WO1997010133A1 - Hydraulic braking system for motor vehicles - Google Patents

Hydraulic braking system for motor vehicles Download PDF

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Publication number
WO1997010133A1
WO1997010133A1 PCT/EP1996/004008 EP9604008W WO9710133A1 WO 1997010133 A1 WO1997010133 A1 WO 1997010133A1 EP 9604008 W EP9604008 W EP 9604008W WO 9710133 A1 WO9710133 A1 WO 9710133A1
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WO
WIPO (PCT)
Prior art keywords
pressure
wheel brakes
brake system
valve
hydraulic
Prior art date
Application number
PCT/EP1996/004008
Other languages
German (de)
French (fr)
Inventor
Helmut Steffes
Original Assignee
Itt Automotive Europe 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 filed Critical Itt Automotive Europe Gmbh
Publication of WO1997010133A1 publication Critical patent/WO1997010133A1/en

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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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/404—Control of the pump unit
    • B60T8/4054—Control of the pump unit involving the delivery pressure control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • 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

Definitions

  • the invention relates to a hydraulic brake system for motor vehicles with a master brake cylinder, a pressure source, wheel brakes which can be connected to the master brake cylinder as well as with the pressure source via hydraulic lines which can be shut off by means of valve devices, and with a pressure sensor which detects the pressure controlled in the master brake cylinder by the driver of the vehicle .
  • Such a brake system is such. B. from DE-OS 31 24 755 known.
  • the valve devices mentioned above are designed as multi-position valves, preferably electrically operable 4/4-way valves, which are controlled analogously in order to fulfill all the desired functions.
  • each wheel brake is assigned a pressure sensor, the output signal of which is compared in control electronics with the output signal of a second pressure sensor that detects the pressure set in the master brake cylinder by the driver.
  • a disadvantage of the known brake system is the relatively complex control of the multi-position valves, which can only be achieved using complex software. Another disadvantage is seen in the use of the pressure sensors assigned to the wheel brakes with every static braking.
  • valve devices are designed as digitally switchable 2/2-way valves and that a pressure sequence valve is inserted in the line leading from the pressure source to the wheel brakes, which can be switched by the pressure applied in the master brake cylinder.
  • the brake system according to the invention shown in the drawing has two brake circuits I and II, the structure of which is completely identical, so that the following description of one brake circuit also applies to the other.
  • the brake system shown essentially consists of a master brake cylinder which can be actuated by means of a brake pedal 2, preferably a tandem master cylinder 1, a hydraulic pressure source 16, wheel brakes 12, 13 and an electronic control unit (not shown).
  • the assignment of the wheel brakes 12, 13 to the individual brake circuits I and II is made, for example, in such a way that the first pair of wheel brakes 12, 13 shown is assigned to a vehicle axle and the other pair of wheel brakes, not shown, is assigned to the other vehicle axle (black and white division of the brake circuits) . However, a diagonal division is also conceivable.
  • the Pressure chambers (not shown) of the tandem master cylinder 1 are connected to an unpressurized pressure medium reservoir 3.
  • an electromagnetically actuated 2/2-way valve 5 is inserted, which is preferably designed as a normally open (SO) valve, with the aid of which the line 4 can be locked.
  • SO normally open
  • a second electromagnetically actuated, normally open 2/2-way valve 11 is inserted, which regulates the wheel in the wheel brakes 12,
  • a second hydraulic line 22 connects the previously mentioned hydraulic pressure source 16 to the wheel brakes 12, 13.
  • the pressure source 16 consists of a pump 17 driven by an electric motor 18, the suction side of which is connected to the pressure medium reservoir 3, while the wheel brakes 12 are connected to the pressure side on the one hand , 13 and on the other hand a pressure accumulator 19 are connected.
  • the pressure accumulator 19, the pressure of which is monitored by a second pressure sensor 20 and limited by a pressure limiting valve 21, is connected to the pressure medium reservoir 3.
  • a pressure sequence valve 15 is inserted, which can be actuated by the hydraulic pressure applied in the tandem master cylinder 1 and whose task is explained in the text below.
  • a switching valve 24 is connected in parallel to the pressure sequence valve 15, which is an electromagnetically actuated, preferably de-energized closed 2/2-way valve is formed.
  • the switching valve 24 is switched over, a hydraulic connection between the pressure source 16 and the wheel brakes 12, 13 is released, so that this measure enables external braking, which takes place independently of the driver's will.
  • Electromagnetically switchable, preferably normally closed (SG) 2/2-way valves 6, 7 are inserted in the line sections 22a, 22b leading to the individual wheel brakes 12, 13, the switchover of which enables pressure build-up in the wheel brakes 12, 13.
  • electromagnetically switchable, normally closed (SG) 2/2-way valves 8, 9 are provided, which are connected between the wheel brakes 12, 13 and a further hydraulic line 23, which is connected to the pressure medium reservoir 3.
  • tandem master cylinder 1 When the tandem master cylinder 1 is actuated by the driver, the otherwise open first 2/2-way valve 5 is switched over so that the wheel brakes 12, 13 are separated from the tandem master cylinder 1.
  • the pressure value desired by the driver is reported by the pressure sensor 14 to the control electronics (not shown), the control signal of which

Abstract

The invention relates to a braking system for motor vehicles, with a master cylinder, a pressure source, wheel brakes which can be connected by way of hydraulic lines, closeable using valve means, to the master cylinder and the pressure source, and also with a pressure sensor detecting the pressure induced in the master cylinder by the motor vehicle driver. To reduce the costs associated with the production of this braking system, provision is made according to the invention for the valve means to be in the form of digitally switchable 2/2-way valves (5, 6, 7) and for a pressure sequence valve (15), switchable by pressure induced in the master cylinder (1), to be inserted in the line (22) extending from the pressure source (16) to the wheel brakes (12, 13).

Description

Hydraulische Bremsanlage fur KraftfanrzeugeHydraulic brake system for motor vehicles
Die Erfindung betrifft eine hydraulische Bremsanlage fur Kraftfahrzeuge mit einem Hauptbremszylinder, einer Druckquelle, Radbremsen, die über mittels Ventileinrichtungen absperrbare hydraulische Leitungen sowohl mit dem Hauptbremszylinder als auch mit der Druckquelle verbindbar sind, sowie mit einem den im Hauptbremszylinder vom Fahrer des Fahrzeuges eingesteuerten Druck erfassenden Drucksensor.The invention relates to a hydraulic brake system for motor vehicles with a master brake cylinder, a pressure source, wheel brakes which can be connected to the master brake cylinder as well as with the pressure source via hydraulic lines which can be shut off by means of valve devices, and with a pressure sensor which detects the pressure controlled in the master brake cylinder by the driver of the vehicle .
Eine derartige Bremsanlage ist z. B. aus der DE - OS 31 24 755 bekannt. Bei der vorbekannten Bremsanlage sind die vorhin erwähnten Ventileinrichtungen als Mehrstellungs- ventile, vorzugsweise elektrisch betatigbare 4/4-Wegeventιle ausgeführt, die analog angesteuert werden, um sämtliche gewünschten Funktionen zu erfüllen. Außerdem ist jeder Radbremse ein Drucksensor zugeordnet, dessen Ausgangssignal in einer Steuerelektronik mit dem Ausgangssignal eines den im Hauptbremszylinder durcn den Fahrer eingestellten Druck erfassenden zweiten Drucksensors verglichen wird.Such a brake system is such. B. from DE-OS 31 24 755 known. In the known brake system, the valve devices mentioned above are designed as multi-position valves, preferably electrically operable 4/4-way valves, which are controlled analogously in order to fulfill all the desired functions. In addition, each wheel brake is assigned a pressure sensor, the output signal of which is compared in control electronics with the output signal of a second pressure sensor that detects the pressure set in the master brake cylinder by the driver.
Als nachteilig ist bei der vorbekannten Bremsanlage die verhältnismäßig aufwendige Ansteuerung der Mehrstellungs- ventile anzusehen, die nur unter Verwendung einer komplexen Software realisierbar ist. Ein weiterer Nachteil wird in dem Einsatz der den Radbremsen zugeordneten Drucksensoren bei jeder statischen Bremsung gesehen.A disadvantage of the known brake system is the relatively complex control of the multi-position valves, which can only be achieved using complex software. Another disadvantage is seen in the use of the pressure sensors assigned to the wheel brakes with every static braking.
ORIGINALUNTERLAGEN Es ist daher Aufgabe der vorliegenden Erfindung, Maßnahmen vorzuschlagen, die eine Vereinfachung der Bremsanlage der eingangs genannten Gattung zu ermöglichen.ORIGINAL DOCUMENTS It is therefore the object of the present invention to propose measures which make it possible to simplify the brake system of the type mentioned at the outset.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Ventileinrichtungen als digital schaltbare 2/2-Wegeventile ausgebildet sind und daß in der von der Druckquelle zu den Radbremsen führenden Leitung ein Druckfolgeventil eingefügt ist, das durch den im Hauptbremszylinder eingesteuerten Druck schaltbar ist.This object is achieved in that the valve devices are designed as digitally switchable 2/2-way valves and that a pressure sequence valve is inserted in the line leading from the pressure source to the wheel brakes, which can be switched by the pressure applied in the master brake cylinder.
Vorteilhafte Weiterbildungen des Erfindungsgegenstandes sind den Unteransprüchen 2 bis 8 zu entnehmen.Advantageous developments of the subject matter of the invention can be found in subclaims 2 to 8.
Die Erfindung wird in der nachfolgenden Beschreibung an einem Ausführungsbeispiel im Zusammenhang mit der beiliegen¬ den Zeichnung näher erläutert, wobei die einzige Figur ein hydraulisches Schaltbild der erfindungsgemäßen Bremsanlage zeigt.The invention is explained in more detail in the following description using an exemplary embodiment in conjunction with the enclosed drawing, the single figure showing a hydraulic circuit diagram of the brake system according to the invention.
Die in der Zeichnung dargestellte erfindungsgemäße Bremsan¬ lage weist zwei Bremskreise I und II auf, deren Aufbau völlig identisch ist, so daß die folgende Beschreibung eines Bremskreises ebenso auf den anderen zutrifft. Die gezeigt Bremsanlage besteht im wesentlichen aus einem mittels eines Bremspedals 2 betätigbaren Hauptbremszylinder, vorzugsweise einem Tandemhauptzylinder 1, einer hydraulischen Druckquelle 16, Radbremsen 12, 13 sowie einer nicht gezeigten elektronischen Steuereinheit. Die Zuordnung der Radbremsen 12, 13 den einzelnen Bremskreisen I und II ist beispielsweise derart getroffen, daß das erste, gezeigte Radbremsenpaar 12, 13 einer Fahrzeugachse und das andere, nicht gezeigte Radbremspaar der anderen Fahrzeugachse zugeordnet ist (Schwarz-Weiß-Aufteilung der Bremskreise). Denkbar ist allerdings auch eine diagonale Aufteilung. Die nicht dargestellten Druckräume des Tandemhauptzylinders 1 stehen in Verbindung mit einem drucklosen Druckmittelvorratsbehälter 3.The brake system according to the invention shown in the drawing has two brake circuits I and II, the structure of which is completely identical, so that the following description of one brake circuit also applies to the other. The brake system shown essentially consists of a master brake cylinder which can be actuated by means of a brake pedal 2, preferably a tandem master cylinder 1, a hydraulic pressure source 16, wheel brakes 12, 13 and an electronic control unit (not shown). The assignment of the wheel brakes 12, 13 to the individual brake circuits I and II is made, for example, in such a way that the first pair of wheel brakes 12, 13 shown is assigned to a vehicle axle and the other pair of wheel brakes, not shown, is assigned to the other vehicle axle (black and white division of the brake circuits) . However, a diagonal division is also conceivable. The Pressure chambers (not shown) of the tandem master cylinder 1 are connected to an unpressurized pressure medium reservoir 3.
In einer ersten hydraulischen Leitung 4, die den ersten Bremskreis I mit den Radbremsen 12, 13 verbindet, ist ein elektromagnetisch betätigbares 2/2-Wegeventil 5 eingefügt, das vorzugsweise als ein stromlos offenes (SO) Ventil ausgeführt ist, mit dessen Hilfe die Leitung 4 absperrbar ist. In einem die beiden Radbremsen 12, 13 verbindenden Leitungsabschnitt 10 ist ein zweites elektromagnetisch betätigbares, stromlos offenes 2/2-Wegeventil 11 eigefügt, das eine radindividuelle Regelung des in den Radbremsen 12,In a first hydraulic line 4, which connects the first brake circuit I to the wheel brakes 12, 13, an electromagnetically actuated 2/2-way valve 5 is inserted, which is preferably designed as a normally open (SO) valve, with the aid of which the line 4 can be locked. In a line section 10 connecting the two wheel brakes 12, 13, a second electromagnetically actuated, normally open 2/2-way valve 11 is inserted, which regulates the wheel in the wheel brakes 12,
13 eingesteuerten Druckes ermöglicht. Der im Tandemhauptzylinder 1 eingesteuerte hydraulische Druck wird mittels eines an die Leitung 4 angeschlossenen Drucksensors13 controlled pressure allows. The hydraulic pressure applied in the tandem master cylinder 1 is controlled by means of a pressure sensor connected to the line 4
14 sensiert.14 senses.
Eine zweite hydraulische Leitung 22 verbindet die vorhin erwähnte hydraulische Druckquelle 16 mit den Radbremsen 12, 13. Die Druckquelle 16 besteht aus einer durch einen Elektromotor 18 angetriebenen Pumpe 17, deren Saugseite mit dem Druckmittelvorratsbehälter 3 verbunden ist, während an ihre Druckseite einerseits die Radbremsen 12, 13 und andererseits ein Druckspeicher 19 angeschlossen sind. Der Druckspeicher 19, dessen Druck mittels eines zweiten Drucksensors 20 überwacht und durch ein Druckbegrenzungs¬ ventil 21 begrenzt wird, steht mit dem Druckmittelvorrats¬ behälter 3 in Verbindung. In der zu den Radbremsen 12, 13 führenden Leitung 22 ist ein Druckfolgeventil 15 eingefügt, das durch den im Tandemhauptzylinder 1 eingesteuerten hydraulischen Druck betätigbar ist und dessen Aufgabe im nachfolgenden Text erläutert wird. Parallel zum Druckfolge¬ ventil 15 ist ein Schaltventil 24 geschaltet, das als elektromagnetisch betätigbares, vorzugsweise stromlos geschlossenes 2/2-Wegeventil ausgebildet ist. Beim Umschalten des Schaltventils 24 wird eine hydraulische Verbindung zwischen der Druckquelle 16 und den Radbremsen 12, 13 freigegeben, so daß durch diese Maßnahme Fremdbremsungen ermöglicht werden, die unabhängig vom Fahrerwillen erfolgen. In den zu den einzelnen Radbremsen 12, 13 führenden Leitungsabschnitten 22a, 22b sind elektromagnetisch schaltbare, vorzugsweise stromlos geschlossene (SG) 2/2-Wegeventile 6, 7 eingefügt, deren Umschalten einen Druckaufbau in den Radbremsen 12, 13 ermöglicht. Um den in den Radbremsen 12, 13 herrschenden Druck wieder abbauen zu können sind schließlich elektromagetisch schaltbare, stromlos geschlossene (SG) 2/2- Wegeventile 8, 9 vorgesehen, die zwischen den Radbremsen 12, 13 und einer weiteren hydraulischen Leitung 23 geschaltet sind, die an den Druckmittelvorratsbehälter 3 angeschlossen ist.A second hydraulic line 22 connects the previously mentioned hydraulic pressure source 16 to the wheel brakes 12, 13. The pressure source 16 consists of a pump 17 driven by an electric motor 18, the suction side of which is connected to the pressure medium reservoir 3, while the wheel brakes 12 are connected to the pressure side on the one hand , 13 and on the other hand a pressure accumulator 19 are connected. The pressure accumulator 19, the pressure of which is monitored by a second pressure sensor 20 and limited by a pressure limiting valve 21, is connected to the pressure medium reservoir 3. In the line 22 leading to the wheel brakes 12, 13, a pressure sequence valve 15 is inserted, which can be actuated by the hydraulic pressure applied in the tandem master cylinder 1 and whose task is explained in the text below. A switching valve 24 is connected in parallel to the pressure sequence valve 15, which is an electromagnetically actuated, preferably de-energized closed 2/2-way valve is formed. When the switching valve 24 is switched over, a hydraulic connection between the pressure source 16 and the wheel brakes 12, 13 is released, so that this measure enables external braking, which takes place independently of the driver's will. Electromagnetically switchable, preferably normally closed (SG) 2/2-way valves 6, 7 are inserted in the line sections 22a, 22b leading to the individual wheel brakes 12, 13, the switchover of which enables pressure build-up in the wheel brakes 12, 13. Finally, in order to be able to reduce the pressure prevailing in the wheel brakes 12, 13, electromagnetically switchable, normally closed (SG) 2/2-way valves 8, 9 are provided, which are connected between the wheel brakes 12, 13 and a further hydraulic line 23, which is connected to the pressure medium reservoir 3.
Bei einer Betätigung des Tandemhauptzylinders 1 durch den Fahrer wird das sonst offene erste 2/2-Wegeventil 5 umgeschaltet, so daß die Radbremsen 12, 13 vom Tandemhauptzylinder 1 getrennt werden. Der vom Fahrer gewünschte Druckwert wird vom Drucksensor 14 der nicht gezeigten Steuerelektronik gemeldet, deren Steuersignal das When the tandem master cylinder 1 is actuated by the driver, the otherwise open first 2/2-way valve 5 is switched over so that the wheel brakes 12, 13 are separated from the tandem master cylinder 1. The pressure value desired by the driver is reported by the pressure sensor 14 to the control electronics (not shown), the control signal of which
Motor-Pumpen-Aggregat 17,18 ansteuert, das bei gleichzeitigem Öffnen des Druckfolgeventils 15 durch die Wirkung des im Hauptzylinder 1 eingesteuerten Druckes sowie der (SG) 2/2-Wegeventile 6, 7 einen Druckaufbau in den Radbremsen 12, 13 bewirkt. Erreicht der vom Motor-Pumpen- Aggregat 17, 18 erzeugte Druck den vom Fahrer gewünschten Druckwert, so wird das Druckfolgeventil 15 geschlossen. Ein Abbau des in den Radbremsen 12, 13 eingesteuerten hydraulischen Druckes erfolgt (bei bereits geschlossenen 2/2-Wegeventilen 6, 7) durch Umschalten der stromlos geschlossenen 2/2-Wegeventile 8, 9, die in ihrer offenen Schaltstellung eine Verbindung zwischen den Radbremsen 12, 13 und dem drucklosen Druckmittelvorratsbehälter 3 herstellen. Drives motor-pump unit 17, 18 which, when the pressure sequence valve 15 is opened at the same time, causes a pressure build-up in the wheel brakes 12, 13 by the action of the pressure applied in the master cylinder 1 and the (SG) 2/2-way valves 6, 7. If the pressure generated by the motor-pump unit 17, 18 reaches the pressure value desired by the driver, the pressure sequence valve 15 is closed. The hydraulic pressure applied in the wheel brakes 12, 13 is reduced (when the 2/2-way valves 6, 7 are already closed) by switching over the normally closed 2/2-way valves 8, 9, which in their open switching position provide a connection between the wheel brakes 12, 13 and the pressureless pressure medium reservoir 3.

Claims

Patentansprüche claims
1. Hydraulische Bremsanlage für Kraftfahrzeuge mit einem Hauptbremszylinder, einer Druckquelle, Radbremsen, die über mittels Ventileinrichtungen absperrbare hydraulische Leitungen sowohl mit dem Hauptbremszylinder als auch mit der Druckquelle verbindbar sind, sowie mit einem den im Hauptbremszylinder vom Fahrer des Fahrzeuges eingesteuerten Druck erfassenden Drucksensor, dadurch gekennzeichnet, daß die Ventileinrichtungen als digital schaltbare 2/2-Wegeventile (5,6,7) ausgebildet sind und daß in der von der Druckquelle (16) zu den Radbremsen1.Hydraulic brake system for motor vehicles with a master brake cylinder, a pressure source, wheel brakes which can be connected both to the master brake cylinder and to the pressure source via hydraulic lines which can be shut off by means of valve devices, and to a pressure sensor which detects the pressure entered in the master brake cylinder by the driver of the vehicle, thereby characterized in that the valve devices are designed as digitally switchable 2/2-way valves (5, 6, 7) and in that from the pressure source (16) to the wheel brakes
( 12, 13)führenden Leitung (22) ein Druckfolgeventil(12, 13) leading line (22) a pressure sequence valve
(15) eingefügt ist, das durch den im Hauptbremszylinder (1) eingesteuerten Druck schaltbar ist.(15) is inserted, which can be switched by the pressure applied in the master brake cylinder (1).
2. Hydraulische Bremsanlage nach Anspruch 1 dadurch gekennzeichnet, daß parallel zum Druckfolgeventil (15) ein Schaltventil (24) geschaltet ist, das in einer Schaltstellung eine Verbindung zwischen der Druckquelle2. Hydraulic brake system according to claim 1, characterized in that a switching valve (24) is connected in parallel to the pressure sequence valve (15), which in a switching position a connection between the pressure source
(16) und den Radbremsen (12,13) ermöglicht.(16) and the wheel brakes (12, 13).
3. Hydraulische Bremsanlage nach Anspruch 2 dadurch gekennzeichnet, daß das Schaltventil (24) als ein elektromagnetisch betätigbares, stromlos geschlossenes 2/2-Wegeventil ausgebildet ist. 3. Hydraulic brake system according to claim 2, characterized in that the switching valve (24) is designed as an electromagnetically actuated, normally closed 2/2-way valve.
4. Hydraulische Bremsanlage nach einem der Ansprüche 1 bis 3, wobei dem Hauptbremszylinder ein druckloser Druckmittelvorratsbehälter zugeordnet ist, dadurch gekennzeichnet, daß die Radbremsen (12,13) über eine absperrbare hydraulische Leitung (23) mit dem Druckmittelvorratsbehälter (3) verbunden sind.4. Hydraulic brake system according to one of claims 1 to 3, wherein the master brake cylinder is assigned a pressure-free pressure medium reservoir, characterized in that the wheel brakes (12, 13) are connected via a lockable hydraulic line (23) to the pressure medium reservoir (3).
5. Hydraulische Bremsanlage nach Anspruch 4 dadurch gekennzeichnet, daß die zum Druckmittelvorratsbehälter (3) führende Leitung (23) mittels eines digital schaltbaren 2/2-Wegeventils (8,9) absperrbar ist.5. Hydraulic brake system according to claim 4, characterized in that the pressure medium reservoir (3) leading line (23) by means of a digitally switchable 2/2-way valve (8,9) can be shut off.
6. Hydraulische Bremsanlage nach einem der Ansprüche 1 bis 5 dadurch gekennzeichnet, daß zwischen den einer Fahrzeugachse zugeordneten Radbremsen (12,13) eine absperrbare Leitung (10) vorgesehen ist.6. Hydraulic brake system according to one of claims 1 to 5, characterized in that a lockable line (10) is provided between the wheel brakes assigned to a vehicle axle (12, 13).
7. Hydraulische Bremsanlage nach Anspruch 6 dadurch gekennzeichnet, daß die Leitung (10) mittels eines digital schaltbaren 2/2-Wegeventils (11) absperrbar ist.7. Hydraulic brake system according to claim 6, characterized in that the line (10) by means of a digitally switchable 2/2-way valve (11) can be shut off.
8. Hydraulische Bremsanlage nach einem der vorhergehenden Ansprüche, wobei die Druckquelle durch ein Motor- Pumpenaggregat gebildet ist, dadurch gekennzeichnet, daß die Saugseite der Pumpe (17) an den Druckmittelvorratsbehälter (3) angeschlossen ist. 8. Hydraulic brake system according to one of the preceding claims, wherein the pressure source is formed by a motor-pump unit, characterized in that the suction side of the pump (17) is connected to the pressure medium reservoir (3).
PCT/EP1996/004008 1995-09-15 1996-09-12 Hydraulic braking system for motor vehicles WO1997010133A1 (en)

Applications Claiming Priority (2)

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DE19534221.6 1995-09-15
DE1995134221 DE19534221A1 (en) 1995-09-15 1995-09-15 Hydraulic brake system for motor vehicles

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WO2001068427A1 (en) * 2000-03-15 2001-09-20 Continental Teves Ag & Co. Ohg Electrohydraulic braking system
EP2532560A1 (en) * 2010-02-02 2012-12-12 Toyota Jidosha Kabushiki Kaisha Brake system
EP2647535A4 (en) * 2010-12-01 2015-05-06 Toyota Motor Co Ltd Hydraulic brake system
EP2960125A1 (en) * 2014-06-27 2015-12-30 Robert Bosch Gmbh Braking system

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WO2001068427A1 (en) * 2000-03-15 2001-09-20 Continental Teves Ag & Co. Ohg Electrohydraulic braking system
EP2532560A1 (en) * 2010-02-02 2012-12-12 Toyota Jidosha Kabushiki Kaisha Brake system
EP2532560A4 (en) * 2010-02-02 2014-10-08 Toyota Motor Co Ltd Brake system
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US9315182B2 (en) 2014-06-27 2016-04-19 Robert Bosch Gmbh Braking system

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