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:
Jan. 26, 2010
Filed:
Jun. 03, 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 can learn an alcohol concentration of fuel in a fuel tank according to air fuel ratio feedback control, and accurately calculate, even upon interruption of learning, an alcohol concentration in an injector by estimating an alcohol concentration change delay from the fuel tank to the injector. The alcohol concentration in the fuel tank is estimated based on an air fuel ratio correction amount calculated from an air fuel ratio detected. A delay behavior of an alcohol concentration change until the fuel in the fuel tank reaches the injector is estimated. The alcohol concentration of fuel supplied to the engine is calculated from the estimated alcohol concentration in the fuel tank and the estimated delay behavior. An alcohol concentration correction coefficient is calculated based on the alcohol concentration, and an amount of fuel supplied to the engine is corrected by the correction coefficient.