Speed limiter qlitch?

sjb993 · 02-26-2023, 02:22 PM

In the past I’ve tended to use cruise control when appropriate, but recently I have been using the LIM button (with a speed limit “add on”) set to adopt the road’s speed limit.

Yesterday and today were the first occasions I had a decent run on motorways using LIM, and on a couple of occasions on both days LIM briefly went berserk. It was as if it dropped down a couple of gears, accelerated past the set speed and the LIM indicator in the display also started flashing. I took my foot of the accelerator and once the speed dropped to the set level, it maintained that speed and the LIM indicator stopped flashing.

(I did a software update to 2022-11 on Friday, but not having used LIM very much before the update, I have no reason to suspect that is the cause of the glitch.)

Has anyone else had this issue?

TIA.

paulockenden · 02-26-2023, 02:38 PM

I use the limiter a lot, and never seen this. I wonder whether it has a kick down function where it’ll over-ride the limit if it senses that you’re trying to floor it?

sjb993 · 02-26-2023, 02:47 PM

Thanks.

I wondered if it might be that. I’m pretty sure I didn’t stab the accelerator, but I’ll see if I can make it kick down. It would actually be good if kick down did work.

HighlandPete · 02-26-2023, 02:50 PM

Quote:

Originally Posted by sjb993

Thanks.

I wondered if it might be that. I’m pretty sure I didn’t stab the accelerator, but I’ll see if I can make it kick down. It would actually be good if kick down did work.

LIM can be overridden with the throttle. And yes it can give you a bit of a surprise.

sjb993 · 02-26-2023, 02:53 PM

Thanks - that’s good to know.

Billy Cheeseman · 02-27-2023, 03:07 AM

the limiter has a safety function in that if you plant the throttle it will kill the limiter to allow you to accelerate out of a dangerous situation

sjb993 · 02-27-2023, 03:22 AM

I'm pretty sure I didn't blip/stab/floor the accelarator, and I do occasionally invoke kick-down, so I know what that feels like when not in LIM mode. I'll do some experimenting with kick-down in LIM mode to find out how that behaves.

BTW - apologies, I should have

!

Soul_Glo · 02-27-2023, 03:55 AM

Kick down overrides LIM.
I have used LIM in the past and it’s easy to not notice the pressure your foot might be applying upon rest. Gradually increasing pressure without knowing it and then you’re in kick down or close.

LIM flashing I have never seen. I’d be inclined to check for stored fault codes.

HighlandPete · 02-27-2023, 04:15 AM

Quote:

Originally Posted by Soul_Glo

Kick down overrides LIM.
I have used LIM in the past and it’s easy to not notice the pressure your foot might be applying upon rest. Gradually increasing pressure without knowing it and then you’re in kick down or close.

I've been caught out, 'forgetting' I'm using LIM as I leave a restricted zone. The sudden awakening of the drivetrain, from a dead throttle pedal.

Talisman77 · 02-27-2023, 05:31 AM

Quote:

Originally Posted by Soul_Glo

LIM flashing I have never seen. I’d be inclined to check for stored fault codes.

From the manual:

"If the speed limit is exceeded: the indicator lamp in the instrument cluster flashes for as long as you exceed the set speed limit."

Charlie (Wessex) · 02-27-2023, 06:01 AM

I use it, but never let it auto set LIM. For eg on the M3 at the moment, there are 50mph roadworks, but the cameras pick up the 10mph work site speed limit.

srbs73 · 02-27-2023, 08:35 AM

After nearly 3 years, I didn't realise LIM was adaptive! Learnt something new. I use the adaptive cruise around town but there are times when this would be better suited.

Seaford · 02-28-2023, 05:31 AM

A small aside on this..I had the adaptive cruise set on my 840 as I was coming off the M23 to join the M25, happily doing 70 when the car dropped a couple of years and accelerated hard….the speed limit on the HUD was showing 120! Presumably the smart motorway limit (the adaptive cruise always picks these up without fail) had been incorrectly set as I went through.

Iancognito · 02-28-2023, 06:09 AM

Quote:

Originally Posted by Seaford

A small aside on this..I had the adaptive cruise set on my 840 as I was coming off the M23 to join the M25, happily doing 70 when the car dropped a couple of years and accelerated hard….the speed limit on the HUD was showing 120! Presumably the smart motorway limit (the adaptive cruise always picks these up without fail) had been incorrectly set as I went through.

Could it be your camera picked up on a 120kmh sticker on the back of a foreign truck?

Charlie (Wessex) · 02-28-2023, 08:24 AM

VW had a lot of problems with limiter converting mph over to kmh but the car's speed sticking to mph. Maybe all manufacturers have these glitches. Not entirely reassuring!!!

paulockenden · 02-28-2023, 09:12 AM

In town my camera sometimes sees the SO letters of a SOLD board as 80!

But it also picks up the 20 signs from left and right turns.

System needs a lot more work. That’s why I have mine set to manual confirmation.

bmnut · 02-28-2023, 04:19 PM

Quote:

Originally Posted by paulockenden

In town my camera sometimes sees the SO letters of a SOLD board as 80!

But it also picks up the 20 signs from left and right turns.

System needs a lot more work. That’s why I have mine set to manual confirmation.

Mine behaves very much like yours and is most irritating especially when you’re familiar with the speed limit on a known road.
The bit about “I have mine set to manual confirmation” intrigued me!
How do you set that?

Talisman77 · 03-01-2023, 01:11 AM

Quote:

Originally Posted by bmnut

Mine behaves very much like yours and is most irritating especially when you’re familiar with the speed limit on a known road.
The bit about “I have mine set to manual confirmation” intrigued me!
How do you set that?

https://youtu.be/9IJxse9P-BA iD8
https://youtu.be/soMZ0zwXKfo iD7

On the settings page for automatic speed you'd want "adjust manually"

bmnut · 03-01-2023, 10:22 AM

Quote:

Originally Posted by Talisman77

https://youtu.be/9IJxse9P-BA iD8

iD7

On the settings page for automatic speed you'd want "adjust manually"

Thanks for that Talisman77.
Mine is set to 'manually' when I checked but doesn't seem to make any difference!
I'll check it out more tomorrow on a run north of the border.

srbs73 · 03-01-2023, 11:34 AM

Quote:

Originally Posted by Seaford

A small aside on this..I had the adaptive cruise set on my 840 as I was coming off the M23 to join the M25, happily doing 70 when the car dropped a couple of years and accelerated hard….the speed limit on the HUD was showing 120! Presumably the smart motorway limit (the adaptive cruise always picks these up without fail) had been incorrectly set as I went through.

I've had a few of those in my local area in 30mph limits! I think it can also be down to bad map data as I can repeat it in the same spot every day.

Seaford · 03-02-2023, 02:49 AM

Quote:

Originally Posted by Iancognito

Could it be your camera picked up on a 120kmh sticker on the back of a foreign truck?

Yup, never thought if that.

The only time I have seen any of my BMWs ‘read’ anything is the memorable time when ‘cherries for sale 200 yards’ appeared from a road side sign

Oh, and another, on the A27 going past The Amex Stadium (70mph) it sometimes ‘reads’ the 30mph sign on the slip road.

02-26-2023, 02:22 PM	#1
sjb993 Lieutenant 191 Rep 532 Posts Drives: G20 M340i XDrive MHT Join Date: Jul 2021 Location: England iTrader: (0)	Speed limiter qlitch? In the past I’ve tended to use cruise control when appropriate, but recently I have been using the LIM button (with a speed limit “add on”) set to adopt the road’s speed limit. Yesterday and today were the first occasions I had a decent run on motorways using LIM, and on a couple of occasions on both days LIM briefly went berserk. It was as if it dropped down a couple of gears, accelerated past the set speed and the LIM indicator in the display also started flashing. I took my foot of the accelerator and once the speed dropped to the set level, it maintained that speed and the LIM indicator stopped flashing. (I did a software update to 2022-11 on Friday, but not having used LIM very much before the update, I have no reason to suspect that is the cause of the glitch.) Has anyone else had this issue? TIA.
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02-26-2023, 02:38 PM	#2
paulockenden Major 575 Rep 1,219 Posts Drives: 330e xDrive Touring Join Date: Oct 2020 Location: South Coast iTrader: (0)	I use the limiter a lot, and never seen this. I wonder whether it has a kick down function where it’ll over-ride the limit if it senses that you’re trying to floor it?
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02-26-2023, 02:47 PM	#3
sjb993 Lieutenant 191 Rep 532 Posts Drives: G20 M340i XDrive MHT Join Date: Jul 2021 Location: England iTrader: (0)	Thanks. I wondered if it might be that. I’m pretty sure I didn’t stab the accelerator, but I’ll see if I can make it kick down. It would actually be good if kick down did work.
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02-26-2023, 02:53 PM	#5
sjb993 Lieutenant 191 Rep 532 Posts Drives: G20 M340i XDrive MHT Join Date: Jul 2021 Location: England iTrader: (0)	Thanks - that’s good to know.
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02-27-2023, 03:07 AM	#6
Billy Cheeseman Fender bender 115 Rep 514 Posts Drives: Sky Grey 330e tour msport pro Join Date: May 2014 Location: Surrey UK iTrader: (0)	the limiter has a safety function in that if you plant the throttle it will kill the limiter to allow you to accelerate out of a dangerous situation __________________ "you only live once - enjoy yourself!"
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02-27-2023, 03:22 AM	#7
sjb993 Lieutenant 191 Rep 532 Posts Drives: G20 M340i XDrive MHT Join Date: Jul 2021 Location: England iTrader: (0)	I'm pretty sure I didn't blip/stab/floor the accelarator, and I do occasionally invoke kick-down, so I know what that feels like when not in LIM mode. I'll do some experimenting with kick-down in LIM mode to find out how that behaves. BTW - apologies, I should have !
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02-27-2023, 03:55 AM	#8
Soul_Glo Major General 13347 Rep 7,484 Posts Drives: G20 Join Date: May 2013 Location: Manhattan, NYC iTrader: (1)	Kick down overrides LIM. I have used LIM in the past and it’s easy to not notice the pressure your foot might be applying upon rest. Gradually increasing pressure without knowing it and then you’re in kick down or close. LIM flashing I have never seen. I’d be inclined to check for stored fault codes.
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02-27-2023, 06:01 AM	#11
Charlie (Wessex) Captain 289 Rep 922 Posts Drives: G21 M340i Join Date: Jun 2021 Location: New Forest, UK iTrader: (0)	I use it, but never let it auto set LIM. For eg on the M3 at the moment, there are 50mph roadworks, but the cameras pick up the 10mph work site speed limit. __________________ e36 325tds (1996-2001), e39 530d Touring (2001-2011), e61 535d (2011-2018), Golf 7.5R Estate (2018-2021), g21 M340i (2021- )
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02-27-2023, 08:35 AM	#12
srbs73 Major 551 Rep 1,165 Posts Drives: BMW i4 M50 Join Date: Jun 2020 Location: UK iTrader: (0)	After nearly 3 years, I didn't realise LIM was adaptive! Learnt something new. I use the adaptive cruise around town but there are times when this would be better suited.
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02-28-2023, 05:31 AM	#13
Seaford Lieutenant Colonel 1148 Rep 1,687 Posts Drives: 840 M Sport Gran Coupe Join Date: Feb 2016 Location: Seaford, England iTrader: (0)	A small aside on this..I had the adaptive cruise set on my 840 as I was coming off the M23 to join the M25, happily doing 70 when the car dropped a couple of years and accelerated hard….the speed limit on the HUD was showing 120! Presumably the smart motorway limit (the adaptive cruise always picks these up without fail) had been incorrectly set as I went through.
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02-28-2023, 08:24 AM	#15
Charlie (Wessex) Captain 289 Rep 922 Posts Drives: G21 M340i Join Date: Jun 2021 Location: New Forest, UK iTrader: (0)	VW had a lot of problems with limiter converting mph over to kmh but the car's speed sticking to mph. Maybe all manufacturers have these glitches. Not entirely reassuring!!! __________________ e36 325tds (1996-2001), e39 530d Touring (2001-2011), e61 535d (2011-2018), Golf 7.5R Estate (2018-2021), g21 M340i (2021- )
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02-28-2023, 09:12 AM	#16
paulockenden Major 575 Rep 1,219 Posts Drives: 330e xDrive Touring Join Date: Oct 2020 Location: South Coast iTrader: (0)	In town my camera sometimes sees the SO letters of a SOLD board as 80! But it also picks up the 20 signs from left and right turns. System needs a lot more work. That’s why I have mine set to manual confirmation.
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