2010 2011 BMW 5 Series Forum F10
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
 

2010 2011 BMW 5 Series Forum F10 BMW 5-Series (F10) Forums General 5-Series Sedan and Wagon (F10 / F11) Forum ACC w/ Stop & Go
Post Reply
 
Thread Tools Search this Thread
      01-23-2014, 10:31 PM   #23
ErnestHouse
First Lieutenant
United_States
29
Rep
379
Posts

Drives: 2014 535i GT
Join Date: Nov 2012
Location: South Florida

iTrader: (0)

Quote:
Originally Posted by ezmaass View Post
...I'd use it from time to time - specifically when it's late and raining... my least favorite time to drive.
ACC and Lane Departure shutdown in the rain. I remember driving 30 minutes in hectic traffic at night with the ACC helping out then hitting rain and I had to take over as each system shutdown (with a nice warning of course). Heavy rain in heavy traffic at night is stressful.
__________________
2014 535i GT M Sport Glacier, Mocha, ZDA, ZDB, ZDH, ZPP, 2VH, 416, 456, 4CK
Appreciate 0
      01-23-2014, 11:47 PM   #24
ezmaass
Lieutenant Colonel
ezmaass's Avatar
United_States
370
Rep
1,698
Posts

Drives: '17 650xi GC / '15 Audi R8 V10
Join Date: Oct 2008
Location: CT

iTrader: (0)

Quote:
Originally Posted by ErnestHouse View Post
ACC and Lane Departure shutdown in the rain. I remember driving 30 minutes in hectic traffic at night with the ACC helping out then hitting rain and I had to take over as each system shutdown (with a nice warning of course). Heavy rain in heavy traffic at night is stressful.
Wow - really?! I suppose even BMW's systems become a bit visually impaired in those circumstances. Seems like that's when drivers would need things like lane departure warnings the most, though!
__________________
2017 BMW 650xi Gran Coupe | MSport | Exec Package | Driver Assist Plus | ACC Stop & Go | Adaptive Drive | B&O | Night Vision | Cold Weather | Active Seats
2015 Audi R8 V10 | Brilliant Red on Black | S-Tronic | Carbon Sideblades | Carbon Trim | Full Leather | Sport Exhaust | Illuminated Doorsills | I-Pod | Contrast Stitching
Previous: '14 550xi, '07 335i, '01 325i
Appreciate 0
      01-24-2014, 02:10 AM   #25
immx
Private First Class
immx's Avatar
United Kingdom
5
Rep
159
Posts

Drives: 2012 520D SE Touring
Join Date: May 2013
Location: Essex, UK

iTrader: (0)

Quote:
Originally Posted by ErnestHouse View Post
ACC and Lane Departure shutdown in the rain. I remember driving 30 minutes in hectic traffic at night with the ACC helping out then hitting rain and I had to take over as each system shutdown (with a nice warning of course). Heavy rain in heavy traffic at night is stressful.
The ACC on mine works normally in th rain
Appreciate 0
      01-24-2014, 07:39 AM   #26
ErnestHouse
First Lieutenant
United_States
29
Rep
379
Posts

Drives: 2014 535i GT
Join Date: Nov 2012
Location: South Florida

iTrader: (0)

On page 113 of my user manual it says:
The system may not be fully functional in the following situations:
▷ In heavy fog, rain, sprayed water or snow‐ fall.

My experience was in a heavy rain. ACC was the first to shut itself down. Then Lane departure. YMMV
__________________
2014 535i GT M Sport Glacier, Mocha, ZDA, ZDB, ZDH, ZPP, 2VH, 416, 456, 4CK
Appreciate 0
      01-24-2014, 08:13 AM   #27
raleedy
Colonel
United_States
160
Rep
2,248
Posts

Drives: 2016 228i 6-speed
Join Date: Jul 2005
Location: Portland, Oregon

iTrader: (0)

I've found that the blind spot warning also works imperfecty and intermittently in heavy rain.
Appreciate 0
      01-24-2014, 08:17 AM   #28
BMWrules7
Lieutenant Colonel
306
Rep
1,684
Posts

Drives: 2015, 740 LdX, Alpine White
Join Date: Mar 2011
Location: Boston Area

iTrader: (0)

Quote:
Originally Posted by immx
Quote:
Originally Posted by ErnestHouse View Post
ACC and Lane Departure shutdown in the rain. I remember driving 30 minutes in hectic traffic at night with the ACC helping out then hitting rain and I had to take over as each system shutdown (with a nice warning of course). Heavy rain in heavy traffic at night is stressful.
The ACC on mine works normally in th rain
Well, there are two parts to the new ACC. The standard radar sensor that's been there for years, plus the newer ACC now uses the camera located near the rear view mirror.

The camera facilitates smoother operation when a car pulls away or into your lane. But, the ACC can function without the camera.

However, the camera is first to go when rains. The main sensor will fail during very heavy rain. But, ACC will still work without the camera.
Appreciate 0
      01-24-2014, 08:59 AM   #29
ezmaass
Lieutenant Colonel
ezmaass's Avatar
United_States
370
Rep
1,698
Posts

Drives: '17 650xi GC / '15 Audi R8 V10
Join Date: Oct 2008
Location: CT

iTrader: (0)

I guess this would make sense. While most types of industrial grade radar work just fine in the rain, the wavelength of the radar probably has a lot to do with how it performs in bad weather - like rain or fog. My understanding from some industrial radar applications is that they'll work just fine in rain, fog, or snow (still accurate), but their effective range is reduced... some types more dramatically. I'm guessing BMW has a threshold somewhere, and if passed, they consider it unreliable - specifically if the effective range is shortened too much?

Aside from whether the range is effected to the point of being dangerous, another line of reasoning here may simply be that BMW wants the driver to be alert and fully engaged with driving the car if in a bad weather situation, and ACC may be counter-productive. In one way I can see that, and in another way I like the idea that radar may be able to see further up the road than a person in poor visibility situations... IF that's true in the case of BMW's system.

In any case, it's good to know. I'm curious where the threshold is for the system and what BMW uses as input to tell - rain sensors and wiper speed, degradation of an echo response on the radar, the camera's visibility, etc. It would be interesting to know.
__________________
2017 BMW 650xi Gran Coupe | MSport | Exec Package | Driver Assist Plus | ACC Stop & Go | Adaptive Drive | B&O | Night Vision | Cold Weather | Active Seats
2015 Audi R8 V10 | Brilliant Red on Black | S-Tronic | Carbon Sideblades | Carbon Trim | Full Leather | Sport Exhaust | Illuminated Doorsills | I-Pod | Contrast Stitching
Previous: '14 550xi, '07 335i, '01 325i
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 01:23 PM.




5post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST