The influence of the turbocharger on the engine was the most obvious is the pressure 

form can make the engine main parts of the mechanical load and thermal load increases, 

the need to use a stronger and more resistant to high temperature of the metal reinforcement 

for engine, adjust the oil supply system, change the distribution phase, reasonable increase 

valve overlap Angle, increasing excess air coefficient, adjust the exhaust system, cooling of 

pressurized air.

But the turbocharger is also hard, low speed exhaust gas energy is too low, insufficient 

pressurization pressure, resulting in poor intake. The internal reason lies in the small 

flow of compressor surge phenomenon, leading to unstable work. At high speed, the 

exhaust gas energy is too high, resulting in too high air intake, resulting in too thin mixture. 

At high speeds, in order to avoid excessive pressurized air, all turbochargers have pressure 

regulators, the purpose of which is to direct excess exhaust gas to the exhaust pipe under 

optimal conditions.

For low speed working conditions, it is necessary to mention two turbocharging schemes, 

constant pressure turbocharging system and pulse turbocharging system, first briefly talk 

about the differences between the two systems, constant pressure turbocharging system 

is the exhaust gas of each cylinder into a main pipe, and then into the exhaust vortex tube. 

Pulse pressurization system is the exhaust gas of different cylinders into the vortex tube.