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01-23-2014, 10:31 PM | #23 |
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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.
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01-23-2014, 11:47 PM | #24 | |
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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 |
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01-24-2014, 02:10 AM | #25 | |
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01-24-2014, 07:39 AM | #26 |
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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
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01-24-2014, 08:17 AM | #28 | ||
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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. |
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01-24-2014, 08:59 AM | #29 |
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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.
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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 |
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