Torsional system dynamics of low speed diesel engines based on instantaneous torque: Application to engine diagnosis

Guerrero, Daniel Palomo; Aguilar, Francisco José Jiménez-Espadafor

doi:10.1016/j.ymssp.2018.06.051

Cited by 38 publications

(23 citation statements)

References 20 publications

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“…The technical condition of an engine exerts direct impact on the course of the working process occurring in the engine cylinders. Consequently it has an impact on fluctuations of the angular velocity of its crankshaft [3,9,10]. Fluctuations of the angular velocity of the crankshaft translate into fluctuations of the angular velocity of the generator rotor.…”

Section: Assumptions Of the Methodsmentioning

confidence: 99%

Method of evaluation of the technical condition of the diesel-electric unit

Zacharewicz

2019

Diagnostyka

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The article presents an innovative method of evaluating technical condition of marine diesel engines driving electric power generator. The presented method is based on measurements of the phase-to-phase voltage of the synchronous generator and on measurements of the acceleration of the injector needle. The basis for the method is an assumption that the shapes of the waveforms of the phase-to-phase voltage of the generator include information on fluctuations of the angular velocity of the engine crankshaft. Consequently, these fluctuations depend directly on the course of the working process occurring in the engine cylinders. The vibrating signal is used to synchronize the shapes of the voltage waveforms with the engine working process.Keywords: marine diesel engines, diagnostic, diesel-electric unit METODA OCENY STANU TECHNICZNEGO OKRĘTOWEGO ZESPOŁU SPALINOWO-ELEKTRYCZNEGO Streszczenie W artykule przedstawiono nowatorską metodę oceny stanu technicznego okrętowych tłokowych silników spalinowych o zapłonie samoczynnym napędzających prądnice. Prezentowana metoda bazuje na pomiarach napięcia międzyfazowego prądnicy synchronicznej oraz na pomiarze przyspieszeń iglicy wtryskiwacza. Podstawą metody jest założenie, że przebiegi napięcia międzyfazowego prądnicy zawierają informację o fluktuacjach prędkości kątowej wału korbowego silnika. Natomiast fluktuacje te zależą bezpośrednio od przebiegu procesu roboczego realizowanego w cylindrach silnika. Sygnał drganiowy wykorzystywany jest do synchronizacji przebiegów napięcia z cyklem roboczym silnika.Słowa kluczowe: Okrętowy tłokowy silnik spalinowy, diagnostyka, zespół spalinowo-elektryczny

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Section: Assumptions Of the Methodsmentioning

confidence: 99%

Method of evaluation of the technical condition of the diesel-electric unit

Zacharewicz

2019

Diagnostyka

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“…The system works as follows: an electromagnet (31), whose operation is controlled by the electronic control unit of the nozzles (11), is added to the fuel supply system of the engine with a mechanical cable throttle actuator. The core of the electromagnet is connected to the tension roller (27) through which the control cable passes to the throttle (28).…”

Section: Working Out the Fuel Supply Systemmentioning

confidence: 99%

“…With partial loads and idling mode running, the electric current of the electromagnet (30) is activated by the command of the electronic control unit (11) to the coil relay switching the electromagnet. When the electromagnet (31) switches on, its core moves the tension roller (27) to a predetermined value ∆l. As a result of it the opening angle of the throttle (17) is changed to a predetermined value according to the engine operation with the cylinders switched off.…”

Section: Working Out the Fuel Supply Systemmentioning

confidence: 99%

“…With an increase in the engine load to a mode where the operation with a subset of cylinders becomes less economical with respect to fuel consumption than with all cylinders, at the same crankshaft rotation frequency, the electronic control unit of the nozzles (11), according to the signal of the position sensor of the throttle valve (16), connects the block of the inactive nozzles (10) to the fuel supply system. At the same time, electromagnet (31) controls the tension roller (27). The angle of opening the throttle (17) changes to the value corresponding to the engine operation with all cylinders.…”

Section: Working Out the Fuel Supply Systemmentioning

confidence: 99%

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Improving Fuel Economy of Spark Ignition Engines Applying the Combined Method of Power Regulation

et al. 2020

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One of the disadvantages of spark ignition engines, whose power is regulated by throttling, is the increased fuel consumption at low loads and when the engine is idle. The combined method of engine power regulation by switching off the cylinder group and throttling working cylinders is one of the effective ways to improve fuel economy in the above-mentioned modes. This article presents the research results of the combined method of engine power regulation which can be realized by minor structural changes in operating conditions. The method implies the following: at low loads and at idle speed of the engine. Fuel supply to the group of cylinders is switched off with the simultaneous increase of the cyclic fuel supply in the working cylinders. The adequacy of the calculated results has been checked by the indication of operating processes in switched off and working cylinders. The research results of a six-cylinder spark ignition engine with the distributed gasoline injection using the combined power regulation system have been shown. The angles of opening the throttle which provides a non-shock transition from the operation with all cylinders to the operation with the cylinder group switched off have been determined.Energies 2020, 13, 1076 2 of 19 forced idling. In this case, most of the time cars move at a low speed, with the engine running at low loads and at idle speed.Operating modes of automobile engines under operating conditions have been investigated in many papers. At low speed and low load, high heat transfer and combustion losses occur, directly affecting engine operating conditions [1]. In most cases, these actual engine operating conditions are not reflected in standardized driving cycles and, sometimes, summaries of experimentally-derived cycles are also used to evaluate traffic jams [2]. Design changes, such as ceramic-coated engines, have also been used to reduce heat loss, which, when used in combination with biodiesel as fuel, have shown optimum engine operating conditions [3]. This effect is also noticeable when using triglyceride-based biodiesel as fuel [4]. Hydroxyl gas can also be used as an indicator to improve engine natural conditions, resulting in higher thermal efficiency and improved exhaust emissions [5]. The possible use of biobutanol as another source of biofuels and similar trends in engine operating conditions due to its higher oxidative stability [6] as a spark ignition [7], as a compression ignition engines [8]. It is also known that the use of alcohol additives in petrol improves its properties and achieves an ecological effect [9]. The EGR system shows a different reduction in cycle pressure [10] which is noticeable when operating small engines [11]. Studies [12][13][14][15] shows that the basic operating modes of both freight and passenger vehicles moving in cities are part speed and loading modes. They involve acceleration, steady mode, and active and forced idling while driving and braking the car. Most of the time the vehicular engines run the open throttle or with a fuel s...

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“…However, the real-time control of internal combustion engine working nonuniformity is not as important as misfire detection [28][29][30][31][32] . The instantaneous speed measurement of engine is very convenient, economical, reliable, and does not cause interference [33][34][35][36][37][38][39] . Instantaneous speed is closely related to cylinder pressure and drive torque acting on the crankshaft.…”

Section: Introductionmentioning

confidence: 99%

Research On Fuel Compensation Control of High-pressure Common-Rail Diesel Engine Based On Crankshaft Segment Signals

Wang

Yao

et al. 2021

Preprint

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This paper studies the high-pressure common-rail diesel engine fuel supply compensation based on crankshaft fragment signals in order to improve the uneven phenomenon of diesel engine fuel supply and realize high efficiency and low pollution combustion. The experiments were conducted on a diesel engine with the model of YN30CR. Based on the characteristics of crankshaft fragment signals, the proportional integral (PI) control algorithm was used to quantify the engine working nonuniformity and extract the missing degree of fuel injection. The quantization method of each cylinder working uniformity and algorithm of fuel compensation control (FOC) based on crankshaft fragment signal were established, and the control strategy of working uniformity at different operating conditions was put forward. According to the principle of FOC control, a FOC control software module for ECU was designed. The FOC software module was simulated on ASCET platform. The results show that: Compared with the traditional quantization method, the oil compensation information extracted from crankshaft fragment signal has stronger anti-interference and more accurate parameters. FOC algorithm can accurately reflect the engine's working nonuniformity, and the control of the nonuniformity is reasonable. The compensation fuel amount calculated by FOC is high consistency with the fuel supply state of each cylinder set by experiment, which meets the requirement of accurate fuel injection control of common-rail diesel engine.

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Torsional system dynamics of low speed diesel engines based on instantaneous torque: Application to engine diagnosis

Cited by 38 publications

References 20 publications

Method of evaluation of the technical condition of the diesel-electric unit

Method of evaluation of the technical condition of the diesel-electric unit

Improving Fuel Economy of Spark Ignition Engines Applying the Combined Method of Power Regulation

Research On Fuel Compensation Control of High-pressure Common-Rail Diesel Engine Based On Crankshaft Segment Signals

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