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. 20, 2018
Filed:
Oct. 07, 2014
Denso Corporation, Kariya, Aichi-pref., JP;
Hiroshi Katsurahara, Kariya, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
After off of an injection pulse of partial lift injection, a first filtered voltage Vsmbeing a negative terminal voltage of a fuel injection valve filtered by a first low-pass filter and a second filtered voltage Vsmbeing the negative terminal voltage of the fuel injection valve filtered by a second low-pass filter are calculated, and time from a predetermined reference timing to a timing when a difference Vdiff (=Vsm−Vsm) between the filtered voltages has an inflection point is calculated as voltage inflection time Tdiff. An averaged value Tdiff.ave of a predetermined frequency of data of the voltage inflection time Tdiff is obtained as a learning value of the voltage inflection time, and the injection pulse of the partial lift injection is corrected based on the learning value Tdiff.ave of the voltage inflection time.