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EP1029158A1 - Device for controlling a gas shuttle valve for internal combustion engines - Google Patents

Device for controlling a gas shuttle valve for internal combustion engines

Info

Publication number
EP1029158A1
EP1029158A1 EP99916743A EP99916743A EP1029158A1 EP 1029158 A1 EP1029158 A1 EP 1029158A1 EP 99916743 A EP99916743 A EP 99916743A EP 99916743 A EP99916743 A EP 99916743A EP 1029158 A1 EP1029158 A1 EP 1029158A1
Authority
EP
European Patent Office
Prior art keywords
valve
high pressure
pressure
valve member
gas exchange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP99916743A
Other languages
German (de)
French (fr)
Other versions
EP1029158B1 (en
Inventor
Udo Diehl
Karsten Mischker
Rainer Walter
Stefan Franzl
Volker Beuche
Stefan Reimer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1029158A1 publication Critical patent/EP1029158A1/en
Application granted granted Critical
Publication of EP1029158B1 publication Critical patent/EP1029158B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L9/00—Valve-gear or valve arrangements actuated non-mechanically
    • F01L9/10—Valve-gear or valve arrangements actuated non-mechanically by fluid means, e.g. hydraulic

Definitions

  • the invention is based on a device for controlling a gas exchange valve for internal combustion engines according to the preamble of claim 1.
  • a piston-shaped valve member is axially displaceably guided in a housing, the valve member having a plate-shaped valve sealing surface at its end near the combustion chamber, with which it has a valve seat fixed to the housing for controlling an inlet or outlet cross section cooperates on the combustion chamber of the internal combustion engine to be supplied.
  • the valve member At its shaft end remote from the combustion chamber, the valve member has a hydraulic piston which separates two hydraulic working spaces from one another in the axial direction, of which a lower, combustion chamber near the combustion chamber acts on the valve member of the gas exchange valve in the closing direction and an upper, combustion chamber distant combustion chamber acts on the valve member in the opening direction.
  • the lower work area is constantly connected to a high-pressure source via a high-pressure supply line and is thus subjected to high pressure.
  • the upper work space is contained via an electrical control valve High pressure supply line and a relief line containing a further electrical control valve can be alternately filled with high pressure and relieved.
  • the gas exchange valve is now actuated by the controlled filling of the upper work chamber, with a pressure medium of high pressure flowing into the upper work chamber in the open control valve in the high-pressure supply line, the force engagement surface on the piston of the valve member of the gas exchange valve being greater than the force application surface in the lower work chamber, so that the
  • High pressure supply line and the relief line at the upper working space of the gas exchange valve member possible to realize different opening positions and to move the gas exchange valve member back to its valve seat by opening the control valve in the relief line.
  • Valve member can remain in its open valve member position in the event of a failure of the pressure supply system, so that there is a risk that the gas exchange valve member collides with the piston of the internal combustion engine in its top dead center position. This can lead to blocking of the entire valve train and to the most severe mechanical damage to the internal combustion engine itself and, in addition, impairs the safety of the vehicle occupants due to the possible blocking of the drive axles on the driven motor vehicle.
  • the device according to the invention for controlling a gas exchange valve for internal combustion engines with the characterizing features of claim 1 has the advantage over the prior art that a hydraulically actuated valve actuator concept is made available that also in the event of a failure of the pressure supply device or the electrical control of the
  • Control valves reliably prevents the gas exchange valve member from remaining in the open position and ensures that the valve member is returned to its closed position.
  • three mutually independent security measures are proposed according to the invention, which can be implemented individually, but for security reasons only represent an optimal security concept when used together.
  • a first measure is implemented according to the invention in that the electrical control valves in the
  • Opening position two mutually independent actions are necessary, namely the active closing of the electrical control valve in the relief line and the opening of the electrical control valve in the high pressure supply line. Since the work chamber responsible for the closing movement of the valve member of the gas exchange valve is permanently connected to the high-pressure supply line, there is no electrical component in the path responsible for the closing that can fail.
  • the electrical control valves are advantageously designed as solenoid valves which are controlled by an electrical control device as a function of operating parameters of the internal combustion engine to be supplied.
  • Another possibility according to the invention for displacing the gas exchange valve member into its closed position in the event of the control device failing is achieved by providing an emergency store which is connected directly to the lower hydraulic work space responsible for the closing movement.
  • This emergency storage space which is preferably designed as a spring accumulator, only stores as much volume of high-pressure medium as is required to move the gas exchange valve member into its closed position.
  • a further working memory can be provided on the valve control device, which is also preferably designed as a spring pressure accumulator and which is used in particular for Maintaining a predetermined stand pressure in the control device is used.
  • This working pressure accumulator should preferably compensate for a possible loss of leakage when the internal combustion engine to be supplied is switched off and maintain a static pressure which ensures a safe function of the control device as soon as the internal combustion engine starts operating. Furthermore, the working pressure accumulator smoothes the pressure fluctuations in the system during operation, so that the working pressure accumulator requires a greater restoring moment than the emergency storage space and therefore has a higher spring force than the emergency storage space, so that both spring accumulators operate at different pressure levels.
  • a check valve is also provided in a high-pressure supply line from a pressure supply device, which is in the direction
  • Gas exchange valve member opens, and the pressure accumulator and a branch line are connected downstream in the lower working chamber in the flow direction.
  • Another check valve is advantageously inserted into the relief line.
  • a further measure for the safe resetting and for holding the gas exchange valve member in the non-critical closed position is achieved by the provision of a mechanically acting return element, preferably an emergency spring on the gas exchange valve member, which, in the event of failure of the entire pressure supply system and a pressure drop, also in the hydraulic working spaces on the piston of the valve member returns to its closed position.
  • This emergency spring is preferably designed as a compression spring, which in the lower hydraulic work chamber responsible for the closing movement of the valve member is used and engages there in the closing direction on the valve member piston.
  • the spring is just dimensioned so that it can overcome the frictional forces in the actuator under all conditions and can move the gas exchange piston from any position into the safe closed position.
  • the proposed control system for a gas exchange valve for internal combustion engines thus ensures that the gas exchange valve member is reliably pushed back into its closed position even if the control system fails, so that a collision of the gas exchange valve member with the piston of the internal combustion engine can be reliably avoided.
  • Figure 1 shows a schematic representation of a
  • Embodiment of the control device in which, in addition to the working pressure accumulator, an emergency pressure accumulator is also connected to the lower working space of the actuating piston and in which all of the proposed
  • the device for controlling a gas exchange valve for internal combustion engines shown schematically in FIG. 1, has a gas exchange valve 1 for controlling an inlet or outlet cross section on a combustion chamber of an internal combustion engine, not shown in any more detail.
  • Gas exchange valve 1 has a valve member 5 which is axially displaceable in a housing 3 and has a valve sealing surface 7 on its lower, plate-shaped end on the combustion chamber side, with which it cooperates with a valve seat surface 8 on the housing of the internal combustion engine to control an opening cross section.
  • the valve member 5 At its upper end facing away from the combustion chamber, the valve member 5 has a cross-sectional widening, forming a piston 9, with which the valve member 5 axially separates two hydraulic working chambers in the housing 3.
  • a hydraulic work chamber 11 located at the bottom, close to the combustion chamber, acts on the valve member 5 on a lower piston ring end face 13 in the closing direction of the gas exchange valve 1.
  • An overhead work chamber 15 remote from the combustion chamber acts on the downward opening
  • Valve member 5 in the opening direction, the pressure in the upper working chamber 15 acting on the entire upper piston face 17.
  • a pressure supply device For supplying pressure to the control device with a pressure medium of high pressure, a pressure supply device is also provided, which in the exemplary embodiment is formed by a regulated high pressure pump 19 which conveys the pressure medium, preferably oil, from a reserve 21 into a high pressure supply line 23.
  • the high-pressure pump 19 can be regulated on the suction side or on the pressure side.
  • a pressure storage space as a high-pressure medium source, from which a large number of high-pressure supply lines to the individual Remove control devices of the individual gas exchange valves.
  • a branch line 25 branches off from the high-pressure supply line 23 on the control device and opens into the lower hydraulic working space 11.
  • the original part of the high-pressure supply line 23 opens into the upper hydraulic working space 15, with a first electrical one between the branch into the branch line 25 and the confluence with the upper working space 15
  • Control valve 27 is inserted into the high pressure supply line 23. Furthermore, a working pressure accumulator 29 is inserted in the flow direction upstream of the first control valve 27 in the high pressure supply line 23, which is designed as a spring pressure accumulator. In order to ensure a predetermined stand pressure in the high-pressure supply line 23 and the branch line 25 connected to it and to avoid the outflow of pressure medium from these lines in the event of an accident, a check valve 31 is also in the direction of flow before the branching into the branch line 25, the working pressure accumulator 29 and the like first control valve 27 inserted into the high pressure supply line 23.
  • Relief line 33 which opens into the reservoir 21 and into which a second electrical control valve 35 is inserted, through which the relief line 33 can be closed.
  • a check valve 36 opening in the direction of the reservoir 21 is inserted into the relief line 33.
  • the lower working space 11 is also connected to an emergency pressure accumulator 37.
  • This designed as a spring pressure accumulator 37 is dimensioned so that after reaching the detection threshold for the drop in the supply pressure and including the closing losses of the check valve 31 there is still enough pressure and volume for the closing process of the actuator in the pressure accumulator.
  • the function of the emergency pressure accumulator 37 can be integrated into the control device according to the invention in addition to the working pressure accumulator 29, but it is alternatively also possible to take over the emergency pressure accumulator function through the working pressure accumulator 29 or to provide only the emergency pressure accumulator 37 on the control system.
  • the working pressure accumulator 29 and the emergency pressure accumulator 37 work together at different pressure levels, the working pressure accumulator 29 working with a higher restoring torque at a higher pressure level. In addition to maintaining the residual pressure, the working pressure accumulator 29 also takes on the task of smoothing the working pressure so that undesired pressure fluctuations in the system can be compensated for.
  • the different pressure levels at the spring accumulators of the two pressure accumulators 29, 37 are set by different return springs, the spring of the emergency pressure accumulator 37 having the lower spring force.
  • an emergency closing spring 39 is also required in lower work space 11 used.
  • This emergency closing spring 39 is designed as a compression spring which is clamped between a lower housing shoulder and the lower piston ring end face 13 and which thus acts on the valve member 5 of the gas exchange valve 1 in the closing direction.
  • This emergency spring 39 is dimensioned so strong that it can overcome the frictional moments in the gas exchange valve under all conditions and can move the piston 9 on the valve member 5 from any actuator position into the closed position.
  • the device according to the invention for controlling a gas exchange valve of an internal combustion engine works in the following way.
  • the high-pressure pump 19 which is preferably driven by the latter, pumps a pressure medium, preferably oil, under high pressure into the high-pressure supply line 23.
  • This high-pressure passes via the check valve 31 and the continuously open branch line 25 into the lower hydraulic working chamber 11, which in the process holds the valve member 5 in its upward closed position via the lower piston ring end face 13.
  • the electrical control valves 27 and 35 are de-energized, the first control valve 27 closing the high-pressure supply line 23 in the upper working space 15.
  • the second control valve 35 is open when de-energized, so that the relief line 33 leading away from the upper working chamber 15 is opened into the pressure medium reserve 21. In this way, the valve member 5 is pressed against its valve seat 8 by the pressure in the lower working chamber 11. Only the ambient pressure is present in the upper pressure chamber 15.
  • the first control valve 27 is energized in the high-pressure supply line 23 and thus opened, while the second control valve 35 by Energized is locked.
  • the pressure medium now flows into the upper working space 15. Since the upper pressure surface 17 of the piston 9 is larger than the lower pressure surface 13 and the pressure in both working spaces 15, 11 is approximately the same, the resulting pressure force now displaces the valve member 5 of the gas exchange valve 1 down to its open position.
  • the opening cross section of the gas exchange valve is opened by lifting the valve sealing surface 7 from the valve seat 8 on the housing.
  • the control valve 27 is closed and thus the supply of pressure medium in the upper working space 15 is interrupted.
  • the gas exchange valve member 5 comes to a standstill when the resultant of the pressure forces in the working spaces 11 and 15 is zero in cooperation with the restoring forces on the valve member 5.
  • the electrical control valves 27 and 35 which are preferably designed as a solenoid valve, all valve opening positions can be set as a function of operating parameters of the internal combustion engine by means of an electrical control device.
  • the second control valve 35 in the relief line 33 is opened while the first control valve 27 is still closed.
  • the pressure in the upper working space 15 drops to almost the ambient pressure level, while the high system pressure is still present in the lower working space 11.
  • the piston 9 and thus the valve member 5 of the gas exchange valve 1 is again moved into the closed position by the resulting force and pressed into the valve seat 8 with the valve sealing surface 7 .
  • the idle state is thus reached again and a new one Working cycle can take place.
  • the high pressure medium remains in the pressure line system downstream of the check valve 31 in the lower working chamber 11.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

A device for controlling a gas shuttle valve for internal combustion engines, comprising an axially displaceable valve member (5) with a sealing surface (7) that enables it to co-operate with a valve seat (8) fixed to the housing. The valve member has a piston (9) on the end that is far from the combustion chamber. Two hydraulic working areas are axially separated by the piston. A lower working area (11) close to the combustion chamber acts upon the valve member (5) in the direction of closing and an upper working area far from combustion chamber (15) acts upon it in the direction of opening. The lower working area (11) is permanently connected to a high pressure source and the upper working area can be alternately filled with high pressure and discharged by means of a high pressure feed line (23) containing an electric control valve (27) and a discharge line (33) containing an electric control valve (27). The electric control valve (35) closes the high pressure feed line (23) into the upper working area (15) at zero current, while the control valve (35) in the discharge line (33) is opened at zero current.

Description

Vorrichtung zur Steuerung eines Gaswechselventils für Brennkraf maschinenDevice for controlling a gas exchange valve for internal combustion engines
Stand der TechnikState of the art
Die Erfindung geht von einer Vorrichtung zur Steuerung eines Gaswechselventils für Brennkraftmaschinen nach der Gattung des Patentanspruchs 1 aus. Bei einer derartigen aus der Schrift DE 195 11 320 bekannten SteuerungsVorrichtung ist ein kolbenförmiges Ventilglied axial verschiebbar in einem Gehäuse geführt, wobei das Ventilglied an seinem brennraumnahen Ende eine tellerförmige Ventildichtfläche aufweist, mit der es mit einem gehäusefesten Ventilsitz zur Steuerung eines Einlaß- bzw. Auslaßquerschnittes am Brennraum der zu versorgenden Brennkraftmaschine zusammenwirkt. An seinem brennraumfernen Schaftende weist das Ventilglied einen hydraulischen Kolben auf, der in Achsrichtung zwei hydraulische Arbeitsräume voneinander trennt, von denen ein unterer, brennraumnaher Arbeitsraum das Ventilglied des Gaswechselventils in Schließrichtung und ein oberer, brennraumferner Arbeitsraum das Ventilglied in Öffnungsrichtung beaufschlagt. Dabei ist der untere Arbeitsraum über eine Hochdruckzuführungsleitung ständig mit einer Hochdruckquelle verbunden und somit mit Hochdruck beaufschlagt. Der obere Arbeitsraum ist über eine ein elektrisches Steuerventil enthaltene Hochdruckzuführungsleitung und eine ein weiteres elektrisches Steuerventil enthaltene Entlastungsleitung wechselnd mit Hochdruck befüllbar und entlastbar. Das Gaswechselventil wird nunmehr durch das gesteuerte Befullen des oberen Arbeitsraumes betätigt, wobei bei geöffnetem Steuerventil in der Hochdruckzuführungsleitung ein Druckmittel hohen Druckes in den oberen Arbeitsraum einströmt, dessen Kraftangriffsfläche am Kolben des Ventilgliedes des Gaswechselventiles größer ist als die Kraftangriffsfläche im unteren Arbeitsraum, so daß derThe invention is based on a device for controlling a gas exchange valve for internal combustion engines according to the preamble of claim 1. In such a control device known from DE 195 11 320, a piston-shaped valve member is axially displaceably guided in a housing, the valve member having a plate-shaped valve sealing surface at its end near the combustion chamber, with which it has a valve seat fixed to the housing for controlling an inlet or outlet cross section cooperates on the combustion chamber of the internal combustion engine to be supplied. At its shaft end remote from the combustion chamber, the valve member has a hydraulic piston which separates two hydraulic working spaces from one another in the axial direction, of which a lower, combustion chamber near the combustion chamber acts on the valve member of the gas exchange valve in the closing direction and an upper, combustion chamber distant combustion chamber acts on the valve member in the opening direction. The lower work area is constantly connected to a high-pressure source via a high-pressure supply line and is thus subjected to high pressure. The upper work space is contained via an electrical control valve High pressure supply line and a relief line containing a further electrical control valve can be alternately filled with high pressure and relieved. The gas exchange valve is now actuated by the controlled filling of the upper work chamber, with a pressure medium of high pressure flowing into the upper work chamber in the open control valve in the high-pressure supply line, the force engagement surface on the piston of the valve member of the gas exchange valve being greater than the force application surface in the lower work chamber, so that the
Kolben und mit ihm das Ventilglied in Öffnungsrichtung nach unten verschoben werden und so den Öffnungsquerschnitt am Ventilgliedsitz aufsteuern. Die Entlastungsleitung des oberen Arbeitsraumes ist währenddessen durch das zweite Steuerventil verschlossen. Es ist nunmehr durch das gezielte Ansteuern der Steuerventile in derPiston and with it the valve member are moved downwards in the opening direction and thus open the opening cross-section on the valve member seat. The relief line of the upper work area is closed by the second control valve. It is now due to the targeted activation of the control valves in the
Hochdruckzuführungsleitung und der Entlastungsleitung am oberen Arbeitsraum des Gaswechselventilgliedes möglich, verschiedene Öffnungsstellungen zu realisieren und das Gaswechselventilglied durch Aufsteuern des Steuerventils in der Entlastungsleitung wieder auf seinen Ventilsitz zurückzubewegen .High pressure supply line and the relief line at the upper working space of the gas exchange valve member possible to realize different opening positions and to move the gas exchange valve member back to its valve seat by opening the control valve in the relief line.
Dabei weist die bekannte Steuerungsvorrichtung für Gaswechselventile jedoch den Nachteil auf, daß dasThe known control device for gas exchange valves, however, has the disadvantage that the
Ventilglied bei einem Ausfall des Druckversorgungssystems in seiner geöffneten Ventilgliedstellung verbleiben kann, so daß die Gefahr besteht, daß das Gaswechselventilglied mit dem Kolben der Brennkraftmaschine in dessen oberer Totpunktlage kollidiert. Dies kann zum Blockieren des gesamten Ventiltriebes und zu schwersten mechanischen Schäden an der Brennkraftmaschine selbst führen und beeinträchtigt zudem durch das mögliche Blockieren der Antriebsachsen am angetriebenen Kraftfahrzeug auch die Sicherheit der Fahrzeuginsassen. Vorteile der ErfindungValve member can remain in its open valve member position in the event of a failure of the pressure supply system, so that there is a risk that the gas exchange valve member collides with the piston of the internal combustion engine in its top dead center position. This can lead to blocking of the entire valve train and to the most severe mechanical damage to the internal combustion engine itself and, in addition, impairs the safety of the vehicle occupants due to the possible blocking of the drive axles on the driven motor vehicle. Advantages of the invention
Die erfindungsgemäße Vorrichtung zur Steuerung eines Gaswechselventils für Brennkraftmaschinen mit den kennzeichnenden Merkmalen des Patentanspruchs 1 hat demgegenüber den Vorteil, daß ein hydraulisch betätigbares Ventilstellerkonzept zur Verfügung gestellt wird, das auch bei einem Ausfall der Druckversorgungseinrichtung beziehungsweise der elektrischen Ansteuerung derThe device according to the invention for controlling a gas exchange valve for internal combustion engines with the characterizing features of claim 1 has the advantage over the prior art that a hydraulically actuated valve actuator concept is made available that also in the event of a failure of the pressure supply device or the electrical control of the
Steuerventile ein Verharren des Gaswechselventilgliedes in Öffnungsposition sicher vermeidet und eine Rückführung des Ventilgliedes in seine Schließlage gewährleistet. Dabei werden erfindungsgemäß drei voneinander unabhängige Sicherheitsmaßnahmen vorgeschlagen, die einzeln realisierbar sind, jedoch aus Sicherheitsgründen erst in gemeinsamer Anwendung ein optimales Sicherheitskonzept darstellen.Control valves reliably prevents the gas exchange valve member from remaining in the open position and ensures that the valve member is returned to its closed position. In this case, three mutually independent security measures are proposed according to the invention, which can be implemented individually, but for security reasons only represent an optimal security concept when used together.
Eine erste Maßnahme wird dabei erfindungsgemäß dadurch realisiert, daß die elektrischen Steuerventile in derA first measure is implemented according to the invention in that the electrical control valves in the
Hochdruckzuführungsleitung und in der Entlastungsleitung des oberen, die Öffnungsbewegung des Gaswechselventilgliedes bewirkenden Arbeitsraumes in stromlosem Zustand so geschaltet sind, daß der obere Arbeitsraum am Kolben des Gaswechselventilgliedes druckentlastet ist. Somit ist bei ständig mit der Hochdruckzuführungsleitung verbundenem unterem, in Schließrichtung auf das Gaswechselventilglied wirkenden Arbeitsraum gewährleistet, daß das Ventilglied in stromlosem Zustand der Steuerventile sicher in Anlage am Ventilsitz gehalten wird. Der für die Öffnungshubbewegung des Gaswechselventilgliedes zuständige hydraulische Arbeitsraum kann erst mit Bestromen der elektrischen Steuerventile mit Hochdruck gefüllt werden, so daß das Gaswechselventil nur bei einwandfrei funktionierenden Schaltventilen aufsteuerbar ist. Bei elektrischen Problemen zum Beispiel einem Kabelabfall zum Steller, Kurzschlüssen in den Ansteuerleitungen und so weiter genügt es, die Steuerventile beziehungsweise deren Ansteuerung stromlos zu schalten. Dabei ist es besonders vorteilhaft, daß für ein Bewegen des Gaswechselventilgliedes in die kritischeHigh-pressure supply line and in the relief line of the upper, the opening movement of the gas exchange valve work chamber are switched in the de-energized state so that the upper work space on the piston of the gas exchange valve member is relieved of pressure. Thus, with the lower working chamber permanently connected to the high-pressure supply line and acting on the gas exchange valve member in the closing direction, it is ensured that the valve member is held securely in contact with the valve seat when the control valves are de-energized. The hydraulic working chamber responsible for the opening stroke movement of the gas exchange valve member can only be filled with high pressure by energizing the electrical control valves, so that the gas exchange valve can only be opened when the switching valves are functioning properly. With electrical problems For example, a cable drop to the actuator, short-circuits in the control lines and so on, it is sufficient to de-energize the control valves or their control. It is particularly advantageous that for moving the gas exchange valve member in the critical
Öffnungsposition zwei voneinander unabhängige Aktionen notwendig sind, nämlich das aktive Schließen des elektrischen Steuerventils in der Entlastungsleitung und das Aufsteuern des elektrischen Steuerventils in der Hochdruckzuführungsleitung. Da der für die Schließbewegung des Ventilgliedes des Gaswechselventiles zuständige Arbeitsraum ständig mit der Hochdruckzuführungsleitung verbunden ist, befindet sich in dem für das Schließen verantwortlichen Pfad kein elektrisches Bauteil, das ausfallen kann.Opening position two mutually independent actions are necessary, namely the active closing of the electrical control valve in the relief line and the opening of the electrical control valve in the high pressure supply line. Since the work chamber responsible for the closing movement of the valve member of the gas exchange valve is permanently connected to the high-pressure supply line, there is no electrical component in the path responsible for the closing that can fail.
Die elektrischen Steuerventile sind dabei in vorteilhafter Weise als Magnetventile ausgebildet, die von einem elektrischen Steuergerät in Abhängigkeit von Betriebsparametern der zu versorgenden Brennkraftmaschine angesteuert werden.The electrical control valves are advantageously designed as solenoid valves which are controlled by an electrical control device as a function of operating parameters of the internal combustion engine to be supplied.
Eine weitere erfindungsgemäße Möglichkeit zur Verschiebung des Gaswechselventilgliedes in seine Schließstellung bei Ausfall der Steuereinrichtung wird durch das Vorsehen eines Notspeichers erreicht, der direkt mit dem unteren, für die Schließbewegung verantwortlichen hydraulischen Arbeitsraum verbunden ist. Dieser vorzugsweise als Federspeicher ausgebildete Notspeicherraum speichert dabei lediglich soviel Volumen an Hochdruckmittel, wie benötigt wird, um das Gaswechselventilglied in seine Schließposition zu verschieben. Darüber hinaus kann ein weiterer Arbeitsspeicher an der Ventilsteuerungsvorrichtung vorgesehen werden, der ebenfalls vorzugsweise als Federdruckspeicher ausgebildet ist und der insbesondere zur Aufrechterhaltung eines vorbestimmten Standdruckes in der Steuereinrichtung dient. Dabei soll dieser Arbeitsdruckspeicher vorzugsweises einen möglichen Leckageverlust während des Abstellens der zu versorgenden Brennkraftmaschine ausgleichen und einen Standdruck aufrechterhalten, der sofort mit Beginn des Betriebs der Brennkraftmaschine eine sichere Funktion der Steuerungseinrichtung gewährleistet. Desweiteren erfolgt durch den Arbeitsdruckspeicher ein Glätten der Druckschwankungen im System während des Betriebs, so daß der Arbeitsdruckspeicher ein stärkeres Rückstellmoment als der Notspeicherraum benötigt und daher gegenüber dem Notspeicherraum eine höhere Federkraft aufweist, so daß beide Federspeicher auf unterschiedlichen Druckniveaus arbeiten.Another possibility according to the invention for displacing the gas exchange valve member into its closed position in the event of the control device failing is achieved by providing an emergency store which is connected directly to the lower hydraulic work space responsible for the closing movement. This emergency storage space, which is preferably designed as a spring accumulator, only stores as much volume of high-pressure medium as is required to move the gas exchange valve member into its closed position. In addition, a further working memory can be provided on the valve control device, which is also preferably designed as a spring pressure accumulator and which is used in particular for Maintaining a predetermined stand pressure in the control device is used. This working pressure accumulator should preferably compensate for a possible loss of leakage when the internal combustion engine to be supplied is switched off and maintain a static pressure which ensures a safe function of the control device as soon as the internal combustion engine starts operating. Furthermore, the working pressure accumulator smoothes the pressure fluctuations in the system during operation, so that the working pressure accumulator requires a greater restoring moment than the emergency storage space and therefore has a higher spring force than the emergency storage space, so that both spring accumulators operate at different pressure levels.
Um ein Abströmen des Speicherdruckes in der Hochdruckversorgung der Steuereinrichtung zu vermeiden ist desweiteren ein Rückschlagventil m einer Hochdruckzuführungsleitung von einer Druckversorgungseinrichtung vorgesehen, das in RichtungIn order to avoid an outflow of the storage pressure in the high-pressure supply of the control device, a check valve is also provided in a high-pressure supply line from a pressure supply device, which is in the direction
Gaswechselventilglied öffnet, und dem die Druckspeicher und eine Zweigleitung in den unteren Arbeitsraum in Strömungsrichtung nachgeschaltet sind. Ein weiteres Rückschlagventil ist in vorteilhafter Weise in die Entlastungsleitung eingesetzt .Gas exchange valve member opens, and the pressure accumulator and a branch line are connected downstream in the lower working chamber in the flow direction. Another check valve is advantageously inserted into the relief line.
Eine weitere Maßnahme zur sicheren Rückstellung und zum Halten des Gaswechselventilgliedes in der unkritischen Schließlage wird durch das Vorsehen eines mechanisch wirkenden Rückstellelementes, vorzugsweise einer Notfeder am Gaswechselventilglied erreicht, die bei Ausfall des gesamten Druckversorgungssystems und einem Druckabfall auch in den hydraulischen Arbeitsräumen am Kolben des Ventilgliedes dieses in seine Schließlage zurückführt. Dabei ist diese Notfeder vorzugsweise als Druckfeder ausgebildet, die in den unteren, für die Schließbewegung des Ventilgliedes verantwortlichen hydraulischen Arbeitsraum eingesetzt ist und dort in Schließrichtung am Ventilgliedkolben angreift. Die Feder ist gerade so dimensioniert, daß sie unter allen Bedingungen die Reibkräfte im Stellglied überwinden und den Gaswechselgliedkolben aus jeder Position heraus in die sichere Schließposition verschieben kann.A further measure for the safe resetting and for holding the gas exchange valve member in the non-critical closed position is achieved by the provision of a mechanically acting return element, preferably an emergency spring on the gas exchange valve member, which, in the event of failure of the entire pressure supply system and a pressure drop, also in the hydraulic working spaces on the piston of the valve member returns to its closed position. This emergency spring is preferably designed as a compression spring, which in the lower hydraulic work chamber responsible for the closing movement of the valve member is used and engages there in the closing direction on the valve member piston. The spring is just dimensioned so that it can overcome the frictional forces in the actuator under all conditions and can move the gas exchange piston from any position into the safe closed position.
Mit dem vorgeschlagenen Steuerungssystem für ein Gaswechselventil für Brennkraftmaschinen ist somit gewährleistet, daß auch bei einem Ausfall des Steuerungssystems das Gaswechselventilglied sicher in seine Schließlage zurückverschoben wird, so daß eine Kollision des Gaswechselventilgliedes mit dem Kolben der Brennkraftmaschine sicher vermieden werden kann.The proposed control system for a gas exchange valve for internal combustion engines thus ensures that the gas exchange valve member is reliably pushed back into its closed position even if the control system fails, so that a collision of the gas exchange valve member with the piston of the internal combustion engine can be reliably avoided.
Weitere Vorteile und vorteilhafte Ausgestaltungen des Gegenstandes der Erfindung sind der Beschreibung, den Patentansprüchen und der Zeichnung entnehmbar.Further advantages and advantageous configurations of the subject matter of the invention can be gathered from the description, the patent claims and the drawing.
Zeichnungdrawing
Ein Ausführungsbeispiel der erfindungsgemäßen Vorrichtung zur Steuerung eines Gaswechselventils für Brennkraftmaschinen ist in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert .An embodiment of the device according to the invention for controlling a gas exchange valve for internal combustion engines is shown in the drawing and explained in more detail in the following description.
Die Figur 1 zeigt eine schematische Darstellung einesFigure 1 shows a schematic representation of a
Ausführungsbeispiels der Steuerungsvorrichtung, bei der neben dem Arbeitsdruckspeicher auch ein Notdruckspeicher an den unteren Arbeitsraum des Stellkolbens angeschlossen ist und bei dem somit sämtliche vorgeschlagenenEmbodiment of the control device in which, in addition to the working pressure accumulator, an emergency pressure accumulator is also connected to the lower working space of the actuating piston and in which all of the proposed
Sicherheitseinrichtungen gezeigt sind.Safety devices are shown.
Beschreibung des Ausführungsbeispiels Die in der Figur 1 schematisch dargestellte Vorrichtung zur Steuerung eines Gaswechselventils für Brennkraftmaschinen weist ein Gaswechselventil 1 zur Steuerung eines Einlaßoder Auslaßquerschnittes an einem Brennraum einer nicht näher dargestellten Brennkraftmaschine auf. DasDescription of the embodiment The device for controlling a gas exchange valve for internal combustion engines, shown schematically in FIG. 1, has a gas exchange valve 1 for controlling an inlet or outlet cross section on a combustion chamber of an internal combustion engine, not shown in any more detail. The
Gaswechselventil 1 weist dabei ein in einem Gehäuse 3 axial verschiebbares Ventilglied 5 auf, das an seinem unteren, brennraumseitigen tellerförmigen Ende eine Ventildichtfläche 7 aufweist, mit der es zur Steuerung eines Öffnungsquerschnittes mit einer Ventilsitzfläche 8 am Gehäuse der Brennkraftmaschine zusammenwirkt . Das Ventilglied 5 weist an seinem oberen, brennraumabgewandten Ende eine, einen Kolben 9 bildende Querschnittserweiterung auf, mit der das Ventilglied 5 zwei hydraulische Arbeitsräume im Gehäuse 3 axial voneinander trennt. Dabei beaufschlagt ein unten liegender, brennraumnaher hydraulischer Arbeitsraum 11 das Ventilglied 5 an einer unteren Kolbenringstirnfläche 13 in Schließrichtung des Gaswechselventils 1. Ein oben liegender brennraumferner Arbeitsraum 15 beaufschlagt das nach unten öffnendeGas exchange valve 1 has a valve member 5 which is axially displaceable in a housing 3 and has a valve sealing surface 7 on its lower, plate-shaped end on the combustion chamber side, with which it cooperates with a valve seat surface 8 on the housing of the internal combustion engine to control an opening cross section. At its upper end facing away from the combustion chamber, the valve member 5 has a cross-sectional widening, forming a piston 9, with which the valve member 5 axially separates two hydraulic working chambers in the housing 3. In this case, a hydraulic work chamber 11 located at the bottom, close to the combustion chamber, acts on the valve member 5 on a lower piston ring end face 13 in the closing direction of the gas exchange valve 1. An overhead work chamber 15 remote from the combustion chamber acts on the downward opening
Ventilglied 5 in Öffnungsrichtung, wobei der Druck im oberen Arbeitsraum 15 an der gesamten oberen Kolbenstirnfläche 17 angreif .Valve member 5 in the opening direction, the pressure in the upper working chamber 15 acting on the entire upper piston face 17.
Zur Druckversorgung der Steuerungsvorrichtung mit einem Druckmittel hohen Druckes ist weiterhin eine Druckversorgungseinrichtung vorgesehen, die im Ausführungsbeispiel durch eine geregelte Hochdruckpumpe 19 gebildet wird, die das Druckmittel, vorzugsweise Öl aus einem Reservat 21 in eine Hochdruckzuführungsleitung 23 fördert. Die Hochdruckpumpe 19 kann dabei saugseitig oder druckseitig geregelt sein. Alternativ ist es auch möglich einen Druckspeicherraum als Hochdruckmittelquelle zu verwenden, von dem dann eine Vielzahl von Hochdruckzuführungsleitungen zu den einzelnen Steuerungsvorrichtungen der einzelnen Gaswechselventile abführen.For supplying pressure to the control device with a pressure medium of high pressure, a pressure supply device is also provided, which in the exemplary embodiment is formed by a regulated high pressure pump 19 which conveys the pressure medium, preferably oil, from a reserve 21 into a high pressure supply line 23. The high-pressure pump 19 can be regulated on the suction side or on the pressure side. Alternatively, it is also possible to use a pressure storage space as a high-pressure medium source, from which a large number of high-pressure supply lines to the individual Remove control devices of the individual gas exchange valves.
Von der Hochdruckzuführungsleitung 23 zweigt an der Steuerungsvorrichtung eine Zweigleitung 25 ab, die in den unteren hydraulischen Arbeitsraum 11 einmündet. Der ursprüngliche Teil der Hochdruckzuführungsleitung 23 mündet in den oberen hydraulischen Arbeitsraum 15, wobei zwischen der Abzweigung in die Zweigleitung 25 und die Einmündung in den oberen Arbeitsraum 15 ein erstes elektrischesA branch line 25 branches off from the high-pressure supply line 23 on the control device and opens into the lower hydraulic working space 11. The original part of the high-pressure supply line 23 opens into the upper hydraulic working space 15, with a first electrical one between the branch into the branch line 25 and the confluence with the upper working space 15
Steuerventil 27 in die Hochdruckzuführungsleitung 23 eingesetzt ist. Desweiteren ist ein Arbeitsdruckspeicher 29 in Strömungsrichtung vor dem ersten Steuerventil 27 in die Hochdruckzuführungsleitung 23 eingesetzt, der als Federdruckspeicher ausgebildet ist . Zur Gewährleistung eines vorbestimmten Standdruckes in der Hochdruckzuführungsleitung 23 und der mit dieser verbundenen Zweigleitung 25 und zum Vermeiden des Abströmens von Druckmittel aus diesen Leitungen im Falle einer Havarie ist weiterhin ein Rückschlagventil 31 in Strömungsrichtung vor die Verzweigung in die Zweigleitung 25, den Arbeitsdruckspeicher 29 und das erste Steuerventil 27 in die Hochdruckzuführungsleitung 23 eingesetzt .Control valve 27 is inserted into the high pressure supply line 23. Furthermore, a working pressure accumulator 29 is inserted in the flow direction upstream of the first control valve 27 in the high pressure supply line 23, which is designed as a spring pressure accumulator. In order to ensure a predetermined stand pressure in the high-pressure supply line 23 and the branch line 25 connected to it and to avoid the outflow of pressure medium from these lines in the event of an accident, a check valve 31 is also in the direction of flow before the branching into the branch line 25, the working pressure accumulator 29 and the like first control valve 27 inserted into the high pressure supply line 23.
Desweiteren führt vom oberen Arbeitsraum 15 eineFurthermore, leads from the upper work space 15
Entlastungsleitung 33 ab, die in das Vorratsreservoir 21 mündet und in die ein zweites elektrisches Steuerventil 35 eingesetzt ist, durch das die Entlastungsleitung 33 verschließbar ist. Um auch hier ein Leerströmen der Leitung 33 und des oberen Arbeitsraumes 15 zu vermeiden, ist weiterhin ein in Richtung Reservoir 21 öffnendes Rückschlagventil 36 in die Entlastungsleitung 33 eingesetzt.Relief line 33, which opens into the reservoir 21 and into which a second electrical control valve 35 is inserted, through which the relief line 33 can be closed. In order to avoid an empty flow of the line 33 and the upper working space 15 here, too, a check valve 36 opening in the direction of the reservoir 21 is inserted into the relief line 33.
Um bei einem Druckabfall im Hochdruckleitungssystem ein sicheres Rückkehren des Ventilgliedes 5 des Gaswechselventils 1 an seinen gehäusefesten Ventilsitz 8 zu gewährleisten, ist der untere Arbeitsraum 11 zudem mit einem Notdruckspeicher 37 verbunden. Dieser als Federdruckspeicher ausgebildete Notdruckspeicher 37 ist dabei so dimensioniert, daß nach dem Erreichen der Erkennungsschwelle für das Abfallen des Versorgungsdrucks und einschließlich der Schließverluste des Rückschlagventils 31 noch genügend Druck und Volumen für den Schließvorgang des Stellgliedes im Druckspeicher übrigbleibt. Dabei kann die Funktion des Notdruckspeichers 37 zusätzlich zum Arbeitsdruckspeicher 29 in die erfindungsgemäße Steuerungsvorrichtung integriert sein, es ist alternativ jedoch auch möglich, die Notdruckspeicherfunktion durch den Arbeitsdruckspeicher 29 mit zu übernehmen bzw. nur den Notdruckspeicher 37 am Steuersystem vorzusehen.To ensure a safe return of the valve member 5 of the pressure drop in the high pressure line system To ensure gas exchange valve 1 on its valve seat 8 fixed to the housing, the lower working space 11 is also connected to an emergency pressure accumulator 37. This designed as a spring pressure accumulator 37 is dimensioned so that after reaching the detection threshold for the drop in the supply pressure and including the closing losses of the check valve 31 there is still enough pressure and volume for the closing process of the actuator in the pressure accumulator. The function of the emergency pressure accumulator 37 can be integrated into the control device according to the invention in addition to the working pressure accumulator 29, but it is alternatively also possible to take over the emergency pressure accumulator function through the working pressure accumulator 29 or to provide only the emergency pressure accumulator 37 on the control system.
Der Arbeitsdruckspeicher 29 und der Notdruckspeicher 37 arbeiten beim gemeinsamen Vorsehen dabei auf unterschiedlichen Druckniveaustufen, wobei der Arbeitsdruckspeicher 29 mit einem höheren Rückstellmoment auf einem höheren Druckniveau arbeitet. Dabei übernimmt der Arbeitsdruckspeicher 29 neben dem Erhalt des Restdruckes auch die Aufgabe eines Glättens des Arbeitsdruckes, so daß unerwünschte Druckschwankungen im System ausgeglichen werden können. Die unterschiedlichen Druckniveaus an den Federspeichern der beiden Druckspeicher 29, 37 werden dabei durch unterschiedliche Rückstellfedern eingestellt, wobei die Feder des Notdruckspeichers 37 die geringere Federkraft aufweist . Um das Ventilglied 5 des Gaswechselventils 1 nach einer vollständigen Druckentlastung des Drucksystems durch eine geringe Leckage zum Beispiel bei längerem Abstellen der zu versorgenden Brennkraftmaschine, bei dem auch die Druckspeicher 29 und 37 entleert werden, in der Schließposition zu halten ist desweiteren eine Notschließfeder 39 in den unteren Arbeitsraum 11 eingesetzt. Diese Notschließfeder 39 ist dabei als Druckfeder ausgebildet, die zwischen einem unteren Gehäuseabsatz und der unteren Kolbenringstirnfläche 13 eingespannt ist und die somit das Ventilglied 5 des Gaswechselventils 1 in Schließrichtung beaufschlagt. Dabei ist diese Notfeder 39 gerade so kräftig dimensioniert, daß sie unter allen Bedingungen die Reibmomente im Gaswechselventil überwinden und den Kolben 9 am Ventilglied 5 aus jeder Stellgliedposition heraus in die Schließlage bewegen kann.The working pressure accumulator 29 and the emergency pressure accumulator 37 work together at different pressure levels, the working pressure accumulator 29 working with a higher restoring torque at a higher pressure level. In addition to maintaining the residual pressure, the working pressure accumulator 29 also takes on the task of smoothing the working pressure so that undesired pressure fluctuations in the system can be compensated for. The different pressure levels at the spring accumulators of the two pressure accumulators 29, 37 are set by different return springs, the spring of the emergency pressure accumulator 37 having the lower spring force. In order to keep the valve member 5 of the gas exchange valve 1 in the closed position after a complete pressure relief of the pressure system due to a slight leakage, for example when the internal combustion engine to be supplied is switched off for a longer period of time, in which the pressure accumulators 29 and 37 are also emptied, an emergency closing spring 39 is also required in lower work space 11 used. This emergency closing spring 39 is designed as a compression spring which is clamped between a lower housing shoulder and the lower piston ring end face 13 and which thus acts on the valve member 5 of the gas exchange valve 1 in the closing direction. This emergency spring 39 is dimensioned so strong that it can overcome the frictional moments in the gas exchange valve under all conditions and can move the piston 9 on the valve member 5 from any actuator position into the closed position.
Die erfindungsgemäße Vorrichtung zur Steuerung eines Gaswechselventils einer Brennkraftmaschine arbeitet in folgender Weise. Mit Beginn des Betriebs der Brennkraftmaschine fördert die von dieser vorzugsweise angetriebene Hochdruckpumpe 19 ein Druckmittel, vorzugsweise Öl unter hohem Druck in die Hochdruckzuführungsleitung 23. Dabei gelangt dieser Hochdruck über das Rückschlagventil 31 und die ständig geöffnete Zweigleitung 25 in den unteren hydraulischen Arbeitsraum 11, der dabei über die untere Kolbenringstirnfläche 13 das Ventilglied 5 in seiner nach oben gerichteten Schließlage hält. In Ruhe- beziehungsweise Schließposition des Gaswechselventils 1 sind dabei die elektrischen Steuerventile 27 und 35 stromlos geschaltet, wobei das erste Steuerventil 27 dabei die Hochdruckzuführungsleitung 23 in den oberen Arbeitsraum 15 verschließt. Das zweite Steuerventil 35 ist in stromlosem Zustand offengeschaltet, so daß die vom oberen Arbeitsraum 15 abführende Entlastungsleitung 33 in das Druckmittelreservat 21 geöffnet ist. Auf diese Weise wird das Ventilglied 5 durch den Druck im unteren Arbeitsraum 11 an seinen Ventilsitz 8 gepreßt. Im oberen Druckraum 15 liegt lediglich der Umgebungsdruck an. Um nunmehr das Gaswechselventil 1 zu öffnen wird das erste Steuerventil 27 in der Hochdruckzuführungsleitung 23 bestromt und somit geöffnet, während das zweite Steuerventil 35 durch ein Bestromen verschlossen wird. Dadurch strömt nunmehr das Druckmittel in den oberen Arbeitsraum 15. Da die obere Druckfläche 17 des Kolbens 9 größer ist als die untere Druckfläche 13 und der Druck in beiden Arbeitsräumen 15, 11 annähernd gleich ist, verschiebt nunmehr die resultierende Druckkraft das Ventilglied 5 des Gaswechselventils 1 nach unten in seine Öffnungsposition. Dabei wird durch das Abheben der Ventildichtfläche 7 vom Ventilsitz 8 am Gehäuse der Öffnungsquerschnitt des Gaswechselventils aufgesteuert. Um das Gaswechselventilglied 5 in einer bestimmtenThe device according to the invention for controlling a gas exchange valve of an internal combustion engine works in the following way. When the internal combustion engine begins to operate, the high-pressure pump 19, which is preferably driven by the latter, pumps a pressure medium, preferably oil, under high pressure into the high-pressure supply line 23. This high-pressure passes via the check valve 31 and the continuously open branch line 25 into the lower hydraulic working chamber 11, which in the process holds the valve member 5 in its upward closed position via the lower piston ring end face 13. In the rest or closed position of the gas exchange valve 1, the electrical control valves 27 and 35 are de-energized, the first control valve 27 closing the high-pressure supply line 23 in the upper working space 15. The second control valve 35 is open when de-energized, so that the relief line 33 leading away from the upper working chamber 15 is opened into the pressure medium reserve 21. In this way, the valve member 5 is pressed against its valve seat 8 by the pressure in the lower working chamber 11. Only the ambient pressure is present in the upper pressure chamber 15. In order to now open the gas exchange valve 1, the first control valve 27 is energized in the high-pressure supply line 23 and thus opened, while the second control valve 35 by Energized is locked. As a result, the pressure medium now flows into the upper working space 15. Since the upper pressure surface 17 of the piston 9 is larger than the lower pressure surface 13 and the pressure in both working spaces 15, 11 is approximately the same, the resulting pressure force now displaces the valve member 5 of the gas exchange valve 1 down to its open position. The opening cross section of the gas exchange valve is opened by lifting the valve sealing surface 7 from the valve seat 8 on the housing. To the gas exchange valve member 5 in a certain
Öffnungsposition zu fixieren, wird das Steuerventil 27 geschlossen und damit die Zufuhr von Druckmittel in dem oberen Arbeitsraum 15 unterbrochen. Das Gaswechselventilglied 5 kommt infolgedessen zum Stillstand wenn die Resultierende der Druckkräfte in den Arbeitsräumen 11 und 15 im Zusammenwirken mit den Rückstellkräften am Ventilglied 5 Null ist. Dabei lassen sich durch das gezielte Ansteuern der elektrischen Steuerventile 27 und 35, die vorzugsweise als Magnetventil ausgebildet sind, in Abhängigkeit von Betriebsparametern der Brennkraftmaschine mittels eines elektrischen Steuergerätes sämtliche Ventilöffnungspositionen einstellen.To fix the opening position, the control valve 27 is closed and thus the supply of pressure medium in the upper working space 15 is interrupted. As a result, the gas exchange valve member 5 comes to a standstill when the resultant of the pressure forces in the working spaces 11 and 15 is zero in cooperation with the restoring forces on the valve member 5. Through the targeted activation of the electrical control valves 27 and 35, which are preferably designed as a solenoid valve, all valve opening positions can be set as a function of operating parameters of the internal combustion engine by means of an electrical control device.
Um das Gaswechselventil 1 wieder zu schließen, wird bei weiterhin verschlossenem ersten Steuerventil 27 das zweite Steuerventil 35 in der Entlastungsleitung 33 geöffnet. Dadurch sinkt der Druck im oberen Arbeitsraum 15 auf nahezu Umgebungsdruckniveau, während im unteren Arbeitsraum 11 weiterhin der hohe Systemdruck anliegt. Da das Produkt aus Druck und Druckfläche im unteren Arbeitsraum 11 nunmehr größer ist als im oberen Arbeitsraum 15, wird der Kolben 9 und somit das Ventilglied 5 des Gaswechselventils 1 durch die resultierende Kraft erneut in Schließlage verschoben und mit der Ventildichtfläche 7 in den Ventilsitz 8 gepreßt. Der Ruhezustand ist somit wieder erreicht und ein neuer Arbeitszyklus kann erfolgen. Dabei verbleibt im sich stromabwärts an das Rückschlagventil 31 anschließenden Druckleitungssystem in den unteren Arbeitsraum 11 der Druckmittelhochdruck . In order to close the gas exchange valve 1 again, the second control valve 35 in the relief line 33 is opened while the first control valve 27 is still closed. As a result, the pressure in the upper working space 15 drops to almost the ambient pressure level, while the high system pressure is still present in the lower working space 11. Since the product of pressure and pressure area in the lower working chamber 11 is now larger than in the upper working chamber 15, the piston 9 and thus the valve member 5 of the gas exchange valve 1 is again moved into the closed position by the resulting force and pressed into the valve seat 8 with the valve sealing surface 7 . The idle state is thus reached again and a new one Working cycle can take place. The high pressure medium remains in the pressure line system downstream of the check valve 31 in the lower working chamber 11.

Claims

Patentansprüche claims
1. Vorrichtung zur Steuerung eines Gaswechselventils für Brennkraftmaschinen mit einem axial verschiebbaren Ventilglied (5), das an seinem brennraumnahen Ende eine Ventildichtfläche (7) aufweist, mit der es mit einem gehäusef sten Ventilsitz (8) zusammenwirkt und das an seinem brennraumfernen Ende einen Kolben (9) aufweist, der axial zwei hydraulische Arbeitsräume voneinander trennt, von denen ein unterer brennraumnaher Arbeitsraum (11) das Ventilglied (5) in Schließrichtung und ein oberer, brennraumferner Arbeitsraum (15) das Ventilglied (5) in Öffnungsrichtung beaufschlagt, wobei der untere Arbeitsraum (11) ständig mit einer Hochdruckquelle (19) verbunden ist und der obere Arbeitsraum (15) über eine ein elektrisches Steuerventil (27) enthaltene Hochdruckzuführungsleitung (23) und eine ein elektrisches Steuerventil (35) enthaltene Entlastungsleitung (33) wechselnd mit Hochdruck befüllbar und entlastbar ist, dadurch gekennzeichnet, daß das elektrische Steuerventil (27) in stromlosem Zustand die Hochdruckzuführungsleitung (23) in den oberen Arbeitsraum (15) verschließt und daß das elektrische Steuerventil (35) in stromlosem Zustand die Entlastungsleitung (33) aufgesteuert hält. 1.Device for controlling a gas exchange valve for internal combustion engines with an axially displaceable valve member (5) which has a valve sealing surface (7) at its end near the combustion chamber, with which it interacts with a housing valve housing (8) and which has a piston at its end remote from the combustion chamber (9), which axially separates two hydraulic work spaces from each other, of which a lower work space (11) near the combustion chamber acts on the valve member (5) in the closing direction and an upper work space (15) remote from the combustion chamber acts on the valve member (5) in the opening direction, the lower one Working space (11) is constantly connected to a high pressure source (19) and the upper working space (15) can be alternately filled with high pressure via a high pressure supply line (23) containing an electrical control valve (27) and a relief line (33) containing an electrical control valve (35) and can be relieved, characterized in that the electrical control valve (27) in st Closes the high pressure supply line (23) in the upper working chamber (15) in the de-energized state and that the electrical control valve (35) keeps the relief line (33) open when de-energized.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die elektrischen Steuerventile (27, 35) in der Hochdruckzuführungsleitung (23) und der Entlastungsleitung2. Device according to claim 1, characterized in that the electrical control valves (27, 35) in the high pressure supply line (23) and the relief line
(33) als Magnetventile ausgebildet sind, die von einem elektrischen Steuergerät in Abhängigkeit von(33) are designed as solenoid valves that are dependent on an electrical control unit
Betriebsparametern der zu versorgenden Brennkraftmaschine angesteuert werden.Operating parameters of the internal combustion engine to be supplied are controlled.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß eine Hochdruckquelle ein hydraulisches Arbeitsmedium unter3. Apparatus according to claim 1, characterized in that a high pressure source under a hydraulic working medium
Druck in die Hochdruckzuführungsleitung (23) fördert, von der in Strömungsrichtung vor dem elektrischen Steuerventil (27) eine Zweigleitung (25) in den unteren Arbeitsraum (11) abführt .Conveys pressure into the high-pressure supply line (23), from which a branch line (25) in the flow direction in front of the electrical control valve (27) leads into the lower working chamber (11).
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Hochdruckquelle als Pumpe, vorzugsweise als regelbare Hochdruckpumpe (19) ausgebildet ist.4. The device according to claim 3, characterized in that the high pressure source is designed as a pump, preferably as a controllable high pressure pump (19).
5. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß ein in Strömungsrichtung öffnendes Rückschlagventil (31) in Strömungsrichtung vor der Abzweigung der Zweigleitung (25) in die Hochdruckzuführungsleitung (23) eingesetzt ist.5. The device according to claim 3, characterized in that an opening in the flow direction check valve (31) is used in the flow direction before the branching of the branch line (25) in the high pressure supply line (23).
6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Hochdruckzuführungsleitung (23) mit einem vorzugsweise als Federspeicher ausgebildeten Arbeitsdruckspeicher (29) verbunden ist.6. The device according to claim 1, characterized in that the high pressure supply line (23) with a preferably designed as a spring accumulator working pressure accumulator (29) is connected.
7. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der untere Arbeitsraum (11) mit einem vorzugsweise als Federspeicher ausgebildeten Notdruckspeicher (37) verbunden ist. 7. The device according to claim 1, characterized in that the lower working space (11) with a preferably designed as a spring accumulator emergency pressure accumulator (37) is connected.
8. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß ein mechanisch wirkendes Rückstellglied, vorzugsweise eine Notfeder (39) am Gaswechselventil (1) vorgesehen ist, das das Gaswechselventilglied (5) in Richtung seiner Schließbewegung beaufschlagt und/oder in der Schließposition hält.8. The device according to claim 1, characterized in that a mechanically acting return member, preferably an emergency spring (39) is provided on the gas exchange valve (1) which acts on the gas exchange valve member (5) in the direction of its closing movement and / or holds in the closed position.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Notfeder (39) als Druckfeder ausgebildet ist, die im unteren Arbeitsraum (11) zwischen einem Gehäuseabsatz und dem Kolben (9) am Ventilglied (5) des Gaswechselventils (1) eingespannt ist. 9. The device according to claim 8, characterized in that the emergency spring (39) is designed as a compression spring which is clamped in the lower working space (11) between a housing shoulder and the piston (9) on the valve member (5) of the gas exchange valve (1).
EP99916743A 1998-06-12 1999-02-16 Device for controlling a gas shuttle valve for internal combustion engines Expired - Lifetime EP1029158B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19826047A DE19826047A1 (en) 1998-06-12 1998-06-12 Device for controlling a gas exchange valve for internal combustion engines
DE19826047 1998-06-12
PCT/DE1999/000427 WO1999066179A1 (en) 1998-06-12 1999-02-16 Device for controlling a gas shuttle valve for internal combustion engines

Publications (2)

Publication Number Publication Date
EP1029158A1 true EP1029158A1 (en) 2000-08-23
EP1029158B1 EP1029158B1 (en) 2003-11-12

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EP99916743A Expired - Lifetime EP1029158B1 (en) 1998-06-12 1999-02-16 Device for controlling a gas shuttle valve for internal combustion engines

Country Status (6)

Country Link
US (1) US6321703B1 (en)
EP (1) EP1029158B1 (en)
JP (1) JP2002518626A (en)
KR (1) KR100589297B1 (en)
DE (2) DE19826047A1 (en)
WO (1) WO1999066179A1 (en)

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Also Published As

Publication number Publication date
KR100589297B1 (en) 2006-06-14
US6321703B1 (en) 2001-11-27
DE19826047A1 (en) 1999-12-16
WO1999066179A1 (en) 1999-12-23
JP2002518626A (en) 2002-06-25
KR20010022808A (en) 2001-03-26
DE59907710D1 (en) 2003-12-18
EP1029158B1 (en) 2003-11-12

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