Numerical Modeling and Simulation of Pressure Wave in Combination Electronic Unit Pump High Pressure Pipeline

2013 ◽  
Vol 805-806 ◽  
pp. 1823-1826 ◽  
Author(s):  
Hayat Qaisar ◽  
Li Yun Fan ◽  
Bing Qi Tian ◽  
Zhen Ma Xiu
Keyword(s):  
High Pressure ◽  
Numerical Model ◽  
Pressure Wave ◽  
Fuel Injection ◽  
Operating Conditions ◽  
Injection System ◽  
Fuel Injection System ◽  
Electronic Unit ◽  
Electronic Unit Pump ◽  
High Pressure Pipeline

High pressure (HP) fuel pipeline is one of the major components of Combination Electronic Unit Pump (CEUP) diesel fuel injection system and has significant contribution in building up of high pressure required during fuel injection cycle. A MATLAB numerical model of pressure wave inside HP fuel pipeline of CEUP system using damped wave equation has been developed in MATLAB to study and simulate pressure wave propagation through fuel pipeline at various operating conditions of diesel engine. Finite Difference method has been applied to model and simulate pressure equation at various equidistant locations of fuel pipeline. Dynamic variations of fuel properties as a function of varying pressure have also been incorporated. The MATLAB model has been validated by comparing simulated pressures with those of experimentally validated AMESim numerical model of CEUP fuel injection system. Quantitative comparisons were also done using Root Mean Square Error (RMSE) and Index of Agreement (IA). Results show that MATLAB numerical model is quite accurate especially at low cam rotational speeds and low cam angles.

Development of cavitation and enhanced injector models for diesel fuel injection system simulation

2002 ◽  
Vol 216 (7) ◽  
pp. 607-618 ◽  
Author(s):  
H-K Lee ◽  
M F Russell ◽  
C S Bae ◽  
H D Shin
Keyword(s):  
High Pressure ◽  
Bulk Modulus ◽  
Diesel Fuel ◽  
Fuel Injection ◽  
Operating Conditions ◽  
Injection System ◽  
Fuel Injection System ◽  
Non Linear ◽  
Diesel Fuel Injection ◽  
Injection Pressures

To expedite the application of fuel injection equipment to diesel engines, powertrain engineers are simulating the rate of injection with computer models. Many of the simple models give quite substantial errors if fuel cavitation in the high pressure system and the variations in bulk modulus with temperature and pressure are not included. This paper discuses cavitation and a companion paper discusses the treatment of non-linear bulk modulus. Diesel fuel injection nozzle hole size has been reduced and the injection pressures have been raised, to improve combustion, and the termination of the injection has been accelerated, to reduce carbon particle mass in the exhaust. High injection pressures and rapid termination set up very large hydraulic waves in the pipes and drillings of the fuel injection system, be it pump-pipe-nozzle or accumulator/common rail in type. The fuel momentum generated in these vigorous wave actions leaves such low pressures in parts of the system that vapour bubbles form in the fuel. Cavitation changes the bulk modulus of the fuel and the collapse of the cavities imparts sudden high pressure pulses to the fuel columns in the system and changes injection characteristics significantly. When modelling devices to control injection rate, the cavitation and non-linear bulk modulus have to be incorporated into the model. To this end, the concept of ‘condensation’ has been useful. The cavitated pipe section is divided into liquid and liquid + vapour mixture columns and modified momentum and mass conservation equations are applied separately. The model has been validated with a particular application of a rotary distributor pump to a high speed direct injection diesel engine, which is one of the more difficult fuel injection systems to model in which cavitation occurs at several operating conditions. The simulation results show the cavitation characteristics very well. This cavitated flow calculation model may be applied to other one-dimensional flow systems In addition, a more comprehensive injector model is introduced, which considers two loss factors at the needle seat and holes, sac volume, and viscous drag and leakage. This enhanced injector model shows some improvement at low load conditions

scholarly journals FPGA Based Engine Control Module for Fuel Injection System

2019 ◽  
Vol 8 (10) ◽  
pp. 3888-3892
Keyword(s):  
Fuel Injection ◽  
Design Tool ◽  
Operating Conditions ◽  
Injection System ◽  
Fuel Injection System ◽  
Engine Control ◽  
Computationally Efficient ◽  
Control Module ◽  
Fuel Prices ◽  
Ecm Architecture

Fuel injection system is an indispensible part of the present day automobiles. The depletion of the fuels along with continuous surge in the fuel prices has made it imperative to use fuel economically and restricting the wastage to a minimum. Contrary to the carburetor, using predefined amount of fuel irrespective of the environment, Fuel Injection System uses just the required amount of fuel based on the operating conditions as sensed by the Engine Control Module (ECM). Numerous parameters are required to be sensed by the ECM to achieve optimum efficiency of the engine. To handle the processing of such large number of parameters, a robust architecture is required. This paper presents the design and implementation of ECM utilized in Electronic Fuel Injection (EFI) system on a Field Programmable Gate Array. The ECM architecture discussed in the proposed system is computationally efficient enough to fulfill ever-increasing functionalities of the ECM. The main objective of this research is to sense the parameters required for the ECM analysis and to interpret and analyze this data and accordingly control the solenoid (actuator). The CAN controller is also deployed in an FPGA to facilitate the communication between ECM and Human Machine Interface (HMI) to indicate the parameters sensed by the sensor on the LCD. The target device (FPGA) for this work is Xilinx Spartan 3E and the design tool is Xilinx ISE 14.7 with the ECM and CAN controller being modeled in Verilog Hardware Description Language (HDL).

scholarly journals Nonlinear Modeling and Analysis of Pressure Wave inside CEUP Fuel Pipeline

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Qaisar Hayat ◽  
Liyun Fan ◽  
Enzhe Song ◽  
Xiuzhen Ma ◽  
Bingqi Tian ◽  
...  
Keyword(s):  
Wave Equation ◽  
Pressure Wave ◽  
Fuel Injection ◽  
Nonlinear Modeling ◽  
Operating Conditions ◽  
Fuel Properties ◽  
Injection System ◽  
Modeling And Analysis ◽  
Large Pressure ◽  
Realistic Description

Operating conditions dependent large pressure variations are one of the working characteristics of combination electronic unit pump (CEUP) fuel injection system for diesel engines. We propose a precise and accurate nonlinear numerical model of pressure inside HP fuel pipeline of CEUP using wave equation (WE) including both viscous and frequency dependent frictions. We have proved that developed hyperbolic approximation gives more realistic description of pressure wave as compared to classical viscous damped wave equation. Frictional effects of various frequencies on pressure wave have been averaged out across valid frequencies to represent the combined effect of all frequencies on pressure wave. Dynamic variations of key fuel properties including density, acoustic wave speed, and bulk modulus with varying pressures have also been incorporated. Based on developed model we present analysis on effect of fuel pipeline length on pressure wave propagation and variation of key fuel properties with both conventional diesel and alternate fuel rapeseed methyl ester (RME) for CEUP pipeline.

Modeling and Control of a High Pressure Combined Air/Fuel Injection System

2009 ◽  
Author(s):  
Chao Yong ◽  
Eric J. Barth
Keyword(s):  
High Pressure ◽  
Fuel Injection ◽  
Lumped Parameter Model ◽  
Injection System ◽  
Fuel Injection System ◽  
Modeling And Control ◽  
Lumped Parameter ◽  
Mass Flow Rates ◽  
And Control ◽  
Liquid Piston

A high pressure combined air-fuel injection system is designed and tested for an experimental free liquid-piston engine compressor. The application discussed utilizes available high pressure air from the compressor’s reservoir, and high pressure fuel to mix and then inject into a combustion chamber. This paper addresses the modeling, design and control for this particular high-pressure air-fuel injection system, which features an electronically controlled air/fuel ratio control scheme. This system consists of a fuel line and an air line, whose mass flow rates are restricted by metering valves. These two lines are connected to a common downstream tube where air and fuel are mixed. By controlling the upstream pressures and the orifice areas of the metering valves, desired A/F ratios can be achieved. The effectiveness of the proposed system is demonstrated by a lumped-parameter model in simulation and validated by experiments.

scholarly journals Coal-Water Slurry Spray Characteristics of a Positive Displacement Fuel Injection System

1992 ◽  
Vol 114 (3) ◽  
pp. 528-533 ◽  
Author(s):  
A. K. Seshadri ◽  
J. A. Caton ◽  
K. D. Kihm
Keyword(s):  
Diesel Fuel ◽  
Fuel Injection ◽  
Cone Angle ◽  
Operating Conditions ◽  
Injection System ◽  
Fuel Injection System ◽  
Water Slurry ◽  
Positive Displacement ◽  
Coal Water Slurry ◽  
Break Up

Experiments have been completed to characterize coal-water slurry sprays from a modified positive displacement fuel injection system of a diesel engine. The injection system includes an injection jerk pump driven by an electric motor, a specially designed diaphragm to separate the abrasive coal from the pump, and a single-hole fuel nozzle. The sprays were injected into a pressurized chamber equipped with windows. High speed movies and instantaneous fuel line pressures were obtained. For injection pressures of order 30 MPa or higher, the sprays were similar for coal-water slurry, diesel fuel, and water. The time until the center core of the spray broke up (break-up time) was determined both from the movies and from a model using the fuel line pressures. Results from these two independent procedures were in good agreement. For the base conditions, the break-up time was 0.58 and 0.50 ms for coal-water slurry and diesel fuel, respectively. The break-up times increased with increasing nozzle orifice size and with decreasing chamber density. The break-up time was not a function of coal loading for coal loadings up to 53 percent. Cone angles of the sprays were dependent on the operating conditions and fluid, as well as on the time and location of the measurement. For one set of cases studied, the time-averaged cone angle was 15.9 and 16.3 deg for coal-water slurry and diesel fuel, respectively.

Analysis of Pressure Wave Model Predictions Considering Diesel Fuel Properties

2014 ◽  
Vol 681 ◽  
pp. 7-10
Author(s):  
Hayat Qaisar ◽  
Li Yun Fan ◽  
En Zhe Song ◽  
Xiu Zhen Ma ◽  
Bing Qi Tian ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Numerical Model ◽  
Diesel Fuel ◽  
Pressure Wave ◽  
Fuel Injection ◽  
Operating Conditions ◽  
Fuel Properties ◽  
Empirical Formulas ◽  
Dynamic Variations ◽  
Mean Square Errors

Diesel fuel pressure wave inside Combination Electronic Unit Pump (CEUP) pipeline has been investigated using a 1D viscous damped mathematical model considering the effect of four key fuel properties including density, viscosity, acoustic wave speed and bulk modulus. Wave equation (WE) based mathematical model has been developed in MATLAB using finite difference method. Mathematical model results at various operating conditions of diesel engine have been verified by comparing with those of AMESim numerical model of CEUP and quantified through Root Mean Square Errors (RMSE) and Index of Agreements (IA). Dynamic variations of these fuel properties during fuel injection cycles have also been incorporated in mathematical model by utilizing empirical formulas. Predicted results show that simulated results which consider fuel properties dynamic variations as a function of pressure are more coherent to AMESim numerical model results.

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