Exhaust gas operated apparatus for continuously measuring air number of engine intake mixture
Patent 3948081 Issued on April 6, 1976. Estimated Expiration Date: 
April 6, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 6, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3220255 3611243 3644836 3736515 3738341 3820015 InventorsAssigneeApplicationNo. 496292 filed on 08/09/1974US Classes:73/23.21, With compensation detail (for error or drift correction, etc.)123/697, Heater for sensor or sensor environment204/408, With means for temperature or pressure compensation204/427, With gas reference material324/425, ELECTROLYTE PROPERTIES60/276, Having means analyzing composition of exhaust gas73/23.32Air-fuel ratioExaminersPrimary: Gill, James J.Attorney, Agent or FirmInternational ClassG01N 27/406 (20060101)Foreign Application Priority Data1973-08-16 DTAbstractThe output of an oxygen sensor is fed in parallel to the inputs of amplifiers having amplification in different portions of the sensor output range and having different gain. The amplifier outputs are combined in a summing circuit. The result is to smooth out the characteristic of the measurement and to produce a signal that can drive an indicator to provide a meaningful indication in terms of air number. The temperature of the oxygen sensor must be regulated or compensated for for good results. |
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