DE19546056A1 - Hydraulic brake system with high pressure source and pedal operated metering valve - Google Patents

Hydraulic brake system with high pressure source and pedal operated metering valve

Info

Publication number
DE19546056A1
DE19546056A1 DE1995146056 DE19546056A DE19546056A1 DE 19546056 A1 DE19546056 A1 DE 19546056A1 DE 1995146056 DE1995146056 DE 1995146056 DE 19546056 A DE19546056 A DE 19546056A DE 19546056 A1 DE19546056 A1 DE 19546056A1
Authority
DE
Germany
Prior art keywords
brake
pressure
valve
high pressure
pressure source
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Withdrawn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
DE1995146056
Other languages
German (de)
Inventor
Thomas Meier
Peter Dr Volz
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.)
Continental Teves AG and Co OHG
Original Assignee
ITT Automotive Europe GmbH
Alfred Teves GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ITT Automotive Europe GmbH, Alfred Teves GmbH filed Critical ITT Automotive Europe GmbH
Priority to DE1995146056 priority Critical patent/DE19546056A1/en
Priority to PCT/EP1996/005182 priority patent/WO1997021574A1/en
Priority to EP96941015A priority patent/EP0862526A1/en
Publication of DE19546056A1 publication Critical patent/DE19546056A1/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/0195—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the regulation being combined with other vehicle control systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
    • B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
    • B60G17/056—Regulating distributors or valves for hydropneumatic 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
    • 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
    • B60T13/12—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 the fluid being liquid
    • B60T13/16—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 the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs
    • 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
    • B60T8/321—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 deceleration
    • B60T8/328—Systems sharing components with other fluid systems onboard the vehicle
    • B60T8/3285—Systems sharing components with other fluid systems onboard the vehicle the other fluid systems being suspension elements
    • 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
    • B60T8/343—Systems characterised by their lay-out
    • B60T8/344—Hydraulic systems
    • B60T8/348—4 Channel 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
    • B60T8/44—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
    • B60T8/445—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems replenishing the released brake fluid volume into the brake piping
    • 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
    • B60T8/48—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 connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
    • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/011—Modular constructions
    • B60G2206/0116—Integrated distribution control units with valves, accumulators, PCB's or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2400/00—Indexing codes relating to detected, measured or calculated conditions or factors
    • B60G2400/50—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/30—Height or ground clearance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/22—Braking, stopping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2800/00—Indexing codes relating to the type of movement or to the condition of the vehicle and to the end result to be achieved by the control action
    • B60G2800/90—System Controller type
    • B60G2800/92—ABS - Brake Control

Abstract

The invention relates to a hydraulic double-circuit brake system for motor vehicles with a hydraulic high pressure source (5) with a pressure which can be fed via a pedal-operated dosing valve (7) into two brake circuits I and II. The advantage of these brake systems is that one high pressure source is sufficient for any type of braking, i.e. ABS, traction control and standard braking. To achieve active braking in both brake circuits, the high pressure source has to be connectable to the two brake circuits by bypassing the dosing valve (7), while keeping the circuits separate. This is achieved by a valve arrangement (39) which has a check valve in the pressure line (10) from the high pressure source (5) to the brake circuits (I, II), and the pressure line (10) divides into two pressure branches (29, 30) downstream of said valve. The pressure branches are provided with nonreturn valves (31, 32) which prevent return flow of pressure means. It is also possible to provide each pressure branch (29, 30) with a check valve.

Description

Die vorliegende Erfindung betrifft eine hydraulische Zweikreis­ bremsanlage gemäß dem Oberbegriff des Anspruchs 1. Derartige Bremsanlagen werden bereits eingesetzt für Fahrzeuge, welche eine Vorderachs-Hinterachs-Bremskreisaufteilung besitzen und zum Zwecke der Antriebsschlupfregelung eine Druckleitung von der Hochdruckquelle zum Bremskreis der angetriebenen Räder auf­ weisen. Derartige Bremsanlagen haben den Vorteil, daß für eine pedalbetätigte Normalbremsung, zur Bremsschlupfregelung und zur Antriebsschlupfregelung insgesamt nur eine Hochdruckquelle benötigt wird, welche zudem gegebenenfalls noch Druckmittel zu einer Niveauregulierung des Fahrzeugs zur Verfügung stellen kann. Aktivbremsungen, also Bremsdruckaufbau unabhängig vom Bremspedal, sind aber unter bestimmten Bedingungen in beiden Bremskreisen erforderlich. Beispielsweise eine Antriebsschlupf­ regelung bei diagonaler Bremskreisaufteilung erfordert die Möglichkeit einer Aktivbremsung beider Radbremsen der angetrie­ benen Achse. Da diese sich dann jedoch in unterschiedlichen Bremskreisen befinden, ergibt sich das Problem, wie im zweiten Bremskreis eine Aktivbremsung durchzuführen ist. Dasselbe Pro­ blem stellt sich, wenn eine gattungsgemäße Bremsanlage mit der Möglichkeit der Giermomentenregelung durch Bremseneingriff ausgestattet werden soll. Je nach Fahrsituation sind dann kur­ veninnere oder kurvenäußere Räder der Vorderachse oder Hinter­ achse zu bremsen. Auch hier muß also eine Aktivbremsung in beiden Bremskreisen möglich sein.The present invention relates to a hydraulic dual circuit Brake system according to the preamble of claim 1. Such Brake systems are already used for vehicles that have a front axle-rear axle brake circuit division and for the purpose of traction control a pressure line from the high pressure source to the brake circuit of the driven wheels point. Such braking systems have the advantage that for a Pedal-operated normal braking, for brake slip control and Total traction control only one high pressure source is required, which may also add pressure medium provide a level control of the vehicle can. Active braking, i.e. brake pressure build-up regardless of Brake pedal, but are under certain conditions in both Brake circuits required. For example a traction slip control with diagonal brake circuit division requires Possibility of active braking of both wheel brakes of the driven lower axis. However, since these then differ in Brake circuits, the problem arises, as in the second Brake circuit active braking is to be carried out. The same pro blem arises when a generic brake system with the Possibility of yaw moment control through brake intervention to be equipped. Depending on the driving situation are then cure inner or outer wheels of the front axle or rear  brake axis. Active braking must also be carried out here be possible with both brake circuits.

Die Aufgabe der vorliegenden Erfindung besteht darin, eine Bremsanlage der eingangs genannten Art auf möglichst preiswerte Weise für eine Aktivbremsung in beiden Bremskreisen auf zurü­ sten.The object of the present invention is a Brake system of the type mentioned in the cheapest possible Way for active braking in both brake circuits most.

Diese Aufgabe wird gelöst in Verbindung mit den kennzeichnenden Merkmalen des Anspruchs 1. Das Prinzip der vorliegenden Erfin­ dung besteht darin, auf eine weitere Druckquelle zu verzichten, dafür aber durch geeignete Ventilanordnungen eine Bremskreis­ trennung auch während einer Aktivbremsung sicherzustellen.This problem is solved in connection with the characteristic ones Features of claim 1. The principle of the present invention is to do without another pressure source, but a brake circuit through suitable valve arrangements ensure separation even during active braking.

Eine geeignete Ventilanordnung weist in jedem Druckzweig, wel­ cher von der Druckleitung zu den einzelnen Bremsleitungen führt, ein Rückschlagventil auf, welches ein Rückströmen des Druckmittels aus den Bremskreisen in die Druckleitung verhin­ dert. Die Druckleitung selbst kann dann durch ein Schaltventil sperrbar sein, so daß die Druckmittelverbindung von der Hoch­ druckquelle am Dosierventil vorbei zu den Bremskreisen unter­ bunden ist, solange eine Aktivbremsung nicht benötigt wird.A suitable valve arrangement has wel in each pressure branch cher from the pressure line to the individual brake lines leads, a check valve, which prevents the backflow of the Prevent pressure medium from the brake circuits into the pressure line different. The pressure line itself can then through a switching valve be lockable so that the pressure medium connection from the high pressure source past the metering valve to the brake circuits below is tied as long as active braking is not required.

Eine andere geeignete Ventilanordnung sieht in jedem der beiden Druckzweige ein Schaltventil vor. Diese Lösung ist zwar etwas teurer als die erstgenannte, hat jedoch den Vorteil, daß eine Aktivbremsung auch selektiv in einem der beiden Bremskreise vorgenommen werden kann, ohne den anderen Bremskreis zu beein­ flussen. A different suitable valve arrangement is seen in each of the two Pressure branches upstream of a switching valve. This solution is something more expensive than the former, but has the advantage that a Active braking also selectively in one of the two brake circuits can be made without affecting the other brake circuit rivers.  

Diese Einrichtung zur Aktivbremsung schmälert nicht die Mög­ lichkeiten, die Hochdruckquelle der Bremsanlage auch für andere Zwecke als zur Bremsung zu nutzen.This device for active braking does not reduce the possibilities opportunities, the high pressure source of the brake system for others Purposes than to use for braking.

Eine nähere Erläuterung des Erfindungsgedankens erfolgt nun anhand der Beschreibung einer Zeichnung in zwei Figuren. Es zeigt:A more detailed explanation of the inventive concept is now given based on the description of a drawing in two figures. It shows:

Fig. 1 den hydraulischen Schaltplan einer erfindungsgemäßen Bremsanlage, Fig. 1 shows the hydraulic circuit diagram of a brake system according to the invention,

Fig. 2 einen Ausschnitt aus einer erfindungsgemäßen Bremsanla­ ge, welcher einen entsprechenden Ausschnitt aus Fig. 1 ersetzen kann. Fig. 2 shows a section of a brake system according to the invention, which can replace a corresponding section from Fig. 1.

Fig. 1 zeigt eine hydraulische Schaltung einer Bremsanlage mit diagonaler Bremskreisaufteilung, welche zur Antriebs­ schlupfregelung geeignet ist. Die Bremsanlage weist einen Vorratsbehälter 1 auf, an welchen die Saugseite eine Hochdruckpumpe 2 angeschlossen ist. Diese Hoch­ druckpumpe 2 lädt über ein Druckbegrenzungsventil 3 einen Hochdruckspeicher 4. Das Druckbegrenzungsventil 3 begrenzt den Druck im Hochdruckspeicher 4 und schließt die Druckseite der Hochdruckpumpe 2 mit dem Vorrats­ behälter 1 kurz, sobald der Hochdruckspeicher 4 seinen gewünschten Ladedruck erreicht hat. Hochdruckpumpe 2, Druckbegrenzungsventil 3 und Hochdruckspeicher 4 bilden zusammen eine Hochdruckquelle 5, deren Druck für die Funktion der gesamten Bremsanlage ausgenutzt wird. Fig. 1 shows a hydraulic circuit of a brake system with diagonal brake circuit division, which is suitable for drive slip control. The brake system has a reservoir 1 to which the suction side of a high-pressure pump 2 is connected. This high-pressure pump 2 charges via a pressure control valve 3 is a high-pressure accumulator. 4 The pressure relief valve 3 limits the pressure in the high-pressure accumulator 4 and closes the pressure side of the high-pressure pump 2 with the storage container 1 as soon as the high-pressure accumulator 4 has reached its desired boost pressure. High-pressure pump 2 , pressure-limiting valve 3 and high-pressure accumulator 4 together form a high-pressure source 5 , the pressure of which is used for the function of the entire brake system.

Die Hochdruckquelle 5 ist über ein Vorrangventil 6 an ein Do­ sierventil 7 angeschlossen, welches einer hydraulischen Steuer­ einheit 8 abhängig von der Betätigung eines Bremspedals 9 den Druck zuführt. Das Vorrangventil hat die Aufgabe, eine Niveau­ regulierungsanlage NR nur dann den Hochdruck der Hochdruckquel­ le 5 zur Verfügung zu stellen, wenn dieser Hochdruck nicht zu einer Bremsung - sei es mit oder ohne Pedalbetätigung - benö­ tigt wird. Das Vorrangventil 6 speist zum einen das Dosierven­ til 7, welches den Bremsdruck pedalwegabhängig an die hydrau­ lische Steuereinheit 8 weitergibt und zum anderen die Druck­ leitung 10, welche unter Umgehung des Dosierventils 7 direkt in die hydraulische Steuereinheit 8 hineingeführt ist. Die Druck­ leitung 10 weist noch einen Sicherheitsspeicher 45 auf, der einen Reservedruck zur Verfügung zu stellen vermag, falls das Vorrangventil 6 fehlerhaft schalten sollte und der Hochdruck der Hochdruckquelle 5 nicht zur Verfügung steht.The high pressure source 5 is connected via a priority valve 6 to a Do sierventil 7 , which supplies a hydraulic control unit 8 depending on the operation of a brake pedal 9, the pressure. The priority valve has the task of providing a level control system NR only with the high pressure of the high pressure source 5 if this high pressure is not required for braking - be it with or without pedal actuation. The priority valve 6 feeds on the one hand the Dosierven valve 7 , which passes the brake pressure depending on the pedal travel to the hy metallic control unit 8 and on the other hand the pressure line 10 , which is bypassed the metering valve 7 directly into the hydraulic control unit 8 . The pressure line 10 also has a safety store 45 , which is able to provide a reserve pressure if the priority valve 6 should switch incorrectly and the high pressure of the high pressure source 5 is not available.

Für einen Bremsdruckabbau besitzt das Dosierventil 7 noch eine Entlastungsleitung 13, in welche eine Entlastungsleitung 14 der Niveauregulierung NR einmündet. Die Entlastungsleitung 13 führt zum Vorratsbehälter 1. Sie dient zu einem Bremsdruckabbau bei Lösen des Bremspedals 9.For brake pressure reduction, the metering valve 7 also has a relief line 13 , into which a relief line 14 of the level control NR opens. The relief line 13 leads to the reservoir 1 . It serves to reduce the brake pressure when the brake pedal 9 is released .

Vom Dosierventil 7 gehen zwei symmetrisch aufgebaute Bremskrei­ se I und II aus, deren Bremsleitungen 11 bzw. 12 ebenfalls in die hydraulische Steuereinheit 8 führen.From the metering valve 7 two symmetrically constructed Bremskrei se I and II, the brake lines 11 and 12 also lead into the hydraulic control unit 8 .

Die nun folgende Beschreibung des Bremskreises I innerhalb der hydraulischen Steuereinheit 8 gilt analog auch für den Brems­ kreis II. Die Bremsleitung 11 teilt sich an einem Knotenpunkt 15 in zwei Bremszweige 16 und 17 auf. Der Bremszweig 16 führt über ein Einlaßventil 18 zur Radbremse 20 eines nicht angetrie­ benen Rades. Der Bremszweig 17 durchläuft ein Trennventil 22 und führt über ein Einlaßventil 19 zur Radbremse 21 eines an­ getriebenen Rades. Von den Radbremsen 20 und 21 führen Aus­ laßleitungen 23 bzw. 24 über jeweils ein Auslaßventil 25 bzw. 26 in eine Hauptauslaßleitung 27, welche in die Entlastungs­ leitung 13 einmündet. Diese Auslaßleitungen 23, 24 und 27 dienen dem Bremsdruckabbau im Rahmen einer Schlupfregelung.The following description of the brake circuit I within the hydraulic control unit 8 also applies analogously to the brake circuit II. The brake line 11 is divided into two brake branches 16 and 17 at a node 15 . The brake branch 16 leads via an inlet valve 18 to the wheel brake 20 of a wheel not driven. The brake branch 17 passes through a isolating valve 22 and leads via an inlet valve 19 to the wheel brake 21 of a driven wheel. From the wheel brakes 20 and 21 lead from the inlet lines 23 and 24 via an outlet valve 25 and 26 respectively in a main outlet line 27 , which opens into the relief line 13 . These outlet lines 23 , 24 and 27 serve to reduce the brake pressure as part of a slip control.

Die Druckleitung 10 ist innerhalb der hydraulischen Steuerein­ heit 8 mit einem elektromagnetisch betätigten, stromlos ge­ schlossenen 2-2-Wegeventil 28 versehen und teilt sich stromab dieses Sperrventils 28 in zwei Druckzweige 29 und 30 auf. Jeder der Druckzweige 29 und 30 ist mit einem Rückschlagventil 31 bzw. 32 versehen, welches ein Rückströmen von Druckmittel zur Druckleitung 10 hin verhindert. Der Druckzweig 29 mündet in den Bremszweig 17 ein zwischen dem Trennventil 22 und dem Einlaß­ ventil 19. Entsprechend mündet der Druckzweig 30, welcher dem Bremskreis 11 zugeordnet ist, in den zugehörigen Bremskreis 33, welcher zur Radbremse 34 eines angetriebenen Rades führt.The pressure line 10 is provided within the hydraulic Steuerein unit 8 with an electromagnetically actuated, normally closed 2-2-way valve 28 and is divided downstream of this check valve 28 into two pressure branches 29 and 30 . Each of the pressure branches 29 and 30 is provided with a check valve 31 or 32 which prevents pressure medium from flowing back to the pressure line 10 . The pressure branch 29 opens into the brake branch 17 between the isolating valve 22 and the inlet valve 19th Correspondingly, the pressure branch 30 , which is assigned to the brake circuit 11 , opens into the associated brake circuit 33 , which leads to the wheel brake 34 of a driven wheel.

Die dargestellte Bremsanlage erlaubt bei diagonaler Bremskreis­ aufteilung eine Aktivbremsung durch die Hochdruckquelle 5 unter Umgehung des Dosierventils 7 nur in die Radbremsen 21 und 34 einer Achse. Soll die Möglichkeit einer Aktivbremsung für beide Räder eines Bremskreises verwirklicht werden, so müssen ledig­ lich die Bremszweige 16 und 35, welche zu den Radbremsen 20 und 36 der zusätzlich aktiv zu bremsenden Räder führen, auf der anderen Seite des Trennventils 22 bzw. 37 von der Bremsleitung 11 bzw. 12 abzweigen. Das bedeutet, daß die Trennventile 22 und 37 dann in den Bremsleitungen 11 bzw. 12 angeordnet sind und die Knotenpunkte 15 bzw. 38 auf die andere Seite der Trennven­ tile 22 bzw. 37 verschoben sind.The brake system shown allows a diagonal brake circuit division active braking by the high pressure source 5 bypassing the metering valve 7 only in the wheel brakes 21 and 34 of an axle. If the possibility of active braking for both wheels of a brake circuit is to be realized, then only the brake branches 16 and 35 , which lead to the wheel brakes 20 and 36 of the additionally actively braked wheels, have to be realized on the other side of the isolating valve 22 and 37, respectively Branch off brake line 11 or 12 . This means that the isolation valves 22 and 37 are then arranged in the brake lines 11 and 12 and the nodes 15 and 38 are moved to the other side of the Trennven tile 22 and 37 , respectively.

Alternativ zu der dargestellten Ventilkombination 39 bestehend aus Sperrventil 28 und Rückschlagventilen 31 und 32 kann auch eine Ventilkombination 40 gemäß Fig. 2 in das Schaltbild von Fig. 1 eingesetzt werden. Die Druckleitung 10 ist in dieser Version nicht mit einem Sperrventil versehen, dafür aber die Druckzweige 29 und 30. Jedes der beiden Sperrventile 41 und 42 ist ein elektromagnetisch betätigtes, stromlos geschlossenes 2-2-Wegeventil. Selbstverständlich eignet sich auch die Ventil­ anordnung 40 für eine Bremsanlage, welche eine Aktivbremsung in den Radbremsen beider Achsen erlaubt.As an alternative to the illustrated valve combination 39 consisting of shut-off valve 28 and check valves 31 and 32 , a valve combination 40 according to FIG. 2 can also be used in the circuit diagram of FIG. 1. The pressure line 10 is not provided with a check valve in this version, but instead the pressure branches 29 and 30 . Each of the two check valves 41 and 42 is an electromagnetically operated, normally closed 2-2-way valve. Of course, the valve assembly 40 is also suitable for a brake system which allows active braking in the wheel brakes of both axles.

Wenn eine Aktivbremsung in der Bremsanlage nach Fig. 1 oder Fig. 2 nicht nur zum Zwecke der Antriebsschlupfregelung, son­ dern auch beispielsweise zur Giermomentenregelung eingesetzt werden soll, empfiehlt es sich, in die vom Dosierventil 7 aus­ gehenden Bremsleitungen 11 und 12 Drucksensoren 43 und 44 ein­ zufügen. Damit ist sichergestellt, daß eine Betätigung des Bremspedals 9 erkannt werden kann, da dann das Dosierventil 7 über die Bremsleitungen 11 und 12 Druck in die hydraulische Steuereinheit 8 einspeist. In diesem Fall muß bei einer Aktiv­ bremsung die Drucküberlagerung von pedalbetätigter Bremsung und pedalunabhängiger Bremsung berücksichtigt werden. Bei einer Giermomentenregelung kann entweder nur das Einbremsen in eine Achse vorgesehen sein, so daß die hydraulische Steuereinheit 8 wie dargestellt verwendet werden kann. Normalerweise wird je­ doch zur Giermomentenregelung eine Möglichkeit zur Aktivbrem­ sung in die Radbremsen beider Achsen gefordert, so daß die hydraulische Steuereinheit 8 in der zuvor beschriebenen modifi­ zierten Form Verwendung findet.If active braking in the brake system according to FIG. 1 or FIG. 2 is to be used not only for the purpose of traction control, but also, for example, for yaw moment control, it is advisable to use pressure sensors 43 and 44 in the brake lines 11 and 12 going from the metering valve 7 add one. This ensures that actuation of the brake pedal 9 can be detected since the metering valve 7 then feeds pressure into the hydraulic control unit 8 via the brake lines 11 and 12 . In this case, the pressure overlay of pedal-operated braking and pedal-independent braking must be taken into account for active braking. In the case of a yaw moment control, only braking into one axis can be provided, so that the hydraulic control unit 8 can be used as shown. Normally, depending on the yaw moment control, a possibility for active braking solution in the wheel brakes of both axes is required, so that the hydraulic control unit 8 is used in the previously described modified form.

Die Sperrventile 28, 41 und 42 bleiben bei jeder pedalbetä­ tigten Bremsung geschlossen. Daher kann sich auch der Sicher­ heitsspeicher 11 zwischen dem Vorrangventil 6 und dem Dosier­ ventil 7 nicht entladen, es sei denn, daß die Niveauregulie­ rungsanlage NR aus dem Sicherheitsspeicher 11 Druckmittel benö­ tigt. Grundsätzlich wird jedoch der Hochdruck aus der Hoch­ druckquelle 5 bereitgestellt. Die Druckregelung an den Radbrem­ sen 20, 21, 34, 36 erfolgt auf an sich bekannte Weise über die Einlaßventile und die Auslaßventile der hydraulischen Steuer­ einheit 8.The check valves 28 , 41 and 42 remain closed with each pedalbetätten braking. Therefore, the safety memory 11 between the priority valve 6 and the metering valve 7 can not discharge, unless the level control system NR from the safety memory 11 requires pressure fluid. Basically, however, the high pressure from the high pressure source 5 is provided. The pressure control on the Radbrem sen 20 , 21 , 34 , 36 is carried out in a known manner via the inlet valves and the outlet valves of the hydraulic control unit 8th

Die erfindungsgemäßen Bremsanlagen gemäß Fig. 1, Fig. 2 oder in modifizierter Form mit einer Möglichkeit zur Aktivbremsung an beiden Fahrzeugachsen haben also den Vorteil, daß durch die Ventilanordnungen 39 und 40 eine sichere Kreistrennung bewirkt wird, so daß eine einzige Hochdruckquelle 5 für alle Zwecke der Bremsbetätigung ausreicht.The brake systems according to FIG. 1, FIG. 2 or in a modified form with a possibility for active braking on both vehicle axles thus have the advantage that a reliable circuit separation is effected by the valve arrangements 39 and 40 , so that a single high-pressure source 5 for all purposes the brake application is sufficient.

Claims (5)

1. Hydraulische Zweikreisbremsanlage für Kraftfahrzeuge, mit einer hydraulischen Hochdruckquelle (5), deren Druck über ein pedalbetätigtes Dosierventil (7) in zwei Bremsleitungen (11, 12) einspeisbar ist, die über Bremszweige (16, 17, 33, 35) mit jeweils mindestens einer Radbremse (20, 21, 34, 36) ver­ bunden sind, mit Auslaßleitungen (23, 24, 27) von den Rad­ bremsen (20, 21) zu einem Vorratsbehälter (1), mit Einlaß­ ventilen (18, 19) in den Bremszweigen (16, 17) und Auslaßven­ tilen (25, 26) in den Auslaßleitungen (23, 24), mit einer sperrbaren Druckleitung (10), die von der Hochdruckquelle (5) her unter Umgehung des Dosierventils (7) an zumindest eine der Bremsleitungen (16, 17) anknüpft, wobei diese Bremsleitung (17) ein Trennventil (22) zwischen Anknüpfung der Druckleitung (10) und dem Dosierventil (7) aufweist, dadurch gekennzeichnet, daß auch die andere Bremsleitung (12) ein Trennventil (37) aufweist und die Druckleitung (10) sich in zwei mit Ventilen (31, 32) versehene Druckzwei­ ge (29, 30) aufteilt, von denen jeder an die Bremsleitungen (17) zwischen Trennventil (22) und Einlaßventil (19) an­ knüpft.1.Hydraulic dual-circuit brake system for motor vehicles, with a hydraulic high-pressure source ( 5 ), the pressure of which can be fed into two brake lines ( 11 , 12 ) via a pedal-operated metering valve ( 7 ), each with at least one brake branch ( 16 , 17 , 33 , 35 ) a wheel brake ( 20 , 21 , 34 , 36 ) are connected, with outlet lines ( 23 , 24 , 27 ) from the wheel brakes ( 20 , 21 ) to a reservoir ( 1 ), with inlet valves ( 18 , 19 ) in the Brake branches ( 16 , 17 ) and outlet valves ( 25 , 26 ) in the outlet lines ( 23 , 24 ), with a lockable pressure line ( 10 ) from the high pressure source ( 5 ) bypassing the metering valve ( 7 ) to at least one of the Connecting brake lines ( 16 , 17 ), this brake line ( 17 ) having a separating valve ( 22 ) between connecting the pressure line ( 10 ) and the metering valve ( 7 ), characterized in that the other brake line ( 12 ) also has a separating valve ( 37 ) has and the Druc Kleitung ( 10 ) divided into two valves ( 31 , 32 ) Druckzwei ge ( 29 , 30 ), each of which links to the brake lines ( 17 ) between the isolation valve ( 22 ) and inlet valve ( 19 ). 2. Bremsanlage nach Anspruch 1, dadurch gekennzeichnet, daß jeder Druckzweig (29, 30) ein Rückschlagventil (31, 32) auf­ weist, das von der Hochdruckquelle (5) zu den Radbremsen (21, 34) hin öffnet.2. Brake system according to claim 1, characterized in that each pressure branch ( 29 , 30 ) has a check valve ( 31 , 32 ) which opens from the high pressure source ( 5 ) to the wheel brakes ( 21 , 34 ). 3. Bremsanlage nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß jeder Druckzweig (29, 30) ein Sperrventil (41, 42) auf­ weist. 3. Brake system according to claim 1 or 2, characterized in that each pressure branch ( 29 , 30 ) has a check valve ( 41 , 42 ). 4. Bremsanlage nach einem der vorhergehenden Ansprüche, da­ durch gekennzeichnet, daß jede der beiden Bremsleitungen (11, 12) zwischen Dosierventil (7) und Trennventil (22, 37) einen Drucksensor (43, 44) aufweist, der den durch das Do­ sierventil (7) eingespeisten Druck erfaßt.4. Brake system according to one of the preceding claims, characterized in that each of the two brake lines ( 11 , 12 ) between the metering valve ( 7 ) and the isolation valve ( 22 , 37 ) has a pressure sensor ( 43 , 44 ) which through the Do sierventil ( 7 ) fed pressure detected. 5. Bremsanlage nach einem der vorhergehenden Ansprüche, da­ durch gekennzeichnet, daß die Hochdruckquelle (5) eine Hochdruckpumpe (2) und einen Hochdruckspeicher (4) umfaßt und zwischen Hochdruckquelle (5) und Dosierventil (7) ein Vorrangventil (6) angeordnet ist, welches den Hochdruck zu einer Niveauregulierungsanlage (NR) des Fahrzeugs abzweigt, wenn dieser Hochdruck nicht zur Bremsbetätigung benötigt wird.5. Brake system according to one of the preceding claims, characterized by that the high pressure source (5) a high pressure pump (2) and a high pressure accumulator (4) and arranged between the high pressure source (5) and metering valve (7) is a priority valve (6), which branches off the high pressure to a level control system (NR) of the vehicle when this high pressure is not required for brake actuation.
DE1995146056 1995-12-09 1995-12-09 Hydraulic brake system with high pressure source and pedal operated metering valve Withdrawn DE19546056A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1995146056 DE19546056A1 (en) 1995-12-09 1995-12-09 Hydraulic brake system with high pressure source and pedal operated metering valve
PCT/EP1996/005182 WO1997021574A1 (en) 1995-12-09 1996-11-23 Hydraulic brake system with high pressure source and pedal-operated dosing valve
EP96941015A EP0862526A1 (en) 1995-12-09 1996-11-23 Hydraulic brake system with high pressure source and pedal-operated dosing valve

Applications Claiming Priority (1)

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DE1995146056 DE19546056A1 (en) 1995-12-09 1995-12-09 Hydraulic brake system with high pressure source and pedal operated metering valve

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DE102013212135A1 (en) * 2013-06-25 2015-01-08 Bayerische Motoren Werke Aktiengesellschaft Motor vehicle with a hydraulic brake system and at least one suspension spring whose base is hydraulically displaceable
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DE102015014205A1 (en) 2015-11-04 2017-05-04 Wabco Gmbh Hydraulic brake system
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EP3428023A1 (en) 2017-07-11 2019-01-16 WABCO GmbH Hydraulic braking system and method for abs control
DE102017007409A1 (en) 2017-07-11 2019-01-17 Wabco Gmbh Hydraulic power brake system and method for ABS control
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US6478384B2 (en) 1998-12-23 2002-11-12 Wabco Gmbh Hydraulic braking system
DE19859737A1 (en) * 1998-12-23 2000-06-29 Wabco Gmbh & Co Ohg Hydraulic brake system
DE102013212135A1 (en) * 2013-06-25 2015-01-08 Bayerische Motoren Werke Aktiengesellschaft Motor vehicle with a hydraulic brake system and at least one suspension spring whose base is hydraulically displaceable
US10086812B2 (en) 2015-03-10 2018-10-02 Wabco Gmbh Hydraulic braking system
DE102015003201A1 (en) 2015-03-10 2016-09-15 Wabco Gmbh Hydraulic brake system
WO2016142028A1 (en) 2015-03-10 2016-09-15 Wabco Gmbh Hydraulic braking system
DE102015014205A1 (en) 2015-11-04 2017-05-04 Wabco Gmbh Hydraulic brake system
US10543819B2 (en) 2015-11-04 2020-01-28 Wabco Gmbh Hydraulic braking system
WO2017088959A1 (en) * 2015-11-28 2017-06-01 Wabco Gmbh Hydraulic brake system
DE102015015472A1 (en) 2015-11-28 2017-06-01 Wabco Gmbh Hydraulic brake system
US10829100B2 (en) 2015-11-28 2020-11-10 Wabco Gmbh Hydraulic brake system
EP3428023A1 (en) 2017-07-11 2019-01-16 WABCO GmbH Hydraulic braking system and method for abs control
DE102017007409A1 (en) 2017-07-11 2019-01-17 Wabco Gmbh Hydraulic power brake system and method for ABS control
US10744982B2 (en) 2017-07-11 2020-08-18 Wabco Gmbh Hydraulic power brake system and method for abs control
US11554626B2 (en) 2019-08-22 2023-01-17 Hyundai Mobis Co., Ltd. Apparatus and method for adjusting height of vehicle

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EP0862526A1 (en) 1998-09-09
WO1997021574A1 (en) 1997-06-19

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