3 ms·
> Moreover, modern traction control systems are just plain good. This isn't something exclusive to electric cars—even gas-powered vehicles have achieved decent
by vvanders 3y ago
> Moreover, modern traction control systems are just plain good. This isn't something exclusive to electric cars—even gas-powered vehicles have achieved decent torque vectoring by modulating brakes independently at each wheel, but modern EVs take it up a notch by performing thousands of software-based every second.
While this is not wrong it's also missing the fact that EVs use AC VFD motors that don't need to have a closed loop response under traction loss due to the fact that the AC field will slow down the wheel of it tries to over speed just by nature of how the mechanism works. This helps keep the wheels in the static friction region where traction is highest. In trains this and other factors[1] contribute to a 2x increase in traction over DC motors. With an ICE you have all sorts of momentum in the flywheel and drivetrain that are trying to runaway until the system/driver reacts and compensates.
[1] http://www.republiclocomotive.com/ac-traction-vs-dc-traction.html http://www.republiclocomotive.com/ac-traction-vs-dc-traction...
- HyperSane 3y agoso from a traction perspective electric motors are dynamically stable while ICE are dynamically unstable.