DE102005037477A1 - Piston rod`s position detecting method for motor vehicle, involves providing sensor units that provide output signal, where position per unit of time of vibration absorber is adjustable in damping force characteristics of absorber - Google Patents

Piston rod`s position detecting method for motor vehicle, involves providing sensor units that provide output signal, where position per unit of time of vibration absorber is adjustable in damping force characteristics of absorber Download PDF

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Publication number
DE102005037477A1
DE102005037477A1 DE200510037477 DE102005037477A DE102005037477A1 DE 102005037477 A1 DE102005037477 A1 DE 102005037477A1 DE 200510037477 DE200510037477 DE 200510037477 DE 102005037477 A DE102005037477 A DE 102005037477A DE 102005037477 A1 DE102005037477 A1 DE 102005037477A1
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Germany
Prior art keywords
piston rod
damping force
vibration damper
absorber
sensor means
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Application number
DE200510037477
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German (de)
Inventor
Dieter Dr.-Ing. Lutz
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ZF Friedrichshafen AG
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ZF Friedrichshafen AG
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Publication date
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Priority to DE200510037477 priority Critical patent/DE102005037477A1/en
Publication of DE102005037477A1 publication Critical patent/DE102005037477A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/019—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the type of sensor or the arrangement thereof
    • B60G17/01933—Velocity, e.g. relative velocity-displacement sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
    • B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
    • B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
    • B60G15/062—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper
    • B60G15/063—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper characterised by the mounting of the spring on the damper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
    • B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
    • B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
    • B60G15/067—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper characterised by the mounting on the vehicle body or chassis of the spring and damper unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/30—Spring/Damper and/or actuator Units
    • B60G2202/31—Spring/Damper and/or actuator Units with the spring arranged around the damper, e.g. MacPherson strut
    • B60G2202/312—The spring being a wound spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/10—Mounting of suspension elements
    • B60G2204/11—Mounting of sensors thereon
    • B60G2204/112—Mounting of sensors thereon on dampers, e.g. fluid dampers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/20—Speed
    • B60G2400/202—Piston speed; Relative velocity between vehicle body and wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/25—Stroke; Height; Displacement
    • B60G2400/252—Stroke; Height; Displacement vertical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/60—Load
    • B60G2400/61—Load distribution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2401/00—Indexing codes relating to the type of sensors based on the principle of their operation
    • B60G2401/17—Magnetic/Electromagnetic
    • B60G2401/172—Hall effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2600/00—Indexing codes relating to particular elements, systems or processes used on suspension systems or suspension control systems
    • B60G2600/04—Means for informing, instructing or displaying
    • B60G2600/044—Alarm means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The method involves providing a sensor unit for a piston rod and another sensor unit that is fixed to a cylinder. The sensor units cooperate with a computer device for determining a position of the piston rod. The sensor units provide a 0-1output signal that represents a border position of the piston rod, where a position per unit of time of a vibration absorber (5) is adjustable in damping force characteristics of the absorber. An independent claim is also included for a vibration absorber with an auxiliary spring.

Description

Die Erfindung betrifft einen Schwingungsdämpfer gemäß dem Oberbegriff von Patentanspruch 1.The The invention relates to a vibration damper according to the preamble of claim 1.

Aus der DE 100 20 764 A1 ist eine Berührungslose Abstandsermittlung an einem Fahrzeug bekannt, die beispielsweise bei einem Schwingungsdämpfer verwendbar ist. Dazu wird die Kolbenstange mit einem magnetischen Muster versehen, das von einem Sensor erfasst wird und dessen Ausgangssignal von einem Rechner in eine Absolutposition der Kolbenstange umgerechnet wird. Die Erfassung der Absolutposition hängt im wesentlichen von der Auflösung des magnetischen Musters und von der internen Signalverarbeitung ab.From the DE 100 20 764 A1 For example, contactless distance detection on a vehicle is known, which is useful in a vibration damper, for example. For this purpose, the piston rod is provided with a magnetic pattern which is detected by a sensor and whose output signal is converted by a computer into an absolute position of the piston rod. The detection of the absolute position depends essentially on the resolution of the magnetic pattern and on the internal signal processing.

Aufgabe der vorliegenden Erfindung ist es, einen Schwingungsdämpfer mit einer einfachen aber trotzdem ausreichenden Positionserfassung zu realisieren.task The present invention is to provide a vibration damper a simple but sufficient position detection too realize.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, dass die Sensormittel als Schalter mit einem 0-1-Ausgangssignal ausgeführt sind, das eine Grenzposition der Kolbenstange repräsentiert, wobei aus der Häufigkeit dieser einen Position pro Zeiteinheit der Schwingungsdämpfer in seiner Dämpfkraftcharakteristik verstellbar ist.According to the invention Task solved by that the sensor means as a switch with a 0-1 output signal accomplished are that represents a limit position of the piston rod, being from the frequency this one position per unit time of the vibration damper in its damping force characteristic is adjustable.

Positionsmesseinrichtungen werden in der Regel bei Niveauregelungen eingesetzt. Einer der Hauptvorteile bei dieser Anwendung besteht darin, dass über eine tendenziell größere Dämpfkrafteinstellung ein übermäßig häufiges Einsetzen des Anschlagpuffers verhindert und damit eine plötzliche Krafteinleitung in die Fahrzeugkarosserie vermindert wird.Position-measuring devices are usually used in level control. One of the main advantages In this application, there is a tendency for greater damping force adjustment an overly frequent insertion prevents the stop buffer and thus a sudden introduction of force in the vehicle body is reduced.

Deshalb ist vorgesehen, dass oberhalb eines definierten Häufigkeitswerts die Dämpfkraftgrundeinstellung in Richtung härtere Dämpfkraft verstellt wird.Therefore is provided that above a defined frequency value the damping force basic setting towards harder damping force is adjusted.

Zusätzlich besteht die Möglichkeit, dass ein die Kolbenstangenbewegung repräsentierendes Beschleunigungssignal zusammen mit dem Schalter als Maß für die Fahrbahnoberfläche dient.In addition exists the possibility, that is an acceleration signal representative of the piston rod movement used together with the switch as a measure of the road surface.

Im Hinblick auf eine Verschleißkontrolle des Schwingungsdämpfers wird die Anzahl der Schalterkontakte aufaddiert und ab einem Schwellwert ein Warnsignal und/oder ein Wartungshinweis bereitgestellt, das den Fahrer zur Kontrolluntersuchung des Schwingungsdämpfers auffordert. Das Warnsignal oder der Wartungshinweis können in einem Diagnosesystem gespeichert sein.in the With regard to wear control of the vibration damper the number of switch contacts is added up and off a threshold value a warning and / or a maintenance alert is provided that ask the driver to check the vibration damper. The warning or maintenance message may be in a diagnostic system be saved.

Ein Schwingungsdämpfer für das erfindungsgemäße Verfahren ist mit einer hubabhängig wirksamen Zusatzfeder ausgeführt, die eines der Sensormittel trägt.One vibration for the inventive method is with a stroke-dependent effective Additional spring executed, which carries one of the sensor means.

Gemäß einem vorteilhaften Unteranspruch wird die Zusatzfeder von einem Elastomerkörper gebildet. Diese Bauform der Zusatzfeder schützt den Sensor gegen äußere Einflüsse.According to one Advantageous sub-claim, the additional spring is formed by an elastomeric body. This design of the additional spring protects the sensor against external influences.

Dazu weist der Elastomerkörper einen Hohlraum zur Aufnahme zumindest eines der Sensormittel auf.To has the elastomeric body a cavity for receiving at least one of the sensor means.

Anhand der folgenden Figurenbeschreibung soll die Erfindung näher erläutert werden.Based The following description of the figures, the invention will be explained in more detail.

Es zeigt:It shows:

1 Prinzipschaubild eines Kraftfahrzeugfahrwerks 1 Schematic diagram of a vehicle chassis

2 Prinzipschaubild eines erfindungsgemäßen Schwingungsdämpfers 2 Schematic diagram of a vibration damper according to the invention

Die 1 zeigt ein aus dem Stand der Technik bekanntes sehr einfaches Prinzipschaubild eines schwingungsfähigen Systems in der Bauform eines Kraftfahrzeugfahrwerks 1, das an jedem Rad 3 einen Schwingungsdämpfer 5 aufweist, dessen Dämpfkraft veränderbar ist. Eine zentrale Regeleinheit 7 übernimmt die Auswertung von Sensorsignalen einer nicht dargestellten Sensorik an den Schwingungsdämpfern und von Radbeschleunigungssensoren 9. Darauf aufbauend werden Stellgrößen an Aktuatoren in oder am Schwingungsdämpfer gesendet, um die Dämpfkraft zu verändern.The 1 shows a known from the prior art very simple schematic diagram of a vibratory system in the design of a motor vehicle chassis 1 that at every wheel 3 a vibration damper 5 has, the damping force is variable. A central control unit 7 undertakes the evaluation of sensor signals of a sensor, not shown, on the vibration dampers and wheel acceleration sensors 9 , Based on this, control variables are sent to actuators in or on the vibration damper in order to change the damping force.

Die 2 zeigt einen Schwingungsdämpfer 5 in Verbindung mit einer Fahrzeugfeder 11, die den Schwingungsdämpfer 5 zwischen einem oberen und einem unteren Federteller 13; 15 einhüllt. Die Fahrzeugfeder 11 ist in diesem Fall schräg zur Längsachse des Schwingungsdämpfers angeordnet, wobei die Endwindungen u. U. einen kleineren Durchmesser aufweisen können als mittlere Windungen der Fahrzeugfeder. Innerhalb eines den unteren Federteller 15 tragenden Zylinders 17 ist eine axial bewegliche Kolbenstange 19 angeordnet, die von einer hubabhängigen Zusatzfeder 21 in der Bauform eines Anschlagpuffers aus einem Elastomer und einem Schutzbalg abgedeckt wird.The 2 shows a vibration damper 5 in conjunction with a vehicle spring 11 that the vibration damper 5 between an upper and a lower spring plate 13 ; 15 envelops. The vehicle spring 11 is arranged in this case obliquely to the longitudinal axis of the vibration damper, wherein the end turns u. U. may have a smaller diameter than mean turns of the vehicle spring. Inside one the lower spring plate 15 carrying cylinder 17 is an axially movable piston rod 19 arranged by a stroke-dependent auxiliary spring 21 is covered in the design of a stop buffer made of an elastomer and a protective bellows.

Der Anschlagpuffer 21 weist einen Hohlraum 23 zur Aufnahme mindestens eines Sensormittels 25 auf, das ab einer Grenzposition, bei der der Anschlagpuffer 21 auf einer Stirnfläche 27 des Schwingungsdämpfers 5 zur Anlage kommt, dann ortsfest zum Zylinder eine Relativbewegung zur Kolbenstange 19 ausführt und mit einem zweiten Sensormittel 29, das ortsfest zur Kolbenstangen angeordnet ist, in Kontakt kommt. Ab der Grenzposition liefern die Sensormittel 25; 29 ein 0-1 Ausgangssignal an die Regeleinheit 7 und stellen damit funktional einen Schalter dar. Das Ausgangssignal der Sensormittel 25; 29 eröffnet vielfältige Möglichkeiten. So kann dem Fahrer des Fahrzeugs über eine Warnlampe 31 (1) ein Warnsignal bereitgestellt werden, sobald die Anzahl der aufaddierten Schalterkontakte über einem Schwellwert liegt, da z. B. eine Überladung des Fahrzeugs oder Verschleißerscheinungen an den Schwingungsdämpfern vorliegen.The stop buffer 21 has a cavity 23 for receiving at least one sensor means 25 on, starting from a limit position, at which the An shock buffer 21 on a face 27 of the vibration damper 5 comes to rest, then fixed to the cylinder a relative movement to the piston rod 19 executes and with a second sensor means 29 , which is fixed to the piston rods, comes into contact. From the limit position supply the sensor means 25 ; 29 a 0-1 output signal to the control unit 7 and thus functionally represent a switch. The output signal of the sensor means 25 ; 29 opens up many possibilities. So can the driver of the vehicle via a warning lamp 31 ( 1 ) a warning signal are provided as soon as the number of added switch contacts is above a threshold, since z. As an overload of the vehicle or wear and tear on the vibration are present.

Des weiteren besteht die Möglichkeit, dass die Einstellung für die weichste Dämpfkrafteinstellung als Funktion der Anzahl der Schaltkontakte pro Zeiteinheit eingestellt wird. Mit einer härteren Dämpfkrafteinstellung lässt sich die Ansprechhäufigkeit für den Anschlagpuffer 21 reduzieren, so dass die Krafteinleitung in den Fahrzeugaufbau in den Kraftspitzen abgebaut werden kann.Furthermore, there is the possibility that the setting for the softest Dämpfkrafseinstellung is set as a function of the number of switching contacts per unit time. With a harder damping force setting, the response frequency for the stop buffer can be selected 21 reduce, so that the introduction of force can be reduced in the vehicle body in the force peaks.

Aus der Dauer der Betätigung der Schaltkontakte kann die Fequenz der Wegamplitude abgeschätzt und die Dämpfkrafteinstellung proportional verstellt werden, beispielsweise nach der Regel, kurzer Schaltkontakt = große Einfederungsbelastung = große Dämpfkraft. Es kann je nach eingesetzter Dämpfventilkonstruktion insbesonderer die Druckdämpfung erhöht werden, damit der Fahrzeugaufbau höher steht.Out the duration of the operation the switching contacts can estimate the frequency of the path amplitude and the damping force setting be adjusted proportionally, for example, according to the rule, short Switch contact = large Compression load = large Damping force. It can vary depending on the used Dämpfventilkonstruktion in particular the pressure damping elevated so that the vehicle body is higher.

Mit der Kombination der Sensormittel 25; 29 und den Beschleunigungssensoren 9 kann auf sehr einfache Art auch eine Detektion der Straßenoberfläche erreicht werden.With the combination of sensor means 25 ; 29 and the acceleration sensors 9 can be achieved in a very simple way, a detection of the road surface.

Claims (7)

Verfahren zur Positionserfassung einer Kolbenstange in einem Schwingungsdämpfer, umfassend erste Sensormittel, die ortsfest zur Kolbenstange und zweite Sensormittel, die ortsfest zu einem Zylinder, in dem die Kolbenstange gleitet, angeordnet sind, wobei die Sensormittel im Zusammenwirken mit einer Rechnereinrichtung die Position der Kolbenstange bestimmen, dadurch gekennzeichnet, dass die Sensormittel (25; 29) als Schalter mit einem 0-1-Ausgangssignal ausgeführt sind, das eine Grenzposition der Kolbenstange (19) repräsentiert, wobei aus der Häufigkeit dieser einen Position pro Zeiteinheit der Schwingungsdämpfer (5) in seiner Dämpfkraftcharakteristik verstellbar ist.Method for position detection of a piston rod in a vibration damper, comprising first sensor means fixed to the piston rod and second sensor means fixed to a cylinder in which the piston rod slides, the sensor means, in cooperation with a computer means, determining the position of the piston rod, characterized in that the sensor means ( 25 ; 29 ) are designed as switches with a 0-1 output signal, which is a limit position of the piston rod ( 19 ), wherein from the frequency of this one position per time unit of the vibration damper ( 5 ) is adjustable in its damping force characteristic. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass oberhalb eines definierten Häufigkeitswerts die Dämpfkraftgrundeinstellung in Richtung härtere Dämpfkraft verstellt wird.Method according to claim 1, characterized in that above a defined frequency value the damping force basic setting towards harder damping force is adjusted. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass ein die Kolbenstangenbewegung repräsentierendes Beschleunigungssignal zusammen mit dem Schalter (25; 29) als Maß für die Fahrbahnoberfläche dient.A method according to claim 1, characterized in that an acceleration signal representing the piston rod movement together with the switch ( 25 ; 29 ) serves as a measure of the road surface. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Anzahl der Schalterkontakte aufaddiert wird und ab einem Schwellwert ein Warnsignal bereitgestellt wird.Method according to claim 1, characterized in that that the number of switch contacts is added up and from one Threshold a warning signal is provided. Schwingungsdämpfer nach Anspruch 1, dadurch gekennzeichnet, dass der Schwingungsdämpfer (5) mit einer hubabhängig wirksamen Zusatzfeder (21) ausgeführt ist, die eines der Sensormittel (25; 29) trägt.Vibration damper according to claim 1, characterized in that the vibration damper ( 5 ) with a stroke-dependent additional spring ( 21 ) which is one of the sensor means ( 25 ; 29 ) wearing. Schwingungsdämpfer nach Anspruch 5, dadurch gekennzeichnet, dass die Zusatzfeder (21) von einem Elastomerkörper gebildet wird.Vibration damper according to claim 5, characterized in that the additional spring ( 21 ) is formed by an elastomeric body. Schwingungsdämpfer nach Anspruch 6, dadurch gekennzeichnet, dass der Elastomerkörper (21) einen Hohlraum (23) zur Aufnahme zumindest eines der Sensormittel (25; 29) aufweist.Vibration damper according to claim 6, characterized in that the elastomeric body ( 21 ) a cavity ( 23 ) for receiving at least one of the sensor means ( 25 ; 29 ) having.
DE200510037477 2005-08-09 2005-08-09 Piston rod`s position detecting method for motor vehicle, involves providing sensor units that provide output signal, where position per unit of time of vibration absorber is adjustable in damping force characteristics of absorber Withdrawn DE102005037477A1 (en)

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DE200510037477 DE102005037477A1 (en) 2005-08-09 2005-08-09 Piston rod`s position detecting method for motor vehicle, involves providing sensor units that provide output signal, where position per unit of time of vibration absorber is adjustable in damping force characteristics of absorber

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DE200510037477 DE102005037477A1 (en) 2005-08-09 2005-08-09 Piston rod`s position detecting method for motor vehicle, involves providing sensor units that provide output signal, where position per unit of time of vibration absorber is adjustable in damping force characteristics of absorber

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111433058A (en) * 2017-12-06 2020-07-17 奥迪股份公司 Additional spring for a shock absorber of a motor vehicle and shock-absorbing bearing arrangement for a shock absorber of a motor vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10356402A1 (en) * 2003-12-03 2005-07-07 Zf Friedrichshafen Ag Method for determining the absolute position of a movable component

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10356402A1 (en) * 2003-12-03 2005-07-07 Zf Friedrichshafen Ag Method for determining the absolute position of a movable component

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111433058A (en) * 2017-12-06 2020-07-17 奥迪股份公司 Additional spring for a shock absorber of a motor vehicle and shock-absorbing bearing arrangement for a shock absorber of a motor vehicle

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