The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 15, 2011
Filed:
Nov. 06, 2008
Hideki Takubo, Chiyoda-ku, JP;
Hideki Takubo, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
A control apparatus for an internal combustion engine is provided which, even when a starting time of an alcohol concentration change varies, can accurately detect a starting time of an alcohol concentration estimation, and set a concentration estimation time matched to the behavior of the concentration change after determination of the start of the concentration change. An air fuel ratio correction amount calculation unit calculates an air fuel ratio correction amount based on an air fuel ratio detected by a sensor. An estimation permission determination unit determines that a starting condition for concentration estimation holds, when the correction amount becomes out of a predetermined range, and sets a permission time for concentration estimation in accordance with an accumulated amount of fuel injected after the starting condition for concentration estimation holds. A concentration estimation unit calculates an estimated concentration value based on the correction amount during permission of the concentration estimation.