Hybrid and Electric Vehicle Modeling
Hybrids, Electrics and their Control Systems
See the Hybrid and Electric Vehicle Brochure (PDF)
GT-SUITE offers a versatile set of tools for the simulation of vehicles with Hybrid-Electric
(HEV) or Electric-only (EV) drivelines, as well as the control systems and control strategies
that are key to the operation of these vehicles. A set of HEV components (electromechanical
and energy storage devices) are provided and can be combined with Vehicle, Engine,
Electrical and Control libraries to create comprehensive and integrated models of HEV or EV
vehicles and drivelines. Such models are indispensible in studies aimed at selection of
components, and selection, evaluation, fine-tuning and optimization of control strategies
to achieve set design goals, typically fuel economy, emissions and performance for various
duty cycles.
The following are the key elements of GT-SUITE which enable modeling of HEV drivelines
• Electromechanical component models (motor, generator)
• Energy storage (battery)
• Electrical (circuit) modeling elements
• Control/signal processing library
• Torque-splitting devices (e.g. planetary gear)
Together, these allow modeling of virtually any HEV driveline configuration (series,
parallel, power-split or combinations) as well as electric vehicles. HEV driveline models can
model in full detail the master "strategy" controller as well individual device controllers, to
simultaneously apply strategies for all common HEV functions:
• Electric launch and transition to IC engine drive
• Regenerative braking, braking load distribution (mechanical vs. electrical)
• IC engine assist and efficient operation for best fuel economy
• Battery state of charge maintenance
• Charge-depleting driving in PHEVs and transition to traditional charge-sustaining HEV
strategy
• Interactions, interdependences and interlocks between the above
GT-SUITE provides both map-based and simplified "electro-mechanical" models of a
motor or generator. In the map-based model, a torque (or mechanical or electrical power)
map is user-specified as a function of speed and an "actuator". In the electro-mechanical
model the device is "driven" with an applied voltage and a simple circuit is solved for. The
back-voltage is a function of rotor speed through a multiplier, which by energy conservation
principles is also the ratio of torque to current. The multiplier can be made variable, for
example specified as a map/function of speed and current. A third alternative is the
construction of detailed electro-mechanical models using basic mechanical and electrical
primitives. This enables integration of any external circuit models (e.g. for controller, inverter
circuits) which control applied voltages to be included in the simulation.
There are several battery models. One is based on a simple circuit and is controlled by
power request. The battery open circuit voltage, internal resistance, as well as a Columbic
efficiency can be specified as a function of battery state of charge (SOC) and temperature, all
separately for charging and discharging. The model solves for the current and integrates
SOC. A thermal model based on stacked cylindrical cells can be activated by the user
to model mean battery temperature, and an interface to a user thermal model is also
provided. Electrical and thermal libraries may also be used together to construct a battery
model which can be integrated with models of external circuits
Product Highlights:
- Handles ANY hybrid configuration and control strategy
- Contains Full vehicle, driveline model, plus HEVcomponents
Energy Mangement:
- Dedicated controllers are provided for control of IC engine, battery, electric machines and brakes.
Their use greatly simplifies hybrid model building - The “brain” of the HEV control is a central controller which contains the strategy for the overall power distribution and energy management (strategy can be usercoded)
- Evaluation of HEV and PHEV fuel economy by EPA and SAE standards
- Optimization of control strategy for fuel economy and emissions
- System-level or detailed-level (circuit) modeling of Electric Machines and Batteries
- Evaluation, design and optimization of hybrid vehicle as a system, through integrated simulation of systems and energy management
- Complete vehicle energy management studies incorporating multiple subsystems
- Study various degrees of hybridization and their relative and overall effect on fuel economy
- Vehicle electrical system and additional batteryloads
- Thermal management, battery or electric machine cooling
- Incorporation of separate control strategies during engine warm-up
- Smart “Event manager” for event-based setup of dynamic duty cycles with complex interdependent segments
 For more information contact:(or contact us online) |
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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 Systems
AC and Rankine
Lubrication and bearings
Fuel Injection
Valvetrain, camshaft
Cranktrain, crankshaft
Chain, gear, belt drive