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?

Ans: Mapped model

1) In mapped model data points are pre-assigned in lookup table which would be configured with the operational parts and the analysis would be formed

. 2) Model uses a set of steady-state lookup tables to characterize engine performance

3) The accuracy is low for this system.

4) Run time simulaion less time,because it does not run with real time simulation.

Dynamic model

• Dynamic engines decompose engine behavior into individual component models that account for engine dynamics, most notably intake airflow and turbocharger dynamics. You can switch between engine model types based on your application.

1)Dynamic model runs by real time simulator.

2) dynamic model uses the combination of ouput from various subsystem to generate output.

3) The accuracy of dynamic model is very high.

4) Run time simulation take more time.

Step to change moel:

1) select vehicle type power train blockset model.

2)Go to passenger block simulink model of electric motor and generator.

3) Right click on block and go to variance label mode active choice motorgen ev mapped or dynamic.

Que:2 How does the model calculated mile per gallon ? which factor are consider for model to fuel flow?

• Fuel flow Battery power are the things that to be considered to model fuel flow. 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.

Miles per gallon(MPG)

MPG is a fuel economy ratingdetermined by how far a car can travel on a gallon of gasoline or diesel . although the metric versiuon would be in kmper liters MPGT is adopted in many metric system countries, like canada UK.

While it is cheaper and better for the enviornment to achieve a higher MPG rating, there is a curve, that the EPA called the ''MPG illusion that so the cost benifitsof increasing MPG decreasewith higher RATING.

the graph above show MPG illusion

The model calculated the MPG& L/100km by considering the vehicle speed,fuel volume flow& battery power as input.

The input for the US MPG calculation are vehicle speedin miles & fuel flow volume in US gallon.

Factor that effect the fuel Economy:

1) Excessive short trip

2) Frequent cold weather travel

3)Havy braking ands acceleration

4) High speed weight and Towing weight

5)Speeding.

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

Ans:

" HEV Refrence Application"

The hybride electric vehicle refrence application represent t6o full multimode hybride electric vehicle (HEV) model with an internal combution engine ,transmission ,battery ,motor ,generator ,and associated powertrain control algorithms, uses the refrence application for powertrain matching analysis and component selection ,control and dignostics algoritham design and hardware - in -the - loop (HIL) testing .

by default, the multimode reference application is configured with :

• Mapped motor and generator
• 1.5-L spark-ignite (SI) dynamic engine

This diagram show the powertrain configuration .

Description:

1) Open HEV reference application model in MATLAB.

2) it consist of various subsystem which are simulate to EV refrence application but the complecty is more in '"HEV Reference Application'model

change the grade and velocity :

.

After that . i run the model for 50 sec we can see the picture below :

Result:

Performane and EF Scope:

As we can see in the above picture, in plot we applied WOT with applied with velocity within no time , the trace velocity remained 67.1m/h deacceleration. but as we can see the actual velocvity of did not reach the trace velocity because of gradibility and wind .

velocity has been incresed , the value of currunt and engine power is also limited , as we can see in second plot the currunt is going to negative after starting deaccelaration . this negative currunt means the battery is charging and the regenrative brake is applied , we can also see in plot the speed of the motor and generator is same and it overlap .

Que4: Keeping all other parameters same, compare the simulated results of hybrid and pure electric powertrain.

The hybrid electric vehicle reference application represents a full multimode hybrid electric vehicle (HEV) model with an internal combustion engine, transmission, battery, motor, generator, and associated powertrain control algorithms. Use the reference application for powertrain matching analysis and component selection, control and diagnostic algorithm design, and hardware-in-the-loop (HIL) testing. To create and open a working copy of the hybrid electric vehicle reference application project, enter

By default, the HEV multimode reference application is configured with:

This diagram shows the powertrain configuration.

This table describes the blocks and subsystems in the reference application, indicating which subsystems contain variants. To implement the model variants, the reference application uses variant subsystems.

Result: