DE10053586A1 - Pressure generator for hydraulic systems in motor vehicles has hydraulic pump and parallel valve opened/closed by pressure measuring device, dependent upon pressure - Google Patents

Pressure generator for hydraulic systems in motor vehicles has hydraulic pump and parallel valve opened/closed by pressure measuring device, dependent upon pressure

Info

Publication number
DE10053586A1
DE10053586A1 DE2000153586 DE10053586A DE10053586A1 DE 10053586 A1 DE10053586 A1 DE 10053586A1 DE 2000153586 DE2000153586 DE 2000153586 DE 10053586 A DE10053586 A DE 10053586A DE 10053586 A1 DE10053586 A1 DE 10053586A1
Authority
DE
Germany
Prior art keywords
pressure
hydraulic
valve
measuring device
accumulator
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.)
Withdrawn
Application number
DE2000153586
Other languages
German (de)
Inventor
Joerg Kreft
Carsten Semmler
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.)
Volkswagen AG
Original Assignee
Volkswagen 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 Volkswagen AG filed Critical Volkswagen AG
Priority to DE2000153586 priority Critical patent/DE10053586A1/en
Publication of DE10053586A1 publication Critical patent/DE10053586A1/en
Withdrawn legal-status Critical Current

Links

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
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • 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
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/02—Arrangements of pumps or compressors, or control devices therefor
    • 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
    • B60T8/34—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 having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—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 having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/404—Control of the pump unit
    • B60T8/4054—Control of the pump unit involving the delivery pressure control
    • 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
    • B60T8/34—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 having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—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 having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The system consists of tank, continuous hydraulic pump, back pressure valve, hydraulic accumulator, and consumer. A valve (8) positioned parallel to the pump (3) is actuated by a pressure measuring device (7) associated with the accumulator (5), dependent upon the measured pressure. A defined oil volume is continuously fed through the pump, the pressure in the accumulator is continuously measured, the valve is opened by the pressure measurer, if the pressure in the accumulator exceeds a first threshold value, or the valve is closed if the pressure falls below a second threshold value.

Description

Die Erfindung betrifft eine Druckversorgungseinrichtung für hydraulische Systeme in einem Kraftfahrzeug gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a pressure supply device for hydraulic Systems in a motor vehicle according to the preamble of Claim 1.

Eine derartige Druckversorgungseinrichtung wird beispielsweise zur Ansteuerung der hydraulischen Bremszylinder verwendet. Zur permanenten Bereitstellung eines ausreichenden Druckes, um jederzeit ausreichend Bremsdruck aufbauen zu können, fördert die Hydraulikpumpe kontinuierlich ein definiertes Ölvolumen. Zum Schutz der in der Druckversorgungseinrichtung angeordneten Komponenten ist im Hauptkreis ein Überdruckventil angeordnet, das bei Überschreiten eines Grenzdruckes den Ölstrom in den Tank leitet. Nachteilig an der bekannten Druckversorgungseinrichtung ist der hohe Energieverbrauch der Hydraulikpumpe, der entsprechend das Kraftfahrzeugbordnetz belastet.Such a pressure supply device is used, for example Control of the hydraulic brake cylinder used. For permanent Providing sufficient pressure to be sufficient at all times The hydraulic pump continuously delivers the ability to build up brake pressure a defined volume of oil. To protect the in the Pressure supply device arranged components is in the main circuit a pressure relief valve arranged when a limit pressure is exceeded directs the oil flow into the tank. A disadvantage of the known Pressure supply device is the high energy consumption of the Hydraulic pump that loads the vehicle electrical system accordingly.

Der Erfindung liegt daher das technische Problem zugrunde, eine Druckversorgungseinrichtung und ein Verfahren zu deren Ansteuerung zu schaffen, mittels derer der elektrische Energieverbrauch reduziert wird, ohne die Ansprechzeiten der Druckversorgungseinrichtung merklich zu reduzieren.The invention is therefore based on the technical problem, a Pressure supply device and a method for controlling it create, by means of which the electrical energy consumption is reduced without the response times of the pressure supply device increase noticeably to reduce.

Die Lösung des technischen Problems ergibt sich durch die Gegenstände mit den Merkmalen der Patentansprüche 1 und 2.The objects solve the technical problem with the features of claims 1 and 2.

Hierzu wird parallel zur Hydraulikpumpe ein Ventil angeordnet, das von einer dem Hydrospeicher zugeordneten Druckmesseinrichtung in Abhängigkeit vom erfassten Druck ansteuerbar ist. Dabei wird das Ventil geöffnet, wenn der Druck im Hydrospeicher einen ersten Grenzwert überschreitet und geschlossen, wenn der Druck einen zweiten Grenzwert unterschreitet. Hierdurch kann auf Überdruckventile verzichtet werden, wobei dann die Hydraulikpumpe bei offenem Ventil drucklos arbeitet und weniger elektrische Leistung aufnimmt. Durch entsprechende Wahl des zweiten Grenzwertes kann die Ansprechzeit entsprechend eingestellt werden.For this purpose, a valve is arranged parallel to the hydraulic pump a pressure measuring device assigned to the hydraulic accumulator in  Depending on the detected pressure can be controlled. The valve opened when the pressure in the hydraulic accumulator reaches a first limit exceeds and closes when the pressure exceeds a second limit below. As a result, pressure relief valves can be dispensed with, the hydraulic pump then works without pressure when the valve is open and consumes less electrical power. By appropriate choice of second limit, the response time can be set accordingly become.

Die Erfindung wird nachfolgend anhand eines bevorzugten Ausführungsbeispiels näher erläutert. Die einzige Figur zeigt ein schematisches Hydraulik-Schaltbild einer Druckversorgungseinrichtung für hydraulische Systeme in einem Kraftfahrzeug.The invention is based on a preferred Embodiment explained in more detail. The only figure shows one schematic hydraulic circuit diagram of a pressure supply device for hydraulic systems in a motor vehicle.

Die Druckversorgungseinrichtung 1 für hydraulische Systeme in einem Kraftfahrzeug umfasst einen Tank 2, eine kontinuierlich fördernde Hydraulikpumpe 3, ein Rückschlagventil 4, einen Hydrospeicher 5, einen hydraulischen Verbraucher 6, eine Druckmesseinrichtung 7 und ein parallel zur Hydraulikpumpe 3 angeordnetes Ventil 8. Die Druckmesseinrichtung 7 dient zur Erfassung des Speicherdrucks des Hydrospeichers 5 und steuert in Abhängigkeit vom erfassten Speicherdruck das Ventil 8 an.The pressure supply device 1 for hydraulic systems in a motor vehicle comprises a tank 2 , a continuously delivering hydraulic pump 3 , a check valve 4 , a hydraulic accumulator 5 , a hydraulic consumer 6 , a pressure measuring device 7 and a valve 8 arranged parallel to the hydraulic pump 3 . The pressure measuring device 7 serves to record the storage pressure of the hydraulic accumulator 5 and controls the valve 8 as a function of the recorded storage pressure.

Die Wirkunsweise der Druckverbindungseinrichtung 1 soll nun näher erläutert werden, wobei zunächst angenommen werden soll, dass das Ventil 8 geschlossen ist. In diesem Fall fördert die Hydraulikgruppe 3 kontinuierlich ein definiertes Ölvolumen, das durch das Rückschlagventil 4 zum hydraulischen Verbraucher 6 und von dort in den Tank 2 zurückfließt. Der Anteil des Ölvolumens, der nicht vom Verbraucher 6 umgesetzt wird, wird in dem Hydrospeicher 5 gespeichert und bei höherem Umsatz wieder freigesetzt. Erreicht hingegen der Hydrospeicher 5 seinen maximalen Speicherdruck, so steuert die Druckeinrichtung 7 das Ventil 8 an, so dass das Ventil 8 öffnet. Dadurch fördert die Hydraulikpumpe 3 das Ölvolumen direkt über das Ventil 8 in den Tank 2 zurück. In diesem Betriebsmodus arbeitet die Hydraulikgruppe 3 drucklos, so dass die aufgenommene elektrische Leistung reduziert ist. Setzt dann der hydraulische Verbraucher 6 wieder Öl um, so wird dieses Öl zunächst vom Hydrospeicher 5 geliefert. Fällt dann der Speicherdruck im Hydrospeicher 5 unter einen zweiten Grenzwert, so schließt die Druckmesseinrichtung 7 das Ventil 8 und die Hydraulikpumpe 3 arbeitet wieder gegen Druck. Im Extremfall kann der erste Grenzwert auf den maximalen und der zweite Grenzwert auf den minimalen Speicherdruck des Hydrospeichers 5 festgelegt werden. Ein bevorzugtes Anwendungsgebiet für die Druckversorgungseinrichtung 1 sind die hydraulischen Bremszylinder oder Lenkeinrichtungen in einem Kraftfahrzeug.The mode of operation of the pressure connection device 1 is now to be explained in more detail, it initially being assumed that the valve 8 is closed. In this case, the hydraulic group 3 continuously delivers a defined volume of oil which flows through the check valve 4 to the hydraulic consumer 6 and from there back into the tank 2 . The portion of the oil volume that is not converted by the consumer 6 is stored in the hydraulic accumulator 5 and released again at higher sales. If, on the other hand, the hydraulic accumulator 5 reaches its maximum accumulator pressure, the pressure device 7 controls the valve 8 so that the valve 8 opens. As a result, the hydraulic pump 3 delivers the oil volume back into the tank 2 directly via the valve 8 . In this operating mode, the hydraulic group 3 works without pressure, so that the electrical power consumed is reduced. If the hydraulic consumer 6 then converts oil again, this oil is initially supplied by the hydraulic accumulator 5 . If the storage pressure in the hydraulic accumulator 5 then falls below a second limit value, the pressure measuring device 7 closes the valve 8 and the hydraulic pump 3 works again against pressure. In extreme cases, the first limit value can be set to the maximum and the second limit value to the minimum accumulator pressure of the hydraulic accumulator 5 . A preferred application for the pressure supply device 1 are the hydraulic brake cylinders or steering devices in a motor vehicle.

Claims (2)

1. Druckversorgungseinrichtung für hydraulische Systeme in einem Kraftfahrzeug, umfassend einen Tank, eine kontinuierlich fördernde Hydraulikpumpe, ein Rückschlagventil, einen Hydrospeicher und einen hydraulischen Verbraucher, dadurch gekennzeichnet, dass parallel zur Hydraulikpumpe (3) ein Ventil (8) angeordnet ist, das von einer dem Hydrospeicher (5) zugeordneten Druckmesseinrichtung (7) in Abhängigkeit vom erfassten Druck ansteuerbar ist.1. Pressure supply device for hydraulic systems in a motor vehicle, comprising a tank, a continuously pumping hydraulic pump, a check valve, a hydraulic accumulator and a hydraulic consumer, characterized in that a valve ( 8 ) is arranged parallel to the hydraulic pump ( 3 ), which is by a The pressure measuring device ( 7 ) assigned to the hydraulic accumulator ( 5 ) can be controlled as a function of the detected pressure. 2. Verfahren zur Steuerung einer Druckversorgungseinrichtung für hydraulische Systeme in einem Kraftfahrzeug nach Anspruch 1, umfassend folgende Verfahrensschritte:
  • a) kontinuierliche Förderung eines definierten Ölvolumens durch die Hydraulikpumpe (3),
  • b) kontinuierliches Erfassen des Öldrucks im Hydrospeicher (5) und Öffnen des parallel zur Hydraulikpumpe (3) angeordneten Ventils (8) durch die Druckmesseinrichtung (7), falls der Druck im Hydrospeicher (5) einen ersten Grenzwert überschreitet oder Schließen des Ventils (8) durch die Druckmesseinrichtung (7), falls der Druck im Hydrospeicher (5) einen zweiten Grenzwert unterschreitet.
2. A method for controlling a pressure supply device for hydraulic systems in a motor vehicle according to claim 1, comprising the following method steps:
  • a) continuous delivery of a defined oil volume by the hydraulic pump ( 3 ),
  • b) continuous detection of the oil pressure in the hydraulic accumulator ( 5 ) and opening of the valve ( 8 ) arranged parallel to the hydraulic pump ( 3 ) by the pressure measuring device ( 7 ) if the pressure in the hydraulic accumulator ( 5 ) exceeds a first limit value or closing of the valve ( 8 ) by the pressure measuring device ( 7 ) if the pressure in the hydraulic accumulator ( 5 ) falls below a second limit value.
DE2000153586 2000-10-25 2000-10-25 Pressure generator for hydraulic systems in motor vehicles has hydraulic pump and parallel valve opened/closed by pressure measuring device, dependent upon pressure Withdrawn DE10053586A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE2000153586 DE10053586A1 (en) 2000-10-25 2000-10-25 Pressure generator for hydraulic systems in motor vehicles has hydraulic pump and parallel valve opened/closed by pressure measuring device, dependent upon pressure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2000153586 DE10053586A1 (en) 2000-10-25 2000-10-25 Pressure generator for hydraulic systems in motor vehicles has hydraulic pump and parallel valve opened/closed by pressure measuring device, dependent upon pressure

Publications (1)

Publication Number Publication Date
DE10053586A1 true DE10053586A1 (en) 2002-05-02

Family

ID=7661439

Family Applications (1)

Application Number Title Priority Date Filing Date
DE2000153586 Withdrawn DE10053586A1 (en) 2000-10-25 2000-10-25 Pressure generator for hydraulic systems in motor vehicles has hydraulic pump and parallel valve opened/closed by pressure measuring device, dependent upon pressure

Country Status (1)

Country Link
DE (1) DE10053586A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2867855A1 (en) * 2004-03-19 2005-09-23 Applic Procedes Electronique Pressure measurement device for pneumatic system, has programming units; two of which are jointly activated for adjusting parameterable functions, where combination of units to be activated is represented by color code
EP1628865A1 (en) * 2003-04-25 2006-03-01 Lucas Automotive GmbH Brake system for a motor vehicle
WO2015167386A1 (en) * 2014-04-30 2015-11-05 Voith Turbo Safeset Ab Pressure limiting device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528558A1 (en) * 1995-08-03 1997-02-06 Dieffenbacher Gmbh Maschf Procedure for operating hydraulic press - piston chamber of actuating unit connected to hydraulic accumulator so that volume of piston chamber during descending stroke of press slide is transferred to accumulator

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19528558A1 (en) * 1995-08-03 1997-02-06 Dieffenbacher Gmbh Maschf Procedure for operating hydraulic press - piston chamber of actuating unit connected to hydraulic accumulator so that volume of piston chamber during descending stroke of press slide is transferred to accumulator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1628865A1 (en) * 2003-04-25 2006-03-01 Lucas Automotive GmbH Brake system for a motor vehicle
JP2006528110A (en) * 2003-04-25 2006-12-14 ルーカス・オートモーティブ・ゲーエムベーハー Brake system for automobile
JP4781270B2 (en) * 2003-04-25 2011-09-28 ルーカス・オートモーティブ・ゲーエムベーハー Brake system for automobile
FR2867855A1 (en) * 2004-03-19 2005-09-23 Applic Procedes Electronique Pressure measurement device for pneumatic system, has programming units; two of which are jointly activated for adjusting parameterable functions, where combination of units to be activated is represented by color code
WO2015167386A1 (en) * 2014-04-30 2015-11-05 Voith Turbo Safeset Ab Pressure limiting device

Similar Documents

Publication Publication Date Title
DE10064201B4 (en) Brake pressure control device with a device for the diagnosis of manually operated hydraulic systems
DE112008002061B4 (en) Pump controller and brake control system
DE112008002155B4 (en) Brake control system and brake control method
DE2908482C2 (en) Device for hydraulic brake systems with blocking device
WO2013131891A1 (en) Method for calibrating analog-controlled hydraulic valves and brake system comprising an electronic control and regulating unit in which the method is carried out
WO1999052756A1 (en) Device for regulating brake pressure
DE102015223508A1 (en) Pump unit for a hydraulic vehicle brake system
DE2163643A1 (en) Device for charging a pressure accumulator
DE112014002128T5 (en) Hydraulic brake system, bleeding device and bleeding method
DE19729097B4 (en) Method and device for controlling a brake system
EP0925434A1 (en) System for operating an internal combustion engine, in particular of a motor vehicle
DE19905660A1 (en) Electronically regulated brake actuating system for motor vehicles has pressure source with proportional regulating valve that enables pressure produced by pump to be adjusted
DE2460309A1 (en) ANTI-SKID CONTROL SYSTEM FOR PRESSURE-ACTUATED VEHICLE BRAKES
DE102004020937A1 (en) Method for determining a closing time of a closing element and circuit arrangement
DE2906897C2 (en)
DE3408872C2 (en)
DE102014220742B4 (en) Method for operating a fuel supply system for an internal combustion engine
DE3013853C2 (en)
EP0749887B1 (en) Fluid-driven control apparatus for a power steering and a clutch as well as method for its operation
DE10053586A1 (en) Pressure generator for hydraulic systems in motor vehicles has hydraulic pump and parallel valve opened/closed by pressure measuring device, dependent upon pressure
DE102005023410B4 (en) Method for detecting gas trapped in the hydraulic fluid of a hydraulic circuit
DE69929390T2 (en) Control unit for a vehicle brake system with monitoring of the battery
EP1527974B1 (en) Air treatment system and method of supplying a brake system of a commercial motor vehicle with compressed air
DE2405105C3 (en) Method and device for shutting off pressure accumulators
DE10207803B4 (en) Pressure regulator of a compressed air supply device for a brake system of a motor vehicle and method for filling a motor vehicle brake system with compressed air

Legal Events

Date Code Title Description
OM8 Search report available as to paragraph 43 lit. 1 sentence 1 patent law
8141 Disposal/no request for examination