Week-4 Challenge WOT Condition Part-2

1]

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:

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.

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.

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2]

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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3]

 Open the HEV  reference application

Grade - 0,   wind velocity 0m/s

Grade - 5,   wind velocity 10m/s

Grade - 15,   wind velocity 30m/s

RESULTS:

with the increase in grade and wind velocity,

• peak velocity achieved is reduced as gradient force and aerodynamic force becomes dominant.
• fuel economy is also reduced because the distance traveled is reduced due to external forces.
• deceleration time is reduced so batter recharging capacity is also reduced.
• Battery SOC at the end of WOT acceleration is similar but during deceleration battery is charged more is the grade and wind velocity is less.

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4]

Simulation conditions:

simulation is done for 50 seconds and the 40 seconds WOT drive cycle is used with wot acceleration for  0-30 seconds achieving a max speed of 26.8m/s and decelerates for 10 seconds (30-40).

            

                

EV model powertrain configuration:

HEV p2 model:

HEV p2 model is chosen because the configuration is similar to our EV model

Simulink model:

Results:

1.EV model

2.HEV P2 Model