Multi-load knock detection of a marine micro-ignition diesel (DI) -natural gas (PFI) dual-fuel engine based on in-cylinder pressure signals

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-02-18 DOI:10.1016/j.csite.2025.105918

Nao Hu , Fuze Liu , Jianguo Yang , Xianquan Zheng , Liangtao Xie , Hongmei Li , Gang Chen , He Zhao

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引用次数: 0

Abstract

A new knock definition was proposed to satisfy the unified knock detection under various engine loads based on in-cylinder pressure signals. Knock indices such as maximum amplitude pressure oscillation (MAPO), maximum pressure rise rate (MPRR), peak pressure (P_max), arithmetic mean, standard deviation and so on were investigated.

The standard deviation and arithmetic mean were found to have a high correlation with MAPO. However, these knock indicators cannot use a fixed value to meet the requirements of knock detection under different engine loads. Time-frequency analysis was conducted to investigate the knock characteristics under various engine loads. There is a significant increase in the energy of 8–12 kHz frequency domain when knock occurs, which may use for effective knock detection. Further analysis of the cylinder pressure signal by using Discrete Wavelet Transform (DWT) revealed that the energy proportion of the 8–12 kHz energy segment in the D2 sub-band can well distinguish the knock phenomenon under different engine loads. Therefore, a new definition P_n which clearly distinguishes the knock cycles from normal cycles regardless of engine loads was proposed and validated by comparing it to the MAPO.

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.