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Diesel engines are internal combustion engines designed to use diesel fuel as a primary source of energy. They operate by compressing air until it reaches a high temperature, at which point diesel fuel is injected and ignites spontaneously. This two-stroke process results in higher thermal efficiency compared to gasoline engines, making diesel engines popular for heavy-duty applications such as trucks, buses, and construction equipment. Diesel engines are typically larger and heavier than gasoline engines due to their robust design and construction. They have a compression ratio of around 14:1 to 25:1, which is significantly higher than that of gasoline engines. The high compression ratio allows diesel engines to generate more power and torque, making them ideal for applications requiring sustained high loads. Diesel engines are also known for their durability and longevity. They have fewer moving parts than gasoline engines, which reduces the likelihood of mechanical failure. Additionally, diesel engines can operate at higher temperatures without damage, allowing for longer service intervals and lower maintenance costs. The fuel system in a diesel engine is more complex than that of a gasoline engine. Diesel fuel must be injected at high pressure into the cylinder to ensure complete combustion. Modern diesel engines use electronic fuel injection systems, which provide precise control over fuel delivery, improving performance and reducing emissions. Diesel engines emit fewer greenhouse gases than gasoline engines but produce more particulate matter and nitrogen oxides (NOx). To address these emissions issues, manufacturers have developed advanced exhaust treatment systems, such as diesel particulate filters (DPFs) and selective catalytic reduction (SCR) systems, which significantly reduce emissions. In summary, diesel engines are internal combustion engines designed for heavy-duty applications that require high power and torque output. They operate by compressing air until it reaches a high temperature, at which point diesel fuel is injected and ignites spontaneously. Diesel engines are known for their durability, longevity, and thermal efficiency but emit more particulate matter and NOx than gasoline engines. Advanced exhaust treatment systems have been developed to address these emissions issues.