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.

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 Exploiting Bayesian networks for fault isolation: A diagnostic case study of diesel fuel injection system

2019 ◽  
Vol 86 ◽  
pp. 276-286 ◽  
Author(s):  
Jinxin Wang ◽  
Zhongwei Wang ◽  
Viacheslav Stetsyuk ◽  
Xiuzhen Ma ◽  
Fengshou Gu ◽  
...  
Keyword(s):  
Bayesian Networks ◽  
Diesel Fuel ◽  
Fuel Injection ◽  
Fault Isolation ◽  
Injection System ◽  
Fuel Injection System ◽  
Diesel Fuel Injection

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).

A Procedure for Upgrading an Electronic Control Diesel Fuel Injection System by Considering Several Engine Operating Regimes Simultaneously

1999 ◽  
Vol 121 (1) ◽  
pp. 159-165 ◽  
Author(s):  
B. Kegl
Keyword(s):  
Diesel Fuel ◽  
Fuel Injection ◽  
Injection System ◽  
Fuel Injection System ◽  
Electronic Control ◽  
Control Parameters ◽  
Design Variables ◽  
Cam Profile ◽  
Diesel Fuel Injection ◽  
Operating Regimes

This paper describes an optimal design procedure for improving the injection rate histories of an electronic control diesel fuel injection system (ECD-FIS) with sleeve-timing-controlled pump. The research objective was to develop an approach for upgrading an existing ECD-FIS by performing only some low-cost modifications on its design. Therefore, the design variables are related to a relative small number of geometrical and control parameters of the injection system. The geometrical parameters influence only the shape of a rational Be´zier curve, representing the cam profile of the pump. The control parameters influence the injection timing and injection quantity. These control parameters are introduced into the set of design variables in order to enable good results over the whole engine operating regime. The design problem is formulated in a form of a non-linear problem of mathematical programming. Several operating regimes are simultaneously taken into account by an appropriate objective function while some geometrical properties of the cam profile as well as some injection parameters are kept within acceptable limits by the imposed constraints. The theory is illustrated with a numerical example.

Two-phase flow of liquid-gas in diesel fuel injection system and their effect on engine performances

2001 ◽  
Vol 10 (3) ◽  
pp. 223-227 ◽  
Author(s):  
Yongling He ◽  
Zhihe Zhao ◽  
Jianxin Liu ◽  
Huiyong Du ◽  
Min Li ◽  
...  
Keyword(s):  
Diesel Fuel ◽  
Fuel Injection ◽  
Two Phase Flow ◽  
Injection System ◽  
Fuel Injection System ◽  
Phase Flow ◽  
Two Phase ◽  
Diesel Fuel Injection
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