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. 04, 2016
Filed:
Jun. 06, 2012
Hideaki Ichihara, Obu, JP;
Hiroki Nogami, Kariya, JP;
Hiroshi Katsurahara, Okazaki, JP;
Hiroyuki Takezoe, Kariya, JP;
Hideaki Ichihara, Obu, JP;
Hiroki Nogami, Kariya, JP;
Hiroshi Katsurahara, Okazaki, JP;
Hiroyuki Takezoe, Kariya, JP;
DENSO CORPORATION, Kariya, JP;
Abstract
While an engine is an idling state and an EGR opening degree is increased stepwise from a specified opening degree, a variation in engine speed (a standard deviation in engine speed) is repeatedly computed. After that, a specified step amount is successively reduced from the EGR opening degree and the variation in engine speed is successively computed until the EGR opening degree becomes less than or equal to a specified value. Then, a maximum value of the EGR opening degrees where the variation in engine speed becomes minimum is learned as the full-close position.