Model Evaluation of the Influence of the Plunger Stroke on Functional Parameters of the Low-Pressure Pulse Gas Solenoid Injector.

Dariusz Szpica,Michał Kusznier

doi:10.3390/s21010234

Abstract

The article presents a model-based evaluation of the impact of the plunger stroke on functional parameters of the low-pressure pulse gas solenoid injector. A reduced-order physics-based mathematical model was used to achieve this goal. The model was built on the basis of specified simplifications of the process, considering the forces that cause the plunger to move and the forces constituting resistance to its displacement. The implementation of a mathematical description in to the Matlab-Simulink environment allowed one to determine the characteristic values of operation of the Valtek Rail Type-30 injector, including plunger displacement courses. Calculations made with the assumption of the factory plunger stroke confirmed the validity of the model. The differences in opening and closing times were below 3% in comparison to the values given in the objects technical information. By assuming a specific plunger stroke, the functional relationships of opening and closing times were determined. The results showed a distortion of the force–response dependence for different plunger strokes. Results presented in the article can be used to support control-oriented modeling of systems incorporating pulsed gas dosing devices, such as combustion engines or gas turbines. More specifically, the proposed method can be used to pre-calibrate the delay time of the injector operation.

Highlights

Despite the unstable situation of the oil market, interest in alternative fuels used in transport, in particular liquefied petroleum gas (LPG), continues to grow [1,2]
The ubiquitous downsizing of engines [6] raises new challenges for alternative power systems. This is compounded by modifications to the combustion process, such as Controlled Auto-Ignition (CAI)/Homogeneous Charge Compression Ignition (HCCI) [7,8], High Pressure Direct Injection (HPDI), or Reactivity Controlled Compression Ignition (RCCI) [9], which are partly met by LPG systems using petrol injectors [10]
The analysis presented in the paper aimed at estimating the opening and closing time of a variable stroke low-pressure gas injector

Summary

Introduction

Despite the unstable situation of the oil market, interest in alternative fuels used in transport, in particular liquefied petroleum gas (LPG), continues to grow [1,2]. The ubiquitous downsizing of engines [6] raises new challenges for alternative power systems. This is compounded by modifications to the combustion process, such as Controlled Auto-Ignition (CAI)/Homogeneous Charge Compression Ignition (HCCI) [7,8], High Pressure Direct Injection (HPDI), or Reactivity Controlled Compression Ignition (RCCI) [9], which are partly met by LPG systems using petrol injectors [10]. Except for the reduction of toxic emissions of exhaust components, are aimed at reducing CO2 emissions [16,17], making it increasingly attractive to use methane or petroleum-based gaseous fuels [18,19,20,21,22]

Objectives

Findings

Conclusion