Week-4 Challenge WOT Condition Part-2
1. Difference Between Mapped and Dynamic Models for Engine, Motor, and Generator
2. How to Change Model Type?
You can change the model type in Powertrain Blockset using these steps:
1. Open the Simulink HEV Reference Application.
2. Navigate to Passenger Car > Electric Plant > Motor & Generator.
3. Change the parameter Model Type in the block settings.
Set it to Mapped for lookup table-based simulation.
Set it to Dynamic for physics-based modeling.
4. Apply the changes and simulate again.
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3. How Does the Model Calculate Miles Per Gallon (MPG)?
The model calculates MPG using the fuel consumption and distance traveled:
MPG = \frac{\text{Total Distance Traveled (miles)}}{\text{Total Fuel Consumed (gallons)}}
Factors Considered in Fuel Flow Modeling:
Engine Efficiency Maps (torque, speed, and fuel rate).
Driver Demand (Acceleration/Braking Behavior).
Vehicle Load (Aerodynamic Drag, Rolling Resistance, Road Grade).
Battery Contribution in Hybrid Vehicles.
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4. Running HEV Reference Application with WOT Drive Cycle
Steps to Modify Environment Block:
1. Open HEV ReferenceApplication in Simulink.
2. Set the drive cycle to WOT (Wide Open Throttle).
3. Navigate to Environment Block and modify:
Road Grade (%) → Increase or decrease to simulate uphill/downhill driving.
Wind Velocity (m/s) → Increase headwind or tailwind effects.
Observations:
Increasing Road Grade:
Increases fuel consumption and motor load.
Reduces acceleration and efficiency.
Adding Headwind:
Increases drag, causing higher power demand.
Reduces overall efficiency.
Adding Tailwind:
Reduces resistance, improving fuel efficiency.
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5. Comparison of Hybrid and Pure Electric Powertrains
Simulation Setup:
Keep all parameters the same (vehicle mass, drive cycle, environmental factors).
Compare HEV (Hybrid Electric Vehicle) vs. EV (Battery Electric Vehicle).
Simulation Results:
EVs have better efficiency and no emissions but require charging.
HEVs offer extended range and use regenerative braking to improve fuel
economy.