An Experimental Characterization for Injection Quantity of a High-pressure Injector in GDI Engines

Wen-Chang Tsai,Tung-Sheng Zhan

doi:10.3390/jlpea8040036

Wen-Chang Tsai, Tung-Sheng Zhan

Open Access

https://doi.org/10.3390/jlpea8040036

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Abstract

The high-pressure (HP) injector is a highly dynamic component requiring careful voltage and pressure input modulation to achieve the required fuel injection quantities of gasoline direct injection (GDI) engines. Accurate fuel injection curves are a key influence for this technology, and therefore, will require an accurate estimation of fuel flow rate to be realized. In order to be driven to rapid response with respect to solenoid valve coils, HP injectors typically require to be designed to be capable of rapid response in GDI engines. In this paper, the design and analysis of the proposed injector drive circuit are presented. Next, the effects of total pulse width, injector supply voltage, fuel system pressure, and pulse width modulation (PWM) operation on fuel injection quantities of an HP injector are measured for achieving robust performance and stability in the presence of bounded errors of the GDI injectors due to total pulse width, injector’s supply voltage, fuel pressure and PWM operation. Additionally, the fuel injection quantities of the HP injector are measured by tuning the parameters of the injector drive circuit with the PWM operation. These are defined as the fuel injection curves. Finally, experimental results are provided for verification of the proposed injector drive circuit.

Highlights

Many advanced solenoid fuel injection techniques have been developed to be implemented in various investigations of gasoline direct injection (GDI) engines [1]
The supply voltage was adjusted to range from DC 40 V to 70 V and fed the GDI injector actuator to investigate the effects of the injector supply voltage on the fuel injection quantities
pulse width modulation (PWM) control was added to the power metal oxide semiconductor field effect transistors (MOSFETs) drive circuit to quickly turn off the injection of HP fuel injectors

Summary

Introduction

Many advanced solenoid fuel injection techniques have been developed to be implemented in various investigations of gasoline direct injection (GDI) engines [1]. Accurate injection control with rapid response will have some benefit of reducing fuel injector deposits and reducing particulate emissions from GDI engines [2,3]. Two-stage current shapes were conducted into the analysis of the performance of the drive circuits and were found to be the optimal power strategy for driving the fuel injector under different supply pressures [8]. The electrical drive circuit for the high-pressure GDI injector was developed for a 500 c.c. motorbike engine [10]. The experimental data of the HP fuel injection system was investigated by various electrical drive circuit designs proposed for the HP injector [12,13,14,15]

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Results

Conclusion