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:
Oct. 16, 2001
Filed:
Jan. 27, 1999
Siemens Canada Limited, Mississauga, CA;
Abstract
An on-board evaporative emission leak detection system has a module (,) for detecting leakage from an evaporative emission space of a fuel system of an automotive vehicle. Interior space (,) of the module's enclosure (,) is communicated to atmosphere. A pump (,) is disposed within space (,) and has an inlet (,) communicated to the interior space and a flow passage (,) at its outlet (,) to allow the pump to create pressure in the evaporative emission space suitable for performance of a leak test. A vent valve (,) is disposed within space (,) and is selectively operable to vent and not vent the flow passage to space (,). An electromagnet actuator (,) has a single electric coil (,) that operates both the pump and the vent valve. A driver circuit (,) to the coil provides a first current component for operating the pump and a second current component for operating the vent valve.