82 Locost
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| posted on 11/6/08 at 03:55 PM |
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Wideband Lambda Sensor
Quick question.
If I wire a wideband lambda sensor up can I just read the output voltage or do I need some kind of hardware to convert the output to a voltage?
I'm assuming the sensor just measures AFR, and that measurement translates into a voltage which can be measured with a voltmeter.
Presumably, there's also a voltage output which translates to the 'ideal' AFR?
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Agriv8
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| posted on 11/6/08 at 03:57 PM |
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I know on my vems system there is a calibration setup to go through when ever you introduce a new Wideband sensor.
HTH
Regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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BenB
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| posted on 11/6/08 at 04:00 PM |
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Normally the wideband controller corrects for temperature etc and then either outputs a given voltage or serial connection etc etc.
If you tried to measure the resistance of a wideband sensor you won't get much usable information.
But you can just attach a wideband controller and measure the volts coming out of it to get the wideband lamba reading (typically 14.1 ratio gives
1.41volts etc etc). It's only if you want a flash dial or to view the result on a laptop (for datalogging purposes etc) that you need the dials
etc.
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pajsh
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| posted on 11/6/08 at 04:01 PM |
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Why not ask Omega0684.
Clicky Here
I used to be apathetic but now I just don't care.
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82 Locost
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| posted on 11/6/08 at 04:51 PM |
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BenB and Robocog seem to be in slight disagreement.
I'm hoping to link to output to a data logger to record how lambda changes with revs under different loads to get a set of graphs.
If Ben's right then I'm happy. If Robocog's right then my plan is b@ggered.
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rachaeljf
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| posted on 11/6/08 at 05:05 PM |
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No they're not. You have to have a controller to manage the Nernst cell in the wideband sensor. The controller then outputs a helpful linear
voltage that represents the a/f ratio. You will get nothing useful out of a wideband sensor without its controller I'm afraid.
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stevebubs
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| posted on 11/6/08 at 05:41 PM |
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quote:
Originally posted by rachaeljf
No they're not. You have to have a controller to manage the Nernst cell in the wideband sensor. The controller then outputs a helpful linear
voltage that represents the a/f ratio. You will get nothing useful out of a wideband sensor without its controller I'm afraid.
Ditto
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MikeRJ
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| posted on 11/6/08 at 06:15 PM |
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quote:
Originally posted by 82 Locost
BenB and Robocog seem to be in slight disagreement.
I'm hoping to link to output to a data logger to record how lambda changes with revs under different loads to get a set of graphs.
If Ben's right then I'm happy. If Robocog's right then my plan is b@ggered.
That depends! When you say "wideband lambda sensor", do you simply mean the sensor itself, or a complete setup with a wideband controller
such as the JAW or Innovate LC-1?
If the former, then no since a wideband lambda does not produce a voltage output like the narrow band ones.
If the latter then yes, since the controllers can generally be configured to output the voltage and slope you require. 0.1v = 0.1 lambda is a very
common output.
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82 Locost
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| posted on 11/6/08 at 09:13 PM |
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Thanks guys. I guess the answer is that I can't use a data logger to plot graphs of lambda vs rpm unless I spend money on a controller.
Thanks for the help.
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adithorp
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| posted on 14/6/08 at 06:05 PM |
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Have you seen this thread?
http://www.locostbuilders.co.uk/viewthread.php?tid=89241
adrian
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