EP1656274B1 - Hydraulic drive system used for the covers of vehicle openings - Google Patents

Hydraulic drive system used for the covers of vehicle openings Download PDF

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Publication number
EP1656274B1
EP1656274B1 EP04763717A EP04763717A EP1656274B1 EP 1656274 B1 EP1656274 B1 EP 1656274B1 EP 04763717 A EP04763717 A EP 04763717A EP 04763717 A EP04763717 A EP 04763717A EP 1656274 B1 EP1656274 B1 EP 1656274B1
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EP
European Patent Office
Prior art keywords
roof
pump
actuator
drive system
hydraulic drive
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.)
Expired - Lifetime
Application number
EP04763717A
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German (de)
French (fr)
Other versions
EP1656274A1 (en
Inventor
Michael Stark
Reiner Hess
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.)
CTS Fahrzeug Dachsysteme GmbH
Original Assignee
CTS Fahrzeug Dachsysteme GmbH
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Publication date
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Publication of EP1656274A1 publication Critical patent/EP1656274A1/en
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Publication of EP1656274B1 publication Critical patent/EP1656274B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/26—Locking mechanisms
    • F15B15/262—Locking mechanisms using friction, e.g. brake pads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/04—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed
    • F15B11/046—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the speed depending on the position of the working member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
    • F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
    • F15B9/03—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type with electrical control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3144—Directional control characterised by the positions of the valve element the positions being continuously variable, e.g. as realised by proportional valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/632—Electronic controllers using input signals representing a flow rate
    • F15B2211/6326—Electronic controllers using input signals representing a flow rate the flow rate being an output member flow rate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/63—Electronic controllers
    • F15B2211/6303—Electronic controllers using input signals
    • F15B2211/6336—Electronic controllers using input signals representing a state of the output member, e.g. position, speed or acceleration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6654—Flow rate control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/60—Circuit components or control therefor
    • F15B2211/665—Methods of control using electronic components
    • F15B2211/6656—Closed loop control, i.e. control using feedback

Definitions

  • the invention relates to a hydraulic drive system for roofs of vehicles with an opening structure according to the preamble of claim 1.
  • a hydraulic drive system of the aforementioned type is known in which the roof kinematics in the body-side linkage is associated with a rotary drive.
  • This rotary drive comprises as actuator a hydraulic cylinder, the piston rod engages on the output side via an associated toothing in a rotatably connected to the roof kinematics drive pinion. Accordingly, the travel of the actuator correlates to the position of the roof kinematics adjustable roof or roof part, so that the respective roof or roof part position is to be detected by sensory detection of the travel of the actuator.
  • hydraulic systems for motor vehicles from the DE 41 04 805 A1 over which as "hydraulic Bordnetze" any number of consumers in the motor vehicle can be supplied with pressure medium.
  • consumers for example, air pump, water pump and steering system are addressed, which are driven in a common drive train of the internal combustion engine.
  • a separable via a clutch drive connection between the internal combustion engine and a hydraulic pump is provided, via which a branched hydraulic circuit is supplied, in which a branch line, a gear motor is used, which serves as a drive for an air compressor and a generator and the supply of the other branch line fast level control is running, the working cylinders are connected to this branch each with the interposition of a control module.
  • the driven by the internal combustion engine via the clutch pump is designed as a variable displacement pump and is controlled in the hydraulic system such that the level control is operated at substantially constant pressure and that, a further embodiment result, with lying in the inlet to the gear pump Proportional Flow control valve in the open position, the variable delivers a fixed volume flow.
  • Objective for the plant is to achieve an increased charging current of the generator and maximum cooling capacity of the air conditioning compressor at idle speed of the internal combustion engine in case of priority, if necessary, supply the level control.
  • To the "predetermined" working pressure corresponds to a power of the motor driving the pump and a current flowing through the motor current.
  • Deviations of the "actual" roof load from the “assumed” roof load result in disturbed motion sequence and cause changes in the current flowing through the motor, which is detected as a measured variable.
  • Deviations - e.g. a relation to the assumed roof load increased roof load when starting the roof against a stop position - so the associated pressure change by changing the engine power is taken into account.
  • the engine power is reduced in order to reduce the working pressure acting on the actuator and thus the restoring force counteracting the roof load.
  • the known solution also provides, inter alia, for using the amount of the working fluid flowing off the return of the hydraulic system as a measured variable, or also for working with a flow sensor, via which it is detected whether there is an inflow from the pump to the actuator. Depending on these values, the engine power of the motor driving the pump is changed and the working pressure corresponding to the pump power is reduced.
  • the supply unit comprises a main pump driven by the vehicle engine and an auxiliary pump.
  • the steering valve In the connection of the supply unit to the adjusting cylinders is the steering valve with connection to the tank, and the supply line is connected by the supply unit to one of these associated control and sensor valve.
  • this control and sensor valve By means of this control and sensor valve, by sensing the volume flow delivered by the main pump, the function of the main pump is monitored, and it becomes if the volume flow of the main pump drops below this limit, the auxiliary pump is connected to the supply line via the control and sensor valve.
  • the auxiliary pump merely circulates through the tank.
  • the auxiliary pump is thus included in such a steering system thus only in dependence on the size of the funded via the main pump flow in the supply of actuating cylinders and used for their supply.
  • the invention has for its object to form a hydraulic drive system of the type mentioned in that the roof and / or the roof parts individually as well as in relation to each other in their sequence of movements the specifications almost exactly, d. H. with negligible tolerances, follow.
  • the actuator volume flow is applied by detected by a volume flow sensor, the actual value of the actuator supplied volumetric flow, adjusted against the preset over the travel of the actuator volume flow as the desired value and the difference value via a Regulator is processed in the sense of a correction of the actual value, the volume flow is thus changed so that the actual value corresponds to the desired value.
  • Such a flow control can be achieved in a simple manner and by resorting to commercially available units, which can be avoided both by the mechanical movement caused as well as from the hydraulics, such as fluctuations in the delivery volume of the pump tolerances in the movement.
  • This is in accordance with the given in the flow control provision of a volume flow of the respective load to be supported, here the roof load, regardless is and corresponds to the desired, undisturbed movement sequence for the roof.
  • this can be done in that when provided as a volume flow source pump whose flow rate is adjusted by changing the pump speed and / or by changing the pump volume to the target value.
  • the processing of the actual values measured in the feed to the respective actuator via a respective volumetric flow sensor is expediently carried out in a controller by, based on the respective number of actuators, or the roof parts acted upon by these actuators in a corresponding assignment of the volumetric flow over the actuating path as desired value z.
  • B. is stored in curves or maps.
  • the Piston rod 3 in not shown drive connection, for example, to a pinion, which is associated with a non-rotatably connected to a drive arm of a roof kinematics of the roof shaft, so that by the adjusting movement of the actuator 1 carried on the kinematics roof or carried on the kinematics roof part is adjustable ,
  • a related example of this solution shows the DE 101 49 228 A
  • the actuator 1 can also, for the adjustment of two or more roof parts against each other, be provided in the kinematic connection of these roof parts, or as a drive between them.
  • the actuator 1 may be formed as a rotary actuator.
  • the actuator 1 is, as explained, in mechanical positive connection to be adjusted roof or roof part and it is accordingly assigned, based on the embodiment, the respective position of the connected to the piston rod 3 roof or roof part a specific position of the roof or roof part , Accordingly, the detection of the position of the piston rod 3 to the actuating cylinder 2 or to another corresponding fixed point, the corresponding position of the roof or the roof part can be detected.
  • the position of the actuator corresponding to the position of the roof or of the respective roof part is detected via its travel path via a measuring system 4, which, symbolically, is illustrated working with a resistance measuring device 5 which has a coil 6 and a position fixed to the piston rod 3 Grinding 7 includes.
  • the measuring system 4 is connected to the controller 8, via which the control of the volume flow source 9 takes place.
  • the volumetric flow source 9 may be formed, for example, by a hydraulic pump 10 and a downstream 3/4-way valve 11 as a proportional valve is formed and, according to its control, via the lines 12 or 13, the actuating cylinder 2 in the sense of the extension or retraction of the piston rod 3 acted upon.
  • the conduit 12 opens onto the working chamber 14 of the actuating cylinder 2 remote from the piston rod 3, and a volume flow sensor 15 of known construction is arranged in the conduit 12.
  • volume flow sensors are offered, for example, by IPM-Hydraulik für and detect the volume flow as a directly proportional to the opening stroke of an actuating cylinder size, which is supplied to the controller 8 as the actual value of the volume flow in the context of the drive system according to the invention.
  • the desired value of the volume flow which corresponds to the desired adjustment speed during the movement of the roof for the respective roof or the respective roof part, is detected and is supplied to the controller 8 against the actual value of the volume flow which is measured via the volume flow sensor 15. adjusted.
  • the volumetric flow source 9 is actuated, so that the actuator 1 is provided with a predetermined setpoint value and the roof or mutually adjustable roof parts are correspondingly positioned relative to one another or moved relative to the demarcating body parts.
  • the solution according to the invention makes it possible to control the roof or the roof parts in their adjustment speed to the body or against each other in a position-dependent manner, for example, to move faster and more quickly via intermediate adjustment paths against the end positions.
  • the respective predetermined positioning speed over the respective adjustment are stored so that both a total roof as well as for the roof parts of a segmented roof with appropriate separate drives a desired positionally accurate control is possible.
  • volumetric flow source in conjunction with a construction of pump 10 and proportional valve 11 in a simple manner allows the required supply of the respective desired and required volume flow. Basically, it is also within the scope of the invention to achieve the volume flow in the desired manner by a speed control of the pump 10, so that it may be possible to dispense with the formation of the downstream valve as a proportional valve 11.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

Die Erfindung betrifft ein hydraulisches Antriebssystem für Dächer von Fahrzeugen mit zu öffnendem Aufbau gemäß dem Oberbegriff des Anspruches 1.The invention relates to a hydraulic drive system for roofs of vehicles with an opening structure according to the preamble of claim 1.

Aus der DE 101 49 228 A ist für verstellbare Fahrzeugdächer ein hydraulisches Antriebssystem der vorgenannten Art bekannt, bei dem der Dachkinematik in der karosserieseitigen Anlenkung ein Drehantrieb zugeordnet ist. Dieser Drehantrieb umfasst als Aktuator einen Hydraulikzylinder, dessen Kolbenstange abtriebsseitig über eine zugeordnete Verzahnung in ein drehfest mit der Dachkinematik verbundenes Antriebsritzel eingreift. Dementsprechend korreliert der Stellweg des Aktuators zur Position des über die Dachkinematik verstellbaren Daches oder Dachteiles, so dass durch sensorische Erfassung des Stellweges des Aktuators die jeweilige Dach- oder Dachteilposition zu detektieren ist. Die Abfrage der aktuellen Position des Daches bzw. Dachteiles indirekt über die Erfassung des Stellweges des Aktuators, oder in entsprechender Weise auch anderer Teile der Drehantriebseinrichtung macht es möglich, in jeder Phase der Überführungsbewegung des Daches oder Dachteiles zwischen Schließ- und Ablagestellung die genaue Dach- bzw. Dachteilposition zu ermitteln und damit auch über die Beaufschlagung des Aktuators Einfluss auf die Verstellbewegung des Daches oder Dachteiles, inbesondere dessen Verstellgeschwindigkeit über dem Verstellweg zu nehmen. Geschwindigkeitsschwankungen, wie sie insbesondere in Abhängigkeit von der Gängigkeit des Systems beeinflussenden Faktoren, so vor allen Dingen Reibwertschwankungen auftreten können, bleiben dabei unberücksichtigt, so dass vor allem bei mehrteiligen Dachsystemen mit mehreren eigenständig angetriebenen Dachteilen bei den zu beachtenden engen Toleranzen in ihrem Bewegungsablauf Schwierigkeiten auftreten können.From the DE 101 49 228 A For adjustable vehicle roofs, a hydraulic drive system of the aforementioned type is known in which the roof kinematics in the body-side linkage is associated with a rotary drive. This rotary drive comprises as actuator a hydraulic cylinder, the piston rod engages on the output side via an associated toothing in a rotatably connected to the roof kinematics drive pinion. Accordingly, the travel of the actuator correlates to the position of the roof kinematics adjustable roof or roof part, so that the respective roof or roof part position is to be detected by sensory detection of the travel of the actuator. The query of the current position of the roof or roof part indirectly via the detection of the travel of the actuator, or in a similar manner also other parts of the rotary drive device makes it possible in each phase of the transfer movement of the roof or roof part between closing and storage position, the exact roof or roof part position to determine and thus to take over the actuation of the actuator influence on the adjustment of the roof or roof part, in particular its adjustment speed on the adjustment. Speed variations, as they can occur in particular depending on the system's ability to influence the system, so above all Reibwertschwankungen remain unconsidered, so that especially in multi-part roof systems with several independently driven roof parts at the observed close tolerances difficulties in their movement occur can.

Bekannt sind des Weiteren Hydraulikanlagen für Kraftfahrzeuge aus der DE 41 04 805 A1 , über die als "hydraulische Bordnetze" eine beliebige Anzahl von Verbrauchern im Kraftfahrzeug mit Druckmittel versorgt werden kann. Als solche Verbraucher sind beispielsweise Luftpumpe, Wasserpumpe und Lenkungsanlage angesprochen, die in einem gemeinsamen Antriebsstrang von der Brennkraftmaschine angetrieben sind. Ferner ist eine über eine Kupplung auftrennbare Antriebsverbindung zwischen der Brennkraftmaschine und einer Hydraulikpumpe vorgesehen, über die ein verzweigter Hydraulikkreis versorgt wird, in dessen einer Zweigleitung ein Zahnradmotor liegt, der als Antrieb für einen Klimakompressor und einen Generator dient und über dessen andere Zweigleitung die Versorgung der schnellen Niveauregelung läuft, deren Arbeitszylinder an diese Zweigleitung jeweils unter Zwischenschaltung eines Steuermoduls angeschlossen sind. Die von der Brennkraftmaschine über die Kupplung angetriebene Pumpe ist als Verstellpumpe ausgebildet und wird im Rahmen der Hydraulikanlage derart angesteuert, dass die Niveauregelung im Wesentlichen mit konstantem Druck betrieben wird und dass, einem weiteren Ausführungsbeispiel zur Folge, bei im Zulauf auf die Zahnradpumpe liegendem Proportional-Stromregelventil in dessen Offenstellung die Verstellpumpe einen festgelegten Volumenstrom liefert. Zielsetzung für die Anlage ist, bei im Bedarfsfall vorrangiger Versorgung der Niveauregelung einen erhöhten Ladestrom des Generators und maximale Kühlleistung des Klimakompressors bereits bei Leerlaufdrehzahl der Brennkraftmaschine zu erreichen.Further known are hydraulic systems for motor vehicles from the DE 41 04 805 A1 , over which as "hydraulic Bordnetze" any number of consumers in the motor vehicle can be supplied with pressure medium. As such consumers, for example, air pump, water pump and steering system are addressed, which are driven in a common drive train of the internal combustion engine. Further, a separable via a clutch drive connection between the internal combustion engine and a hydraulic pump is provided, via which a branched hydraulic circuit is supplied, in which a branch line, a gear motor is used, which serves as a drive for an air compressor and a generator and the supply of the other branch line fast level control is running, the working cylinders are connected to this branch each with the interposition of a control module. The driven by the internal combustion engine via the clutch pump is designed as a variable displacement pump and is controlled in the hydraulic system such that the level control is operated at substantially constant pressure and that, a further embodiment result, with lying in the inlet to the gear pump Proportional Flow control valve in the open position, the variable delivers a fixed volume flow. Objective for the plant is to achieve an increased charging current of the generator and maximum cooling capacity of the air conditioning compressor at idle speed of the internal combustion engine in case of priority, if necessary, supply the level control.

Ein weiteres hydraulisches Antriebssystem für Dächer von Fahrzeugen mit zu öffnendem Aufbau, bei dem zumindest ein Dachteil über einen Aktuator zu verstellen ist, ist aus der gattungsgemässen US 2003/0005692 A1 bekannt. Angestrebt wird für solche Dächer ein über dem Verstellweg des Daches ungestörter, den konstruktiven Vorgaben entsprechender Bewegungsablauf, also eine "ideale" Verstellung des Daches. Hierzu wird bei der bekannten Lösung vorgesehen, über die Pumpe den Verstellaktuator in einer jeweiligen Dachstellung mit einem Arbeitsdruck zu beaufschlagen, der als "vorgegebener" Arbeitsdruck bezogen auf einen idealen Bewegungsablauf, einer "angenommenen", zum idealen Bewegungsablauf korrespondierenden Dachlast entspricht.Another hydraulic drive system for roofs of vehicles with opening structure, in which at least one roof part is to be adjusted via an actuator, is of the generic type US 2003/0005692 A1 known. The aim is for such roofs on the adjustment of the roof undisturbed, the design specifications corresponding movement, so an "ideal" adjustment of the roof. For this purpose, it is provided in the known solution, via the pump to apply the Verstellaktuator in a respective roof position with a working pressure, which corresponds to a "predetermined" working pressure related to an ideal movement, a "assumed" corresponding to the ideal motion roof load.

Zum "vorgegebenen" Arbeitsdruck korrespondiert eine Leistung des die Pumpe antreibenden Motores und ein über den Motor fließender Strom. Abweichungen der "tatsächlichen" Dachlast von der "angenommenen" Dachlast ergeben sich bei gestörtem Bewegungsablauf und bedingen Veränderungen des über den Motor fließenden Stromes, der als Messgröße erfasst wird. Ergeben sich solche Abweichungen - z.B. eine gegenüber der angenommenen Dachlast erhöhte Dachlast beim Anfahren des Daches gegen eine Anschlaglage -, so wird der damit verbundenen Druckänderung durch Änderung der Motorleistung Rechnung getragen. Es wird im vorgenannten Fall die Motorleistung zurückgenommen, um den den Aktuator beaufschlagenden Arbeitsdruck und damit die der Dachlast entgegenwirkende Stellkraft zu verringern.To the "predetermined" working pressure corresponds to a power of the motor driving the pump and a current flowing through the motor current. Deviations of the "actual" roof load from the "assumed" roof load result in disturbed motion sequence and cause changes in the current flowing through the motor, which is detected as a measured variable. Are such deviations - e.g. a relation to the assumed roof load increased roof load when starting the roof against a stop position -, so the associated pressure change by changing the engine power is taken into account. In the aforementioned case, the engine power is reduced in order to reduce the working pressure acting on the actuator and thus the restoring force counteracting the roof load.

In Abhängigkeit von der "tatsächlichen" Dachlast wird somit die Motorleistung verändert, und dies lastabhängig.Depending on the "actual" roof load thus the engine power is changed, and this load-dependent.

Als Analogie zur Erfassung von Abweichungen des tatsächlichen Arbeitsdruckes vom bezogen auf eine Dachlast "angenommenen" Arbeitsdruck sieht die bekannte Lösung unter anderem weiter vor, die auf den Rücklauf des Hydrauliksystemes abfließende Menge des Arbeitsmediums als Messgröße zu verwenden, oder auch mit einem Durchflusssensor zu arbeiten, über den erfasst wird, ob ein Zufluss von der Pumpe auf den Aktuator stattfindet. In Abhängigkeit von diesen Werten wird die Motorleistung des die Pumpe antreibenden Motores verändert und der der Pumpleistung entsprechende Arbeitsdruck zurückgenommen.As an analogy to the detection of deviations of the actual working pressure from the "assumed" working pressure relative to a roof load, the known solution also provides, inter alia, for using the amount of the working fluid flowing off the return of the hydraulic system as a measured variable, or also for working with a flow sensor, via which it is detected whether there is an inflow from the pump to the actuator. Depending on these values, the engine power of the motor driving the pump is changed and the working pressure corresponding to the pump power is reduced.

Weiter ist aus der US 2,952,127 A ein Hydrauliksystem für Fahrzeuge bekannt, bei dem über eine gemeinsame, motorseitig angetriebene Pumpe sowohl die Servolenkung wie auch Stellzylinder als Aktuatoren für ein verstellbares Fahrzeugdach mit Druckmittel zu beaufschlagen sind. Bezüglich der Servolenkung erfolgt dies über ein Lenkventil gesteuert in Abhängigkeit von fahrerseitigen Lenkeingaben auf ein Lenkrad. Bezüglich der Aktuatoren für das Fahrzeugdach ist eine separate Ansteuerung dadurch gegeben, dass fahrerseitig über einen Handsteller eine zugehörige Schieberanordnung beaufschlagt wird.Next is from the US 2,952,127 A a hydraulic system for vehicles, in which a common, motor-side driven pump both the power steering and adjusting cylinders are to be acted as actuators for an adjustable vehicle roof with pressure medium. With respect to the power steering this is done via a steering valve controlled in response to driver-side steering inputs to a steering wheel. With respect to the actuators for the vehicle roof, a separate control is given by the fact that the driver side is acted upon by an associated slider arrangement via an actuator.

Aus der US 3,613,818 A ist ein Lenksystem für Nutzfahrzeuge mit hydraulisch beaufschlagten Stellzylindern bekannt, die über ein Lenkventil an eine Versorgungseinheit angeschlossen sind. Die Versorgungseinheit umfasst eine vom Fahrzeugmotor angetriebene Hauptpumpe sowie eine Hilfspumpe. In der Verbindung der Versorgungseinheit zu den Stellzylindern liegt das Lenkventil mit Anschluss zum Tank, und die Versorgungsleitung ist seitens der Versorgungseinheit an ein dieser zugehöriges Steuer- und Sensorventil angeschlossen. Über dieses Steuer- und Sensorventil wird durch Sensieren des von der Hauptpumpe geförderten Volumenstromes die Funktion der Hauptpumpe überwacht, und es wird bei Abfall des Volumenstromes der Hauptpumpe unter diesen Grenzwert die Hilfspumpe über das Steuer- und Sensorventil mit der Versorgungsleitung verbunden. Liegt der von der Hauptpumpe geförderte Volumenstrom oberhalb des vorgenannten Grenzwertes, so fördert die Hilfspumpe lediglich im Kreislauf über den Tank. Die Hilfspumpe wird bei einem derartigen Lenksystem somit lediglich in Abhängigkeit von der Größe des über die Hauptpumpe geförderten Volumenstromes in die Versorgung der Stellzylinder einbezogen und für deren Versorgung genutzt.From the US 3,613,818 A is a steering system for commercial vehicles with hydraulically actuated actuating cylinders known which are connected via a steering valve to a supply unit. The supply unit comprises a main pump driven by the vehicle engine and an auxiliary pump. In the connection of the supply unit to the adjusting cylinders is the steering valve with connection to the tank, and the supply line is connected by the supply unit to one of these associated control and sensor valve. By means of this control and sensor valve, by sensing the volume flow delivered by the main pump, the function of the main pump is monitored, and it becomes if the volume flow of the main pump drops below this limit, the auxiliary pump is connected to the supply line via the control and sensor valve. If the volume flow delivered by the main pump is above the aforementioned limit value, the auxiliary pump merely circulates through the tank. The auxiliary pump is thus included in such a steering system thus only in dependence on the size of the funded via the main pump flow in the supply of actuating cylinders and used for their supply.

Der Erfindung liegt die Aufgabe zugrunde, ein hydraulisches Antriebssystem der eingangs genannten Art dahingehend auszubilden, dass das Dach und/oder die Dachteile einzeln wie auch im Verhältnis zueinander in ihrem Bewegungsablauf den Vorgaben nahezu exakt, d. h. mit vernachlässigbaren Toleranzen, folgen.The invention has for its object to form a hydraulic drive system of the type mentioned in that the roof and / or the roof parts individually as well as in relation to each other in their sequence of movements the specifications almost exactly, d. H. with negligible tolerances, follow.

Erreicht wird dies gemäß der Erfindung mit den Merkmalen des Anspruches 1, demzufolge der Aktuator volumenstromgeregelt beaufschlagt ist, indem über einen Volumenstromsensor der Istwert des dem Aktuator zugeführten Volumenstromes erfasst, gegen den über dem Stellweg des Aktuators vorgegebenen Volumenstrom als Sollwert abgeglichen und der Differenzwert über einen Regler im Sinne einer Korrektur des Istwertes verarbeitet wird, der Volumenstrom also dahingehend verändert wird, dass der Istwert dem Sollwert entspricht.This is achieved according to the invention with the features of claim 1, according to which the actuator volume flow is applied by detected by a volume flow sensor, the actual value of the actuator supplied volumetric flow, adjusted against the preset over the travel of the actuator volume flow as the desired value and the difference value via a Regulator is processed in the sense of a correction of the actual value, the volume flow is thus changed so that the actual value corresponds to the desired value.

Eine solche Volumenstromregelung lässt sich in einfacher Weise und unter Rückgriff auf marktgängige Aggregate erreichen, wobei sowohl durch die mechanische Gängigkeit bedingte wie auch aus der Hydraulik, so beispielsweise durch Schwankungen im Fördervolumen der Pumpe bedingte Toleranzen im Bewegungsablauf vermieden werden können. Dies entsprechend der bei der Volumenstromregelung gegebenen Bereitstellung eines Volumenstromes, der von der jeweils abzustützenden Last, hier der Dachlast, unabhängig ist und der dem angestrebten, ungestörten Bewegungsablauf für das Dach entspricht.Such a flow control can be achieved in a simple manner and by resorting to commercially available units, which can be avoided both by the mechanical movement caused as well as from the hydraulics, such as fluctuations in the delivery volume of the pump tolerances in the movement. This is in accordance with the given in the flow control provision of a volume flow of the respective load to be supported, here the roof load, regardless is and corresponds to the desired, undisturbed movement sequence for the roof.

Im Rahmen der Erfindung kann dies dadurch geschehen, dass bei als Volumenstromquelle vorgesehener Pumpe deren Fördermenge durch Veränderung der Pumpendrehzahl und/oder durch Veränderung des Pumpvolumens an den Sollwert angepasst wird.In the context of the invention, this can be done in that when provided as a volume flow source pump whose flow rate is adjusted by changing the pump speed and / or by changing the pump volume to the target value.

Im Rahmen der Erfindung liegt es auch, den Volumenstrom über ein der Pumpe nachgeordnetes Proportionalventil entsprechend einzustellen. Die letztgenannte Lösung erweist sich insbesondere dann als zweckmäßig, wenn mehrere Dachteile vorgesehen sind und wenn jedem dieser Dachteile ein Aktuator zugeordnet ist, der, entsprechend der notwendigen Abstimmung der Bewegungsabläufe der Dachteile aufeinander, volumenstromgeregelt beaufschlagt ist. Eine solche individuelle volumenstromgeregelte Beaufschlagung mehrerer Aktuatoren lässt sich bei Verwendung einer gemeinsamen Volumenstromquelle, die insbesondere als Pumpe ausgestaltet ist, über nachgeordnete Proportionalventile erreichen. Die Verarbeitung der im Zulauf auf den jeweiligen Aktuator über einen jeweiligen Volumenstromsensor gemessenen Istwerte erfolgt zweckmäßigerweise in einem Regler, indem, bezogen auf die jeweilige Anzahl der Aktuatoren, bzw. der über diese beaufschlagten Dachteile in entsprechender Zuordnung der Volumenstrom über dem Stellweg als Sollwert z. B. in Kennlinien oder Kennfeldern abgelegt ist.In the context of the invention, it is also appropriate to adjust the volume flow via a proportional downstream of the pump proportional valve. The latter solution proves to be particularly useful if several roof parts are provided and if each of these roof parts an actuator is assigned, which, according to the necessary vote of the movements of the roof parts to each other, volume flow control is applied. Such an individual volume-flow-controlled admission of a plurality of actuators can be achieved by using a common volume flow source, which is designed in particular as a pump, via downstream proportional valves. The processing of the actual values measured in the feed to the respective actuator via a respective volumetric flow sensor is expediently carried out in a controller by, based on the respective number of actuators, or the roof parts acted upon by these actuators in a corresponding assignment of the volumetric flow over the actuating path as desired value z. B. is stored in curves or maps.

Weitere Einzelheiten und Merkmale der Erfindung ergeben sich aus den Ansprüchen. Ferner wird die Erfindung nachstehend mit weiteren Einzelheiten anhand eines Ausführungsbeispieles erläutert, das im Schema ein hydraulisches Antriebssystem für ein nicht dargestelltes Dach eines Fahrzeuges mit zu öffnendem Aufbau, sei es in Form eines Hardtops mit einem oder mehreren Dachteilen oder in Form eines Softtops, zeigt.Further details and features of the invention will become apparent from the claims. Furthermore, the invention will be explained below with further details with reference to an embodiment which shows in the diagram a hydraulic drive system for a not shown roof of a vehicle to be opened structure, be it in the form of a hardtop with one or more roof parts or in the form of a soft top.

In der Figur ist mit 1 ein Aktuator in der beispielsweisen Ausgestaltung als doppelt wirkender Stellzylinder 2 gezeigt, dessen Kolbenstange 3 in nicht gezeigter Antriebsverbindung beispielsweise zu einem Ritzel steht, das einer drehfest mit einem Antriebslenker einer Dachkinematik des Daches verbundenen Welle zugeordnet ist, so dass durch die Verstellbewegung des Aktuators 1 das über die Kinematik getragene Dach oder der über die Kinematik getragene Dachteil verstellbar ist. Eine diesbezügliche beispielsweise Lösung zeigt die DE 101 49 228 A . Der Aktuator 1 kann auch, zur Verstellung zweier oder mehrerer Dachteile gegeneinander, in der kinematischen Verbindung dieser Dachteile, bzw. als Antrieb zwischen diesen vorgesehen sein.In the figure, 1 with an actuator in the exemplary embodiment as a double-acting actuator cylinder 2 is shown, the Piston rod 3 in not shown drive connection, for example, to a pinion, which is associated with a non-rotatably connected to a drive arm of a roof kinematics of the roof shaft, so that by the adjusting movement of the actuator 1 carried on the kinematics roof or carried on the kinematics roof part is adjustable , A related example of this solution shows the DE 101 49 228 A , The actuator 1 can also, for the adjustment of two or more roof parts against each other, be provided in the kinematic connection of these roof parts, or as a drive between them.

Abweichend von der gezeigten Darstellung kann der Aktuator 1 als rotatorischer Stellantrieb ausgebildet sein.Notwithstanding the illustration shown, the actuator 1 may be formed as a rotary actuator.

Der Aktuator 1 steht, wie dargelegt, in mechanischer Zwangsverbindung zum zu verstellenden Dach bzw. Dachteil und es ist dementsprechend, bezogen auf das Ausführungsbeispiel, der jeweiligen Position des mit der Kolbenstange 3 verbundenen Daches bzw. Dachteiles eine bestimmte Position des Daches bzw. Dachteiles zugeordnet. Dementsprechend kann über die Erfassung der Lage der Kolbenstange 3 zum Stellzylinder 2 oder zu einem anderen entsprechenden Festpunkt, die entsprechende Position des Daches bzw. des Dachteiles erfasst werden.The actuator 1 is, as explained, in mechanical positive connection to be adjusted roof or roof part and it is accordingly assigned, based on the embodiment, the respective position of the connected to the piston rod 3 roof or roof part a specific position of the roof or roof part , Accordingly, the detection of the position of the piston rod 3 to the actuating cylinder 2 or to another corresponding fixed point, the corresponding position of the roof or the roof part can be detected.

Im Ausführungsbeispiel wird die zur Position des Daches bzw. des jeweiligen Dachteiles entsprechende Position des Aktuators über seinem Stellweg über ein Messsystem 4 erfasst, das, symbolisch, mit einem Widerstandsmessgerät 5 arbeitend veranschaulicht ist, das eine Spule 6 und einen mit der Kolbenstange 3 lagefest verbundenen Schleifkörper 7 umfasst. Das Messsystem 4 steht mit dem Regler 8 in Verbindung, über den die Ansteuerung der Volumenstromquelle 9 erfolgt. Die Volumenstromquelle 9 kann beispielsweise durch eine Hydropumpe 10 und ein nachgeschaltetes 3/4-Wegeventil 11 gebildet sein, das als Proportionalventil ausgebildet ist und, entsprechend seiner Ansteuerung, über die Leitungen 12 oder 13 den Stellzylinder 2 im Sinne des Aus- oder Einfahrens der Kolbenstange 3 beaufschlagt.In the exemplary embodiment, the position of the actuator corresponding to the position of the roof or of the respective roof part is detected via its travel path via a measuring system 4, which, symbolically, is illustrated working with a resistance measuring device 5 which has a coil 6 and a position fixed to the piston rod 3 Grinding 7 includes. The measuring system 4 is connected to the controller 8, via which the control of the volume flow source 9 takes place. The volumetric flow source 9 may be formed, for example, by a hydraulic pump 10 and a downstream 3/4-way valve 11 as a proportional valve is formed and, according to its control, via the lines 12 or 13, the actuating cylinder 2 in the sense of the extension or retraction of the piston rod 3 acted upon.

Im Ausführungsbeispiel mündet die Leitung 12 auf den von Kolbenstange 3 abgelegenen Arbeitsraum 14 des Stellzylinders 2 und es ist in der Leitung 12 ein Volumenstromsensor 15 bekannten Aufbaus angeordnet. Derartige Volumenstromsensoren werden beispielsweise von IPM-Hydraulik Leipzig angeboten und erfassen den Volumenstrom als eine zum Öffnungshub eines Stellzylinders direkt proportionale Größe, die im Rahmen des erfindungsgemäßen Antriebssystemes als Istwert des Volumenstromes dem Regler 8 zugeführt wird.In the exemplary embodiment, the conduit 12 opens onto the working chamber 14 of the actuating cylinder 2 remote from the piston rod 3, and a volume flow sensor 15 of known construction is arranged in the conduit 12. Such volume flow sensors are offered, for example, by IPM-Hydraulik Leipzig and detect the volume flow as a directly proportional to the opening stroke of an actuating cylinder size, which is supplied to the controller 8 as the actual value of the volume flow in the context of the drive system according to the invention.

Im Regler 8 ist der Sollwert des Volumenstromes, der bei der Bewegung des Daches für das jeweilige Dach bzw. dem jeweiligen Dachteil der gewünschten Verstellgeschwindigkeit entspricht, erfasst und wird gegen den Istwert des Volumenstromes, der über den Volumenstromsensor 15 gemessen dem Regler 8 zugeführt wird, abgeglichen. In Berücksichtigung der Ist-Sollabweichung wird die Volumenstromquelle 9 angesteuert, so dass für den Aktuator 1 eine dem vorgegebenen Sollwert entsprechende Beaufschlagung sichergestellt ist und das Dach bzw. die zueinander verstellbaren Dachteile entsprechend lagepositioniert zueinander bzw. gegenüber den abgrenzenden Karosserieteilen bewegt werden.In the controller 8, the desired value of the volume flow, which corresponds to the desired adjustment speed during the movement of the roof for the respective roof or the respective roof part, is detected and is supplied to the controller 8 against the actual value of the volume flow which is measured via the volume flow sensor 15. adjusted. In consideration of the actual nominal deviation, the volumetric flow source 9 is actuated, so that the actuator 1 is provided with a predetermined setpoint value and the roof or mutually adjustable roof parts are correspondingly positioned relative to one another or moved relative to the demarcating body parts.

Die erfindungsgemäße Lösung ermöglicht es, das Dach bzw. die Dachteile in ihrer Verstellgeschwindigkeit zur Karosserie oder gegeneinander positionsabhängig zu steuern, so beispielsweise gegen die Endpositionen langsamer und über dazwischen liegende Verstellstrecken schneller zu bewegen. Dadurch lassen sich für das Dach bzw. die Dachteile insgesamt hohe Verstellgeschwindigkeiten erreichen, die in sicherheitsrelevanten Positionen soweit verringert werden, dass die Einklemmgefahr für Fahrzeuginsassen usw. minimiert wird.The solution according to the invention makes it possible to control the roof or the roof parts in their adjustment speed to the body or against each other in a position-dependent manner, for example, to move faster and more quickly via intermediate adjustment paths against the end positions. As a result, it is possible for the roof or the roof parts to achieve altogether high adjustment speeds, which are so far in safety-relevant positions be reduced that the risk of entrapment for vehicle occupants, etc. is minimized.

Im Regler 8 kann die jeweils vorgegebene Stellgeschwindigkeit über dem jeweiligen Verstellweg, wie angedeutet, als Kennlinie oder in Kennfeldern, abgelegt werden, so dass sowohl für ein Gesamtdach wie auch für die Dachteile eines segmentierten Daches bei entsprechenden separaten Antrieben eine gewünschte positionsgenaue Ansteuerung möglich ist.In the controller 8, the respective predetermined positioning speed over the respective adjustment, as indicated, as a characteristic or in maps, are stored so that both a total roof as well as for the roof parts of a segmented roof with appropriate separate drives a desired positionally accurate control is possible.

Die lediglich schematisch angedeutete Volumenstromquelle ermöglicht in Verbindung mit einem Aufbau aus Pumpe 10 und Proportionalventil 11 in einfacher Weise die erforderliche Einspeisung des jeweils gewünschten und erforderlichen Volumenstromes. Grundsätzlich liegt es auch im Rahmen der Erfindung, den Volumenstrom in der gewünschten Weise durch eine Drehzahlregelung der Pumpe 10 zu erreichen, so dass auf die Ausbildung des nachgeordneten Ventiles als Proportionalventil 11 gegebenenfalls verzichtet werden kann.The only schematically indicated volumetric flow source in conjunction with a construction of pump 10 and proportional valve 11 in a simple manner allows the required supply of the respective desired and required volume flow. Basically, it is also within the scope of the invention to achieve the volume flow in the desired manner by a speed control of the pump 10, so that it may be possible to dispense with the formation of the downstream valve as a proportional valve 11.

Claims (5)

  1. Hydraulic drive system for vehicle roofs comprising a construction which may be opened, in which at least one roof part may be adjusted via an actuator (1), which is connected to a volumetric flow source (9) and the position thereof over its actuating path being correlated to the respective position of the roof part as well as being detected via a measuring system (4), the measured signals corresponding to the positions of the roof parts being converted as set values in control commands for the impingement of the actuator (1), characterized in that the actuator (1) is impinged upon by controlling the volumetric flow and in that the volumetric flow predetermined over the actuating path of the actuator (1) is detected at the inlet to the actuator (1) as an actual value via a volumetric flow sensor (15) and the volumetric flow is monitored for deviations of the actual value from the set value and the deviation is controlled in order to compensate for said deviation.
  2. Hydraulic drive system according to Claim 1, characterized in that a pump (10) is provided as a volumetric flow source (9).
  3. Hydraulic drive system according to Claim 2, characterized in that the volumetric capacity of the pump (10) may be adjusted by modifying the rotational speed of the pump.
  4. Hydraulic drive system according to Claim 2, characterized in that the volumetric capacity of the pump (10) may be adjusted by modifying its pump volume.
  5. Hydraulic drive system according to Claim 2, characterized in that the volumetric flow may be adjusted via a proportional valve (11) arranged downstream of the pump.
EP04763717A 2003-08-19 2004-08-02 Hydraulic drive system used for the covers of vehicle openings Expired - Lifetime EP1656274B1 (en)

Applications Claiming Priority (2)

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DE10338551A DE10338551B3 (en) 2003-08-19 2003-08-19 Hydraulic drive system for roofs of vehicles
PCT/EP2004/008649 WO2005018972A1 (en) 2003-08-19 2004-08-02 Hydraulic drive system used for the covers of vehicle openings

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EP1656274A1 EP1656274A1 (en) 2006-05-17
EP1656274B1 true EP1656274B1 (en) 2007-11-21

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EP (1) EP1656274B1 (en)
DE (2) DE10338551B3 (en)
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US7185939B2 (en) 2007-03-06
DE502004005573D1 (en) 2008-01-03
WO2005018972A1 (en) 2005-03-03
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EP1656274A1 (en) 2006-05-17
US20060202504A1 (en) 2006-09-14

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