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:
Apr. 25, 2000
Filed:
Mar. 06, 1998
Siemens Canada Limited, Mississauga, CA;
Abstract
A module for an on-board evaporative emission leak detection system that detects leakage from an evaporative emission space of a fuel system of an automotive vehicle. The module has a housing that includes a first port for communicating the housing to the evaporative emission space and a second port for communicating the housing to atmosphere. The housing contains a particulate filter through which the second port communicates with two parallel flow branches that extend within the housing to the first port. One branch contains a vacuum regulator valve, and the other, a solenoid-operated vent valve. During a leak detection test, the vent valve is operated closed, and a purge valve, that selectively communicates the evaporative emission space with the engine intake manifold, is operated open to cause vacuum to be drawn in the evaporative emission space. The vacuum regulator valve regulates evaporative emission space vacuum to a defined vacuum. Subsequently, the purge valve is operated closed. Leakage is evidenced by loss of vacuum, and a pressure sensor signals vacuum loss.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile