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EP0309729A2 - Système d'alimentation à deux pressions dans un véhicule - Google Patents

Système d'alimentation à deux pressions dans un véhicule Download PDF

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Publication number
EP0309729A2
EP0309729A2 EP88113675A EP88113675A EP0309729A2 EP 0309729 A2 EP0309729 A2 EP 0309729A2 EP 88113675 A EP88113675 A EP 88113675A EP 88113675 A EP88113675 A EP 88113675A EP 0309729 A2 EP0309729 A2 EP 0309729A2
Authority
EP
European Patent Office
Prior art keywords
pressure
supply system
valve
line
vacuum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88113675A
Other languages
German (de)
English (en)
Other versions
EP0309729A3 (en
EP0309729B1 (fr
Inventor
Horst Holzhauer
Wolfgang Schneider
Günther Weikert
Rudi Kneib
Josef Schumacher
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.)
Daimler Benz AG
Original Assignee
Daimler Benz AG
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 Daimler Benz AG filed Critical Daimler Benz AG
Publication of EP0309729A2 publication Critical patent/EP0309729A2/fr
Publication of EP0309729A3 publication Critical patent/EP0309729A3/de
Application granted granted Critical
Publication of EP0309729B1 publication Critical patent/EP0309729B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3111—Neutral or centre positions the pump port being closed in the centre position, e.g. so-called closed centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/55—Pressure control for limiting a pressure up to a maximum pressure, e.g. by using a pressure relief valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/555—Pressure control for assuring a minimum pressure, e.g. by using a back pressure valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/80—Other types of control related to particular problems or conditions
    • F15B2211/89—Control specific for achieving vacuum or "negative pressure"

Definitions

  • the invention relates to a bi-pressure supply system with the features of the preamble of patent claim 1.
  • a generic bi-pressure supply system is known (DE-PS 32 43 411).
  • the electrically driven air pump described in the cited document (FIG. 1 of DE-PS) has an overpressure and a vacuum connection. From each connection, a line leads to a pneumatically switchable 4/2-way valve which, depending on its switching position, connects central locking actuators to overpressure or underpressure as a whole group.
  • an electromagnetically switchable 3/2-way valve for alternately connecting the central locking control elements or a pure positive pressure consumer (backrest air cushion) is connected to the positive pressure connection of the air pump.
  • the pressure line branch has a setback valve, a pressure control valve and a storage container as well as a pressure monitoring switch. When the ignition is switched on, the latter ensures that the required pressure level in the storage tank is maintained by automatically controlling the air pump drive motor.
  • pressure generators are already known from DE-OS 2 232 956 and from US Pat. No. 3,096,112, which simultaneously generate underpressure and overpressure and - according to DE-OS - simultaneously apply pressure to both consumers (brake booster) with both types of pressure for strengthening or - according to the US PS - apply two consumers with negative pressure and two other consumers with positive pressure simultaneously.
  • all consumers in the US-PS are central locking control elements that are always operated simultaneously and in the same direction.
  • the object of the invention is to design a generic bi-pressure supply system in such a way that the control of the pressure generator and the pressure distribution to a wide variety of consumers are simplified in order to increase the flexibility of the system.
  • An example of a simultaneous need for overpressure and underpressure is the case when a motor vehicle with a bi-pressure central locking system (ZV) and a pneumatic door seal (PTD) is to be unlocked.
  • ZV bi-pressure central locking system
  • PTD pneumatic door seal
  • the ZV is pressurized, while the PTD requires vacuum to loosen the sealing hoses.
  • the bi-pressure supply system according to the invention longer waiting times are no longer expected of the vehicle user.
  • the pressure distribution can be controlled in a conventional manner by simple electrical control of the pressure generator on the one hand - if required - and a directional control valve or several directional control valves on the other - depending on the individual needs of the consumer - by means of electrical switches assigned to the consumers.
  • a pressure generator 1 contains a pressure pump 2 and a vacuum pump 3, which are driven together by an electric motor, not shown.
  • a pressure line system 4 is connected to the pressure connection of the pressure pump 2 and a vacuum line system 5 is connected to the suction connection of the vacuum pump 3.
  • a limit switch and a pressure monitoring switch 6 are provided in the overpressure line system 4 and a limit switch and a vacuum monitoring switch 7 are provided in the vacuum line system 5.
  • a safety relief valve 8 is provided, which also functions as a pressure check valve 8 '(Fig. 2a).
  • a safety suction valve 9 with vacuum check valve function 9 '(FIG. 2b) is installed analogously.
  • an overpressure line branch 4.1 with a reservoir 4.2 for pure overpressure consumers for example an orthopedic backrest OL
  • an overpressure line branch 4.1 with a reservoir 4.2 for pure overpressure consumers for example an orthopedic backrest OL
  • an overpressure line branch 4.1 with a reservoir 4.2 for pure overpressure consumers for example an orthopedic backrest OL
  • an overpressure line branch 4.1 with an expansion tank 5.2 for pure vacuum consumers for example an air conditioning flap control KL.
  • Branches 4.3 / 5.3, 4.4 / 5.4 and 4.5 / 5.5 lead in pairs to inputs of an electromagnetically switchable 4/3-way valve 11.
  • These 4/3-way valves 11 close individual consumer lines 12 depending on their activation at the respective transfer or Vacuum branch on. In the - middle - rest position of the 4/3-way valves 11, however, the individual consumer lines are connected to atmospheric pressure via the fourth valve path.
  • central locking (ZV) and anti-theft (DSA) actuators and pneumatic door seals (PTD) are provided as consumer groups connected to the individual consumer lines, i.e. all consumers of overpressure and underpressure.
  • a pressure limiter 13 is connected upstream of the consumer group PTD in the relevant individual line 12. With such pressure limiters, the pressure specified in the bi-pressure supply system by the pump output can be adapted for individual consumers / groups.
  • control switches 14 changeover buttons with a neutral central position.
  • the control switches 14 also emit control pulses for the 4/3-way valves 11 or for their drives - for example double coils - so that, in addition to starting the pressure generator, the associated 4/3-way valve also switches to the required switching position , which is specified by the respective change button setting, is moved.
  • the symbols for diodes on the 4/3-way valves indicate that a control of other consumers has no influence on the 4/3-way valves 11.
  • the consumer group ZV is optionally - with dashed lines - assigned further control switches parallel to control switch 14: - a change button 14 'for internal actuation of the central locking, - An infrared receiver 14 ⁇ a remote control and - An emergency release switch 14 ′′′ for unlocking a centrally locked vehicle in the event of an impact.
  • control groups can also be assigned control options in a comparatively simple manner.
  • the 4/3-way valves 11 are electrically connected to a control circuit 15 of the pressure generator 1 via two separate line sets 16 and 17. These line sets make it possible to determine the limit switch relevant for the end shutdown of the pressure generator 1, 6 in the overpressure range and 7 in the underpressure range in parallel with the activation of the pressure generator 1. Since a reversal of the direction of rotation of the pressure generator drive is not necessary, the electrical control can also advantageously be done with dashed lines using only a single line set 16 'if the limit switches 6 and 7 are interconnected in a logical AND operation so that the pressure generator 1 only after the response both limit switches 6 and 7 are stopped. The cable sets 16 and 17 can then be omitted.
  • the pressure generator 1 is controlled automatically by the limit switches 6 and 7, which are also designed as pressure monitoring switches (for overpressure or underpressure), in a known manner as in the generic state of the art. Because when the 4/2-way valve 10 is open in retirement, the respective container pressure acts on the limit switches 6 and 7, because these are sealed off by the check valves 8 'and 9' against the pressure generator 1 when it is at a standstill.
  • the 4/2-way valve 10 is immediately switched into its blocking position. Via a thinly drawn line set 18, the control circuit 15 is connected in parallel to the line sets 16 and 17 or 16 'with the drives of the 4/3-way valves 11. This indicates that the directional control valves 11 are held in the respective switching position by the control circuit 15 after the pulse-like activation by the two-way control switch 14 with plus potential until the pressure generator 1 is switched off. The same applies to the 4/2-way valve 10. If necessary, a delayed return of the directional valves 10 and 11 to their respective rest or middle position can be provided.
  • FIG 2a shows a detail of Figure 1, the pressure relief valve 8 with check valve function 8 'in a schematic diagram.
  • a valve body 8.2 is arranged to be displaceable against the bias of a spring 8.3.
  • the valve body 8.2 has a latching curve 8.21, into which a spring-loaded latching plunger 8.22 can fall into two latching positions when the valve body is displaced from its drawn rest position. The two locking positions prevent the valve body 8.2 from vibrating when the pressure is applied transiently.
  • the pressure pump 2 is connected to a pressure connection 8.4, a consumer connection 8.5 leads to the limit switch 6 or to the 4/2 way valve 10.
  • p atm atmospheric pressure
  • the valve body 8.2 is shifted to the right and releases the consumer connection 8.5, the latching plunger 8.22 being omitted in the first, stronger latching position of the latching curve 8.21.
  • Figure 2b also shows as a detail from Figure 1, the vacuum suction and check valve 9,9 'in a basic representation.
  • a valve housing 9.1 encloses a valve body 9.2 with a locking curve 9.21 for a locking plunger 9.22 and a return spring 9.3 and also has a vacuum control connection 9.41, a vacuum supply connection 9.42, - A consumer connection 9.5 and - A ventilation nozzle 9.6 with an inserted air filter 9.7.
  • the two connections 9.41 and 9.42 are equally subjected to negative pressure (p u ) during operation of the pressure generator 1.
  • the valve body 9.2 Upon the force of the return spring 9.3, the valve body 9.2 is then moved from its drawn rest position (vacuum check valve 9 'closed) to the left and releases a connection between the vacuum supply connection 9.42 and the consumer connection 9.5.
  • the locking plunger 9.22 falls into the first, stronger locking position of the locking curve 9.21.
  • the valve body 9.2 is pulled further to the left and thereby releases the ventilation nozzle 9.6.
  • the consumer connection 9.5 is already covered again, so that the limit switch and pressure monitoring switch 7 cannot be ventilated, but only the vacuum supply connection 9.42 is ventilated (p atm ) via the annular groove of the valve body 9.2.
  • the locking plunger 9.22 lies in the second, weaker locking position of the locking curve 9.21.
  • the preload force of the locking plungers 8.22 and 9.22 can be adjusted by hand on both valves 8 and 9 as required
  • Limit switches 6 and 7 still have atmospheric connections with flow restrictors, either in a separate arrangement or preferably in such a way that in the valve body 8.2, 9.2 of the check and safety valves 8 ', 8 and 9', 9 sintering restrictors are integrated so that at least one Gradual venting or ventilation of the respective consumer connection 8.5 or 9.5 can take place via the atmosphere connections 8.6, 9.6 provided anyway. Any "locked" overpressure or underpressure is compensated.
  • FIG. 3 shows a schematic representation of the pressure generator 1 with overpressure pump 2 and underpressure pump 3 as well as a pneumatic / electrical distributor 19, in which, for example, five 4/3-way valves 11 are inserted under known pneumatic and electrical contacting.
  • the individual consumer lines 12 are laid starting from the centrally arranged distributor 19 to the respective individual consumers or with further branching to consumer groups.
  • variable numbers of directional control valves can also be supplied with the same distributor in an advantageous manner, depending on the scope of equipment of the motor vehicle.
  • Locally mounting directional control valves is e.g. with limited installation space, of course also possible, whereby extension lines with pneumatic / electrical connectors can also be used to advantage.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
  • Hydraulic Control Valves For Brake Systems (AREA)
EP88113675A 1987-10-01 1988-08-23 Système d'alimentation à deux pressions dans un véhicule Expired - Lifetime EP0309729B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3733212 1987-10-01
DE3733212A DE3733212C1 (de) 1987-10-01 1987-10-01 Bidruckversorgungssystem in einem Kraftfahrzeug

Publications (3)

Publication Number Publication Date
EP0309729A2 true EP0309729A2 (fr) 1989-04-05
EP0309729A3 EP0309729A3 (en) 1989-07-26
EP0309729B1 EP0309729B1 (fr) 1991-12-04

Family

ID=6337404

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113675A Expired - Lifetime EP0309729B1 (fr) 1987-10-01 1988-08-23 Système d'alimentation à deux pressions dans un véhicule

Country Status (5)

Country Link
US (1) US4939899A (fr)
EP (1) EP0309729B1 (fr)
JP (1) JPH01112001A (fr)
DE (1) DE3733212C1 (fr)
ES (1) ES2028962T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647858A1 (fr) * 1989-06-02 1990-12-07 Daimler Benz Ag Procede et appareillage pour enlever un condensat liquide d'un systeme a air comprime

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3926428A1 (de) * 1989-08-10 1991-02-14 Audi Ag Vorrichtung zum versorgen von pneumatischen einrichtungen in kraftfahrzeugen
DE4117739A1 (de) * 1991-05-30 1992-12-03 Daimler Benz Ag Selbsttaetige schaltvorrichtung eines mehrgaengigen zahnraederwechselgetriebes
DE4210049C1 (en) * 1992-03-27 1993-04-01 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De Pressure supply installation for at least two adjusters in motor vehicle - provides two pressure levels via pressure limit valve placed in switching positions in dependence on pressure level arriving from pressure generator
DE4309839C1 (de) * 1993-03-26 1994-06-23 Daimler Benz Ag Ansteuerung von Unterdruck-Stellelementen einer Fahrzeug-Klimaanlage
US5701051A (en) * 1996-02-15 1997-12-23 Lin; Blake Miniature lamp
DE10059531A1 (de) * 2000-11-30 2002-06-06 Still Gmbh Hydrauliksystem für ein Arbeitsfahrzeug
US6490960B1 (en) * 2001-07-11 2002-12-10 Xerox Corporation Muscle-emulating PC board actuator
DE102006040203A1 (de) * 2006-08-28 2008-03-06 GM Global Technology Operations, Inc., Detroit Aktuator für eine aktive Haube
CN103105473A (zh) * 2012-11-06 2013-05-15 苏州聚阳环保科技有限公司 一种水质检测仪的进样系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096112A (en) * 1961-11-14 1963-07-02 Gen Motors Corp Coincidental door locking system
DE2232956A1 (de) * 1972-07-05 1974-01-17 Daimler Benz Ag Pneumatische anlage zur beaufschlagung von membrangesteuerten arbeitselementen
FR2408056A1 (fr) * 1977-11-05 1979-06-01 Bosch Gmbh Robert Commande centrale pour differents organes hydrauliques d'un vehicule
DE3243411A1 (de) * 1982-11-24 1984-05-24 Daimler-Benz Ag, 7000 Stuttgart Pneumatische zentralverriegelungsanlage fuer die tueren, klappen oder dergleichen eines kraftfahrzeuges

Family Cites Families (9)

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Publication number Priority date Publication date Assignee Title
US2243036A (en) * 1939-08-19 1941-05-20 Trico Products Corp Accessory system for motor vehicles
US3163985A (en) * 1962-07-31 1965-01-05 John V Bouyoucos Hydraulic energy storage system
DE2715136A1 (de) * 1977-04-05 1978-10-19 Daimler Benz Ag Pneumatik-system fuer eine durch ein stroemendes medium betaetigte zentralverriegelung fuer kraftfahrzeuge
DE2742666A1 (de) * 1977-09-22 1979-04-05 Daimler Benz Ag Pneumatische betaetigungsanordnung, insbesondere fuer zentralverriegelungsanlagen, und umschaltventil dafuer
DE2805004A1 (de) * 1978-02-06 1979-08-09 Vdo Schindling Einrichtung zum ent- und verriegeln von tueren, insbesondere von kraftfahrzeugtueren
DE2826354A1 (de) * 1978-06-16 1979-12-20 Daimler Benz Ag Pneumatische zentralverriegelung von tueren und klappen von kraftfahrzeugen
US4412416A (en) * 1980-10-20 1983-11-01 General Motors Corporation Altitude compensated vacuum supply system and control
DE3109200A1 (de) * 1981-03-11 1982-09-23 Westfälische Metall Industrie KG Hueck & Co, 4780 Lippstadt Vorrichtung zur versorgung verschiedener verbraucher von unterdruck in einem kraftfahrzeug
DE3644736C2 (de) * 1985-12-30 1996-01-11 Rexroth Mannesmann Gmbh Steueranordnung für mindestens zwei von mindestens einer Pumpe gespeiste hydraulische Verbraucher

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096112A (en) * 1961-11-14 1963-07-02 Gen Motors Corp Coincidental door locking system
DE2232956A1 (de) * 1972-07-05 1974-01-17 Daimler Benz Ag Pneumatische anlage zur beaufschlagung von membrangesteuerten arbeitselementen
FR2408056A1 (fr) * 1977-11-05 1979-06-01 Bosch Gmbh Robert Commande centrale pour differents organes hydrauliques d'un vehicule
DE3243411A1 (de) * 1982-11-24 1984-05-24 Daimler-Benz Ag, 7000 Stuttgart Pneumatische zentralverriegelungsanlage fuer die tueren, klappen oder dergleichen eines kraftfahrzeuges

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647858A1 (fr) * 1989-06-02 1990-12-07 Daimler Benz Ag Procede et appareillage pour enlever un condensat liquide d'un systeme a air comprime

Also Published As

Publication number Publication date
EP0309729A3 (en) 1989-07-26
JPH01112001A (ja) 1989-04-28
DE3733212C1 (de) 1989-03-02
ES2028962T3 (es) 1992-07-16
EP0309729B1 (fr) 1991-12-04
US4939899A (en) 1990-07-10

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