Challenge

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?

Solution:

Mapped and dynamic model of motor and generator:

The above figure denotes the mapped and dynamic model of generator and motor.

Mapped Model:

Dynamic Model:

Changing model type:

To change in model type of generator rightclick on generator then select variant and select label mode active choice and select model type.
To change in model type of motor rightclick on generator then select variant and select label mode active choice and select model type.

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

Solution:

Here the model is taken as HEV reference application.

Miles per gallon gasoline equivalent is a measure of the average distance traveled per unit of energy consumed.
The miles per gallon is calculated by considering the battery output, Fuel output and speed of vehicle in kilometers driven.
Battery power is divived by 1000 to convert W per KW, after that we convert the energy from KWh to USgallon equivalent energy by dividing it by 33.7 of automotive gasolone.
Then by dividing with 3600 to convert hour to seconds, we get energy of equivalent LISgallons per seconds.
Then this is taken as feed back to fuel flow and now integrating this will give the mass of fuel and then we can multiply by 1000 to get in litres.
Now to calculate miles per gallon all inputs(distance, vehicle speed) are taken into consideration then converts into miles by multiplying with 0.00621371.
Now the inputs(battery power, fuel flow) are taken and then converts into equivalent US gallons by multiplying with 264.172.
Then further by dividing US gallons and multiplying miles we get the results as miles per gallons.

3) Run the HEV ReferenceApplication with WOT drive cycle. Change the grade and wind velocity in the environment block. Comment on the results.

Solution:

Here i have taken HEV multimode reference application. so we will see this application with and without changing the grade and wind velocity in environment block.

Hybrid Electric Vehicle Multimode Reference Application:

HEV ReferenceApplication with WOT drive cycle and without changing the environment block:

we should change the drive cycle to wide open throttle as shown below

Then we should open the environment block and see that no change is to be done for grade and wind velocity .

Now run the simulation to see the results.

The vehicle attains a speed of 89.5 mph with the acceleration time of 55 sec.
The state of charge at start of simulaton is 80 and reduces to 68.7 by the end of accelaration period.
The motor speed of the vehicle during the acceleration period is noted as 4932 rpm.
The maximum fuel used during the vehicle simulation is 13.5.

HEV ReferenceApplication with WOT drive cycle and changing the environment block:

After changing the grade and wind velocity in environment block we should simulate the results and analyze it.

After changing the vehicle attains a speed of 82.2 mph with an acceleration time of 55 sec.
The state of charge at the start is similar as previous but by the end of acceleraton time the state of charge is 59.8.
The maximum fuel used by the vehicle in this process is 8.8.
The motor speed during the acceleraton reches maximum to 100000 RPM.

Analysing Both in Tabular Form :

Parameters	with out change in environment block	with change in environment block
Grade	0	5
Wind velocity	0	10
Top speed	89.5 mph	82.2 mph
Acceleration time	55sec	55 sec
Deceleration time	5.05 sec	4.34 sec
Intial soc	80	80
Soc at the end of acceleration	68.7	59.8
Soc at the end of simulation	79	71.3
Maximum Fuel economy	13.5	8.8
Max battery current	523.7 amp	527.8 amp

4) Keeping all other parameters same, compare the simulated results of hybrid and pure electric powertrains.

Solution:

Pure EV ReferenceApplication with WOT drive cycle and without changing the environment block:

The vehicle attains a speed of 88.9 mph with the acceleration time of 55 sec.
The state of charge at start of simulaton is 80 and reduces to 76.4 by the end of accelaration period.
The motor speed of the vehicle during the acceleration period is noted as 9269 rpm.
The maximum fuel used during the vehicle simulation is 55.4.

Pure EV ReferenceApplication with WOT drive cycle and changing the environment block:

After changing the vehicle attains a speed of 73.3 mph with an acceleration time of 55 sec.
The state of charge at start of simulaton is 80 and reduces to 74.9 by the end of accelaration period.
The maximum fuel used by the vehicle in this process is 27.6.
The motor speed during the acceleraton reches maximum to 7494 RPM.

Analysing in Tabular Form :

Parameters	with out change in environment block(HEV)	with out change in environment block(EV)	with change in environment block(HEV)	with change in environment block(EV)
Grade	0	0	5	5
Wind velocity	0	0	10	10
Top speed	89.5 mph	88.9 mph	82.2 mph	73.3 mph
Acceleration time	55sec	55 sec	55 sec	55 sec
Deceleration time	5.05 sec	8.38 sec	4.34 sec	5.76 sec
Intial soc	80	80	80	80
Soc at the end of acceleration	68.7	76.4	59.8	74.9
Soc at the end of simulation	79	76.8	71.3	75.2
Maximum Fuel economy	13.5	55.4	8.8	27.6
Max battery current	523.7 amp	223.5 amp	527.8 amp	224.8 amp

Ship work like this
in your own course.