Hybrid Transmission Architecture and Operation Basics
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Hybrid Transmission Architecture and Operation Basics

Hybrid Transmission Architecture and Operation Basics

A 1-Day Class

As fully-electric (EVs) and hybrid-electric (HEVs) vehicles become more mainstream, the need to understand their basic architecture and operation are important than ever.  Basically, a hybrid car is one that uses two or more engines, i.e. an electric motor and a conventional engine (either petrol or diesel). The electric engine powers the car at lower speeds while the gas engine powers it at higher speeds.  Hybrid cars not only conserve fuel but also produce less CO2 emissions.  

A hybrid vehicle has multiple forms of motive power.  Hybrids come in many configurations.  For example, a hybrid may receive its energy by burning petroleum, but switch between an electric motor and a combustion engine. 

Among the different types of hybrid vehicles, only the Electric Motor (EM) and Internal Combustion Engine (ICE) type have been commercially available and well established One architecture operated in parallel to simultaneously provide power from both sources Another operated in series with one source exclusively providing the power and the second providing electricity.  Either source may provide the primary motive force, with the other augmenting the primary. 

Other combinations offer efficiency gains from superior energy management and regeneration that are offset by expense, complexity and the battery limitations. Combustion-electric (CE) hybrids have battery packs with far larger capacity than a combustion-only vehicle.  A combustion-electric hybrid has batteries that are light that offer higher energy density that are far more costly. ICEs require only a battery large enough to operate the electrical system and ignite the engine. 

 

Learning Objectives 

By completing this course, you will be able to identify, recognize or articulate: 

  • Various common EV and HEV powertrain architectures 
  • Concepts of regeneration and base / peak power loading prime mover (source) management 
  • Differences and similarities between series, parallel  and series-parallel hybrid powertrains 
  • The real cost of EVs 
  • Advantages, disadvantages and considerations of each major hybrid powertrain 

Who Should Attend 

This course is intended for those new to or just learning about hybrid transmission / transaxle technologies. It is intended as an introductory course, so anyone is invited to attend. 

 

Prerequisites 

None. 

 

Topics 

  • Hybrid Electric Vehicles (HEV) 
  • How hybrid drive systems generate, store and supply power 
  • Energy use in conventional vehicles 
  • Energy saving potential of hybrid drive trains 
  • Various HEV configurations and their operation modes 
  • The history of hybrids: series and parallel designs 
  • Design specifics of a powertrain to be used in a hybrid vehicle 
  • Concept of a power-split / power-combining device 
  • NVH as an issue for HEVs