Force Dynamics in EV — Lesson 2

This lesson covers the dynamics of electrical vehicles, focusing on the concept of tractive effort. It explains the forces required to move a vehicle, including rolling resistance, gradient force, aerodynamic drag, and acceleration forces. The lesson also delves into the effects of vehicle and wind velocity on aerodynamic drag power, and the impact of aerodynamic drag efficiency on power requirements. It further discusses the effects of different forces on vehicle velocity and power variation, and the implications of operating an electric vehicle on different terrains. The lesson concludes with the derivation of dynamic equations for understanding vehicle dynamics under different force inputs.

Video Highlights

00:50 - Forces required to move a vehicle
04:45 - Impact of Aerodynamic Drag Efficiency on Power Requirements
06:13 - Effects of Forces on Vehicle Velocity & Power Variation
09:48 - Implications of Electric Vehicle Operation on Various Terrains
15:06 - Explanation of the drivetrain of an EV
25:35 - Derivation of Dynamic Equations for Constant Tractive Effort
33:01 - Calculation of Instantaneous & Average Power for Vehicle Operation
36:02 - Importance of Average Tractive Power Calculation for Energy Calculations

Key Takeaways

- The total effort required to move a vehicle is a sum of various forces including rolling resistance, gradient force, aerodynamic drag, and acceleration forces.
- The aerodynamic drag power varies with respect to vehicle velocity and wind velocity.
- The power requirement of a vehicle increases significantly with an increase in aerodynamic drag efficiency.
- Operating an electric vehicle on a slope terrain puts a heavy burden on the vehicle battery, affecting its range.
- Dynamic equations can be derived to understand the dynamics of a vehicle for different kinds of force input.