Control Autopilot use of Regen vs Braking

15

Now Implemented!

Description

Have an option to only use regen when Autopilot needs to brake, if safe to do so.

Competitive/Pricing/Notes

When you’re on autopilot or adaptive cruise control, and your car needs to come to a stop (either because there’s a slowing or stopped vehicle in front of you or it’s automatically stopping for a stoplight/sign), I notice that the car appears to use the brake calipers in addition to regen braking (above 5 mph).

To increase the lifespan of the friction brakes, I prefer to only use regen unless the other vehicle is stopping harder than expected. Many times I’ll disconnect AP so I can manually use regen – meaning I’m starting the deceleration process sooner than Tesla would. I understand in my older Model S, it only regens down to about 5 mph so brakes would be required for a complete stop.

Status

Implemented in vehicles with permanent magnet motors.  For induction motors, there is no regen available at very low speeds, hence the need for friction brakes.  Also, brakes used at these slow speeds cause negligible wear on the brakes.

lightly edited by moderator
Category: CY3XS Applies to:
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     Created 3-Jul-2020
JthePilot
137

3 Comments

Another option would be to vary the caliper force as needed like humans do instead of hard clamping. It is disruptive when at a redlight sometimes it brakes hard lets up and brakes hard again.

 
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    Created 20-Dec-2020
DavidP
198
Definitely not a stupid question.  I compare the rate of deceleration when I manually allow the car to come to almost a stop, without using the brake pedal, compared to how quickly it decelerates when it's stopping on autopilot.  The difference would be due to the addition of calipers in helping it slow, since there isn't a greater regen force that's applied.
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    Created 10-Jul-2020
JthePilot
137
Stupid question perhaps: How do you notice that it uses the brake calipers?
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    Created 4-Jul-2020
Fred
308