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Engine model plays an important role in design and testing process of engine and its electronic control system. Based on the methodology of mean valve model, a nonlinear marine liquefied petroleum gas (LPG) engine model is proposed for control-oriented application. The model includes throttle model, intake manifold dynamic model, fuel delivery model, crankshaft speed model, air fuel ratio predicting...
Development of a mathematical model of air to fuel ratio and control for SI engines has been proposed in various themes to satisfy technical specification. This paper reveals a simple yet effective nonlinear control to enhance the regulator. The mean value engine model (MVEM) is employed and enhanced to validate the effectiveness of the proposed scheme. The regulator is designed using a discrete fuzzy...
High density terminal areas of large international airports present an extra challenge to 4D ATM concepts due to their traffic volume on the one hand and the traffic complexity on the other hand.
When airport arrival slots are scheduled in excess of the available capacity, the scheduled flights are assigned slots by a rationing scheme. The traditional approach is to ration slots by schedule (RBS) on a first-scheduled/first-assigned basis. This approach, although meeting equity criteria, can result in inefficient use of the arrival slots in terms of passenger throughput and fuel burn; however,...
Advancing the National Airspace System (NAS) generally requires research to project the costs and benefits of proposed operational changes that improve system efficiency and environmental performance. Aviation regulatory agencies increasingly rely on aircraft fuel consumption and emissions assessments to support investment decisions needed to adopt new technologies that ensure the best value to the...
This paper summarizes the findings of a pilot-in-the-loop simulation which examined the initial feasibility of an air traffic management operations concept for using a cockpit display of traffic information (CDTI) to support a delegated separation task in the vertical domain. In this concept a flight crew is directed to maintain safe vertical separation from one other aircraft during a climb through...
Developed by the Federal Aviation Administration (FAA), the Next Generation Air Transportation System project (NextGen) is an initiative working towards improvement of the National Airspace System (NAS). NextGen seeks to reduce both fuel consumption and the adverse environmental impacts of air transportation, while improving safety and accommodating foreseeable industry expansion. The NextGen project...
Historic data shows an increase in carbon dioxide (CO2) emissions at airports caused by an increase in aircraft flights, associated ground support equipment, flight operations, and passenger movements. Despite rising concerns over the potential effects of anthropogenic activities on earth's climate, there is no singular ownership of the problem and therefore no commitment to fund change. There exists...
A new rapid premixed pre-evaporation model nozzle is designed in this paper. The nozzle performances such as mixed effect, average evaporation time of droplet and total pressure loss, heat and mass transfer, and flameless combustion characteristics etc. are CFD numerical predicted. The results provide some references for the new premixed flameless combustion mode.
supercharged boiler is widely used in large ships as a main power plant because of its small size and weight, high thermal efficiency and volumetric heat load. Based on the fluent software, this paper uses k-ε turbulence model and the simplified PDF model to simulate different locations of Steady flame device. Through analyzing the variation tendency of recirculation zone, the flame length, the maximum...
Extending fuel cell lifetime is a necessary objective for reducing fuel cell power generation cost of electricity. Capital costs comprise the most significant fraction of the cost of electricity. Reducing the frequency of fuel cell replacement can be achieved by implementing a control strategy that prevents excursions into operating regions causing failure. In this paper we implement a constrained...
Diesel oxidation catalysts (DOCs) have become standard components in Diesel engine aftertreatment systems to reduce carbon monoxide (CO) and unburned hydrocarbon (HC) emissions. Intensive studies have been focused on improving the performance of DOCs which has been found to be influenced significantly by its thermal behaviors. The objective of this research is to develop a control-oriented thermal...
This paper presents an air- and fuel-path coordinated methodology for Diesel engine advanced combustion mode transient control. In the air-path loop, a reference governor method was utilized for the control of intake manifold conditions, so as to the in-cylinder conditions (ICCs) at the crank angle of intake valve closing. In the fuel-path loop, the active and rapid fuel injection timing and mass...
The problem of regulating the fresh mass air flow MAF and the absolute pressure in the intake manifold MAP in the air path of a Diesel engine to set-point reference values is considered here. To begin with, a NARX model of the air path of a Diesel engine is obtained in terms of two (coupled) difference equations from input/output measurements of the actual system. A continuous-time state-space representation...
The three way catalytic converter (TWC) is a critical component for the mitigation of tailpipe emissions of modern spark ignition internal combustion (IC) engines. Because the TWC operates effectively only when the air-fuel ratio is very close to stoichiometric, accurate control of the air-fuel ratio is required. This paper uses a switching linear parameter varying (LPV) controller to regulate the...
The present work is about the investigation of non-premixed combustion when primary air is introduced with swirl. CFD modeling of combustion of methane is accomplished using a Navier-Stoke solver. For turbulence modeling, k-epsilon realizable model is used. Axial and tangential velocities of air and combustion products are calculated at different axial locations to compare with experimental results...
In this paper, a fourth-order dimensional nonlinear model is proposed for a diesel engine equipped with a Variable Geometry Turbocharger (VGT) and an Exhaust Gas Recirculation (EGR) valve. The referred model which takes into account the engine crankshaft speed dynamics and the air-path dynamics is a non-minimum phase unstable system. The fuel flow rate Wƒ which is considered as input for the engine...
Distributed Generation (DG) play an active role in the distribution network due to its minimum loss, maximum efficiency and environmental impact. Moreover DG can supply base load power which improves the system stability, reliability and power quality. Among the different combined DG systems like solar with wind, tidal with geothermal and others, fuel cell with microturbine is the most economical...
An innovative combustion controller is developed with an objective to maintain the steam pressure inlet to the turbine in a thermal power plant at a predetermined value by modulating proper air/fuel controller under varying load conditions. An energy balance model based fuzzy controller is designed to maintain proper fuel flow throughout the combustion cycle. The fuel flow requirement with respect...
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