Project 2
NITIALIZATION FILE
we can change the drive cycle by changing the drive cycle values:
- The Drive Cycle can be selected from this MATLAB Script, By changing the variable Drive_Cycle_Select to
1 UDDS
2 HWFET
Now lets complete the modelling part
CONTROLLER SUBSYSTEM
MOTOR CONTROL UNIT
POWERTRAIN
MOTOR
BATTERY
POST PROCESSING FILE
GRAPHICAL RESPONSE
UDDS DRIVE CYCLE
b)
c)
d)
e)
f)
g)
h)
HWFET CYCLE
b)
c)
d)
e)
f)
g)
h)
a) FUEL ECONOMY COMPARISON
i) Brief comments on each plots
- For both drive cycles, Vehicle velocity is strictly following the drive cycle velocity
- In UDDS,The number of operating points on engine fuel consumption map is higher than in the HWFET cycle
- In HWFET cycle, most of the time the vehicle is running in the 3rd & 4th gear since it is travelling on highway, But for UDDS , most of the time the gear shift happends between 1st & 2nd gear
- In UDDS, the brake pedal percentage is higher than in the HWFET drive cycle, since on city frequent braking happends
- For UDDS the engine Avg Power is around 60 Nm but for HWFET It is around 90 Nm
- The Avg Motor Torque & Motor power for HWFET is lower compared to UDDS, because UDDS cycle requires frequent torque need in city
- UDDS requires higher pack current and frequent voltage drop is happening. But in HWFET Most of the packcurrent is zero and voltage is around 154 Volts
- From the motor energy consumption map , the number of Operating points for UDDS is more compared to HWFET
- Fuel economy number for HWFET is higher than UDDS
CONCLUSION
- Forward energy based fuel consumption model of a Hybrid vehicle has been successfully Simulated using MATLAB and Simulink.
- We have succesfully run the post processing matlab file and analysed and understood the vehicle operating
points in terms of Motor & engine characteristics like speed, torque, transmission speeds, pedal positions, gear, distance traveled and plotted the graph - Successfully calculated vehicle fuel efficiency numbers (kmpl) for the given city cycle (UDDS) and highway cycle (HWFET)