[atc98092]

My EUV doesn't seem to regen more than 8-9kW before engaging the friction brakes in cruise control though.

Yes, been discussed extensively. I believe I was the first to mention it, but I won't take credit if there was someone before me. For whatever reason, they changed the programming in 2022 to limit regen while using CC to no higher than 11kW. That's the best I've ever observed. going down the same hill, using either One Pedal mode or just applying the brake pedal I have seen regen at 2-3 times that number, so CC being activated is the sole reason.

Prior years report higher levels of regen with the CC engaged. It doesn't matter if it's standard or adaptive CC, the same limit is applied. I have no idea if there's been any software update released to change it back. When I take mine in for the battery replacement next week, I'll ask about it.

 

[Voldar]

Driving in one pedal in my EUV feels like I'm always dragging a boat anchor.

Sure, it can be seen like this if you don't control the "braking" using the acceleration pedal.

Driving in one peda....does it actually have a detrimental effect in highway driving if going a good distance at an essentially constant speed ?

If you are driving at a constant speed, why do you even care about the one-pedal driving ?

 

[Voldar]

For whatever reason, they changed the programming in 2022 to limit regen while using CC to no higher than 11kW.

This would a bummer if true. Imagine going downhill from the top of Mount Washington... this means your brakes will be hot like ****.

 

[atc98092]

This would a bummer if true. Imagine going downhill from the Mount Washington... this means your brakes will be hot like ****.

No, the brake pedal still generates full regen before the physical brakes are activated. You just can't use CC to maintain your speed. Turn CC off and use one pedal or the brake pedal to control the regen.

 

[GJETSON]

I'm talking about regular cruise control and adaptive cruise control will both cap out regen at ~8-9kW when controlling speed down a hill. SuperCruise uses adaptive cruise control, so yes, also applies but I don't think SC is the cause of this since it occurs in regular CC.

This is strange. Our 2017 Bolt never uses the brakes in CC, and and never varies from the set speed by more than 1 mph plus or minus.

 

[atc98092]

This is strange. Our 2017 Bolt never uses the brakes in CC, and and never varies from the set speed by more than 1 mph plus or minus.

Yep, it changed with the '22 model year.

 

[bartimusmaximus]

Agreed on all.

My EUV doesn't seem to regen more than 8-9kW before engaging the friction brakes in cruise control though. Anyone else experience that ? I'm talking about a steep hill where I can regen 20-25kW by disengaging cruise control and adjusting the pedal pressure in one pedal mode, or I can get 8-9kW before the car engages the friction brakes to slow me down.

I don't see that in my 22 EV. I use cruise control in one-pedal all the time and see recharge rates over 20Kw on steep descents all the time (western PA has lots of them).

 

[ARCowboy]

I don't see that in my 22 EV. I use cruise control in one-pedal all the time and see recharge rates over 20Kw on steep descents all the time (western PA has lots of them).

And the plot thickens... Maybe it's an EUV thing ? Based on the above posts, seems like we all might have EUVs.

Adaptive or regular cruise control ?

 

[GJETSON]

And the plot thickens... Maybe it's an EUV thing ? Based on the above posts, seems like we all might have EUVs.

Adaptive or regular cruise control ?

I suspect that the adaptive cruise control computer is using the hydraulic brake system, and not trying to integrate regen as well.

 

[atc98092]

I suspect that the adaptive cruise control computer is using the hydraulic brake system, and not trying to integrate regen as well.

On my EUV, it doesn't matter if it's in adaptive mode, but it's likely still the same computer controlling in either mode. Using CC down a hill the regen is capped at 11kW, and physical brakes do the rest. Turn CC off and use either one-pedal or applying the brake pedal, I can see regens double or triple that on the same downhill slopes.

 

[jefro]

My point was L versus D was to avoid brakes if possible, avoid Regen if possible.

 

[LoneR]

Maybe CC/ACC only operates with integration of ABS and StabiliTrack.

 

[NortonCommando]

... Using CC down a hill the regen is capped at 11kW, and physical brakes do the rest.
Turn CC off and use either one-pedal or applying the brake pedal, I can see regens double or triple that on the same downhill slopes.

gm has some splainin to do. It seems like a big step backwards.
How does that make sense using the friction brakes and throwing away all that potential energy if it was regen?

Maybe CC/ACC only operates with integration of ABS and StabiliTrack.

And yet my '17 CC uses regen to slowdown or maintain speed on a downhill.
And it uses the friction brakes seamlessly when the situation turns into 'Emergency Braking'.

 

[atc98092]

How does that make sense using the friction brakes and throwing away all that potential energy if it was regen?

I agree, which is why I never use CC except on relatively flat areas of the freeway. I don't want to leave any free energy untapped, when it's simple enough to manage it myself.

 

[EV Trek 37604]

Still trying to figure how people know when it starts using friction braking when in L mode while using cruise control. Mine never gives any type indication of which type of braking is being utilized. On my 17 coming down the mountain from North Carolina just using L mode and no cruise control it slows down too much so I have to speed back up. I know for a fact that no friction brakes are being used, so why would it need to use friction brakes when using cruise control?
I usually regain about 3 kWh of charge coming down that mountain.

 

[GJETSON]

On my 17 coming down the mountain from North Carolina just using L mode and no cruise control it slows down too much so I have to speed back up.

You do understand that your foot is controlling the speed?

 

[atc98092]

Still trying to figure how people know when it starts using friction braking when in L mode while using cruise control.

It's pretty obvious when the regen doesn't go higher than 11kW and you still feel the car being slowed. When the mechanical brakes are used by the car, it's not near as smooth as the car using regen. So yeah, not hard at all to tell. But since you mentioned L mode, that means you don't have an EUV, and that's the model that it's happening with.

I know for a fact that no friction brakes are being used, so why would it need to use friction brakes when using cruise control?

Again, it's a different model of car. When the CC is controlling speed, it's not using the full regen capabilities of the car, and instead applying the brakes. There's no reason for it, other than GM engineers made a mistake when programming the CC for the EUV.

 

[GJETSON]

When the CC is controlling speed, it's not using the full regen capabilities of the car, and instead applying the brakes. There's no reason for it, other than GM engineers made a mistake when programming the CC for the EUV.

Since it only happens on the EUV, and the EUV is the only model that offers Super Cruise, I suspect it has to do with that. They probably programmed regen to work that way on all EUVs, even those without Super Cruise, just to simplify programing.

 

[atc98092]

Since it only happens on the EUV, and the EUV is the only model that offers Super Cruise, I suspect it has to do with that.

Possible, I don't have SC, but they could have altered the programming for it. Still a dumb thing to do.

 

[EV Trek 37604]

It's pretty obvious when the regen doesn't go higher than 11kW and you still feel the car being slowed. When the mechanical brakes are used by the car, it's not near as smooth as the car using regen. So yeah, not hard at all to tell. But since you mentioned L mode, that means you don't have an EUV, and that's the model that it's happening with.

Again, it's a different model of car. When the CC is controlling speed, it's not using the full regen capabilities of the car, and instead applying the brakes. There's no reason for it, other than GM engineers made a mistake when programming the CC for the EUV.

Weird it works that way..