Week-4 Challenge WOT Condition Part-2
- What is the difference between mapped and dynamic model of engine, motor and generator? How can you change model type?
A. The difference between mapped and dynamic model is :
1.For the mapped model If we have the motor related data.that data can be mapped in the particular file and we can run the simulation with available data. The static model is going to work faster and it run based on the data given in the lookup table.
2.The Dynamic data is the actual data and represents the actual components of the model.
Change model type:
Click on the matlab - type the power train block set in the help section- Click on the electric vehicle reference application-file are downloaded and give them the path- Simulinkmodel of the EV reference application is opened-in that Click on the passenger car - In that click on the electrical plant and drive train.
Click on the electrical plant- In this block the battery Ev - Motor Generator mapped and the motor generator Dynamic are present.
From this block we can switch between the motor generator mapped -static model. and the motor generator dynamic model- open the actual motor and the motor control. The screen shots of the model is submitted.
2.How does the model calculate miles per gallon? Which factors are considered to model fuel flow?
A. Click on the matlab - type the power train block set in the help section- Click on the electric vehicle reference application-file are downloaded and give them the path- Simulinkmodel of the EV reference application is opened.
Click on the run icon for the simulation. After the simulation the results are seen in the performance and FE Scope .In this scope the waveforms of the drive cycle ,Battery state of charge(SOC), Motor generator, Torque ,Fuel ( Miles per gallon(MPG). For the pure electric vehicle the fuel is not used .it is a comparision how much the miles per gallon is used. Incase of EV the above 100 miles per gallon. The calculation is done by the cursor by the trace selection.
Click on the matlab - type the power train block set in the help section- Click on the Hybrid electric vehicle reference application-file are downloaded and give them the path- Simulinkmodel of the HEV reference application is opened.
Whether the vehicle is of Hybrid Electric Vehicle(HEV) The miles per gallon is drop, because the engine is running . The engine efficiency is lower when compared with the motor and generator these are the factors. The fuel of the miles per gallon is calculated by selecting the Trace selection of Fuel Economy MPGe. The value is calculated by selecting the cursor in the waveform. The output of the value is 7.2MPG(mile per gallon).
The output waveform of the Electric Vehicle and the HEV is Submitted.
3.Run the HEV ReferenceApplication with WOT drive cycle. Change the grade and wind velocity in the environment block. Comment on the results.
A.1. Click on the matlab - type the power train block set in the help section- Click on the Hybrid electric vehicle reference application-file are downloaded and give them the path- Simulinkmodel of the HEV reference application is opened.
2. Click on the environment and click on the grade and type in the constant block 7 and wind velocity and type in the constant block as 1..
3.Click on the drive cycle and select the WOT model. Set the value said by the model lecture.
4. Click on the sample time and set as 100 seconds. and click on the run icon.
5. The output of the waveform are seen in the Performance and FE Scope.
6. In the output waveform the gradient of the waveform is showm in the blue line and the slope which at the nearly 70 the trace velocity and trace actual 1 is of step input.
7. The different speed and torque output and the battery SOC and the battery current waveform is oberved and the screen shot of the waveform is submitted.
4.Keeping all other parameters same, compare the simulated results of hybrid and pure electric powertrains.
A. The compare of hybrid and pure electric is as follows.
| Sl.no | Pure electric vehicle | hybrid vehicle |
| 1. | Click on the matlab - type the power train block set in the help section- Click on the electric vehicle reference application-file are downloaded and give them the path- Simulinkmodel of the EV reference application is opened. |
Click on the matlab - type the power train block set in the help section- Click on the Hybrid electric vehicle reference application-file are downloaded and give them the path- Simulinkmodel of the HEV reference application is opened. |
| 2. | The grade value of 7 and the wind velocity is 1 is assigned in the environment block. | The grade value 7 and the wind velocity is 1 is assigned in the environment block. |
| 3. | The simulation time for the electric vehicles are less time when compare to hybrid electric vehicle | The simulation takes more time. |
| 4 | In the pure electric vehicle the waveform consists of motor speed and torque alone | In the HEV the waveform consists of the eng,motot,generator speed and torque. |
| 5 | The mile per gallon is increases and attains at steady value after some time. | The miles per gallon starts from 0 and increase and decreases to te lower limit. |
The output waveforms of the EV and HEVwith the WOT drive cycle are submitted.
The EV the waveform is obtained and the grade is about nearly 70. After the 50 the grade is decreased. the motor speed is follow as the grade waveform after(7sec) at 3000 rpm and the motor torque waceform inverse of the grade waveform after some time (50sec). The torque is having the both positive and negative peaks. The state of charge is decreases from the top limit (80%) to the below (76%) and again starts the increases and the SOC is constant after the 50 sec time.The miles per gallon(MPGe) of the fuel is increases as per the SOC and constant value attains after the 50seconds time.
For the HEV model the drive cycle of wot is assigned. The output waveforms are obtained . the trace velocity of the step input the grade is at nearly 70 and decreases after 50 and reaches to 0.
For the engine motor and generator speed the waveform is oscillating at the starting and settle after some time and follows the wave form of the grade. and in the torque waveforms the oscillating at the starting and settle after some time and follows the grade in inverse direction.
The state of charge (SOC) is linear at the start (80%) and starts decreasing up to the lower limit (65%). After that again it starts increasing . the soc is follows the waveform of the battery current.
The miles per gallon (MPGe) starts from 0 and attains high (8) and decreases up tot the (4) in a slightly manner decreases.
These are observation i had done with simulation of the reference applications.