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What are the ignition methods for automobiles?

1 Answers

JuliaRose

07/30/25 12:20am

Based on the ignition methods of automobile engines, they can be divided into compression ignition and spark ignition. Below are the relevant introductions to compression ignition and spark ignition: 1. Compression ignition: This corresponds to the ignition method of diesel engines. Diesel engines use diesel as fuel. Compared to gasoline, diesel has a lower auto-ignition temperature (around 220°C), higher viscosity, and is less prone to evaporation. Additionally, diesel engines do not have spark plugs, and their compression ratio is higher than that of gasoline engines. Therefore, diesel engines rely on the compression stroke to compress the air-fuel mixture to the ignition point, causing it to auto-ignite. Hence, this ignition method is called compression ignition. 2. Spark ignition: This corresponds to the ignition method of gasoline engines. The auto-ignition temperature of gasoline (around 480°C) is higher than that of diesel, and its viscosity is lower, making it easier to evaporate. As a result, gasoline can form a uniform mixture with air outside the cylinder or be directly injected into the cylinder using a fuel injection system. Then, near the end of the compression stroke, the mixture is ignited by the spark from the spark plug. Hence, this ignition method is called spark ignition.

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