Internal-combustion engines – Poppet valve operating mechanism – Electrical system
Patent
1999-11-15
2000-12-26
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
Electrical system
123 9038, F01L 904
Patent
active
061642533
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for operating actuators for electromagnetic valve control in internal-combustion engines.
The actuators, which are embodied as a separate assembly, essentially comprise an opening magnet and a closing magnet, which are connected to one another by at least one housing part. The opening magnet and the closing magnet are electromagnets respectively comprising an exciter coil and a yoke. The exciter coils of the electromagnets are supplied with current by way of a plurality of contacts guided out of the housing part by a plug. A tie plate comprising a ferromagnetic substance is located between the opening magnet and the closing magnet. The tie plate is moved in the respective direction through the supply of the opening-magnet exciter coil or the closing-magnet exciter coil with current. The opening magnet has a lead-through for a plunger that connects the tie plate to an actuator spring plate. An actuator spring is disposed between the actuator spring plate and the housing part or the outside of the opening magnet.
An actuator and a cylinder valve form a functional unit, with the cylinder valve being drawn into the valve seat of the cylinder head by means of a valve spring and a valve spring plate, corresponding to a conventional cylinder head having cam shafts.
When a functional unit comprising an actuator and a cylinder valve is mounted to the internal-combustion engine, the actuator spring plate and the valve spring plate are pressed together. In the inoperative position of the functional unit, the tie plate is exactly in the center between the opening magnet and the closing magnet. The cylinder valve is located in a central position between the valve seat of the cylinder head, in which position the valve is closed, and the position in which the valve is at its maximum opening.
Because the power consumption of an actuator can be in the range of several hundred Watts, precautions must be taken to cool the actuators or carry off the unavoidable heat buildup.
The actuators are actuated by way of an actuator control device that controls the valve clearance of the internal-combustion engine by determining the beginning and duration of the current supply of the opening and closing magnets. To this end, the actuator control device requires sensor data for determining the crankshaft rpm and the crankshaft angle of rotation, for example.
At least two actuators are necessary for an internal-combustion engine employing two-valve technology and having one cylinder. In a four-valve internal-combustion engine having six cylinders, up to 24 actuators are integrated into a cylinder head.
It is the object of the invention to provide an apparatus for operating actuators for electromagnetic valve control in internal-combustion engines, in which the actuator arrangement is easily accessible for maintenance work, cooling is assured and the connection to the actuator control device is effected.
In accordance with the invention, this object is accomplished with the actuators being embodied as a discrete assembly for electromagnetic valve control and disposed in actuator shafts in an actuator carrier. An actuator control device that is connected to further control devices, engine sensors and the current supply is disposed on the actuator carrier.
The internal-combustion engine has a cylinder head, to which the actuator carrier is mounted, with non-positive lockup and in a form fit, as a separate assembly.
The actuator shafts in the actuator carrier are surrounded by cooling-medium channels that are connected to cooling-medium channels of the cylinder head, or to a cooling-medium circuit of the internal-combustion engine.
In a modification of the invention, it is provided that the further control devices are integrated into the actuator control device.
In a further modification of the invention, it is provided that the actuator carrier has a cover that surrounds the actuator control device; it may serve simultaneously as the logo plate of the engine manufacturer, and be made of plastic, for exa
REFERENCES:
patent: 4715330 (1987-12-01), Buchl
patent: 5255650 (1993-10-01), Faletti et al.
patent: 5720242 (1998-02-01), Izuo
patent: 5785016 (1998-07-01), Enderle et al.
Alberter Gunther
Baumel Hermann
Breu Gunther
Flierl Werner
Gramann Matthias
Daimler-Chrysler AG
Kinberg Robert
Lo Weilun
Spencer George H.
TEMIC Telefunken microelectronic GmbH
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