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The Advantages And Disadvantages Of Diesel Engine

     Traditional diesel engine Features: thermal efficiency and economic performance, diesel engine using compressed air to improve the air temperature, so that the air temperature exceeds the ignition point of diesel fuel, then sprayed into the diesel, diesel spray and air mixture of their own ignition and combustion. Therefore, the diesel engine does not need ignition system. At the same time, the fuel supply system of diesel engine is relatively simple, so the reliability of diesel engine is better than that of gasoline engine. The compression ratio of diesel engine is very high because it is not restricted by deflagration and the need of diesel spontaneous combustion. Thermal efficiency and economic performance are better than the gasoline engine, at the same time in the case of power, diesel engine torque, the maximum power when the speed is low, suitable for the use of truck.Diesel Engine
    But the diesel engine is working under great pressure, it is required that the relative parts have high structural strength and stiffness, so the diesel engine is bulky and the fuel injection pump and nozzle manufacture precision is high, so the cost is higher; In addition, the diesel engine works rough, the vibration noise is big, the diesel oil is not easy to evaporate, the winter cold car start difficult. As a result of the above characteristics, the former diesel engines are generally used in large and medium trucks. Traditionally, diesel engine due to the relatively bulky, power index is not as good as the gasoline engine (low speed), noise, high vibration, soot and particles (PM) emissions are more serious, so has been rarely favored by cars. In particular, the new development of small-scale high-speed diesel engines, a group of advanced technology, such as electronically controlled direct injection, common rail, the application of Turbo and intercooler technology in small diesel engine makes the shortcoming of the original diesel engine be solved better, and the advantages of diesel engine in energy saving and CO2 emission are not replaceable by all the thermodynamic engines including gasoline engines, and become "Green engine".Diesel Engine
    The diesel engine is inhaling pure air during the intake stroke. At the end of the compression stroke, diesel fuel oil injection pump will increase the oil pressure to more than 10MPa, through the injector injected into the cylinder, in a very short time with the compressed high temperature air mixture, forming a combustible mixture gas. Because the compression ratio of diesel engine is high (generally 16-22), the air pressure at the end of compression can reach 3.5-4.5MPa, at the same time the temperature is up to 750-1000k (while the gasoline engine at this time of the mixed gas pressure will be 0. $number. 2MPa, temperature up to 600-700k), greatly exceeding the As a result, diesel fuel burns spontaneously after it has been injected into the cylinder and mixed with air in a very short period of time. The air pressure in the cylinder rises rapidly to the 6-9mpa, and the temperature rises to the 2000-2500k. Driven by high-pressure gas, the piston moves downward and drives the crankshaft to rotate, and the exhaust gas is discharged into the atmosphere by the exhaust pipe.Diesel Engine