EP3137349A1 - Device for force simulation at an actuation element of a vehicle, preferably a pedal simulator, and apparatus for actuating an electrical clutch system - Google Patents

Device for force simulation at an actuation element of a vehicle, preferably a pedal simulator, and apparatus for actuating an electrical clutch system

Info

Publication number
EP3137349A1
EP3137349A1 EP15722033.6A EP15722033A EP3137349A1 EP 3137349 A1 EP3137349 A1 EP 3137349A1 EP 15722033 A EP15722033 A EP 15722033A EP 3137349 A1 EP3137349 A1 EP 3137349A1
Authority
EP
European Patent Office
Prior art keywords
piston
cylinder
actuating element
force
clutch
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.)
Ceased
Application number
EP15722033.6A
Other languages
German (de)
French (fr)
Inventor
Francesco Emanuele FIORINI
Sebastian Honselmann
Manuel BAßLER
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP3137349A1 publication Critical patent/EP3137349A1/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T7/00—Brake-action initiating means
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/321—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration deceleration
    • B60T8/3255—Systems in which the braking action is dependent on brake pedal data
    • B60T8/326—Hydraulic systems

Definitions

  • Device for force simulation on an actuating element of a vehicle preferably a pedal simulator, and device for actuating an electric
  • the invention relates to a device for force simulation on an actuating element of a vehicle, preferably a pedal simulator, which conveys a haptic feedback via a predetermined force-displacement behavior, comprising a piston-cylinder unit, wherein the piston is connected via a piston rod with the actuating element which axially moves the piston within the cylinder and means for actuating an electrical coupling system.
  • a pedal force simulator for a vehicle brake system with electronic signal transmission is known in which a, dependent on the foot force of the driver control of the braking torque, in particular by means of electro-hydraulic or electro-mechanical systems is performed, wherein the pedal force simulator generates a familiar for a driver's brake feel.
  • the pedal force simulator comprises a pneumatically operated piston-cylinder unit whose piston delimits a compression chamber with a controllable valve and counteracts the compression direction by means of at least one first spring element, the piston with a force and is operatively connected via a piston rod with a vehicle brake pedal such that the piston rod during the operation of the vehicle brake pedal undergoes a change in angle relative to the piston-cylinder unit.
  • This angular mobility makes high demands on the construction of the pedal force simulator.
  • DE 10 2010 061 439 A1 discloses a brake system for a motor vehicle, in which a brake pedal, which can be actuated by a driver, is connected to a pedal simulator for generating a path-dependent counteracting or restoring force.
  • the position of the brake pedal is detected by means of a sensor and its sensor signal is supplied to the control unit for evaluation.
  • the control unit In accordance with the position of the brake pedal, the control unit generates control signals for a drive control unit and a brake control device, so that a regenerated braking component generated thereby generates, together with the friction brake portion, a braking torque or a braking action which corresponds to the position of the brake pedal.
  • the pedal simulator is actuated by the control unit in such a way that an opposing force or restoring force acts on the brake pedal, ie, a travel force Depends dependency, which gives the driver a pedal feel as in a braking exclusively with a hydraulic brake system.
  • the invention has for its object to provide a device for power simulation on an actuator of a vehicle, which conveys the driver the same feeling as in a normal hydraulic system and still easy to manufacture.
  • the object is achieved in that the cylinder is filled with a medium, wherein the piston has at least one through opening and / or at least one groove extends on an inner wall of the cylinder, through which the medium upon actuation of the actuating element from a, in Movement direction of the piston in front of the piston lying first working space in a, the piston downstream second working chamber flows.
  • the device for force simulation simulates a force-displacement curve, wherein the force acting on the foot or on the hand of the vehicle user via the actuating element is caused in dependence on the path, which covers the, a resistance element forming piston.
  • the size of the device for force simulation corresponds to the size of a master cylinder in a hydraulic clutch actuation system, so that no further requirements are placed on the space requirement in the motor vehicle, which is why the power simulator can be installed instead of the master cylinder at the same point in the vehicle.
  • two continuous, axially extending openings are formed in the piston, which are arranged symmetrically about a piston axis. This ensures that the force transmitted to the piston by the medium acts uniformly on the piston, allowing a stable, approximately vertical guidance of the piston within the cylinder.
  • a diameter of the opening is formed constant.
  • the diameter of the opening determines the volume of the medium, which is separated by the piston. can pass through from the first working space in the second working space.
  • the volume and thus the force felt on the actuator is adjusted by the number of openings in the piston.
  • the at least one groove extends on the inner wall of the cylinder in a longitudinal direction of the cylinder, through which the medium flows past the piston from the first into the second working space.
  • This at least one groove alone or together with the opening in the piston allows a sensitive adjustment of the force difference, which is perceived by the vehicle user on the actuator.
  • the variation possibilities of the force differences are increased by distributing a plurality of grooves to a circumference of the inner wall of the cylinder at a uniform interval.
  • the grooves have a different length and / or a different axial position, whereby the desired difference in force over the, covered by the actuator path can be set very differentiated.
  • a larger force occurs when only a small amount of liquid passes through the grooves on the piston from the first to the second working space, whereas a small force is set when, due to the position of the piston, which depends on the position of the actuating element, a plurality be released from grooves on the inner wall of the cylinder, which releases a large surface for the exchange of the volume between the first and the second working space.
  • a shape of the grooves additionally varies in terms of cross section and / or width and / or height.
  • the medium is formed as an incompressible liquid.
  • the incompressible medium is a hydraulic fluid which is forced through the piston from the first working space into the second working space. Due to the incompressible property of the liquid creates a counterforce, which can be felt by the vehicle user on the actuating element, preferably an accelerator pedal safely.
  • a development of the invention relates to a device for actuating an electric coupling system, in which an actuating element is connected to a device for force simulation on the actuating element, wherein the position of the actuating element is detected by a sensor unit and electrically transmitted to a control unit, which with a clutch in an active compound is.
  • the device for force simulation is designed according to at least one feature embodied in this patent application. This has the advantage that in an electrical coupling system on the actuating element of the vehicle user is perceived exactly the same force as in a hydraulic or pneumatic coupling system.
  • control unit has a power unit configured as an actuator for controlling the clutch, which is mechanically or hydraulically or pneumatically coupled to the clutch.
  • the device for force simulation can be used on an actuating element of a vehicle in any form of the actuating elements.
  • FIG. 1 shows a basic illustration of an electro-hydraulic clutch actuation system
  • Figure 2 an embodiment of a pedal simulator of the electro-hydraulic
  • the electric Hydraulic Kupplungsbetatigungssystem 1 includes a pedal simulator 2, which is mechanically connected to a clutch pedal 3.
  • the clutch pedal 3 actuates via a piston rod 4 a, in the pedal simulator 2 axially movably mounted piston 5.
  • the movement of the piston 5 is detected by a displacement sensor unit 6, which is connected to the pedal simulator 2 and preferably integrated in this.
  • Via an electrical line 7, the distance sensor unit 6 is connected to a control and power unit 8.
  • the control and power unit 8 comprises an actuator, which controls the clutch 10 via a further line 9.
  • the line 9 is formed in the present case as a hydraulic line.
  • the arrangement of the coupling 10 may alternatively but also be pneumatic or mechanical.
  • FIG. 2 shows an embodiment of the pedal simulator 2 as used in the clutch actuation system 1 according to FIG.
  • the clutch pedal 3 is fastened to the piston rod 4 via a connection 11.
  • the piston 5 is moved axially via the piston rod 4 as a function of the position of the clutch pedal 3.
  • the cylinder 12 has at one end a guide element 13, for example a seal or a wall opening, in which the piston rod 4 is mounted axially.
  • the piston 5 is connected thereto and guided circumferentially on an inner wall 14 of the cylinder 12.
  • On the circumference of the inner wall 14 of the cylinder 12 extend along the longitudinal direction of the cylinder 12 grooves 15, 16, which are distributed axially with different lengths. Both the cross section and the height and width of the grooves are different. Due to this different geometry, the cylinder interior has different flow cross sections.
  • the piston 5 has symmetrically to the piston rod 4 each have an opening 17, 18, which are formed continuously and are aligned axially to a piston axis, not shown. In the direction of movement of the piston 5, a first working chamber 19 and the piston 5 is arranged downstream of a second working space 20 is formed. To the piston rod 4 and the cylinder 12, a return spring 21 is partially arranged.
  • the described pedal simulator 2 works as follows: When the clutch pedal 3 is actuated, the pedal movement is converted via the connection 11 into a corresponding advancing movement of the piston rod 4.
  • the return spring 21 is compressed and tensioned, whereby a restoring reaction force is formed. Except- the attached to the piston rod 4 piston 5 is moved relative to the stationary mounted cylinder 12 within this forward. As a result, a more or less large volume of the hydraulic fluid is displaced from the first working space 19 into the second working space 20 through the openings 17, 18 of the piston 5 forming a resistance element.
  • the hydraulic fluid additionally flows through the at least one groove 15, 16 past the piston 5 from the first working space 19
  • the desired damping behavior is determined by the geometric shape of the grooves 15, 16, such as cross-section, width and height, which are uniformly distributed on the inner circumference of the cylinder 12 ,
  • the described pedal simulator 2 is intended for a non-hydraulic actuation system, in particular a purely electric vehicle clutch system. Alternatively, however, it can also be used for any other actuation systems, such as brake systems, for example, which may also have any other actuation element instead of a pedal.

Abstract

The invention relates to a device for force simulation at an actuation element of a vehicle, preferably a pedal simulator, which gives haptic feedback by means of specified force/displacement behavior, comprising a piston/cylinder unit (5, 12), wherein the piston (5) is connected to the actuation element (3) by means of a piston rod (4), which actuation element axially moves the piston within the cylinder. In the case of a device for which the vehicle driver haptically feels the same force as in the case of a hydraulic actuation system, the cylinder is filled with a medium, wherein the piston has at least one through-opening (17, 18) and/or at least one groove (15, 16) that extends on an inner wall of the cylinder, through which at least one through-opening and/or at least one groove the medium flows from a first working chamber (19), which lies in front of the piston in a direction of motion of the piston, into a second working chamber (20), which is arranged behind the piston, when the actuation element is actuated.

Description

Vorrichtung zur Kraftsimulation an einem Betätigungselement eines Fahrzeuges, vorzugsweise ein Pedalsimulator, und Einrichtung zur Betätigung eines elektrischen  Device for force simulation on an actuating element of a vehicle, preferably a pedal simulator, and device for actuating an electric
Kupplungssvstems  Kupplungssvstems
Die Erfindung betrifft eine Vorrichtung zur Kraftsimulation an einem Betätigungselement eines Fahrzeuges, vorzugsweise ein Pedalsimulator, welcher eine haptische Rückmeldung über ein vorgegebenes Kraft-Weg-Verhalten vermittelt, umfassend eine Kolben-Zylinder-Einheit, wobei der Kolben über eine Kolbenstange mit dem Betätigungselement verbunden ist, welches den Kolben innerhalb des Zylinders axial bewegt sowie eine Einrichtung zur Betätigung eines elektrischen Kupplungssystems. The invention relates to a device for force simulation on an actuating element of a vehicle, preferably a pedal simulator, which conveys a haptic feedback via a predetermined force-displacement behavior, comprising a piston-cylinder unit, wherein the piston is connected via a piston rod with the actuating element which axially moves the piston within the cylinder and means for actuating an electrical coupling system.
Aus der DE 10 201 1 016 239 A1 ist ein Pedalkraftsimulator für eine Fahrzeugbremsanlage mit elektronischer Signalübertragung bekannt, bei der eine, von der Fußkraft des Fahrzeugführers abhängige Aussteuerung des Bremsmomentes, insbesondere mittels elektro-hydraulischer oder elektro-mechanischer Systeme vorgenommen wird, wobei der Pedalkraftsimulator ein für einen Fahrzeugführer gewohntes Bremsgefühl generiert. Der Pedalkraftsimulator umfasst eine pneumatisch arbeitende Kolben-Zylinder-Einheit, deren Kolben eine Kompressionskammer mit einem ansteuerbaren Ventil begrenzt und entgegen der Kompressionsrichtung mittels zumindest eines ersten Federelementes den Kolben mit einer Kraft belastet sowie über eine Kolbenstange mit einem Fahrzeugbremspedal derart wirkverbunden ist, dass die Kolbenstange während der Betätigung des Fahrzeugbremspedals eine Winkeländerung relativ zur Kolben-Zylinder-Einheit erfährt. Diese Winkelbeweglichkeit stellt hohe Anforderungen an die Konstruktion des Pedalkraftsimulators. From DE 10 201 1 016 239 A1 a pedal force simulator for a vehicle brake system with electronic signal transmission is known in which a, dependent on the foot force of the driver control of the braking torque, in particular by means of electro-hydraulic or electro-mechanical systems is performed, wherein the pedal force simulator generates a familiar for a driver's brake feel. The pedal force simulator comprises a pneumatically operated piston-cylinder unit whose piston delimits a compression chamber with a controllable valve and counteracts the compression direction by means of at least one first spring element, the piston with a force and is operatively connected via a piston rod with a vehicle brake pedal such that the piston rod during the operation of the vehicle brake pedal undergoes a change in angle relative to the piston-cylinder unit. This angular mobility makes high demands on the construction of the pedal force simulator.
Die DE 10 2010 061 439 A1 offenbart ein Bremssystem für ein Kraftfahrzeug, bei welchem ein Bremspedal, das von einem Fahrzeugführer betätigbar ist, mit einem Pedalsimulator zur Erzeugung einer wegabhängigen Gegen- bzw. Rückstellkraft verbunden ist. Die Stellung des Bremspedals wird mittels eines Sensors erfasst und dessen Sensorsignal dem Steuergerät zur Auswertung zugeführt. Entsprechend der Stellung des Bremspedals erzeugt das Steuergerät Steuersignale für eine Antriebssteuereinheit und eine Bremssteuereinrichtung, so dass ein dadurch erzeugter generatorischer Bremsanteil zusammen mit dem Reibungsbremsanteil ein Bremsmoment bzw. eine Bremswirkung erzeugt, die der Stellung des Bremspedals entspricht. Gleichzeitig wird der Pedalsimulator von dem Steuergerät derart angesteuert, dass auf das Bremspedal eine Gegenkraft bzw. Rückstellkraft wirkt, sich also eine Weg-Kraft- Abhängigkeit einstellt, die dem Fahrer ein Pedalgefühl wie bei einer Bremsung ausschließlich mit einer hydraulischen Bremsanlage gibt. DE 10 2010 061 439 A1 discloses a brake system for a motor vehicle, in which a brake pedal, which can be actuated by a driver, is connected to a pedal simulator for generating a path-dependent counteracting or restoring force. The position of the brake pedal is detected by means of a sensor and its sensor signal is supplied to the control unit for evaluation. In accordance with the position of the brake pedal, the control unit generates control signals for a drive control unit and a brake control device, so that a regenerated braking component generated thereby generates, together with the friction brake portion, a braking torque or a braking action which corresponds to the position of the brake pedal. At the same time, the pedal simulator is actuated by the control unit in such a way that an opposing force or restoring force acts on the brake pedal, ie, a travel force Depends dependency, which gives the driver a pedal feel as in a braking exclusively with a hydraulic brake system.
Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zur Kraftsimulation an einem Betätigungselement eines Fahrzeuges anzugeben, welche dem Fahrzeugführer das gleiche Gefühl übermittelt wie bei einer normalen hydraulischen Anlage und trotzdem einfach herstellbar ist. The invention has for its object to provide a device for power simulation on an actuator of a vehicle, which conveys the driver the same feeling as in a normal hydraulic system and still easy to manufacture.
Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass der Zylinder mit einem Medium gefüllt ist, wobei der Kolben mindestens eine durchgängige Öffnung aufweist und/oder mindestens eine Nut an einer Innenwand des Zylinders verläuft, durch welche das Medium bei einer Betätigung des Betätigungselementes aus einem, in Bewegungsrichtung des Kolbens vor dem Kolben liegenden ersten Arbeitsraum in einen, dem Kolben nachgeordneten zweiten Arbeitsraum strömt. Dies hat den Vorteil, dass auch bei einem nicht hydraulischen Betätigungssystem, insbesondere einem rein elektrischen Fahrzeugkupplungssystem, dem Fahrzeugnutzer das gleiche Gefühl übermittelt wird, wie bei einem normalen hydraulischen Betätigungssystem. Die Vorrichtung zur Kraftsimulation simuliert dabei eine Kraft-Weg-Kennlinie, wobei die Kraft, welche am Fuß oder an der Hand des Fahrzeugnutzers über das Betätigungselement angreift, in Abhängigkeit des Weges hervorgerufen wird, welchen der, ein Widerstandselement bildende Kolben zurücklegt. Die Größe der Vorrichtung zur Kraftsimulation entspricht dabei der Größe eines Geberzylinders bei einem hydraulischen Kupplungsbetätigungssystem, so dass keine weiteren Anforderungen an den Platzbedarf im Kraftfahrzeug gestellt werden, weshalb der Kraftsimulator anstelle des Geberzylinders an derselben Stelle im Kraftfahrzeug eingebaut werden kann. According to the invention the object is achieved in that the cylinder is filled with a medium, wherein the piston has at least one through opening and / or at least one groove extends on an inner wall of the cylinder, through which the medium upon actuation of the actuating element from a, in Movement direction of the piston in front of the piston lying first working space in a, the piston downstream second working chamber flows. This has the advantage that even with a non-hydraulic actuation system, in particular a purely electric vehicle coupling system, the vehicle user is given the same feeling as in a normal hydraulic actuation system. The device for force simulation simulates a force-displacement curve, wherein the force acting on the foot or on the hand of the vehicle user via the actuating element is caused in dependence on the path, which covers the, a resistance element forming piston. The size of the device for force simulation corresponds to the size of a master cylinder in a hydraulic clutch actuation system, so that no further requirements are placed on the space requirement in the motor vehicle, which is why the power simulator can be installed instead of the master cylinder at the same point in the vehicle.
Vorteilhafterweise sind in dem Kolben zwei durchgängige, axial verlaufende Öffnungen ausgebildet, welche um eine Kolbenachse symmetrisch angeordnet sind. Dadurch wird gewährleistet, dass die durch das Medium auf den Kolben übertragene Kraft gleichmäßig am Kolben angreift, wodurch eine stabile, annähernd senkrechte Führung des Kolbens innerhalb des Zylinders möglich ist. Advantageously, two continuous, axially extending openings are formed in the piston, which are arranged symmetrically about a piston axis. This ensures that the force transmitted to the piston by the medium acts uniformly on the piston, allowing a stable, approximately vertical guidance of the piston within the cylinder.
In einer Ausgestaltung ist ein Durchmesser der Öffnung konstant ausgebildet. Der Durchmesser der Öffnung bestimmt dabei das Volumen des Mediums, welches durch den Kolben hin- durch von dem ersten Arbeitsraum in den zweiten Arbeitsraum treten kann. Zusätzlich wird das Volumen und somit die am Betätigungselement spürbare Kraft durch die Anzahl der Öffnungen im Kolben eingestellt. In one embodiment, a diameter of the opening is formed constant. The diameter of the opening determines the volume of the medium, which is separated by the piston. can pass through from the first working space in the second working space. In addition, the volume and thus the force felt on the actuator is adjusted by the number of openings in the piston.
In einer Variante erstreckt sich die mindestens eine Nut an der Innenwand des Zylinders in eine Längsrichtung des Zylinders, durch welche das Medium am Kolben vorbei von dem ersten in den zweiten Arbeitsraum strömt. Diese mindestens eine Nut erlaubt allein oder gemeinsam mit der Öffnung im Kolben eine feinfühlige Abstimmung des Kraftunterschiedes, welcher von dem Fahrzeugnutzer am Betätigungselement wahrgenommen wird. In a variant, the at least one groove extends on the inner wall of the cylinder in a longitudinal direction of the cylinder, through which the medium flows past the piston from the first into the second working space. This at least one groove alone or together with the opening in the piston allows a sensitive adjustment of the force difference, which is perceived by the vehicle user on the actuator.
Die Variationsmöglichkeiten der Kraftunterschiede werden erhöht, indem mehrere Nuten an einen Umfang der Innenwand des Zylinders mit einem gleichmäßigen Abstand verteilt sind. The variation possibilities of the force differences are increased by distributing a plurality of grooves to a circumference of the inner wall of the cylinder at a uniform interval.
In einer weiteren Ausführungsform weisen die Nuten eine unterschiedliche Länge und/oder eine unterschiedliche axiale Position auf, wodurch der gewünschte Kraftunterschied über den, von dem Betätigungselement zurückgelegten Weg sehr differenziert eingestellt werden kann. Dabei tritt eine größere Kraft auf, wenn nur wenig Flüssigkeit durch die Nuten an dem Kolben vorbei vom ersten in den zweiten Arbeitsraum gelangt, wohingegen eine kleine Kraft eingestellt wird, wenn aufgrund der Position des Kolbens, welcher von der Stellung des Betätigungselementes abhängt, eine Vielzahl von Nuten an der Innenwand des Zylinders freigegeben werden, was eine große Oberfläche zum Austausch des Volumens zwischen dem ersten und dem zweiten Arbeitsraum freigibt. In a further embodiment, the grooves have a different length and / or a different axial position, whereby the desired difference in force over the, covered by the actuator path can be set very differentiated. In this case, a larger force occurs when only a small amount of liquid passes through the grooves on the piston from the first to the second working space, whereas a small force is set when, due to the position of the piston, which depends on the position of the actuating element, a plurality be released from grooves on the inner wall of the cylinder, which releases a large surface for the exchange of the volume between the first and the second working space.
Zur Bildung von unterschiedlichen Durchflussquerschnitten variiert eine Form der Nuten zusätzlich hinsichtlich Querschnitt und/oder Breite und/oder Höhe. To form different flow cross sections, a shape of the grooves additionally varies in terms of cross section and / or width and / or height.
In einer weiteren Ausführungsform ist das Medium als eine inkompressible Flüssigkeit ausgebildet. Vorteilhafterweise ist das inkompressible Medium eine Hydraulikflüssigkeit, die durch den Kolben aus dem ersten Arbeitsraum in den zweiten Arbeitsraum hindurchgedrückt wird. Aufgrund der inkompressiblen Eigenschaft der Flüssigkeit entsteht eine Gegenkraft, welche durch den Fahrzeugnutzer am Betätigungselement, vorzugsweise einem Fahrpedal, sicher fühlbar ist. Eine Weiterbildung der Erfindung betrifft eine Einrichtung zur Betätigung eines elektrischen Kupplungssystems, bei welchem ein Betätigungselement mit einer Vorrichtung zur Kraftsimulation an dem Betätigungselement verbunden ist, wobei die Stellung des Betätigungselementes von einer Sensoreinheit erfasst und elektrisch an eine Steuereinheit weitergegeben wird, welche mit einer Kupplung in einer Wirkverbindung steht. Die Vorrichtung zur Kraftsimulation ist dabei nach mindestens einem, in dieser Schutzrechtsanmeldung ausgeführten Merkmal ausgebildet. Dies hat den Vorteil, dass bei einem elektrischen Kupplungssystem an dem Betätigungselement von dem Fahrzeugnutzer genau dieselbe Kraft wahrgenommen wird, wie bei einem hydraulischen oder pneumatischen Kupplungssystem. In a further embodiment, the medium is formed as an incompressible liquid. Advantageously, the incompressible medium is a hydraulic fluid which is forced through the piston from the first working space into the second working space. Due to the incompressible property of the liquid creates a counterforce, which can be felt by the vehicle user on the actuating element, preferably an accelerator pedal safely. A development of the invention relates to a device for actuating an electric coupling system, in which an actuating element is connected to a device for force simulation on the actuating element, wherein the position of the actuating element is detected by a sensor unit and electrically transmitted to a control unit, which with a clutch in an active compound is. The device for force simulation is designed according to at least one feature embodied in this patent application. This has the advantage that in an electrical coupling system on the actuating element of the vehicle user is perceived exactly the same force as in a hydraulic or pneumatic coupling system.
Vorteilhafterweise weist die Steuereinheit eine als Aktor ausgebildete Leistungseinheit zur An- steuerung der Kupplung auf, welche mit der Kupplung mechanisch oder hydraulisch oder pneumatisch gekoppelt ist. Somit ist die Vorrichtung zur Kraftsimulation an einem Betätigungselement eines Fahrzeuges in einer beliebigen Form der Betätigungselemente einsetzbar. Advantageously, the control unit has a power unit configured as an actuator for controlling the clutch, which is mechanically or hydraulically or pneumatically coupled to the clutch. Thus, the device for force simulation can be used on an actuating element of a vehicle in any form of the actuating elements.
Die Erfindung lässt zahlreiche Ausführungsformen zu. Eine davon soll anhand der in der Zeichnung dargestellten Figuren näher erläutert werden. The invention allows numerous embodiments. One of them will be explained in more detail with reference to the figures shown in the drawing.
Es zeigen Show it
Figur 1 : eine Prinzipdarstellung eines elektro-hydraulischen Kupplungsbetätigungssys- tems, FIG. 1 shows a basic illustration of an electro-hydraulic clutch actuation system,
Figur 2: ein Ausführungsbeispiel für einen Pedalsimulator des elektro-hydraulischen  Figure 2: an embodiment of a pedal simulator of the electro-hydraulic
Kupplungsbetätigungssystems gemäß Figur 1 .  Clutch actuating system according to FIG. 1.
Gleiche Merkmale sind mit gleichen Bezugszeichen gekennzeichnet. Identical features are identified by the same reference numerals.
In Figur 1 ist eine Prinzipdarstellung eines elektro-hydraulischen Kupplungsbetätigungssystems dargestellt, welches auch als clutch-by-wire-System bezeichnet wird. Das elektro- hydraulische Kupplungsbetatigungssystem 1 umfasst einen Pedalsimulator 2, der mechanisch mit einem Kupplungspedal 3 verbunden ist. Das Kupplungspedal 3 betätigt über eine Kolbenstange 4 einen, in dem Pedalsimulator 2 axial beweglich gelagerten Kolben 5. Die Bewegung des Kolbens 5 wird durch eine Wegsensoreinheit 6 detektiert, die mit dem Pedalsimulator 2 verbunden und vorzugsweise in diesen integriert ist. Über eine elektrische Leitung 7 ist die Wegsensoreinheit 6 mit einer Steuer- und Leistungseinheit 8 verbunden. Neben der Steuerelektronik umfasst die Steuer- und Leistungseinheit 8 einen Aktor, welcher über eine weitere Leitung 9 die Kupplung 10 ansteuert. Die Leitung 9 ist im vorliegenden Fall als hydraulische Leitung ausgebildet. Die Anordnung der Kupplung 10 kann alternativ aber auch pneumatisch oder mechanisch erfolgen. 1 shows a schematic diagram of an electro-hydraulic clutch actuation system, which is also referred to as a clutch-by-wire system. The electric Hydraulic Kupplungsbetatigungssystem 1 includes a pedal simulator 2, which is mechanically connected to a clutch pedal 3. The clutch pedal 3 actuates via a piston rod 4 a, in the pedal simulator 2 axially movably mounted piston 5. The movement of the piston 5 is detected by a displacement sensor unit 6, which is connected to the pedal simulator 2 and preferably integrated in this. Via an electrical line 7, the distance sensor unit 6 is connected to a control and power unit 8. In addition to the control electronics, the control and power unit 8 comprises an actuator, which controls the clutch 10 via a further line 9. The line 9 is formed in the present case as a hydraulic line. The arrangement of the coupling 10 may alternatively but also be pneumatic or mechanical.
In Figur 2 ist ein Ausführungsbeispiel des Pedalsimulators 2 gezeigt, wie dieser in dem Kupplungsbetatigungssystem 1 gemäß Figur 1 verwendet wird. Das Kupplungspedal 3 ist über einen Anschluss 1 1 an der Kolbenstange 4 befestigt. Innerhalb eines Zylinders 12 wird der Kolben 5 über die Kolbenstange 4 in Abhängigkeit von der Stellung des Kupplungspedals 3 axial bewegt. Der Zylinder 12 weist an einem Ende ein Führungselement 13, beispielsweise eine Dichtung oder eine Wandöffnung, auf, in welcher die Kolbenstange 4 axial gelagert ist. Am Vorderende der Kolbenstange 4 ist der Kolben 5 mit dieser verbunden und an einer Innenwand 14 des Zylinders 12 umfangsseitig geführt. Am Umfang der Innenwand 14 des Zylinders 12 erstrecken sich entlang der Längsausrichtung des Zylinders 12 Nuten 15, 16, die sich axial mit unterschiedlicher Länge verteilen. Dabei sind sowohl der Querschnitt als auch Höhe und Breite der Nuten unterschiedlich. Durch diese unterschiedliche Geometrie weist das Zylinderinnere unterschiedliche Durchflussquerschnitte auf. FIG. 2 shows an embodiment of the pedal simulator 2 as used in the clutch actuation system 1 according to FIG. The clutch pedal 3 is fastened to the piston rod 4 via a connection 11. Within a cylinder 12, the piston 5 is moved axially via the piston rod 4 as a function of the position of the clutch pedal 3. The cylinder 12 has at one end a guide element 13, for example a seal or a wall opening, in which the piston rod 4 is mounted axially. At the front end of the piston rod 4, the piston 5 is connected thereto and guided circumferentially on an inner wall 14 of the cylinder 12. On the circumference of the inner wall 14 of the cylinder 12 extend along the longitudinal direction of the cylinder 12 grooves 15, 16, which are distributed axially with different lengths. Both the cross section and the height and width of the grooves are different. Due to this different geometry, the cylinder interior has different flow cross sections.
Der Kolben 5 weist symmetrisch zur Kolbenstange 4 jeweils eine Öffnung 17, 18 auf, die durchgängig ausgebildet sind und axial zu einer nicht weiter dargestellten Kolbenachse ausgerichtet sind. In Bewegungsrichtung des Kolbens 5 ist ein erster Arbeitsraum 19 und dem Kolben 5 nachgeordnet ist ein zweiter Arbeitsraum 20 ausgebildet. Um die Kolbenstange 4 und den Zylinder 12 ist teilweise eine Rückstellfeder 21 angeordnet. The piston 5 has symmetrically to the piston rod 4 each have an opening 17, 18, which are formed continuously and are aligned axially to a piston axis, not shown. In the direction of movement of the piston 5, a first working chamber 19 and the piston 5 is arranged downstream of a second working space 20 is formed. To the piston rod 4 and the cylinder 12, a return spring 21 is partially arranged.
Der beschriebene Pedalsimulator 2 funktioniert wie folgt: Bei der Betätigung des Kupplungspedals 3 wird die Pedalbewegung über den Anschluss 1 1 in eine entsprechende Vorschubbewegung der Kolbenstange 4 umgesetzt. Hierbei wird zum einen die Rückstellfeder 21 zusammengedrückt und gespannt, wodurch eine rückstellende Reaktionskraft entsteht. Außer- dem wird der an der Kolbenstange 4 befestigte Kolben 5 gegenüber dem ortsfest gelagerten Zylinder 12 innerhalb diesem vorwärts bewegt. Dadurch wird ein mehr oder weniger großes Volumen der hydraulischen Flüssigkeit durch die Öffnungen 17, 18 des, ein Widerstandselement bildenden Kolben 5 hindurch von dem ersten Arbeitsraum 19 in den zweiten Arbeitsraum 20 verdrängt. Nimmt der Kolben 5 im Zylinder 12 eine Position ein, an welcher mindestens eine Nut 15, 16 an der Innenwand des Zylinders 12 ausgebildet ist, so fließt die hydraulische Flüssigkeit zusätzlich durch die mindestens eine Nut 15, 16 an Kolben 5 vorbei vom ersten Arbeitsraum 19 in den zweiten Arbeitsraum 20. Das gewünschte Dämpfungsverhalten, welches am Kupplungspedal 3 durch den Fahrzeugnutzer spürbar ist, wird dabei durch die geometrische Form der Nuten 15, 16, wie Querschnitt, Breite und Höhe, vorgegeben, welche gleichmäßig am Innenumfang des Zylinders 12 verteilt sind. The described pedal simulator 2 works as follows: When the clutch pedal 3 is actuated, the pedal movement is converted via the connection 11 into a corresponding advancing movement of the piston rod 4. Here, on the one hand, the return spring 21 is compressed and tensioned, whereby a restoring reaction force is formed. Except- the attached to the piston rod 4 piston 5 is moved relative to the stationary mounted cylinder 12 within this forward. As a result, a more or less large volume of the hydraulic fluid is displaced from the first working space 19 into the second working space 20 through the openings 17, 18 of the piston 5 forming a resistance element. If the piston 5 in the cylinder 12 assumes a position at which at least one groove 15, 16 is formed on the inner wall of the cylinder 12, the hydraulic fluid additionally flows through the at least one groove 15, 16 past the piston 5 from the first working space 19 The desired damping behavior, which is felt by the vehicle user on the clutch pedal 3, is determined by the geometric shape of the grooves 15, 16, such as cross-section, width and height, which are uniformly distributed on the inner circumference of the cylinder 12 ,
Der beschriebene Pedalsimulator 2 ist für ein nicht hydraulisches Betätigungssystem, insbesondere ein rein elektrisches Fahrzeug-Kupplungssystem vorgesehen. Er kann alternativ aber auch für beliebige andere Betätigungssysteme, wie beispielsweise Bremssysteme, eingesetzt werden, die auch statt eines Pedals ein beliebig anderes Betätigungselement aufweisen können. The described pedal simulator 2 is intended for a non-hydraulic actuation system, in particular a purely electric vehicle clutch system. Alternatively, however, it can also be used for any other actuation systems, such as brake systems, for example, which may also have any other actuation element instead of a pedal.
Bezuqszeichenliste elektrisches Kupplungsbetätigungssystem Pedalsimulator Reference sign list Electric clutch actuation system Pedal simulator
Kupplungspedal clutch pedal
Kolbenstange piston rod
Kolben piston
Wegsensoreinheit Displacement sensor unit
Elektrische Leitung Electrical line
Steuer- und Leistungseinheit Control and power unit
Leitung management
Kupplung clutch
Anschluss connection
Zylinder cylinder
Führungselement guide element
Innenwand des Zylinders Inner wall of the cylinder
Nut groove
Nut groove
Öffnung opening
Öffnung opening
Erster Arbeitsraum First workroom
Zweiter Arbeitsraum Second workspace
Rückstellfeder Return spring

Claims

Patentansprüche Patent claims
Vorrichtung zur Kraftsimulation an einem Betätigungselement eines Fahrzeuges, vorzugsweise ein Pedalsimulator, welcher eine haptische Rückmeldung über ein vorgegebenes Kraft-Weg-Verhalten vermittelt, umfassend eine Kolben-Zylinder-Einheit (5, 12), wobei der Kolben (5) über eine Kolbenstange (4) mit dem Betätigungselement (3) verbunden ist, welches den Kolben (5) innerhalb des Zylinders (12) axial bewegt, dadurch gekennzeichnet, dass der Zylinder (12) mit einem Medium gefüllt ist, wobei der Kolben (5) mindestens eine durchgängige Öffnung (17, 18) aufweist und/oder mindestens eine Nut (15, 16) an einer Innenwand (14) des Zylinders (12) verläuft, durch welche das Medium bei einer Betätigung des Betätigungselementes (3) aus einem, in Bewegungsrichtung des Kolbens (5) vor dem Kolben (5) liegenden ersten Arbeitsraum (19) in einen, dem Kolben (5) nachgeordneten zweiten Arbeitsraum (20) strömt. Device for force simulation on an actuating element of a vehicle, preferably a pedal simulator, which provides haptic feedback about a predetermined force-distance behavior, comprising a piston-cylinder unit (5, 12), the piston (5) being connected via a piston rod ( 4) is connected to the actuating element (3), which moves the piston (5) axially within the cylinder (12), characterized in that the cylinder (12) is filled with a medium, the piston (5) having at least one continuous Opening (17, 18) and/or at least one groove (15, 16) runs on an inner wall (14) of the cylinder (12), through which the medium passes out of one in the direction of movement of the piston when the actuating element (3) is actuated (5) the first working space (19) located in front of the piston (5) flows into a second working space (20) downstream of the piston (5).
Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass in dem Kolben (5) zwei durchgängige, axial verlaufende Öffnungen (17,18) ausgebildet sind, welche um eine Kol-benachse symmetrisch angeordnet sind. Device according to claim 1, characterized in that two continuous, axially extending openings (17, 18) are formed in the piston (5), which are arranged symmetrically about a piston axis.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass ein Durchmesser der Öffnung (17, 18) konstant ausgebildet ist. 3. Device according to claim 1 or 2, characterized in that a diameter of the opening (17, 18) is designed to be constant.
4. Vorrichtung nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass die mindestens eine Nut (15, 16) sich an der Innenwand (14) des Zylinders (12) in eine Längsrichtung des Zylinders (12) erstreckt, durch welche das Medium am Kolben (5) vorbei von dem ersten (19) in den zweiten Arbeitsraum (20) strömt. 4. Device according to claim 1, 2 or 3, characterized in that the at least one groove (15, 16) extends on the inner wall (14) of the cylinder (12) in a longitudinal direction of the cylinder (12), through which the medium flows past the piston (5) from the first (19) into the second working space (20).
5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass mehrere Nuten (15, 16) an einen Umfang der Innenwand (14) des Zylinders (12) mit einem gleichmäßigen Abstand verteilt sind. 5. Device according to claim 4, characterized in that a plurality of grooves (15, 16) are distributed on a circumference of the inner wall (14) of the cylinder (12) at a uniform distance.
6. Vorrichtung nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass die Nuten (15, 16) eine unterschiedliche Länge und/oder eine unterschiedliche axiale Position aufweisen. 6. Device according to claim 4 or 5, characterized in that the grooves (15, 16) have a different length and/or a different axial position.
7. Vorrichtung nach Anspruch 4, 5 oder 6, dadurch gekennzeichnet, dass eine Form der Nuten (15, 16) hinsichtlich Querschnitt und/oder Breite und/oder Höhe variiert. 7. Device according to claim 4, 5 or 6, characterized in that a shape of the grooves (15, 16) varies in terms of cross section and/or width and/or height.
8. Vorrichtung nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Medium als eine inkompressible Flüssigkeit ausgebildet ist. 8. Device according to at least one of the preceding claims, characterized in that the medium is designed as an incompressible liquid.
9. Einrichtung zur Betätigung eines elektrischen Kupplungssystems, bei welchem ein Betätigungselement (3) mit einer Vorrichtung (2) zur Kraftsimulation an dem Betätigungselement (3) verbunden ist, wobei die Stellung des Betätigungselementes (3) von einer Sensoreinheit (6) erfasst und elektrisch an eine Steuereinheit (8) weitergegeben wird, welche mit einer Kupplung (10) in einer Wirkverbindung steht, dadurch gekennzeichnet, dass die Vorrichtung (2) zur Kraftsimulation nach mindestens einem der vorhergehenden Ansprüche 1 bis 8 ausgebildet ist. 9. Device for actuating an electrical clutch system, in which an actuating element (3) is connected to a device (2) for force simulation on the actuating element (3), the position of the actuating element (3) being detected by a sensor unit (6) and electrically is passed on to a control unit (8), which is in an operative connection with a clutch (10), characterized in that the device (2) for force simulation is designed according to at least one of the preceding claims 1 to 8.
10. Einrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die Steuereinheit (8) eine als Aktor ausgebildete Leistungseinheit zur Ansteuerung der Kupplung aufweist, welche mit der Kupplung (10) mechanisch oder hydraulisch oder pneumatisch gekoppelt ist. 10. Device according to claim 9, characterized in that the control unit (8) has a power unit designed as an actuator for controlling the clutch, which is coupled to the clutch (10) mechanically or hydraulically or pneumatically.
EP15722033.6A 2014-04-29 2015-03-31 Device for force simulation at an actuation element of a vehicle, preferably a pedal simulator, and apparatus for actuating an electrical clutch system Ceased EP3137349A1 (en)

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DE102014207982 2014-04-29
PCT/DE2015/200215 WO2015165450A1 (en) 2014-04-29 2015-03-31 Device for force simulation at an actuation element of a vehicle, preferably a pedal simulator, and apparatus for actuating an electrical clutch system

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EP (1) EP3137349A1 (en)
JP (1) JP2017515068A (en)
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US10359802B2 (en) 2016-08-22 2019-07-23 Cts Corporation Variable force electronic vehicle clutch pedal
DE102017103209A1 (en) * 2017-02-16 2018-08-16 Schaeffler Technologies AG & Co. KG Pedal force simulation device with integrated sensor and actuation system
FR3068940B1 (en) * 2017-07-13 2019-08-23 Robert Bosch Gmbh ELECTRONIC BRAKE SYSTEM DECOUPLED WITH A RADIATION EFFECTIVE MOTION TRANSMISSION DEVICE
DE102021119439A1 (en) 2021-07-27 2023-02-02 Zf Active Safety Gmbh Pneumatic brake pedal module

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DE10016879A1 (en) * 2000-04-05 2001-10-18 Bayerische Motoren Werke Ag Actuating device for a motor vehicle brake system of the "brake by wire" type
JP5243315B2 (en) * 2009-03-16 2013-07-24 本田技研工業株式会社 Electronic clutch control device for vehicle
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