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. 30, 1995
Filed:
Nov. 30, 1993
Osamu Fukasawa, Obu, JP;
Hisashi Iida, Aichi, JP;
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A self-diagnosis apparatus and method for use in a fuel evaporative emission control system for a vehicle having an internal combustion engine. A space part of a fuel tank is coupled with an intake air passage via a vapor passage. Fuel vapors from the fuel tank pass through the vapor passage. A canister is provided in the vapor passage to absorb the fuel vapors from the fuel tank. The internal pressure of the space part of the fuel tank is detected by a pressure detecting unit. The quantity of change in the internal pressure during the lapse of a certain time period is calculated by a calculating unit. The internal pressure change quantity is compared with a predetermined reference value, and thus abnormality is judged by a judgement unit in accordance with the comparison result.