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?
Difference between Mapped and Dynamic models.
Engine,Motor and Generator.
Example of Changing Model Type
As per the snapshot appended below of the Generator of a Hybrid Electric Vehicle.
While we enter in Generator new screen with the below mentioned screen is available.
With an option to select between the Mapped Generator and the Dynamic Generator. Currently the mapped Generator is configured, if we to change this to the Dynamic Generator then we just need to follow the steps
Select the model which you want to configure ->Choose Varient Manager ->Right Click the model you wish to choose and then Set as Label Mode Active Choice.
2.How does the model calculate miles per gallon? Which factors are considered to model fuel flow?
The factors considered for indicating the Fuel Efficiency are as mentioned below.
i) Vehicle Speed
ii) Battery Power
iii) Fuel Flow
The conversion to Miles per Gallon and the fuel flow is as mentioned with the steps blow.
Coversion from Cubic Meter to gallon (m^3 to gallon),
As we know 264.172 US Gallon is 1000L.
The reference model taken here for consideration is HEV and as it operates on both the Battery and the Fuel injection Engine.
3.Run the HEV ReferenceApplication with WOT drive cycle. Change the grade and wind velocity in the environment block. Comment on the results.
HEV - WOT Drive cycle.
The cycle was carried out for 60 seconds.
Performance Scope - WOT Cycle
Observations:
1. plot 1 (Trace Velocity Target vs Actual)- Through this plot it is denoted that the desired Velocity has not been met by the actual velocity. The desired velocity was ranging at near about 140 mph but he actual velocity achieved was near to 110 mph
2. Plot 2 (Engine Speed, Motor Speed) rpm - This plot gives the detailed analysis for thr achieved Engine Motor speed in rpm. The contribution sources for meeting the required Velocity.
3. Plot 3 (Engine Torque, Motor Torque and Generator Torque) Nm - This plot gives the detailed analysis of the Engine, Motor Torque and Generator Torque
4. Plot 4 (Battery Current) A - This plot denoted the power produced by the Battery and the reading are in Ampere.
5. Plot 4 (Battery SOC) - This plot denotes the state Of Charge of the battery, this denotes the range of charge used for the achievement of velocity
6. Plot 6 (US Fuel Economy) MPGe - This is the Fuel Efficiency or the Range of the drive and the same is denoted in Miles per Gallon equivalent
WOT Cycle input for the change in Grade and Wind Velocity
The variables input for the change in these aspects are as given below.
The observations fron the results as compared to the normal situations are mentioned below,
Comments/Comparison of the reselt obtained.
1. Plot 1(Trace Velocity Target va Actual) - This is clearly that as the grade and the wind velocity is increased compared to the normal state the vehicle is not able to reach the target velocity
2. Plot 2 (Engine Speed, Motor Speed) rpm - In this plot comparing with the normal plot the Engine Speed has reduced to a steep stope on the negative side as compared to the normal situation the grade is increasing the load on the engine and thus the targeted Engine Speed is not met.
3. Plot 3 (Engine Torque, Motor Torque, Generator Torque) Nm - There are multiple variation in all these aspects and the same is visible in both the result of Normal and with the Grade and wind velocity
4. Plot 4 (Battery Current) A - Battery current has been fluctuating at a higher range as compared to the normal after the vehicle is reaching near to the steady/stable pace the fluctuation starts and is simulated
5. Plot 5 (Battery SOC) - The Battery state of charge remains more or less similar in both the cases and are resulted at 65% after the end of the WOT Cycle
6. Plot 6 (US Fuel Economy) MPGe - The average fuel economy differ in the range of 6 and 9 mph in both the scenarios.
4.Keeping all other parameters same, compare the simulated results of hybrid and pure electric powertrains.
Below mentioned vehicle is simulated for the EV Reference
The Performance and FE Results obtained are appended as below.
Below mentioned vehicle is simulated for the HEV Reference.
The Performance and FE Results obtained are appended as below.
