Week-4 Challenge WOT Condition Part-2

Question.No.1:What is the difference between mapped and dynamic model of engine, motor and generator? How can you change model type?

Mapped model:

mapped model are used when the behavior charecteristics of a particular model is not of our interest and can be modeled with pre defined values in the form of lookup table.

eg:mapped motor

in the below model values are taken from experiments or old data

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:
in the below model, motor components such as inverter, phase controller, feedback circuits are also modeled.

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Question.No.2:How does the model calculate miles per gallon? Which factors are considered to model fuel flow?

Simulink block to calculate miles per gallon.

• 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.

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