Exhaust Gas Recirculation Control for Large Diesel Engines – Achievable Performance with SISO Design

Hansen, Jørn Bindslev; Blanke, Mogens; Niemann, Hans Henrik; Vejlgaard-Laursen, Morten

doi:10.3182/20130918-4-jp-3022.00011

Cited by 8 publications

(9 citation statements)

References 11 publications

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“…High fidelity simulation models of the airflow of a marine engine with high pressure EGR were presented in [30], [31] and [32]. SISO control methods for a linearized version of such a model were investigated in [33] where it was found difficult to achieve both performance and robustness. The high-fidelity model from [32] is used in Section VII for validation of the observer.…”

Section: Controlmentioning

confidence: 99%

Adaptive Observer for Nonlinearly Parameterized Hammerstein System With Sensor Delay—Applied to Ship Emissions Reduction

Nielsen¹,

Blanke

Eriksson

2018

IEEE Trans. Contr. Syst. Technol.

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Taking offspring in a problem of ship emission reduction by exhaust gas recirculation control for large diesel engines, an underlying generic estimation challenge is formulated as a problem of joint state and parameter estimation for a class of multiple-input single-output Hammerstein systems with first order dynamics, sensor delay and a bounded time-varying parameter in the nonlinear part. The paper suggests a novel scheme for this estimation problem that guarantees exponential convergence to an interval that depends on the sensitivity of the system. The system is allowed to be nonlinear parameterized and time dependent, which are characteristics of the industrial problem we study. The approach requires the input nonlinearity to be a sector nonlinearity in the time-varying parameter. Salient features of the approach include simplicity of design and implementation. The efficacy of the adaptive observer is shown on simulated cases, on tests with a large diesel engine on test bed and on tests with a container vessel.Index Terms-Nonlinear control systems, joint state and parameter observer, sensor delay.

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Section: Controlmentioning

confidence: 99%

Adaptive Observer for Nonlinearly Parameterized Hammerstein System With Sensor Delay—Applied to Ship Emissions Reduction

Nielsen¹,

Blanke

Eriksson

2018

IEEE Trans. Contr. Syst. Technol.

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“…Existing EGR feedback control is able to control O sr during steady operating conditions but suffers during loading transients. In (Hansen et al, 2013a) it was shown that the achievable performance with SISO feedback control is limited. A nonlinear controller with direct use of fuel flow and turbocharger speed signals where suggested in (Nielsen et al, 2015) but without thorough validation.…”

Section: Purposementioning

confidence: 99%

“…A high-fidelity mean-value engine model (MVEM) is used for validation of closed loop properties. Controller synthesis by linearizing a similar MVEM was investigated in (Hansen et al, 2013a) where it was shown difficult to achieve both performance and robustness. The MVEM model also served as a basis of a simpler control-oriented model in (Nielsen et al, 2017b).…”

Section: Egr System Modelsmentioning

confidence: 99%

Adaptive feedforward control of exhaust recirculation in large diesel engines

Nielsen

Blanke

Eriksson

et al. 2017

Control Engineering Practice

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Document Version Peer reviewed versionLink back to DTU Orbit Citation (APA): Nielsen, K. V., Blanke, M., Eriksson, L., & Vejlgaard-Laursen, M. (2017). Adaptive feedforward control of exhaust recirculation in large diesel engines. Control Engineering Practice, 65, 26-35. AbstractEnvironmental concern has led the International Maritime Organization to restrict NO x emissions from marine diesel engines. Exhaust gas recirculation (EGR) systems have been introduced in order to comply to the new standards. Traditional fixed-gain feedback methods are not able to control the EGR system adequately in engine loading transients so alternative methods are needed. This paper presents the design, convergence proofs and experimental validation of an adaptive feedforward controller that significantly improves the performance in loading transients. First the control concept is generalized to a class of first order Hammerstein systems with sensor delay and exponentially converging bounds of the control error are proven analytically. It is then shown how to apply the method to the EGR system of a two-stroke crosshead diesel engine. The controller is validated by closed loop simulation with a mean-value engine model, on an engine test bed and on a vessel operating at sea. A significant reduction of smoke formation during loading transients is observed both visually and with an opacity sensor.

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“…However, this feedback control, being based on an O s measurement with inherent sensor dynamics and measurement delay, is an essential limitation for performance. This becomes an issue when handling hard acceleration of the ship and in high sea conditions where waves have significant impact as a fluctuating load torque on the propeller shaft (Hansen et al, 2013a). In both these conditions the engine RPM controller adjusts the flow of fuel into the cylinders and thus changes the appropriate EGR flow.…”

Section: Introductionmentioning

confidence: 99%

“…Blanke and Andersen (1984), Hendricks (1986) and more recently in Theotokatos (2010) and Hansen et al (2013b) though only the latter includes an EGR system. Hansen et al (2013a) presented EGR control design with SISO methods and feed forward of the fuel index. The main issues were found to be parameter sensitivity and the dead time of the oxygen sensor.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Adaptive Control of Exhaust Gas Recirculation for Large Diesel Engines

2015

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A nonlinear adaptive controller is proposed for the exhaust gas recirculation system on large two-stroke diesel engines. The control design is based on a control oriented model of the nonlinear dynamics at hand that incorporates fuel flow and turbocharger speed changes as known disturbances to the exhaust gas recirculation. The paper provides proof of exponential stability for closed loop control of the model given. Difficulties in the system include that certain disturbance levels will make a desired setpoint in O 2 unreachable, for reasons of the physics of the system, and it is proven that the proposed control will make the system converge exponentially to the best achievable state. Simulation examples confirm convergence and good disturbance rejection over relevant operational ranges of the engine.

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Exhaust Gas Recirculation Control for Large Diesel Engines – Achievable Performance with SISO Design

Cited by 8 publications

References 11 publications

Adaptive Observer for Nonlinearly Parameterized Hammerstein System With Sensor Delay—Applied to Ship Emissions Reduction

Adaptive Observer for Nonlinearly Parameterized Hammerstein System With Sensor Delay—Applied to Ship Emissions Reduction

Adaptive feedforward control of exhaust recirculation in large diesel engines

Nonlinear Adaptive Control of Exhaust Gas Recirculation for Large Diesel Engines

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