scholarly journals DIAGNOSIS OF FUEL EQUIPMENT OF DIESEL ENGINE BY REMOVING VYBRO INDICATORS OF FUEL SUPPLY

2021 ◽  
pp. 113-123
Author(s):  
Serhiy Burlaka ◽  
Svitlana Kravets
Keyword(s):  
Traffic Safety ◽  
Diagnostic System ◽  
Current Control ◽  
Intake Manifold ◽  
Fuel Injector ◽  
Diagnostic Equipment ◽  
Working Process ◽  
Sensors And Actuators ◽  
Working Volume ◽  
Onboard System

Modern cars are increasingly equipped with control and diagnostic equipment. These methods are used to optimize the working process in the engine, improve traffic safety and simplify operation and maintenance. You can adjust the chip to your liking, adjust the "performance" of the engine, because comfortable driving conditions give us a lot of pleasure. The current control of technical conditions is carried out by the onboard system of self-diagnostics, which is an integral part of the controller. Problems that occur are signaled visually and stored in electronic memory. The full list of actual settings of codes of self-diagnostics and parameters of working process is carried out on HUNDRED with automobile indicators of brand. The problem is determined only by connecting a tester or scanner to a special diagnostic connector available in the car. However, there are often complaints about objective and comprehensive examinations. Misdiagnosis of "standards" with obvious signs of external problems is often given for many reasons. First of all, the use of information is limited electrical signals. In fact, the state of the circuit of sensors and actuators of engine automation is determined. Degradation of complex structures is usually based on the "domino principle": one local problem leads to another, another to a third, etc., which leads to the complete failure of the whole device. Problems with electricity may not be the cause but the consequences of other problems, including non-electrical causes. For example, the "ringing" of the piston fingers may indicate early inflammation and wear of the relevant components. The instability of the spark discharge in the spark plug may be the result of decompression of the working volume of the cylinder or improper preparation of the working mixture. The problem of the intake manifold or contamination of the fuel injector is usually recognized by the self-diagnostic system as a fault of the lambda detector. The list of such ambiguities can be expanded. When it is necessary to "restore" the accident of "decent age", branded diagnostic equipment may be useless.

Study on High-Speed Switch Shifting Solenoid Current Control Technology for Automatic Transmission

2014 ◽  
Vol 1006-1007 ◽  
pp. 639-642
Author(s):  
Chun Fu Li ◽  
Yan Qin Li
Keyword(s):  
High Frequency ◽  
High Speed ◽  
Automatic Transmission ◽  
Current Control ◽  
Control Technology ◽  
Working Process ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Long Time ◽  
The Ideal

The purpose of the solenoid current control is to decrease holding current of the solenoid by selecting suitable frequency and duty, to keep the solenoid opening reliably for a long time and reduce power consumption and improve the solenoid close feature. In this paper, the high frequency signal in oil pressure holding process is determined by theoretical analysis and experimental study. The purpose of the study is to determine the ideal current in the working process of the solenoid.

Cyclic Variability in Diesel/Gasoline Dual-Fuel Combustion on a Medium-Duty Diesel Engine

2013 ◽  
Author(s):  
Jiafeng Sun ◽  
Joshua A. Bittle ◽  
Timothy J. Jacobs
Keyword(s):  
Diesel Engine ◽  
Heat Release ◽  
Gasoline Fraction ◽  
Fuel Spray ◽  
Intake Manifold ◽  
Dual Fuel ◽  
Injection Timing ◽  
Fuel Injector ◽  
Cyclic Variability ◽  
Diesel Operation

Most studies comparing diesel/gasoline dual-fuel operation and single-fuel diesel operation in diesel engines center on time-averaged results. It seems few studies discuss differences in cyclic variability. Motivated by this, the present study evaluates the cyclic variability of combustion in both dual-fuel and single-fuel operations of a diesel engine. Steady-state tests were done on a medium duty diesel engine with conventional direct injection timings of diesel fuel into the cylinder at one speed and three loads. In addition to single-fuel (diesel) operation, dual-fuel (gasoline and diesel) operation was studied at increasing levels of gasoline fraction. Gasoline fuel is introduced via a fuel injector at a single location prior to the intake manifold (and EGR mixing location). Crank-angle resolved data including in-cylinder pressure and heat release rate obtained for around 150 consecutive cycles are used to assess cyclic variability. The sources of cyclic variability, namely the factors causing cyclic variability or influencing its magnitude, especially those related to cylinder charge amount and mixture preparation, are analyzed. Fuel spray penetration and cyclic variability of cylinder charging, overall A/F ratio, and fuel injection timing, tend to increase cyclic variability of combustion in dual-fuel operation. On the other hand, fuel type and fuel spray droplet size tend to increase cyclic variability in single-fuel operation. The cyclic variability in dual-fuel operation in this study is more serious than that in single-fuel operation, in terms of magnitude, indicated by metrics chosen to quantify it. Most measures of cyclic variability increase consistently with increasing gasoline fraction. Variations of gasoline amount and possibly gasoline low temperature heat release cause higher combustion variation in dual-fuel operation primarily by affecting premixed burning. Statistical methods such as probability density function, autocorrelation coefficient, return map, and symbol sequence statistics methods are used to check determinism. In general, the parameters studied do not show strong determinism, which suggests other parameters must be identified to establish determinism or the system is inherently stochastic. Regardless, dominant sequences and optimal sequence lengths can be identified.

scholarly journals Robotization as One of the Prospects for Electromobility in Belarus

2021 ◽  
Vol 6 ◽  
pp. 24-32
Author(s):  
Yankevich Natallia ◽  
Yankevich Stsiapan
Keyword(s):  
Diagnostic System ◽  
The European Union ◽  
Urban Centers ◽  
Ongoing Research ◽  
Instrument Making ◽  
Time Simulation ◽  
Zero Carbon ◽  
The Republic ◽  
Onboard System ◽  
Executive Level

In order to create a competitive and resource-efficient transport system, the transport policy of the European Union provides for the achievement by 2030 of almost zero carbon dioxide content in the exhaust gases of vehicles used in large urban centers, and by 2050 the phasing out the use of cars, working on traditional fuels. The Republic of Belarus has a high scientific and sufficient industrial potential to participate in the process of promoting electric mobility, taking into account the use of robotics. JSC "Instrument-Making Plant Optron" developed the working documentation and produced prototypes of typical representatives of the line of personal electric vehicles. However, the ongoing research focused on the creation of a preventive diagnostic system for the electric motorcycle, developed by Belarussian researches and its intelligent onboard system, focused primarily on real-time simulation processes, related specifically to the level of artificial intelligence, and on the implementation of executive level algorithms.

Two-Stage Lean-Burn Combustion Inside a Natural-Gas Spark-Ignition Engine With a Bowl-in-Piston Chamber

2019 ◽  
Author(s):  
Jinlong Liu ◽  
Cosmin E. Dumitrescu
Keyword(s):  
Natural Gas ◽  
Combustion Chamber ◽  
Combustion Process ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Intake Manifold ◽  
Hydrocarbon Emissions ◽  
Fuel Injector ◽  
Unburned Hydrocarbon ◽  
Piston Chamber

Abstract The conversion of existing diesel engines to spark ignition (SI) operation by adding a low-pressure injector in the intake manifold for fuel delivery and replacing the original high-pressure fuel injector with a spark plug to initiate and control the combustion process can reduce U.S. dependence on petroleum imports and increase natural gas (NG) applications in heavy-duty transportation sectors. Since the conventional diesel combustion chamber (i.e., flat-head-and-bowl-in-piston-chamber) creates high turbulence, the converted NG SI engine can operate leaner with stable and repeatable combustion process. However, existing literatures point to a long late-combustion duration and increased unburned hydrocarbon emissions in such retrofitted engines that maintained the original combustion chamber. Consequently, the main objective of this paper was to report recent findings of NG combustion characteristics inside a bowl-in-piston combustion chamber that will add to the general understanding of the phenomena. The new results indicated that the premixed NG burn inside the bowl-in-piston combustion chamber will separate into a bowl-burn and a squish-burn processes in terms of burning location and timing. The slow burning event in the squish region explains the low slope of the burn rate towards the end of combustion in existing studies (hence the longer late-combustion period). In addition, the less-favorable conditions for the combustion in the squish region explained the increased carbon monoxide and unburned hydrocarbon emissions.

scholarly journals IMPROVEMENT OF EXTRUDER WORKING PROCESS WITH TERMOVACUAL EFFECT

2019 ◽  
Vol 4 (2) ◽  
pp. 84-89
Author(s):  
Анатолий Курочкин ◽  
Anatolii A Kurochkin
Keyword(s):  
Flow Rate ◽  
Vacuum Chamber ◽  
Raw Materials ◽  
Volumetric Flow Rate ◽  
Extrusion Process ◽  
Technological Parameters ◽  
Working Process ◽  
Thermal Vacuum ◽  
Working Volume ◽  
Vacuum Effect

The research aim is a theoretical substantiation of the increase in the efficiency of extrudate dehydration due to the supply of air into the vacuum chamber of a modernized extruder with a thermal vacuum working process. On the basis of modern study of the implementation of the thermodynamic process in the interaction of three different air flows in a limited volume of the vacuum chamber of the extruder, one possible way of increasing the efficiency of the finished product dehydration was theoretically justified. In the previously proposed constructive-technological scheme of the extruder, the insufficiently intensive dehydration of the finished product leaving the die of the ma-chine is associated with a relatively low air flow rate at the surface of the cooling extruder. These speed limits the transfer rate of the liquid removed from the extruder by means of wet steam, which is withdrawn from the vacuum chamber of the extruder into a vacuum balloon and condenses. In a modernized extruder, the effect of thermal vac-uum effect is proposed to be enhanced by means of a metered supply of air into the working volume of the extrud-er’s vacuum chamber. The conducted research allowed obtaining analytical expressions with the help of which it is possible to determine the volumetric flow rate of air injected into the vacuum chamber of the machine and to deter-mine its effect on the main structural and technological parameters of the system that ensures the thermal vacuum effect of the extrusion process. The relationship between the coefficient taking into account the influence of the thermal vacuum effect in an autogenous extruder on other significant technical and technological parameters of the machine is shown. The results obtained can be useful and considered in the course of subsequent theoretical stud-ies of extruders with a vacuum chamber and will allow on their basis increasing the efficiency of the machines per-forming the thermal vacuum extrusion of raw materials of plant origin.

scholarly journals Development of on-board Diagnostic Systems for Vehicles to Improve their Reliability

2021 ◽  
Vol 334 ◽  
pp. 01037
Author(s):  
Aleksandr Kulakov ◽  
Eduard Muhametdinov ◽  
Eduard Tsybunov ◽  
Ayrat Badriev
Keyword(s):  
Traffic Safety ◽  
Diagnostic System ◽  
Air Pressure ◽  
Brake System ◽  
Diagnostic Systems ◽  
Diagnostic Parameters ◽  
Functional Systems ◽  
Machine Parts ◽  
The Relationship

The article is dedicated to various questions of control and diagnostics of automobile technical conditions by applying on-board diagnostic system. The structure of automated diagnostic system was analyzed. Various types of sensors, signals and required types of their transfigurations were enlisted . The relationship between the structural and diagnostic parameters of the car is given, where all systems and car units are divided into groups. The first group consists of systems, units and machine parts that provide traffic safety, the second group contains the remaining functional systems. A structural and investigation scheme for diagnosing automobile’s brake gear with an air pressure brake system was developed.

scholarly journals INFLUENCE OF AIR TEMPERATURE ON DURATION OF IMPULSE OPENING SPRAY IN THE ENGINE INTAKE MANIFOLD WHILE CAR OPERATION IN VARIOUS CONDITIONS

2019 ◽  
Vol 16 (1) ◽  
pp. 32-39
Author(s):  
B. U. Akunov ◽  
K. Dj. Kasymbekov
Keyword(s):  
Air Temperature ◽  
Control Unit ◽  
Operating Conditions ◽  
Intake Manifold ◽  
High Mountain ◽  
Fuel Injector ◽  
The Road ◽  
Impulse Duration ◽  
Air Intake ◽  
Nozzle Opening

Introduction. The air temperature in the intake manifold is used by an electronic engine control unit to adjust the injection time of the fuel injector top. The intake air temperature is variable and depends on the operating conditions of the vehicle. When air intake temperature decreases, the duration of the nozzle opening pulse increases and, conversely, as air intake temperature increases, the duration of thenozzle opening pulse decreases.Materials and methods. The paper demonstrates the analysis of the air temperature effect in the intake manifold of the engine on the duration of the injector opening pulse while the engine is idling and when the vehicle is moving with different speed conditions on the flat,  mountainous and alpine sections of the road.Results. As a result, the research showes that the movement of the car at high speeds on the flat sections of the road leads to a significant decrease of air temperature in the intake manifold and an increase in the duration of the injector opening pulse. Moreover, when the vehicle moves on the mountainous sections of the road, the effect of air temperature in the intake manifold on the nozzle opening impulse duration is insignificant, since the speed of the vehicle movement is influenced by the complexity of the terrain and the parameters of the mountain and high-mountain roads. 

European railways on the way to the digital future

2021 ◽  
Vol 2 (2) ◽  
pp. 213-220
Author(s):  
V. I. Tiverovsky
Keyword(s):  
Traffic Safety ◽  
Management System ◽  
Safety Management ◽  
Diagnostic System ◽  
European Countries ◽  
Practical Implementation ◽  
Railway Transport ◽  
Safety Assurance ◽  
Train Control ◽  
Modern Technologies

The issues of development and practical implementation of control systems and devices and traffic safety assurance, which lead to the digital future of railways, are considered. The main directions of digitalization of European railways are presented. The role and importance of the European Train Management System (ETCS) and the European Train Management and Safety Management System (ERTMS) are shown. Both systems are being implemented on the railways of European countries in stages (levels). Various systems of centralization of points and signals are gradually being replaced by digital centralization (DSTW). At the same time, much attention is paid to equipping railway crossings with modern automation and traffic safety. In different European countries, research and development work is being carried out and projects for the automation of train control are being implemented. At this stage, the automation process is being carried out more actively in public transport, especially successfully in the metro. The increasing use of distributed diagnostic components in rail transport has been observed along with the growing demand for a centralized diagnostic system. The works in the field of using the capabilities of artificial intelligence, machine learning and other modern technologies are noted. The study of foreign experience in digitalization of railway transport is useful to take into account when solving the problems of development and digitalization of Russian railways.

scholarly journals Optimization of critical angle, distance and flow rate of secondary fuel injection in DI diesel engine using computational fluid dynamics

2021 ◽  
Vol 3 (1) ◽  
Author(s):  
M. Sonachalam ◽  
V. Manieniyan
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Rate ◽  
Fuel Injection ◽  
Combustion Process ◽  
Superior Performance ◽  
Intake Manifold ◽  
Fuel Injector ◽  
Performance And Emission ◽  
Secondary Fuel

AbstractThis study presents the optimization of the intake manifold and the optimized flow rate of the acetylene gas which acts as a low reactivity fuel to achieve the superior performance and emission characteristics used in the Reactivity controlled compression ignition (RCCI) engine. Intake manifold is one of the engine components which are an important factor in determining the quality of combustion. A very recent evolution of the RCCI engine using the low temperature combustion technique requires a low reactivity fuel which is injected through the secondary fuel injector. The secondary fuel injector must be designed and optimized to allow the acetylene gas to maximize the engine performance and the amount of acetylene gas in liters per minute required for better combustion. If the secondary fuel injector is mounted apart from the critical point, then the performance of the RCCI engine may be poor and also if the acetylene gas is not supplied properly, there is a risk of poor combustion and also if the acetylene gas is supplied excessively, there is a risk of knocking along with the backfire due to the excess fuel charge accumulation during the combustion process. Physical testing of the secondary fuel injector in the intake manifold with different angles, distance and flow rate of supply of acetylene gas is time and cost consuming process. To mitigate this issue optimization is done through computational fluid dynamics principles comes in handy to minimize time and money. In our study, ANSYS-FLUENT software is used for simulation purposes. Optimization of acetylene gas injector distance is carried out by analyzing the pressure contours at the entrance of the combustion chamber. The optimized flow rate of acetylene gas and the injector inclination is found by analyzing the flow contours of turbulent kinetic energy and turbulent dissipation rate.

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