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  1. #1
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    Adaptive Cruise - Presense question

    Hi everyone

    Does anyone know what can trigger pre-sense warnings with ACC?

    I thought it was all due to distance but going to work the other day it triggered when a very slow moving car pulled into my lane quite far in the distance (75m ish). I was travelling at about 50mph and they were probably doing 20mph but accelerating.

    This triggered my pre-sense warning but it didn't brake for me as I was just about to override the ACC brake anyway.
    Build Week 1: Panther Black S3 SB S-Tronic, black nappa, anthracite alloys, comfort pack with adaptive cruise and parking plus, active lane assist, adaptive xenons with variable range control and auto high beam, technology package HIGH with connect, B&O, tyre pressure warning, fold/dim/dip/heat mirrors, reversible boot liner, extended mono pur interior, privacy glass, hill hold assist, LED interior light pack, electric lumber support.

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  3. #2
    Cockney Boy's Avatar
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    What car have you got?
    Q7 S Line 2010
    MMI 3G
    Adaptive Cruise Control
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    Blackvue front and rear accident camera

  4. #3
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    As per sig - new S3
    Build Week 1: Panther Black S3 SB S-Tronic, black nappa, anthracite alloys, comfort pack with adaptive cruise and parking plus, active lane assist, adaptive xenons with variable range control and auto high beam, technology package HIGH with connect, B&O, tyre pressure warning, fold/dim/dip/heat mirrors, reversible boot liner, extended mono pur interior, privacy glass, hill hold assist, LED interior light pack, electric lumber support.

  5. #4
    snowfree52's Avatar
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    It's the difference in velocity that triggers the presense.
    A3 3-door TDI 184 Quattro Stronic Brilliant Red : Sline kit - Auxiliary heating - LED headlights - 18" 10-spoke rims - audi connect - magnetic ride - driver assistance package - side assist - rear camera + park assist - alcantara/leather seats - auto dimming mirror - panoramic glass sunroof - towing equipment - electric lumbar support - heated front seats - hold assist - high beam assist - advanced key - B&O sound system etc
    Tuning box DTUK, 235hp/480Nm
    1/4 Mile 13.84 @ 95.2 MPH
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  6. #5
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    Yes, that certainly seems to be what happened to me. I don't know why but I always thought it was distance related?
    Build Week 1: Panther Black S3 SB S-Tronic, black nappa, anthracite alloys, comfort pack with adaptive cruise and parking plus, active lane assist, adaptive xenons with variable range control and auto high beam, technology package HIGH with connect, B&O, tyre pressure warning, fold/dim/dip/heat mirrors, reversible boot liner, extended mono pur interior, privacy glass, hill hold assist, LED interior light pack, electric lumber support.

  7. #6
    snowfree52's Avatar
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    well it's related. presense sees you are still accelerating that means you didn't see the car, and it starts to brake when it thinks it's the last chance before the accident
    A3 3-door TDI 184 Quattro Stronic Brilliant Red : Sline kit - Auxiliary heating - LED headlights - 18" 10-spoke rims - audi connect - magnetic ride - driver assistance package - side assist - rear camera + park assist - alcantara/leather seats - auto dimming mirror - panoramic glass sunroof - towing equipment - electric lumbar support - heated front seats - hold assist - high beam assist - advanced key - B&O sound system etc
    Tuning box DTUK, 235hp/480Nm
    1/4 Mile 13.84 @ 95.2 MPH
    Porsche BBK...

  8. #7
    RossR's Avatar
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    Like the adaptive cruise it's looking at three things - distance, difference in speed and difference in rate of acceleration (or deceleration).

  9. #8
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    If it suddenly sees a car that it didn't see before, I think it's cautious for a bit until it can work out that it isn't a threat. If the car wasn't accelerating then it was probably just about to slow down. I've not seen the pre-sense warning come up in mine though for similar situations.
    Sport 2.0 TDI 150 Sportback in Scuba Blue, alcantara/leather, advanced key, audi sound system, comfort pack w/ ACC and park assist, deselect sports suspension, auto-dimming & folding door mirrors, electric lumbar support, heated seats, hold assist, non-smoking pack, side & lane assist, reversing camera, storage & luggage pack, tech pack with audi connect, tyre pressure warning, towbar, variable headlight range control, xenon light pack

 

 

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