Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Reexamination Certificate
2000-12-26
2001-10-30
Lo, Weilun (Department: 3748)
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
C251S129160, C361S191000
Reexamination Certificate
active
06308668
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
A known regulating device (DE 33 07 070 C2) has an actuating element, which is embodied as a charge cycle valve, and an actuating drive. The actuating drive has two electromagnets between which an armature plate of an armature is mounted so as to be movable counter to the force of a restoring means. In order to start the regulating device, i.e. to move the armature from a static position of rest into a position of contact with one of the electromagnets, the coils of the electromagnets are excited in the vicinity of the natural frequency of the spring/mass system to oscillate with increasing amplitude. This method is, however, unreliable at very low temperatures (for example<−20° C.) and if the static position of rest of the armature is different from its geometric center position between the contact faces of the two electromagnets.
Summary of the Invention
It is accordingly an object of the invention to provide a method for starting an electromechanical regulating device which overcomes the above-mentioned disadvantages of the prior art methods of this general type, and which is independent of operating and ambient conditions.
With the foregoing and other objects in view there is provided, in accordance with the invention a method for starting an electromechanical regulating device. The method includes providing an electromechanical regulating device having an actuating element and an actuating drive; providing the actuating drive with a first electromagnet which has a contact face and a first coil; providing the actuating drive with a second electromagnet which has a contact face and a second coil; providing the actuating drive with an armature which can move between the contact face of the first electromagnet and the contact face of the second electromagnet; and providing the actuating drive with at least one restoring device which is mechanically coupled to the armature. The method includes defining a first position that is located separate from an open position and from a closed position on one of the contact faces. A first condition is defined as being satisfied if the armature has reached the first position; The second coil is energized until the first condition is satisfied. The first coil is energized from a time at which a second condition is fulfilled until the armature comes into contact with the contact face of the first electromagnet.
The invention is characterized in that first the second coil is energized until a first predefined condition is fulfilled, and then the first coil is energized from the time at which a second condition is fulfilled until the armature comes into contact with the contact face of the first electromagnet.
The advantages of the invention come into play in particular if the actuating element is embodied as an outlet valve of an internal combustion engine. The static position of rest of the armature is then advantageously adjusted from the geometric center position to the open position of the outlet valve. The outlet valve can thus be opened more easily counter to the forces of the gases in the cylinder of the internal combustion engine.
Other features which are considered as characteristic for the invention are set forth in the appended claims.
Although the invention is illustrated and described herein as embodied in a method for starting an electromechanical regulating device especially designed for controlling the charge cycle in an internal combustion engine, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.
The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
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patent: 5799630 (1998-09-01), Moriya et al.
patent: 5915347 (1999-06-01), Yanai et al.
patent: 6176208 (2001-01-01), Tsuzuki et al.
patent: 3307070C2 (1985-11-01), None
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Japanese Patent Abstract No. 11093711 (Toshio), dated Apr. 6, 1999.
Nitkiewicz James
Warnecke Volker
Zink Hanspeter
Greenberg Laurence A.
Lerner Herbert L.
Lo Weilun
Siemens Aktiengesellschaft AG
Stemer Werner H.
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