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Heavy, noisy, black smoke, many people have poor visual impression on the diesel engine, coupled with the more complex structure of the diesel engine, many people lack understanding of the diesel engine, especially the lack of understanding of modern advanced diesel engine. In fact, after many years of research and application of new technologies, the status quo of modern diesel engines has not been consistent with the past. Modern advanced automotive diesel engines generally adopt technologies such as electronically controlled injection, common rail, and turbo-charged intercooling. They have achieved major breakthroughs in terms of weight, noise, and smoke, and have reached the level of gasoline engines. At present, foreign diesel engines for light vehicles are becoming more and more common. Mercedes-Benz, Volkswagen, BMW, Renault, Volvo and other European brands have adopted diesel engines. The main difference between diesel engines and gasoline engines in electronically controlled injection is that the electronically controlled injection system of gasoline engines only controls the air-fuel ratio (the ratio of gasoline to air). The electronically controlled injection system of diesel engines regulates the output size by controlling the injection time. Diesel fuel injection control is determined by the engine speed and accelerator pedal position (throttle lever position). Therefore, the basic working principle is that the computer first calculates the basic fuel injection quantity based on the input signals of the speed sensor and the throttle position sensor, and then corrects the signal according to the sensors such as the water temperature, the intake air temperature, the intake pressure, and then from the control sleeve position. The sensor signal is feedback-corrected to determine the optimum fuel injection. The electronically controlled diesel injection system consists of sensors, ECUs (computers) and actuators. Its task is to electronically control the fuel injection system, realizing the real-time control of the fuel injection quantity and timing of the fuel injection with operating conditions. Sensors such as rotation speed, temperature and pressure are used to simultaneously input real-time detection parameters into the computer and compare them with the stored parameter values. After processing and calculation, the fuel injection pump, exhaust gas recirculation valve and glow plug actuators are executed according to the optimal values. Control, drive the fuel injection system, so that the best operating state of the diesel engine. What is common rail technology and why common rail technology is used? In automotive diesel engines, high-speed operation makes the diesel injection process time only a few thousandths of a second. Experiments have shown that the pressure in the high pressure tubing throughout the injection process is time-dependent. It varies from location to location. Due to the compressibility of diesel fuel and the pressure fluctuation of diesel oil in the high-pressure tubing, the actual injection state is different from the plunger supply regulation provided by the injection pump. Pressure fluctuations in the tubing can sometimes cause the pressure in the high pressure tubing to rise again after the main injection, reaching the pressure at which the needle valve of the injector opens, and reopening the closed needle valve to produce a secondary injection phenomenon. Since the secondary fuel injection cannot be completely burned, smoke and hydrocarbon (HC) emissions are increased, and fuel consumption is increased. In addition, the residual pressure in the high pressure fuel line changes after each injection cycle, resulting in unstable injection, especially in the low rotation speed range. In severe cases, not only the injection is uneven, but also intermittent non-ejection occurs. phenomenon. In order to solve the defect of diesel fuel pressure change, modern diesel engines use a technology called "common rail". Common-rail technology refers to a type of oil supply system in which a high-pressure oil pump, a pressure sensor, and an ECU comprise a closed-loop system consisting of a spray pressure and a spray process that are completely separated from each other. The high-pressure fuel pump conveys the high-pressure fuel to the public oil supply pipe. The accurate control of the oil pressure in the public oil supply pipe makes the pressure of the high pressure oil pipe irrelevant to the engine speed, which can greatly reduce the variation of the fuel supply pressure of the diesel engine with the engine speed, thus reducing the defects of the conventional diesel engine. The ECU controls the injection quantity of the injector. The injection quantity depends on the pressure of the fuel rail (public supply pipe) and the length of the solenoid valve opening time. As for turbocharged intercooling technology, when the turbocharger compresses fresh air through the mid-stage cooler, it then flows through the intake manifold and intake valve to the cylinder combustion chamber. Effective intercooling technology allows boost temperature to drop below 50°C, helping to reduce exhaust emissions and improve fuel economy.