Design Principle of Series (Electrical Coupling) Hybrid Electric Drive Train
The concept of a series hybrid electric drive train was developed from the EV drive train. 1 As mentioned in Chapter 4, EVs, compared with conventional gasoline- or diesel-fueled vehicles, have the advantages of zero mobile pollutant emissions, multienergy sources, and high efficiency. However, EVs using present technologies have some disadvantages: a limited drive range due to the shortage of energy storage in the on-board batteries, limited payload and volume capacity due to heavy and bulky batteries, and long battery charging time. The initial objective of developing a series HEV was aimed at extending the drive range by adding an engine/alternator system to charge the batteries on-board.