What are the characteristics of diesel engines compared to gasoline engines?

[SebastianAnn]

Compared to gasoline engines, diesel engines have characteristics such as higher compression ratio, better thermal efficiency, and superior fuel economy. The differences between gasoline and diesel engines are as follows: 1. Firstly, the injection method is different: conventional gasoline engines mix gasoline with air before entering the cylinder, while diesel engines directly inject diesel into the cylinder already filled with compressed air. 2. Ignition method differs: gasoline engines require spark plugs to ignite the air-fuel mixture, whereas diesel engines rely on compression auto-ignition. 3. Compression ratio varies: diesel engines generally have a higher compression ratio than gasoline engines, resulting in greater expansion ratio and thermal efficiency, leading to lower fuel consumption compared to gasoline engines. 4. Intake stroke: diesel engines draw in pure air, while gasoline engines intake a mixture of air and gasoline.