Improvement pathways of vehicle fuel energy conversion based on energy flow experiment and system simulation

In this study, the energy flow of an internal combustion engine (ICE) vehicle is experimentally investigated in a climate chamber under Worldwide Light-duty Test Cycle (WLTC). Each part of the tested vehicle energy loss has been compared to the similar displacement of engine or type of transmission according to the database of conventional gasoline engine passenger car. Then, an integrated simulation model for the tested vehicle is established and calibrated. After that, some technological pathways have been taken for tested vehicle fuel saving by using the calibrated simulation model. The specific fuel saving technological pathways mainly include excess air coefficient improving, engine speed decreasing when the engine resumed fuel supply, engine coolant temperature improving, engine coolant temperature rise process improving, transmission oil temperature and rise process improving, engine idle speed decreasing and transmission gear in neutral position when the vehicle speed is 0, electrical accessories power reducing, and engine cold start speed decreasing. The fuel saving degree of above technological scheme is 0.57%, 1.37%, 0.25%, 0.38%, 0.53%, 2.34%, 0.61%, and 0.59%, respectively. At last, the effects of combinatorial technological scheme to vehicle is simulated and experimented, and the fuel saving degree of them is 5.63% and 5.92%, respectively.

Abstract licence: CC BY-NC

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