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BEV CALIBRATION AND SIMULATIONS

Torque vs RPM motor map with efficiency contours

  • The base motor map is provided showing variation of motor torque (Nm) with motor speed (RPM)
  • The dotted blue line indicates the cut off region for the torque curve

Data: 

  • mass=1846 kg
  • Cd=0.24 (Drag co-efficient)
  • Crr=0.0079 (rolling resistance co-efficient)
  • frontal area=2.45 sq. m
  • Transmission efficiency=0.98
  • Power electronics efficiency=0.95
  • wheel radius=0.36m
  • Motor to wheel gear ratio=8

Built MATLAB scripts to simulate and plot several vehicle parameters based on three driving cycles viz:

  1. City driving cycle
  2. Highway driving cycle
  3. US06 driving cycle

Kindly contact for detailed explanation of MATLAB scripts and simulation results.

Note: Regenerative braking is taken into consideration in these simulations; we can see from the results (plots on MATLAB) the increase of SOC whenever braking happens

CITY DRIVING CYCLE:

Operating motor points in city driving cycle

Variation of Battery SOC (State of charge) in city driving cycle

 

 

 

 

 

 

 

 

 

 

 

City driving cycle plots on MATLAB

 

 

HIGHWAY DRIVING CYCLE:

Variation of Battery SOC (State of charge) in hwy driving cycle

Operating motor points in highway driving cycle

 

 

 

 

 

 

 

 

 

 

 

Highway driving cycle plots on MATLAB

 

US06 DRIVING CYCLE:

Operating motor points in us06 driving cycle

Variation of Battery SOC (State of charge) in us06 driving cycle

 

 

 

 

 

 

 

 

 

 

 

US06 driving cycle plots on MATLAB

HIGH Level SIMULINK MODEL:

High level EV simulink model

  • Several vehicle sub-systems modelled on Simulink as shown in the diagram above
  • With the closed loop feedback to the driver model, continuous monitoring of vehicle parameters such as motor speed, torque, wheel speed, torque, battery SOC, a,b and c currents of the motor and so on.
  • MPGe of the vehicle in different driving cycles was computed to analyse, control & improve performance and efficiency by performing various iterations of vehicle parameters depending on load conditions

Kindly contact for a detailed overview of the system and Simulink sub blocks within the system for better understanding and control.