoline and air, and diesel engine is air.

2) The ignition is different: the gasoline engine is the ignition type, and the diesel engine is the pressure type.

3) The mixture forming device is different: the gasoline engine is a carburetor.

Diesel engine combustion chamber.

What is the difference between a gasoline engine and a diesel engine? Both of them belong to the flame-resistant engine, the difference is that the raw materials used are different, one uses gasoline and the other uses diesel.

First of all, their first difference is:

The gasoline engine has a spark plug.

Diesel engines have a fuel injector.

The second difference is:

The gasoline engine is ignited.

The diesel engine is compression-ignition.

This topic can be illustrated without diagrams, and should be distinguished from the following aspects:

1. Structural difference: the top of the cylinder of the gasoline engine is a spark plug, while the fuel injector at the top of the cylinder of the diesel engine.

2. Distinguish from the work process

1) In the suction stroke: the gasoline engine sucks into the cylinder a mixture of gasoline and air, while the diesel engine sucks only air into the cylinder;

2) In the power stroke: the gasoline engine ignites the gas by a spark plug, which is called ignition; The diesel engine relies on high-temperature and high-pressure gas to ignite the mist diesel, which is called compression ignition.

3. From the perspective of heat engine efficiency: the efficiency of gasoline engine is lower than that of diesel engine.

4. From the point of view of occupied volume: the gasoline engine is relatively small, but the diesel engine is relatively bulky. Therefore, gasoline engines are generally used in cars, etc., while diesel engines are generally used in large machinery such as tractors and ships.

The so-called compression ignition type means that at the end of the compression stroke, a high-temperature and high-pressure air is formed in the cylinder, which has reached the ignition point of the diesel, and ignites when the mist diesel sprayed by the fuel injector encounters the high-temperature and high-pressure air.

1.The difference between the two is the combustion method, torque, speed, emissions, etc. The most important thing is that the combustion mode of gasoline engine and diesel engine is completely different.

The gasoline engine is premixed flame transfer combustion, and the diesel engine is mainly diffusion combustion. Due to the different combustion methods, the efficiency and pollutant emissions of gasoline and diesel engines will be very different.

2.A more "powerful" diesel engine actually means more torque from the engine. If you compare the gasoline engine with the diesel bending engine of the same displacement, you will find that the power of the gasoline engine is greater, but the torque of the diesel engine is greater.

This is mainly due to the large compression ratio of the diesel engine, the large piston stroke, and the ability to emit large torque. But due to the lower speed, the power is not great. The compression ratio of the diesel engine is higher than that of the gasoline engine, so its fuel conversion rate is much higher than that of the gasoline engine, and the combustion efficiency can be obtained more noisy, so the thermal efficiency of the diesel engine is generally higher than that of the gasoline engine.

At present, the thermal efficiency of gasoline engines is generally between 30% and 40%, while diesel engines can reach 35% and 45%.

The spraying method is different. Generally, gasoline engines (except for direct injection engines) mix gasoline with fuel and enter the cylinder. The diesel engine injects diesel directly into a cylinder filled with compressed air.

4, 2.Different ignition modes. Diesel engines are ignited by spontaneous combustion of compressors, while gasoline engines need spark plugs to ignite the mixture.

5, 3.The compression ratio is not the same. The compression ratio of a diesel engine is generally larger than that of a gasoline engine, so its expansion ratio and thermal efficiency are higher, and the fuel consumption is lower than that of a gasoline engine.

Millions of car purchase subsidies.

The characteristics are different: The compression ratio of a diesel engine is large, while that of a gasoline engine is small.

When the vast majority of car owners buy a car, whether they have strong power is one of the important criteria. The engine is the source of the power of the car, and it is also the heart of the car, which determines the performance of the car, and the engine can be said to be the most important part of the car. Engines are divided into internal combustion engines, external combustion engines, electric motors, etc., among which gasoline engines and diesel engines belong to internal combustion engines.

Precautions for diesel engines.

Pay attention to the oil pressure: when the diesel engine is working, the lubricating oil is pressed to the friction surface of the parts by the oil pump and forms an oil film, so that the parts that rub against each other do not have direct contact, so as to reduce the friction.

The level of oil pressure indicates the technical state of the lubrication system, and the oil pressure should be paid attention to at any time during use. When the oil pressure is too low, it should be stopped immediately for inspection and maintenance. Too high oil pressure will also damage the oil film and aggravate wear, and the cause should also be identified and eliminated in time.

Diesel engines are compression-ignition.

The gasoline engine is ignited.