Week-4 Challenge WOT Condition Part-2

1. What is the difference between mapped and dynamic model of engine, motor and generator? How can you change model type? 

Sol: 

MAPPED models:

Mapped models are used when the behavior of a particular model is not of our interest and can be modeled with predefined values in the form of lookup tables.

eg: mapped motor

Implements a mapped motor and drive electronics operating in torque control mode. we have to specify electrical torque range with a torque-speed envelope or maximum motor power and torque. Output torque tracks a torque reference demand and includes a motor and drive response time constant. Also have to Specify electrical losses as a single operating point that estimates loss across the operating range, measured loss, or measured efficiency.

DYNAMIC model:

Dynamic models are used when the internal response to a model with respect to its components is needed.

eg: motor model

CHANGING the model type in EV powertrain blocks: we can use the variant manager in the modeling tab to find the variant systems we have right-click on the model you want and use set as Label mode active choice.

2. How does the model calculate miles per gallon? Which factors are considered to model fuel flow? 

Sol: 

• vehicle speed data is used to calculate the distance traveled in meters which is then converted to miles

• Battery power data is used to find power used in kWh which is then converted to gasoline-equivalent using US EPA value by dividing with 33.7
• note: As per the US environmental protection agency (EPA) 1 gallon of gasoline is equal to 33.7 kWh • Dividing distance traveled in miles by the number of gallons, we can get miles per gallon.
• For HEV this gallon(gasoline-equivalent of battery power) is added with gallon used by IC engine then miles per gallon is calculated.