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:
Jun. 16, 1998
Filed:
Jul. 12, 1996
Nissan Motor Co., Ltd., Kanagawa, JP;
Abstract
A function diagnosing apparatus of an evaporative emission control system for an automotive vehicle executes a diagnosis when a diagnosis starting condition is satisfied. First, a purge cut valve and a vent cut valve are closed, and a bypass valve for a one way valve disposed between a fuel tank and a canister is opened. When a pressure in a purging line is not raised up by these valve operations, it is decided that the system goes wrong due to one of of the bypass valve in a cold condition, fuel vapor leakage, of the vent cut valve in an open condition, and/or no vapor existence. Upon opening the vent cut valve, it is decided as to whether the purge line pressure is dropped or not. When the purge line pressure is dropped, it is decided that the vent cut valve is normal. When the purge line pressure is not dropped, it is decided that vent cut valve is sticking closed.