scholarly journals DIAGNOSTICS OF DIESEL ENGINE REFRIGERATION ELEMENTS AND WAYS OF INCREASING TECHNICAL AND ECONOMIC INDICATORS

2021 ◽  
pp. 35-44
Author(s):  
Svetlana Kravets
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Fuel Efficiency ◽  
Operating Mode ◽  
Technical Condition ◽  
Production Costs ◽  
Fuel Supply ◽  
Stage Of Development ◽  
Material Costs ◽  
Wide Range

The reliability of automotive equipment is its ability to perform constructively laid down functions without additional labor and material costs to maintain an able-bodied condition for a long time. Due to the fact that the quality of automotive equipment is characterized by its reliability and performance, increasing the level of reliability is an urgent task at the present stage of development of the technical operation of agricultural equipment. In addition, increasing the reliability of automotive vehicles is a promising way to reduce production costs, since the operation of more reliable equipment requires less labor and material costs. In the restored FS, the stabilization of the initial parameters during operation depends on many technological factors. The main reasons are those that greatly affect the reliability and have a wide range of characteristics under repair conditions. Changes in the technical condition of diesel engines during operation have a great impact on the indicators of fuel efficiency and toxicity of exhaust gases, with the former accounting for half of the resource consumption in agriculture. In order to achieve the necessary environmental and economic performance indicators of an autotractor diesel engine, its characteristics and fuel supply parameters should be adjusted in accordance with the operation and operating mode of the engine. Such a solution will make it possible to change the required parameters and characteristics, thereby ensuring the required nature of the flow of such fuel supply processes as spraying, mixture formation and combustion in each mode of operation. For efficient fuel injection into a diesel cylinder, it is necessary to have a significant reserve of fuel pump performance. Accordingly, a decrease in productivity can lead to a decrease in the amount of cycle feed. Based on the determination of the fuel consumption in the low pressure line of the system, the following tasks can be solved: - assess the technical condition of the fuel system in operation; - to optimize the balance of fuel supply in the experimental FS of the accumulating type and thereby reduce the power consumption for the operation of the system.

Transient Turbulent Gaseous Fuel Jets for Diesel Engines

1999 ◽  
Vol 121 (1) ◽  
pp. 93-101 ◽  
Author(s):  
Philip G. Hill ◽  
Patric Ouellette
Keyword(s):  
Diesel Engine ◽  
Small Angle ◽  
Compressible Flows ◽  
Fuel Injection ◽  
Gaseous Fuel ◽  
Jet Injection ◽  
Penetration Distance ◽  
Wide Range ◽  
Jet Penetration ◽  
Species Diffusion

Existing data on transient turbulent jet injection in to large chambers demonstrates self-similar behavior under a wide range of conditions including compressibility, thermal and species diffusion, and nozzle under expansion. The Jet penetration distance well downstream of the virtual origin is proportional to the square root of the time and the fourth root of the ratio of nozzle exit momentum flow rate to chamber density. The constant of proportionality has been evaluated by invoking the concept of Turner that the flow can be modeled as a steady jet headed by a spherical vortex. Using incompressible transient jet observations to determine the asymptotically constant ratio of maximum jet width to penetration distance, and the steady jet entrainment results of Ricou and Spalding, it is shown that the penetration constant is 3 ± 0.1. This value is shown to hold for compressible flows also, with substantial thermal and species diffusion, and even with transient jets from highly under-expanded in which, as in diesel engine chambers with gaseous fuel injection, the jet is directed at a small angle to one wall of the chamber. In these tests, with under expanded nozzles. Observations of transient jet injection have been made in a chamber in which, as in diesel engine chambers with gaseous fuel injection, the jet is directed at a small angle to one wall of the chamber. In these tests, with under-expanded nozzles it was found that at high nozzle pressure ratios, depending on the jet injection angle, the jet penetration can be consistent with a penetration constant of 3. At low pressure ratios the presence of the wall noticeably retards the penetration of the jet.

Modelling of Spray–Swirl Interaction in Direct Injection Diesel Engine Combustion Chambers

1985 ◽  
Vol 199 (3) ◽  
pp. 187-198 ◽  
Author(s):  
P S Mehta ◽  
A K Gupta
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Direct Injection ◽  
Three Dimensional ◽  
Combustion Chambers ◽  
Direct Injection Diesel Engine ◽  
Wide Range ◽  
Engine Combustion ◽  
Computation Scheme ◽  
Good Agreement

A mathematical model for predicting spray–swirl interaction in a direct injection diesel engine combustion chamber is developed using centre-line velocity vector/continuum approach. The model has three-dimensional features in fuel spray motion. The present model responds to the various air swirl, fuel injection and cylinder charge conditions. The predicted results are compared with the analytical and experimental data available from various sources in the two-dimensional case. Very good agreement is achieved over a wide range of data. The three-dimensional predictions are directly possible without any alteration in the computation scheme.

Simulation Model of Four Stroke, Six Cylinder Marine Diesel Engine

2015 ◽  
Vol 236 ◽  
pp. 113-118
Author(s):  
Marcin Kluczyk ◽  
Andrzej Grządziela
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Technical Condition ◽  
Operational Experience ◽  
Fuel System ◽  
Engine Operation ◽  
Injection Pump ◽  
Fuel Injection Pump ◽  
Marine Diesel ◽  
Basic Equations

The paper presents a model of dynamics of six-cylinder inline diesel engine executed in the Matlab software. The basic equations necessary to describe the forces acting during the engine operation was presented. Application of some simplifications allowed to present proposal of a mathematical model of the engine, which allows analysis of changes of forces in the crank-piston system, depending on the technical condition of the fuel system elements. Operational experience indicate that one of the most common cause of failure of the fuel system is reduced fuel charge supplied by a defective fuel injection pump. Calculations of gas forces had been replaced by the implementation into the model indication charts recorded from tests on a engine test stand. Simulation results were presented as a result of FFT spectra of modeled tangential forces.

Paper 2: Similarity Considerations in Assessing Diesel Engine Fuel Spray Requirements

1965 ◽  
Vol 180 (14) ◽  
pp. 10-29 ◽  
Author(s):  
B. E. Knight
Keyword(s):  
Diesel Engine ◽  
Fuel Injection ◽  
Engine Performance ◽  
Fuel Spray ◽  
Theoretical Expression ◽  
Engine Fuel ◽  
Wide Range ◽  
Air Mixing ◽  
Dimensionless Variables ◽  
Mixing Problem

A simplified dimensional analysis has been made of the fuel-air mixing problem in diesel engines. The dimensionless variables describing the mixing pattern have been expressed in terms of the dimensionless variables describing the engine and fuel injection conditions by means of explicit equations with numerical values for the constants. A wide range of such equations has been derived and tables of numerical values are given as examples, together with examples of engine air motion calculations for comparison. A theoretical expression for fuel-spray penetration into a cross-wind has been compared with a few experimental results. Engine smoke and specific consumption measurements have been plotted against the appropriate dimensionless variables in two instances. In both instances the response of the engine to the variables is quite different. It is believed that the wide range of methods of engine performance data analysis outlined in this paper will make a significant contribution to progress in understanding diesel engine combustion.

Design and Development of Double Helix Fuel Injection Pump for Four Stroke V-16 Rail Traction Diesel Engine

2007 ◽  
Author(s):  
A. K. Kathpal ◽  
Anirudh Gautam ◽  
Avinash Kumar Agarwal ◽  
R. Baskaran
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Fuel Injection ◽  
Double Helix ◽  
Fuel Efficiency ◽  
Injection System ◽  
Injection Timing ◽  
Fuel Injection System ◽  
Injection Pump ◽  
Fuel Injection Pump

The diesel fuel-injection system of ALCO DLW 251 engine consists of single cylinder injection pumps, delivery pipes, and fuel injector nozzles. Fuel injection into the combustion chamber through multi-hole nozzles delivers designed power and fuel efficiency. The two most important variables in a fuel injection system of a diesel engine are the injection pressure and injection timing. Proper timing of the injection process is essential for satisfactory diesel engine operation and performance. Injection timing needs to be optimised for an engine based on requirements of power, fuel economy, mechanical and thermal loading limitations, smoke and emissions etc. Since each of these requirements varies with the operating conditions, sometimes contrary to the requirements of the other parameters, the map of optimised injection timing can be very complex. The ALCO DLW 251 engine’s fuel injection pump is jerk type to permit accurate metering and timing of the fuel injected. The pump has a ported barrel and constant-stroke plunger incorporating a bottom helix for fuel delivery control with constant injection timing. From the point of view of good power and fuel economy, combustion should take place so that the peak firing pressure occurs at about 10–15° after TDC and is usually a few degrees after combustion starts. For this to happen, fuel should be injected at an appropriate time, depending on Injection delay and Ignition delay. Both these factors are dependent on the speed and load. Changing the operating point of the engine may change either one or both types of delay, altering the moment of start of combustion. Various researchers have shown that both the Injection and the Ignition delay are reduced as the engine speed is decreased resulting in advancement of injection timing at lower speeds (and loads). This condition will be corrected by varying the static injection timing, which can be achieved by providing a modified helix on the plunger to delay the start of fuel injection, for the lower speeds and loads. A new double helix (upper and lower helix) fuel injection pump for the ALCO DLW 251 16 V engine has been designed. The new fuel injection pump has been tested on the engine test cell at Research Designs & Standards Organisation and has shown an improvement of 1.2% in locomotive duty cycle fuel consumption. This paper describes the design & development of double helix fuel injection pump and discusses the engine tests completed to verify the projected improvements in fuel efficiency.

scholarly journals Research On Fuel Compensation Control of High-pressure Common-Rail Diesel Engine Based On Crankshaft Segment Signals

2021 ◽  
Author(s):  
Yuhua Wang ◽  
Guiyong Wang ◽  
Guozhong Yao ◽  
Lizhong Shen ◽  
Shuchao He
Keyword(s):  
High Pressure ◽  
Diesel Engine ◽  
Fuel Injection ◽  
Common Rail ◽  
Engine Fuel ◽  
Quantization Method ◽  
Software Module ◽  
Fuel Supply ◽  
Compensation Control ◽  
High Pressure Common Rail

Abstract This paper studies the high-pressure common-rail diesel engine fuel supply compensation based on crankshaft fragment signals in order to improve the uneven phenomenon of diesel engine fuel supply and realize high efficiency and low pollution combustion. The experiments were conducted on a diesel engine with the model of YN30CR. Based on the characteristics of crankshaft fragment signals, the proportional integral (PI) control algorithm was used to quantify the engine working nonuniformity and extract the missing degree of fuel injection. The quantization method of each cylinder working uniformity and algorithm of fuel compensation control (FOC) based on crankshaft fragment signal were established, and the control strategy of working uniformity at different operating conditions was put forward. According to the principle of FOC control, a FOC control software module for ECU was designed. The FOC software module was simulated on ASCET platform. The results show that: Compared with the traditional quantization method, the oil compensation information extracted from crankshaft fragment signal has stronger anti-interference and more accurate parameters. FOC algorithm can accurately reflect the engine's working nonuniformity, and the control of the nonuniformity is reasonable. The compensation fuel amount calculated by FOC is high consistency with the fuel supply state of each cylinder set by experiment, which meets the requirement of accurate fuel injection control of common-rail diesel engine.

JUSTIFYING THE FUEL SUPPLY IN THE COMMON RAIL SYSTEM WHEN DIAGNOSING THE VEHICLE ENGINE

2021 ◽  
Vol 2 (143) ◽  
pp. 12-20
Author(s):  
Dmitriy A. Galin ◽  
◽  
Nikolay V. Rakov ◽  
Aleksandr M. Davydkin ◽  
Leonid O. Krush
Keyword(s):  
Fuel Injection ◽  
Control Unit ◽  
Technical Condition ◽  
Common Rail ◽  
Research Purpose ◽  
Training Procedure ◽  
Common Rail System ◽  
Fuel Supply ◽  
Rail System ◽  
The Common

Analysis of technical condition of diesels with accumulator Common Rail power supply system shows that the largest share of fuel equipment failures is associated with malfunction of high-pressure fuel injectors. The electronic engine control unit generates commands for biphasic fuel injection from each injector. Due to the wear of the injector elements, there is an uneven fuel supply to the engine cylinders and, as a rule, deterioration of its operation. (Research purpose) The research purpose is in studying the process of adjusting the fuel supply in the Common Rail system when diagnosing the engine of a Ford Transit vehicle. (Materials and methods) The most relevant method of commissioning Common Rail fuel system injectors are various service procedures, such as the Low Injection Training procedure. Authors used a scanner and appropriate software to estimate total fuel delivery at idle mode. Authors performed the study on a 2.4 liter Duratorq diesel engine. (Results and discussion) The article presents the engine parameters before and after adjustment (Small Injection Procedure). Before adjustment, two cylinders of the engine received more fuel than the other cylinders. It manifests in an increase in crankshaft speed. After the adjustment, the fuel supply to the cylinders was equalized, resulting in an equalization of crankshaft RPM, reduced vibration and noise. (Conclusions) The study showed that fuel adjustment and Low Injection Training should be a must for engine diagnostics. Correction is effective if the value of injection discrepancy is no more than 5 mg/stroke.

scholarly journals RESEARCH OF RESIDUAL LIFETIME OF DIESEL ENGINES FUEL INJECTION EQUIPMENT BY MEANS OF FUEL INJECTION MATHEMATIC SIMULATION

2020 ◽  
pp. 33-47
Author(s):  
Vasyl Muzychuk ◽  
Vitaliy Komaha ◽  
Oleksii Tokarchuk ◽  
Oleksandr Kukharchuk
Keyword(s):  
Diesel Engines ◽  
Fuel Injection ◽  
Extreme Values ◽  
Technical Condition ◽  
Theoretical Research ◽  
Residual Lifetime ◽  
Injection Equipment ◽  
Small Deviations ◽  
Fuel Supply ◽  
Influence Coefficients

On the basis of the engineering practices of the last 3-4 decades, it is known, tested and proven that, while mathematical models provide reliable descriptions of processes, cycles or physical phenomena, in theoretical research the theory of small deviations is comprehensively preferable to any experiment on regulating characteristics. Considering the fact that all parameters and characteristics are sometimes interconnected by nonlinear dependences, it is impossible to distinguish the influence of a specific parameter on the sought-for value, and can be even hazardous if the determinant argument or its derivative has extreme values. The role of mathematic simulation to determine the residual lifetime of the fuel injection equipment of diesel engines was established. It was also noted that for a reliable description of the processes going on in the fuel injection equipment it is advisable to use the method of small deviations. The mathematical model is based on the known physical laws that describe the interdependence of the two groups of parameters: engine variables and performance parameters - both within the groups and between them. The transition of classical differential equations describing the processes of fuel supply and injection taking into account fuel leaks in precision pairs to the equations with small deviations of parameters is shown. An analysis of correlations between the parameters of injection, fuel supply and fuel leakage was carried out and the most influential parameters were found. The influence coefficients are found and correlations between the influence coefficients and the corresponding parameters are constructed. We used the correlations found to describe the influence of the technical condition of precision pairs on the engine performance indicators. The correlations between the change in injection patterns and small deviations of the parameters describing technical condition of precision pairs are also established.

scholarly journals Using Simulation for Development of The Systems of Automobile Gas Diesel Engine and its Operation Control

2018 ◽  
Vol 7 (2.28) ◽  
pp. 288 ◽  
Author(s):  
Mikhail G. Shatrov ◽  
Vladimir V. Sinyavski ◽  
Andrey Yu. Dunin ◽  
Ivan G. Shishlov ◽  
Andrey V. Vakulenko ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Diesel Engines ◽  
Fuel Efficiency ◽  
Fuel Supply ◽  
High Fuel Efficiency ◽  
Fuel Substitution ◽  
Basic Parameters ◽  
Cr System ◽  
And Control

The work was aimed at the development of gas supply, diesel fuel supply and electronic control systems for automobile gas diesel engines. Different ways of diesel engine conversion to operate on natural gas were analyzed. Gas diesel process with minimized ignition portion of diesel fuel injected by the CR system was selected. Electronic engine control and modular gas feed systems which can be used on high- and middle-speed gas diesel engines were developed. Diesel CR fuel supply system was developed in cooperation with the industrial partner. Simulation was used to obtain basic parameters and control methods of these systems. The base diesel engine was converted into gas diesel engine using the systems developed. Bench tests of the gas diesel engine demonstrated a high share of diesel fuel substitution with gas, high fuel efficiency and large decrease of NOх and СО2 emissions. 

scholarly journals Formation of Static Characteristics of a Diesel Engine

2020 ◽  
pp. 43-50
Author(s):  
A.G. Kuznetsov ◽  
S.V. Kharitonov
Keyword(s):  
Diesel Engine ◽  
Power Plants ◽  
Guide Vane ◽  
Fuel Efficiency ◽  
Maximum Pressure ◽  
Variable Geometry ◽  
Static Characteristics ◽  
Fuel Supply ◽  
Air Supply ◽  
Variable Geometry Turbine

The introduction of modern diesel fuel supply systems and the use of electronic components in control systems provide new possibilities for shaping engine characteristics targeted at specific energy consumers. Under these conditions, the type of engine characteristics is determined by the operation of the air supply system. This work examines the formation of static characteristics for a promising D500 diesel engine for train and ship power plants. Modeling of the diesel operation modes is carried out on computer models in the MATLAB/Simulink and Diesel-RK software packages. Variants of the full-load curves of the diesel engine are presented for different ways of turbocharger control: using a turbine of variable geometry and with sequential turbocharging. The fuel supply is limited according to the air-fuel ratio and the maximum pressure in the engine cylinders. For a variable geometry turbine, a matrix of the positions of the guide vane blades is obtained from the condition of optimizing diesel modes for fuel efficiency. Possibilities to obtain the efficiency characteristic that would provide the minimal fuel consumption for train and ship power plants are shown.

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