Internal combustion engine efficiency’s 28 influencing factors and improving methods

When talking about internal combustion engine efficiency, First, make sure it’s a diesel engine or a gasoline engine.

Usually, the thermal efficiency of diesel engine is higher than that of gasoline engine.

The efficiency of the common diesel engine is 45%, while that of the gasoline engine is 30%.

Why is the efficiency of the diesel engine higher than that of the gasoline engine?

What are the factors that affect the efficiency of internal combustion engines?

How can we improve the efficiency of internal combustion engines?

Let’s talk about the efficiency of the internal combustion engine in detail:

Reasons for the difference in efficiency between diesel engine and gasoline engine

The compression ratio, the fuel used, and the fuel ignition method of the diesel engine and the gasoline engine are different.

Comparison of diesel engine and gasoline engine on different efficiency

1. The compression ratio of the diesel engine and the gasoline engine is different. When other factors are not considered, the higher the compression ratio, the more favorable the efficiency of the internal combustion engine.

2. The excess air ratio of the diesel engine is also larger than that of the gasoline engine. Most of the combustion is carried out in the case of excessive air.

3. In the diesel engine and the gasoline engine, the fuel is fired differently. The fuel in the diesel engine is compression-ignited, and the fuel in the gasoline engine is ignited by the spark plug.This will affect the isocraticity of the combustion.

4. When the fuel is burned, the temperature of the diesel engine cylinder is higher than that of the gasoline engine, which is more conducive to the improvement of efficiency.

Which factors have great influence on the thermal efficiency of internal combustion engines?

The factors that affect the energy transfer of internal combustion engines will affect the efficiency of internal combustion engines.

For example, friction loss, heat loss, combustion and so on.

Many researches have been carried out to improve the efficiency of internal combustion engine by improving the combustion of internal combustion engine.

Factors affecting the thermal efficiency of internal combustion engines

The following are common factors affecting the efficiency of internal combustion engines.

5. Compression ratio

6. Fuel injection advance angle of diesel engine

7. Ignition advance angle of gasoline engine

8. Intake air temperature

9. Coolant temperature

10. Mixing gas concentration

11. Friction between piston ring and cylinder liner

12. Friction between crank connecting rod and bearing bush

13. Leakage of gas in the cylinder

14. Lubricant related factors such as the quality and cleanliness of the lubricant.

15. Air pressure during operation of internal combustion engine.

Methods to improve the efficiency of internal combustion engines

In fact, factors affecting the efficiency of internal combustion engines are the entry points for improving efficiency.

Methods to improve the efficiency of internal combustion engines

The following are common ways to improve the efficiency of internal combustion engines.

16. Increase the compression ratio as much as possible

17. Optimize the fuel injection advance angle of diesel engines

18. Optimize the ignition advance angle of gasoline engines

19. Suitable intake air temperature

20. Suitable coolant temperature

21. Suitable mixture concentration

22. Reduce the friction between the piston ring and the cylinder liner

23. Reduce the friction between the crank link and the bearing bush

24. Reduce the leakage of gas in the cylinder

25. Use the right lubricant

26. Using boost technology

27. Use new combustion modes such as HCCI combustion, RCCI combustion

28. Dual fuel combustion mode

The above is the influencing factors and improvement methods of the internal combustion engine efficiency that I have summarized. If you have a better point of view, welcome to express it.