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. 23, 2007
Filed:
Nov. 02, 2005
Kenji Nagasaki, Nagoya, JP;
Tokiji Ito, Toyota, JP;
Hideki Miyahara, Nishikamo-gun, JP;
Denso Corporation, Kariya, Aichi-pref., JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, Aichi-pref., JP;
Abstract
A suction pump introduces negative pressure into a reference-pressure-detecting portion. A driving voltage V of the suction pump is adjusted in such a manner that pressure Pr in the reference-pressure-detecting portion is within a target pressure range. When the pressure Pr is brought into the target pressure range, the driving voltage V of the suction pump is stored as a first driving voltage Vand the pressure Pr is stored as a reference pressure Pr. When pressure detection and leak detection process are conducted, the suction pump is driven at the first driving voltage Vto introduce the negative pressure. The computer compares the pressure Pr with a leak determination value to determine whether a leak exists.