Cruise Control 'surging'

[ahhhr]

ram really needed to use a smoothing algorithm on this thing. if you are following a car in front of you, it matches the cars driving in front of you exactly. in other words if the driver in front of you is crap, like an idiot who constantly breaks or accelarates, the ACC on my truck actually makes me car sick as it matches what the useless driver in front is doing.

My truck is worse driver than the guy in front.
If the guy in front gently slows down for a light, my truck hits the brakes so hard it has to accelerate again.

 

[jasonjm]

My truck is worse driver than the guy in front.
If the guy in front gently slows down for a light, my truck hits the brakes so hard it has to accelerate again.

mine defnitely is not that bad. if the driver in front is good and smooth, the ACC is acceptable.

when someone changes lanes in front of me and fills in the gap the cruise control was keeping, then it acts stupid, slamming brakes, and then accelerating hard after that.

 

[Gondul]

So drove from central Florida to South Carolina... while the surging was less pronounced for some reason it still did it with both standard cruise control and the adaptive cruise control... terribly annoying

 

[Gray Ghost]

ram really needed to use a smoothing algorithm on this thing. if you are following a car in front of you, it matches the cars driving in front of you exactly. in other words if the driver in front of you is crap, like an idiot who constantly breaks or accelarates, the ACC on my truck actually makes me car sick as it matches what the useless driver in front is doing.

then the other stupid thing it can do is get stuck between 2 gears, especially when going slow, around 10mph, it with shift nonstop between 2 gears, up down up down, in a very irritating jerky way.

anyways RAM if you are reading this - please, a smoothing algo on your ACC, there is no reason to keep EXACT distances at 200 to 400 feet, let the smoothing algorithm let the gap vary by 20 to 40 feet.

We did a trip from Houston to Dallas and back. When we were on ACC, even with the distance set to furthest out, my 2019 3500 Cummins standard SRW would hit the brakes hard and then accelerate hard. The cars I have been in are smoother. Also, when you add more bars for distance between you and the car in front then the deceleration/acceleration algorithm is smoother on most cars for my truck it doesn't really seem to matter. In my opinion, the RAM is way too abrupt (dead band is too tight).
Some cars even do an econo mode, which really was nothing more than a slower braking and throttle curve.

 

[Deleted member 80]

Somewhat related, I just reviewed some info on a Subaru Outback, and there is at least a setting to adjust the rate of acceleration for the cruise control.

 

[jasonjm]

i contacted ram directly to try bring this to their attention, any of you who have ACC i recommend you try the same, maybe if enough talk to RAM it will be done, its definitely a software fix, so certainly possible for them to implement at no real cost to them.

 

[Gondul]

Somewhat related, I just reviewed some info on a Subaru Outback, and there is at least a setting to adjust the rate of acceleration for the cruise control.

The ACC in the wife's Forester was super smooth as is the ACC in her Ascent... RAM kinda screwed the pooch on this one...

 

[@JC]

It comes and goes but is quite noticeable on the interstate. Have there been any updates/flashes to address this yet? Frustrating, as I never had a single issue with my Jeep GC.

On a 300 mile round trip today, I set it at 85 on level roads with the speedo showing 85, every few mins you'd feel a little surge and the speedo would bump to 86 and then drift back down to 85. It's never a case of falling back to 84 and then needing to get back to 85, it just surges for no reason.

Also the adaptive cruise is really touchy when approaching anything even slightly slower even with the distance set to the minimum single bar.

 

[Gondul]

I haven't had an opportunity to take her back out on the highway for any significant distance since my trip to the dealer... I will be taking a long trip in a couple of weeks so we will see if it still does the same thing.

 

[Gray Ghost]

i contacted ram directly to try bring this to their attention, any of you who have ACC i recommend you try the same, maybe if enough talk to RAM it will be done, its definitely a software fix, so certainly possible for them to implement at no real cost to them.

How did you contact them? Do you have a link to the contact info?
Thanks

 

[jasonjm]

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www.ramtrucks.com

go ahead and complain about the cruise control ACC. they actually called me back.

i got the latest OTA firmware update for the truck about 3 weeks ago, made no difference from ACC sucking. it still drives like a maniac

 

[@JC]

i got the latest OTA firmware update for the truck about 3 weeks ago, made no difference from ACC sucking. it still drives like a maniac

Yeah don't get it, my 18 Jeep GC cruise was absolutely perfect, no surging, held speed nuts on in just about any angle and adaptive eased down the speed approaching anything. The Ram is unpredictable but it does hold speed well on hills both up and down, surprisingly better than just going steady on the flat road and adaptive is too aggressive with the brakes. Small annoyance but, well, there it is.

FCA needs to get the Ram engineers together with the Jeep guys and figure it out.

 

[jasonjm]

it has no smoothing algorithm. it tries aggressively to keep EXACT distance to the inch. therefore it surges and brakes hard as it overshoots or undershoots, or as the drivers in front do stupid ****

 

[Gondul]

FCA needs to talk to Subaru... my wife's old Forester and now Ascent are smooth and you barely notice the transitions.

 

[carlrx7]

The ACC on my Camry will put your lips on the dashboard! I haven't experienced that with the RAM yet, but i do notice that it always slows me down going downhill. Cruise set to 60, traveling up an overpass you can feel the engine load increasing with it keeping 60 mph, but then once it crests and starts heading down the overpass you can feel the blacklash of the drivetrain as it lets off the throttle, next thing you know I'm going 58mph. Then it accelerates back to 60. Very annoying and a waste of fuel. I'm training myself to gently press the accelerator on the downhill to at least maintain or let it speed up (FREE ENERGY RAM!!!) I don't really care if the truck going 1-2 mph over when going down a bridge or hill. It is super annoying when vehicles dart out from behind me to pass, then when we hit the bottom it gets back on the throttle and they are stuck side by side or i start to run them over going up the next overpass. come'on man!

 

[jasonjm]

so props to ram, not sure if they read this forum or listened to the messages i sent to them diretly or you all sent to them, but i got a OTA update yesterday and the ACC is significantly improved.

not perfect but WAY better.

 

[Gray Ghost]

Do you have an update number? How can we tell if we have had the update? Cummins HO or regular? 3500? SRW or DRW?
Thanks!

 

[jasonjm]

2500 power wagon, not sure what the update number is, but it make both the ACC way better and i use android, the whole system with android is way less buggy. ill look next time im in the truck.
the ACC improvements were immediately noticble took less than 1 minute of using it to notice something had changed. i tested it with passengers today on a 30 min ride on LA freeways. normally if i used ACC the passengers would look at me like where did you learn to drive. I used it for 30 mins, lots of chatting, laughing, not one comment about "where the F you learn to drive?"

 

[johanh13]

Drove down to Miami and back from Tampa... while using both the Adaptive Cruise Control and normal Cruise Control, I could feel the truck constantly slowing and accelerating...while I can't say the road was perfectly flat, this is Florida so tak it for what it is worth... Anyone else experience anything similar?

Never had a vehicle behave int his manner...

Yep, mine surges with cruise on around town at lower speeds, 20-40MPH. Works great at highway speeds, anybody have any ideas? I do have adaptive, does it on both settings...

 

[thestuarts]

so props to ram, not sure if they read this forum or listened to the messages i sent to them diretly or you all sent to them, but i got a OTA update yesterday and the ACC is significantly improved.

not perfect but WAY better.

The OTA update is for the UConnect system which, to my knowledge, shouldn't affect the ACC system.