1. Increase engine lift power. In the case of constant engine displacement, the engine can be injected with more fuel, thereby increasing the power of the engine. The power and torque of the engine after the supercharger is increased by 20% to 30%. Conversely, under the same power output requirements, the cylinder bore of the engine can be reduced, and the size and weight of the engine can be reduced.
2. Improve engine emissions. The turbocharger engine reduces the displacement of harmful components such as particulate matter and nitrogen oxides in the engine exhaust by improving the combustion efficiency of the engine. It is an indispensable configuration for diesel engines to meet Euro II emission standards.
3. The earliest turbocharger patent application in 1905, Dr. Alfred Buchi of Sulzer Brothers Research and Development applied for the patent for the first turbocharger - the power-driven axial supercharger, but given the industry at the time At the level, Dr. Buchi did not manufacture the first efficient turbocharger product. In 1911, the Winterthur supercharger plant in Switzerland was started. In 1915, the prototype aircraft engine supercharger was built, driven by engine exhaust, and the main purpose was to overcome the negative impact of high-altitude thin air on power. During World War II, a supercharger made by General Electric (GE) raised the aircraft to an altitude of 10,000 meters.
After forced pressurization, the temperature and pressure of the gasoline engine during compression and combustion will increase, and the tendency to deflagration will increase. In addition, the exhaust temperature of the gasoline engine is higher than that of the diesel engine, and it is not appropriate to increase the valve overlap angle (the time when the intake and exhaust valves are simultaneously opened) to enhance the cooling of the exhaust gas, and the reduction of the compression ratio may cause insufficient combustion.
4. Also, the speed of the gasoline engine is higher than that of the diesel engine, and the air flow varies greatly, which easily causes the turbocharger reaction to lag. In response to a series of problems with the use of turbochargers in gasoline engines, engineers have made targeted improvements to make the gasoline engine also use the exhaust turbocharger.
After the engine has been running at high speed for a long time, it cannot be turned off immediately. When the engine is running, some of the oil is supplied to the turbocharger rotor bearing for lubrication and for cooling. After the running engine suddenly stops, the oil pressure drops rapidly to zero, the high temperature of the turbocharger turbine part is transferred to the middle, and the heat in the bearing support shell cannot be quickly taken away, while the supercharger rotor is still rotating at high speed under inertia.
Therefore, if the machine suddenly stops during the engine heat state, it will cause the oil remaining in the turbocharger to overheat and damage the bearing and the shaft. In particular, it is necessary to prevent the sudden flameout after a few feet of the throttle.