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. 16, 2007
Filed:
Oct. 14, 2004
Teruhiko Miyake, Susono, JP;
Shigeki Nakayama, Susono, JP;
Teruhiko Miyake, Susono, JP;
Shigeki Nakayama, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In an NOdischarge quantity estimation method for an internal combustion engine equipped with an EGR apparatus, the gas components (e.g., oxygen molecules and NO) of intake gas taken into a combustion chamber are assumed to be uniformly distributed throughout the entire region of the combustion chamber. Under such assumption, the combustion chamber is divided into a combustion region (region B) and a non-combustion region (region A) by making use of the ratio of the 'mass of oxygen consumed as a result of combustion' to the 'total mass of oxygen taken in the combustion chamber.' Further, under the assumption that NOgenerated as a result of combustion remains in the region B after combustion, and NOpresent in the region A before combustion due to circulation of EGR gas is conserved after combustion, the quantity of NOdischarged from the exhaust passage to the outside is calculated in consideration of not only the quantity of combustion-generated NOin the region B but also the quantity of circulated NOin the region A.