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Patent Searching and Data


Title:
FUEL-INJECTION-QUANTITY CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2012/014328
Kind Code:
A1
Abstract:
The disclosed fuel-injection-quantity control device calculates (step 1140) a time integral value (SDVoxslow) by means of integrating the value of the deviation (DVoxslow) that is between the detected value (Voxs) by a downstream air-fuel ratio sensor disposed downstream of a catalyst and a downstream target value (Voxsref) and that is multiplied by a predetermined adjustment gain (K), and records (step 1165) the time integral value (SDVoxslow) as a sub-FB learning value (KSFBg). The device sets (steps 1125 through 1135) the aforementioned adjustment gain (K) in the case that the sub-FB learning value increases and the aforementioned adjustment gain (K) in the case that the sub-FB learning value decreases to different values in a manner so that the absolute value of the difference between the magnitude of the rate of increase of the sub-FB learning value and the magnitude of the rate of decrease of the sub-FB learning value is reduced. The control device determines that the sub-FB learning value has converged when the sub-FB learning value is, for at least a predetermined time period, present between a minimum value that is a predetermined value subtracted from a determination reference value and a maximum value that is a predetermined value added to the determination reference value in response to the center of fluctuation of the sub-FB learning value.

Inventors:
OKAZAKI Shuntaro (1 Toyota-ch, Toyota-shi Aichi 71, 〒4718571, JP)
岡崎 俊太郎 (〒71 愛知県豊田市トヨタ町1番地 トヨタ自動車株式会社内 Aichi, 〒4718571, JP)
Application Number:
JP2010/062990
Publication Date:
February 02, 2012
Filing Date:
July 27, 2010
Export Citation:
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Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA (1 Toyota-cho, Toyota-shi, Aichi 71, 〒4718571, JP)
トヨタ自動車株式会社 (〒71 愛知県豊田市トヨタ町1番地 Aichi, 〒4718571, JP)
OKAZAKI Shuntaro (1 Toyota-ch, Toyota-shi Aichi 71, 〒4718571, JP)
International Classes:
F02D41/14; F02D41/22; F02D43/00; F02D45/00
Foreign References:
JP2009162139A
JP2009074388A
JP2009180145A
JP2007255355A
JP2003314334A
Attorney, Agent or Firm:
PROSPEC PATENT FIRM (12th Floor, NAGOYA-KS Building 1-18, Taiko 3-chome, Nakamura-ku, Nagoya-sh, Aichi 01, 〒4530801, JP)
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Claims: