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Rojer, Chepa
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Experimental Validation of a Dynamic Waste Heat Recovery System Model for Control Purposes

DAF Trucks-Jeroen Smits
TNO Automotive-Frank Kupper, Chepa Rojer, Xander Seykens, Fabio Scappin, Frank Willems
Published 2013-04-08 by SAE International in United States
This paper presents the identification and validation of a dynamic Waste Heat Recovery (WHR) system model. Driven by upcoming CO₂ emission targets and increasing fuel costs, engine exhaust gas heat utilization has recently attracted much attention to improve fuel efficiency, especially for heavy-duty automotive applications.In this study, we focus on a Euro-VI heavy-duty diesel engine, which is equipped with a Waste Heat Recovery system based on an Organic Rankine Cycle. The applied model, which combines first principle modeling with stationary component models, covers the two-phase flow behavior and the effect of control inputs. Furthermore, it describes the interaction with the engine on both gas and drivetrain side.Using engine dynamometer measurements, an optimal fit of unknown model parameters is determined for stationary operating points. From model validation, it is concluded that the identified model shows good accuracy in steady-state and can reasonably capture the most important dynamics over a wide range of operating conditions. The resulting real-time model is suitable for model-based control.
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Virtual Exhaust Line for Model-based Diesel Aftertreatment Development

TNO Automotive-Robert Cloudt, Jan Saenen, Edwin van den Eijnden, Chepa Rojer
Published 2010-04-12 by SAE International in United States
A virtual diesel aftertreatment exhaust line is presented comprising DOC, DPF, SCR models and a unique Ammonia Oxidation catalyst model. All models are one dimensional models based on first principles. These models offer an attractive compromise between speed, accuracy and complexity for a variety of model applications: off-line simulation, control strategy development, Hardware in the Loop applications and model-based calibration. The implemented models are fast and suitable for real-time applications. Use of these virtual exhaust line models in a product development process has the potential of saving time and resources. The aftertreatment models are fitted based on specifically designed engine dynamometer experiments, which can be performed in a limited time frame. The effective test time required on a validated test setup is estimated on the order of 12 days in total. Specifically developed software tools facilitate the model fit process. These dedicated fit tools autonomously find parameter estimates for all the aftertreatment models. Isolated catalyst models and the complete virtual exhaust line show good correlation to measurements from a heavy-duty test setup. This work has…
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