Method and device for estimating magnetic flux in an electromagnetic actuator for controlling an engine valve
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United States of America Patent
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Jul 8, 2003
Grant Date -
Jul 4, 2002
app pub date -
May 4, 2001
filing date -
May 4, 2000
priority date (Note) -
Expired
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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.
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