Accurate Modelling of an Injector for Common Rail Systems

Summary We propose a model‐based method that allows to estimate the magnetic force accurately, hence the armature displacement of linear solenoids. The nonlinear electrodynamical model of solenoids is used. The unscented Kalman filter is applied to analyze the current transient response, and the dynamics of the solenoid is estimated at each time instant. Furthermore, a new approach to estimate the varying internal solenoid reluctance, from the nonlinear model of solenoids, is proposed. The estimation is performed for each value of the current and predicted while the armature is moving. This leads to an accurate computation of the electromotive magnetic force related to the velocity of the moving actuator's component, thus permitting to know the system dynamics accurately.

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“…Due to these choices, the lift of the anchor is 85.25 μ m, and it reflects typical realistic displacements in automotive injector dynamics …”

Section: Simulation Resultsmentioning

confidence: 99%

State and parameter estimation in solenoid nonlinear equations

Pelo

Mazzia

Mininni

2017

Optim Control Appl Methods

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“…The optimization of the injection system and the design of injection control can benefit from the availability of suitable dynamic models [7], [8], [9], [10]. However, an electro-injector is a complex system, characterized by non-linear phenomena and parametric variations (due to variations of electro-mechanical parameters with working conditions) [6], [11], [12], which affect system performance if an accurate control of fuel metering is needed.…”

Section: Introductionmentioning

confidence: 99%

A dynamical model of electro-injectors for common rail diesel engines

Saponaro

Lino

Maione

2014

22nd Mediterranean Conference on Control and Automation

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Research on Common Rail (CR) injection systems has helped to increase the performance of Diesel engines in terms of available power and fuel consumption in compliance with the restrictions of noise and pollutant emissions. To accomplish these tasks, the last generation of electro-injectors is being developed to advance and improve structure and operation in achieving an accurate fuel metering. This paper presents a model of an electro-injector for common rail systems that is able to predict steady-state and transient behavior. Good results are obtained by simulation in different working conditions and match experimental data to a good extent.

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“…Concerning the second aspect, some authors [16,19] assume that the sealing between the different injector parts is perfect, and so internal leakage can be considered insignificant. And concerning the third aspect, the elastic deformation of some elements (as for instance, the needle) can be very big, even near the same order of magnitude of their displacement, because of the high pressure [16,22]. If the needle is deformed, a change in the cross-sectional area between the needle surface and the needle seat takes place, which may affect the pressure losses.…”

Section: Determination Of the Injector Pressure Lossesmentioning

confidence: 99%

Characterization of the pressure losses in a common rail diesel injector

López

Salvador

Garza

et al. 2012

Proceedings of the Institution of Mechanical Engineers, Part D:

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A methodology to characterise the pressure losses in quasi-steady conditions (i.e. at full needle lift) of common rail diesel injectors was developed. The aim was to quantify the error when experimental results of nozzle internal flow are compared with CFD results, where pressure losses are usually neglected. The proposed methodology is based mainly on experimental tests that are complemented with some approximate calculations, based on the physics of the phenomenon, to take into account the effect of the needle deformation.The results obtained in the work lead to two important conclusions: on the one hand, that it is dangerous to extrapolate results relative to the injection (internal flow, spray atomization, spray penetration..) and combustion processes from low permeability nozzles (e.g. single-hole nozzles) to high permeability nozzles (e.g. multi-hole nozzles), and, on the other hand, that the comparison of these results between experiments and CFD simulations should be carried out carefully, because the pressure losses in the injector can be high under certain conditions. Finally, people working on the study of the injection and/or combustion processes, through experiments or simulations, will find here some interesting information to better know the actual injection pressure to be used in their analysis and/or simulations.

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Accurate Modelling of an Injector for Common Rail Systems

Cited by 28 publications

References 22 publications

State and parameter estimation in solenoid nonlinear equations

State and parameter estimation in solenoid nonlinear equations

A dynamical model of electro-injectors for common rail diesel engines

Characterization of the pressure losses in a common rail diesel injector

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