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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Main Authors: Qiuyu Liu, Baitan Ma, Zhiqiang Zhang, Chunyun Fu, Zhe Kang
Format: Article
Language:English
Published: MDPI AG 2025-08-01
Series:Energies
Subjects:
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
collection DOAJ
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.
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institution DOAJ
issn 1996-1073
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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
work_keys_str_mv AT qiuyuliu potentialissuesandoptimizationsolutionsforhighcompressionratioutilizationinhybriddedicatedgasolineengines
AT baitanma potentialissuesandoptimizationsolutionsforhighcompressionratioutilizationinhybriddedicatedgasolineengines
AT zhiqiangzhang potentialissuesandoptimizationsolutionsforhighcompressionratioutilizationinhybriddedicatedgasolineengines
AT chunyunfu potentialissuesandoptimizationsolutionsforhighcompressionratioutilizationinhybriddedicatedgasolineengines
AT zhekang potentialissuesandoptimizationsolutionsforhighcompressionratioutilizationinhybriddedicatedgasolineengines