WOT Condition
Week 4 Challenge
Q1. What is the difference between mapped and dynamic model of engine, motor and generator? How can you change model type?
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Mapped Model |
Dynamic Model |
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Engine |
Mapping done using Look Up Table Steady State Operation is presented |
All details given for engine Transient conditions can be presented |
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Generator / Motor |
Data is available Based on Look up Table / Data Sheet Static Model Steady Set Operation is presented |
Actual Model Dynamic Model Transient operation is also presented Inverter model is presented |
The model can be changed using variant manager : -
Q2. How does the model calculate miles per gallon? Which factors are considered to model fuel flow?
Ans: Following factors are considered :
- Vehicle Speed : This is integrated to calculate the distance covered.
- Fuel Flow : This is integrated to get the net fuel used by vehicle
- Battery Power : The battery power consumed is converted to equivalent fuel per gallon and this is added to the net quantity of fuel consumed.
Q3. Run the HEV ReferenceApplication with WOT drive cycle. Change the grade and wind velocity in the environment block. Comment on the results.
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Case 1 : Wind Speed = 0 and Grade = 0 WOT : (0 - 50 Sec) |
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Time to achieve ref speed (67.1 mph) |
10.78 sec |
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Change in SOC |
80% to 73.2% (In 10.78 sec) |
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Peak Battery Current |
500 A |
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Engine |
Does not start as SOC is greater than 70% |
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Case 2 : Wind Speed = 0 and Grade = 10 WOT : (0 - 50 Sec) |
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Time to achieve ref speed (67.1 mph) |
29.75 sec |
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Change in SOC |
80% to 66% (In 29.75 sec) |
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Peak Battery Current |
500 A |
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Engine |
Starts at 12.5 sec when SOC drops below 70% |
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Case 3 : Wind Speed = 20 and Grade = 10 WOT : (0 - 50 Sec) |
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Time to achieve ref speed (67.1 mph) |
Cannot achieve the speed |
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Change in SOC |
80% to 57.8% (In 70 sec) |
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Peak Battery Current |
500 A |
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Engine |
Starts at 16.8 sec when SOC drops below 70% |
Q4. Keeping all other parameters same, compare the simulated results of hybrid and pure electric powertrains.
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Hybrid Model (FTP75 Driving Cycle) |
Electric Model (FTP75 Driving Cycle) |
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Time for maximum acceleration : 78.65 sec |
Time for maximum acceleration : 80.33 sec |
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SOC at end of cycle : 73.3 % |
SOC at end of cycle : 71.7 % |
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Maximum Motor Speed : 6744 RPM |
Maximum Motor Speed : 5852 RPM |
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Maximum Battery Current : 168 A |
Maximum Battery Current : 96 A |
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Maximum Motor Torque : 125 Nm |
Maximum Motor Torque : 106 Nm |
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Fuel Economy at end of cycle : 37 MPGe |
Fuel Economy at end of cycle : 185.2 MPGe |
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WOT (Time to achieve target 60 MPH) = 8.96 sec |
WOT (Time to achieve target 60 MPH) = 11 sec |
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Input : Driving Cycle, Temperature, Pressure Grade, Wind Speed |
Input : Driving Cycle, Temperature, Pressure Grade, Wind Speed |
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Output: Velocity, Motor Speed, Battery SOC, Battery Current, Motor Torque, Fuel Economy, Engine Speed, Engine Torque, Generator Speed, Generator Torque, TP HC Mass, TP CO Mass, TP Cox Mass, TP CO2 Mass |
Output: Velocity, Motor Speed, Battery SOC, Battery Current, Motor Torque, Fuel Economy |
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Electric Plant : Battery + Motor +Generator |
Electric Plant : Battery + Motor |
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Separate Engine Block |
No Engine |