How does the air pollution sensors works
06-01-2006, 04:52 AM
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I know what this button on the pics bellow is for. You can either operate it manualy or switch to "auto" mode. It closes the air intake for the cabin so you do not get to breath the outer pollution.
I'm just wondering how it works technicaly? I know there is some sensor, based on chemical analysis or something, if it detects some air pollution it closes the AC air intakes.....
But how it really works? What is the chemical formula to determine when to close and when open? For instance if you get a very very smelly 30 yrs old car blowing grey smoke infront of you will it close???
I'm just wondering how it works technicaly? I know there is some sensor, based on chemical analysis or something, if it detects some air pollution it closes the AC air intakes.....
But how it really works? What is the chemical formula to determine when to close and when open? For instance if you get a very very smelly 30 yrs old car blowing grey smoke infront of you will it close???
06-01-2006, 04:55 AM
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I think the sensor measures the presence of particulates. In my opinion, it works very well (and worked well in my E39s too.) Put it on auto and see if you ever notice smelling a diesel truck or bus in front of you. I only smell them in other cars...
06-01-2006, 06:21 AM
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Originally Posted by Peter530i' post='290857' date='Jun 1 2006, 02:52 PM
I know what this button on the pics bellow is for. You can either operate it manualy or switch to "auto" mode. It closes the air intake for the cabin so you do not get to breath the outer pollution.
I'm just wondering how it works technicaly? I know there is some sensor, based on chemical analysis or something, if it detects some air pollution it closes the AC air intakes.....
But how it really works? What is the chemical formula to determine when to close and when open? For instance if you get a very very smelly 30 yrs old car blowing grey smoke infront of you will it close???
I'm just wondering how it works technicaly? I know there is some sensor, based on chemical analysis or something, if it detects some air pollution it closes the AC air intakes.....
But how it really works? What is the chemical formula to determine when to close and when open? For instance if you get a very very smelly 30 yrs old car blowing grey smoke infront of you will it close???
I think that picture is from our E60 ! ..... or wait - it is 
It works like a charm in our car too.. But sometimes it dosen't close until it's too late, if some old diesel truck are in front of you.
06-01-2006, 06:28 AM
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There is a high tech sensor under the hood.... looks exactly like this:
06-01-2006, 06:44 AM
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Okay, here's a quote of some technical information from TIS on what's going on...
Sensor for automatic air-recirculation control (IHKA High only)
The AUC sensor is installed at the top of the fan cowl. The sensor is exposed to the sideways downwind from the auxiliary fan. The AUC sensor detects the following pollutant emissions from spark-ignition and diesel engines:
Full document on the IHKA is here:
air_conditioning_system__IHKA___Basic_and_High_E60_.pdf
Sensor for automatic air-recirculation control (IHKA High only)
The AUC sensor is installed at the top of the fan cowl. The sensor is exposed to the sideways downwind from the auxiliary fan. The AUC sensor detects the following pollutant emissions from spark-ignition and diesel engines:
- Hydrocarbons (HC)
- Carbon monoxide (CO)
- Nitric oxides (nitrogen monoxide NO, nitrogen dioxide NO2)
Full document on the IHKA is here:
air_conditioning_system__IHKA___Basic_and_High_E60_.pdf
06-01-2006, 10:23 AM
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Originally Posted by Rudy' post='290926' date='Jun 1 2006, 07:44 AM
Okay, here's a quote of some technical information from TIS on what's going on...
Sensor for automatic air-recirculation control (IHKA High only)
The AUC sensor is installed at the top of the fan cowl. The sensor is exposed to the sideways downwind from the auxiliary fan. The AUC sensor detects the following pollutant emissions from spark-ignition and diesel engines:
Full document on the IHKA is here:
Attachment 19926
Sensor for automatic air-recirculation control (IHKA High only)
The AUC sensor is installed at the top of the fan cowl. The sensor is exposed to the sideways downwind from the auxiliary fan. The AUC sensor detects the following pollutant emissions from spark-ignition and diesel engines:
- Hydrocarbons (HC)
- Carbon monoxide (CO)
- Nitric oxides (nitrogen monoxide NO, nitrogen dioxide NO2)
Full document on the IHKA is here:
Attachment 19926
06-01-2006, 01:09 PM
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Keep in mind that it detects pollution, it doesn't detect bad smell.
If there's stinky garbage or some fart outside that don't contain the filtered pollutants, then you'll still smell it
If there's stinky garbage or some fart outside that don't contain the filtered pollutants, then you'll still smell it
06-01-2006, 01:24 PM
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Originally Posted by jet190rs' post='291136' date='Jun 1 2006, 02:09 PM
Keep in mind that it detects pollution, it doesn't detect bad smell.
If there's stinky garbage or some fart outside that don't contain the filtered pollutants, then you'll still smell it
If there's stinky garbage or some fart outside that don't contain the filtered pollutants, then you'll still smell it
06-02-2006, 02:48 AM
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Originally Posted by E60Sim' post='290913' date='Jun 1 2006, 04:21 PM
I think that picture is from our E60 ! ..... or wait - it is It works like a charm in our car too.. But sometimes it dosen't close until it's too late, if some old diesel truck are in front of you.
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