WO1997029936A1 - Vehicle brake system with anti-locking means - Google Patents

Vehicle brake system with anti-locking means Download PDF

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Publication number
WO1997029936A1
WO1997029936A1 PCT/DE1996/002038 DE9602038W WO9729936A1 WO 1997029936 A1 WO1997029936 A1 WO 1997029936A1 DE 9602038 W DE9602038 W DE 9602038W WO 9729936 A1 WO9729936 A1 WO 9729936A1
Authority
WO
WIPO (PCT)
Prior art keywords
wheel
brake cylinder
valve
vehicle
brake
Prior art date
Application number
PCT/DE1996/002038
Other languages
German (de)
French (fr)
Inventor
Günther Schmidt
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP96945533A priority Critical patent/EP0820392A1/en
Priority to JP9528867A priority patent/JPH11503987A/en
Publication of WO1997029936A1 publication Critical patent/WO1997029936A1/en

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
    • 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
    • B60T8/26—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels
    • 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
    • B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed 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
    • B60T8/341—Systems characterised by their valves
    • 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
    • B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed systems
    • B60T8/4275—Pump-back systems
    • B60T8/4283—Pump-back systems having a pressure sensitive inlet valve
    • 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
    • B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed systems
    • B60T8/4275—Pump-back systems
    • B60T8/4291—Pump-back systems having means to reduce or eliminate pedal kick-back
    • 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
    • B60T8/50—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 having means for controlling the rate at which pressure is reapplied to or released from the brake
    • B60T8/5018—Pressure reapplication using restrictions
    • B60T8/5025—Pressure reapplication using restrictions in hydraulic brake systems
    • B60T8/5037—Pressure reapplication using restrictions in hydraulic brake systems closed systems

Definitions

  • the invention relates to a preferably hydraulic vehicle brake system with anti-lock control device according to the preamble of the main claim.
  • the known vehicle brake system has a brake circuit to which a wheel brake cylinder of a front wheel and a rear wheel arranged diagonally to the vehicle are connected.
  • the brake circuit is actuated by means of a master brake cylinder.
  • the two wheel brake cylinders have a common 3/3 valve as an inlet and outlet valve. This 3/3 valve could be replaced in a manner known to those skilled in the art by two 2/2 valves, that is to say by a separate inlet valve and outlet valve. If a vehicle wheel tends to lock, brake pressure modulation takes place in a manner known per se by means of the inlet and outlet valve.
  • brake fluid is drained from the wheel brake cylinders through the inlet and outlet valve into a reservoir and can be pumped back into the wheel brake cylinders by means of a return pump for subsequent pressure increases.
  • the known vehicle brake system has the disadvantage that the brake pressure in the connected to the Bremskrei ⁇
  • Wheel brake cylinders can only be modulated together.
  • the vehicle brake system according to the invention with the features of the main claim has the advantage of a simple structure, as a result of which it is inexpensive to manufacture. It has a 2/2 solenoid valve which can be controlled by means of an electronic control unit as an outlet valve of a wheel brake cylinder of each anti-lock controlled vehicle wheel. It also has a second 2/2-way valve that is fluid-operated. For actuation, brake fluid is applied to it from a pressure side of the return pump and separates the wheel brake cylinder connected to the main brake cylinder. This has the advantage that brake fluid pressure fluctuations and pulsations due to brake pressure modulation during the anti-lock control only have a minor effect on the master brake cylinder and thus on a brake pedal.
  • vehicle brake system has only one 2/2 solenoid valve for each anti-lock vehicle wheel and that only one valve per anti-lock vehicle wheel has to be controlled by the electronic control unit.
  • the isolating valve is actuated automatically due to the brake fluid pressure ratio in the vehicle brake system during the anti-lock control system.
  • the return pump does not have to deliver against the brake fluid pressure of the master brake cylinder.
  • the memory dampens brake fluid fluctuations and pulsations during brake pressure modulation and thus counteracts noise. The comfort for a driver is high due to low pedal effects.
  • the subclaims relate to advantageous refinements and developments of the invention specified in the main claim.
  • FIG. 1 shows a brake circuit of a vehicle brake system according to the invention
  • Figure 2 shows a hydraulically operated isolation valve according to the invention in the axial section.
  • the vehicle brake system has a second, correspondingly constructed, independent second brake circuit, which is not shown in the drawing.
  • the vehicle brake system has a two-circuit master brake cylinder 10 for actuating both brake circuits.
  • a wheel brake cylinder 12 of a front vehicle wheel and a wheel brake cylinder 14 of a rear vehicle wheel are connected to the brake circuit shown.
  • two vehicle wheels arranged diagonally on the vehicle are braked by means of a brake circuit.
  • a hydraulically actuated isolation valve 16, 18 is arranged between the master brake cylinder 10 and each wheel brake cylinder 12, 14.
  • the isolating valves 16, 18 are open in their basic position.
  • One check valve 20, 22 opening in the direction of the master brake cylinder 10 is connected in parallel.
  • Each wheel brake cylinder 12, 14 has a closed 2/2 solenoid valve 24, 26 in its basic position as an outlet valve. Via the outlet valves 24, 26, the two wheel brake cylinders 12, 14 are connected to a common accumulator 28 and to a suction side of a return pump 30 which can be driven by an electric pump motor 32.
  • a pressure side of the return pump 30 is connected to the wheel brake cylinder 12 of the front vehicle wheel via a differential pressure valve 34 and a throttle 36 connected in series.
  • the pressure side of the return pump 30 is connected to the wheel brake cylinder 14 of the rear vehicle wheel by a second throttle 38 and a check valve 40 opening in the direction of the wheel brake cylinder 14.
  • a control line 42 for actuating the hydraulically actuated isolating valves 16, 18 is connected to the pressure side of the return pump 30. Brake fluid from the pressure side of the return pump 30 actuates the isolating valves 16, 18 in the direction of their closed switching position. Furthermore, the isolating valves 16, 18 have a control connection 44 connected to the master brake cylinder 10 and a return spring element 46 which hold the isolating valve 16, 18 in the open basic position or actuate it in the direction of this basic position.
  • the isolating valves 16, 18 thus have a differential pressure control circuit 42, 44 which closes the isolating valve 16, 18 when the brake fluid pressure on the pressure side of the return pump 30 exceeds the brake fluid pressure of the master brake cylinder 10 by a value corresponding to the force of the return spring element 46.
  • the return pump 30 is connected in parallel with a throttle 48, which is not necessary in every case, but has an advantage to be described.
  • Each vehicle wheel has a wheel rotation sensor 50, 52, the signals of which are fed to an electronic control unit 54, which actuates the solenoid outlet valves 24, 26 and switches the pump motor 32 on and off.
  • a risk of the vehicle wheel locking ie an impermissibly rapidly decreasing wheel speed, is established by the electronic control unit 54 by means of the wheel rotation sensors 50, 52.
  • E ⁇ opens the outlet valve 24, 26 assigned to this vehicle wheel, so that brake fluid flows out of the corresponding wheel brake cylinder 12, 14 into the reservoir 28. The braking force of this vehicle wheel is thus reduced and blocking is prevented.
  • the pump motor 32 is switched on with a time delay after the risk of wheel lock occurs, and the return pump 30 is thus started. As soon as the brake fluid pressure on the pressure side of the return pump 30 exceeds the brake fluid pressure of the master brake cylinder 10 by a value specified by the return spring elements 46 of the isolating valves 16, 18, the isolating valves 16, 18 close.
  • the pressure difference at which the isolating valves 16, 18 close can be different for both isolating valves 16, 18, it is designed to be vehicle-specific.
  • the master brake cylinder 10 is separated from the wheel brake cylinders 12, 14 by closing the isolating valves 16, 18 and pedal reactions prevented or at least kept small during the anti-lock control.
  • the throttles 36, 38 between the pressure side of the return pump 30 and the wheel brake cylinders 12, 14 throttle the brake fluid flow from the return pump 30 to the Q wheel brake cylinders 12, 14 and thereby keep the pressure on the pressure side of the return pump 30 high. As a result, the isolation valves 16, 18 are kept closed during the anti-lock control.
  • 35 ⁇ protection control are braked more, which means a shorter braking distance when the vehicle is loaded.
  • the brake fluid pressure must be in the Wheel brake cylinders 12, 14 are increased in order to brake the vehicle wheels so strongly that they tend to lock and the maximum possible braking force acts.
  • the electronic control unit 54 detects the change in the road friction value on the basis of the signals from the wheel rotation sensors 50, 52. In order to increase the brake fluid pressure in the wheel brake cylinders 12, 14, the one assigned to the vehicle front wheel is assigned
  • the pump motor 32 is switched off.
  • the time period is dependent on the vehicle and / or is determined taking into account further variables of the vehicle brake system, such as temperature or viscosity of the brake fluid.
  • the brake fluid pressure on the pressure side of the return pump 30 is rapidly reduced by the throttle 38, the check valve 40 and the open outlet valve 26 of the rear wheel brake cylinder 14 in the accumulator 28.
  • the isolating valves 16, 18 open brake fluid passes from the master brake cylinder 10 to the wheel brake cylinders 12, 14.
  • the brake fluid pressure in the wheel brake cylinders 12, 14 is increased and the anti-lock control can begin again.
  • the throttle 48 which is connected in parallel with the return pump 30, has the purpose that the brake fluid pressure on the pressure side of the return pump 30, after its shutdown, is faster against the delivery direction of the return pump 30 can degrade in the memory 28.
  • the time until the isolation valves 16, 18 open is shortened and the
  • Brake fluid pressure in the wheel brake cylinders 12, 14 can be increased earlier.
  • the throttle 48 does not have to be present, but brings the advantage described above.
  • FIG. 2 shows a isolating valve 16, 18 of the vehicle brake system shown in FIG. 1. It is designed as a cartridge with a valve housing 54, which is provided for insertion into a stepped bore 56 of a hydraulic block 58. The remaining valves 24, 26, 34, the accumulator 28 and the return pump 30 are also included in the hydraulic block 58, which is only shown in part.
  • the valve housing 54 is complementary to the stepped bore 56, and each step is sealed against the hydraulic block 58 by means of a sealing ring 62.
  • a valve piston 64 is received in the valve housing 54.
  • the valve piston 64 has a ball as the valve closing body 66.
  • a helical compression spring 68 presses the valve piston 64 and with it the valve body 66 from a valve seat.
  • the isolating valve 16, 18 is therefore open in its basic position.
  • a radial bore 72 is made in the valve housing 54, which opens on a side of the valve piston 64 facing away from the valve seat. This radial bore 72 communicates with the pressure side of the return pump 30 via a brake fluid channel 74 in the hydraulic block 58.
  • Another brake fluid channel 76 which is connected to the master brake cylinder 10, communicates through a radial bore 78 in the valve housing 54 with a side of the valve piston 64 facing the valve seat 70. E ⁇ thus a differential pressure control of the isolating valve 16, 18 is achieved: exceeds the pressure on the Valve seat 70 facing away Side of the valve piston 64 (ie on the pressure side of the return pump 30) the pressure prevailing
  • Helical compression spring 68 corresponding value, the isolating valve 16, 18 is closed.
  • a valve outlet 80 takes place axially through the valve seat 70.
  • the valve outlet 80 communicates with the wheel brake cylinder 12, 14.

Abstract

The invention relates to a vehicle brake system with anti-locking means with a master cylinder (10), at least one wheel brake cylinder (12, 14), an electromagnetic outlet valve (24, 26) for the wheel brake cylinder (12, 14), a reservoir (28) and a return pump (30). For the structure of the vehicle brake system to be simple, the invention proposes to arrange a separation valve (16, 18), actuated hydraulically from a delivery side of the return pump (30) and open in its starting position, between the master cylinder (10) and the wheel brake cylinder (12, 14). The invention can be embodied so that anti-locking control can be used on individual wheels.

Description

Fahrzeugbremsanlage mit Blockierschutzregeleinrichtung Vehicle brake system with anti-lock control device
Stand der TechnikState of the art
Die Erfindung betrifft eine vorzugsweise hydraulische Fahrzeugbremsanlage mit Blockierschutzregeleinrichtung nach der Gattung des Hauptanspruchs.The invention relates to a preferably hydraulic vehicle brake system with anti-lock control device according to the preamble of the main claim.
'Eine derartige Fahrzeugbremsanlage ist bekannt aus der DE 35 42 689 C2. Die bekannte Fahrzeugbremsanlage weist einen Bremskreis auf, an den ein Radbremszylinder eines Vorderrades und eines dazu diagonal am Fahrzeug angeordneten Hinterrades angeschlossen sind. Betätigt wird der Bremskreis mittelε eines Hauptbremszylinders. Die beiden Radbremszylinder haben ein gemeinsames 3/3-Ventil als Ein- und Auslaßventil. Dieses 3/3-Ventil könnte in für den Fachmann an εich bekannter Weise durch zwei 2/2-Ventile, alεo durch ein getrenntes Einla߬ ventil und Auslaßventil ersetzt werden. Bei Blockierneigung eines Fahrzeugrades erfolgt eine Bremsdruckmodulation in an sich bekannter Weise mittels des Ein- und Auεlaßventilε. Zum Druckabsenken wird Bremsflüssigkeit aus den RadbremsZylindern durch das Ein- und Auslaßventil in einen Speicher abgelassen und kann zum anschließenden Druckerhöhen mittels einer Rückförderpumpe wieder in die Radbremszylinder gefördert werden. Die bekannte Fahrzeugbremsanlage hat den Nachteil, daß der Bremsdruck in den an den Bremskreiε angeschlossenen 'Such a vehicle braking system is known from DE 35 42 689 C2. The known vehicle brake system has a brake circuit to which a wheel brake cylinder of a front wheel and a rear wheel arranged diagonally to the vehicle are connected. The brake circuit is actuated by means of a master brake cylinder. The two wheel brake cylinders have a common 3/3 valve as an inlet and outlet valve. This 3/3 valve could be replaced in a manner known to those skilled in the art by two 2/2 valves, that is to say by a separate inlet valve and outlet valve. If a vehicle wheel tends to lock, brake pressure modulation takes place in a manner known per se by means of the inlet and outlet valve. To reduce the pressure, brake fluid is drained from the wheel brake cylinders through the inlet and outlet valve into a reservoir and can be pumped back into the wheel brake cylinders by means of a return pump for subsequent pressure increases. The known vehicle brake system has the disadvantage that the brake pressure in the connected to the Bremskreiε
Radbremszylindern nur gemeinsam moduliert werden kann.Wheel brake cylinders can only be modulated together.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Fahrzeugbremεanlage mit den Merkmalen des Hauptanspruchs hat den Vorteil eines einfachen Aufbaus, es ist infolgedessen preisgünstig herstellbar. Es weist ein mittels eines elektronischen Steuergeräts steuerbares 2/2- Magnetventil als Auεlaßventil eines Radbremszylinders jedes blockierschutzgeregelten Fahrezeugrades auf. Sie weist darüberhinaus ein zweites 2/2-Trennventil auf, das fluidbetätigt ist. Zur Betätigung wird es mit Bremsfluid von einer Druckseite der Rückförderpumpe beaufschlagt und trennt den an eε angeschlossenen Radbremszylinder vom Hauptbrems¬ zylinder. Dies hat den Vorteil, daß Bremsfluiddruck- schwankungen und -pulsationen infolge Bremsdruckmodulation während der Blockierschutzregelung nur gering auf den Hauptbremszylinder und damit auf ein Bremspedal zurückwirken. Weiterer Vorteil der erfindungsgemäßen Fahrzeugbremsanlage iεt, daß εie nur ein 2/2-Magnetventil für jedes blockierschutzgeregelte Fahrzeugrad aufweist, und daß nur dieses eine Ventil pro blockierschutzgeregeltem Fahrzeugrad von dem elektronischen Steuergerät gesteuert werden muß. Das Trennventil wird selbstεtändig aufgrund der Bremsfluiddruck- verhältnisεe in der Fahrzeugbremεanlage während der Blockierεchutzregelung betätigt. Weiterer Vorteil der Erfindung iεt, daß die Rückförderpumpe nicht gegen den Bremsfluiddruck des Hauptbremszylinders fördern muß. Der Speicher dämpft Bremsfluidschwankungen und- pulεationen während der Bremsdruckmodulation und wirkt dadurch einer Geräuschbildung entgegen. Der Komfort für einen Fahrer ist infolge geringer Pedalrückwirkungen hoch. Die Unteransprüche haben vorteilhafte Ausgeεtaltungen und Weiterbildungen der im Hauptanspruch angegebenen Erfindung zum Gegenstand.The vehicle brake system according to the invention with the features of the main claim has the advantage of a simple structure, as a result of which it is inexpensive to manufacture. It has a 2/2 solenoid valve which can be controlled by means of an electronic control unit as an outlet valve of a wheel brake cylinder of each anti-lock controlled vehicle wheel. It also has a second 2/2-way valve that is fluid-operated. For actuation, brake fluid is applied to it from a pressure side of the return pump and separates the wheel brake cylinder connected to the main brake cylinder. This has the advantage that brake fluid pressure fluctuations and pulsations due to brake pressure modulation during the anti-lock control only have a minor effect on the master brake cylinder and thus on a brake pedal. Another advantage of the vehicle brake system according to the invention is that it has only one 2/2 solenoid valve for each anti-lock vehicle wheel and that only one valve per anti-lock vehicle wheel has to be controlled by the electronic control unit. The isolating valve is actuated automatically due to the brake fluid pressure ratio in the vehicle brake system during the anti-lock control system. Another advantage of the invention is that the return pump does not have to deliver against the brake fluid pressure of the master brake cylinder. The memory dampens brake fluid fluctuations and pulsations during brake pressure modulation and thus counteracts noise. The comfort for a driver is high due to low pedal effects. The subclaims relate to advantageous refinements and developments of the invention specified in the main claim.
Zeichnungdrawing
Die Erfindung wird nachfolgend anhand eines in der Zeichnung dargestellten Ausführungsbeispiels näher erläutert. Es zeigen:The invention is explained in more detail below with reference to an embodiment shown in the drawing. Show it:
Figur 1 einen Bremskreis einer erfindungsgemäßen Fahrzeugbremsanlage und1 shows a brake circuit of a vehicle brake system according to the invention and
Figur 2 ein hydraulisch betätigtes Trennventil gemäß der Erfindung im Achsεchnitt.Figure 2 shows a hydraulically operated isolation valve according to the invention in the axial section.
Beschreibung deε AuεführungsbeispielεDescription of the exemplary embodiment
In Figur 1 iεt ein Bremskreis einer erfindungsgemäßen, hydraulischen Fahrzeugbremsanlage dargestellt. Die Fahrzeugbremsanlage weist einen zweiten, übereinstimmend aufgebauten, unabhängigen zweiten Bremskreis auf, der in der Zeichnung nicht dargestellt ist. Zur Betätigung beider Bremskreiεe weiεt die Fahrzeugbremsanlage einen Zweikreis- Hauptbremszylinder 10 auf.1 shows a brake circuit of a hydraulic vehicle brake system according to the invention. The vehicle brake system has a second, correspondingly constructed, independent second brake circuit, which is not shown in the drawing. The vehicle brake system has a two-circuit master brake cylinder 10 for actuating both brake circuits.
An den dargestellten Bremskreis ist ein Radbremszylinder 12 eines vorderen Fahrzeugrades und ein Radbremszylinder 14 eines hinteren Fahrzeugrades angeschloεεen. Vorzugsweise werden zwei diagonal am Fahrzeug angeordnete Fahrzeugräder mittelε eines Bremskreises gebremst. Zwischen dem Haupt¬ bremszylinder 10 und jedem Radbremszylinder 12, 14 ist ein hydraulisch betätigbares Trennventil 16, 18 angeordnet. Die Trennventile 16, 18 sind ihrer Grundstellung offen. Ihnen ist je ein in Richtung des Hauptbremszylinderε 10 öffnendeε Rückschlagventil 20, 22 parallel geschaltet. Jeder Radbremszylinder 12, 14 weist ein in seiner Grundstellung geschloεsenes 2/2-Magnetventil 24, 26 als Auslaßventil auf. Über die Auslaßventile 24, 26 sind die beiden Radbremszylinder 12, 14 an einen gemeinsamen Speicher 28 sowie an eine Saugεeite einer Rückförderpumpe 30 angeεchlossen, die mit einem elektrischen Pumpenmotor 32 antreibbar ist.A wheel brake cylinder 12 of a front vehicle wheel and a wheel brake cylinder 14 of a rear vehicle wheel are connected to the brake circuit shown. Preferably, two vehicle wheels arranged diagonally on the vehicle are braked by means of a brake circuit. A hydraulically actuated isolation valve 16, 18 is arranged between the master brake cylinder 10 and each wheel brake cylinder 12, 14. The isolating valves 16, 18 are open in their basic position. One check valve 20, 22 opening in the direction of the master brake cylinder 10 is connected in parallel. Each wheel brake cylinder 12, 14 has a closed 2/2 solenoid valve 24, 26 in its basic position as an outlet valve. Via the outlet valves 24, 26, the two wheel brake cylinders 12, 14 are connected to a common accumulator 28 and to a suction side of a return pump 30 which can be driven by an electric pump motor 32.
Eine Druckseite der Rückförderpumpe 30 ist über ein Differenzdruckventil 34 und eine in Serie geschaltete Drosεel 36 mit dem Radbremεzylinder 12 deε vorderen Fahrzeugrades verbunden. Durch eine zweite Drosεel 38 und ein in Richtung deε Radbremεzylinder 14 öffnendeε Rückschlagventil 40 iεt die Druckεeite der Rückförderpumpe 30 mit dem Radbremεzylinder 14 deε hinteren Fahrzeugrades verbunden.A pressure side of the return pump 30 is connected to the wheel brake cylinder 12 of the front vehicle wheel via a differential pressure valve 34 and a throttle 36 connected in series. The pressure side of the return pump 30 is connected to the wheel brake cylinder 14 of the rear vehicle wheel by a second throttle 38 and a check valve 40 opening in the direction of the wheel brake cylinder 14.
Des weiteren ist an die Druckseite der Rückförderpumpe 30 eine Steuerleitung 42 zur Betätigung der hydraulisch betätigbaren Trennventile 16, 18 angeschlossen. Bremsflüssigkeit von der Druckseite der Rückförderpumpe 30 betätigt die Trennventile 16, 18 in Richtung ihrer geschlossenen Schaltstellung. Des weiteren weisen die Trennventile 16, 18 einen an den Hauptbremszylinder 10 angeschloεεenen Steueranschluß 44 εowie ein Rückstellfederelement 46 auf, die daε Trennventil 16, 18 in der offenen Grundεtellung halten oder es in Richtung dieser Grundstellung betätigen. Die Trennventile 16, 18 weisen also eine Differenzdruck-Steuerschaltung 42, 44 auf, die das Trennventil 16, 18 schließt, wenn der Bremsflüsεigkeitsdruck auf der Druckseite der Rückförderpumpe 30 den Bremsflüεεigkeitεdruck des Hauptbremszylinders 10 um einen der Kraft des Rückstellfederelements 46 entsprechenden Wert übersteigt. Beim in Figur 1 dargestellten Ausführungsbeispiel ist der Rückförderpumpe 30 eine Drossel 48 parallel geschaltet, die zwar nicht in jedem Fall notwendig ist, jedoch einen noch zu beschreibenden Vorteil bringt.Furthermore, a control line 42 for actuating the hydraulically actuated isolating valves 16, 18 is connected to the pressure side of the return pump 30. Brake fluid from the pressure side of the return pump 30 actuates the isolating valves 16, 18 in the direction of their closed switching position. Furthermore, the isolating valves 16, 18 have a control connection 44 connected to the master brake cylinder 10 and a return spring element 46 which hold the isolating valve 16, 18 in the open basic position or actuate it in the direction of this basic position. The isolating valves 16, 18 thus have a differential pressure control circuit 42, 44 which closes the isolating valve 16, 18 when the brake fluid pressure on the pressure side of the return pump 30 exceeds the brake fluid pressure of the master brake cylinder 10 by a value corresponding to the force of the return spring element 46. In the embodiment shown in FIG. 1, the return pump 30 is connected in parallel with a throttle 48, which is not necessary in every case, but has an advantage to be described.
Jedes Fahrzeugrad weist einen Raddrehsensor 50, 52 auf, deren Signale einem elektronischen Steuergerät 54 zugeführt wird, das die Magnet-Auεlaßventile 24, 26 betätigt und den Pumpenmotor 32 ein- und auεschaltet.Each vehicle wheel has a wheel rotation sensor 50, 52, the signals of which are fed to an electronic control unit 54, which actuates the solenoid outlet valves 24, 26 and switches the pump motor 32 on and off.
Eine herkömmliche Bremsung, bei der keines der Fahrzeugräder zum Blockieren neigt, erfolgt in üblicher Weise durch Betätigung des Hauptbremszylinderε 10 mittels eines Fußbremspedalε 56. Durch die geöffenten Trennventile 16, 18 werden die Radbremszylinder 12, 14 mit Druck beaufεchlagt.Conventional braking, in which none of the vehicle wheels tends to lock up, is carried out in the usual way by actuating the master brake cylinder 10 by means of a foot brake pedal 56. The opened brake valves 16, 18 apply pressure to the wheel brake cylinders 12, 14.
Eine Blockiergefahr eines Fahrzeugrades, d. h. eine unzulässig schnell abfallende Raddrehzahl, stellt daε elektroniεche Steuergerät 54 mittelε der Raddrehεenεoren 50, 52 feεt. Eε öffnet das dieεem Fahrzeugrad zugeordnete Auslaßventil 24, 26, so daß Bremsflussigkeit aus dem entεprechenden Radbremεzylinder 12, 14 in den Speicher 28 εtrömt. Die Bremskraft dieεes Fahrzeugrades wird εomit verkleinert und ein Blockieren verhindert. Der Pumpenmotor 32 wird zeitverzögert nach Auftreten der Radblockiergefahr eingeεchaltet und die Rückförderpumpe 30 damit in Gang geεetzt. Sobald der Bremsflüssigkeitsdruck auf der Druckseite der Rückförderpumpe 30 den Bremsflüεεigkeitsdruck des Hauptbremszylinderε 10 um einen durch die Rückstell- federelemente 46 der Trennventile 16, 18 vorgebenen Wert überεteigt, schließen die Trennventile 16, 18. Die Druckdiffernez, bei der die Trennventile 16, 18 schließen, kann für beide Trennventile 16, 18 unterschiedlich sein, εie wird fahrzeugεpezifiεch auεgelegt. Der Hauptbremszylinder 10 wird durch Schließen der Trennventile 16, 18 von den RadbremsZylindern 12, 14 abgetrennt und Pedalrückwirkungen während der Blockierεchutzregelung unterbunden oder zumindest klein gehalten.A risk of the vehicle wheel locking, ie an impermissibly rapidly decreasing wheel speed, is established by the electronic control unit 54 by means of the wheel rotation sensors 50, 52. Eε opens the outlet valve 24, 26 assigned to this vehicle wheel, so that brake fluid flows out of the corresponding wheel brake cylinder 12, 14 into the reservoir 28. The braking force of this vehicle wheel is thus reduced and blocking is prevented. The pump motor 32 is switched on with a time delay after the risk of wheel lock occurs, and the return pump 30 is thus started. As soon as the brake fluid pressure on the pressure side of the return pump 30 exceeds the brake fluid pressure of the master brake cylinder 10 by a value specified by the return spring elements 46 of the isolating valves 16, 18, the isolating valves 16, 18 close. The pressure difference at which the isolating valves 16, 18 close can be different for both isolating valves 16, 18, it is designed to be vehicle-specific. The master brake cylinder 10 is separated from the wheel brake cylinders 12, 14 by closing the isolating valves 16, 18 and pedal reactions prevented or at least kept small during the anti-lock control.
Die Drosεel 36, 38 zwischen der Druckseite der Rückförderpumpe 30 und den Radbremszylindern 12, 14 drosεeln den Bremεflüεsigkeitεεtrom von der Rückförderpumpe 30 zu den Q Radbremεzylindern 12, 14 und halten dadurch den Druck auf der Druckεeite der Rückförderpumpe 30 hoch. Dadurch werden die Trennventile 16, 18 während der Blockierschutzregelung geschlosεen gehalten.The throttles 36, 38 between the pressure side of the return pump 30 and the wheel brake cylinders 12, 14 throttle the brake fluid flow from the return pump 30 to the Q wheel brake cylinders 12, 14 and thereby keep the pressure on the pressure side of the return pump 30 high. As a result, the isolation valves 16, 18 are kept closed during the anti-lock control.
15 Die Bremεflüεsigkeitεdruckmodulation im RadbremsZylinder 12, 14 eines zum Blockieren neigenden Fahrzeugrades wird durch getaktete Steuerung des Auεlaßventilε 24, 26 moduliert. Die Droεsel 36, 38 zwischen der Druckseite der Rückförderpumpe 30 und dem Radbremεzylinder 12, 14 bewirkt einen verlangεamten15 The brake fluid pressure modulation in the wheel brake cylinder 12, 14 of a vehicle wheel that tends to lock is modulated by clocked control of the exhaust valve 24, 26. The throttle 36, 38 between the pressure side of the return pump 30 and the wheel brake cylinder 12, 14 brings about a slowdown
2Q Bremsflüεεigkeitεdruckanstieg im Radbremεzylinder 12, 14, wenn die Rückförderpumpe 30 eingeschaltet und das Auslaßventil 24, 26 geschlosεen iεt. Der Druckverlauf im Radbremεzylinder 12, 14 iεt sägezahnförmig. Volumen und Kennlinie deε Speicherε 28 εind fahrzeugabhängig so pπ ausgelegt, daß eine auεreichende Volumenaufnahme sowohl bei langsamen als auch bei abruptem Wechsel eines Straßenreibwertes sichergeεtellt ist.2 Q brake fluid pressure increase in the wheel brake cylinder 12, 14 when the return pump 30 is switched on and the outlet valve 24, 26 is closed. The pressure curve in the wheel brake cylinder 12, 14 is sawtooth-shaped. The volume and characteristic curve of the memory 28 are designed pπ-dependent on the vehicle in such a way that sufficient volume absorption is ensured both when the road friction coefficient changes slowly and abruptly.
Mit dem Differenzdruckventil 34, das der Druckseite derWith the differential pressure valve 34 that the pressure side of the
30 Rückförderpumpe 30 und dem Radbremεzylinder 12 eineε Fahrzeugvorderradeε zwiεchengeεchaltet iεt, wird eine Bremεflüssigkeitsdruckdifferenz zwischen den Radbremε¬ zylindern 12, 14 während der Blockierεchutzregelung begünstigt. Das Hinterrad kann während der Blockier¬30 return pump 30 and the wheel brake cylinder 12 between a vehicle front wheel, a brake fluid pressure difference between the wheel brake cylinders 12, 14 is favored during the anti-lock control. The rear wheel can during the blocking
35 εchutzregelung stärker abgebremst werden, waε bei beladenem Fahrzeug einen kürzeren Bremsweg bewirkt.35 ε protection control are braked more, which means a shorter braking distance when the vehicle is loaded.
Vergrößert sich während der Blockierschutzregelung der Straßenreibwert, εo muß der Bremsflüssigkeitεdruck in den Radbremεzylindern 12, 14 erhöht werden, um die Fahrzeugräder so stark abzubremsen, daß sie zum Blockieren neigen und die maximal mögliche Bremskraft wirkt. Die Änderung des Straßenreibwertes erkennt daε elektroniεche Steuergerät 54 anhand der Signale der Raddrehεenεoren 50, 52. Um den Bremsflüssigkeitsdruck in den Radbremszylindern 12, 14 zu erhöhen, wird das dem Fahrzeugvorderrad zugeordneteIf the road friction coefficient increases during the anti-lock control, the brake fluid pressure must be in the Wheel brake cylinders 12, 14 are increased in order to brake the vehicle wheels so strongly that they tend to lock and the maximum possible braking force acts. The electronic control unit 54 detects the change in the road friction value on the basis of the signals from the wheel rotation sensors 50, 52. In order to increase the brake fluid pressure in the wheel brake cylinders 12, 14, the one assigned to the vehicle front wheel is assigned
Auslaßventil 24 geschloεεen und daε dem Fahrzeughinterrad zugeordnete Auslaßventil 26 geöffnet. Auf dieεe Weiεe fällt der Bremsflüssigkeitsdruck im Hinterradbremszylinder 14 nahezu auf Null. Die von der Rückförderpumpe 30 geförderte Bremsflüssigkeit gelangt im wesentlichen in denExhaust valve 24 closed and the exhaust valve 26 assigned to the vehicle rear wheel opened. In this way, the brake fluid pressure in the rear wheel brake cylinder 14 drops almost to zero. The brake fluid delivered by the return pump 30 essentially passes into the
Vorderradbremszylinder 12, dessen Bremskraft wird erhöht. Die Bremskraft des Fahrzeugs ist dadurch mit den infolge der geschlosεenen Trennventile 16, 18 zur Verfügung εtehenden Bremεflüεsigkeitsvolumens optimal.Front brake cylinder 12, the braking force is increased. The braking force of the vehicle is thus optimal with the brake fluid volume available as a result of the closed isolation valves 16, 18.
Nach Ablauf einer Zeitεpanne wird der Pumpenmotor 32 auεgeschaltet. Die Zeitεpanne iεt fahrzeugabhängig und/oder wird unter Berücksichtigung weiterer Größen der Fahrzeugbremsanlage, wie beispielsweise Temperatur oder Zähigkeit der Bremsflüεεigkeit festgelegt. Der Bremsflüsεigkeitεdruck auf der Druckseite der Rückförderpumpe 30 baut sich schnell durch die Drosεel 38, daε Rückεchlagventil 40 und daε geöffnete Auslaßventil 26 des Hinterradbremεzylinderε 14 in den Speicher 28 ab. Infolgedeεεen öffnen die Trennventile 16, 18, eε gelangt Bremsflüsεigkeit vom Hauptbremεzylinder 10 zu den Radbremεzylinder 12, 14. Der Bremsflüsεigkeitsdruck in den Radbremszylindern 12, 14 wird erhöht und die Blockierschutzregelung kann erneut beginnen.After a period of time, the pump motor 32 is switched off. The time period is dependent on the vehicle and / or is determined taking into account further variables of the vehicle brake system, such as temperature or viscosity of the brake fluid. The brake fluid pressure on the pressure side of the return pump 30 is rapidly reduced by the throttle 38, the check valve 40 and the open outlet valve 26 of the rear wheel brake cylinder 14 in the accumulator 28. As a result, the isolating valves 16, 18 open, brake fluid passes from the master brake cylinder 10 to the wheel brake cylinders 12, 14. The brake fluid pressure in the wheel brake cylinders 12, 14 is increased and the anti-lock control can begin again.
Die der Rückförderpumpe 30 parallel geschaltete Drossel 48 hat den Zweck, daß εich der Bremsflüsεigkeitsdruck auf der Druckεeite der Rückförderpumpe 30 nach deren Stillεetzung schneller entgegen der Förderrichtung der Rückförderpumpe 30 in den Speicher 28 abbauen kann. Die Dauer bis zum Öffnen der Trennventile 16, 18 wird verkürzt und derThe throttle 48, which is connected in parallel with the return pump 30, has the purpose that the brake fluid pressure on the pressure side of the return pump 30, after its shutdown, is faster against the delivery direction of the return pump 30 can degrade in the memory 28. The time until the isolation valves 16, 18 open is shortened and the
Bremsflüεsigkeitsdruck in den Radbremszylindern 12, 14 läßt sich früher erhöhen. Die Drossel 48 muß nicht vorhanden sein, bringt allerdings den vorstehend beschriebenen Vorteil.Brake fluid pressure in the wheel brake cylinders 12, 14 can be increased earlier. The throttle 48 does not have to be present, but brings the advantage described above.
In Figur 2 iεt ein Trennventil 16, 18 der in Figur 1 dargeεtellten Fahrzeugbremsanlage gezeigt. Es ist als Einsteckpatrone mit einem Ventilgehäuse 54 ausgebildet, die zum Einsetzen in eine Stufenbohrung 56 eines Hydraulikblocks 58 vorgesehen ist. Im nur ausschnittsweise dargestellten Hydraulikblock 58 εind auch die übrigen Ventile 24, 26, 34, der Speicher 28 und die Rückförderpumpe 30 aufgenommen. Das Ventilgehäuse 54 ist komplementär zur Stufenbohrung 56 ausgebildet, jede Stufung iεt mittels eines Dichtrings 62 gegen den Hydraulikblock 58 abgedichtet.FIG. 2 shows a isolating valve 16, 18 of the vehicle brake system shown in FIG. 1. It is designed as a cartridge with a valve housing 54, which is provided for insertion into a stepped bore 56 of a hydraulic block 58. The remaining valves 24, 26, 34, the accumulator 28 and the return pump 30 are also included in the hydraulic block 58, which is only shown in part. The valve housing 54 is complementary to the stepped bore 56, and each step is sealed against the hydraulic block 58 by means of a sealing ring 62.
Im Ventilgehäuse 54 ist ein Ventilkolben 64 aufgenommen. Der Ventilkolben 64 weist eine Kugel als Ventilschließkörper 66 auf. Eine Schraubendruckfeder 68 drückt den Ventilkolben 64 und mit ihm den Ventilkörper 66 von einem Ventilsitz ab. Das Trennventil 16, 18 ist also in seiner Grundstellung geöffnet.A valve piston 64 is received in the valve housing 54. The valve piston 64 has a ball as the valve closing body 66. A helical compression spring 68 presses the valve piston 64 and with it the valve body 66 from a valve seat. The isolating valve 16, 18 is therefore open in its basic position.
Zur hydraulischen Betätigung des Trennventils 16, 18 ist im Ventilgehäuse 54 eine Radialbohrung 72 angebracht, die auf einer dem Ventilsitz abgewandten Seite des Ventilkolbens 64 mündet. Diese Randialbohrung 72 kommuniziert über einen Bremsflüssigkeitskanal 74 im Hydraulikblock 58 mit der Druckseite der Rückförderpumpe 30.For hydraulic actuation of the separating valve 16, 18, a radial bore 72 is made in the valve housing 54, which opens on a side of the valve piston 64 facing away from the valve seat. This radial bore 72 communicates with the pressure side of the return pump 30 via a brake fluid channel 74 in the hydraulic block 58.
Ein weiterer Bremsflüεεigkeitskanal 76, der mit dem HauptbremsZylinder 10 verbunden ist, kommuniziert durch eine Radialbohrung 78 im Ventilgehäuse 54 mit einer dem Ventilsitz 70 zugewandten Seite des Ventilkolbens 64. Eε wird also eine Differenzdrucksteuerung des Trennventils 16, 18 erreicht: übersteigt der Druck auf der dem Ventilssitz 70 abgewandten Seite des Ventilkolbens 64 (alεo auf der Druckεeite der Rückförderpumpe 30) herrεchende Druck denAnother brake fluid channel 76, which is connected to the master brake cylinder 10, communicates through a radial bore 78 in the valve housing 54 with a side of the valve piston 64 facing the valve seat 70. Eε thus a differential pressure control of the isolating valve 16, 18 is achieved: exceeds the pressure on the Valve seat 70 facing away Side of the valve piston 64 (ie on the pressure side of the return pump 30) the pressure prevailing
Bremεflüεsigkeitεdruck auf der dem Ventilεitz 70 zugewandtenBrake fluid pressure on the valve seat 70 facing
Seite deε Ventilkolbens 64 (dies ist der imSide of the valve piston 64 (this is the one in the
Hauptbremszylinder 10 herrschende Druck) um den der Kraft derMaster cylinder 10 prevailing pressure) around the force of the
Schraubendruckfeder 68 entsprechenden Wert, so wird daε Trennventil 16, 18 geschloεsen. Ein Ventilauεlaß 80 erfolgt axial durch den Ventilεitz 70 hindurch. Der Ventilauslaß 80 kommuniziert mit dem Radbremszylinder 12, 14. Helical compression spring 68 corresponding value, the isolating valve 16, 18 is closed. A valve outlet 80 takes place axially through the valve seat 70. The valve outlet 80 communicates with the wheel brake cylinder 12, 14.

Claims

Patentansprüche claims
1. Fahrzeugbremsanlage mit Blockierschutzregeleinrichtung, mit einem Hauptbremszylinder, mindestens einem Radbremszylinder, mit einem zwiεchen dem Hauptbremszylinder und dem Radbremszylinder angeordnetem Trennventil und einem Auslaßventil für den Radbremszylinder, mit einem Speicher zur Aufnahme des aus dem Radbremszylinder mit dem Auslaßventil abgelasεenen Bremsfluids und einer Rückförderpumpe zum Fördern von Bremsflüεεigkeit aus dem Speicher in den Radbremεzylinder, dadurch gekennzeichnet, daß das Trennventil (16, 18) fluidbetätigt ist und zur Steuerung in eine geschlossene Stellung mit Bremsfluid von einer Druckseite der Rückförderpumpe (30) beaufεchlagt wird.1. Vehicle brake system with anti-lock control device, with a master brake cylinder, at least one wheel brake cylinder, with a separating valve arranged between the master brake cylinder and the wheel brake cylinder and an outlet valve for the wheel brake cylinder, with a memory for receiving the brake fluid drained from the wheel brake cylinder with the outlet valve and a return pump for conveying of brake fluid from the reservoir into the wheel brake cylinder, characterized in that the separating valve (16, 18) is fluid-operated and brake fluid from a pressure side of the return pump (30) is applied to the control in a closed position.
2. Fahrzeugbremεanlage nach Anεpruch 1, dadurch gekennzeichnet, daß εie eine der Druckseite der Rückförderpumpe (30) und dem Radbremεzylinder (12, 14) zwischengeschaltete Drosεel (36, 38) aufweiεt.2. Vehicle brake system according to claim 1, characterized in that εie one of the pressure side of the return pump (30) and the wheel brake cylinder (12, 14) interposed throttle (36, 38).
3. Fahrzeugbremεanlage nach Anεpruch 1 oder 2, dadurch gekennzeichnet, daß das Trennventil (16, 18) eine Differenzdruckεteuerung aufweist, die daε Trennventil bei Überschreiten einer Schwellendruckdifferenz zwischen der Druckseite der Rückförderpumpe (30) und dem Hauptbremszylinder (10) schließt. 3. Vehicle brake system according to claim 1 or 2, characterized in that the isolating valve (16, 18) has a differential pressure control which closes the isolating valve when a threshold pressure difference between the pressure side of the return pump (30) and the master brake cylinder (10) is exceeded.
4. Fahrzeugbremsanlage nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Fahrzeugbremsanlage mindestens zwei Radbremszylinder (12, 14) aufweist, und daß der Druckseite der Rückförderpumpe (30) und mindestens einem Radbremszylinder (12) ein Differenzdruckventil (34) und dem/den anderen Radbremszylinder/n (14) ein in Richtung des Radbremszylinders (14) öffnendes Rückschlagventil (40) zwischengeschaltet ist.4. Vehicle brake system according to one of claims 1 to 3, characterized in that the vehicle brake system has at least two wheel brake cylinders (12, 14), and that the pressure side of the return pump (30) and at least one wheel brake cylinder (12), a differential pressure valve (34) and / the other wheel brake cylinder (s) (14) a check valve (40) opening in the direction of the wheel brake cylinder (14) is interposed.
5. Fahrzeugbremsanlage nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Rückförderpumpe (30) eine Drossel (48) parallel geschaltet iεt.5. Vehicle brake system according to one of claims 1 to 4, characterized in that the return pump (30) is a throttle (48) connected in parallel.
6. Verfahren zur Blockierεchutzregelung einer Fahrzeugbremsanlage nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß bei Auftreten einer Blockierneigung eines Fahrzeugrades das Auslaßventil (24, 26) des Radbremszylinders (12, 14) dieseε Fahrzeugrades geöffnet wird.6. A method for blocking protection control of a vehicle brake system according to one of the preceding claims, characterized in that when a tendency to lock a vehicle wheel occurs, the outlet valve (24, 26) of the wheel brake cylinder (12, 14) opens this vehicle wheel.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß nach Öffnen des Auslaßventils (24, 26) die Rückförderpumpe (30) in Gang gesetzt wird.7. The method according to claim 6, characterized in that after opening the outlet valve (24, 26), the return pump (30) is started.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß ein Bremsflüεεigkeitεdruck im Radbremszylinder (12, 14) des zum Blockieren neigenden Fahrzeugrades mittels seines Auslaßventils (24, 26) moduliert wird. 8. The method according to claim 7, characterized in that a Bremsflüεεigkeitεdruck in the wheel brake cylinder (12, 14) of the vehicle wheel tending to lock is modulated by means of its exhaust valve (24, 26).
PCT/DE1996/002038 1996-02-14 1996-10-25 Vehicle brake system with anti-locking means WO1997029936A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP96945533A EP0820392A1 (en) 1996-02-14 1996-10-25 Vehicle brake system with anti-locking means
JP9528867A JPH11503987A (en) 1996-02-14 1996-10-25 Vehicle brake device with anti-lock control device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19605372A DE19605372A1 (en) 1996-02-14 1996-02-14 Vehicle brake system with anti-lock control device
DE19605372.2 1996-02-14

Publications (1)

Publication Number Publication Date
WO1997029936A1 true WO1997029936A1 (en) 1997-08-21

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ID=7785337

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PCT/DE1996/002038 WO1997029936A1 (en) 1996-02-14 1996-10-25 Vehicle brake system with anti-locking means

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EP (1) EP0820392A1 (en)
JP (1) JPH11503987A (en)
KR (1) KR19980703835A (en)
DE (1) DE19605372A1 (en)
WO (1) WO1997029936A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016096531A1 (en) * 2014-12-16 2016-06-23 Continental Teves Ag & Co. Ohg Brake control device and brake system for vehicles

Citations (5)

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Publication number Priority date Publication date Assignee Title
DE3542689A1 (en) * 1985-12-03 1987-06-04 Bosch Gmbh Robert Antilock brake system
DE4004315A1 (en) * 1990-02-13 1991-08-14 Bosch Gmbh Robert VEHICLE BRAKE SYSTEM WITH ANTI-BLOCKING DEVICE
DE4010841A1 (en) * 1989-06-17 1991-10-10 Teves Gmbh Alfred Anti-lock hydraulic brake motor vehicle
GB2262580A (en) * 1991-12-20 1993-06-23 Lucas Ind Plc Hydraulic anti-lock braking systems for vehicles
US5281010A (en) * 1992-11-19 1994-01-25 Allied-Signal Inc. Pumpback adaptive braking system with slave isolation valve

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3542689A1 (en) * 1985-12-03 1987-06-04 Bosch Gmbh Robert Antilock brake system
DE4010841A1 (en) * 1989-06-17 1991-10-10 Teves Gmbh Alfred Anti-lock hydraulic brake motor vehicle
DE4004315A1 (en) * 1990-02-13 1991-08-14 Bosch Gmbh Robert VEHICLE BRAKE SYSTEM WITH ANTI-BLOCKING DEVICE
GB2262580A (en) * 1991-12-20 1993-06-23 Lucas Ind Plc Hydraulic anti-lock braking systems for vehicles
US5281010A (en) * 1992-11-19 1994-01-25 Allied-Signal Inc. Pumpback adaptive braking system with slave isolation valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016096531A1 (en) * 2014-12-16 2016-06-23 Continental Teves Ag & Co. Ohg Brake control device and brake system for vehicles

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JPH11503987A (en) 1999-04-06
DE19605372A1 (en) 1997-08-21
EP0820392A1 (en) 1998-01-28
KR19980703835A (en) 1998-12-05

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