Research on Mode Switching Control Strategy of Marine Diesel/Natural Gas Dual Fuel Engines

doi:10.3969/j.issn.1004-132X.2022.04.002

Abstract

Abstract: In the actual operations of marine diesel/natural gas dual-fuel engines， switching between pure diesel mode and dual-fuel mode might easily cause large engine speed fluctuations and unstable operations， which endanger the normal operations of the engines. In addition， in some emergencies（such as insufficient natural gas fuel， sudden load unloading， et al）， the engine needed to switch between different modes quickly and smoothly. In response to the demands， a rule-based dual-fuel engine mode switching control strategy was designed based on the operating requirements and mechanism of the dual-fuel engine under the premise of the same control system hardware. Among them， the diesel-to-dual-fuel mode adopted the reverse control method， and the dual-fuel-to-diesel mode was divided into active switching and passive switching to respond to different control requirements. The designed switching control strategy realized the mutual switching of different fuel modes based on experimental calibration data and software algorithms. Finally， an experimental platform was built to verify different operating conditions mode switching control performance based on the YC6K dual-fuel engine. The results show that the designed switching strategy satisfies the switching control requirements under various working conditions， and improves the running performance of the whole machine.

Key words: , dual-fuel engine, fuel mode switching, reverse control, active switching, passive switching

摘要： 船用柴油/天然气双燃料发动机在实际运行过程中，纯柴油模式与双燃料模式之间的切换极易造成发动机转速波动大、运行不稳定等情况，危害发动机的正常运行，此外，一些紧急情况（如天然气燃料不足、负荷突卸等）下，发动机需要快速平稳地完成不同模式的切换。针对这一需求，在控制系统硬件不变的前提下，根据双燃料发动机运行需求和机理，设计了基于规则的双燃料发动机模式切换控制策略，其中，柴油转双燃料模式采用倒逼控制方法，双燃料转柴油模式分为主动切换与被动切换以应对不同控制需求。所设计的切换控制策略根据实验标定数据和软件算法，实现了不同燃料模式的相互切换。最后，搭建了基于YC6K双燃料发动机实验平台，验证了不同运行工况下的模式切换控制性能。结果表明：所设计的切换控制策略满足各工况下的切换控制需求，提高了整机运行性能。

关键词: 双燃料发动机, 燃料模式切换, 倒逼控制, 主动切换, 被动切换

CLC Number:

TK46

SONG Enzhe, JIANG Zhongzhou, YAO Chong, ZHAO Guofeng. Research on Mode Switching Control Strategy of Marine Diesel/Natural Gas Dual Fuel Engines[J]. China Mechanical Engineering, 2022, 33(04): 388-396.

宋恩哲, 蒋中州, 姚崇, 赵国锋. 船用柴油/天然气双燃料发动机模式切换控制策略研究[J]. 中国机械工程, 2022, 33(04): 388-396.

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