Internal-combustion engines – Charge forming device – Air/fuel ratio prior to combustion responsive means
Patent
1992-06-16
1993-04-13
Okonsky, David A.
Internal-combustion engines
Charge forming device
Air/fuel ratio prior to combustion responsive means
123571, F02M 2506
Patent
active
052013030
ABSTRACT:
An EGR control device for an engine comprising: an exhaust gas recirculating passage for connecting an exhaust pipe to an intake pipe of an internal combustion engine; an exhaust gas recirculating valve provided at the exhaust gas recirculating passage for controlling a quantity of exhaust gas which is recirculated to intake air of an engine; an oxygen sensor provided at an intake passage on the downstream side of a junction point of the recirculated gas and the intake air for detecting an oxygen concentration of the intake air mixed with the recirculated gas; an exhaust gas recirculating valve passage area controlling means for controlling a passage area of the exhaust gas recirculating valve; a running state detecting means for detecting a running state of the engine; a calculating means for calculating a first exhaust gas recirculation ratio based on an output of the oxygen sensor and for calculating a second exhaust gas recirculation ratio corresponding to a value detected by the running state detecting means; and a feedback controlling means for performing a feedback control which increases or decreases the passage area of the exhaust gas recirculation valve so that the first exhaust gas recirculation ratio agrees with the second exhaust gas recirculation ratio.
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"Closed Loop Control of the EGR Rate Using the Oxygen Sensor" Minoru Nishida et al, pp. 1-13, Dec. 1988 SAE.
Macy M.
Mitsubishi Denki & Kabushiki Kaisha
Okonsky David A.
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