A Simulation Study Of The Influence Of Valve Valve Phase On The Power Performance Of A Supercharged Gasoline Engine

The exhaust gas turbocharging technology can greatly improve the output power and torque,while reducing the effective fuel consumption,reduce exhaust noise,in the light vehicle has a very high value for promotion and application.This technology recovers the energy of the exhaust gas,precompresses the air before it enters the cylinder,and increases the volume of intake air per unit volume.However,after the inlet pressure is increased,the optimal gas phase changes and the VVT system needs to be re-optimized.Based on a thorough understanding of research trends and development directions in this area,this paper uses avl-boost software to simulate the working process of a turbocharged GDI engine for a light vehicle.First of all,adjust the model parameters,the use of measured engine characteristics of the accuracy of the model calibration,verification.Then,by changing the inlet phase in the external characteristics,the influence of the gas phase on the engine dynamic performance was studied,and the optimum gas-phase distribution.At the same time,it is concluded that the appropriate increase of intake advance angle and valve overlap angle will accelerate the acceleration at low engine speed,increase the reserve torque of engine,and increase the work steadily.After that,the phase of the valve was simulated and optimized at the calibrated speed and the maximum torque speed,and the laws of dynamic change with the gas phase at low speed and high speed were given.Papers work for VVT design and matching provide an important reference.