What is the working principle of diesel engine?

Release time:

2022-10-21 16:30

The diesel engine generates high heat from compressed air, and expands explosively after being injected into atomized diesel oil. The pressure directly acts on the piston, pushing the piston to make a high-speed linear reciprocating motion along the cylinder. The crank connecting rod mechanism composed of piston pin, connecting rod and crankshaft changes the linear motion of the piston into the rotary motion of the crank, thus outputting mechanical work.

1. The working process of a diesel engine has many similarities with that of a gasoline engine. Each working cycle also experiences four strokes: intake, compression, work and exhaust. However, because the fuel used in diesel engines is diesel, its viscosity is higher than that of gasoline, and it is not easy to evaporate, while its autoignition temperature is lower than that of gasoline, the formation and ignition mode of combustible mixture are different from that of gasoline engines. The main difference is that the mixture in the cylinder of a diesel engine is compression ignition rather than ignition.

2. Compared with gasoline engines, diesel engines have the characteristics of good fuel economy, low nitrogen oxides in exhaust gas, high torque at low speed, etc. They are highly praised by European cars because of their excellent environmental protection characteristics. However, for the shortcomings of ride comfort, noise, etc., in the European advanced automobile industry, it is no longer a problem. At present, the performance and working conditions of diesel engines are almost the same as those of gasoline engines.

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