Re: Tesla
Gladstone:Whoopsy:..........
In a Tesla, if the driver touches the brake pedal, all the energy is lost as it disconnect the regen side. It's all physical brake with the brake pedal on a Tesla. Two completely different circuit.
Do you have a source for that ? I thought the physical brake pedal just added to the existing regen braking.
Not in a Tesla. If they do that the brake feel would completely gone as there will be two sets of controls fighting each other when braking. To use one the other has to be disabled.
When you press on the throttle in a Tesla it goes, but when one modulate the throttle, like easing off but not completely off, the car already starts regenerating, it's like the car is dragging something heavy slowing it down. Maximum regeneration occurs when car is still moving but the throttle is completely off. How do you modulate the regeneration with only the brake pedal when the braking system is purely mechanical and unconnected to the regen system?
For blended braking cars, there is a reservoir for storing brake fluid when pressed during the regeneration phase. Once that phase is exceeded, the 'excess' brake fluid will bleed back into the system to apply the friction brakes. That's how one can modulate blended braking with feel as it acts exactly like how a normal brake feels, you press a little it brakes a little via regen, you press harder and it brakes harder with stronger regen, you press really hard to stop quickly and the system engages the friction brakes on top of the regen and bring the car to a stop quickly.
It was discussed at length by lots of people when the first car from Tesla came out. Elon stressed at that time the brake pedal is completely unnecessary with regen braking but he has to put one it due to regulations or something like that.
That's was the start of one-pedal driving. Which do make some sense for city driving like stop and go traffic and such, those won't be hard stops and the regen braking of a Tesla is enough to bring it to a stop every time.
For other manufacturers that offers one pedal driving option similar to Tesla, it's easy as they already have the blended braking circuit in place, it's just a matter of programming. Not so easy with Tesla as they will need to completely redesign their mechanical hydraulic braking system to accommodate a reservoir and fill and bleed function and also tune the operation to make it seamless.
--