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. 18, 2002
Filed:
Jul. 11, 2000
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A fuel vapor purge system connects a fuel tank with a canister and collects fuel vapor generated in the fuel tank by the canister. The purge system purges the collected fuel vapor to an intake passage of an internal combustion engine through a purge passage. A change of pressure due to fuel vapor generation in the fuel tank is measured while the purge passage is sealed. The pressure in the purge passage is differentiated from the pressure outside the purge passage and the purge passage is sealed. In this state, a change of the pressure in the purge passage is measured. After measuring the amount of generated fuel vapor, a test for leakage in the purge passage is performed based on the change of pressure due to the fuel vapor generation when measuring changes of pressure in the purge passage during a predetermined period.