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:
Jul. 08, 2003
Filed:
May. 04, 2001
Carlo Rossi, Bologna, IT;
Alberto Tonielli, Imola, IT;
Magneti Marelli S.p.A., Milan, IT;
Abstract
A method and device for estimating magnetic flux in an electromagnetic actuator for controlling an engine valve, whereby the actuating body, made at least partly of ferromagnetic material, is moved towards at least one electromagnet by the force of magnetic attraction generated by the electromagnet; and the value of the magnetic flux through a magnetic circuit defined by the electromagnet and by the actuating body is estimated by measuring the values assumed by various electric quantities of an electric circuit connected to the magnetic circuit, calculating the time derivative of the magnetic flux as a linear combination of the values of the electric quantities, and integrating in time the derivative of the magnetic flux.