First of all, to talk about the general principle of the turbocharger, exhaust turbocharger mainly by the pump and turbine components, of course, there are other control components. The pump impeller and the turbine impeller are connected by a shaft, that is, the rotor. The exhaust gas discharged from the engine drives the pump impeller, the impeller drives the turbine impeller to rotate, and the turbo rotates to pressurize the intake gas system. Turbocharger installed in the exhaust side of the engine, so the turbocharger operating temperature is high, and supercharger rotor speed is very high at work, up to tens of thousands of revolutions per minute, so high speed and temperature Making the common mechanical needle or ball bearings can not work for the rotor, so the turbocharger commonly used full-floating bearings, lubricated by the oil, as well as coolant for turbocharger cooling. In the past, turbochargers were mostly used in diesel engines, because the combustion of gasoline and diesel is not the same, so the form of the engine turbocharger is also different.
Gasoline engine is different from the diesel engine, it is not into the cylinder air, but the mixture of gasoline and air, the pressure is too large and easy to deflagration. Therefore, turbochargers must be installed to avoid deflagration. There are two related issues here, one for high temperature control and the other for ignition timing control.