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Foundation ::
CAD CAM CAE ::
HEVA
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HEVA
Hybrid Electric Vehicle Analysis
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Moderators:
Dale Stalnaker
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SOURCE CODE AVAILABLE
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HEVA (Hybrid Electric Vehicle Analysis) is a computer simulation for modeling the performance of an automotive vehicle, especially a hybrid vehicle. A hybrid is defined in this context as a vehicle driven by power supplied by an energy storage device (i.e. battery, flywheel or ultracapacitor) whose state-of-charge (SOC) is maintained by a heat engine which burns natural gas or another fuel. The energy storage system, in turn, provides electricity to a traction motor for propulsion. HEVA can model the performance of conventional non-hybrid vehicles, which lack any storage device. It also accounts for energy recovered by regenerative brakes. HEVA calculates fuel economy for a given vehicle design and operating conditions and estimates itemized power flow, wheel/motor moments, and energy storage system behavior. The algorithms used in HEVA assume that the only direct source for motive power is the electric motor. HEVA is not programmed to analyze hybrids designed with a parallel configuration, in which either an electric motor or a fuel-burning engine can propel the vehicle.
HEVA consists of the simulation program and nine file editors. The file editors are used to modify the various input files for specifying the vehicle s operating conditions, physical characteristics, engine, drive train, and energy storage system inputs. There are nine types of input files, each with a corresponding file editor. The input data stored in the various file types fall into the following categories:
- operating conditions (velocity profile, road inclination, environmental conditions)
- vehicle parameters (weight, aerodynamic characteristics, etc.)
- engine parameters (efficiency, power ratings, fuel characteristics)
- drive train efficiency (drive train efficiency vs. speed ratio)
- torque data (torque supplied by the motor vs. motor speed ratio)
- APU control parameters (adjusted APU power output vs. SOC)
- battery characteristics (open circuit voltage and resistance vs. SOC, rated voltage, amp-hr. capacity)
- flywheel characteristics
- capacitor characteristics (capacitance, efficiency, and maximum voltage)
To run a simulation case, one of each type of input file is selected to specify the scenario to be analyzed.
HEVA carries the NASA case number LEW-16632. It was originally released as part of the NASA COSMIC collection.
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