Potential Issues and Optimization Solutions for High-Compression-Ratio Utilization in Hybrid-Dedicated Gasoline Engines
This systematic review critically examines the benefits and challenges of high-compression-ratio (CR) implementation in hybrid-dedicated engines, recognizing CR increase as a pivotal strategy for enhancing the indicated thermal efficiency to achieve carbon peak and carbon neutrality goals. However,...
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| Language: | English |
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MDPI AG
2025-08-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/18/15/4204 |
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| author | Qiuyu Liu Baitan Ma Zhiqiang Zhang Chunyun Fu Zhe Kang |
| author_facet | Qiuyu Liu Baitan Ma Zhiqiang Zhang Chunyun Fu Zhe Kang |
| author_sort | Qiuyu Liu |
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| description | This systematic review critically examines the benefits and challenges of high-compression-ratio (CR) implementation in hybrid-dedicated engines, recognizing CR increase as a pivotal strategy for enhancing the indicated thermal efficiency to achieve carbon peak and carbon neutrality goals. However, excessively high CRs face critical constraints, including intensified knock propensity, increased heat transfer (HTR) losses, reduced combustion stability, augmented dissociation losses, and cold-start misfire risks. The feasibility and necessity of CR enhancement in hybrid systems were comprehensively evaluated based on these factors, with fundamental mechanisms of the detrimental effects elucidated. To address these challenges, optimized countermeasures were synthesized: knock suppression via high-octane fuels, EGR technology, lean combustion, and in-cylinder water injection; heat transfer reduction through thermal barrier coatings and independent CR/expansion-ratio control; misfire risk monitoring using ion current or cylinder pressure sensors. These approaches provide viable pathways to overcome high-CR limitations and optimize engine performance. Nevertheless, current research remains confined to isolated solutions, warranting future focus on integrated optimization mechanisms investigating synergistic interactions of multiple strategies under high-CR conditions. |
| format | Article |
| id | doaj-art-1f4806775da243febd0b3864d964d830 |
| institution | DOAJ |
| issn | 1996-1073 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj-art-1f4806775da243febd0b3864d964d8302025-08-20T03:02:58ZengMDPI AGEnergies1996-10732025-08-011815420410.3390/en18154204Potential Issues and Optimization Solutions for High-Compression-Ratio Utilization in Hybrid-Dedicated Gasoline EnginesQiuyu Liu0Baitan Ma1Zhiqiang Zhang2Chunyun Fu3Zhe Kang4State Key Laboratory of Mechanical Transmission for Advanced Equipment, Chongqing University, Chongqing 400044, ChinaDongfeng Liuzhou Motor Compoany Limited, Liuzhou 545005, ChinaDongfeng Liuzhou Motor Compoany Limited, Liuzhou 545005, ChinaState Key Laboratory of Mechanical Transmission for Advanced Equipment, Chongqing University, Chongqing 400044, ChinaState Key Laboratory of Mechanical Transmission for Advanced Equipment, Chongqing University, Chongqing 400044, ChinaThis systematic review critically examines the benefits and challenges of high-compression-ratio (CR) implementation in hybrid-dedicated engines, recognizing CR increase as a pivotal strategy for enhancing the indicated thermal efficiency to achieve carbon peak and carbon neutrality goals. However, excessively high CRs face critical constraints, including intensified knock propensity, increased heat transfer (HTR) losses, reduced combustion stability, augmented dissociation losses, and cold-start misfire risks. The feasibility and necessity of CR enhancement in hybrid systems were comprehensively evaluated based on these factors, with fundamental mechanisms of the detrimental effects elucidated. To address these challenges, optimized countermeasures were synthesized: knock suppression via high-octane fuels, EGR technology, lean combustion, and in-cylinder water injection; heat transfer reduction through thermal barrier coatings and independent CR/expansion-ratio control; misfire risk monitoring using ion current or cylinder pressure sensors. These approaches provide viable pathways to overcome high-CR limitations and optimize engine performance. Nevertheless, current research remains confined to isolated solutions, warranting future focus on integrated optimization mechanisms investigating synergistic interactions of multiple strategies under high-CR conditions.https://www.mdpi.com/1996-1073/18/15/4204hybrid enginehigh compression ratioindicated thermal efficiencyknock controlheat transfer lossesoptimization strategy |
| spellingShingle | Qiuyu Liu Baitan Ma Zhiqiang Zhang Chunyun Fu Zhe Kang Potential Issues and Optimization Solutions for High-Compression-Ratio Utilization in Hybrid-Dedicated Gasoline Engines Energies hybrid engine high compression ratio indicated thermal efficiency knock control heat transfer losses optimization strategy |
| title | Potential Issues and Optimization Solutions for High-Compression-Ratio Utilization in Hybrid-Dedicated Gasoline Engines |
| title_full | Potential Issues and Optimization Solutions for High-Compression-Ratio Utilization in Hybrid-Dedicated Gasoline Engines |
| title_fullStr | Potential Issues and Optimization Solutions for High-Compression-Ratio Utilization in Hybrid-Dedicated Gasoline Engines |
| title_full_unstemmed | Potential Issues and Optimization Solutions for High-Compression-Ratio Utilization in Hybrid-Dedicated Gasoline Engines |
| title_short | Potential Issues and Optimization Solutions for High-Compression-Ratio Utilization in Hybrid-Dedicated Gasoline Engines |
| title_sort | potential issues and optimization solutions for high compression ratio utilization in hybrid dedicated gasoline engines |
| topic | hybrid engine high compression ratio indicated thermal efficiency knock control heat transfer losses optimization strategy |
| url | https://www.mdpi.com/1996-1073/18/15/4204 |
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