Study on Turbocharger Performance Matching for Two-Cylinder High Pressure Common Rail Diesel Engine

For a 2-cylinder,4-valve per cylinder,turbocharged high pressure common rail diesel engine,the influence of different firing orders on turbocharger matching was studied,and the 360°CA firing order was selected.Considered turbocharger efficiency and engine pumping loss and the passenger car special requirement to meet both high and low speed performance,two turbocharger schemes were designed.On the basis of matching test results,optimization measures for the turbocharger were proposed.Final results show that the engine performance at low and middle speeds is improved,low speed torque increases by 8N.m,and specific fuel consumption reduces by 12g /(kW.h).Engine performance reaches the design targets and exhaust emissions meet EuroⅣemission standards.