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Model-Based Exhaust Pressure Control with Dynamic Feedforward for Engine Protection
Technical Paper
2014-01-1163
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The need to reduce fuel consumption and harmful pollutants from engines is an important task for automotive industry. It has led to technological advances in new engine design, such as engine downsizing. Due to the reduction of displacement, engine power output is reduced and thus its overall performance is limited. In order to increase torque and power, engines are typically boosted by turbochargers or superchargers. Meanwhile, the improvement on turbo design makes it possible to operate VGT (variable geometry turbocharger) at harsher exhaust environment for gasoline engines as well (e.g., with much higher exhaust temperature than that of diesel engines). This makes VGT related control problems more challenging and requires attention to protecting corresponding engine hardware during an entire engine life.
In this paper we investigate a new model-based engine control feature, which controls engine exhaust pressure in order to protect engine, turbocharger and aftertreatment catalyst devices. The methodology inverts a physics-based model from VGT valve position to engine exhaust pressure to design a model-based feedforward controller to be combined with conventional PID feedback control. The model-based control system makes the actual engine exhaust pressure track the target in fast transients under varying operating environments, such as changes in exhaust temperature and pressure with exhaust pipe restrictions. Dynamic compensation is also introduced to compensate for both transport delay for air flow and combustion delay for the mixture of air and fuel in engine exhaust flow estimation to improve control responses. The exhaust pressure control is seamlessly integrated with the boost pressure control to maintain smooth transitions between the two control systems, which is illustrated through detailed simulation analysis. Similar algorithm can be extended to a wastegated system.
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Wang, Y., Zhu, Y., and Haskara, I., "Model-Based Exhaust Pressure Control with Dynamic Feedforward for Engine Protection," SAE Technical Paper 2014-01-1163, 2014, https://doi.org/10.4271/2014-01-1163.Also In
References
- Jankovic , M. , Jankovic , M. and Kolmanovsky , I. Constructive Lyapunov Control Design for Turbocharged Diesel Engines IEEE Transactions on Control Systems Technology 8 2 March 2000
- Dekker , H. and Sturm , W. Simulation and Control of a HD Diesel Engine Equipped with New EGR Technology SAE Technical Paper 960871 1996 10.4271/960871
- Kolmanovsky , I. , Moraal , P. , Nieuwstadt , M. van and Stefanopoulou , A. Issues in Modeling and Control of Intake Flow in Variable Geometry Turbocharged Engines Proc. 18 th IFIP Conf. Syst. Modeling Optimization Detroit, MI July 1997
- Wahlström , J. , Eriksson , L. and Nielsen , L. EGR-VGT Control and Tuning for Pumping Work Minimization and Emission Control IEEE Transactions on Control Systems Technology 18 4 July 2010
- Wang , Y. and Haskara , I. Exhaust Pressure Estimation and Its Application to Detection and Isolation of Turbocharger System Faults for Internal Combustion Engines ASME Journal of Dynamic Systems, Measurement and Control 2011
- Flärdh , O. and Mårtensson , J. Nonlinear Exhaust Pressure Control of an SI Engine with VGT Using Partial Model Inversion 49 th IEEE Conference on Decision and Control Atlanta, GA, USA December 2010
- Ammann , M. , Fekete , N. , Guzzella , L. , and Glattfelder , A. Model-Based Control of the VGT and EGR in a Turbocharged Common-Rail Diesel Engine: Theory and Passenger Car Implementation SAE Technical Paper 2003-01-0357 2003 10.4271/2003-01-0357
- Black , J. , Eastwood , P. , Tufail , K. , Winstanley , T. et al. The effect of VGT vane control on pumping losses during full-load transient operation of a common-rail diesel engine SAE Technical Paper 2007-24-0063 2007 10.4271/2007-24-0063
- Ahmad , N. and Gajendra Babu , M. Simulation and Experimental Studies on Combustion and Performance Characteristics for a Turbocharged and Naturally Aspirated Multi-Cylinder Compression Ignition Engine SAE Technical Paper 2006-01-3487 2006 10.4271/2006-01-3487
- Sens , M. , Nickel , J. , Grigoriadis , P. , and Pucher , H. Influence of Sensors and Measurement System Configuration on Mapping and the Use of Turbochargers in the Vehicle SAE Technical Paper 2006-01-3391 2006 10.4271/2006-01-3391
- Rakopoulos , C. and Giakoumis , E. Review of Thermodynamic Diesel Engine Simulations under Transient Operating Conditions SAE Technical Paper 2006-01-0884 2006 10.4271/2006-01-0884
- Canova , M. , Fiorani , P. , Gambarotta , A. , and Tonetti , M. A Real-Time Model of a Small Turbocharged Multijet Diesel Engine: Application and Validation SAE Technical Paper 2005-24-065 2005 10.4271/2005-24-065