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:
Oct. 03, 2017
Filed:
Jan. 21, 2011
Kenji Nishida, Saitama, JP;
Kazuto Fukuzawa, Saitama, JP;
Tetsuya Kaneko, Saitama, JP;
Kenjiro Saito, Saitama, JP;
Kenji Nishida, Saitama, JP;
Kazuto Fukuzawa, Saitama, JP;
Tetsuya Kaneko, Saitama, JP;
Kenjiro Saito, Saitama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
In an alcohol concentration estimation apparatus for an engine, a first crank angular speed (ω) within a first predetermined interval overlapping with the compression top dead center is calculated, and a first variation amount (Δω) is calculated by subtracting ωfrom an average engine speed. A second crank angular speed (ω) within a second predetermined interval overlapping with the combustion bottom dead center is calculated, and a second variation amount (Δω) is calculated by subtracting ωfrom ω. In a relationship between air fuel ratio A/F and an indicated mean effective pressure (IMEP)/charging efficiency (ηc) of the engine when the engine is operated with a predetermined fuel injection map indicating a relationship between A/F and IMEP/ηc for each desired alcohol concentration, IMEP/ηc is substituted by Δωratio to estimate an alcohol concentration in fuel. The alcohol concentration estimation apparatus eliminates requirement of sensors for detecting an intake air mass.