Device for measuring a component of a gaseous mixture
Patent 4905652 Issued on March 6, 1990. Estimated Expiration Date: 
May 30, 2009. 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.
May 30, 2009. 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 ReferencesDeteriorated condition detecting apparatus for an oxygen sensor Combustibles analyzer Steady state mode oxygen sensor and method Oscillatory mode oxygen sensor and method Sensor for oxygen-combustibles gas mixtures Gas analysis apparatus Air-to-fuel ratio sensor Patent #: 4568443 InventorsAssigneeApplicationNo. 361717 filed on 05/30/1989US Classes:123/679, Combined with engine condition responsive means123/688, Inoperative sensor responsive123/691, Multiple sensors controlling group of cylinders204/401, Fault testing of sensor or component204/410, Solid electrolyte means204/412, Three or more electrodes204/425With impressed current meansExaminersPrimary: Argenbright, Tony M.Attorney, Agent or FirmForeign Patent References
International ClassesG01N 027/58F02D 041/22 Foreign Application Priority Data1985-10-18 JPAbstractA device for detecting and measuring the concentration of a gas in a mixture of gas such as oxygen in the exhaust gas of an internal combustion engine and circuits for using that measurement to control the air-fuel ratio supplied to the engine. The detecting device has two separate gas residence chamber with different diffusion resistance openings for each chamber and separate pairs of electrodes for each chamber whereby the measurement can be separately made in each chamber. The particular chamber selected for measurement may be done on the basis of whether the air-fuel ratio is lean or rich whereby a substantially linear reading results for all ratios or on the basis of the transition-state or steady-state operating condition of the engine to provide either more rapid or more accurate readings. Further, by using the cells from both chambers to compare their readings and standards, the actual readings can be corrected for abnormalties that may occur after a period of use or to indicate the detector has become defective.Other References
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