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:
Aug. 03, 2004
Filed:
Feb. 21, 2001
Leak detection in a closed vapor handling system using a pressure switch, temperature and statistics
Laurent Fabre, Portet sur Garonne, FR;
Siemens Automotive S.A., , FR;
Abstract
A method of leak detection in a closed vapor handling system of an automotive vehicle, wherein an engine is shut off, implemented by a system, the method including obtaining a start temperature and start pressure, providing an evaluation temperature, calculating a temperature differential between the start temperature and the evaluation temperature, evaluating whether a pressure switch is closed if the temperature differential is greater than a temperature control value, incrementing a time counter if the pressure switch is not closed and comparing the time counter to a time control value if the pressure switch is not closed. The system includes a pressure switch, a temperature sensing element, and a processor operatively coupled to the pressure switch and the temperature sensing element and receiving, respectively, pressure and temperature signals therefrom, wherein the processor calculates a temperature differential between a start temperature and an evaluation temperature, evaluates whether the pressure switch is closed, increments a time counter, and compares the time counter to the time control value.