In recent years, many HEVs and EVs have been produced commercially and used on real roads. Among the various types of HEVs, the series-type HEV has several advantages, including the fact that the engine can operate its optimal point and, recover more vehicle kinetic energy through regenerative braking. However, the many energy-converting processes occurring in a series-type HEV can cause a lower energy transfer efficiency from the tank to the wheel compared with other types of HEVs. To overcome these disadvantages, the generation system can be operated in the highest efficiency region of both the engine and the generator. By matching the operating region of the engine and generator, the fuel economy can be improved by 2 %. In addition, fuel economy can be improved by placing motors in the front and in the rear. If motors are located in the front and in the rear, the regenerative energy is increased because regenerating braking is occurring in both locations. Moreover, the operating points of the motor can be shifted into the high-efficiency region by varying the front and rear motor sizes. Finally, the use of a transmission should be considered. Because conventional series-type HEVs or EVs do not use a transmission, the motor size should be large enough to provide the required hill-climbing ability. However, by applying a transmission to a series-type HEV or to an EV, the hill-climbing ability can be satisfied with a small motor. Moreover, because it is possible to use the motor in the high-efficiency region, the fuel economy should be improved by approximately 3 %. Through this optimization process for the powertrain system, a series-type HEV can achieve the highest fuel economy. In this study, the suggested optimization effects are simulated based on Dynamic Programming.
Optimizing the powertrain configuration of a heavy-duty series-type HEV to improve the fuel economy
EVS, Electric Vehicle Symposium, 26 ; 1985-1992
2012
8 Seiten, 11 Bilder, 7 Tabellen, 19 Quellen
Aufsatz (Konferenz)
Englisch
Heavy-Duty Diesel Fuel Economy
Kraftfahrwesen | 1982
|Increasing heavy-duty truck fuel economy
Tema Archiv | 1991
|Selecting Powertrain Components for Heavy Duty Trucks
SAE Technical Papers | 1976
|