Air-to-fuel ratio feedback control system with improved transitions between opening and closing of feedback control loop
September 7, 1997. 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 3916848 Exhaust gas sensor operating temperature detection system Engine with dual sensor closed loop fuel control Method and system for reducing noxious components in the exhaust emission of internal combustion engine systems and particularly during the warm-up phase of the engine Reducing noxious components from the exhaust gases of internal combustion engines Closed loop fuel control using air injection in open loop modes Control system for normalizing the air/fuel ratio in a fuel injection system Fuel control apparatus for an automobile engine equipped with an electronically controlled fuel injection system and an exhaust gas purifying system Dual sensor closed loop fuel control system having signal transfer between sensors during warmup Patent #: 4027477 InventorsAssigneeApplicationNo. 05/831290 filed on 09/07/1977US Classes:123/695, Variable reference value123/696, Proportional or integral circuit60/276, Having means analyzing composition of exhaust gas60/285Engine fuel, air, or ignition controlled by sensor of reactor conditionExaminersPrimary: Myhre, Charles J.Assistant: Lall, P. S. Attorney, Agent or FirmInternational ClassF02D 41/14 (20060101)Foreign Application Priority Data1976-09-23 JPAbstractIn an air-to-fuel ratio feedback control system of the type in which the output detection signal of an air-to-fuel ratio detector adapted to detect the concentration of an exhaust gas constituent of an internal combustion engine is compared with a preset value in a comparison circuit whose output signal in turn is utilized to feedback control the air-to-fuel ratio of mixture supplied to the engine, the preset value of the comparison circuit is changed to another value in response to the occurrence of a condition which requires the stopping of the feedback control of the air-to-fuel ratio of mixture supplied to the engine, thereby preventing the occurrence of malfunction during transient periods such as the periods of opening and closing of the feedback control system loop. | |
