WO2007137647A1 - Détermination de la hauteur d'un amortisseur pneumatique selon un procédé de mesure du temps de parcours d'une impulsion - Google Patents

Détermination de la hauteur d'un amortisseur pneumatique selon un procédé de mesure du temps de parcours d'une impulsion Download PDF

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Publication number
WO2007137647A1
WO2007137647A1 PCT/EP2007/002918 EP2007002918W WO2007137647A1 WO 2007137647 A1 WO2007137647 A1 WO 2007137647A1 EP 2007002918 W EP2007002918 W EP 2007002918W WO 2007137647 A1 WO2007137647 A1 WO 2007137647A1
Authority
WO
WIPO (PCT)
Prior art keywords
air spring
radar
end members
spring
antenna
Prior art date
Application number
PCT/EP2007/002918
Other languages
German (de)
English (en)
Inventor
Siegfried Reck
Original Assignee
Contitech Luftfedersysteme Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contitech Luftfedersysteme Gmbh filed Critical Contitech Luftfedersysteme Gmbh
Publication of WO2007137647A1 publication Critical patent/WO2007137647A1/fr

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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/02—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum
    • F16F9/04—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall
    • F16F9/05—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using gas only or vacuum in a chamber with a flexible wall the flexible wall being of the rolling diaphragm type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/0209—Systems with very large relative bandwidth, i.e. larger than 10 %, e.g. baseband, pulse, carrier-free, ultrawideband
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
    • G01S13/50—Systems of measurement based on relative movement of target
    • G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S13/588—Velocity or trajectory determination systems; Sense-of-movement determination systems deriving the velocity value from the range measurement
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • 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
    • B60G2204/111—Mounting of sensors thereon on pneumatic springs
    • 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
    • B60G2401/00—Indexing codes relating to the type of sensors based on the principle of their operation
    • B60G2401/17—Magnetic/Electromagnetic
    • B60G2401/174—Radar

Definitions

  • the invention relates to an air spring - in particular for supporting the structures of a motor vehicle -, wherein the spring height, according to the preamble of claim 1, with the aid of a transit time measuring device can be determined. Moreover, the invention relates to a method for determining the spring height, - according to the preamble of claim 7.
  • An air spring usually has except one bellows (rolling bellows or bellows) two distance variable mutually arranged end members, wherein one of the two end members is chassisrochrex and the other end member is to be attached to the wheel side.
  • one of the two end members is a rolling piston, while the other end member is a (air spring) cover.
  • the currently existing between the end members each clear distance and thus the spring height can be determined.
  • two antennas namely, a transmitting antenna and a receiving antenna
  • it is preferred to proceed according to the pulse-echo method wherein at one of the end members, a transmitter / receiver and at the other end member only a reflector is to be attached.
  • Ultrasonic pulses performed (see, for example, DE 196 48 1 12 Cl and DE 198 11 982 Al).
  • the disadvantage of this acoustic method is the inherent long duration of the echo signal. It results from the maximum distance to be measured and the propagation velocity of the sound in air. At a measuring distance of 500 mm the running time is approx. 3 milliseconds. Measurements during compression and rebounding result in a "smeared" measurement signal, ie an inaccurate measurement result. Injection and rebound velocities, injection and rebound amplitudes and frequencies can not be determined exactly by ultrasound pulse transit time measurements.
  • a further disadvantage of ultrasonic transit time measurements is that the speed of the sound depends on the internal pressure of the air spring bellows and on the current temperature in the air spring.
  • the measurement of the air spring height takes place with the aid of electrical cavity resonance.
  • the frequency of the cavity resonance in the air spring depends not only on the spring height but also on the diameter of the air spring. Practical tests on hose bladders have shown the influence of the diameter on the measurement result.
  • the object of the invention is to provide a height measuring device for air springs, in which - in contrast to the known ultrasonic measuring devices - can be dispensed with an additional measurement and consideration of bellows internal pressure and temperature.
  • a further object of the invention is a determination of the on / Ausfederungs Anlagen.
  • Radar pulse transit time measuring device extremely precise measured values.
  • the propagation speed is greater by several orders of magnitude for radar than for ultrasound.
  • the repetition rate can be correspondingly larger. Since the electronics are able to work in the picosecond range, a high repetition rate with steep rising edges can also be practically realized.
  • the differential quotient or the differential quotient is formed in continuation of the invention, whereby the input / output swing speed is given.
  • the oscillation frequency and oscillation amplitude are to a certain extent automatic.
  • the measuring signals of the measured variable can be delivered in the manner of negative feedback to a spring / damper control.
  • the rolling bellows air spring shown in the drawings and subsequently described is not a limitation of the invention.
  • the measuring device forming the core of the invention may as well be part of a bellows air spring or an air spring strut. It shows:
  • FIG. 1 shows a rolling bellows invention air spring in longitudinal section with a radar transmitter / receiver in the air spring cover.
  • FIG. 2 shows a modification of the rolling bellows air spring shown in FIG. 1, likewise in longitudinal section; FIG. wherein a radar transmitter / receiver is located on the air spring rolling piston; and
  • Fig. 3 is a block diagram of a further embodiment of the radar pulse measuring device according to the invention.
  • the rolling bellows air springs 2 shown in longitudinal section in FIGS. 1 and 2 each have a conventional basic construction.
  • Essential components of these two rolling bellows air springs 2 are each an air spring rolling bellows 4, each with two spaced apart mutually arranged end members 6, 8, which in each case together enclose a pneumatic spring interior 10.
  • This in Figures 1 and 2 respectively above shown end member 6 is an air spring cover (cover plate, connection plate) and each end member 8 shown below is an air spring rolling piston.
  • the respective air spring cover 6 are axially fixed by means of a support member 12 to the vehicle chassis (not shown), while the rolling piston 8 are usually arranged in each case the wheel side.
  • the air spring interior 10 facing bottoms of the rolling piston 8 are each provided with a rubber buffer 14.
  • the air spring 2 has a pulse transit time measuring device.
  • the essential components of this measuring device are a radar transmitter 16a with a first electronics 18a for generating a broadband, pulsed radar signal 32 pulse generator 28) (FIG. 3) and a transmitting antenna 20a.
  • a radar receiver 16b having a second electronics 18b and a receiving antenna 20b.
  • the electronics 18b may include a pulse detector, a timer, and a signal processor.
  • the first 18a and the second electronics 18b form a common electronic component 18a / 18b, and the transmitting 20a and the receiving antenna 20b are identical (radar antenna 20a / 20b).
  • radar transmitters 16a and radar receivers 16b form a unitary radar transmitter / receiver 16a / 16b.
  • the air spring cover 6 of the rolling bellows air spring 2 shown in FIG. 1 has a bore (passage) for receiving such a radar transceiver assembly 16a / 16b.
  • This assembly 16a / 16b is provided with a connection plug 22 for the power supply of the electronics 18a / 18b and for the connection of signal lines.
  • the bore is arranged eccentrically in the air spring cover 6.
  • a transmitting / receiving antenna 20a / 20b is sufficient, a single-pole antenna of about 4 centimeters in length.
  • the antenna 20a / 20b may be both a rod oriented in the direction of the distance to be measured (FIG.
  • a single-pole stub antenna 20a / 20b which projects through the cover plate 6 radiates a very broadband (ultra-wide-band) radar signal 32a (FIG. 3) into the air spring interior 10.
  • This signal is reflected by the opposing air spring piston 8 or by the (rubber) buffer 14 ("reflector" 30) .
  • the distance between the cover plate 6 and 6 can be determined from the transit time of the reflected signal 32b (FIG
  • the piston 8 or the buffer 14 has a radar-reflecting surface
  • the material of this surface (s) does not necessarily have to be a metal When using plastic, care must be taken that its dielectric constant is sufficiently greater as the corresponding value for air.
  • the antenna 20a / 20b is here not rod-shaped but flat and oriented transversely to the direction of propagation.
  • an antenna reflector 24 is located behind the antenna 20a / 20b.
  • the radar pulses 32a (FIG. 3) emitted by this antenna 20a / 20b are reflected by the cover plate 6 of the air spring 2 in this case
  • the measured results are transmitted via a radio interface to an external control device (not shown) (eg 433 MHz, ISM band) .
  • the energy for the operation of these radar transceivers is (reflected signal 32b (FIG. Assembly 16a / 16b is provided by a battery 26. After radiation of a transmit pulse 32a (FIG. 3), the antenna 20a / 20b is moved to the
  • the radiated signal 32a ( Figure 3) is preferably a wideband radar signal with a nominal repetition rate of 2 million per second.
  • the radar transmitter 16a is configured as a receiver 16b
  • the measuring device is capable of detecting, ie receiving and evaluating, the echoes 32b of its own signals 32a (FIG. 3).
  • the pulses are short and preferably have a rise time of 5 10 "1 1 seconds (50 picoseconds) to.
  • the measuring device is capable of are even a few centimeters in front of the transmitter / receiver 16a 16b located close range / as well as the more distant Determine area exactly.
  • the delay range ie the "time window" for receiving the echoes 32b ( Figure 3) is tuned to the minimum and maximum possible dimensions of the air spring 2.
  • the inside of the air spring bellows 4 can only be weak Reflective material or be provided with an anti-reflective coating.
  • FIG. 3 The block diagram (FIG. 3) of the further embodiment of the radar pulse measuring device according to the invention initially shows the essential ones
  • Modules of the basic structure include: a pulse generator 28 for generating a pulsed radar signal, a transmitter 16a for emitting 32a of the pulsed radar signal 32 in the air spring interior 10, a reflector 30 which reflects the radar signal 32 (reflected signal, echo 32b), a receiver 16b for receiving the reflected radar signal 32b.
  • a pulse generator 28 for generating a pulsed radar signal
  • a transmitter 16a for emitting 32a of the pulsed radar signal 32 in the air spring interior 10
  • a reflector 30 which reflects the radar signal 32 (reflected signal, echo 32b)
  • a receiver 16b for receiving the reflected radar signal 32b.
  • there is an evaluation Elektronikl ⁇ b comprising in the present embodiment, a controllable delay line 34, a sampler 36 and an averager 38, with the help of the running time of the (reflected) radar signal 32, the distance (measurement distance) between transmitter / receiver 16a / 16b and reflector 30 and thus the spring height can be determined.
  • the essential component of Rothbowung consists in a differentiator 40, by means of which the difference quotient or the differential quotient of successive height measurements can be formed.
  • This difference quotient or this differential quotient indicates the instantaneous in / rebound speed of the air spring 2.
  • Air spring end links 6 Air spring cover, cover plate, connection plate

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

L'amortisseur (2) pneumatique selon l'invention se compose pour l'essentiel d'un soufflet (4) déroulant ou pliant et de deux éléments d'extrémité (6, 8) qui sont disposés à distance variable l'un de l'autre et entourent un espace (10) intérieur d'amortisseur pneumatique. La hauteur ainsi que la vitesse de compression/de débattement du ressort sont déterminées à partir de l'écart entre les deux éléments d'extrémité (6, 8) et à partir de leur mouvement relatif l'un par rapport à l'autre. Un tel dispositif de mesure présente de préférence un émetteur/récepteur radar (16a/16b) et un réflecteur (30), l'émetteur/récepteur radar (16a/16b) étant monté sur l'un des éléments d'extrémité (6 ou 8) et le réflecteur (30) sur l'autre (8 ou 6). Une électronique (18a) d'émission génère un signal radar (32; 32a, 32b) pulsé à large bande qui est diffusé dans l'espace (10) intérieur de l'amortisseur (2) pneumatique par le biais d'une antenne émettrice(20a). Le récepteur (16a) présente une antenne (20b) pour recevoir l'impulsion radar (32; 32a, 32b) réfléchie par le réflecteur (30) et une deuxième électronique (18b) pour l'interprétation du signal. L'électronique (18b) d'interprétation présente un élément (40) différenciateur pour déterminer la vitesse de compression/débattement de l'amortisseur (2).
PCT/EP2007/002918 2006-05-31 2007-03-31 Détermination de la hauteur d'un amortisseur pneumatique selon un procédé de mesure du temps de parcours d'une impulsion WO2007137647A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006025326.4 2006-05-31
DE102006025326.4A DE102006025326B4 (de) 2006-05-31 2006-05-31 Bestimmung der Federhöhe einer Luftfeder nach einem Impuls-Laufzeitmessverfahren

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WO2007137647A1 true WO2007137647A1 (fr) 2007-12-06

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WO (1) WO2007137647A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103376201A (zh) * 2012-04-19 2013-10-30 南车青岛四方机车车辆股份有限公司 空气弹簧失效过程模拟实验方法及装置
DE102022124631A1 (de) 2022-09-26 2024-03-28 Zf Cv Systems Global Gmbh Einrichtung zur Messung der Karosseriehöhe

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008033820B4 (de) 2008-07-19 2015-06-25 Audi Ag Kraftfahrzeug mit aktiver Federung
DE102010037686A1 (de) 2010-09-21 2012-03-22 Contitech Luftfedersysteme Gmbh Sende- und/oder Empfangseinrichtung zum Einbau in elastische Strukturen
CN108931383B (zh) * 2018-07-12 2019-12-03 安徽悦众车身装备有限公司 一种汽车保险杠的检测安装方法

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DE3423602A1 (de) * 1984-06-27 1986-01-09 Robert Bosch Gmbh, 7000 Stuttgart Messvorrichtung fuer den abstand zwischen der karosserie und der achse eines fahrzeugs
DE19648112C1 (de) * 1996-11-21 1998-03-05 Contitech Luftfedersyst Gmbh Einrichtung zur berührungslosen Abstandsmessung
DE19700966C1 (de) * 1997-01-14 1998-04-23 Contitech Luftfedersyst Gmbh Einrichtung zur berührungslosen Abstands- und Druckmessung innerhalb einer Luftfeder
DE19701530C1 (de) * 1997-01-17 1998-08-06 Contitech Luftfedersyst Gmbh Einrichtung zur Bestimmung des axialen Abstandes zweier Endglieder einer Gasdruckfeder
DE19710311A1 (de) * 1997-03-13 1998-09-17 Opel Adam Ag Schwingungsdämpfer für Kraftfahrzeuge
EP0924115A1 (fr) * 1997-12-22 1999-06-23 BRIDGESTONE/FIRESTONE, Inc. Ressort pneumatique comprenant une partie active et un dispositif de suspension et procédé utilisant celui-ci
DE10025631A1 (de) * 2000-05-24 2001-12-06 Continental Ag Verfahren zur hochgenauen Niveau-Messung in einer Kraftfahrzeug-Luftfeder
EP1199196A2 (fr) * 2000-10-19 2002-04-24 ContiTech Luftfedersysteme GmbH Système de suspension à air pour véhicules avec arrangement de mesure par ultrasons
US20020189336A1 (en) * 2001-06-15 2002-12-19 Mcewan Technologies, Llc Radar monitoring system for tires and wheels
EP1295737A2 (fr) * 2001-09-25 2003-03-26 KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH Détermination de hauteur et pression d'éléments de ressort, notamment ressorts à air, pour véhicule
EP1308750A2 (fr) * 2001-10-18 2003-05-07 ContiTech Luftfedersysteme GmbH Procédé et dispositif de mesure de distance et de pression dans l'intérieur d'un ressort pneumatique
EP1522431A2 (fr) * 2003-10-08 2005-04-13 Hitachi, Ltd. Dispositif de suspension de véhicule
EP1526014A1 (fr) * 2003-10-24 2005-04-27 ContiTech Luftfedersysteme GmbH Ressort à air avec système de mesure par ultrasons
EP1542035A1 (fr) * 2003-12-09 2005-06-15 Société de Technologie Michelin Radar Doppler pour détecter des anomalies de pneus
WO2006089775A1 (fr) * 2005-02-24 2006-08-31 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Dispositif de detection servant a mesurer le debattement et/ou la vitesse de deflexion de roues et/ou d'axes de vehicules

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DE19811982C5 (de) * 1998-03-19 2011-02-03 Microsonic Gesellschaft für Mikroelektronik und Ultraschalltechnik mbH Ultraschall-Luftfederanordnung

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3423602A1 (de) * 1984-06-27 1986-01-09 Robert Bosch Gmbh, 7000 Stuttgart Messvorrichtung fuer den abstand zwischen der karosserie und der achse eines fahrzeugs
DE19648112C1 (de) * 1996-11-21 1998-03-05 Contitech Luftfedersyst Gmbh Einrichtung zur berührungslosen Abstandsmessung
EP0844116A1 (fr) * 1996-11-21 1998-05-27 ContiTech Luftfedersysteme GmbH Système à ressort pneumatique pour un véhicule automobile
DE19700966C1 (de) * 1997-01-14 1998-04-23 Contitech Luftfedersyst Gmbh Einrichtung zur berührungslosen Abstands- und Druckmessung innerhalb einer Luftfeder
DE19701530C1 (de) * 1997-01-17 1998-08-06 Contitech Luftfedersyst Gmbh Einrichtung zur Bestimmung des axialen Abstandes zweier Endglieder einer Gasdruckfeder
DE19710311A1 (de) * 1997-03-13 1998-09-17 Opel Adam Ag Schwingungsdämpfer für Kraftfahrzeuge
EP0924115A1 (fr) * 1997-12-22 1999-06-23 BRIDGESTONE/FIRESTONE, Inc. Ressort pneumatique comprenant une partie active et un dispositif de suspension et procédé utilisant celui-ci
DE10025631A1 (de) * 2000-05-24 2001-12-06 Continental Ag Verfahren zur hochgenauen Niveau-Messung in einer Kraftfahrzeug-Luftfeder
EP1199196A2 (fr) * 2000-10-19 2002-04-24 ContiTech Luftfedersysteme GmbH Système de suspension à air pour véhicules avec arrangement de mesure par ultrasons
US20020189336A1 (en) * 2001-06-15 2002-12-19 Mcewan Technologies, Llc Radar monitoring system for tires and wheels
EP1295737A2 (fr) * 2001-09-25 2003-03-26 KNORR-BREMSE SYSTEME FÜR NUTZFAHRZEUGE GmbH Détermination de hauteur et pression d'éléments de ressort, notamment ressorts à air, pour véhicule
EP1308750A2 (fr) * 2001-10-18 2003-05-07 ContiTech Luftfedersysteme GmbH Procédé et dispositif de mesure de distance et de pression dans l'intérieur d'un ressort pneumatique
EP1522431A2 (fr) * 2003-10-08 2005-04-13 Hitachi, Ltd. Dispositif de suspension de véhicule
EP1526014A1 (fr) * 2003-10-24 2005-04-27 ContiTech Luftfedersysteme GmbH Ressort à air avec système de mesure par ultrasons
EP1542035A1 (fr) * 2003-12-09 2005-06-15 Société de Technologie Michelin Radar Doppler pour détecter des anomalies de pneus
WO2006089775A1 (fr) * 2005-02-24 2006-08-31 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Dispositif de detection servant a mesurer le debattement et/ou la vitesse de deflexion de roues et/ou d'axes de vehicules

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103376201A (zh) * 2012-04-19 2013-10-30 南车青岛四方机车车辆股份有限公司 空气弹簧失效过程模拟实验方法及装置
DE102022124631A1 (de) 2022-09-26 2024-03-28 Zf Cv Systems Global Gmbh Einrichtung zur Messung der Karosseriehöhe

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DE102006025326A1 (de) 2007-12-06

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