Week-4 Challenge WOT Condition Part-2

1) A mapped model uses lookup tables to characterize input and output relations between different components, whos input values have been obtained by physical testing or from a data sheet. A mapped model precisely models quasi-steady-state engine characteristics.                                         

A dynamic model breaks the component (engine, motor, or generator) into it's lower level components, or into the smaller components that make up the main component. Through this way, the dynamic characteristics can be captured. 

2) In the HEV Reference model, there are 3 inputs to calculate miles/gallon - (Vehicle Speed (m/s), the Volume flow rate of fuel (m3/s), and Battery Power (W).

Since it is an HEV, the vehicle is propelled using both fuel and battery. Hence, the energy from the fuel equivalent of the battery power has to be considered along with the energy from the fuel itself.

The Battery power is converted to m3/s of fuel equivalent using the kWh/USgal equivalent according to the US EPA standard, it is then added to the volume flow rate of fuel, and integrated to get the total volume of fuel. This total volume is converted to US gallons using a conversion factor. The vehicle velocity in miles is divided by the resultant US gallons to obtain equivalent miles/gallon fuel consumption.

3) Grade - 5 ; Wind Velocity 30m/s

 

Here, the wind velocities were changed, and change in SOC was observed, When the wind velocity was -30m/s, the

SOC was higher at a given time when the velocity was +30m/s.

For MPG too, when Wind was in the direction of acceleration of the car, the consumption was lesser.

4) For Electric Powertrain : 

 For Hybrid Powertrain :

For the HEV Powertrain the max Battery Current is 200 Amps, whereas, for the EV, it is half that value - 100 Amps.

The Velocities for both powertrains are almost identical.

For the HEV Powertrain, the Battery SOC is always between 80 and 70 percent, whereas for the EV, It starts at 80 and goes down to 71 percent.