06-04-2018, 02:29 PM
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#385 (permalink)
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Thalmaturge
Join Date: Mar 2011
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Quote:
Originally Posted by NeilBlanchard
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On your last link, the most upvoted answer is, this... is it not correct, then?
Quote:
Andrew Qian
Andrew Qian, likes machinery, knows physics
Answered Apr 14, 2016 · Author has 570 answers and 1.1m answer views
The Tesla has what is called "brake-by-wire", meaning the pedal doesn't actually connect to the brakes. This is becoming a very common setup on hybrid cars, because the electric motor can usually provide a very significant braking force which needs to be controlled electronically anyways. The new Acura NSX for example has brake by wire as well.
What a brake-by-wire system should try to do is of course emulate the feeling of a normal brake pedal, aka the harder you press, the faster you slow down. In a hybrid or electric car, what you want to do is use electric braking to save wear on the brakes and charge the battery, until the point where the electric motor can't provide any more braking force, then begin to apply the friction brakes.
The limitations of electric braking are:
At low speed, the motor simply cannot generate much power
At very high speed, a small amount of force translates to a lot of power, which the battery can't absorb
Thus, the friction brakes are not engaged as long as the brake force required is less than the min of what the battery can take and what the motor can generate, but any more than that, you will activate the friction brakes. The Tesla is a very powerful car so I would expect it to be in full electric regen braking most of the time.
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