Week-4 Challenge WOT Condition Part-2

1.ans

1	mapped model of engine	dynamic model of engine
2	Mapped engines represent macro engine behaviour as a set of lookup tables(brake torque,fuel flow,air masflow,exhaust temperature,efficiency and emissions) as functions of commanded load and measured engine speed.	Dynamic engine decompose engine behaviour into individual component models that account for engine dynamics,most notably intake airflow and turbo charger dynamics.
3	.Mapped engine models are suitable for analysis and design activities that do not require enigne subsystem dynamic characteristics,for example in egine and transmission powertrain matching analysis for fuel economy,emissions and performance trade-offs.	Dynamics engine models are suitable for desiging control,estimator and diagnostic,algorthims that depend on dynamic subsysytem states,for example in closed loop AFR(air fuel ratio)control algorithm development.
4	pitcure of mapped model.	pitcure of dynamic model.

CHANGING the model type in EV powertrain blocks:

the below Figure shows that process of changing model type in EV powertrain.

1 select, passenger car>> Electric Car >> Electric Plant >> Power Blockset

2. inside the motor block right click to find the variant option.

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2nd ans.....

Miles per gallon (mpg) & miles per gallon equivalent (mpge):

for a conventional gasoline vehicle,the fuel efficiency is calculated via miles per gallon (mpg).however fuel efficiency for hybrid electric vehicles is calculated via miles per gallon equivalent(pge).mpg is the number of miles your car can drive per gallon of gas.figuring out an mpge rating is a littile more complicated.since engines that can use an alternative source of fuel cant be measured by liquid gallons of fuel,the mpge rating is calculated by figuring out the number of milles a vehicle can go using the same energy content as gallon of gas.the epa calculated that 33.7 kilowatt hours of electriccity is equivalent to one gallon of gas.

We should go inside ev reference block that is performance calculations:

inside this block will get actual mpg calculations:

Here,three different inputs are taken into considerations:

1.vehicle speed.

2.fuel flow.

3.battery power.

The vehicle speed inputs is in m/s which is converted into miles by multiplying with 0.000621371.

similarly the kilogram of fuel is converted into cubic meter by multiplying by1/(1000*0.739)

this cubic meter value is then converted into gallons by multiplying it with 264.172.the mile value and gallon value is used to find mpg of the vehicle.

now the battery value is initially converted from watts to kwh by dividing with 1000 and then to gallon equivalent by again dividing it with 33.7(sincw 33.7 kwh=1 gallon)

then divide the value by 3600 to get in per seconds and multiply by 0.00378541nto get the value in cubic meter per gallons.

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3rd ans

Open the HEV reference application

the garph

Grade - 5, wind velocity 10m/s

with the increase in grade and wind velocity,

• peak velocity achieved is reduced as gradient force and aerodynamic force becomes dominant.
• fuel economy is also reduced because the distance traveled is reduced due to external forces.
• deceleration time is reduced so batter recharging capacity is also reduced.
• Battery SOC at the end of WOT acceleration is similar but during deceleration battery is charged more is the grade and wind velocity is less.

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4th ans:

simulated results of hev:

the defult setting hybrid ev

simulated results of ev:

the defult setting pure electric powertrains.

1.The top speed is achieved by hybrid electric vehicle is more than that of EV.

2.The battery current capacity of pure EV is much higher compared to that of HEV since in EV battery is the only driving unit.

3.Higher fuel economy is achieved in case of pure EV.

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