Exhaust gas recirculation control system for an engine
October 7, 2006. 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 ReferencesFuel injection system controlling air/fuel ratio by intake manifold gas sensor Air/fuel ratio for an internal combustion engine controlled by gas sensor in intake manifold Air-fuel mixture control for automobile engine having fuel injection system Exhaust gas recirculation control means for multiple cylinder engine having means for controlling air-fuel ratio in accordance with a signal from an exhaust gas sensor Method and apparatus for controlling the composition of the combustible mixture of an engine Exhaust gas recirculation system for internal combustion engine Air/fuel ratio detector Engine exhaust gas recirculation control system Patent #: 4614175 InventorApplicationNo. 06/916146 filed on 10/07/1986US Classes:123/704, Air/fuel ratio prior to combustion responsive means123/568.26, Having electromechanical actuator control of EGR valve204/425With impressed current meansExaminersPrimary: Wolfe, Willis R. Jr.Attorney, Agent or FirmInternational ClassesF02D 21/00 (20060101)F02D 21/08 (20060101) Foreign Application Priority Data1985-10-09 JPAbstractIn an exhaust gas recirculation control system for an internal combustion engine, intake air at the same pressure as that of a mixed gas flowing in an intake duct 2 and free from the exhaust gas is introduced to a reference air chamber 5 of an oxygen sensor 4. Any detecting errors due to a pressure difference between the mixed gas in the intake duct and the reference gas in the air chamber are thus eliminated. |
| ||||||||||||||
