scholarly journals Monitoring of the state of electromagnetic fuel injectors of gasoline engines with distributed fuel injection systems

2021 ◽  
Vol 18 (5) ◽  
pp. 524-533
Author(s):  
G. N. Votinov ◽  
D. V. Maltsev ◽  
D. S. Repetsky
Keyword(s):  
Pressure Drop ◽  
Fuel Injection ◽  
Combustion Engine ◽  
Technical Condition ◽  
Engine Fuel ◽  
Negative Consequences ◽  
Passenger Cars ◽  
Correct Operation ◽  
Fuel Injectors ◽  
Drop Rate

Introduction. Ensuring the trouble-free operation of road transport is one of the priority tasks. The functioning of the internal combustion engine, the most important unit, is impossible without the correct operation of the fuel injectors. A modern electromagnetic nozzle is a fairly reliable element of the engine, however, it can quickly fail when using low-quality fuel. Constant monitoring of the technical condition of the injectors with the help of builtin vehicle diagnostics systems will prevent such negative consequences as fuel overspending, the formation of harmful substances in the exhaust gases, deterioration of the traction and speed characteristics of the vehicle.Materials and methods. The research was carried out by the method of physical modelling, a laboratory stand was developed that simulates the operation of the engine fuel system. As an object, the Bosch 0280 158 996 nozzle was selected, which was controlled using an Arduino-based electronic unit. A series of one-factor experiments was carried out, according to the results of which the dependence of the pressure drop rate on the contamination of the nozzle was constructed.Results. The permissible standard of the pressure drop rate during the operation of the electromagnetic nozzle is determined, which allows unambiguously determining its technical condition (serviceable/not serviceable). An algorithm for checking injectors is proposed, as well as a method for its implementation on modern passenger cars.Discussion and conclusion. The obtained dependence qualitatively coincides with the results of studies by other authors. There is a successful experience of implementing such algorithms on modern cars. The implementation of the research results will allow timely detection of faulty (contaminated) electromagnetic injectors and prevent negative effects on both engine parts and the environment.

scholarly journals SI engine fuel mixture type indicator and an assessment of its suitability of an economic driving style

2021 ◽  
Author(s):  
Zbigniew Wołczyński ◽  
Mikołaj Żak
Keyword(s):  
Urban Areas ◽  
Fuel Injection ◽  
Fuel Mixture ◽  
Spark Ignition Engine ◽  
Engine Fuel ◽  
Driving Style ◽  
Correct Operation ◽  
Type Indicator ◽  
Noticeable Reduction ◽  
Direct Fuel Injection

The article presents the structure and a principle of operation of a simple indicator of the type of a fuel-air mixture supplying a spark-ignition engine with a direct fuel injection. The designed indicator was tested, as a result of which its correct operation was verified. By using information from the indicator, it was possible to assess its usefulness for assisting the driver in an economical driving style. Preliminary studies show that thanks to the use of the developed indicator, it is possible to save about 10% of fuel as a result of the correction of the economic driving style on the route selected for the purpose of this research paper. The target of this study was to confirm a noticeable reduction in fuel consumption when supplying the engine with a stratified mixture. In order to obtain more accurate data, the research should be extended to include a greater number of routes and its division into urban and non-urban areas.

Application of HFRT Methods to Diagnose the Technical Condition of High-Speed Marine Diesel Engines

2015 ◽  
Vol 236 ◽  
pp. 161-168
Author(s):  
Tomasz Lus
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Combustion Process ◽  
Technical Condition ◽  
Injection System ◽  
Engine Fuel ◽  
Naval Academy ◽  
Marine Diesel

The paper presents problems related to testing of the technical condition of high-speed marine diesel engines that are not equipped with indicated valves, as it is in the case of larger medium-and low-speed marine internal combustion engines. In this case, in assessment of technical condition of engine fuel injection system and valve gear system a vibration signals (in time / angle domain) analysis modified method called HFRT (High Frequency Resonance Technique) can be used. This method indirectly helps also to evaluate the fuel combustion process in the engine cylinders. The paper presents the theoretical basis of a modified HFRT method, physical implementation of the marine diesel engine system’s analyzer used for marine engines testing built at the Institute of Construction and Operation of Ships at Polish Naval Academy (PNA) in Gdynia. The paper also includes a description of the vibration signal processing methodology and examples of measurements made in the ships conditions for a few selected types of engines.

scholarly journals Laboratory assembly for analysis of fuel injection systems in the modern internal combustion engines

2014 ◽  
Vol 8 (1) ◽  
pp. 54-58
Author(s):  
Vasile Alexa ◽  
Sorin Ratiu ◽  
Imre Kiss
Keyword(s):  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Combustion Engine ◽  
Internal Combustion ◽  
Injection System ◽  
Fuel Injection System ◽  
Fuel Injectors ◽  
Extra Effort ◽  
Experimental Stand ◽  
System Data

The complexity of the processes taking place in a system of fuel injection management for an internal combustion engine requires extra effort for a proper understanding of the operating principles. This paper is intended to be an intuitive practical application able to simulate the complex electronic control of injection, through a PC and specialized software. The application provides an intuitive and friendly analysis of the processes occurring during the operation of an injection computer. Moreover, the system allows the determination of the gasoline amount injected by the various types of fuel injectors, in a certain period of time and at different pressures of the fuel, depending on the load, speed and thermal regime of the engine. The laboratory assembly for a fuel injection system is intended as an experimental stand with exclusive didactical applicability. We want to observe the main characteristics of a fuel feeding and injection system, as the identification of components for the control system, data acquisition system and fuel injection system, the analysis of the different types of signals that can be used to actuate the injectors, the establishing the principles of injector operation in accordance with the control electronics, the visualization of the injection cadence and amount injected, depending on the engine speed and load, the programming of injection computers etc.

Air Fuel Ratio Estimation Using In-Cylinder Pressure Frequency Analysis

2003 ◽  
Vol 125 (3) ◽  
pp. 812-819 ◽  
Author(s):  
N. Cavina ◽  
F. Ponti
Keyword(s):  
Frequency Analysis ◽  
Closed Loop ◽  
Fuel Injection ◽  
Combustion Engine ◽  
Control Strategies ◽  
Feedback Signal ◽  
Exhaust Gas ◽  
Cylinder Pressure ◽  
Passenger Cars ◽  
Fuel Ratio

This paper presents an original approach to estimate the air-fuel ratio (AFR) of the mixture that burned inside a given cylinder of a spark-ignited (SI) internal combustion engine, using the information hidden in the corresponding in-cylinder pressure signal. In modern closed-loop fuel injection control strategies, the feedback signal is usually given by one (or more) heated exhaust gas oxygen (HEGO) sensor(s), mounted in the exhaust manifold(s). The information that such sensors give is related to the stoichiometry of the mixture that burned inside the cylinders. The HEGO sensor is not able to evaluate the AFR value precisely, being only able to determine whether the mixture was rich or lean. This information is sufficient to allow the implementation of a closed-loop strategy for injection time control. Generally speaking, such strategy could be improved in terms of readiness and precision by directly measuring (or by estimating) the actual AFR. Universal exhaust gas oxygen (UEGO) sensors are still considered expensive and their use is mostly limited to laboratory and racing applications, even if some automotive manufacturers have started installing such sensors on board passenger cars, as part of an effort to comply with ULEV (ultra low emission vehicles) regulations. For this reason the idea of estimating AFR values from other signals has received great attention in the past few years. A new approach based on in-cylinder pressure frequency analysis is presented here.

Calculating Study of the Diesel Engine Working Process

2020 ◽  
Keyword(s):  
Diesel Engine ◽  
Compression Ratio ◽  
Fuel Injection ◽  
Combustion Engine ◽  
Fuel Efficiency ◽  
Engine Fuel ◽  
Gas Distribution ◽  
Working Process ◽  
Optimal Values ◽  
Efficiency Indicators

A calculating study of the working process of the D-245 diesel engine (4 ChN 11/12,5) produced by the Minsk motor plant is carried out. The influence of compression ratio, fuel injection advance angle and gas distribution phases on the fuel efficiency indicators of the diesel engine under consideration is studied. The optimal values of the diesel engine parameters in various modes of operation are determined. Keywords internal combustion engine, diesel engine, fuel efficiency, compression ratio, fuel injection advance angle, gas distribution phases

scholarly journals Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 996
Author(s):  
Venera Giurcan ◽  
Codina Movileanu ◽  
Adina Magdalena Musuc ◽  
Maria Mitu
Keyword(s):  
Gas Turbines ◽  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
Combustion Engine ◽  
Burning Velocity ◽  
Internal Combustion ◽  
Electricity Production ◽  
Engine Fuel ◽  
Laminar Burning Velocity ◽  
Waste Products

Currently, the use of fossil fuels is very high and existing nature reserves are rapidly depleted. Therefore, researchers are turning their attention to find renewable fuels that have a low impact on the environment, to replace these fossil fuels. Biogas is a low-cost alternative, sustainable, renewable fuel existing worldwide. It can be produced by decomposition of vegetation or waste products of human and animal biological activity. This process is performed by microorganisms (such as methanogens and sulfate-reducing bacteria) by anaerobic digestion. Biogas can serve as a basis for heat and electricity production used for domestic heating and cooking. It can be also used to feed internal combustion engines, gas turbines, fuel cells, or cogeneration systems. In this paper, a comprehensive literature study regarding the laminar burning velocity of biogas-containing mixtures is presented. This study aims to characterize the use of biogas as IC (internal combustion) engine fuel, and to develop efficient safety recommendations and to predict and reduce the risk of fires and accidental explosions caused by biogas.

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