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Technology Analysis of Advanced Exhaust Heat Recovery Systems in Passenger Cars

Technology Analysis of Advanced Exhaust Heat Recovery Systems in Passenger Cars

Technology Challenges:

Fuel economy, cost of technology, ease of integration/packaging, and durability/reliability goals have not been met, and the thermoelectric generator (TEG) and Rankine cycle exhaust heat recovery system (EHRS) technologies need significant development. Thus, OEMs expect the commercial implementation of these two technologies beyond 2020.

Technology Preference:

TEG is favoured as a more viable solution due to technological improvements, low technology cost, less packaging space/integration effort, and a better durability/reliability in comparison to Rankine cycle. OEMs are of the opinion that the Rankine cycle is less suitable for passenger car applications.

Rankine Engine Outlook & Challenges:

Rankine cycle cost, weight, and reliability are the major challenges for Rankine cycle recovery systems, which are unlikely to be commercialized before 2020. Honda is targeting Rankine cycle for hybrid application.

Exhaust Heat Recovery (Ehr) Technologies—Adoption Detterents:

High cost, complexity of integration, and low energy recovery potential of current generation of EHR technologies are a major deterrent for TEG and turbogenerator adoption.

About this report

Exhaust heat recovery (EHR) is a promising approach to reducing fuel consumption of future vehicles powered by internal combustion engines. Besides reducing exhaust emissions, EHR concepts focus on improving the use of primary energy. Irrespective of displacement, contemporary internal combustion engines convert less than 40% of the fuel energy used into mechanical energy. In low-load urban driving cycles, efficiency can fall below 20%. This study provides a strategic overview of EHR technologies in the passenger vehicle market in Europe and North America, including key R&D trends, market drivers and restraints, and adoption goals. Other objectives include analysing disruptive technology alerts and market direction by OEM from 2015 to 2022.


  • Executive Summary
    • Executive Summary-Key Findings
    • Executive Summary-Energy Conservation and Recovery Technologies Roadmap
    • Executive Summary-Performance Goals for EHR Technologies
    • Executive Summary-EHR Technology Development & Adoption Drivers
    • Executive Summary-OEM Considerations for EHR Technology Development
    • Executive Summary-Key Conclusions and Future Outlook
  • Research Scope, Objectives, Background, and Methodology
    • Research Scope
      • Table Passenger Vehicle Sales Forecast, Europe and North America, 2015-2022
    • Research Aims and Objectives
    • Key Questions this Study will Answer
    • Research Background and Methodology
    • Research Methodology
    • Key OEM/Participant Groups Compared in this Study
  • Definitions and Segmentation
    • Product/Technology Segmentation
    • Exhaust Heat Recovery Systems (EHRS)-Technology Scope & Definition
    • EHRS-Thermoelectric Generators
    • EHRS-Turbogenerator
    • Vehicle Segmentation
  • Market Analysis of EHR Technologies
    • Energy Conservation and Recovery Systems-Requirements
    • Exhaust Energy Recovery-Technologies Roadmap towards 2020
    • EHRS-Key Attributes
    • EHRS-Key Goals Targeted by OEMs
    • EHRS-OEM Interest Levels
    • EHRS-Technology Rollout Progression
  • OEM and Supplier Case Studies
    • EHRS-Case Study, BMW Group
    • EHRS-Case Study, Ford Motor Co.
    • EHRS-Case Study, Exoes Technologies
  • Conclusions and Future Outlook
    • Key Conclusions and Future Outlook
    • The Last Word-3 Big Predictions
  • Appendix
    • Market Engineering Methodology

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