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:
Jun. 07, 2005
Filed:
Feb. 17, 2004
Takefumi Uchida, Toyota, JP;
Harufumi Muto, Ann Arbor, MI (US);
Takefumi Uchida, Toyota, JP;
Harufumi Muto, Ann Arbor, MI (US);
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An electronic control unit of an internal combustion engine computes a remaining combusted gas amount M, which exists in a cylinder immediately before an intake valve is opened, based on an intake pipe pressure Pm, an engine speed NE, and an intake valve opening timing T. At the same time, the control unit computes a backflow combusted gas amount M, which is the amount of combusted gas that flows back into the cylinder from an exhaust pipe after the intake valve is opened, based on the intake pipe pressure Pm, the engine speed NE and a valve overlap amount OL. The control unit computes the sum of the remaining combusted gas amount Mand the backflow combusted gas amount M, and sets the sum as an estimated internal EGR amount M. As a result, the internal EGR amount is readily and accurately estimated.