US Patent 7204080 Air-fuel ratio controller for internal combustion engine
Patent 7204080 was granted and assigned to Toyota on April, 2007 by the United States Patent and Trademark Office.
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A first integration value is obtained by performing time integration on a feedback control signal during the time interval between the instant at which the deviation between a reference signal and the output signal of an oxygen sensor reverses from a negative value to a positive value and the instant at which the deviation reverses back to the negative value. A second integration value is obtained by performing time integration on a feedback control signal during the time interval between the instant at which the deviation between a reference signal and the output signal of the oxygen sensor reverses from a positive value to a negative value and the instant at which the deviation reverses back to the positive value. When the deviation between the absolute values of the first and second integration values is smaller than a predetermined threshold value, it is concluded that a feedback learning value is completely learned.
US Patent 07204080 Air-fuel ratio controller for internal combustion engine US Patent 7204080 Air-fuel ratio controller for internal combustion engine
US Patent 07204080 Air-fuel ratio controller for internal combustion engine
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