Week-4 Challenge WOT Condition Part-2
Q1)
A}
Mapped Models :-
- It is used when the behaviour of a particular model is not of our interest and can be modelled with the predefined values in the form of lookup tables.
- The provides overall engine characteristics, including actual torque, fuel flow rate and engine out exhaust simulation.
Dynamic Model :-
It is used when the internal response to a model with respect to its components is needed.
B}
- We can use the variant manager in the modelling tab to find the variant systems we have.
- Right-click on the model you want and use set as label mode active choice.
Q2)
- Battery power data is used to find power used in kWh which is then converted to gasoline equivalent using EPA value by dividing with 33.7.
- Vehicle speed data is used to calculate the distance travelled in meters which is then converted to miles.
- For HEV the gasoline equivalent of battery power is added with gallon used by IC engine then miles per gallon is calculated.
- Dividing distance travelled in miles by the number of gallons we can get miles per gallon.
- NOTE: As per the US environmental protection agency (EPA) 1 gallon of gasoline is equal to 33.7 kWh.
Q3)
Results:-
With the increase in grade and wind velocity,
- Deceleration time is reduced so batter recharging capacity is also reduced.
- Due to external forces, fuel economy is reduced.
- Peak velocity achieved is reduced as gradient force and Aerodynamic force becomes dominant.
- Battery SOC at the end of WOT acceleration is similar but during deceleration battery is charged more is the grade and win velocity is less.
Q4)
Comparison Between HEV and EV
- The top speed achieved by the HEV vehicle is less and the EV is more. The acceleration in 10 sec for HEV is 0 to 59.5mph and for EV is 0 57.2mph.
- In HEV the load of the vehicle gets distributed between the battery and the vehicle when the engine is running whereas in EV the entire load lies only on the battery. The peak current in the HEV was 500A and in the case of EV is around 220A which nearly less than half of HEV.
- The battery state of charge is proportional to the amount of current drawn from the battery. The EV vehicles seem to be more efficient as the battery SOC drop in case of HEV it is 10% drop in 10 seconds and in the case of EV it is 1.3% in 10 seconds.