Interesting cruise control feature

screamace · 03-18-2019, 03:57 PM

Discovered an interesting feature about cruise control on my M550i:

I got off work late last Friday and turned on cruise control on my way home (30 miles highway) since there's no traffic. I set it to 80mph as usual. There's a large sweeping corner on the way, and as I started turning the steering wheel, I noticed the car started to slow down a bit (77-78mph). I thought it's weird and turned a bit more, it slowed down to 75-76mph. Once I returned the steering wheel to the center, speed resumed to 80mph. It's very linear relative to my steering input (or maybe lateral G?).

I figure it's a feature to avoid abrupt turning while on cruise control? Or to provide more comfort for the passengers? Didn't find any mention of this feature in the technical manual either.

I tested in my wife's 2016 X5 and no dice, truck maintained 80mph steadily in the corner.

Btw my car does not have ACC, tested in comfort mode (makes me wonder if it will behave differently in sport mode).

DBO · 03-18-2019, 04:17 PM

I remember seeing a video that mentioned a feature whereby the active cruise was linked to navigation data (i.e. knowing upcoming corners and slowing down). That could possibly be it, but it's probably also regional / market dependent on the quality of the nav data.

There's some vague mention of the coupling between Nav and ACC in the tech manuals.

SteveinArizona · 03-18-2019, 05:24 PM

Quote:

Originally Posted by DBO

I remember seeing a video that mentioned a feature whereby the active cruise was linked to navigation data (i.e. knowing upcoming corners and slowing down). That could possibly be it, but it's probably also regional / market dependent on the quality of the nav data.

There's some vague mention of the coupling between Nav and ACC in the tech manuals.

OP says his car does not have ACC. So he is describing an event with regular cruise control.

I do have ACC, use it a lot, and I have never seen this behavior.

Mach550 · 03-18-2019, 07:28 PM

The ACC uses GPS to slow the car around tighter bends. I've seen it multiple times and normally disable it when I know those turns are coming up.

screamace · 03-18-2019, 09:15 PM

Quote:

Originally Posted by SteveinArizona

Quote:

Originally Posted by DBO

I remember seeing a video that mentioned a feature whereby the active cruise was linked to navigation data (i.e. knowing upcoming corners and slowing down). That could possibly be it, but it's probably also regional / market dependent on the quality of the nav data.

There's some vague mention of the coupling between Nav and ACC in the tech manuals.

OP says his car does not have ACC. So he is describing an event with regular cruise control.

I do have ACC, use it a lot, and I have never seen this behavior.

I managed to find out more about it. Again, I don't have ACC so it's definitely now ACC scanning road or reading navigation map data.

It's actually a functionality called "Corner Speed Limiter" that's part of the BMW Dynamic Cruise Control feature, which adds braking function to cruise control. So if you are on a long downhill path, the car will actively brake to maintain set speed. A side product of the braking is this Corner Speed Limiter, it is said to provide "comfortable lateral acceleration". Not to be confused with Adaptive Cruise Control, which uses radar and camera and is much more advanced.

screamace · 03-18-2019, 09:17 PM

Here's a video from my dash cam. I set the cruise control to 82MPH (79 according to GPS). And you can clearly see the car slowing down as I enter the corner.

saporitj · 03-18-2019, 10:32 PM

Quote:

Originally Posted by screamace

Here's a video from my dash cam. I set the cruise control to 82MPH (79 according to GPS). And you can clearly see the car slowing down as I enter the corner.

Nice. What dash cam do you have? I Ike the quality.

mk1-fan · 03-19-2019, 12:31 AM

Quote:

Originally Posted by screamace

Discovered an interesting feature about cruise control on my M550i:

I got off work late last Friday and turned on cruise control on my way home (30 miles highway) since there's no traffic. I set it to 80mph as usual. There's a large sweeping corner on the way, and as I started turning the steering wheel, I noticed the car started to slow down a bit (77-78mph). I thought it's weird and turned a bit more, it slowed down to 75-76mph. Once I returned the steering wheel to the center, speed resumed to 80mph. It's very linear relative to my steering input (or maybe lateral G?).

I figure it's a feature to avoid abrupt turning while on cruise control? Or to provide more comfort for the passengers? Didn't find any mention of this feature in the technical manual either.

I tested in my wife's 2016 X5 and no dice, truck maintained 80mph steadily in the corner.

Btw my car does not have ACC, tested in comfort mode (makes me wonder if it will behave differently in sport mode).

I have the same on my 18 540i. Weirdly enough, my VW Amarok 2014 had the same feature, which is a bit unexpected in a utility vehicle.

530iDriver · 03-19-2019, 12:44 PM

Quote:

Originally Posted by mk1-fan

Quote:

Originally Posted by screamace

Discovered an interesting feature about cruise control on my M550i:

I got off work late last Friday and turned on cruise control on my way home (30 miles highway) since there's no traffic. I set it to 80mph as usual. There's a large sweeping corner on the way, and as I started turning the steering wheel, I noticed the car started to slow down a bit (77-78mph). I thought it's weird and turned a bit more, it slowed down to 75-76mph. Once I returned the steering wheel to the center, speed resumed to 80mph. It's very linear relative to my steering input (or maybe lateral G?).

I figure it's a feature to avoid abrupt turning while on cruise control? Or to provide more comfort for the passengers? Didn't find any mention of this feature in the technical manual either.

I tested in my wife's 2016 X5 and no dice, truck maintained 80mph steadily in the corner.

Btw my car does not have ACC, tested in comfort mode (makes me wonder if it will behave differently in sport mode).

I have the same on my 18 540i. Weirdly enough, my VW Amarok 2014 had the same feature, which is a bit unexpected in a utility vehicle.

For Americans: VW Amarok is a pick up truck

mk1-fan · 03-19-2019, 01:43 PM

Quote:

Originally Posted by 530iDriver

For Americans: VW Amarok is a pick up truck

Thanks for that

But I think for Americans it is a very small pick up truck.

530iDriver · 03-19-2019, 02:25 PM

Quote:

Originally Posted by mk1-fan

Quote:

Originally Posted by 530iDriver

For Americans: VW Amarok is a pick up truck

Thanks for that

But I think for Americans it is a very small pick up truck.

There has been internal debate at VWOA to bring this to the US market. It would be a better competitor to the rather laughable Honda Ridgeline pickup.

The European Ford Ranger is returning to this market so there is renewed interest in smaller pickups.

screamace · 03-19-2019, 07:30 PM

Quote:

Originally Posted by saporitj

Nice. What dash cam do you have? I Ike the quality.

Waylens Horizon, mounted to rearview mirror using BlendMount. I really like it, the app adds the HUD info on the video. There's an OBD2 Bluetooth adapter that can embed RPM and boost to the video as well. I didn't have it plugged in, because I have to unplug it every time I get off the car otherwise it will scream like crazy for leaving OBD2 plugged in :/

screamace · 03-19-2019, 07:31 PM

Quote:

Originally Posted by 530iDriver

There has been internal debate at VWOA to bring this to the US market. It would be a better competitor to the rather laughable Honda Ridgeline pickup.

The European Ford Ranger is returning to this market so there is renewed interest in smaller pickups.

Small SUV/Crossover has been successful, why not small pickups

clee1982 · 03-19-2019, 09:23 PM

Quote:

Originally Posted by screamace

Quote:

Originally Posted by saporitj

Nice. What dash cam do you have? I Ike the quality.

Waylens Horizon, mounted to rearview mirror using BlendMount. I really like it, the app adds the HUD info on the video. There's an OBD2 Bluetooth adapter that can embed RPM and boost to the video as well. I didn't have it plugged in, because I have to unplug it every time I get off the car otherwise it will scream like crazy for leaving OBD2 plugged in :/

Video quality looks pretty good, I remember reading reviews showing crap video quality (sunlight glare maybe)? I only drive car on the weekend and the garage is 10 minutes walking away from me so the long battery hour really sounds attractive if video quality is decent.

hlothery · 03-20-2019, 07:38 AM

To get back to the original post, this seems to be just another step towards our cars becoming autonomous driving devices. I have gotten used to the ACC, and actually like it most of the time, but I am just not ready to be driven around by a machine, rather than driving that machine myself. Call me old-fashioned (the old part is certainly true!), but I don't like this. My drives are much more than just getting from point A to point B. I enjoy them, on a visceral level. Hope that is not taken away from me in my lifetime.

ADS-UK · 03-20-2019, 07:42 AM

Quote:

Originally Posted by hlothery

To get back to the original post, this seems to be just another step towards our cars becoming autonomous driving devices. I have gotten used to the ACC, and actually like it most of the time, but I am just not ready to be driven around by a machine, rather than driving that machine myself. Call me old-fashioned (the old part is certainly true!), but I don't like this. My drives are much more than just getting from point A to point B. I enjoy them, on a visceral level. Hope that is not taken away from me in my lifetime.

Depends on how old you are

On a serious note, I agree. I'd always like to have the option to drive even if the car is fully autonomous.

AP · 03-20-2019, 07:51 AM

I could be wrong but Isn't the gear changing based upon Sat nav data just in place when in adaptive mode only.

Trying to find documentation on this as I'm sure I read that somewhere.
As always happy to be correct if wrong

AP · 03-20-2019, 08:00 AM

Ok found it, it's in the g12 technical docs (displays and controls) found on this website.

Describing the adaptive mode (not adaptive drive!!!)
"With the navigation system the mode makes use of the available maps data and optimises adaptive mode by predictive functions such as early reaction to bends junction and road type"

emre · 03-20-2019, 08:23 AM

On my way home there is a 10km section full of speed cameras, taking average speed.

I set the cruise control to 99km/h , never seen my car slow down when taking curves.
Going uphill speed goes down to 97km/h for a few seconds and up to 101km/h downhill but keeps the set speed otherwise when turning the wheel.

This is the regular cruise control, no ACC and I do not have adaptive drive either.

Chuckyarla · 03-20-2019, 09:24 AM

Quote:

Originally Posted by SteveinArizona

OP says his car does not have ACC. So he is describing an event with regular cruise control.

I do have ACC, use it a lot, and I have never seen this behavior.

I have ACC and notice this feature in action regularly.

SteveinArizona · 03-20-2019, 10:37 AM

I found a BMW Asia site that describes regular cruise control as having the slow down feature in curves. It also discusses ACC but doesn't say whether the slow down in curves applies to ACC as well:

http://www.bmw.com.kh/asia/en/insigh...cruise_control

AP · 03-20-2019, 11:54 AM

I've not noticed having acc myself but reasonable to assume it does. Presumably based upon steering angle. Think the key thing here is that it is reacting to the steering I put rather than pre emoting it
HOWEVER re the quote I got from the g12 tech manual as regards the dynamic mode , maybe in that mode it does? Something to try to drive the same road one time in adaptive mode and another time in say comfort.

03-18-2019, 03:57 PM	#1
screamace Private First Class 304 Rep 197 Posts Drives: 2020 BMW X5M Competition Join Date: Apr 2014 Location: Arkansas iTrader: (0) Garage List 2019 Porsche Paname ... [0.00] 2018 BMW M550i [0.00]	Interesting cruise control feature Discovered an interesting feature about cruise control on my M550i: I got off work late last Friday and turned on cruise control on my way home (30 miles highway) since there's no traffic. I set it to 80mph as usual. There's a large sweeping corner on the way, and as I started turning the steering wheel, I noticed the car started to slow down a bit (77-78mph). I thought it's weird and turned a bit more, it slowed down to 75-76mph. Once I returned the steering wheel to the center, speed resumed to 80mph. It's very linear relative to my steering input (or maybe lateral G?). I figure it's a feature to avoid abrupt turning while on cruise control? Or to provide more comfort for the passengers? Didn't find any mention of this feature in the technical manual either. I tested in my wife's 2016 X5 and no dice, truck maintained 80mph steadily in the corner. Btw my car does not have ACC, tested in comfort mode (makes me wonder if it will behave differently in sport mode). __________________ 2020 BMW X5M Competition 2019 Porsche Panamera 4 E-Hybrid Past BMW: 2018 M550i, 2016 X5 40e, 2014 335xi, 2011 X5 50i, 2010 550i
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03-18-2019, 04:17 PM	#2
DBO First Lieutenant 159 Rep 324 Posts Drives: G30 540i SDrive (MPPSK+Mods) Join Date: Dec 2017 Location: Brisvegas AU iTrader: (0)	I remember seeing a video that mentioned a feature whereby the active cruise was linked to navigation data (i.e. knowing upcoming corners and slowing down). That could possibly be it, but it's probably also regional / market dependent on the quality of the nav data. There's some vague mention of the coupling between Nav and ACC in the tech manuals. Attached Images Last edited by DBO; 03-18-2019 at 04:28 PM..
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03-18-2019, 07:28 PM	#4
Mach550 Captain 472 Rep 888 Posts Drives: 2019 M550i Join Date: Aug 2018 Location: Tampa Bay iTrader: (0) Garage List 2019 BMW M550i [8.00]	The ACC uses GPS to slow the car around tighter bends. I've seen it multiple times and normally disable it when I know those turns are coming up.
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03-18-2019, 09:17 PM	#6
screamace Private First Class 304 Rep 197 Posts Drives: 2020 BMW X5M Competition Join Date: Apr 2014 Location: Arkansas iTrader: (0) Garage List 2019 Porsche Paname ... [0.00] 2018 BMW M550i [0.00]	Here's a video from my dash cam. I set the cruise control to 82MPH (79 according to GPS). And you can clearly see the car slowing down as I enter the corner. __________________ 2020 BMW X5M Competition 2019 Porsche Panamera 4 E-Hybrid Past BMW: 2018 M550i, 2016 X5 40e, 2014 335xi, 2011 X5 50i, 2010 550i
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03-20-2019, 07:38 AM	#15
hlothery Seeking mental floss 482 Rep 806 Posts Drives: 2022 Mercedes EQS 450+ Join Date: May 2016 Location: San Antonio, Tx iTrader: (0)	To get back to the original post, this seems to be just another step towards our cars becoming autonomous driving devices. I have gotten used to the ACC, and actually like it most of the time, but I am just not ready to be driven around by a machine, rather than driving that machine myself. Call me old-fashioned (the old part is certainly true!), but I don't like this. My drives are much more than just getting from point A to point B. I enjoy them, on a visceral level. Hope that is not taken away from me in my lifetime.
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03-20-2019, 07:51 AM	#17
AP Major General 2777 Rep 5,093 Posts Drives: G30 M550 Join Date: Apr 2011 Location: UK iTrader: (0)	I could be wrong but Isn't the gear changing based upon Sat nav data just in place when in adaptive mode only. Trying to find documentation on this as I'm sure I read that somewhere. As always happy to be correct if wrong
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03-20-2019, 08:00 AM	#18
AP Major General 2777 Rep 5,093 Posts Drives: G30 M550 Join Date: Apr 2011 Location: UK iTrader: (0)	Ok found it, it's in the g12 technical docs (displays and controls) found on this website. Describing the adaptive mode (not adaptive drive!!!) "With the navigation system the mode makes use of the available maps data and optimises adaptive mode by predictive functions such as early reaction to bends junction and road type"
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03-20-2019, 08:23 AM	#19
emre First Lieutenant 85 Rep 375 Posts Drives: G30 540i xDrive Join Date: May 2010 Location: Istanbul iTrader: (0)	On my way home there is a 10km section full of speed cameras, taking average speed. I set the cruise control to 99km/h , never seen my car slow down when taking curves. Going uphill speed goes down to 97km/h for a few seconds and up to 101km/h downhill but keeps the set speed otherwise when turning the wheel. This is the regular cruise control, no ACC and I do not have adaptive drive either. __________________ G30 540i xDrive M Sport MPPSK / BM3
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03-20-2019, 10:37 AM	#21
SteveinArizona Brigadier General 3086 Rep 4,210 Posts Drives: BMW 530e Join Date: Jul 2016 Location: Greater Phoenix iTrader: (0)	I found a BMW Asia site that describes regular cruise control as having the slow down feature in curves. It also discusses ACC but doesn't say whether the slow down in curves applies to ACC as well: http://www.bmw.com.kh/asia/en/insigh...cruise_control
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03-20-2019, 11:54 AM	#22
AP Major General 2777 Rep 5,093 Posts Drives: G30 M550 Join Date: Apr 2011 Location: UK iTrader: (0)	I've not noticed having acc myself but reasonable to assume it does. Presumably based upon steering angle. Think the key thing here is that it is reacting to the steering I put rather than pre emoting it HOWEVER re the quote I got from the g12 tech manual as regards the dynamic mode , maybe in that mode it does? Something to try to drive the same road one time in adaptive mode and another time in say comfort.
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