DE10003116A1 - Valve control for internal combustion engines with an electro-magnetic actuator equipped with gas springs - Google Patents

Abstract

For a valve control for internal combustion engines with an electro-magnetic actuator equipped with gas springs, in which an armature is arranged to oscillate against the gas springs between a closing magnet and an opening magnet, it is proposed that the armature be used as a separating piston which is slidably movably arranged in a cylinder of the actuator Both gas springs are designed and metering valves and drain valves assigned to the gas springs are used to adjust adjusted spring characteristics in dependence on load ranges of the internal combustion engine, the drain valves additionally controlling a damped stop of the separating piston or armature against the closing magnet and serve against the opening magnet.

Description

The invention relates to a preamble of claim 1 Valve control for internal combustion engines with one equipped with gas springs electro-magnetic actuator, one with a gas exchange valve in the drive connecting armature between a closing magnet and an opening magnet is arranged oscillating against restoring forces of the gas springs, the gas springs separated from each other by means of the armature from a supercharger A gas can be measured via controllable valves and from the gas springs is triggered via controllable drain valves.

Such a valve control is known for example from US 5,611,303, the interaction of metering valves and drain valves with regard to a stroke adjustable actuator is tuned. This configuration also requires Formation of the gas springs in a tube arranged as a piston, the center of an anchor section is divided.

The invention has for its object to the generic valve control simple design so that variable spring characteristics in connection with controlled stroke damping can be achieved.  

This object is achieved with patent claim 1 in that the armature is designed as a separating piston arranged between two gas springs in a slidably movable manner in a cylinder of the actuator, and that the metering valves and the drain valves are controlled as a function of load ranges of the internal combustion engine serve to adjust adapted spring characteristics, the drain valves additionally serving to control a damped stop of the separating piston or armature against the closing magnet and against the opening magnet.

With the invention are advantageously dependent on a simple structure Spring characteristics that are variably adapted to the load ranges of the internal combustion engine achievable, a ge regardless of the respective spring characteristic controlled cushioning is reached.

With the electro-magnetic actuator according to the invention with pressure controlled be Actuable armature or separating piston with de-energized closing magnet and opening In an advantageous development of the invention, the magnet also results in the fact that the Separating piston or armature pressure-controlled when the internal combustion engine is switched off The closed position of the gas exchange valve is arranged, the at the closing separating pistons or anchors attached by means of permanent magnets on Closing magnet is held.

With the invention are advantageously when the internal combustion engine is turned off open gas exchange valves avoided, so that the internal combustion engine on due to the closed gas exchange valves has the known braking effect.

The invention is based on an embodiment shown schematically in the drawing Example described.

A valve control 1 for an internal combustion engine, not shown, comprises an actuator 2 with gas springs 3 , 4 , an armature 6 connected to a gas exchange valve 5 in drive between a closing magnet 7 and an opening magnet 8 against restoring forces of the gas springs 3 , 4 is arranged in an oscillating manner. The gas springs 3 and 4 each have a gas metered from a rechargeable memory 9 via lines 9 'and 9 "via controllable valves 10. Furthermore, gas is released from the gas springs 3 and 4 via controllable drain valves 11 .

To achieve variable spring characteristics in conjunction with a controlled shock absorption, it is proposed with a simple structure of the actuator 2 that the armature 6 is designed as a separating piston 13 slidably arranged in a cylinder 12 of the actuator 2 between the two gas springs 3 and 4 and that the metering Valves 10 and the drain valves 11 , depending on load ranges of the internal combustion engine, are used to adjust adjusted spring characteristics, the drain valves 11 additionally controlling a damped stop of the separating piston 13 or the armature 12 against the closing magnet 7 and against the opening magnet serve.

As known from DE 197 33 186 A1 per se, the armature 6 can also be actuated in a pressure-controlled manner in the actuator 2 according to the invention, even when the closing magnet and opening magnet are not energized. This can be used for an advantageous control of the actuator 2 such that the separating piston 13 or armature 12 is arranged in a pressure-controlled manner in the closed position of the gas exchange valve 5 when the internal combustion engine is switched off, the separating piston 13 attached to the closing magnet 7 being connected to the closing magnet 7 by means of a permanent magnet 14 is kept.

This can all in an advantageous manner when the internal combustion engine is turned off Gas exchange valves are brought into the closed position with the further advantage of Achieving a braking effect of the internal combustion engine for a vehicle.

Claims (2)

1. valve control for internal combustion engines with an electro-magnetic actuator equipped with gas springs,

• - In which a with a gas exchange valve ( 5 ) in drive connection armature ( 6 ) between a closing magnet ( 7 ) and an opening magnet ( 8 ) is arranged oscillating against restoring forces of the gas springs ( 3 , 4 ), wherein
• - The gas springs ( 3 , 4 ) separated from one another by means of the armature ( 6 ) from a rechargeable memory ( 9 ), a gas via controllable Ven tile ( 10 ) and
• - Gas is released from the gas springs ( 3 , 4 ) via controllable drain valves ( 11 ),

characterized by

• - That the armature ( 6 ) as a in a cylinder ( 12 ) of the actuator ( 2 ) slidably movably arranged separating piston ( 13 ) between the two gas springs ( 3 , 4 ) is formed, and
• - That the metering valves ( 10 ) and the drain valves ( 11 ) in dependence on load ranges from the internal combustion engine are used to adjust adjusted spring characteristics, wherein
• - The drain valves ( 11 ) also serve to control a damped stop of the separating piston ( 13 ) or the armature ( 12 ) against the closing magnet ( 7 ) and against the opening magnet ( 8 ).

2. Valve control according to claim 1, characterized in

• - That the separating piston ( 13 ) or armature ( 12 ) is arranged pressure-controlled when the internal combustion engine is switched off in the closed position of the gas exchange valve ( 5 ), wherein
• - the hinged at the closing magnet (7) separating piston (13) is held on the closing magnet (7) by means of a permanent magnet (14).