Abstract

The traditional study of matching gasoline machine and supercharger  substantially focuses on the external characteristic conditions, but the reasonable matching of external characteristic conditions cannot guarantee the reasonable matching of supercharger and gasoline machine in the whole operating range [1 ]. thus, to address the limitation of studying only the external characteristic conditions in the supercharger matching process, a thermodynamic model of a direct injection supercharged gasoline machine was established, grounded on which the matching between the supercharger and the gasoline machine in the whole operating range was studied by the three- line condition  system. The results show that the matching performance of the supercharger in the whole machine operating range can be significantly  bettered by using the three- line working condition  system to match the supercharger [2 ]. The three- line  system takes into account both full-  cargo and part-  cargo machine conditions, and can visually  estimate the operating  effectiveness of the supercharger over the entire machine operating range, as well as  prognosticate the liability of surging, blocking and over speeding of the supercharger over the entire machine operating range,  prostrating the limitation of studying only the external characteristic conditions and  furnishing a numerical evaluation  system for pre-selection and optimization of the supercharger [3].