Investigation of electrical fuel – injection pump characteristics of petrol engines in simulation of basic fuel system problems

2020 ◽  
pp. 18-27
Author(s):  
A. V. Gritsenko ◽  
◽  
K. V. Glemba ◽  
D. B. Vlasov ◽  
◽  
...  
Keyword(s):  
Fuel Injection ◽  
Technical State ◽  
Fuel System ◽  
Power Circuit ◽  
Injection Pump ◽  
First Case ◽  
Fuel Injection Pump ◽  
Technical Maintenance ◽  
Microprocessor Control System ◽  
Fuel Leakage

Technical state of electrical fuel-injection pumps of automobiles with petrol engines was evaluated with application of a multiple factor experiment, based on diagnostics test modes. There exist two main problems in the fuel system, connected with the fuel volume being injected into the fuel rail: clogging when the fuel flow to the rail and next to nozzles is hindered, wear out of elements in the pump part (due to an increasing clearance space between fuel-injection pump pulleys and casing the fuel flows over the tank, i.e., does not enter the system in sufficient volume). The studies showed that in the first case of fuel system problems the pump power circuit draws the current 4,6 А persistently depending on clogging extent. Such current rate is necessary for keeping high rotations of the pump elements, helping the pump to push through the necessary fuel volume into the fuel rail, making the essential pressure 310 кПа. In the second case the fuel does not enter the rail in sufficient amount either, but the current rate here is small (even smaller than the nominal reading). For example, in the largest fuel leakage it equals 2,5 A, power voltage being 12,5 V. The results and methods of experimental data treatment with MathCAD application are presented. The article materials are applicable for research, repair, technical maintenance organizations when they estimate technical state of fuel-injection low-pressure pumps ( including those which are installed on engines with microprocessor control system).

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.

Comparison of intake and exhaust throttling for diesel particulate filter active regeneration of non-road diesel engine with mechanical fuel injection pump

2020 ◽  
pp. 146808742092603
Author(s):  
Wonmo Kang ◽  
Sukang Pyo ◽  
Hongsuk Kim
Keyword(s):  
Fuel Consumption ◽  
Diesel Particulate Filter ◽  
Fuel Injection ◽  
Particulate Filter ◽  
Diesel Particulate ◽  
Air Mass ◽  
Filter Regeneration ◽  
Exhaust Temperature ◽  
Injection Pump ◽  
Fuel Injection Pump

Diesel particulate filter regeneration using intake and exhaust throttling is technically simple and economically efficient compared to other methods. The purpose of this study is to investigate not only the reasons for the increase in exhaust temperature during intake or exhaust throttling but also their feasibility as a diesel particulate filter regeneration technology. In this study, a non-road diesel engine having a mechanical fuel injection pump was used for experiments. The changes in exhaust temperatures were measured during intake and exhaust throttling for the no-load maximum revolutions per minute engine condition. The experimental results exhibited that both intake and exhaust throttling reduced the intake air mass flow rate and increased piston pumping, which then increased fuel consumption. These effects were the primary reasons for increasing the temperature of exhaust gases. In particular, intake throttling was more effective than exhaust throttling in terms of reducing the intake air mass flow rate. However, exhaust throttling caused larger pumping losses, resulting in higher fuel consumption. Furthermore, in case of exhaust throttling, engine combustion was possible even at high equivalence ratios because of the larger amounts of residual gases in the combustion chamber. In summary, exhaust throttling is more effective for regenerating a diesel particulate filter at a high temperature than intake throttling. In addition, this study verified the feasibility of diesel particulate filter regeneration using exhaust throttling through analyses of diesel particulate filter regeneration efficiency, fuel consumption, and exhaust concentration when regenerating the diesel particulate filter by increasing the exhaust temperature through exhaust throttling.

Paper 6: Torsional Vibrations in Fuel Injection Pump Drive Systems with Special Reference to Automotive Engines

1966 ◽  
Vol 181 (8) ◽  
pp. 84-90
Author(s):  
L. F. Martyn ◽  
T. M. B. Silcock
Keyword(s):  
Diesel Engine ◽  
Natural Frequency ◽  
Fuel Injection ◽  
Torsional Vibrations ◽  
Pump System ◽  
Automotive Engines ◽  
Injection Pump ◽  
Infinite Mass ◽  
Fuel Injection Pump ◽  
Drive Systems

The torsional vibrations which occur on the fuel injection pump of an automotive diesel engine were investigated. Calculations and tests showed that as well as vibrations transmitted from the crankshaft, the fuel pump could vibrate at the natural frequency of the torsional system consisting of the pump and the drive coupling against an infinite mass. This was excited by harmonic torques produced by the pump. Calculations were made to show the effect of variables on the natural frequency of the pump system including the instance when a crankshaft natural frequency coincided with a pump natural frequency. Calculations were also made of the effect of the engine harmonic torques on the pump vibrations. The results were verified by experiments.

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