Electronic Fuel Control System Research Articles

Способ выравнивания мощностей цилиндров многоцилиндрового тепловозного дизеля

Purpose: Labor intensity reduction and equalization accuracy improvement of cylinder powers of a multi-cylinder diesel locomotive on account of application as a diagnostic parameter, characterizing cylinder power unevenness, — the energy of low-frequency band of spectrum for crankshaft instantaneous angular velocity (CIAV) signal. Methods: Methods of mathematical modeling of diesel crankshaft instantaneous angular velocity, mathematical modeling of diesel engine working process, digital signal processing, spectral analysis, differential calculus and multidimensional non-differentiable function optimization are used in the work. Results: Method for equalization of cylinder powers of a multi-cylinder diesel locomotive that’s based on a continuous monitoring of the spectrum of crankshaft instantaneous angular velocity signal is proposed and justified. Energy of low-frequency band of the signal spectrum of CIAV can be used as a diagnostic parameter, characterizing cylinder load unevenness. The parameter value minimization by means of sequential correction of cyclic fuel supply and fuel advance angle ensures the decrease in the pointed unevenness. Practical importance: The proposed method can be used when adjusting fuel equipment after the repair of a diesel engine as with electronic fuel supply control systems as well as with hydromechanical fuel equipment. The use of the given method excludes the necessity of temperature measurement for exhaust gases and flash pressure measurement in cylinders for fuel equipment adjustment that’s especially important for high-speed diesel engines which cylinder heads’ construction doesn’t provide for indicator cocks. In the engines equipped with electronic fuel control systems, the use of IAV signal spectrum low-frequency band energy as a diagnostic parameter makes it possible to automate fully the equalization process for cylinder load. The result of the proposed method application will be the reduction in the duration and labor intensity of diesel locomotives rheostat tests as well as the rise in diesel locomotives reliability and efficiency at the expense of uniform loading of diesel cylinders.

ПЕРСПЕКТИВЫ ПРИМЕНЕНИЯ ЭЛЕКТРОННОЙ СИСТЕМЫ РЕГУЛИРОВАНИЯ ТОПЛИВОПОДАЧИ ДЛЯ ОДНОВАЛЬНОГО ГАЗОТУРБИННОГО ЭНЕРГОАГРЕГАТА

ПЕРСПЕКТИВЫ ПРИМЕНЕНИЯ ЭЛЕКТРОННОЙ СИСТЕМЫ РЕГУЛИРОВАНИЯ ТОПЛИВОПОДАЧИ ДЛЯ ОДНОВАЛЬНОГО ГАЗОТУРБИННОГО ЭНЕРГОАГРЕГАТА

Progress in electronic fuel injection control systems for automotive diesel engines

The fuel injection timing and the fuel quantity are two of the major parameters to be precisely controlled to optimise diesel engine. This paper presents a new electronic injection timing control based on direct sensing of the start of combustion. Although the injection timing is usually optimised against engine rpm and load, it is also affected by the atmospheric pressure, coolant temperature, fuel properties and injection rate deterioration. By using a start–of–combustion sensor the influence of these parameters on injection timing can be compensated for and the engine performance can be recovered. A new fuel quantity control has been also developed. Instead of 'spill ring' control, an electronic magnetic valve with fast response has been adopted, which enables more precise control of the amount of fuel injected.

Moog Servovalves

Crucial reductions in aircraft engine operating costs are being made possible by the introduction of electronic fuel control systems. These ‘FADEC’ (Full Authority Digital Engine Control) systems make it possible to achieve significant savings in fuel and maintenance costs as well as relieving the overburdened air crew in a critical area of flight management. Moog proportional servovalves are playing a vital role in these advanced control systems.

The Electronic Control of Gas Turbine Engines

The advances made in the development of gas turbine engines during the past two decades have been remarkable. The engines have been improved tremendously in terms of power, weight, efficiency and cost. They are now being applied successfully as the prime movers for helicopters, VTOL aircraft, ground power units and for many other diverse purposes, besides the more conventional military and civil aircraft.There have been parallel advances in the development of gas turbine engine fuel systems (which for convenience may be subdivided into the “control” and the “pumping arrangement”). These systems were originally wholly hydro-mechanical in nature. Sixteen or so years ago, the first supplementary electronic devices were introduced into fuel control systems. Since then, progressively more complex hybrid electronic/hydro-mechanical systems have been employed, with a corresponding easement of the demands on the hydro-mechanical portion. In 1957 Sturrock described to this Society what is now the classic Proteus engine control system used in Britannia aircraft. The satisfactory experience gained with the Proteus system led to the adoption of a comprehensive electronic fuel control system, coupled to a relatively simple fuel pumping system, for the supersonic Olympus engine. This system has been described by Hunt and by Colburn, Tweedy and Dent in papers presented at the joint RAeS/IEE conference “The Importance of Electricity in Aircraft” in 1962. Further papers by Rush presented at the same conference and by Airey in 1963, were devoted to the more general aspects of control.