Final Project: Design of an Electric Vehicle

Objective: To model (a) an electric car using battery and a dc motor

Description: The complete block diagram for the electric car is shown below:

The input to the system is given by the FTP75 drive cycle source. This gives the reference input to the driver block.

The driver block compares the reference input with the actual vehicle speed and gives it to the PID controller. The output are the acceleration and deceleration commands. The output of the driver controller is given to the H-bridge motor drive which is driven by the controlled PWM voltage block.

The Lithium ion battery is connected via the motor drive.

The drive is connected to the Permanent magnet DC motor

The DC motor is connected to the vehicle body via a simple gear system. The output of the vehicle body is the vehicle speed.

Output:

The vehicle speed vs the speed reference is shown below for FTP74 drive cycle source. The vehicle speed matches the speed reference during the entire drive cycle.