GT-POWER Real-Time Diesel enginemodelfor Hardware in the Loop testing
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1 GT-POWER Real-Time Diesel enginemodelfor Hardware in the Loop testing GT-SUITE Conference 2009 David Willermark, SEMCON Niklas Smith, Volvo Car Corporation
2 Contents Project background Introduction to Mean Value/RT modeling Model details and results Introduction to Hardware in the Loop (HiL) HiL implementation Summary
3 Project background Volvo Volvo Cars Cars initiated initiated aa project project to to evaluate evaluate aa GT-POWER GT-POWER Real-Time Real-Time engine engine model model for for Hardware Hardware in in the the Loop Loop application application Semcon Semcon Gothenburg Gothenburg was was involved involved to to develop develop the the engine engine model model The The new new Volvo Volvo 5-cyl, 5-cyl, two two stage stage turbo, turbo, Euro5 Euro5 diesel diesel engine engine was was chosen chosen for for this this study study
4 Mean Value/RT modelling general description The main purpose of a Mean Value model is to increase simulation speed Derived from a detailed GT-POWER model Provides cycle averaged data Semi predictive Neural networks -trained by data either from the detailed model or engine test The RT model is created from the MeanValuemodel and should give identical results
5 Model conversion Detailed model Mean value model Inlet manifold Cylinders Exhaust manifold Flow components are lumped together to larger volumes The cylinders are exchanged with a MeanValue cylinder which is controlled by neural networks
6 MeanValue model details Neural networks- trained with data from the detailed model - Volumetric efficiency -IMEP - Exhaust temperature -FMEP - Heat exchanger temperatures Detailed model DOE -number of points chosen according to the guidelines from Gamma Turbine efficiency adjustments necessary
7 Model results- Steady state Deviation MeanValue vs. detailed model in % Inlet manifold pressure Exhaust manifold pressure Most points are within 2% - acceptable agreement
8 Model results- Steady state Deviation MeanValue vs. detailed model in % Air massflow Exhaust manifold temperature Most points are within 2% - acceptable agreement
9 Transient results, NEDC
10 Introduction to HiL Engine control systems are getting more and more complex and a larger number of variants is required -Needfor earlydevelopmentof enginecontrolsoftware and hardware Hardware in the Loop (HiL) simulations -Testing of control system related hardware, for example the ECU, together with simulation models of its surrounding systems (engine, actuators, sensors, vehicle etc.) - Development and testing of system components before prototypes of the surroundings exist
11 HiL system overview HiL rig Simulink model Transmission Controls GT-RT model Runs on separate board ECU
12 HiL implementation The HiLtests wererunon a dspacerigwith a DS4505 boardfor the RT model Smooth and troublefree installation of the board No application related operating problems Most effort was spent on arranging the interface between engine model and vehicle model Testrunwith real ECU and vehiclemodelwasperformedwith satisfying results
13 Summary and conclusions The MeanValue/RT modelresultshaveacceptable agreementwith the detailed model in both steady state and in transient operation GT-power RealTime is a simple method to create good working engine models for HiL applications Consideringthe limitedworkeffort, the overall resultsare satisfying
14 Acknowledgements Iakovos Papadimitriou and Matt Warner at Gamma Technologies Sverker Hansson, Fredrik Ragnarsson, Jan Styffeand Peter Norin at Volvo Car Corporation Tino Schulze at dspace Contact:
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