Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Reexamination Certificate
2007-10-09
2010-02-02
Cronin, Stephen K (Department: 3747)
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
C123S672000, C060S274000
Reexamination Certificate
active
07654252
ABSTRACT:
An air-fuel ratio control system includes: a catalyst; an A/F sensor provided upstream of the catalyst; an oxygen concentration sensor provided downstream of the catalyst; an output value estimation portion that estimates the output value of the oxygen concentration sensor using a model related to the catalyst and the oxygen concentration sensor; an integral value calculation portion that calculates an integral value of deviation being updated by integrating the difference between the actual oxygen concentration output value and the estimated output value; a correction value calculation portion that calculates a feedback correction value for the output value of the A/F sensor and a target air-fuel ratio at least based on the integral value of deviation; and an air-fuel ratio control portion that zeros a first deviation that is obtained by correcting the difference between the detected air-fuel ratio and the target air-fuel ratio, using the feedback correction value.
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Kato Naoto
Okazaki Shuntaro
Castro Arnold
Cronin Stephen K
Sughrue & Mion, PLLC
Toyota Jidosha & Kabushiki Kaisha
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