EP1530531A1 - Method for bleeding and refilling an electrohydraulic brake system - Google Patents
Method for bleeding and refilling an electrohydraulic brake systemInfo
- Publication number
- EP1530531A1 EP1530531A1 EP03787766A EP03787766A EP1530531A1 EP 1530531 A1 EP1530531 A1 EP 1530531A1 EP 03787766 A EP03787766 A EP 03787766A EP 03787766 A EP03787766 A EP 03787766A EP 1530531 A1 EP1530531 A1 EP 1530531A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wheel
- pressure medium
- pump
- brake
- pressure
- 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- Withdrawn
Links
- 230000000740 bleeding effect Effects 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims description 24
- 238000009423 ventilation Methods 0.000 claims description 15
- 238000013022 venting Methods 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 2
- 230000010349 pulsation Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000004088 simulation Methods 0.000 description 2
- 238000005276 aerator Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- 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
- B60T8/4081—Systems with stroke simulating devices for driver input
-
- 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
- B60T11/00—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant
- B60T11/10—Transmitting braking action from initiating means to ultimate brake actuator without power assistance or drive or where such assistance or drive is irrelevant transmitting by fluid means, e.g. hydraulic
- B60T11/28—Valves specially adapted therefor
- B60T11/30—Bleed valves for hydraulic brake systems
-
- 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
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
- B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
- B60T17/222—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems by filling or bleeding of hydraulic systems
-
- 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
Definitions
- the invention relates to a method for bleeding and refilling an electrohydraulic brake system, consisting of a pedal-operated master brake cylinder and a brake circuit regulated by the master cylinder pressure with a pump, the suction side of which is connected to a pressure medium reservoir via a suction line, and a high-pressure accumulator, and inlet and outlet valves for the wheel brakes connected to the brake circuit, where an inlet valve controls the connection of the associated wheel brake to the high-pressure accumulator and an outlet valve controls the connection of the associated wheel brake to the pressure medium reservoir via an unpressurized return line, and the master brake cylinder is connected to the brake circuit via a separating valve downstream of the inlet valves.
- a ventilation system for an ABS brake system in which a pump operation is provided for venting the return line. Since this ABS system is a closed system in which the pump for lowering the wheel brake pressure directly delivers pressure medium from the wheel brakes to the master brake cylinder (recirculation), the problem of air inclusion in the suction line does not arise here.
- the invention is therefore based on the problem of representing a method for a pressure medium reservoir for an electrohydraulic brake system in which an open return system is provided, that is to say the pumps are conveying from an unpressurized pressure medium reservoir, which enables all areas of the brake system, but in particular the intake area of the pump.
- the invention provides that the following method steps are initiated.
- the first-mentioned alternative of process step 4 serves to vent further areas of the brake system.
- the pump In order to bleed the other areas of the brake system, the pump is switched on and the valves of the system are controlled so that fresh pressure medium is pumped into these areas by the pump.
- the pump can also be controlled in a clocked manner in order to generate pressure pulsations with which air bubbles are released in the line system. The same effect is achieved if the exhaust valves are actuated in a clocked manner.
- the ventilation is carried out in the following order: 1. First a conventional ventilation in the direction of the wheel bleeder connections.
- a pump vent also in the direction of the wheel vent connection.
- This last bleeding step can also be used to check whether the brake lines have been connected correctly.
- the ventilation is carried out for one wheel brake, d. H. with the wheel bleeder connection open while the other wheel brakes are closed.
- a corresponding pressure build-up in the wheel brakes can be determined by opening the respective inlet valves.
- 1 shows the hydraulic circuit diagram of a hydraulic brake system
- 2 is a diagram showing a first sequence of the method according to the invention
- FIG. 3 shows a diagram to illustrate a second sequence of the method according to the invention
- Fig. 5 is a diagram showing a fourth
- Fig. 6 is a diagram showing a fifth sequence of the method according to the invention.
- FIG. 1 shows a typical electro-hydraulic brake system, which is constructed as follows:
- a master brake cylinder 1 in tandem form has two brake circuits, namely a primary circuit (also called push rod circuit DK) and a secondary circuit SK, the primary brake circuit 2 shown being connected to a pedal simulator 3.
- a pressure medium reservoir 4 is connected to the master cylinder 1.
- the wheel brakes 7 of the rear axle are each connected to this pressure medium supply system via an inlet valve 8.
- each via an outlet valve 9 and a return line 18 a connection to the pressure medium reservoir 4 can be established.
- the inlet and outlet valves 8, 9 are normally closed.
- a pressure build-up in the wheel brakes 7 takes place by opening the respective inlet valve 8, a pressure reduction by opening the respective outlet valve 9.
- a controlled brake circuit 2 ' is formed, the pressure made available to the wheel brakes 7 being determined by the master cylinder pressure, which is at controlled braking is hydraulically separated from the wheel brakes 7.
- there is a line valve 2a which flows downstream of the inlet valve 8 into the lines 2b leading to the wheel brakes 7, a separating valve 10, which is closed in the control mode and only remains open when the regulated brake circuit 2 ', e.g. B. because of a failure of the pressure medium supply.
- the system is u. a. monitored and controlled by various pressure sensors.
- Brake pressure sensors 11 are assigned to the individual wheel brakes 7, a pump pressure sensor 12 to the pressure medium supply system and a simulation pressure sensor 13 to the master brake cylinder per brake circuit.
- the isolating valve is closed in the case of electrohydraulic braking.
- the pressure in the master brake cylinder serves as a control variable.
- the pressure of the master brake cylinder 1 is measured with the simulation pressure sensor 13 and given as a control variable to the control of the regulated brake circuit 2 '. If the pressure supply system fails, the isolating valve 10 remains open.
- the wheel brakes 7 are thus connected in a conventional manner directly to the master brake cylinder 1 via lines 2a and 2b.
- a compensating valve 14 ensures pressure equalization between the wheel brakes of an axle.
- the brake system must be serviced regularly, in particular the brake fluid must be changed. This can lead to errors. For example, connections can be interchanged or the brake system cannot be properly vented, which leads to air pockets. The following procedure is therefore proposed for checking the braking system:
- the wheel brakes 7, which is only indicated schematically, are provided with valve-controlled wheel bleeder connections 20, if necessary, via which pressure medium can be removed from the brake circuits.
- a so-called bleeding device is connected to the filler neck 21 of the pressure medium reservoir 4, which provides fresh brake fluid and is able to build up a pressure of approx. 2 bar in order to accelerate the bleeding process.
- the individual sequences for performing the bleeding and refilling the hydraulic brake system are shown in the form of diagrams which are shown in FIGS. 2-6.
- the time is plotted on the horizontal axis and the switching states for the individual components of the braking system on the vertical axis.
- the curves in the diagram show the switching status of the individual components. The following components are considered from top to bottom:
- VL stands for front left, front right, rear left and rear right for the intake and exhaust valves EV and AV.
- the brake system is in the basic state. During the entire bleeding procedure, the bleeding device is connected so that a bleeding pressure is applied to the brake system (state 1).
- the wheel bleeder connections VR, HR, VL and VR are opened in succession for approx. 30 seconds each (markings 101, 102, 103, 104), with a bleeder pressure (mark 105) being constantly applied.
- the conventional brake circuit consisting of the master brake cylinder 1, the isolating valve 2, the brake lines 2a, 2b and the wheel brakes 7, is flowed through by pressure medium and thus vented.
- the regulated brake circuit 2 'remains unaffected, since both the intake valves 8 and the exhaust valves 9 remain closed. This process corresponds to a conventional bleeding, i.e. the bleeding of a conventional, non-regulated brake system.
- the switching state of the compensating valve AV 14 in the pressure rod circuit and secondary circuit is also indicated.
- the states are 0: open and 1: closed.
- the second switching sequence begins with a memory drain SE, in which the isolating valves 10 (marking 201) and the compensating valves 14 (marking 202) are closed.
- a partial sequence 2.1 all inlet valves 8 are opened, all outlet valves 9 are closed, and the separating valves 10 of the two brake circuits are closed, the compensating valves 14 being able to remain open. Furthermore, the wheel vent connection at the front left remains open or the wheel vent connection 20, on which the vent bottle is located, so that the pumps 5 pump from the pressure medium reservoir 4 into this wheel vent connection 20 (marking 205, 206). In particular, the suction line 17 is flushed and thus vented. If necessary, switching breaks must be provided for the pumps 5. To end this partial sequence 2.1, the inlet valves 8 are closed again, it being important to ensure that the pumps 5 stop operating shortly beforehand in order to avoid pressure peaks. The partial sequence 2.1 can be repeated up to 5 times.
- the following partial sequence 2.2 initially provides for a storage discharge SE and a subsequent defined storage filling SF, in which the inlet valves 8 are closed while the pump 5 is delivering (marking 207).
- the inlet valve at the front left is then opened and closed 40 times in short cycles of less than 0.1 seconds (marking 208), so that the reservoir 6 is emptied in a pulsed manner and the pressure medium can flow off via the vent connection 20 at the front left.
- the pulsing load on the system releases adhering bubbles, particularly in the valve block.
- process step 4 the return line 18 is also flushed.
- the outlet valves 9 (markings 401 to 404) are switched in succession in each case, so that pressure pulsations are again generated and the return line 18 is flushed intermittently. This should also cause that Release air bubbles. Switching sequence 4 can be carried out twice.
- the wheel bleeder connections 20 are opened one after the other in sub-sequences 5.1, 5.2, 5.3 and 5.4 (markings 501 to 504), whereby, before the inlet valve 8 of the wheel brake is opened with the wheel bleeder connection 20 opened ( Marking 505), first the other three intake valves (triple) are opened (marking 506) so that a pressure builds up in the closed wheel brakes, which is then restored to approx. 2 bar shortly afterwards by opening the associated exhaust valves 9 (marking 507).
- the pressure in the wheel brakes can be monitored. This must correspond to the respective switching states. Since in this way a pressure is built up and reduced again in succession in wheel brakes, each of which is composed of triples, it can be determined whether lines have possibly been interchanged.
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention is based on the problem in that, particularly in electrohydraulic brake systems, areas exist inside the line systems that are not reached during a conventional bleeding. This occurs, in particular, when the suction line is detached from the system pump during repair work carried out on the system. For this reason, the invention provides a pump-driven bleeding during which, among other things, pressure medium is, when outlet valves (9) are open, returned by the pump to the reservoir (4) from the pressure medium storage tank via the outlet valves (9). The pump (5) or the outlet valves can be controlled in a clocked manner in order to produce pressure pulsations that effect a removal of clinging air bubbles.
Description
Verfahren zum Entlüften und Neubefüllen eines ele trohy- draulischen BremssystemsProcess for bleeding and refilling an electro-hydraulic brake system
Die Erfindung bezieht sich auf ein Verfahren zum Entlüften und Neubefüllen eines elektrohydraulischen Bremssystems, bestehend aus einem pedalbetätigten Hauptbremszylinder und einem vom Hauptbremszylinderdruck geregelten Bremskreis mit einer Pumpe, deren Saugseite über eine Saugleitung an einen Druckmittelvorratsbehalter angeschlossen ist, und einem Hochdruckspeicher, sowie Ein- und Auslassventilen für die an den Bremskreis angeschlossenen Radbremsen, wobei ein Einlassventil die Verbindung der zugehRrigen Radbremse zum Hochdruckspeicher und ein Auslassventil die Verbindung der zugehRrigen Radbremse zum Druckmittelvorratsbehalter über eine drucklose Rücklaufleitung steuert, und wobei der Hauptbremszylinder über ein Trennventil stromabwärts der Einlassventile an den Bremskreis angeschlossen ist.The invention relates to a method for bleeding and refilling an electrohydraulic brake system, consisting of a pedal-operated master brake cylinder and a brake circuit regulated by the master cylinder pressure with a pump, the suction side of which is connected to a pressure medium reservoir via a suction line, and a high-pressure accumulator, and inlet and outlet valves for the wheel brakes connected to the brake circuit, where an inlet valve controls the connection of the associated wheel brake to the high-pressure accumulator and an outlet valve controls the connection of the associated wheel brake to the pressure medium reservoir via an unpressurized return line, and the master brake cylinder is connected to the brake circuit via a separating valve downstream of the inlet valves.
Bei einer derartigen hydraulischen Bremsanlage, bei der Teile des Leitungssystems durch Ventile geschlossen sind, reicht eine konventionell durchgeführte Entlüftung nicht aus, um alle Bereiche des Bremssystems luft- und gasbla- senfrei zu erhalten, da eine solche Entlüftung nur die Bremsleitung zwischen dem Hauptbremszylinder und der jeweiligen Radbremse erfasst. Insbesondere für den Fall, dass die Saugleitung der Pumpe zum Druckmittelvorratsbehalter aus Reparaturgründen gelRst werden muss, kann Luft in die Pumpe gelangen, die weder von alleine zum Druck-
mittelvorratsbehälter aufsteigt, noch durch eine konventionell durchgeführte Entlüftung entfernt werden kann. Da diese Luft unter Umständen in den Bremskreis gelangen kann, muss sie vor Inbetriebnahme des Fahrzeuges entfernt werden.In such a hydraulic brake system, in which parts of the line system are closed by valves, a conventionally carried out ventilation is not sufficient to keep all areas of the brake system free of air and gas bubbles, since such a ventilation only the brake line between the master brake cylinder and the respective wheel brake detected. In particular, in the event that the suction line of the pump to the pressure medium reservoir has to be loosened for repair reasons, air can get into the pump, which neither medium storage container rises, can still be removed by a conventional ventilation. Since this air can possibly get into the brake circuit, it must be removed before the vehicle is started up.
Aus der DE 38 06 840 C2 ist ein Entlüftungssystem für eine ABS-Bremsanlage bekannt, bei der zum Entlüften der Rückführleitung ein Pumpenbetrieb vorgesehen ist. Da es sich bei dieser ABS-Anlage um ein geschlossenes System handelt, bei der die Pumpe zur Radbremsdruckabsenkung unmittelbar Druckmittel von den Radbremsen in den Hauptbremszylinder fRrdert (RückfRrderung) , tritt hier das Problem des Lufteinschlusses in der Saugleitung nicht auf.From DE 38 06 840 C2, a ventilation system for an ABS brake system is known, in which a pump operation is provided for venting the return line. Since this ABS system is a closed system in which the pump for lowering the wheel brake pressure directly delivers pressure medium from the wheel brakes to the master brake cylinder (recirculation), the problem of air inclusion in the suction line does not arise here.
Die Erfindung beruht somit auf dem Problem, zu einem Druckmittelvorratsbehalter für eine elektrohydraulische Bremsanlage, bei der ein offenes Rückführsystem vorgesehen ist, also die Pumpen aus einem drucklosen Druckmittelvorratsbehalter fRrdern, ein Verfahren darzustellen, das es ermRglicht, alle Bereiche des Bremssystems, insbesondere aber den Ansaugbereich der Pumpe, zu entlüften.The invention is therefore based on the problem of representing a method for a pressure medium reservoir for an electrohydraulic brake system in which an open return system is provided, that is to say the pumps are conveying from an unpressurized pressure medium reservoir, which enables all areas of the brake system, but in particular the intake area of the pump.
Zur LRsung des Problems sieht die Erfindung vor, dass die folgenden Verfahrensschritte eingeleitet werden.To solve the problem, the invention provides that the following method steps are initiated.
1. Anschließen einer Entlüfterflasche an die Radentlüfteranschlüsse an den Radbremsen.1.Connect a bleed bottle to the wheel bleed connections on the wheel brakes.
2. Anschließen eines Entlüftergerätes an einem Füllstutzen des Druckmittelvorratsbehälters .2. Connect a breather device to a filler neck of the pressure medium reservoir.
3. Einschalten der Pumpe und FRrdern von Druckmittel aus dem Vorratsbehälter.
4. Schalten der Ein- und Auslassventile und der Trennventile derart, dass Druckmittel aus dem Hochdruckspeicher entweder zu den Radentlüfteranschlüssen oder in den Druckmittelvorratsbehalter gelangt .3. Switch on the pump and convey pressure medium from the reservoir. 4. Switching the inlet and outlet valves and the separating valves in such a way that pressure medium from the high-pressure accumulator either reaches the wheel bleeder connections or the pressure medium reservoir.
Insbesondere mit der letzten Alternative des Prozessschrittes 4 wird eine Entlüftung des Ansaugbereiches bewirkt .With the last alternative of process step 4 in particular, the suction area is vented.
Die zuerst genannte Alternative des Prozessschrittes 4 dient der Entlüftung weiterer Bereiche des Bremssystems.The first-mentioned alternative of process step 4 serves to vent further areas of the brake system.
Da große Teile des Leitungssystems einem konventionellen Bremssystem entsprechen (nämlich die Bremsleitungen, die von dem Hauptbremszylinder über die Trennventile zu den Radbremsen führen) , kann deren Entlüftung in konventioneller Weise erfolgen, d. h. Druckmittel wird von einem Belüftergerät am Druckmittelvorratsbehalter vom Hauptbremszylinder über die Bremsleitungen zu den Radbremsen gepumpt, wo es an entsprechenden Radentlüfteranschlüssen abgelassen wird. Eine solche konventionelle Entlüftung kann dem Prozess nach Anspruch 1 vorgeschaltet werden.Since large parts of the line system correspond to a conventional brake system (namely the brake lines which lead from the master brake cylinder via the isolating valves to the wheel brakes), they can be vented in a conventional manner, i. H. Pressure fluid is pumped by an aerator on the pressure fluid reservoir from the master brake cylinder via the brake lines to the wheel brakes, where it is drained off at the corresponding wheel bleeder connections. Such a conventional ventilation can be connected upstream of the process according to claim 1.
Um die weiteren Bereiche des Bremssystems zu entlüften, wird die Pumpe eingeschaltet und die Ventile des Systems so angesteuert, dass frisches Druckmittel von der Pumpe in diese Bereiche gefRrdert wird. Dabei kann die Pumpe auch getaktet angesteuert werden, um Druckpulsationen zu erzeugen, mit denen Luftblasen im Leitungssystem gelRst werden. Der gleiche Effekt wird erreicht, wenn die Auslassventile getaktet angesteuert werden.In order to bleed the other areas of the brake system, the pump is switched on and the valves of the system are controlled so that fresh pressure medium is pumped into these areas by the pump. The pump can also be controlled in a clocked manner in order to generate pressure pulsations with which air bubbles are released in the line system. The same effect is achieved if the exhaust valves are actuated in a clocked manner.
Um eine komplette Entlüftung zu erreichen, wird die Entlüftung in der folgenden Reihenfolge vorgenommen:
1. Zunächst eine konventionelle Entlüftung in Richtung der Radentlüfteranschlüsse.To achieve complete ventilation, the ventilation is carried out in the following order: 1. First a conventional ventilation in the direction of the wheel bleeder connections.
2. Eine Pumpenentlüftung ebenfalls in Richtung Radentlüfteranschluss .2. A pump vent also in the direction of the wheel vent connection.
3. Anschließendes Laden des Speichers und Entlüftung in Richtung der Radentlüfteranschlüsse.3. Then load the accumulator and vent it in the direction of the wheel vent connections.
4. Erneutes Laden des Speichers und Entlüften in Richtung des Druckmittelvorratsbehälters.4. Reload the accumulator and vent in the direction of the pressure medium reservoir.
5. Abschließend nochmals eine Pumpenentlüftung in Richtung Radentlüfteranschlüsse.5. Finally, another pump vent in the direction of the wheel vent connections.
Bei diesem letzten Entlüftungsschritt kann auch kontrolliert werden, ob die Bremsleitungen richtig angeschlossen worden sind. Dazu erfolgt die Entlüftung jeweils für eine Radbremse, d. h. bei geRffnetem Radentlüfteranschluss, während die der anderen Radbremsen geschlossen sind. Durch Öffnen der jeweiligen Einlassventile lässt sich ein entsprechender Druckaufbau in den Radbremsen feststellen. Dadurch, dass nach und nach alle vier Radbremsen in Tri- plets zusammengefasst werden, lässt sich ermitteln, welche Leitungen gegebenenfalls vertauscht worden sind, da ein Druckaufbau in jedem Teilschritt nur in den Radbremsen festgestellt werden darf, deren Einlassventile geRffnet worden sind. Sollten sich hier Abweichungen ergeben, stimmt z. B. die Zuordnung der Einlassventile zu den Radbremsen nicht mehr.This last bleeding step can also be used to check whether the brake lines have been connected correctly. For this purpose, the ventilation is carried out for one wheel brake, d. H. with the wheel bleeder connection open while the other wheel brakes are closed. A corresponding pressure build-up in the wheel brakes can be determined by opening the respective inlet valves. By gradually combining all four wheel brakes in triplets, it is possible to determine which lines may have been interchanged, since pressure build-up in each sub-step may only be determined in the wheel brakes whose inlet valves have been opened. If there are deviations here, z. B. the assignment of the intake valves to the wheel brakes no longer.
Im Folgenden soll anhand eines Ausführungsbeispieles die Erfindung näher erläutert werden. Dazu zeigen:The invention is to be explained in more detail below on the basis of an exemplary embodiment. To show:
Fig. 1 den hydraulischen Schaltplan einer hydraulischen Bremsanlage,
Fig. 2 ein Diagramm zur Darstellung einer ersten Sequenz des erfindungsgemäßen Verfahrens,1 shows the hydraulic circuit diagram of a hydraulic brake system, 2 is a diagram showing a first sequence of the method according to the invention,
Fig. 3 ein Diagramm zur Darstellung einer zweiten Sequenz des erfindungsgemäßen Verfahrens,3 shows a diagram to illustrate a second sequence of the method according to the invention,
Fig. 4 ein Diagramm zur Darstellung einer dritten Sequenz des erfindungsgemäßen Verfahrens,4 shows a diagram to illustrate a third sequence of the method according to the invention,
Fig. 5 ein Diagramm zur Darstellung einer viertenFig. 5 is a diagram showing a fourth
Sequenz des erfindungsgemäßen Verfahrens undSequence of the method according to the invention and
Fig. 6 ein Diagramm zur Darstellung einer fünften Sequenz des erfindungsgemäßen Verfahrens .Fig. 6 is a diagram showing a fifth sequence of the method according to the invention.
Es wird zunächst auf die Fig. 1 Bezug genommen. Diese zeigt eine typische elektrohydraulische Bremsanlage, die wie folgt aufgebaut ist:Reference is first made to FIG. 1. This shows a typical electro-hydraulic brake system, which is constructed as follows:
Ein Hauptbremszylinder 1 in Tandemform besitzt zwei Bremskreise, nämlich einen Primärkreis (auch Druckstangenkreis DK genannt) und einen Sekundärkreis SK, wobei der dargestellte primäre Bremskreis 2 mit einem Pedalsimulator 3 verbunden ist. Außerdem ist ein Druckmittelvorratsbehalter 4 an dem Hauptbremszylinder 1 angeschlossen. Motorisch angetriebene Pumpen 5 und ein Hochdruckspeicher, z. B. ein Metallfaltenbalgspeicher 6, bilden ein Druckversorgungssystem, das aus dem Druckmittelvorratsbehalter 4 mit einem Druckmittel (Bremsflüssigkeit) versorgt wird, wozu die Pumpe 5 über eine Saugleitung 17 mit dem Druckmittelvorratsbehalter 4 verbunden ist. Die Radbremsen 7 der Hinterachse sind über je ein Einlassventil 8 an dieses Druckmittelversorgungssystem angeschlossen. Außerdem kann über je ein Auslassventil 9 und eine Rücklaufleitung
18 eine Verbindung zum Druckmittelvorratsbehalter 4 hergestellt werden. Die Einlass- und die Auslassventile 8, 9 sind normalerweise geschlossen. Ein Druckaufbau in den Radbremsen 7 erfolgt durch Öffnen des jeweiligen Einlassventils 8, eine Druckabsenkung durch Öffnen des jeweiligen Auslassventils 9. Auf diese Weise ist ein geregelter Bremskreis 2' gebildet, wobei der den Radbremsen 7 zur Verfügung gestellte Druck vom Hauptbremszylinderdruck bestimmt ist, der bei einer geregelten Bremsung hydraulisch von den Radbremsen 7 getrennt ist. Dazu befindet sich in der Leitung 2a, die stromabwärts des Einlassventils 8 in die zu den Radbremsen 7 führenden Leitungen 2b mündet, ein Trennventil 10, das im Regelmodus geschlossen wird und nur dann offen bleibt, wenn eine StRrung des geregelten Bremskreises 2', z. B. wegen eines Ausfalles der Druckmittelversorgung, vorliegt.A master brake cylinder 1 in tandem form has two brake circuits, namely a primary circuit (also called push rod circuit DK) and a secondary circuit SK, the primary brake circuit 2 shown being connected to a pedal simulator 3. In addition, a pressure medium reservoir 4 is connected to the master cylinder 1. Motor-driven pumps 5 and a high-pressure accumulator, e.g. B. a metal bellows accumulator 6, form a pressure supply system that is supplied from the pressure medium reservoir 4 with a pressure medium (brake fluid), for which purpose the pump 5 is connected via a suction line 17 to the pressure medium reservoir 4. The wheel brakes 7 of the rear axle are each connected to this pressure medium supply system via an inlet valve 8. In addition, each via an outlet valve 9 and a return line 18 a connection to the pressure medium reservoir 4 can be established. The inlet and outlet valves 8, 9 are normally closed. A pressure build-up in the wheel brakes 7 takes place by opening the respective inlet valve 8, a pressure reduction by opening the respective outlet valve 9. In this way, a controlled brake circuit 2 'is formed, the pressure made available to the wheel brakes 7 being determined by the master cylinder pressure, which is at controlled braking is hydraulically separated from the wheel brakes 7. For this purpose, there is a line valve 2a, which flows downstream of the inlet valve 8 into the lines 2b leading to the wheel brakes 7, a separating valve 10, which is closed in the control mode and only remains open when the regulated brake circuit 2 ', e.g. B. because of a failure of the pressure medium supply.
Das System wird u. a. durch diverse Drucksensoren überwacht und gesteuert. Den einzelnen Radbremsen 7 sind Bremsdrucksensoren 11 zugeordnet, dem Druckmittelversorgungssystem ein Pumpendrucksensor 12 und dem Hauptbremszylinder je Bremskreis ein Simulationsdrucksensor 13. Bei einer elektrohydraulischen Bremsung ist das Trennventil geschlossen. Der Druck im Hauptbremszylinder dient als SteuergrRße. Dazu wird der Druck des Hauptbremszylinders 1 mit dem Simulationsdrucksensor 13 gemessen und als SteuergrRße an die Steuerung des geregelten Bremskreises 2 ' gegeben. Bei Ausfall des Druckversorgungssystems bleibt das Trennventil 10 geRffnet. Die Radbremsen 7 sind somit in konventioneller Weise unmittelbar über Leitungen 2a und 2b mit dem Hauptbremszylinder 1 verbunden. Ein Ausgleichsventil 14 sorgt dabei für einen Druckausgleich zwischen den Radbremsen einer Achse.The system is u. a. monitored and controlled by various pressure sensors. Brake pressure sensors 11 are assigned to the individual wheel brakes 7, a pump pressure sensor 12 to the pressure medium supply system and a simulation pressure sensor 13 to the master brake cylinder per brake circuit. The isolating valve is closed in the case of electrohydraulic braking. The pressure in the master brake cylinder serves as a control variable. For this purpose, the pressure of the master brake cylinder 1 is measured with the simulation pressure sensor 13 and given as a control variable to the control of the regulated brake circuit 2 '. If the pressure supply system fails, the isolating valve 10 remains open. The wheel brakes 7 are thus connected in a conventional manner directly to the master brake cylinder 1 via lines 2a and 2b. A compensating valve 14 ensures pressure equalization between the wheel brakes of an axle.
Die Bremsanlage muss regelmäßig gewartet werden, insbesondere muss die Bremsflüssigkeit gewechselt werden.
Hierbei kann es zu Fehlern kommen. Z. B. kRnnen Anschlüsse vertauscht werden oder aber das Bremssystem nicht richtig entlüftet werden, was zu Lufteinschlüssen führt. Zur Kontrolle des Bremssystems wird daher das folgende Verfahren vorgeschlagen:The brake system must be serviced regularly, in particular the brake fluid must be changed. This can lead to errors. For example, connections can be interchanged or the brake system cannot be properly vented, which leads to air pockets. The following procedure is therefore proposed for checking the braking system:
Die Radbremsen 7 sind, was nur schematisch angedeutet ist, mit ggf. ventilgesteuerten Radentlüfteranschlüssen 20 versehen, über die den Bremskreisen Druckmittel entnommen werden kann.The wheel brakes 7, which is only indicated schematically, are provided with valve-controlled wheel bleeder connections 20, if necessary, via which pressure medium can be removed from the brake circuits.
Zum Entlüften und Neubefüllen des Systems werden an diese Radentlüfteranschlüsse 20 Entlüfterflaschen angeschlossen, in denen das aus den Bremskreisen abgelassene Druckmittel fließt.To bleed and refill the system, 20 bleeding bottles are connected to these wheel bleeding connections, in which the pressure medium drained from the brake circuits flows.
Des Weiteren wird an den Füllstutzen 21 des Druckmittelvorratsbehälters 4 ein sogenanntes Entlüftergerät angeschlossen, das frische Bremsflüssigkeit zur Verfügung stellt und in der Lage ist, einen Druck von ca. 2 bar aufzubauen, um den Entlüftervorgang zu beschleunigen.Furthermore, a so-called bleeding device is connected to the filler neck 21 of the pressure medium reservoir 4, which provides fresh brake fluid and is able to build up a pressure of approx. 2 bar in order to accelerate the bleeding process.
Die einzelnen Sequenzen zur Durchführung der Entlüftung und der Neubefüllung des hydraulischen Bremssystems sind in Form von Diagrammen dargestellt, die in den Figuren 2 - 6 dargestellt sind. Auf der horizontalen Achse ist jeweils die Zeit abgetragen, auf der vertikalen Achse die Schaltzustände für die einzelnen Komponenten des Bremssystems. Die Kurven im Diagramm zeigen an, in welchem Schaltzustand sich die einzelne Komponente befindet. Von oben nach unten werden die folgenden Komponenten berücksichtigt :The individual sequences for performing the bleeding and refilling the hydraulic brake system are shown in the form of diagrams which are shown in FIGS. 2-6. The time is plotted on the horizontal axis and the switching states for the individual components of the braking system on the vertical axis. The curves in the diagram show the switching status of the individual components. The following components are considered from top to bottom:
Pumpe :Pump:
Mit den Schaltzuständen: 0: ausgeschaltet, 1: pumpend.
Einlassventile EV:With the switching states: 0: switched off, 1: pumping. Inlet valves EV:
Mit den Schaltzuständen: 0: geschlossen, 1: geRffnet.With the switching states: 0: closed, 1: open.
Auslassventile AV:Exhaust valves AV:
Mit den Schaltzuständen: 0: geschlossen, 1: geRffnet.With the switching states: 0: closed, 1: open.
Bei den Ein- und Auslassventilen EV und AV stehen die Abkürzungen VL, VR, HL, HR für vorne links, vorne rechts, hinten links und hinten rechts.The abbreviations VL, VR, HL, HR stand for front left, front right, rear left and rear right for the intake and exhaust valves EV and AV.
Trennventil TV:Isolation valve TV:
Für den Druckstangenkreis DK und den Sekundärkreis SK in den Schaltzuständen: 0: geRffnet, 1: geschlossen.For the push rod circuit DK and the secondary circuit SK in the switching states: 0: open, 1: closed.
Radentlüfteranschlüsse ENTL:Wheel bleeder connections ENTL:
Mit den Schaltzuständen: 0: geschlossen, 1: geRffnetWith the switching states: 0: closed, 1: open
Entlüftergerät ENTL Druck:Breather device ENTL pressure:
Mit den Schaltzuständen 0: drucklos, 1: eingeschaltet mit einer Druckbeaufschlagung des Druckmittelvorratsbehälters 4 (Entlüfterdruck) .With the switching states 0: depressurized, 1: switched on when the pressure medium reservoir 4 is pressurized (venting pressure).
Befinden sich alle Ventile und die Pumpe im Zustand 0, so befindet sich das Bremssystem im Grundzustand. Während der gesamten Entlüfterprozedur ist das Entlüftergerät angeschlossen, so dass ein Entlüfterdruck am Bremssystem anliegt (Zustand 1) .If all valves and the pump are in state 0, the brake system is in the basic state. During the entire bleeding procedure, the bleeding device is connected so that a bleeding pressure is applied to the brake system (state 1).
In der in Figur 2 dargestellten ersten Schaltsequenz lässt sich leicht erkennen, dass die Radentlüfteranschlüsse VR, HR, VL und VR nacheinander für jeweils ca. 30 Sekunden geRffnet werden (Markierungen 101,102,103, 104), wobei dauernd ein Entlüfterdruck (Markierung 105) anliegt. Dabei wird der konventionelle Bremskreis, bestehend aus dem Hauptbremszylinder 1, dem Trennventil 2, den Bremsleitungen 2a, 2b und den Radbremsen 7, von Druckmittel durchstrRmt
und damit entlüftet. Der geregelte Bremskreis 2' bleibt davon unberührt, da sowohl die Einlassventile 8 als auch die Auslassventile 9 geschlossen bleiben. Dieser Vorgang entspricht einer konventionellen Entlüftung, also der Entlüftung eines konventionellen nicht geregelten Bremssystems .In the first switching sequence shown in FIG. 2, it can easily be seen that the wheel bleeder connections VR, HR, VL and VR are opened in succession for approx. 30 seconds each (markings 101, 102, 103, 104), with a bleeder pressure (mark 105) being constantly applied. The conventional brake circuit, consisting of the master brake cylinder 1, the isolating valve 2, the brake lines 2a, 2b and the wheel brakes 7, is flowed through by pressure medium and thus vented. The regulated brake circuit 2 'remains unaffected, since both the intake valves 8 and the exhaust valves 9 remain closed. This process corresponds to a conventional bleeding, i.e. the bleeding of a conventional, non-regulated brake system.
In den folgenden Diagrammen der Fig. 3 ist zusätzlich der Schaltzustand des Ausgleichsventils AV 14 im Druckstangenkreis und Sekundärkreis angegeben. Die Zustände sind 0: geRffnet und 1: geschlossen.In the following diagrams of FIG. 3, the switching state of the compensating valve AV 14 in the pressure rod circuit and secondary circuit is also indicated. The states are 0: open and 1: closed.
Die zweite Schaltsequenz beginnt mit einer Speicherentleerung SE, bei der die Trennventile 10 (Markierung 201) und die Ausgleichsventile 14 (Markierung 202) geschlossen sind. Außerdem ist das Einlassventil 8 und das Auslassventil 9 für eine Radbremse, z. B. der vorne rechts, geRffnet (Markierung 203, 204) . Dies führt zu einer Entleerung des Speichers 6 über die Rücklaufleitung 18.The second switching sequence begins with a memory drain SE, in which the isolating valves 10 (marking 201) and the compensating valves 14 (marking 202) are closed. In addition, the inlet valve 8 and the outlet valve 9 for a wheel brake, for. B. the front right, open (marking 203, 204). This leads to the storage 6 being emptied via the return line 18.
Danach werden in einer Teilsequenz 2.1 alle Einlassventile 8 geRffnet, alle Auslassventile 9 geschlossen sowie die Trennventile 10 der beiden Bremskreise geschlossen, wobei die Ausgleichsventile 14 geRffnet bleiben kRnnen. Weiterhin bleibt der Radentlüfteranschluss vorne links offen bzw. der Radentlüfteranschluss 20, an dem sich die Entlüfterflasche befindet, offen, so dass die Pumpen 5 aus dem Druckmittelvorratsbehalter 4 in diesen Radentlüfteranschluss 20 pumpen (Markierung 205, 206) . Dabei wird insbesondere die Saugleitung 17 durchspült und damit entlüftet. Für die Pumpen 5 sind gegebenenfalls Schaltpausen vorzusehen. Zum Beenden dieser Teilsequenz 2.1 werden die Einlassventile 8 wieder geschlossen, wobei darauf zu achten ist, dass die Pumpen 5 ihren Betrieb kurz zuvor einstellen, um Druckspitzen zu vermeiden. Die Teilsequenz 2.1 kann bis zu 5 mal wiederholt werden.
Die folgende Teilsequenz 2.2 sieht zunächst wieder eine Speicherentladung SE und eine anschließende definierte Speicherfüllung SF vor, bei der die Einlassventile 8 geschlossen sind, während die Pumpe 5 fRrdert (Markierung 207) . Danach wird das Einlassventil vorne links in kurzen Takten von weniger als 0,1 Sekunden 40 mal geRffnet und geschlossen (Markierung 208) , so dass der Speicher 6 pulsartig entleert wird und das Druckmittel über den Ent- lüfteranschluss 20 vorne links abfließen kann. Durch die pulsartige Belastung des Systems werden anhaftende Blasen insbesondere im Ventilblock gelRst.Thereafter, in a partial sequence 2.1, all inlet valves 8 are opened, all outlet valves 9 are closed, and the separating valves 10 of the two brake circuits are closed, the compensating valves 14 being able to remain open. Furthermore, the wheel vent connection at the front left remains open or the wheel vent connection 20, on which the vent bottle is located, so that the pumps 5 pump from the pressure medium reservoir 4 into this wheel vent connection 20 (marking 205, 206). In particular, the suction line 17 is flushed and thus vented. If necessary, switching breaks must be provided for the pumps 5. To end this partial sequence 2.1, the inlet valves 8 are closed again, it being important to ensure that the pumps 5 stop operating shortly beforehand in order to avoid pressure peaks. The partial sequence 2.1 can be repeated up to 5 times. The following partial sequence 2.2 initially provides for a storage discharge SE and a subsequent defined storage filling SF, in which the inlet valves 8 are closed while the pump 5 is delivering (marking 207). The inlet valve at the front left is then opened and closed 40 times in short cycles of less than 0.1 seconds (marking 208), so that the reservoir 6 is emptied in a pulsed manner and the pressure medium can flow off via the vent connection 20 at the front left. The pulsing load on the system releases adhering bubbles, particularly in the valve block.
Daran schließt sich ein Schritt an, bei dem der Speicher wieder entleert wird und das System in den Grundzustand gesetzt wird.This is followed by a step in which the memory is emptied again and the system is reset to the basic state.
In der folgenden Schaltsequenz 3 (Figur 4) sind alle Einlassventile 8 und alle Auslassventile 9 geRffnet. Die Radentlüfteranschlüsse 20 sind geschlossen, so dass bei eingeschalteter Pumpe 5 (Markierung 301) Druckmittel aus dem Vorratsbehälter 4 über die Ein- und Auslassventile 8, 9 und über die Rücklaufleitung 18 zurück zum Druckmittelvorratsbehalter 4 gefRrdert wird. Dieser Schritt dient insbesondere der Entlüftung der Rücklaufleitung 18. Dort eingeschlossene Luft gelangt in den Druckmittelvorratsbehalter. Dort trennt sie sich vom Druckmittel und sammelt sich in der Gasphase oberhalb des Füllstandes.In the following switching sequence 3 (FIG. 4), all inlet valves 8 and all outlet valves 9 are opened. The wheel vent connections 20 are closed, so that when the pump 5 (marking 301) is switched on, pressure medium is conveyed from the reservoir 4 through the inlet and outlet valves 8, 9 and via the return line 18 back to the pressure medium reservoir 4. This step serves in particular to vent the return line 18. Air trapped there arrives in the pressure medium reservoir. There it separates from the pressure medium and collects in the gas phase above the level.
Im Prozessschritt 4 (Fig. 5) erfolgt ebenfalls eine Spülung der Rücklaufleitung 18. Dabei werden aber die Auslassventile 9 (Markierung 401 bis 404) nacheinander jeweils getaktet geschaltet, so dass wiederum Druckpulsationen erzeugt werden und die Rücklaufleitung 18 stoßweise durchspült wird. Auch dies soll bewirken, dass sich
Luftblasen lRsen. Die Schaltsequenz 4 kann zweimal durchgeführt werden.In process step 4 (FIG. 5), the return line 18 is also flushed. However, the outlet valves 9 (markings 401 to 404) are switched in succession in each case, so that pressure pulsations are again generated and the return line 18 is flushed intermittently. This should also cause that Release air bubbles. Switching sequence 4 can be carried out twice.
In einer abschließenden 5. Sequenz, dargestellt in der Figur 6, werden in Teilsequenzen 5.1, 5.2, 5.3 und 5.4 die Radentlüfteranschlüsse 20 nacheinander geRffnet (Markierung 501 bis 504), wobei, bevor das Einlassventil 8 der Radbremse mit geRffnetem Radentlüfteranschluss 20 geRffnet wird (Markierung 505) , zunächst die jeweils anderen drei Einlassventile (Triple) geRffnet werden (Markierung 506) , so dass sich in den geschlossenen Radbremsen ein Druck aufbaut, der kurz danach wieder auf ca. 2 bar durch Öffnen der zugehRrigen Auslassventile 9 bewerkstelligt wird (Markierung 507) . Dabei kann der Druck in den Radbremsen überwacht werden. Dieser muss mit den jeweiligen Schaltzuständen korrespondieren. Da auf diese Weise nacheinander in jeweils zu Triplen zusammengestellten Radbremsen ein Druck aufgebaut und wieder reduziert wird, lässt sich feststellen, ob gegebenenfalls eine Vertauschung von Leitungen stattgefunden hat.
In a concluding fifth sequence, shown in FIG. 6, the wheel bleeder connections 20 are opened one after the other in sub-sequences 5.1, 5.2, 5.3 and 5.4 (markings 501 to 504), whereby, before the inlet valve 8 of the wheel brake is opened with the wheel bleeder connection 20 opened ( Marking 505), first the other three intake valves (triple) are opened (marking 506) so that a pressure builds up in the closed wheel brakes, which is then restored to approx. 2 bar shortly afterwards by opening the associated exhaust valves 9 (marking 507). The pressure in the wheel brakes can be monitored. This must correspond to the respective switching states. Since in this way a pressure is built up and reduced again in succession in wheel brakes, each of which is composed of triples, it can be determined whether lines have possibly been interchanged.
Claims
1. Anschließen einer Entlüfterflasche an die Radentlüfteranschlüsse an den Radbremsen.1.Connect a bleed bottle to the wheel bleed connections on the wheel brakes.
2. Anschließen eines Entlüftergerätes an einen Füllstutzen des Druckmittelvorratsbehälters .2. Connect a breather device to a filler neck of the pressure medium reservoir.
3. Einschalten der Pumpe und FRrdern von Druckmittel aus dem Vorratsbehälter.3. Switch on the pump and convey pressure medium from the reservoir.
4. Schalten der Ein- und Auslassventile und der Trennventile derart, dass Druckmittel aus dem Hochdruckspeicher entweder zu den
Radentlüfteranschlüssen oder in den Druckmittelvorratsbehalter gelangt .4. Switch the inlet and outlet valves and the isolation valves in such a way that pressure medium from the high-pressure accumulator either to the Wheel vent connections or in the pressure medium reservoir.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass vor dem Einschalten der Pumpe eine konventionelle Entlüftung erfolgt .2. The method according to claim 1, characterized in that a conventional ventilation takes place before the pump is switched on.
3. Verfahren nach Anspruch 1 oder 2 , dadurch gekennzeichnet, dass bei einer Entlüftung in den Druckmittelvorratsbehalter die Pumpe getaktet angesteuert wird.3. The method according to claim 1 or 2, characterized in that the pump is controlled in a clocked manner when venting into the pressure medium reservoir.
4. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass bei einer Entlüftung in den Druckmittelvorratsbehalter die Auslassventile getaktet angesteuert werden.4. The method according to claim 1 or 2, characterized in that the exhaust valves are controlled in a timed manner when venting into the pressure medium reservoir.
5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Entlüftung mittels Pumpe in der folgenden Reihenfolge vorgenommen wird:5. The method according to any one of the preceding claims, characterized in that the ventilation is carried out by means of a pump in the following order:
Konventionelle Entlüftung in Richtung der Radentlüfteranschlüsse;Conventional ventilation in the direction of the wheel vent connections;
Pumpenentlüftung ebenfalls in Richtung Radentlüfteranschlüsse;Pump ventilation also in the direction of the wheel vent connections;
Laden des Speichers und Entlüften in Richtung der Radentlüfteranschlüsse;Loading the memory and venting in the direction of the wheel vent connections;
Laden des Speichers und Entlüften in Richtung des Druckmittelvorratsbehälters;Loading the reservoir and venting in the direction of the pressure medium reservoir;
Pumpenentlüftung in Richtung Radentlüfteranschlüsse .
Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass während einer Entlüftung des Bremssystems über den Radentlüfteranschluss eines Rades, die anderen drei Radbremsen durch Öffnen der zugehRrigen Einlassventile mit Druck beaufschlagt werden, wobei die Radbremsdrücke gemessen werden und die ermittelten Drucktriplen in Korrelation zu den geschalteten Einlassventilen 8 gebracht werden.
Pump ventilation in the direction of the wheel ventilation connections. Method according to one of the preceding claims, characterized in that during a bleeding of the brake system via the wheel bleeder connection of a wheel, the other three wheel brakes are pressurized by opening the associated inlet valves, the wheel brake pressures being measured and the determined pressure triples in correlation to the switched ones Inlet valves 8 are brought.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10237183 | 2002-08-14 | ||
DE10237183 | 2002-08-14 | ||
DE10309479A DE10309479A1 (en) | 2002-08-14 | 2003-03-05 | Process for bleeding and refilling an electro-hydraulic brake system |
DE10309479 | 2003-03-05 | ||
PCT/EP2003/008934 WO2004016487A1 (en) | 2002-08-14 | 2003-08-12 | Method for bleeding and refilling an electrohydraulic brake system |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1530531A1 true EP1530531A1 (en) | 2005-05-18 |
Family
ID=31889095
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03787766A Withdrawn EP1530531A1 (en) | 2002-08-14 | 2003-08-12 | Method for bleeding and refilling an electrohydraulic brake system |
Country Status (4)
Country | Link |
---|---|
US (1) | US20060192426A1 (en) |
EP (1) | EP1530531A1 (en) |
JP (1) | JP2005535518A (en) |
WO (1) | WO2004016487A1 (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10308737A1 (en) * | 2002-08-13 | 2004-02-26 | Continental Teves Ag & Co. Ohg | Checking venting quality of electrohydraulic braking system involves determining volumetric drain of main cylinder and line and of brake circuit, outputting warning if defined criteria unfulfilled |
DE102005008851A1 (en) * | 2004-04-29 | 2005-12-01 | Continental Teves Ag & Co. Ohg | Method for venting an electronic vehicle brake system |
JP2007186140A (en) * | 2006-01-16 | 2007-07-26 | Hitachi Ltd | Brake hydraulic system, brake air bleeding work support device, and air bleeding method of brake hydraulic system |
SE530014C2 (en) * | 2006-06-08 | 2008-02-12 | Nail Al-Madanat | Apparatus for aeration of hydraulic systems in motor vehicles |
CN101815638A (en) * | 2007-10-05 | 2010-08-25 | 罗伯特.博世有限公司 | Hydraulic power brake system |
CN103354891A (en) * | 2011-02-07 | 2013-10-16 | 三菱电机株式会社 | Air-conditioning device |
EP2581281B1 (en) * | 2011-10-13 | 2019-02-27 | Ford Global Technologies, LLC | Method of bleeding a hydraulic braking system |
DE102013223363A1 (en) * | 2012-11-20 | 2014-05-22 | Ford Global Technologies, Llc | Method for venting of hydraulic brake system of vehicle e.g. passenger car, involves applying higher pressure to brake assembly by pumping device for given period, without opening vent valves |
US10457265B2 (en) * | 2017-03-09 | 2019-10-29 | Ford Global Technologies, Llc | Methods and apparatus to facilitate brake bleeding |
CN111278697B (en) | 2017-11-09 | 2022-08-16 | 罗伯特·博世有限公司 | Vehicle braking system for self-contained circuit filling and method of operation |
JP2020019300A (en) * | 2018-07-30 | 2020-02-06 | 株式会社アドヴィックス | Vehicle braking device |
IT201800007883A1 (en) * | 2018-08-06 | 2020-02-06 | Maserati Spa | Adapter for an integrated unit with bleed valve, temperature sensor and pressure sensor for a brake caliper. |
FR3091509B1 (en) * | 2019-01-03 | 2021-01-22 | Bosch Gmbh Robert | "Method for bleeding a decoupled braking system and braking system applying this method" |
WO2021074045A1 (en) | 2019-10-15 | 2021-04-22 | Airbus Operations Limited | A method of removing hydraulic fluid from an aircraft hydraulic system, an aircraft hydraulic system, and an aircraft |
DE102019220355A1 (en) * | 2019-12-20 | 2021-06-24 | Robert Bosch Gesellschaft mit beschränkter Haftung | Hydraulic external vehicle brake system and method for filling a hydraulic external vehicle brake system |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3806840C2 (en) * | 1988-03-03 | 1999-09-23 | Bayerische Motoren Werke Ag | Hydraulic unit of an anti-lock control system of a vehicle brake system |
DE19528859A1 (en) * | 1995-08-05 | 1997-02-06 | Teves Gmbh Alfred | Process for venting a slip-controlled dual-circuit brake system for motor vehicles |
DE19654087A1 (en) * | 1996-12-23 | 1998-06-25 | Teves Gmbh Alfred | Process for the bubble-free filling of a hydraulic motor vehicle brake system with brake fluid |
DE19700410A1 (en) * | 1997-01-09 | 1998-07-16 | Teves Gmbh Alfred | Hydraulic unit |
EP1345800B1 (en) * | 2000-11-23 | 2013-05-15 | Continental Teves AG & Co. oHG | Method for operating an electronically controllable brake actuation system, and an electronically controllable brake actuation system |
WO2004016489A1 (en) * | 2002-08-14 | 2004-02-26 | Continental Teves Ag & Co. Ohg | Method for changing the pressure medium in an electrohydraulic braking system |
US6796339B1 (en) * | 2003-07-03 | 2004-09-28 | Phoenix Systems, L.L.C. | Apparatus for flushing, replacing fluid and bleeding hydraulic systems |
-
2003
- 2003-08-12 US US10/524,389 patent/US20060192426A1/en not_active Abandoned
- 2003-08-12 JP JP2005502016A patent/JP2005535518A/en not_active Withdrawn
- 2003-08-12 EP EP03787766A patent/EP1530531A1/en not_active Withdrawn
- 2003-08-12 WO PCT/EP2003/008934 patent/WO2004016487A1/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2004016487A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2004016487A1 (en) | 2004-02-26 |
US20060192426A1 (en) | 2006-08-31 |
JP2005535518A (en) | 2005-11-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP2819899B1 (en) | Method for operating a brake system and a brake system | |
EP1968830B1 (en) | Electro-pneumatic brake control device | |
EP1530531A1 (en) | Method for bleeding and refilling an electrohydraulic brake system | |
EP1451051B1 (en) | Electrohydraulic braking system with a pedal travel simulator consisting of a spring loaded pressure cylinder and a mechanically coupled servo piston | |
DE102016224052B4 (en) | Electric braking system | |
DE3232051A1 (en) | METHOD FOR MONITORING AND CONTROLLING EXTERNAL ENERGY-SUPPLIED HYDRAULIC BRAKE-SLIP CONTROL SYSTEMS AND DEVICE FOR IMPLEMENTING THE METHOD | |
DE102009045714A1 (en) | Slip-controlled hydraulic vehicle brake system | |
EP1417118B1 (en) | Method used for bleeding a hydraulic vehicle brake system | |
DE10321959A1 (en) | Hydraulic braking system for motor vehicles | |
EP1530532B1 (en) | Method for monitoring the air bleeding quality of an electrohydraulic braking system | |
EP1536997B1 (en) | Method for changing the pressure medium in an electrohydraulic braking system | |
DE102019220355A1 (en) | Hydraulic external vehicle brake system and method for filling a hydraulic external vehicle brake system | |
DE3511975C2 (en) | Hydraulic brake booster | |
DE10309479A1 (en) | Process for bleeding and refilling an electro-hydraulic brake system | |
DE102017202806A1 (en) | Brake system for a motor vehicle and method for operating a brake system for a motor vehicle | |
DE102014222573A1 (en) | Hydraulic device of a vehicle brake system | |
DE19600603B4 (en) | Hydraulic brake system for a motor vehicle | |
DE10215867B4 (en) | Electrohydraulic brake system with compressed gas assisted fallback level | |
DE10304145A1 (en) | Electrohydraulic vehicle braking system has isolating valve between brake cylinder and brake fluid supply tank that can be controlled independently of operation of main brake cylinder | |
WO2021078997A1 (en) | Method for operating a brake system with an integrated parking brake, and brake system | |
DE112018005204T5 (en) | Vehicle braking system for filling a self-contained circuit and method of operation | |
DE102022212867A1 (en) | Method for operating a braking system when a leak is detected and control device for carrying out such a method | |
DE102022210984A1 (en) | Method for determining a leakage of a valve of a brake system and control device for carrying out the method | |
DE102022213917A1 (en) | Method for operating a braking system when a leak is detected and control device for carrying out such a method | |
DE102019219126A1 (en) | Decoupled brake system and method for removing air pockets from the brake fluid lines of the decoupled brake system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20050314 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT RO SE TR |
|
RBV | Designated contracting states (corrected) |
Designated state(s): DE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20060525 |