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:
Feb. 15, 2005
Filed:
Mar. 23, 2004
Katsuhiko Kawai, Nagoya, JP;
Katsuhiko Kawai, Nagoya, JP;
Denso Corporation, Kariya, JP;
Abstract
In an air-fuel ratio control system, a gain Kh is adaptively determined on the basis of a value z obtained by multiplying a target fuel amount difference value Δym (derivative value of a target fuel amount) by an error e between a target excess fuel ratio (target φ) and an actual excess fuel ratio (actual φ) detected by an air-fuel ratio sensor. A value obtained by multiplying the target fuel amount difference value Δym by the gain Kh is determined as an F/F corrected value ucmp. In this case, when the error e between the target φ and the actual φ is determined in consideration of the fact that a controlled system has dead time d, a target φd at the point in time going back in the past by the amount of the dead time d is used to obtain error e=target φd−actual φ.