scholarly journals Dynamic characteristics of the nozzle opening pressure based on the fluid–structure interaction for a double-solenoid-valve fuel injection system

2016 ◽  
Vol 231 (11) ◽  
pp. 1589-1602 ◽  
Author(s):  
Xiaodong An ◽  
Xinghua Liu ◽  
Baigang Sun
Keyword(s):  
Fuel Injection ◽  
Solenoid Valve ◽  
Injection System ◽  
Fuel Injection System ◽  
Opening Pressure ◽  
Structure Interaction ◽  
Piston Pair ◽  
Initial Fuel ◽  
Nozzle Opening Pressure ◽  
Nozzle Opening

The nozzle opening pressure of fuel injection systems affects the initial fuel atomization, the fuel injection quantity, the emission characteristics and the operation stability of diesel engines. This paper presents an investigation on the dynamic characteristics of the nozzle opening pressure for a double-solenoid-valve fuel injection system. A numerical model for the nozzle opening pressure based on the fluid–structure interaction theory is established, including the models for the physical properties of the fuel, the leakage rate of the piston pair and the elastic deformation of the piston chamber and the piston pair. Also, experiments were carried out to validate the proposed model. Good agreement was found between the simulated results and the measured results. Based on this model, the effects of some factors on the nozzle opening pressure are analysed. The results show that the rotational speed of the cam, the initial clearance of the piston pair and the sealing length of the piston pair have slight effects on the nozzle opening pressure but that the diameter of the piston, the initial fuel temperature and the residual volume greatly influence the nozzle opening pressure.

Experimental investigation of dwell time characteristics in high-pressure double-solenoid-valve fuel injection system

2019 ◽  
Vol 233 (13) ◽  
pp. 3281-3292
Author(s):  
Dan Xu ◽  
Qing Yang ◽  
Xiaodong An ◽  
Baigang Sun ◽  
Dongwei Wu ◽  
...  
Keyword(s):  
Fuel Injection ◽  
Injection Pressure ◽  
Solenoid Valve ◽  
Injection System ◽  
Fuel Injection System ◽  
Pilot Injection ◽  
Main Injection ◽  
Injection Interval ◽  
The Difference ◽  
Variation Rule

The double-solenoid-valve fuel injection system consists of an electronic unit pump and an electronic injector. It can realize the separate control of fuel supply and injection and has the advantages of adjusting pressure by cycle and flexible controlling of the injection rate. The interval angle between the pilot and main injection directly affects the action degree and the characteristics of two adjacent injections, affecting engine performance. This work realizes multiple injection processes on the test platform of a high-pressure double-solenoid-valve fuel injection system, with maximum injection pressure reaching 200 MPa. In this study, the interval between driven current signal of pilot injection termination and that of main injection initiation is defined as the signal interval (DT1), whereas the interval between pilot injection termination and main injection initiation is defined as the injection interval (DT2). The differences between the signal and the injection intervals are calculated, and the variation rule of the difference with respect to the signal interval is analyzed. Results show that the variation rule of the difference with the signal interval first decreases, then increases, and finally decreases. The variation rule of the delay angle from the start of needle movement to the start of fuel injection is found to be the root cause of this rule. The influence of the injection pressure on needle deformation and fuel flow rate of the nozzle results in the variation rule. In addition, the influence of the cam speed, temperature, and pipe length on the difference between the signal and injection interval is determined. This research provides guidance for an optimal control strategy of the fuel injection process.

Effects on Locomotive Diesel Engine Performance by Selecting Solenoid Valve Parameters

2011 ◽  
Vol 467-469 ◽  
pp. 140-145
Author(s):  
Ming Hai Li ◽  
Feng Jiang
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Engine Performance ◽  
Solenoid Valve ◽  
Optimal Combination ◽  
Injection System ◽  
Fuel Injection System ◽  
Drive Current ◽  
Experimental Values ◽  
Locomotive Diesel

Solenoid valve is the key component to determine the performance of electronic fuel injection system for the diesel engine. By theoretically analyzing the characteristics of solenoid valve driver, we found out that one of the factors that affect the closing and opening speed of solenoid valve is drive current. In this paper, GT-Flow software is used to simulate and analyze the drive current, and come to the optimal combination of current. The selected drive current is used to analyze the emission performance of 16V265H diesel engine, to determine the best advance angle for fuel supply, and to compare the simulation results with the experimental values.

Design of Intelligent Driving Module for High Pressure Common Rail

2013 ◽  
Vol 344 ◽  
pp. 182-185 ◽  
Author(s):  
Yong Zhi Zhang ◽  
Zhe Zuo ◽  
Bo Lan Liu
Keyword(s):  
High Pressure ◽  
Fuel Injection ◽  
Solenoid Valve ◽  
Common Rail ◽  
Experimental Results ◽  
Injection System ◽  
Fuel Injection System ◽  
Peak Current ◽  
Driving Circuit ◽  
High Pressure Common Rail

This paper proposed a kind of intelligent driving module based on the requirements of high pressure common rail fuel injection system. Many functions of this module were designed such as current multiply holding , boosting and energy recovering. This module occupies less microcontroller resources and makes injectors solenoid valve pull more smoothly. The experimental results show that the solenoid valves peak current can achieve to 20A within 0.1 ms and the storage capacitys potential was not changed significantly. This intelligent driving module could achieve the requirements of high pressure common rail driving circuit.

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