Catalytic converter monitoring using downstream oxygen sensor
Patent 5159810 Issued on November 3, 1992. Estimated Expiration Date: 
August 26, 2011. 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.
August 26, 2011. 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 ReferencesMethod and apparatus for monitoring the activity of catalytic reactors Internal combustion exhaust catalytic reactor monitoring system Method and apparatus for monitoring and adjusting λ-probe-controlled catalytic exhaust gas emission control systems of internal combustion engines Patent #: 4622809 InventorsAssigneeApplicationNo. 750173 filed on 08/26/1991US Classes:60/274, Anti-pollution60/276, Having means analyzing composition of exhaust gas60/277, Having sensor or indicator of malfunction, unsafeness, or disarray of treater (e.g., fusible link, etc.)60/285, Engine fuel, air, or ignition controlled by sensor of reactor condition123/691Multiple sensors controlling group of cylindersExaminersPrimary: Hart, DouglasAttorney, Agent or FirmInternational ClassF01N 002/20AbstractAn exhaust gas oxygen sensor downstream of a catalytic converter is used to control a closed loop air/fuel ratio control system. A measured limit cycle frequency at various engine speed/load conditions is compared to stored benchmark limit cycle frequencies as functions of engine speed/load conditions. If the measured frequency is higher, the catalytic converter is considered to be degraded.Field of SearchAnti-pollutionHaving means analyzing composition of exhaust gas Having sensor or indicator of malfunction, unsafeness, or disarray of treater (e.g., fusible link, etc.) Engine fuel, air, or ignition controlled by sensor of reactor condition Multiple sensors controlling group of cylinders | |
