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:
Nov. 16, 2004
Filed:
Apr. 08, 2003
Noriyasu Amano, Gamagori, JP;
Hideaki Itakura, Nagoya, JP;
Naoya Kato, Ama-gun, JP;
Masao Kano, Gamagori, JP;
Other;
Abstract
An apparatus detects leak in a fuel vapor treatment system which is referred to as an evaporation system. The apparatus measures a required time T that is required for decreasing pressure in the evaporation system from P to P while opening a base leak hole that provides known amount of leak. Then, a required time T that is required for decreasing pressure from P to P is measured while closing the base leak hole. The apparatus compares the required times T and T in order to detect a leak other than the base leak hole. In this process, a specified coefficient that is defined in accordance with the base leak hole is taken into consideration. It is possible to detect the leak of the evaporation system with high accuracy even when the amount of remaining fuel is extremely large.