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The demand for higher output efficiencies, greater specific power output, increased reliability, and ever reduced emissions has been rising. Due to its availability one promising alternative is the use of ethanol in internal combustion engines. In this study, the effects of ethanol addition (5%, 15% and 25% by volume) to diesel fuel on the performance and exhaust emissions of a 6 cylinder four stroke...
Rejuvenation and updating of a power generation technology is to make it more efficient, more reliable, and more environmentally friendly. Those conditions encourage the rejuvenation of Pesanggaran Bali power plant. Currently the power plant uses a diesel engine which emit a 978,448 ton of CO2 annually. The plan is to replace the diesel engine with gas engine with capacity of200 MW to generate electricity...
In order to stabilize the engine speed, increase the dynamic performance, save the energy, this paper presents a speed sensing control method for an EFI engine. The best operating points of an engine were discussed according to the static characteristics of an engine. Based on the best operating points and the load, the engine speed could be controlled by a double-closed loop control method, which...
The diesel engine is a typical multi-input multi-output system with strong couplings, actuator constraints, and fast dynamics. The objective is to operate the engine to meet driver's speed demand and reduce exhaust emissions of nitrogen oxides (NOx) during transient process. Interactions between the actuators and nonlinear behavior of the system make the problem difficult to handle using classical...
In this paper, optimization problem of after treatment system is investigated for diesel engines with lean NOx trap (LNT). First, a control-oriented LNT model is developed based on energy and mass balancing rules. Then, the optimization problem is formulated as a dynamic programming (DP) problem under developed dynamical model constraint and a trade-off between fuel economy and NOx emission is considered...
This paper presents an economic model predictive control (eMPC) controller for the diesel engine airpath. The control objective is to maximize fuel economy while maintaining drivability and reducing emissions by manipulating the exhaust gas recirculation (EGR) valve, throttle, variable geometry turbine (VGT), and the fueling rate. This is achieved using a cascaded architecture wherein an upper level...
Future frigates need to reduce fuel consumption and emissions, while improving effectiveness. This paper quantitatively compares top speed, fuel consumption, emissions, acceleration performance and engine loading of hybrid diesel-electric and gas-turbine-electric propulsion, using validated models and introducing sequential turbocharging and power take-off. This simulation study demonstrates hybrid...
One of the most critical situations in the operation of medium and low speed synchronous generators appears when they are subjected to torque imbalances. This could be the case of internal combustion engines driven generators. In these engines, torque has a periodic oscillation due to variations in the combustion process and pressure development between cylinders. Consequently, a fuel excess or a...
In this paper, a nonlinear speed control scheme based on the sliding mode control (SMC) for variable speed operations of diesel engine-generator (EG) sets is proposed. At first, the mathematical model representing the relation among engine speed, governor current and mechanical torque is derived. Then, the SMC-based speed controller for EG is designed. The proposed method can provide the fast reference...
The air filter is an important part in an automobile, with clogged air filters the engine may face a lot of problems. Filter clogging is an important problem but it is ignored. A lot of problems faced in vehicles are due to clogging of air filters. The objective of this study is to investigate and compare the effect of different stages of filter clogging on performance and emissions from engine. The...
Diesel engines in both the automotive and industrial sectors are nowadays electronically controlled. Electronic control provides accurate real time processing of the relevant sensory data on which fuelling is determined. Fuel economy as well as emissions are very dependent on the diesel fuel quantity, timing and injection pressure, which in turn determines the shape of the injection rate diagram,...
Typical microgrid configurations include small-scale generation units that belong to the class of reciprocating engines (gas, diesel, heavy fuel oil). A simplified equivalent model for representing the frequency response of a given set of this kind of generators is proposed in this paper. The model parameters are tuned to obtain frequency responses compliant with the performance classes stated by...
The fear of fuel depletion necessities the integration of energy saving methodologies for electric power generation. Diesel engines are common for back-up/standby electric power generation units. Being compression-ignition based, in contrary to gasoline engines, the enrichment of the air intake of diesel engines with Hydrogen improves the fuel burning process, leading to better fuel consumption. Wet/dry...
Diesel Engine Generators (DEGs) are used to generate power but in the process produce emissions of toxic air pollutants (taps). These ‘taps’ include Particulate Matter (PM) and Oxides of Nitrogen (NOx) which are harmful to humans and the environment. This paper has investigated the effect of retrofitting a 15kVA DEG using Retrofitted Diesel Fuel (RDF) and Pure Diesel Fuel (PDF). The data obtained...
This contribution introduces a nonlinear model predictive control (MPC) algorithm for diesel engines. Inequality constraints, e.g. emission limits, are taken into account by an augmented Lagrangian formulation in order to provide a time and memory efficient algorithm that is suitable for a future ECU implementation. In view of a practical application and for the sake of a modular framework, the MPC...
The present paper evaluates the comparative improvement of performance and emission of naturally aspirated, multi i.e. four cylinders four strokes, direct injection, Kirlosker diesel engine using various additive based diesel fuel. Five different additives namely 1-butanol, propan-2-ol, oleic acid, ethyl acetate, and 1-dodecanol were mixed in 1%, 2%, 3% on volume basis with diesel fuel. The engine...
Use of water emulsified diesel (WED) has overcome the difficulties of simultaneous reduction of both nitrogen oxides (NOx) and particulate matter (PM) emission from diesel engines. Its application in CI engines also reduces the emission of other pollutants like hydrocarbon (HC), carbon monoxide (CO) and smoke. In this article, the authors have studied the combustion and performance characteristics...
This paper presents a study on tackling full load request in air path control of a turbocharged diesel engine. The adopted approach is based on nonlinear model predictive control that employs a specially tailored model that can be embedded and simulated at Engine Control Unit (ECU). The derived air path model of a turbocharged engine comprises of one differential equation and a set of algebraic equations...
Advanced Modeling Environment for performing Simulations of engineering systems (AMESim) is a multi-domain software that allows interconnection between different type of physical systems. It also allows to reproduce their dynamic behaviors under various scenarios and to analyze their operation. In this paper, AMESim software is introduced in order to validate the developed control laws. In fact, an...
Based on the self-developed high pressure common rail diesel engine electronic control unit (ECU) and the rail pressure control model, the setting values control strategies for the target pressure step response of the engine under dynamic conditions were studied. The change rate and gradient of the target rail pressure were limited to track changes and change trend of target rail pressure which was...
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