Hybrid Electric Vehicles Benefits, Function and limitations

1. Benefits of electric machine in HEV as compared to ICE

Constant high torque at low speeds 
Very high efficiency
Instant torque delivery
Energy recovery capability

2. Functions of hybrid Electric vehicle

Engine idle stop/start
Electric torque assistance(fill and boost)
Energy recuperation (regenerative breaking)
Electric driving
Battery charging (during driving)
Battery charging (from the grid)

3. The main limitations of a HEV are:-

It adds more weight to the vehicle due to additional electric components,
It is more difficult to build the HEV
The total cost of purchasing and ownership increase (compared to a ICE vehicle). In most of the HEVs the electric propulsion is done using premanent-magnet electric machine. 

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