Development of a simulation method for dynamic characteristics of fuel injector

Abstract

A simple and highly accurate one-dimensional simulation method is presented for simulating dynamic characteristics of a fuel injector. Magnetic aftereffect is taken into account in the method. The results confirm that the magnetic aftereffect plays an important role in the dynamic response of an injector.

Low-volume power supply for vehicular fuel injection systems

“…The required time for charging up inductors prior to a load transient, tch, can be found by (4) The time duration of 'pre_charge' mode of the OBOISO controller can be equal or greater than tch' However in order to minimize the power losses due to steered current in the pre-charged inductors, the minimum value, i.e. tch.…”

“…As illustrated, during the injection period, the converter has to deliver a specific amount of charge in a short period of time in the form of a particular output current waveform [4]. Therefore the injector power supply has to provide a pulsating power.…”

Diffusion and hysteresis in axisymmetric electromechanical devices

“…At each FP iteration, the field problems are solved for all the considered harmonic components and the solutions are reported in the time domain by an inverse fast Fourier transformation. The update of the residual , which involves the effects of nonlinear behavior, is computed in the time domain by (3). Finally, the local time varying residuals are transformed to the frequency domain and the right-hand side of (6) for the next iteration is evaluated.…”

“…Problem (1) is completed by the iterative update of the time evolution of FP residual on each element of ferromagnetic core, following the relation (3) where is the iteration number, and are the local values of magnetic flux density and residual, is the FP coefficient, and is the hysteretic characteristic of the material.…”

Development of a high-speed solenoid valve: an investigation of the importance of the armature mass on the dynamic response

“…If some effects are not significant at some times, at other times they contribute significantly. Authors like Smith-Spinweber (1980), Karidis-Turns (1982), MacBain (1985), Kushida (1985), Pawlack-Nehl (1988), Lesquesne (1990a), Yuan-Chen (1990), , Ohdachi et al (1991), Kajima (1992 and, Passarini (1993), Rahman et al (1996), Ando et al (2001), Szente-Vad (2001) and Passarini-Pinotti Jr. (2003) diverge when describing the armature movement of the of the EFI and as to which of the above mentioned phenomena should be considered and which should be neglected. It seems that most of these authors consider it sufficient to calculate precisely the magnetic force attraction, F mag to accurately define the armature movement because basically their mathematical model is described by only three forces, magnetic, elastic (Hook's law) and viscous as shown in Eq.…”