Procedure to recognize the diffusion gas composition in a...

Electrolysis: processes – compositions used therein – and methods – Electrolytic analysis or testing – For oxygen or oxygen containing compound

Reexamination Certificate

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C205S785000, C205S785500, C205S782000, C205S783000, C205S784000

Reexamination Certificate

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07744740

ABSTRACT:
In a procedure to recognize the gas composition of a gas mixture, which consists of at least two gases of preferably different diffusion properties, delivered to a wideband lambda sensor, especially a gas mixture of an exhaust gas of an internal combustion engine of a motor vehicle, whereby the lambda sensor has a pumping cell with at least one gas measurement chamber, provision is made for the recognition of the gas composition of the gas mixture to result by means of modulation of the gas in the gas measurement chamber. Preferably the air number in the gas measurement chamber of the pumping cell is periodically altered, whereby the sensitivity of the lambda sensor to the gases, of which there are at least two, likewise periodically changes.

REFERENCES:
patent: 6280605 (2001-08-01), Jach et al.
patent: 2001/0050229 (2001-12-01), Schnaibel et al.
patent: 2005/0173265 (2005-08-01), Stahl
patent: 2005/0252771 (2005-11-01), Wiedenmann et al.
patent: 2006/0207244 (2006-09-01), Handler et al.
patent: 2006/0289314 (2006-12-01), Schnaibel et al.
patent: 199 12 102 (2000-10-01), None

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