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:
Jul. 29, 2025
Filed:
Nov. 22, 2021
Hitachi Astemo, Ltd., Hitachinaka, JP;
Ryutaro Koiwai, Hitachinaka, JP;
Osamu Mukaihara, Hitachinaka, JP;
Hitachi Astemo, Ltd., Hitachinaka, JP;
Abstract
A processor (CPU) of a control device (ECU) for an internal combustion engine identifies a first throttle valve opening degree θand a second throttle valve opening degree θat which a change rate (differential value) of an index (a deposit thickness, a decrease rate of an effective opening area, a flow rate decrease rate, and the like) correlated with a decrease rate of an effective opening area of a throttle valve changes (s). The processor (CPU) estimates an index at any throttle valve opening degree from the first throttle valve opening degree θand the second throttle valve opening degree θ(s), and calculates an effective opening area of the throttle valve from the estimated index (s).