In HEV one powertrain favours steady state operation, such as an ICE or fuel cell. The other powertrain in the HEV is used to supply the dynamic power. The total energy output from the dynamic powertrain will be zero in the whole driving cycle. Generally, electric motors are used to meet the dynamic power demand. This hybrid drivetrain concept can be implemented by different configurations as follows:
- • Series configuration
• Parallel configuration
• Series-parallel configuration
• Complex configuration
In Figure 4 the functional block diagrams of the various HEV configurations is shown. From Figure 4 it can be observed that the key feature of:
- • series hybrid is to couple the ICE with the generator to produce electricity for pure electric propulsion.
• parallel hybrid is to couple both the ICE and electric motor with the transmission via the same drive shaft to propel the vehicle
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