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:
May. 21, 2002
Filed:
May. 16, 2001
Magneti Marelli S.p.A., Milan, IT;
Abstract
Method for protection against overheating of electromagnetic actuators for actuation of intake and exhaust valves in internal-combustion engines, in which an actuator of an engine is connected to a respective intake or exhaust valve, and includes a mobile unit which is actuated magnetically, in order to control the movement of the said valve, and a first and a second electromagnet, which are disposed on opposite sides of the mobile unit; the actuator also being connected to a control unit, via a piloting circuit, which supplies at least one current to a current-measuring circuit, which supplies to the control unit measured values of the current. The method includes the steps of: estimating for each first and second electromagnet, a temperature value T which is updated on the basis of a present temperature value T and of the measured values of the current; checking whether the updated temperature value T is lower than a threshold; and implementing protective action, if the updated temperature value T is higher than the first threshold.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile