will the Audi pre sense automatically stop the car in front of a collision? - AudiWorld Forums

Go Back  AudiWorld Forums > Audi Models > Audi A6 / S6 / RS 6 > A6 (C7 Platform) Discussion
Reload this Page > will the Audi pre sense automatically stop the car in front of a collision?
Notices
A6 (C7 Platform) Discussion Discussion forum for the C7 Audi A6 produced from 2011
Sponsored by:
Sponsored by:

will the Audi pre sense automatically stop the car in front of a collision?

Reply

 
 
Old 02-25-2014, 02:49 PM
  #1
AudiWorld Member
Thread Starter
 
Join Date: Oct 2013
Location: north nj
Posts: 178
Default will the Audi pre sense automatically stop the car in front of a collision?

under low speed?

I have the driver assistance package but never had the chance to test this out.

the only functionality so far(I've experienced) is a warning light in the dash and seat belt tension itself if someone is approaching from behind too fast and too close.

Last edited by q5q7; 02-25-2014 at 05:36 PM.
q5q7 is offline  
Reply With Quote
Old 02-25-2014, 03:29 PM
  #2
AudiWorld Member
 
keithl's Avatar
 
Join Date: Jun 2013
Posts: 569
Default

Form the videos on YouTube and the manual it is worded to say it will reduce the intensity of a collision I do not think it will prevent it in certain situations. I had it kick in a once when a car in front of me slowed saddenly to make a turn and while I felt it start to brake I am not sure it would have braked enough. I am sure some of the wording is legal requirement as to not set a false sense of expectation that it will prevent the impact in all cases.
keithl is offline  
Reply With Quote
Old 02-25-2014, 03:36 PM
  #3
AudiWorld Member
Thread Starter
 
Join Date: Oct 2013
Location: north nj
Posts: 178
Default

Originally Posted by keithl View Post
Form the videos on YouTube and the manual it is worded to say it will reduce the intensity of a collision I do not think it will prevent it in certain situations. I had it kick in a once when a car in front of me slowed saddenly to make a turn and while I felt it start to brake I am not sure it would have braked enough. I am sure some of the wording is legal requirement as to not set a false sense of expectation that it will prevent the impact in all cases.
I am curious will it do something like this?
q5q7 is offline  
Reply With Quote
Old 02-25-2014, 04:08 PM
  #4
AudiWorld Super User
 
Join Date: Mar 2000
Posts: 20,326
Default

Dunno ... but I want that inflatable crash dummy!!!
Richard Solomon is offline  
Reply With Quote
Old 02-25-2014, 05:31 PM
  #5
Audiworld Junior Member
 
Homer1946's Avatar
 
Join Date: Jul 2013
Location: Fort Worth, Texas
Posts: 73
Default

The manual is VERY specific on what the car will do and stopping completely is not how it is designed. Other cars are programmed to completely stop and in fact there was recently a news reports (forget which station) that dinged Audi for not adequately stopping (automatically) to completely avoid a collision.

I am too lazy to read the manual right now but the protocol is something like this.

Imminent collision (in each case assume you don't do anything):

System provided visual and auditory alert (and if you do nothing...)
System provides brief sharp braking to get your attention
System then starts slowing at 3m/s/s.
System then starts slowing at 5 m/s/s.
(something like) 1/2 second before the collision the system slows down at full breaking.
Homer1946 is offline  
Reply With Quote
Old 02-25-2014, 05:32 PM
  #6
Audiworld Junior Member
 
Homer1946's Avatar
 
Join Date: Jul 2013
Location: Fort Worth, Texas
Posts: 73
Default

Oh, yea, I forgot. If at ANY point you touch the brakes the system takes that as permission to apply whatever braking force is necessary to prevent the collision (if possible).
Homer1946 is offline  
Reply With Quote
Old 02-25-2014, 06:00 PM
  #7
Banned
 
Join Date: Mar 2010
Posts: 433
Default

Originally Posted by Homer1946 View Post
Oh, yea, I forgot. If at ANY point you touch the brakes the system takes that as permission to apply whatever braking force is necessary to prevent the collision (if possible).
Not exactly. If you do nothing at all when that warning comes up, the car will brake hard. It's happened to me twice. It's standard operating procedure now to give more distance to the car turning right into a driveway, since if you keep a 3+ second gap and don't change lanes or slow down and the turning car takes it's sweet *** time pulling into the street or driveway, the car will brake.

Just today, in fact, I actually kept my foot on the accelerator and the car continued to brake. It first slowed down but then went hard on the brakes. I did not reach full stop because the offending slow turning car got out of the way. I'd say it left about a 20' gap after it started to brake hard. But it was starting to brake about 50' away.

When it happens, you'll know.

Last edited by in2dwww; 02-25-2014 at 06:02 PM.
in2dwww is offline  
Reply With Quote
Old 02-25-2014, 07:02 PM
  #8
AudiWorld Super User
 
snagitseven's Avatar
 
Join Date: Jul 2001
Location: SE MA
Posts: 13,760
Default

There are 4 or 5 pages in the manual dedicated to Presense and Braking guard. There are actually 3 levels of Presense; Presense basic (all Audis), Presense Rear (included w/Side Assist) and Presense Front (included with ACC). Presense Plus includes all three systems.

The Presense Front is directly coupled to the Adaptive Cruise Control (ACC), includes Brake Guard and like ACC, at 20 mph+, monitors followed vehicles and does not recognize stationary or small objects like people, some bikes, etc. If a followed car in front suddenly slows or stops, the Brake Guard will first provide a visible warning in the DIS followed by an audible tone and if the driver doesn't respond appropriately, will attempt to slow by applying the brakes and, if necessary, attempt to brake the car to a full stop. The Brake Guard will not engage if it comes upon a stationary object including a previously stopped vehicle that wasn't already being tracked by the ACC or a wall, tree, light pole, etc.

My take - It's really a matter of design philosophy. I believe Audi designed the system to avoid collisions with the least amount of automatic intervention in order to not excessively intrude on the driver's control. In other words, I think Audi could design a system to alert and stop the car sooner for earlier warning of a collision but it would be at the expense of more frequent alerts and earlier auto braking, perhaps to the "nannying" frustration of drivers. Consequently, as designed, Audi states in the manual that their safety systems (or all others for that matter) cannot overcome the laws of physics. No auto braking system can stop a 4000 vehicle traveling at 45 mph in time as a car pulls out of a driveway right in front of you or a car in front comes to a screeching halt if you're too close.

An automatic accident avoidance system can't totally prevent a collision while at the same time, not intrude with the driving experience to some degree. I, for one, would not want an automatic accident avoidance system that engages too soon and too frequently, overriding and dampening my driving enjoyment. As the Audi systems are designed, I feel it's probably a reasonably balanced compromise between safety, comfort and driver control. At the end of the day, like ACC, Side Assist, Lane Assist, cameras, etc, Presense and Brake Guard are aids, not replacements for common sense; the driver must still ultimately be responsible for the safe operation of the vehicle.

I think it's important that every owner spend a few minutes to carefully read the manual sections addressing the various Presense and Brake Guard systems as equipped in their own vehicle. Forewarned is forearmed.
snagitseven is offline  
Reply With Quote
Old 02-25-2014, 08:03 PM
  #9
AudiWorld Member
Thread Starter
 
Join Date: Oct 2013
Location: north nj
Posts: 178
Default

The key point from reading the manual and the replies is that the Audi Brake Guard won't stop you "when approaching a stopped vehicle or stationary obstacle".
q5q7 is offline  
Reply With Quote
Old 02-26-2014, 03:28 AM
  #10
AudiWorld Super User
 
snagitseven's Avatar
 
Join Date: Jul 2001
Location: SE MA
Posts: 13,760
Default

Originally Posted by q5q7 View Post
The key point from reading the manual and the replies is that the Audi Brake Guard won't stop you "when approaching a stopped vehicle or stationary obstacle".
Correct, unless the Presense Front/Brake Guard system was already detecting a moving vehicle before it stopped. (The manual states so long as Brake Guard is not turned off in the MMI and the ESC button is not disabled by the driver, it will detect a moving, followed vehicle even if ACC is not activated).
snagitseven is offline  
Reply With Quote
 
 
 

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
PA-Driver
A4 (B8 Platform) Discussion
4
02-02-2016 08:26 PM
wantfryswiddat
TT (Mk1) Discussion
4
09-21-2015 05:55 AM
gregorydouglas89
A4 (B7 Platform) Discussion
18
09-01-2015 10:33 PM
Janryk
A4 Cabriolet (B6 Platform) Discussion
0
08-30-2015 02:12 AM
Jks2327
A4 (B6 Platform) Discussion
0
08-27-2015 02:43 PM


Thread Tools
Search this Thread
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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -8. The time now is 01:12 PM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: