Fuel Spray Analysis Near Nozzle Outlet of Fuel Injector During Valve Movement

Yasukawa, Yoshihito; Ishii, Eiji; Yoshimura, Kazuyoshi; Ogura, Kiyotaka

doi:10.1007/978-3-658-15327-4_17

Cited by 3 publications

(4 citation statements)

References 7 publications

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“…The impact of control parameters and nozzle geometry on the injection process and thermodynamic changes were examined. Similarly, in the article [43], Yosukawa et al analyzed the atomization of fuel escaping from the injector nozzle. Due to comparative simulations carried out using the laser Doppler method, the size of droplets formed was determined.…”

Section: Problem Specificationmentioning

confidence: 99%

“…Differences in magnitude of parameters, between the modelled time-related voltage and current waveform, relative to the waveforms measured on an ongoing basis, are the residual quantities that may constitute a diagnostic parameter enabling determination not only of the valve's technical condition [12,39], but also the type and size of the damage. As a result of detection of the change in residual value, indicating an early stage of the valve damage, the valve can be switched off operation or the parameters of its work corrected so as to minimise the wear effect without delay [7,38] before they can affect the system's reliability [40,43] This would be a proecological action, with a deep economic impact, since the occurrence of subsequent resultant engine and exhaust purification system damage is prevented.…”

Section: Problem Specificationmentioning

confidence: 99%

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New approach of model based detection of early stages of fuel injector failures

Mączak¹,

Więcławski²,

Szczurowski³

2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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The aim of the work was to develop a method of real time diagnosing electromagnetic fuel injectors using the observation of electric current parameters available in the engine control unit. Performing this task required finding a precise criterion for assessing the correct operation of an electromagnetic injector. For this purpose, a mathematical model describing the individual phases of the injector's operation was used, allowing the simulation of the occurrence of typical failures. On its basis, symptoms of particular failures were determined based on the observation of electric current parameters in the control circuit. Observation of voltage and current waveforms allows to locate both electrical and mechanical damages to the injectors and to assess the correctness of the power system components. The presented diagnostic method allows the detection of the described damages in the early stages of their development, which prevents damage to the catalytic converter and other engine systems (valves, piston rings or cylinder surfaces), i.e. damages resulting from an incorrect fuel mixture.

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Section: Problem Specificationmentioning

confidence: 99%

Section: Problem Specificationmentioning

confidence: 99%

New approach of model based detection of early stages of fuel injector failures

Mączak¹,

Więcławski²,

Szczurowski³

2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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“…Modeled are the flow through the injector nozzle and the needle displacements, for the relationship between the fuel flux and the injection pressure and temperature to be determined [ 15 , 16 , 17 ]. After the characteristics have been determined, they are verified for different control parameters.…”

Section: Introductionmentioning

confidence: 99%

Electric Current Waveform of the Injector as a Source of Diagnostic Information

Więcławski

Mączak

Szczurowski

2020

Sensors

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The article discusses the method of evaluation of the fuel injector operation based on the observation of the electric current parameters, which were measured with a current transducer using the Hall effect, during the dosing process. This method relies on comparison of the electric current-related values of the examined injector with the model characteristics, which are representing the properly functioning injector. A model of the fuel injector in the form of the electric current waveform that describes the changes in the electric current and voltage during its work is presented in this article. Complex equations describing the fuel injector model under discussion account for the characteristics of the current variations, with no damage-induced modifications. Due to these, the modeled electric current/voltage waveform mirrors the real conditions. The use of a mathematical model describing the voltage–current phenomena occurring during the injector operation allows determining the actual beginning and duration of the injection. The model can also be used to develop new injector diagnostic methods that can be implemented in the engine controller (ECU).

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“…など）、粒子法を用いた研究例は少ないという印象を受ける。SPH（Smoothed Particle Hydrodynamics）法 [8,9]では Dauch et al [10]の研究が、MPS（Moving Particle Semi-implicit）法 [11]では Duan et al [12]、 Ishii et al [13]、Sun et al [14]、Yasukawa et al [15] の研究が、例として挙げられる。ノズル内キャビテーション解析や噴霧解析に混相流 …”

unclassified

Numerical Simulation of Cavitation in a Nozzle and Liquid Jet Using Moving Particle Semi-implicit Method

章裕¹,

誠一²,

一樹³

et al. 2017

JAPANESE JOURNAL OF MULTIPHASE FLOW

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The fact that the spray characteristics of automotive fuel injectors of direct injection type are substantially influenced by cavitation in the nozzles is widely known. Many researchers have been engaged in understanding the relation between a cavitating flow and characteristics of fuel spray using a numerical simulation till now. In a free surface flow analysis and a multiphase flow analysis, advantages of using a particle-based meshless method are utilized. However, particle-based meshless methods have not been used to simulate cavitation. In this study, the cavitation in a two-dimensional nozzle and the water jet were simulated using Moving Particle Semi-implicit (MPS) method employing a cavitation model. The simulation results are relatively close to experimental data.

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Fuel Spray Analysis Near Nozzle Outlet of Fuel Injector During Valve Movement

Cited by 3 publications

References 7 publications

New approach of model based detection of early stages of fuel injector failures

New approach of model based detection of early stages of fuel injector failures

Electric Current Waveform of the Injector as a Source of Diagnostic Information

Numerical Simulation of Cavitation in a Nozzle and Liquid Jet Using Moving Particle Semi-implicit Method

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