Simulation and Experiment of Two-stage Turbocharged System for Vehicle Heavy-duty Diesel Engine

The matching of two-stage turbocharged system for a vehicle heavy-duty diesel engine was studied.Based on the requirements of product development,the high and low pressure stage turbocharger was selected.Using GT-Power software,the simulation model of two-stage turbocharged diesel engine was established,the full load conditions were simulated and calculated,and the influences of two-stage turbocharged energy distribution on diesel engine performance were analyzed.Finally,the test platform of two-stage turbocharged diesel engine was built and the experiments of external characteristic,universal characteristic and emission characteristic were carried out.The simulated and experimental results show that the two-stage turbocharged system can significantly increase the torque at low speed,improve the fuel economy,extend the operating area of fuel economy and greatly reduce the PM emission of diesel engine.