Turbochargers, exhaust gas turbocharger full name, is a supercharged car engine widely used way. The turbocharger consists of a turbine and a compressor (also known as compressor) constituted by the engine exhaust inertia momentum of the exhaust gas to drive a turbine inside the turbine, thereby driving the turbine coaxial with the compressor impeller, the impeller and then press send air filter incoming air duct so that after being pressurized into the cylinder. When the engine speed increases, the exhaust gas discharge speed and turbine speed also simultaneously increases, the impeller will compress more air into the cylinder, so that more fuel into the cylinder for combustion, and therefore increases the engine power output. Turbocharger engine without mechanical contact.

This supercharged way to effectively use the energy of the exhaust gas turbocharger, the fuel economy is better than a non-supercharged and supercharged engine, and can greatly reduce the emission of harmful gases and noise level. After an engine 4 cylinder 2.0 turbocharger fitted with a turbocharger, the maximum power output is not installed when compared with the turbocharger, increase about 40% or more. However, after the introduction of the engine exhaust gas turbocharger technology, the maximum explosion pressure and average temperatures generated will greatly increase, so that the engine's mechanical performance, lubrication performance will be affected.

To ensure the supercharged engine at high mechanical load and thermal load conditions can be reliably work durable, must make the necessary changes in the selection, design, materials and process selection The main thermodynamic parameters of the engine, rather than simply in upload a turbocharger engine on it. Since this process of change in the real Yan quite difficult, but also consider the matching between the turbocharger and the engine, and so to some extent also limits the application of the exhaust gas turbocharger on the engine. Further, since the turbine is a fluid mechanical means while the engine Toyota 2.0 turbocharger is powered mechanical device, therefore turbocharged engine torque at low speed is increased much, and when the engine operating conditions change, poor transient response, resulting in car acceleration , in particular the low-speed acceleration is poor.

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