Week 2 Session 7

Compare the different architectures of HEV. Discuss the pro's and con's

Answer:

Hybrid vehicle types based on architectures as follows

• series HEV
• parallel HEV
• series-parallel HEV

Comparison of Series HEV, Parallel HEV, and Series-Parallel HEV.

Series HEV:

• Internal combustion engine directly does not power wheels
• Engine drives the generator and the generator either charge the batteries or power an electric motor that drives the wheels
• Recharged from the IC engine, and Regenerative braking

Parallel HEV:

• Both IC engine and electric motor are connected to the transmission
• IC engine and motor supply power to wheels switching back and forth as per driving conditions.
• Recharge from the regenerative braking.
• Honda CIVIC is an example of a Parallel HEV

Series – Parallel HEV:

• IC Engine can drive the wheels directly as in parallel
• Effectively be disconnected with an only electric motor providing power to wheels as in series.
• At lower speed, operates more as a series HEV.
• At higher speeds where the series drivetrain is less efficient IC engine is taken over.
• Toyota Prius is an example of a Series–Parallel HEV.

Each type of HEV has its own pros and cons.

Hybrid Electric Cars Pros and cons are listed below.

Pros:

• Hybrid cars may be more environmentally – friendly
• They may require less maintenance
• They may have a higher resale value.
• Range anxiety may not be a problem

Cons:

• High voltage system Repair costs may be more expensive.
• They may have a higher upfront cost.
• They may have less power when compared to standard ice vehicles.