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:
Dec. 13, 2005
Filed:
Apr. 20, 2005
Takayuki Shimatsu, Tochigi-ken, JP;
Shogo Hattori, Tochigi-ken, JP;
Takayuki Shimatsu, Tochigi-ken, JP;
Shogo Hattori, Tochigi-ken, JP;
Keihin Corporation, Tokyo, JP;
Abstract
An amount-of-air detecting time period Ti is preset based on an intake time period Tr during which intake air is actually drawn into a cylinder chamber. An intake air amount average value Qa during a time period, other than the time period Ti, between intake strokes is calculated. After confirmation that one half or more of an amount-of-air detecting time period Ti(n+1) has elapsed, an integrated value of the intake air amount is multiplied by a correcting coefficient Ka, and divided by the amount-of-air detecting time period Ti(n+1), thereby calculating an intake air amount Qin during the amount-of-air detecting time period Ti(n+1). The average value Qa of the intake air amount is subtracted from the amount Qin during the amount-of-air detecting time period Ti(n+1), thereby calculating an estimated amount Qp of intake air introduced into the cylinder chamber.