Abstract:

Some tests for 48-V vehicles with gear shift indicator (GSI) were carried out, and China national correlation standards were analyzed to investigate the energy-saving of the GSI. After analyzing the acceleration performance of the 48-V system, compared the differences of the actual gear selection, transients
speed and torque of engines between the 48-V vehicles with or without GSI, under the New European Driving Cycle (NEDC), 4 vehicles were tested under both the normal gear shift and the GSI strategies, according to the national standards, with combining the national standard analysis and tests. The results show that the fuel consumption per 100 km for 48-V vehicle with the GSI is reduced by 0.38 L (which is equivalent to the 5.80% of fuel economy) under the same test conditions and NEDC test cycle. And the fuel consumption reduction from GSI for the 48-V vehicle is greater than that of the conventional one. Therefore, adjusting the engine speed and torque can reduce the fuel consumption. As an emerging energy-saving technology, GSI should be reflected in relevant national standards.

Key words: hybrid electric vehicles (HEV) , gear shift indicators (GSI) , energy-saving , national standards , 48-V vehicles