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Possibility to Determine Diesel Engine Condition and Tuning from the Application of a Diagnostic Technique at a Single Operating Point

机译：可能在单个操作点处确定柴油发动机状况和调整诊断技术的调整

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A difficulty which exists when applying diagnostic techniques on large-scale diesel engines operating on the field, is that usually it is not possible to obtain measurement data at a wide engine operating range due to a number of constraints. In the present work is investigated the possibility to overcome this practical difficulty originating from the test procedure for engines operating on the field (i.e., marine or stationary applications). The main objective is to examine if a diagnosis procedure provides similar results when applied at various engine operating conditions. For this purpose an existing diagnostic technique, developed by the authors, is applied at different operating conditions on a large-scale two-stroke diesel engine used for power generation in a Greek island. From the diagnosis analysis, several engine operating parameters (i.e., peak firing pressure, cylinder fuel flow, brake power output, injection advance, etc.) are estimated at each operating point, as well as the current operational condition of the engine and its subsystems (i.e., compression condition, compressor and turbine condition, etc.). From the comparison of the diagnosis results (i.e., operating parameters, engine condition and tuning) at all operating points examined, rather similar results are obtained, regardless of the operating point at which the diagnosis is applied. However, at one operating point, the diagnosis results differ, which as revealed is attributed to load variation during measurement. For this reason, the diagnostic technique has been modified to account for load variation during a measurement. From the present analysis, it is shown that it is possible to estimate engine current condition and tuning from the application of the proposed diagnostic technique at a single operating point, since most of diagnosis results are similar, regardless of the operating point at which diagnosis is applied. This is a serious advantage of the proposed technique, especially for large-scale diesel engines (i.e., marine), where it is not easy to perform measurements at a wide engine operating range, as required.
机译：上的场经营的大型柴油发动机施加的诊断技术时存在的困难是，通常它是不能够得到在宽的发动机运行范围的测量数据由于一些约束。在目前的工作进行了研究，以克服从所述测试程序中的该实际困难始发用于在字段（即，船用或固定应用程序）运行的发动机的可能性。的主要目的是研究是否当在各种发动机操作条件施加的诊断过程提供类似的结果。用于此目的的现有的诊断技术，由作者开发的，在不同的操作条件施加在希腊小岛用于发电规模的大型二冲程柴油发动机。从诊断分析，若干发动机运行参数（即，峰值燃烧压力，汽缸的燃料流，制动功率输出，喷油提前等）估计每个工作点，以及在发动机及其子系统的当前操作条件（即，压缩状态，压缩机和涡轮机条件，等等）。从诊断结果的比较（即，操作参数，发动机状态和调谐）在所有操作点检测时，获得相当类似的结果，而不管在应用了诊断操作点。然而，在一个操作点，诊断结果不同，这所揭示的测量期间归因于负载的变化。出于这个原因，该诊断技术已经在测量期间修改以考虑负载变化。从本分析，结果表明，有可能在一个单一的操作点从所提出的诊断技术的应用估计引擎电流条件和调整，因为大多数诊断结果是相似的，而不管工作点在该诊断是应用。这是所提出的技术的一个严重的优点，特别是对于大型柴油发动机（即，海洋），在那里它不容易在宽发动机运行范围执行测量，根据需要。

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