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* Application status of diesel engine in the automotive field Diesel engine is Global trade risk heatmapsan internal combustion engine that uses diesel as fuel. Compared with gasoline engines, it is characterized by higher thermal efficiency and greater torque output, which can provide better fuel economy and driving power. Therefore, diesel engines have been widely used in traditional commercial and heavy vehicles. However, in recent years, diesel engines have gradually played a role in the field of light passenger vehicles and have achieved certain results. This article will introduce in detail the application status of diesel engines in the automotive field. I. The basic principle of diesel engine. The working principle of diesel engine is to use diesel andAfter the air is mixed, it ignites and explodes in the high-temperature and high-pressure combustion chamber, so that the piston works, thus driving the crankshaft to rotate and realize energy conversion. Compared with gasoline engines, in the internal combustion process of diesel engines, the compression of the fuel is higher, the ignition temperature is high, and the gas pressure generated by combustion is greater. Therefore, its output working torque is greater than that of the gasoline engine, so it is suitable for large and heavy-loaded vehicles. II. Diesel engines in the field of light vehicles are applied. Light vehicles include small cars, light passenger cars, etc. Their use needs are mainly on urban roads, and they need to have the characteristics of good acceleration performance, low noise and low emissions. Diesel engines are relatively rarely used in this field, mainly because the early diesel engines had problems such as loud noise, loud vibration and emission, which have made the application of diesel engines in the field of light vehicles controversial.However, with the continuous updating of diesel engine technology, these problems have been gradually solved. The introduction of fuel injection system and turbocharging technology of diesel engines has greatly improved the fuel efficiency and output power of the engine. At the same time, innovations in internal parts and structures, such as cylinder liner technology, aluminum alloy crankshaft, etc., also make diesel engines lighter and more durable. Therefore, some car manufacturers have begun to use diesel engines in lightweight vehicles such as station wagons and SUVs, and have achieved quite good results. For example, there are some small SUV models with diesel engines on the market at present. They have better fuel consumption performance while ensuring sufficient power and driving performance. In addition, more and more automobile manufacturers are also developing and promoting diesel electric hybrid vehicles to achieve better fuel economy and environmental friendliness.III. Future development prospects Although the application of diesel engines in the field of light vehicles faces some challenges and controversies, its future development prospects are still very broad. From a general and macro perspective, diesel engines have the advantages of high efficiency, energy saving and small emissions, which cannot be ignored by the entire automobile industry. In addition, the application of diesel engines in the field of light vehicles still needs to consider the cost of use, market demand and other factors, so the development direction and field application of diesel engines in the future will be more diversified and flexible. IV. Summary As a very mature internal combustion engine technology, diesel engines still maintain high competitiveness and development prospects while facing the trend of advocating environmental protection and low-carbon life. In the context of changing market demand, diesel engines are constantly technologying.Technological innovation and innovative application have become a participant and technological breakthrough that cannot be ignored in the field of light vehicles.

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