I have procrastination mode on my account so I needed to create another account to respond.
Re-reading that, I didn’t write very clearly - and thankfully my car doesn’t require braking to stop accelerating indefinitely.
What I meant was, in a combustion engine, there is still some acceleration that occurs as the engine drops from 6-7k RPM down to idle. If you’re running acceleration from 0-60 in 2 seconds, that continued acceleration after you take your foot off the gas and the engine runs down to idle may be another 10 mph. In my experience, acceleration for a combustion engine to hit its best time is usually pedal to the metal and isn’t a smooth stop at that exact top speed (which would require letting off the gas ahead of reaching the top speed so you don’t overshoot).
In context of the parent and regulating speed vs acceleration, my point was that fast acceleration can lead to people overshooting the intended speed / speed limit.
That said, power delivery for electric motors (that would be in the 2-3 second 0-60 range) may not have this ramp-down period, so acceleration would stop immediately (and maybe slow down aggressively with regenerative braking).
> there is still some acceleration that occurs as the engine drops from 6-7k RPM down to idle.
Not in any vehicle I've operated. The moment I pull off the throttle completely, it stops flowing any more than idle speed fuel mixture into the motor. Without that combustion power, it starts to act more like an air compressor almost immediately, causing negative force output. It is taking energy from the crank to try and compress a mixture which, when combusted (if even combustable, most likely not), results in less expansive force than the force it took to compress. This is even more pronounced at high RPMs as that action happens more times every second.
If I let go of the throttle on my motorcycle at 9krpms and like 70mph or whatever it feels like I pressed hard on my rear brake instantly, for all intents and purposes. You'll feel your weight get thrown forwards immediately.
If your car continues to accelerate after you've taken your foot off the gas something is wrong with your car.
Re-reading that, I didn’t write very clearly - and thankfully my car doesn’t require braking to stop accelerating indefinitely.
What I meant was, in a combustion engine, there is still some acceleration that occurs as the engine drops from 6-7k RPM down to idle. If you’re running acceleration from 0-60 in 2 seconds, that continued acceleration after you take your foot off the gas and the engine runs down to idle may be another 10 mph. In my experience, acceleration for a combustion engine to hit its best time is usually pedal to the metal and isn’t a smooth stop at that exact top speed (which would require letting off the gas ahead of reaching the top speed so you don’t overshoot).
In context of the parent and regulating speed vs acceleration, my point was that fast acceleration can lead to people overshooting the intended speed / speed limit.
That said, power delivery for electric motors (that would be in the 2-3 second 0-60 range) may not have this ramp-down period, so acceleration would stop immediately (and maybe slow down aggressively with regenerative braking).