Difference Between Gasoline Engine and Diesel Engine (1)

The gasoline engine generally injects gasoline into the intake pipe and mixes it with the air to form a combustible mixture and then enters the cylinder. People usually call it an ignition engine. The diesel engine generally injects diesel directly into the engine cylinder through the fuel injection pump and nozzle, and evenly mixes with the compressed air in the cylinder, spontaneously ignites under high temperature and high pressure, and pushes the piston to do work. This type of engine is usually referred to as a compression ignition engine.

Gasoline engine vehicles have the characteristics of high speed (the speed of gasoline engine for cars can be as high as 5000-6000 rpm, and the gasoline engine for trucks can reach about 4000 rpm), light weight, low noise during operation, easy starting, and low manufacturing and maintenance costs. It is widely used in cars, medium and small trucks and military off-road vehicles. The disadvantage is that the fuel consumption is higher, and thus the fuel economy is poor.

Due to the high compression ratio of diesel engine vehicles, the average fuel consumption is about 30% lower than that of gasoline engine vehicles, so the fuel economy is better. A 1.7-liter diesel car can save 2 liters of fuel per 100 kilometers compared to a 1.6-liter gasoline car. Most trucks use diesel engines. The weakness of diesel engines is that the speed is lower than that of gasoline engines (generally the maximum speed is about 2500-3000 rpm), the quality is large, and the manufacturing and maintenance costs are high (because the fuel injection pump and fuel injector have high processing accuracy requirements). Its application range is expanding to medium and light trucks. Foreign diesel cars have also developed rapidly, and their maximum speed can reach 5000 rpm.

To understand the difference between a gasoline engine and a diesel engine, we must first understand the difference between gasoline and diesel. The refining process of petroleum mainly adopts the method of fractional distillation, which is to heat crude oil first to obtain different substance vapors, and then to The steam is cooled and different products are extracted. Such as gasoline, diesel, kerosene, lubricating oil, asphalt and so on.

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