Compensation for inherent fluctuation in output level of exhaust sensor in air-fuel ratio control system for internal combustion engine
Patent 4170965 Issued on October 16, 1979. Estimated Expiration Date: 
October 16, 1996. 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.
October 16, 1996. 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 ReferencesReducing noxious components from the exhaust gases of internal combustion engines Patent #: 3973529 InventorApplicationNo. 05/729826 filed on 10/05/1976US Classes:123/695Variable reference valueExaminersPrimary: Jordan, Charles T.Attorney, Agent or FirmInternational ClassesF02D 41/14 (20060101)F02B 1/04 (20060101) F02B 1/00 (20060101) Foreign Application Priority Data1975-10-27 JPAbstractIn a feedback control system for maintaining the air-fuel ratio of a combustible mixture fed to an internal combustion engine at a preset ratio, a fluctuation in the output characteristic of an exhaust sensor due to deterioration or low temperature is compensated for by varying a reference voltage, which serves as a standard of comparison, in response to a change in the mean value of the sensor output voltage. | |
