Week-4 Challenge WOT Condition Part-2
1) Mapped-If you have engine data from a dynamometer or a design tool like GT-POWER.
For quasi steady-state engine simulations.
Data driven model generally by lookup table
Dynamic-If you need a more detailed dynamic model and have component-level data.
To analyze the impact of individual engine components on the overall performance.
It Calculates
Brake torque, using either the torque structure or simple torque model
- Fuel flow
- Air mass flow, using either the speed-density or dual-independent cam phasing models
- Air-fuel ratio (AFR)
- Exhaust temperature and exhaust mass flow rate
The Dynamic model is going to represent the actual component.
The static model is going to work faster and it runs based on the data given in the look-up table.
- Use variant subsystems to model and switch between different designs choices.
Right Click on the Variant Subsystem Block and then select the option variant.
In the loadmodeActivechoice you can see all the variant that are available and you can select from one of the option there.
2)
Within the performance calculation block, we include the inputs vehspd, fuelvolflw, and batterypower.
We integrate vehicle speed over time in order to capture distance.
We will add the Fuel volume flow and battery power over time.
Using the gain block, we convert the distance from m to miles and the volume of fuel to US gal equivalent.
The EPA introduced the MPGe metric in November 2010 on the Monroney sticker of the Nissan Leaf electric car and the Chevrolet Volt plug-in hybrid. The ratings are based on EPA's formula, in which 33.7 kilowatt-hours (121 megajoules) of electricity is equivalent to one (U.S.) gallon of gasoline
The battery power is converted to US gallon equivalent and then added to the fuel flow rate.
3)It takes longer to reach the desired speed as well as the battery's state of charge at the end of a drive cycle has decreased below 74% and fuel economy has been decreased as more power is now required to overcome hill climbing and drag.
4)
Pure electric vehicles consist of only motor and generator. Thus, battery will only be charged under regenerative braking, while in a HEV we can see that, whenever the SOC reaches 70%, the I.C. engine drives the generator and charges the battery again until the SOC reaches 80%.
An electric vehicle's efficiency is far greater than the efficiency of an internal combustion engine. By looking at the miles per gallon plot, we can see that Pure EV is more efficient than HEV.