Does the supercharger accessories have a smaller displacement and lower fuel consumption?
Does the supercharger accessories have a smaller displacement and lower fuel consumption?
The turbo boosts the intake system. The supercharger is installed on the exhaust side of the engine, so the working temperature of the supercharger accessories is very high, and the speed of the rotor of the supercharger is very high when it is working, which can reach hundreds of thousands of revolutions per minute. The high speed and temperature make common mechanical needle or ball bearings unable to work for the rotor, so Holset superchargers generally use fully floating bearings, lubricated by oil, and coolant to cool the supercharger. The temperature and pressure of gasoline engine compression and combustion will increase, and the tendency of knocking will increase.
In addition, the exhaust temperature of gasoline engines is higher than that of diesel engines, and it is not appropriate to increase the valve overlap angle (the time when the intake and exhaust valves are opened at the same time) to strengthen the cooling of the exhaust gas, and reducing the compression ratio will cause insufficient combustion. In addition, the speed of the gasoline engine is higher than that of the diesel engine, and the air flow changes greatly, which is easy to cause the reaction lag of the Holset supercharger. In response to a series of problems arising from the use of Holset turbochargers in gasoline engines, engineers have made targeted improvements one by one, so that gasoline engines can also use exhaust gas Holset turbochargers.
After forced supercharging, the temperature and pressure of supercharger accessories and combustion will increase, and the tendency of detonation will increase. In addition, the exhaust temperature of gasoline engines is higher than that of diesel engines, and it is not appropriate to increase the valve overlap angle (the time when the intake and exhaust valves are opened at the same time) to strengthen the cooling of the exhaust gas, and reducing the compression ratio will cause insufficient combustion. In addition, the speed of the gasoline engine is higher than that of the diesel engine, and the air flow changes greatly, which is easy to cause the response lag of the turbocharger. In response to a series of problems arising from the use of turbochargers in gasoline engines, engineers have made targeted improvements one by one, so that gasoline engines can also use exhaust gas turbochargers.
When the turbocharger accessories work with the diesel engine, the allowable working range of the turbine is relatively wide, the high efficiency range is also relatively wide, and there are relatively few problems in the cooperative operation. Therefore, the exhaust gas turbocharger technology is compared in the application of diesel engines. many. For the gasoline engine, after the supercharging, the temperature and pressure of the compressed air mixture and the combustion gas in the cylinder are increased, and the thermal load of the heated parts of the combustion chamber is increased, which is prone to knocking. This is one of the main reasons why supercharging technology has not been widely used in gasoline engines so far. Turbocharging is one of the important technologies for future automobile development. Compared with the naturally aspirated engine with the same power, it has a smaller displacement and lower fuel consumption, which is also of positive significance for energy saving and emission reduction.
