Abstract:

A standardized test-evaluation method was proposed for the hybrid electric vehicles with or without “plug-in” to investigate the predictive energy saving technologies for the national standards pre-research for automobile energy saving. By integrating map traffic information into road foresight technology, a set of critical data fields required for predictive energy saving was identified as well as the necessity of standardization was emphasized. The energy-saving mechanism was improved through dynamic optimization: the state of charge (SOC) reference trajectory was computed using global dynamic programming, and tracking control was achieved via PI control. Simulation analyzed influence of initial SOC (20%~30%) and test conditions on the energy-saving performance. Based on these findings, a dynamometer test method was developed to standardize evaluation processes. An evaluation was conducted on the energy-saving effects of dynamometer tests for a specific vehicle. The results indicate that the dynamometer test on the vehicle achieved a 3.97% energy saving, with the SOC variation trend aligning with theoretical expectations. This demonstrates the feasibility of evaluating energy-saving performance through dynamometer testing methods.

Key words: hybrid electric vehicles, predictive energy saving technology, energy management, dynamometer test, evaluation method