03-13-2010, 09:53 AM
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CC Member
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Join Date: Jan 2004
Location: Shawbury,
Posts: 325
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Narrow band sensors will give a simple voltage signal output that shows if the AFR is rich or lean. They can't tell you what the exact air/fuel ratio is.
Wide band sensors basicly consist of a narrow band sensor that reads the AFR in a so called pump cell, where the inversed Nernst-effect is used to keep the AFR regulated stoichiomtric. The current that is required to keep AFR at 14.7:1 in this pump cell is proportional to the actual oxygen content in the exhaust gas. With this method the exact AFR can be measured.
Wide band sensors require a controller to operate. All wide band sensors are heated.
Simon
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