Why don't diesel engines use spark plugs for ignition?

[SanAmir]

This is because diesel has a relatively low ignition temperature. Here are the relevant explanations: 1. Introduction: With the motor driving the crankshaft to operate, it drives the engine's crank connecting rod mechanism, valve mechanism, fuel supply mechanism, etc. After intake and compression, the temperature of the compressed air at the end of compression reaches above 700 degrees. At this time, high-pressure diesel is injected into the cylinder in a mist form from the fuel injector, and the formed mixture is immediately ignited, pushing the crankshaft to continue operating. 2. Compression ignition: Diesel engines directly compress the mixture of air and fuel to the ignition point, causing spontaneous ignition, which is called compression ignition. There is no need for an external spark to ignite, so spark plugs are not used. Gasoline engines have a lower compression ratio compared to diesel engines and require ignition to make the gas in the cylinder combust.