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      01-13-2014, 05:35 PM   #1
EdM5
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Collision Warning intervention...anyone?

So, yesterday I was driving the M5 through a narrow curved street in my neighborhood. I passed a few curbside parked cars at appproximately 20 mph and all of a sudden the collision warning system went crazy.
In a matter of a second, I got both the acute audible and visual warning. And then the system intervened and did an emergency brake, locking the wheels in the process

I was baffled because obviously there was no need for an intervention - I pass parked cars like that all the time and I was in complete control. Now if the street was slippery or icy I would've probably crashed into a parked car - because of the emergency brake stop.
Even my F10 535d with active cruise control and collision warning (ACC) never made an emergency brake intervention during 100.000 + miles in heavy stop and go traffic.

Does anyone happen to have this experience? I must say I don't like at all.
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      01-13-2014, 05:36 PM   #2
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Found this info on the BMW website:
The collision warning with braking function complements the Active Cruise Control with Stop & Go function to offer the driver additional assistance in avoiding potential collisions. The two systems can be activated independently of each other, but are tuned to work with one another when they are both in operation. The collision warning with braking function is based on a two-stage warning concept. The “pre-warning” is limited to a visual signal, which is displayed both in the instrument cluster and in the Head-up Display in the form of a red vehicle symbol, prompting the driver to increase his distance to the vehicle in front. At the same time, the brakes are pre-loaded, the deployment thresholds of the Adaptive Brake Assistant are lowered and the Brake Standby function of DSC activated. In this way, full brake pressure is built up more quickly under emergency braking, and the shorter stopping distances achieved as a result reduce the risk of a rear-end collision. The pre-warning is not used in situations in which Active Cruise Control with Stop & Go function is active, as this system already automatically ensures that an appropriate safe distance is restored. The second stage of the collision warning system is activated – regardless of the status of the Active Cruise Control with Stop & Go function – in the event of a higher level of collision danger. In situations requiring particularly rapid intervention on the part of the driver, the system triggers an acute warning. This consists of both visual and acoustic signals. At the same time, deceleration is initiated; the vehicle is braked at 3 m/s2 for a maximum of 1.2 seconds. Along with the flashing signal in the instrument cluster – and in the Head-up Display, if specified – and a warning tone, the driver is given an unmistakable signal that he needs to react. Thanks to the pre-loading of the brakes, everything is in place here as well to avoid a collision or alleviate the consequences of an impact significantly.
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      01-13-2014, 05:43 PM   #3
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Im confused. Were you using cruise control? 20mph is too slow for CC and adaptive braking system should only work with CC.
Maybe I am wrong.
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      01-13-2014, 05:44 PM   #4
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Hm - I have the collision warning system, but it's never braked for me - thank god. Sometimes the warning comes on because I'm doing a quick lane change to get through traffic. If the damn thing were to brake, I'd be guaranteed to have someone slam in to me. I am not interested in any tech which brakes or accelerates for me without input.

Glad I didn't tick the active cruise option.

OP - curious to hear what you figure out; there must be a way to disable that part of the system?
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      01-13-2014, 05:55 PM   #5
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Quote:
Originally Posted by greentrbo95gst View Post
Im confused. Were you using cruise control? 20mph is too slow for CC and adaptive braking system should only work with CC.
Maybe I am wrong.
No, I wasn't using CC and you can't spec ACC on the M5. Collision warning is part of the "driving assistance" (code 05AS).
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      01-13-2014, 06:00 PM   #6
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Quote:
Originally Posted by dhirm5 View Post
Hm - I have the collision warning system, but it's never braked for me - thank god. Sometimes the warning comes on because I'm doing a quick lane change to get through traffic. If the damn thing were to brake, I'd be guaranteed to have someone slam in to me. I am not interested in any tech which brakes or accelerates for me without input.
Exactly!
However, I found out that the CW system will intervene if deemed necessary.
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      01-13-2014, 08:08 PM   #7
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Wow, if this feature is on our cars, I hope it is advanced enough to consider if someone is on your rear bumper before it activates.
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      01-13-2014, 09:08 PM   #8
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Quote:
Originally Posted by EdM5 View Post
Exactly!
However, I found out that the CW system will intervene if deemed necessary.
Wow. You're right, at least in the US, there is no active cruise/stop&go system offered.

This is worth checking with BMW. If indeed that damn collision system is going to mash my brakes at some point, I will turn it off and stop using it altogether.

This is of significant concern to me.

EDIT: I re-read your passage above. I've definitely had situations - especially during particularly aggressive driving - where the collision warning thing emits a loud audible beep and flashes the red indicator while I'm approaching other cars rapidly. It has never done anything with the brakes - if it had, I'd remember.
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      01-14-2014, 08:23 AM   #9
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Woaw thats scary, My car doesn't have this option though so Im ok.. With the amount of small roads here, it would probably beep all the time.
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      01-14-2014, 03:21 PM   #10
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Prior to taking delivery of my M5, I always thought it had the Cruise Control with Stop and Go system.
It defiantly does not have it. It only has standard CC and LIM.

The collision warning system is activated or deactivated by pressing the button located on the button panel near the headlight cluster. After activating it, you can choose three modes using the iDrive controller (something like early, medium, late).

Lately I have had mine enabled in the middle setting. The system will flash a red car symbol if you are driving too close to another car or approaching a large stationary object in the road. That's a "pre warning" and can be changed to three different settings. Then when the car thinks that a frontal collision is immanent, it will display the red car symbol along with an audible noise. The three different settings has no change on this, it only changes the distance for the pre warning.

While I have experienced a pre warning and the warning with audible noise, the car has never braked for me.

I do however know that the 7 Series will brake for the driver. It's possible our M5 will as well, but I have never experienced that.
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      01-14-2014, 03:27 PM   #11
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Look at this YouTube video. This is a F10 5 Series, not sure what model year.

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      01-14-2014, 03:43 PM   #12
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If I remember what I read in the manual correctly, it is only supposed to brake for you if it detects a pedestrain.
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      01-14-2014, 03:54 PM   #13
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I just double checked the manual and there is nothing in there about the car braking for you. The description satrts on page 103 and, inc each case, tells you that the system will alert you that you need to brake.
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      01-14-2014, 05:38 PM   #14
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Quote:
Originally Posted by DrewM5
I just double checked the manual and there is nothing in there about the car braking for you. The description satrts on page 103 and, inc each case, tells you that the system will alert you that you need to brake.
That's what I thought.

So I guess:
F10 M5 will not brake for driver
F10 5er will brake for driver
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      01-14-2014, 05:48 PM   #15
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Exactly the same thing happened to me last week. 30mph light traffic. Cw came on and car self braked hard. No reason for emergency break, no pedestrians or cars were clause. Good job no one behind me. Very disturbing!
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      01-14-2014, 06:16 PM   #16
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Quote:
Originally Posted by m6gcjekyl View Post
Exactly the same thing happened to me last week. 30mph light traffic. Cw came on and car self braked hard. No reason for emergency break, no pedestrians or cars were clause. Good job no one behind me. Very disturbing!
Well, I'm sorry for you but I'm also glad that you've confirmed my story.

I'm pretty sure there's a difference in US vs. Euro market M5 specs. I checked the (dutch) manual and it says [translated by Ed ] "Intelligent Safety system - approach control warning with city-brake functionality: the system helps to prevent collisions, if a collision is unavoidable, the system will brake automatically.....the brake intervention is possible up to 60 km/h".

I checked the german BMW site, and I found the same explanation:
Darüber hinaus ist ein kamerabasierter Auffahrwarner im Umfang enthalten. Dieser erkennt Fahrzeuge im Frontbereich und warnt den Fahrer optisch und akustisch vor einem möglichen Auffahrunfall.
Bis zu einer Geschwindigkeit von 60 km/h sind die City Auffahrwarnung und der Präventive Fußgängerschutz aktiv. Bei einer drohenden Kollision mit Autos, LKWs, Motorrädern oder Fußgängern löst das System automatisch einen Anbremsvorgang aus.


So, the system can brake automatically in case of an impending collision with a vehicle, bike or pedestrian.

I guess, we got this brilliant system due to the tight european pedestrian protection regulations. Obviously, in the US there are no pedestrians
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      01-14-2014, 06:27 PM   #17
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I wonder if you can disable that. I would hate to have that (mis)feature.

Your only alternative is to keep your speed above 60kmh at all times.
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      01-14-2014, 06:31 PM   #18
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i don't think it brakes in the US...

I had it go full on when I was executing a pass last weekend.. (red flashing, momentary beeping), until I came out from behind the semi and back into the left lane where the road was clear... no braking intervention.

It also goes off everyday on my normal drive on a curved road where a guy parks his car and it seems like its stopped in the road but isn't... car never brakes
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      01-14-2014, 06:36 PM   #19
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Quote:
Originally Posted by dhirm5 View Post
Your only alternative is to keep your speed above 60kmh at all times.
LOL, I'll tell the neighbors!
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      01-14-2014, 06:48 PM   #20
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Quote:
Originally Posted by B-1 Pilot View Post
i don't think it brakes in the US...

I had it go full on when I was executing a pass last weekend.. (red flashing, momentary beeping), until I came out from behind the semi and back into the left lane where the road was clear... no braking intervention.

It also goes off everyday on my normal drive on a curved road where a guy parks his car and it seems like its stopped in the road but isn't... car never brakes
Ours doesn't brake but ours also doesn't have the radar. In the 550i this self braking is part of the advanced cruise control which also maintains distance when in cruise mode. I don't think you could have braking without radar because the radar validates the threat.

Also I have never had a false alert on either of my M5s.
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      01-14-2014, 07:20 PM   #21
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Quote:
Originally Posted by stealth.pilot View Post
Ours doesn't brake but ours also doesn't have the radar. In the 550i this self braking is part of the advanced cruise control which also maintains distance when in cruise mode. I don't think you could have braking without radar because the radar validates the threat.
Interestingly, the euro collision warning system - with brake intervention - is camera based. So, it will work properly only during daylight hours. The F10's ACC is radar based.

The reason why I ordered this system in the first place was a scary experience I've had a few years ago. At nighttime, on a dark highway I came across an unlit vehicle stalled in the left lane, thank god I was able to react. When approaching at 80+ mph, every second counts so I figured an early warning system could be useful.
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      01-14-2014, 08:10 PM   #22
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Quote:
Originally Posted by EdM5
Quote:
Originally Posted by stealth.pilot View Post
Ours doesn't brake but ours also doesn't have the radar. In the 550i this self braking is part of the advanced cruise control which also maintains distance when in cruise mode. I don't think you could have braking without radar because the radar validates the threat.
Interestingly, the euro collision warning system - with brake intervention - is camera based. So, it will work properly only during daylight hours. The F10's ACC is radar based.

The reason why I ordered this system in the first place was a scary experience I've had a few years ago. At nighttime, on a dark highway I came across an unlit vehicle stalled in the left lane, thank god I was able to react. When approaching at 80+ mph, every second counts so I figured an early warning system could be useful.
Marketing the anti collision with just the camera and no radar is poor form by BMW. They were probably chasing option revenue at high margin. Probably ACC is expensive and reduces take rate on the anti collision.
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