Study of control strategy for cylinder-to-cylinder combustion homogeneity of marine medium-speed diesel engines

IF 5.4 2区计算机科学 Q1 AUTOMATION & CONTROL SYSTEMS

Control Engineering Practice Pub Date : 2024-11-04 DOI:10.1016/j.conengprac.2024.106156

Shunhua Ou , Yonghua Yu , Nao Hu , Lei Hu , Jianguo Yang

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引用次数: 0

Abstract

Closed-loop combustion control (CLCC) is an efficient method for minimizing cylinder-to-cylinder combustion variation by adjusting individual cylinder fuel injection parameters. It is complementary to the closed-loop speed control, which precisely controls the engine speed by manipulating the global fuel injection parameters. However, the application of CLCC changed the conventional closed-loop speed control to a complex control structure. In addition, the selection of combustion control parameters will not only influence the combustion heat release control precisely, but also lead to increased calibration effort for the combustion controller. In this research, a triple closed-loop control strategy, in conjunction with a set-point online generation method, was proposed to improve the cylinder-to-cylinder combustion homogeneity, maintain the desired engine speed, and reduce the calibration effort simultaneously. A coefficient of variation in crank angle domain was utilized to analyze the cylinder-to-cylinder combustion homogeneity. The triple closed-loop control strategy was implemented on a marine medium-speed diesel engine. The experimental results indicated that the proposed control strategy, compared with the speed & IMEP (indicated mean effective pressure) cooperative control and speed & MFB50 (crank angle when 50 % fuel is consumed) cooperative control, has a better potential to alleviate cylinder-to-cylinder pressure variations at the same crankshaft angle. The cylinder-to-cylinder variation of IMEP and MFB50 decreased by 61 % and 38 % compared to the closed-loop speed control, respectively. The cylinder-to-cylinder combustion inhomogeneity, resulting from engine long-time operation and ambient conditions change, was significantly reduced as well. Therefore, the proposed strategy provides a multi-objective precise control method that allows the extension to low-carbon and zero-carbon marine engines.

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船用中速柴油机汽缸间燃烧均匀性控制策略研究

闭环燃烧控制（CLCC）是一种通过调整单个气缸的燃油喷射参数来最大限度减少气缸间燃烧变化的有效方法。它是闭环转速控制的补充，后者通过操纵全局喷油参数来精确控制发动机转速。然而，CLCC 的应用改变了传统的闭环转速控制，使其成为一种复杂的控制结构。此外，燃烧控制参数的选择不仅会影响燃烧放热的精确控制，还会导致燃烧控制器的标定工作量增加。本研究提出了一种三重闭环控制策略，并结合设定点在线生成方法，以改善缸与缸之间的燃烧均匀性，保持理想的发动机转速，并同时减少标定工作量。利用曲柄角域的变化系数分析了气缸到气缸的燃烧均匀性。在船用中速柴油机上实施了三重闭环控制策略。实验结果表明，与转速& IMEP（指示平均有效压力）协同控制和转速& MFB50（消耗 50% 燃料时的曲柄角）协同控制相比，所提出的控制策略在相同曲轴角度下具有更好的缓解气缸到气缸压力变化的潜力。与闭环转速控制相比，IMEP 和 MFB50 的气缸间变化分别减少了 61% 和 38%。发动机长时间运行和环境条件变化导致的气缸间燃烧不均匀性也显著降低。因此，所提出的策略提供了一种多目标精确控制方法，可扩展到低碳和零碳船用发动机。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Control Engineering Practice 工程技术-工程：电子与电气

CiteScore

9.20

自引率

12.20%

发文量

183

审稿时长

44 days

期刊介绍： Control Engineering Practice strives to meet the needs of industrial practitioners and industrially related academics and researchers. It publishes papers which illustrate the direct application of control theory and its supporting tools in all possible areas of automation. As a result, the journal only contains papers which can be considered to have made significant contributions to the application of advanced control techniques. It is normally expected that practical results should be included, but where simulation only studies are available, it is necessary to demonstrate that the simulation model is representative of a genuine application. Strictly theoretical papers will find a more appropriate home in Control Engineering Practice''s sister publication, Automatica. It is also expected that papers are innovative with respect to the state of the art and are sufficiently detailed for a reader to be able to duplicate the main results of the paper (supplementary material, including datasets, tables, code and any relevant interactive material can be made available and downloaded from the website). The benefits of the presented methods must be made very clear and the new techniques must be compared and contrasted with results obtained using existing methods. Moreover, a thorough analysis of failures that may happen in the design process and implementation can also be part of the paper. The scope of Control Engineering Practice matches the activities of IFAC. Papers demonstrating the contribution of automation and control in improving the performance, quality, productivity, sustainability, resource and energy efficiency, and the manageability of systems and processes for the benefit of mankind and are relevant to industrial practitioners are most welcome.