Model-based diagnosis of large diesel engines based on angular speed variations of the crankshaft

Desbazeille, M.; Randall, R.B.; Guillet, François; Badaoui, Mohamed El; Hoisnard, C.

doi:10.1016/j.ymssp.2009.12.004

Cited by 102 publications

(71 citation statements)

References 12 publications

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“…The torsional stiffnesses of diesel crankshaft and the shaft of generator are far larger than that of flexible coupling. 13 Hence, the torsional angle of left hand of the flexible coupling is close to that of the front end of the diesel generator set, and the torsional angle of right hand of the flexible coupling is close to that of the rear end of the diesel generator set. It is assumed that the relative torsional angles at the ends of flexible coupling can be replaced by those at the ends of diesel generator set.…”

Section: Measurement System Configuration Of Double-encodermentioning

confidence: 77%

Online measurement of torsional stiffness and fault analysis for flexible coupling under working condition

Guo

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, a method of measuring the relative torsional angles of the flexible coupling under working condition was developed. A double-encoder measurement system was proposed to get the torsional angles. The torsional angles were divided into ''constant torsional angle'' and ''alternating torsional angle''. The measured results were analyzed further, which were applied to a series of flexible couplings. Firstly, the torsional stiffness of D-type flexible coupling was obtained according to the relationship between torques and torsional angles. The proposed method overcomes the difficulty that the angular displacements of flexible coupling cannot be measured online under operating condition. The feasibility and accuracy of the method developed in this study was verified by comparing stiffness curve with unloading curve obtained from static torsional experiment and values from factory inspection report. Furthermore, in view of the tear fault of Atype flexible coupling in a diesel generator set, the maximum alternating torsional angles of A-type, B-type, and C-type flexible couplings were measured under working condition, then safety margins were obtained for the diesel generator set. According to the safety margins of the three kinds of couplings, C-type flexible coupling is chosen to replace A-type, which provided the basis for type selection of flexible coupling. Finally, the method developed in this study would also be applied to the operation monitoring and fault diagnosis of flexible coupling online.

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Section: Measurement System Configuration Of Double-encodermentioning

confidence: 77%

Online measurement of torsional stiffness and fault analysis for flexible coupling under working condition

Guo

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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show abstract

“…In addition, several important work have identified crankshaft classification. An automated diagnosis using an artificially intelligent system was proposed by [11] to monitor large diesel engines by analysing a crankshaft's angular speed variations and identifying a failure risk level at a greatest cost concern. Linear parametric classifiers were applied by [12] to diagnose misfire in internal combustion engines by using crank-angle domain digital filters to extract features from the measured engine speed signal, one of the characteristics of a misfire.…”

Section: Introductionmentioning

confidence: 99%

Classification of crankshaft remanufacturing using Mahalanobis-Taguchi system

Abu

Jamaluddin

Zakaria

2022

Int. J. Automot. Mech. Eng.

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Remanufacturing is a process of returning a used product to at least its original performance with a warranty that is equivalent or better than that of a newly manufactured product. During a preliminary inspection on remanufacturing companies, it was found that there is no end life for crankshafts in terms of classifying it either to remanufacture, repair or reject due to limited information provided by the original equipment manufacturer. The manufacturer did not provide any information on the annual quantity produced and their specifications to the remanufacturing company for the purpose of referencing. Eventually, the distinctiveness of the remanufactured crankshaft from the original cannot be measured. Thus, the aim of this work is to classify crankshafts' end life into recovery operations based on the Mahalanobis-Taguchi System. The crankpin diameter of six engine models were measured in order to develop a scale that represents their population in a scatter diagram. It was found that on the diagram of each engine model, the left distributions from the center point belong to rejected crankshafts, the right distributions belong to re-manufacturable crankshafts, and the upper distributions belong to the repairable crankshafts. The developed scale is believed to be able to help remanufacturers instantaneously identify and match any unknown model crankshafts to its right category. The Ministry of International Trade & Industry (MITI) has established a remanufacturing policy under RMK11 and put in efforts to encourage Malaysians to venture into the remanufacturing business. Thus, this model will help the industry to understand and formulate their decision-making to sustain the end of life of their products.

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“…Three methodologies are commonly used in crankshaft speed-based torque estimation, consisting of black-box model-based estimation, frequency analysis-based mapping, and crankshaft dynamic model-based estimation [13]. The first solution is to use a black-box model (such as a neural network and nominal function) to describe the relationship between the engine torque and crankshaft instantaneous speed [14][15][16][17][18]. However, these methods need an amount of data to train the black-box model.…”

Section: Introductionmentioning

confidence: 99%

A Control-Oriented Engine Torque Online Estimation Approach for Gasoline Engines Based on In-Cycle Crankshaft Speed Dynamics

et al. 2019

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Engine brake torque is a key feedback variable for the optimal torque split control of an engine–motor hybrid powertrain system. Due to the limitations in available sensors, however, engine torque is difficult to measure directly. For torque estimation, the unknown external load torque and the overlap of the expansion stroke between cylinders introduce a great disturbance to engine speed dynamics. This makes the conventional cycle average engine speed-based estimation approach unusable. In this article, an in-cycle crankshaft speed-based indicated torque estimation approach is proposed for a four-cylinder engine. First, a unique crankshaft angle window is selected for load torque estimation without the influence of combustion torque. Then, an in-cycle angle-domain crankshaft speed dynamic model is developed for engine indicated torque estimation. To account for the effects of model inaccuracy and unknown external disturbances, a “total disturbance” term is introduced. The total disturbance is then estimated by an adaptive observer using the engine’s historical operating data. Finally, a real-time correction method for the friction torque is proposed in the fuel cut-off scenario. Combining the aforementioned torque estimators, the brake torque can be obtained. The proposed algorithm is implemented in an in-house developed multi-core engine control unit (ECU). Experimental validation results on an engine test bench show that the algorithm’s execution time is about 3.2 ms, and the estimation error of the brake torque is within 5%. Therefore, the proposed method is a promising way to accurately estimate engine torque in real-time.

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Model-based diagnosis of large diesel engines based on angular speed variations of the crankshaft

Cited by 102 publications

References 12 publications

Online measurement of torsional stiffness and fault analysis for flexible coupling under working condition

Online measurement of torsional stiffness and fault analysis for flexible coupling under working condition

Classification of crankshaft remanufacturing using Mahalanobis-Taguchi system

A Control-Oriented Engine Torque Online Estimation Approach for Gasoline Engines Based on In-Cycle Crankshaft Speed Dynamics

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