Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...
Reexamination Certificate
2006-05-23
2006-05-23
Tran, Binh Q. (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
By means producing a chemical reaction of a component of the...
C060S274000, C060S276000, C060S277000, C060S284000, C060S286000, C073S118040, C073S023320, C701S103000, C701S109000
Reexamination Certificate
active
07047728
ABSTRACT:
A target value Vtgt for an output Vout of an O2sensor8(an exhaust gas sensor) disposed downstream of a catalytic converter4is set variably depending on a temperature TO2of an active element10of the O2sensor8by a target value setting unit18,and the air-fuel ratio of an exhaust gas is controlled by an air-fuel ratio control unit17to converge the output Vout to the target value Vtgt. An exhaust gas temperature Tgd is estimated by an exhaust temperature observer19,and the temperature TO2of the active element10is sequentially estimated by an element temperature observer20using the estimated value of the exhaust gas temperature Tgd. A heater13of the O2sensor8is controlled by a heater controller22to keep the temperature TO2of the active element10at a predetermined target value R. The air-fuel ratio is thus controlled to maintain a desired exhaust gas purifying capability of the catalytic converter irrespective of the temperature of the active element of the exhaust gas sensor.
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patent: 11-324767 (1999-11-01), None
Honda Giken Kogyo Kabushiki Kaisha
Squire Sanders & Dempsey L.L.P.
Tran Binh Q.
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