Dual EGO sensor closed loop fuel control
June 28, 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 ReferencesEngine with dual sensor closed loop fuel control Dual sensor closed loop fuel control system having signal transfer between sensors during warmup Method and apparatus for fuel-air mixture control Wide-range temperature operating system for combustion gas oxygen sensor, and method Apparatus for controlling the air-fuel ratio of an internal combustion engine Air/fuel ratio detector Double air-fuel ratio sensor system having improved response characteristics Double air-fuel ratio sensor system carrying out learning control operation Double air-fuel ratio sensor system having improved exhaust emission characteristics Double air-fuel ratio sensor system having divided-skip function Patent #: 4854124 InventorAssigneeApplicationNo. 724394 filed on 06/28/1991US Classes:60/274, Anti-pollution60/276, Having means analyzing composition of exhaust gas60/285Engine fuel, air, or ignition controlled by sensor of reactor conditionExaminersPrimary: Lararus, Ira S.Assistant: Heyman, L. Attorney, Agent or FirmInternational ClassF01N 003/20AbstractAir/fuel ratio control for an internal combustion engine includes the use of a first exhaust gas oxygen sensor (EGO) upstream of a catalytic converter and a second exhaust gas oxygen sensor downstream of the catalytic converter. The output of the first EGO sensor is passed through a high pass filter and then combined in a summer with the output of the second EGO sensor. The output of the summer is applied to a proportional and integral controller which then provides an output used to generate the fuel control signal. | |
