This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Development of Advanced Non-Bypass Exhaust Heat Recovery System Using Highly Heat-Conductive SiC Honeycomb
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 02, 2019 by SAE International in United States
Annotation ability available
An exhaust heat recovery (EHR) system is an effective and attractive means of improving fuel economy and in-vehicle comfort, especially of hybrid cars in winter. However, many conventional bypass systems, which have a bypass pipe and bypass valve with a thermal actuator, are still large and heavy, and it is necessary not only to effectively improve the heat recovery but also to minimize the size and weight of EHR systems. Sakuma et al. reported new-concept heat exchangers and EHR systems using a highly heat-conductive SiC honeycomb, including a non-bypass system. However, since this non-bypass system always recovers heat from the exhaust gas, its heat recovery performance was set so as not to exceed the cooling capability of the radiator at a high engine load to prevent overheating of the vehicle. Therefore, it is necessary to both reduce the recovered heat at a high engine load or high coolant temperature and improve the recovered heat at a low engine load or low coolant temperature for the non-bypass system. This paper proposes an advanced non-bypass EHR system with a double-layered coolant passage structure for automatically limiting the amount of recovered heat depending on the coolant temperature or engine load instead of a bypass valve mechanism. This advanced system can realize both effective heat recovery in an engine warm-up phase and heat rejection at a high engine load or high coolant temperature. This paper explains the basic concept of the advanced non-bypass EHR system and analyzes vehicle results obtained with this prototype, which showed high heat recovery performance in the cold-start phase and high heat rejection performance at a high engine load.
CitationSakuma, T., Yoshihara, M., Kawaguchi, T., Hamada, T. et al., "Development of Advanced Non-Bypass Exhaust Heat Recovery System Using Highly Heat-Conductive SiC Honeycomb," SAE Technical Paper 2019-01-0153, 2019, https://doi.org/10.4271/2019-01-0153.
- Diehl , P. , Haubner , F. , Klopstein , S. , and Koch , F. Exhaust Heat Recovery System for Modern Cars SAE Technical Paper 2001-01-1020 2001 10.4271/2001-01-1020
- Nakagawa , T. , Tsubouchi , M. , and Suzuki , M. Exhaust Heat Recirculation System for Fuel Economy Improvement Review of Automotive Engineering 29 4 527 532 2008
- Chiew , L. , Clegg , M. , Willats , R. , Delplanque , G. et al. Waste Heat Energy Harvesting for Improving Vehicle Efficiency SAE Int. J. Mater. Manuf. 4 1 1211 1220 2011 10.4271/2011-01-1167
- Conlon , B. , Barth , M. , Hua , C. , Lyons , C. et al. Development of Hybrid-Electric Propulsion System for 2016 Chevrolet Malibu SAE Int. J. Alt. Power. 5 2 259 271 2016 10.4271/2016-01-1169
- Lee , J. , Ohn , H. , Choi , J. , Kim , S. et al. Development of Effective Exhaust Gas Heat Recovery System for a Hybrid Electric Vehicle SAE Technical Paper 2011-01-1171 2011 10.4271/2011-01-1171
- Murata , T. , Nakagawa , T. , Nishino , H. , and Matsuura , K. Efficiency Improvement in Exhaust Heat Recirculation System SAE Technical Paper 2016-01-0184 2016 10.4271/2016-01-0184
- Sakuma , T. , Kawaguchi , T. , Kimura , D. , Yoshihara , M. et al. Development of Exhaust Heat Recovery System Using Highly Heat-Conductive SiC Honeycomb SAE Technical Paper 2018-01-0048 2018 10.4271/2018-01-0048