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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...
With the application of multiple-pulse fuel injection profiles, the performance of diesel engines is enhanced in terms of low fuel consumption and low engine-out emission levels. However, the calibration effort increases due to a larger number of injection timing parameters. The difficulty of controlling the combustion phase also increases because of coupling between individual fuel injection pulses...
Diesel-fuelled compression ignition engines find wide range of applications from light duty to heavy duty engines, also exhibiting higher fuel conversion efficiencies than that of petrol-fuelled spark-ignition engines. However, diesel engines suffer from high NO and soot emissions with trade off, making the development of high efficiency and less polluting engines a necessity. Hence understanding...
Combustion chamber geometry is very important for the performance of diesel engine, especially for the nonroad diesel engine with low fuel injection pressure. To decrease the experimental work, the CAE technique, such as computational fluid dynamics (CFD), was used to design the combustion chamber of a nonroad diesel engine. In order to investigate the effects of combustion chamber geometry on mixture...
The numerical simulation was carried out by building methane-diesel fuel model at the base of physical model and basic control equation of hydrodynamics, by adopting non-premix combustion method, by simplifying combustion as blends, and by calculating blend fraction. Furthermore, its combustion press field, temperature field and velocity field were analysed. Finally, the experimental results indicated...
The paper integrates in the today's trend, for the use of partial derivatives, in modeling and numerical simulation of the distributed parameters processes and systems. It is presents, in a simplified version, a study case based on the matrix with partial derivatives of the state vector (Mdpx), associated with Taylor series, for modeling and numerical simulation of a Diesel engine for railway traction,...
An evaluation of the Computational Fluid Dynamics (CFD) sub-models for in-cylinder diesel engine combustion and emission simulations was conducted using an integrated numerical model from commercial CFD software FLUENT 6.3.26. As these simulations are sensitive to user-defined empirical parameters, the main aim of this investigation is to obtain an adjusted set of model parameters in order to achieve...
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