SiL, HiL and Real-Time Simulations
Fast Running SiL & HiL Engine Models based on Detailed GT-POWER Simulations
GT-SUITE provides the user with a host of tools and capabilities for performing a variety of control system design and analysis via both Software in the Loop (SiL) and Hardware in the Loop (HiL). At the heart of this capability is the Simulink interface, i.e. the ability to couple any GT-SUITE model to Matlab/Simulink through GTI's flexible application program interface (API). Through this interface, sensors and actuators may be placed within the GT-SUITE model, where the sensed values are passed from GT-SUITE to Simulink, and the actuated values are passed back from Simulink to GT-SUITE, and are used to modify or actuate GT-SUITE inputs (throttle angle, fuel rate or timing, EGR valve position, wastegate or VGT rack position are a few typical examples).
SiL simulations may be accomplished via the Simulink interface described above and may be accomplished with models that run faster or slower than real time. Running on HiL, however, requires a model to run at real time or faster. For GT-SUITE models that do not naturally run at real time or faster, GT-SUITE contains a sophisticated set of neural network (NN) training and modeling utilities that allow slower, more detailed engineering models to be reduced to a less detailed, faster running model capable of meeting the RT requirement. Within GT-POWER, for example, the engine cylinder models are replaced with a NN representation that is used to predict the cylinder power, airflow, and exhaust temperature.
GT-SUITE's built in design of experiments tool and distributed running facility make generation of the data required to train the NN's a rapid and highly automated process. The models for the breathing system (manifolds, turbochargers, throttles, etc.) remain in the physical modeling domain, providing for predictive capturing of those systems in terms of throttle response, turbo lag, etc. In this manner, the hybrid (part neural net, part physical) model will run faster than real time, and still provide a high level of predictive capability.
Once the RT capable model is ready, a special, highly optimized version of the GT-SUITE library compiled specifically for HiLs is available. This highly optimized library contains all of the elements of the standard
GT-SUITE solver that are needed for typical HiL simulation, while eliminating much of the computational overhead associated with high level models that are not applicable to real time applications, thus enabling
outstanding runtime performance and the right level of detail for such applications.
GT-SUITE operates on a variety of HiL vendor hardware, to ensure maximum compatibility with the customer's HiL solutions. We currently support running GT-SUITE on HiLs from ETAS, dSpace, Opal-RT, A&D, Mathworks, Cybermetrics, National Instruments and Real Time Technologies.
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| Gamma Technologies, Inc. 601 Oakmont Lane, Suite 220 Westmont, IL 60559 USA |
Tel. Fax. (630) 325-5849 Email:CAE@gtisoft.com Web:www.gtisoft.com |
APPLICATIONS
Engine Performance
Test Pressure Analysis
Exhaust Aftertreatment
Acoustics
SiL, HiL, real-time
Vehicle, driveline
Hybrid Vehicles
Cooling/VTM
Underhood Modules
AC and Rankine
Lubrication and bearings
Fuel Injection
Hydraulics, pneumatics
Valvetrain, camshaft
Cranktrain, crankshaft
Chain, gear, belt drive