Coordinated EGR-VGT Control for Diesel Engines: an Experimental Comparison

Nieuwstadt, M.J. van; Kolmanovsky, Ilya; Moraal, P.E.

doi:10.4271/2000-01-0266

Cited by 39 publications

(19 citation statements)

References 12 publications

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“…Close control of these factors reduces cyclic and cylinder-to-cylinder variability, achieving improved engine performance and reduced emissions. In-cycle fuel and intake charge control techniques are also being developed to enhance the robustness of engine operation [7][8][9]. However, the more unstable nature of LTC compared to conventional diesel combustion adds further complexity to maintaining tight control over the engine operating mode.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

McTaggart-Cowan

Cong

Garner

et al. 2012

Journal of Engineering for Gas Turbines and Power

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This work elucidated which engine operating parameters have the greatest influence on Low temperature diesel combustion (LTC) and emissions. Key parameters were selected and evaluated at low and intermediate speed and load conditions using fractional factorial and Taguchi orthogonal experimental designs. The variations investigated were: about ± 5% in EGR rate, fuel injection quantity and engine speed respectively; and ± we in intake charge temperature. The half-fractional factorial results showed that the interactions among these parameters were negligible for a specific load/speed point. The Taguchi orthogonal method could be used as an efficient DoE tool for studying the multi-parameter 'small-scale transients' that a diesel engine would be likely to encounter when operating in LTC modes. LTC showed the most significant sensitivity to EGR rate variations, where an increase from 60% to 63% in EGR rate doubted THC and CO emissions and reduced combustion stability. LTC was also sensitive to the fuel injection quantity with an increase in injected mass lowering the overall oxygen-fuel ratio and thereby increasing THC and CO emissions. These two parameters influenced the oxygen concentration in the intake charge; which was identified to be a decisive parameter for the LTC combustion and emissions. Intake charge temperature affected the total charge quantity trapped in the cylinder and showed noticeable influence on CO emissions for the low speed intermediate load condition. Variations in engine speed showed a negligible influence on the LTC combustion processes and emissions.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

McTaggart-Cowan

Cong

Garner

et al. 2012

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

show abstract

“…The equations are under the assumption that the temperature of which the dynamics is relatively slow is not changed in same operating points. Vx Puc = Rr (I:�ir + Td t � P egr -��) (3) v"c Pdt = Ry (I:W; -T dtWLPegr -I:ut�ut) (4) Vdt where rand R are the specific ratio and ideal gas constant, respectively. Note that DPF is not contained in the after-treatment systems of this system so we assume the pressure drop through the after-treatment system in LP-EGR loop is negligible stated as pdJ '" P DOC .…”

Section: B Pressure Dynamicsmentioning

confidence: 99%

“…These states can be easily measured or estimated using sensors equipped on the production engine such as manifold absolute pressure (MAP) and mass air flow (MAF) sensors. By controlling Pi ' Px and simultaneously, it is possible to manipulate HP EGR flow and VGT flow properly to meet the emission goals [4][5] [7]. If w air is precisely controlled, we can adjust not only the LP EGR rate but also the total EGR rate.…”

Section: Introductionmentioning

confidence: 99%

Pressure and flow based control of a turbocharged diesel engine air-path system equipped with dual-loop EGR and VGT

Kim

Jin

Choi

2014

2014 American Control Conference

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This paper describes a pressure and flow based control method of diesel engine air-path systems equipped with dual-loop exhaust gas recirculation (EGR) and variable geometry turbine (VGT). For the control of dual-loop EGR systems, fraction states are usually controlled, but how to select the control outputs is still controversial. In this paper, considering availability and reliability of sensors, pressure and mass flow states are selected as control targets instead of fraction states. A robust nonlinear control method, input-output linearization is applied for the states of intake manifold pressure, exhaust manifold pressure, and fresh air mass flow rate in order to satisfy the target emissions. The control performance is verified by simulation based on the valid model of a heavy-duty 6000cc engine air-path.

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“…Neglecting the heat losses through the manifold walls and considering the air as an ideal gas with constant specific heats, the differential equation of the intake pressure is computed using the principle of the energy conservation and the ideal gas' state equation: (2) , , and are, respectively, the pressure, the volume, and the temperature of the air in the intake manifold, is the mass constant of the ideal gas, is the ratio of the heat capacities at constant volume and pressure, is the compressor air mass flow rate, is the air mass flow rate entering the engine, and is the temperature of the air exiting the cooling water heat exchanger. is given by (3) is the theoretical air mass flow rate capable of filling the cylinders volume at the pressure and temperature conditions of the intake manifold (4) is the total number of cylinders, is the displacement of one cylinder, is the engine angular speed, and is the volumetric efficiency expressed by the semi-empirical equation (5) where are constants identified from experimental data.…”

Section: A Intake Manifoldmentioning

confidence: 99%

Optimal Control of a Variable Geometry Turbocharged Diesel Engine Using Neural Networks: Applications on the ETC Test Cycle

Omran

Younès

Champoussin

2009

IEEE Trans. Contr. Syst. Technol.

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Modern diesel engines are typically equipped with variable geometry turbo-compressor, exhaust gas recirculation (EGR) system, common rail injection system, and post-treatment devices in order to increase their power while respecting the emissions standards. Consequently, the control of diesel engines has become a difficult task involving five to ten control variables that interact with each other and that are highly nonlinear. Actually, the control schemes of the engines are all based on static lookup tables identified on test-benches; the values of the control variables are interpolated using these tables and then, they are corrected, online, by using the control techniques in order to obtain better engine's response under dynamic conditions. In this paper, we are interested in developing a mathematical optimization process that search for the optimal control schemes of the diesel engines under static and dynamic conditions. First, we suggest modeling a turbocharged diesel engine and its opacity using the mean value model which requires limited experiments; the model's simulations are in excellent agreement with the experimental data. Then the created model is integrated in a dynamic optimization process based on the Broyden-Fletcher-Goldfarb-Shanno (BFGS) algorithm. The optimization results show the reduction of the opacity while enhancing the engine's effective power. Finally, we proposed a practical control technique based on the neural networks in order to apply these control schemes online to the engine. The neural controller is integrated into the engine's simulations and is used to control the engine in real time on the European transient cycle (ETC). The results confirm the validity of the neural controller.Index Terms-Diesel engines, dynamic optimization process, mean value model, optimal control and neural networks.

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Coordinated EGR-VGT Control for Diesel Engines: an Experimental Comparison

Cited by 39 publications

References 12 publications

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

Experimental Study of Low Temperature Diesel Combustion Sensitivity to Engine Operating Parameters

Pressure and flow based control of a turbocharged diesel engine air-path system equipped with dual-loop EGR and VGT

Optimal Control of a Variable Geometry Turbocharged Diesel Engine Using Neural Networks: Applications on the ETC Test Cycle

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