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:
Jan. 18, 2005
Filed:
Jan. 07, 2002
Mohammad Haghgooie, Ann Arbor, MI (US);
Thomas William Megli, Dearborn, MI (US);
Yan Wang, Ann Arbor, MI (US);
Mohammad Haghgooie, Ann Arbor, MI (US);
Thomas William Megli, Dearborn, MI (US);
Yan Wang, Ann Arbor, MI (US);
Ford Global Technologies, LLC, Dearborn, MI (US);
Abstract
An electromagnetically operated valve assembly () has a first solenoid () and a second solenoid (). An armature () having a valve stem () coupled thereto is positioned between the first solenoid () and second solenoid (). A controller () is coupled to the first solenoid (), the second solenoid (). A current sensor () is coupled to the first solenoid and generated a signal corresponding to the induced current in the first solenoid. The controller () changes a voltage applied to the first solenoid from a first polarity to a second polarity. The controller () is further configured to hold the voltage at the second polarity for a predetermined time period and a predetermined amplitude to decrease the induced current. The predetermined time period or the predetermined amplitude is determined based on the first signal.