Vehicle and Driveline Simulation

Vehicle and Driveline Dynamics, Drive Cycles

GT-SUITE offers a versatile toolbox for modeling vehicles and drivelines and simulation of vehicle dynamics.   Vehicle models can be used to address the following vehicle engineering issues:

• Vehicle performance, acceleration, stopping, grade ability, passing etc.
• Fuel economy and emissions for drive cycles or real missions
• Driveline torsional vibrations, driveability
• Engine/powertrain control system and strategy evaluation and optimization

For modeling drive cycles controllers may be used to follow the cycle or event schedule in a conventional dynamic analysis.   Optionally a special “backward-facing”, or kinematic mode may be used, which imposes vehicle speed and runs many times faster than real-time.   Vehicle models in GT-SUITE are also commonly integrated with models of engine Performance and vehicle Thermal Management and in GT-SUITE Real-Time.   A vehicle and driveline model may be paired with each of the three engine models available in GT-SUITE:

• A highly flexible and fast-running map-based engine model
• A “mean-value” engine model (map-based cylinders, with intake/exhaust flow and turbocharger modeling)
• Full, detailed GT-SUITE engine (GT-POWER), including cylinder combustion, flow, thermal etc. submodels)

Another application of vehicle and driveline models in GT-SUITE is the modeling of Hybrid-electric Vehicle (HEV) drivelines and HEV control strategies.   Models of HEV driveline electromechanical and energy storage components can be combined with standard vehicle dynamics toolbox elements to create models of HEV (or EV) driveline configurations.

The following describes key elements of the GT-SUITE Vehicle Dynamics toolbox:

• Engine:   map-based (general maps w/ scattered data) or higher-level models.
• Torque converter:   capacity factor/coeff. of perf., torque ratio, lockup clutch
• Clutch:   actuator, max. torque; “bristle” friction-based model, lockup
• Transmission:   discrete or CVT, inertias, efficiency, friction, shift strategies
• Driveshaft:   rigid or flexible
• Differential, transfer case:   Ratios, inertia, efficiency,friction
• Planetary:   ratios, inertias, friction
• Axles:   Inertias, friction
• Brakes:   actuator, torque map or friction-based model (like clutch)
• Vehicle:   drag, lift , suspension and load distribution to axles
• Tire:   radius, rolling resistance, rigid or slipping tire (traction) model
• Road:   variable grade or elevation, curvature, rolling resistance and traction
• Vehicle Driver:   accelerator, brake, shift base controls plus driveaway and shifting behavior
• Model-based Vehicle Controller:   High fidelity control of vehicle speed or acceleration, without CPU time burden of PIDs
• Event Manager:   user-friendly time, distance or event-based scheduling of successive driving events

All of the above are designed to be highly versatile, allowing the user to dynamically modify (actuate) virtually all properties (e.g. differential efficiency, engine map multipliers, effective tire radius, traction modifier etc) through the use of the GT-SUITE Control/Signal Processing toolbox.

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For more information contact: (or contact us online)
Gamma Technologies, Inc.  601 Oakmont Lane, Suite 220  Westmont, IL 60559  USA	Tel.   (630) 325-5848  (630) 325-5848   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 Systems

VTM
Underhood Modules

AC and Rankine
Lubrication and bearings
Fuel Injection
Valvetrain, camshaft
Cranktrain, crankshaft
Chain, gear, belt drive