초록

Disclosed herein is an enclosure for mounting one or more electronic units to a substrate, such as a printed circuit board.

대표청구항 ▼

Disclosed herein is an enclosure for mounting one or more electronic units to a substrate, such as a printed circuit board. onsive to said neutral position of said virtual spring, said virtual spring having a virtual spring force corresponding to a combination of a magnetic force generated by said e

Disclosed herein is an enclosure for mounting one or more electronic units to a substrate, such as a printed circuit board. onsive to said neutral position of said virtual spring, said virtual spring having a virtual spring force corresponding to a combination of a magnetic force generated by said electromagnet responsive to said current and a restoring spring force generated by said restoring spring. 12. The system of claim 11, further comprising an armature position sensor, wherein said electronic control unit is further configured, in determining said neutral position, to compare a position of said armature to said predetermined position. 13. The system of claim 11, wherein said electronic control unit is further configured, in determining said neutral position, to calculate said neutral position responsive to a velocity of said armature, a mass of said armature, a spring constant associated with said restoring spring, a desired position of said armature, and a predetermined threshold velocity of said armature at said desired position. 14. The system of claim 11 wherein said neutral position is restricted to a predetermined position range. 15. The system of claim 11 wherein electronic control unit determines said neutral position responsive to a desired position of said armature and a predetermined threshold velocity of said armature at said desired position. 16. The system of claim 11 wherein said electronic control unit is configured to determine said neutral position in accordance with the following equation: wherein m represents a mass of said armature, k represents a spring constant associated with said restoring spring, x(nT) represents a position of said armature, xdrepresents a desired position of said armature, vmaxrepresents a predetermined threshold velocity of said armature at said desired position, and va(nT) represents a velocity of said armature. 17. The system of claim 11 wherein said electronic control unit is further configured, in controlling said current, to determine said current in accordance with the following equation: wherein k represents a spring constant associated with said restoring spring, xvrepresents said neutral position of said virtual spring, xorepresents a neutral position of said restoring spring, xLrepresents a landing position of said armature against said pole face, x represents a current position of said armature, and ca,cbare constants. 18. The system of claim 11 wherein said electronic control unit is further configured to repeatedly determine said neutral position of said virtual spring and control said current responsive to said neutral position until said armature reaches a desired position. 19. The system of claim 11 wherein said electromagnetic actuator is used to control a fuel injector in an internal combustion engine. 20. The system of claim 11 wherein said electromagnetic actuator is used to control one of an intake valve and an exhaust valve in an internal combustion engine. 21. An article of manufacture, comprising: a computer storage medium having a computer program encoded therein for controlling movement of an armature towards a pole face of an electromagnet in an electromagnetic actuator, in which said armature moves toward said pole face against a force of a restoring spring when a coil of said electromagnet is charged with a current, said computer program including: code for determining a neutral position for a virtual spring after said armature reaches a predetermined position, said virtual spring having a virtual spring force corresponding to a combination of a magnetic force generated by said electromagnet responsive to said current and a restoring spring force generated by said restoring spring; and, code for controlling said current responsive to said neutral position of said virtual spring. 22. The article of manufacture of claim 21 wherein said code for determining a neutral position of said virtual spring includes code for comparing a position of said armature to a predetermine