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:
May. 18, 2010
Filed:
Jan. 09, 2008
Hideharu Takamiya, Saitama, JP;
Isao Komoriya, Saitama, JP;
Hideharu Takamiya, Saitama, JP;
Isao Komoriya, Saitama, JP;
Honda Motor Co., Ltd., Tokyo, JP;
Abstract
The present invention provides an intake air control capable of implementing a highly accurate constant negative pressure control with a smaller number of process steps under various environments. The intake air control is applicable to an engine having a variable valve actuation mechanism for adjusting at least a lift amount of an intake valve to control an intake air amount and a throttle valve for keeping a gauge pressure in an intake manifold at a desired gauge pressure. A reference throttle opening area is determined by referring to a first table based on a desired intake air amount. The first table defines a relation between an intake air amount and a throttle opening area under a reference gauge pressure, a reference atmospheric pressure and a reference intake air temperature. A throttle opening area for achieving the desired gauge pressure is determined by correcting the reference throttle opening area with a correction parameter derived based on the Bernoulli's law by using the desired gauge pressure, a current atmospheric pressure and a current intake air temperature.