Cruise control slowdown in curves

[s4wrxttcs]

The safety Rivian (both the company via programmers, and the programmed vehicle itself) is concerned with is your speed in a curve. It either can't see far enough to accurately apply the right acceleration, or it requires turning further than its Driver+ limit.

Think of the accelerator as the "reassurance" button, telling your Rivian "it's okay, you got this!"

Watch this display next time it slows in a curve. I bet if you maintain speed instead of letting it slow, the little triangle gets small, meaning "too much turn, boss!" It occurs between 24-25°.

To all of the other curious folks on this or any other "Rivian problem," investigate the "problem" yourself and offer up your results to the group. It doesn't have to be a rigorous defensible dissertation, just give it the ol' college try before whining, you're very capable. Half of us are grease monkeys, half of us are computer-y nerds, and the rest fall somewhere in between (don't check my math, I work for the government).

https://www.britannica.com/science/scientific-method

Usually its because Rivian took the short cut, and didn't properly implement a real solution.

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[godfodder0901]

What setting are you referring to? I don't see any setting to enable or disable slow downs in corners.

It does not exist.

 

[iansriv]

For me. It speeds in the roundabouts. Should I even be on adaptive in roundabouts.

This man knows how to navigate a roundabout properly.
Roundabout

 

[Webleyaz]

I have been through Donner pass a bunch of times and have noticed that it will slow for many of the curves and none require a speed reduction. The annoying thing is when it slows before a curve then speeds back up entering the curve! Ridiculous.

 

[EVTrukHog]

One of the design criteria on interstate curves is to ensure vehicles can handle the curve at the speed limit without need for slowing down... state highways and secondary roads do not always follow this design requirement. Since the Rivian appears to have above average handling characteristics, I suspect there is a limitation in the camera's forward looking range when faced with a curve that exceeds a set radius of curvature - thus, the speed governor. I wonder if Gen2 improves this?

 

[mpshizzle]

Are we talking about highway assist or just cruise control?
For highway assist I can see the need to slow down. I don't like it, but I can see that

For just cruise control absolutely not. No reason it should slow down for any circumstances unless there's a car in front

 

[SwampNut]

[/QUOTE]

Are we talking about highway assist or just cruise control?

Just cruise does this. I have never had HA do it, because it only works on roads that have much gentler curves, at least around here.

 

[HalliBee]

I have less of a problem in the corners than I do on the highway with cruise control......I drive the Coquihalla daily to get to work, and when there's a slow semi in the slow lane, it will hammer the brakes, thinking there's an impending collision (I'm in the middle lane). I have to either turn off cruise, or move to the fast lane to avoid emergency braking. I've tried to turn off the emergency braking, but it turns itself back on as soon as I disable it......I have a ticket into Rivian, but haven't heard back yet.

 

[Oldsmobile_Mike]

Come ON Rivian, with all those cameras and sensors this truck should be a lot more capable.

In their defense, I think the software can handle it, but the cameras have pixels the size of dinner plates, so... ?

 

[misterturbo]

Same problem for me, and I drive mostly country highways and not major interstates. If you reduce the radius of your turn it will happen with less frequency (as insane as this sounds.. you really shouldn't...)

I've learned to get used to it and predict when it's going to do it. More unsettling than this is when a vehicle slides into a left or right turn lane (out of the travel lane) and the vehicle thinks you're going to collide and slams on the brakes without warning. This is the only car I've owned with driver aids that behaved badly in this scenario.

 

[godfodder0901]

Are we talking about highway assist or just cruise control?
For highway assist I can see the need to slow down. I don't like it, but I can see that

For just cruise control absolutely not. No reason it should slow down for any circumstances unless there's a car in front

Just cruise does this. I have never had HA do it, because it only works on roads that have much gentler curves, at least around here.

It most definitely does this with both HWA and ACC.

 

[MountainBikeDude]

This is a feature called CSA - Curve Speed Assist. It's always on with ACC and HWA, and there are no adjustments.

No, there isn't.

It was a bit annoying on my recent road trip from Vancouver to Kelowna BC. The speed limit is 120kph, set cruise for 135kph and at every bend, it would decelerate unnecessarily on each gradual bend. Because others were behind me at speed, I just cancelled the ACC and drove myself.

 

[Riviot]

It was a bit annoying on my recent road trip from Vancouver to Kelowna BC. The speed limit is 120kph, set cruise for 135kph and at every bend, it would decelerate unnecessarily on each gradual bend. Because others were behind me at speed, I just cancelled the ACC and drove myself.

FWIW, it'll maintain control if you apply pressure to maintain speed. I do this daily... May or may not be doing it right now...

 

[HalliBee]

I have less of a problem in the corners than I do on the highway with cruise control......I drive the Coquihalla daily to get to work, and when there's a slow semi in the slow lane, it will hammer the brakes, thinking there's an impending collision (I'm in the middle lane). I have to either turn off cruise, or move to the fast lane to avoid emergency braking. I've tried to turn off the emergency braking, but it turns itself back on as soon as I disable it......I have a ticket into Rivian, but haven't heard back yet.

Update....Rivian Service called me back. I explained that it wouldn't let me turn emergency braking off, they had me turn it off and do a hard reset, still turned itself off. He's going to refer it to the Service Center or Mobile Service to see why it won't stay off. He was unsure if the vehicle was designed like that, or whether there was something wrong....although it seems to me if you've added a button that turns it off, the intention would be that it would work.........

 

[Alanparkcity]

Just cruise does this. I have never had HA do it, because it only works on roads that have much gentler curves, at least around here.
[/QUOTE]
The 15 miles between Park City and Salt Lake City is 65 mph speed limit curvy interstate with a 2.5k foot elevation change. Curve slowdown happens in both directions, at any speed, in both standard cruise control and Driver+.

It sounds like many on this thread have the same issue, and wish this could be switched off.

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