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?
2. How does the model calculate miles per gallon? Which factors are considered to model fuel flow?
3. Run the HEV ReferenceApplication with WOT drive cycle. Change the grade and wind velocity in the environment block. Comment on the results.
4. Keeping all other parameters same, compare the simulated results of hybrid and pure electric powertrains.

Q1)

Mapped model :- It is static model which is use to show the results on the basic of data which is input by calculated values

A mapped system refer to one where the performance characteristics of either engine , Generator or Motor are plotted in the model using the mapped data given in the lookup table

Dynamic model:- It is the model which is shows result on the basic of actual reading taken in system

A dynamic system is one in which the running of the motor generator or Engine is simulated in real time and detailed parameter affecting the motor performance can be modified and the results performance characteristic can be use in simulation

For changing the Model

• Click on help
• Search getting started with powertrain blockset
• Open the Simulink model then click on modeling
• Go to variant manager<electric reference application < passenger car<electric plant < motors select which model to run

Q2)

• Vehicle speed in meter which is converted into miles
• Battery data in KWh which is converted into gasoline equalent using US EPA value by dividing with 33.7
• 1 gallon = 33.7KWH
• By dividing distance travel in miles by no of gallons then we get miles per gallon
• For HEV this gallon is added with gallon use by IC engine then miles per gallon calculate

Q2 B)

As we can see from above block the battery power input signal is converted into an equalent miles per gallon this is along with the value of distance cover from vehicle speed is used to calculate the efficiency of the drive cycle

Q3)

Wide open throttle Simulink block

Visualization blockset

No change in Grade and another parameter

By changing the grade values to 5

By changing the environmental factor of HEV

• Attained velocity is lower
• Motor RPM is light be higher but engine RPM remain same
• Fuel economy reduce drastically
• SOC is maintain same in both change

Q3B) keeping all the parameter same for HEV and EV

Simulation block of HEV with WOT for 40 sec

Visualization result graph of HEV

EV blockset with WOT for 40 sec

Visualization Result graph

Result:-

• Battery discharge is different because of in HEV motor is charge the battery but in HV regenerative breaking system charge the battery
• Motor speed is high in HEV as compare to EV
• EV powertrain provided a better MPH rating as it is more efficient
• Torque provided in HV