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:
Aug. 08, 2006
Filed:
Feb. 28, 2005
Tomoyuki Kaga, Lafayette, CA (US);
Tomoyuki Kaga, Lafayette, CA (US);
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In an in-cylinder air amount estimation apparatus and an estimation method thereof, an average value of a pressure reduction amount that is an amount of reduction in a pressure in an intake pipe in plural opening/closing cycles is employed as a pressure reduction amount for calculating an excess air amount that is considered when an in-cylinder air amount is estimated, in order to suppress a decrease in accuracy. When it is determined that a ratio of a length of a pulsation cycle of the pressure in the intake pipe to a length of the sampling cycle is less than a predetermined level, the average value is obtained using an averaging method with high accuracy as compared to an ordinary method.