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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