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Principles and core advantages of diesel engine technology
2025-09-18
Compression ignition and four stroke cycle
Diesel engines generate high temperatures (500-700 ℃) through compressed air, causing diesel to self ignite without the need for spark plugs. Its working cycle is divided into four stages: intake, compression, power generation, and exhaust, similar to gasoline engines, but with a different way of forming the mixture. Diesel engines have a compression ratio of up to 15-22 (gasoline engines only have 7-11), a thermal efficiency of 30% -40% (gasoline engines have 20% -30%), and significantly better fuel economy than gasoline engines.
High torque and low-speed characteristics
Diesel engines can output high torque at low speeds, making them suitable for heavy-duty cargo, construction machinery, and other scenarios. For example, the Weichai WP17H engine has an output torque of 3750 Nm, far exceeding gasoline engines of the same displacement.
Structure and reliability
Diesel engines have no ignition system, relatively simple fuel supply system, and low failure rate. However, the manufacturing accuracy and cost of fuel injection pumps and nozzles are high.
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