EP2655142A1 - Method for controlling a wheel brake pressure in a hydraulic vehicle braking system - Google Patents

Method for controlling a wheel brake pressure in a hydraulic vehicle braking system

Info

Publication number
EP2655142A1
EP2655142A1 EP11773279.2A EP11773279A EP2655142A1 EP 2655142 A1 EP2655142 A1 EP 2655142A1 EP 11773279 A EP11773279 A EP 11773279A EP 2655142 A1 EP2655142 A1 EP 2655142A1
Authority
EP
European Patent Office
Prior art keywords
wheel
wheel brake
pump
valve
brake
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Withdrawn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
EP11773279.2A
Other languages
German (de)
French (fr)
Inventor
Dietmar Baumann
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.)
Robert Bosch GmbH
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
Publication of EP2655142A1 publication Critical patent/EP2655142A1/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Withdrawn legal-status Critical Current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
    • B60T13/12—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
    • B60T13/168—Arrangements for pressure supply
    • 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
    • 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
    • B60T8/4031—Pump units characterised by their construction or mounting
    • 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
    • B60T8/4086—Systems with stroke simulating devices for driver input the stroke simulating device being connected to, or integrated in the driver input device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement

Definitions

  • the invention relates to a method for controlling a wheel brake pressure in a wheel brake cylinder of a slip-controlled hydraulic vehicle brake system having the features of the preamble of claim 1.
  • the vehicle brake system is particularly slip-controlled, i. it has a brake (anti-lock) control, traction control and / or vehicle dynamics control, for which the abbreviations ABS, ASR, FDR, ESP are common, or the vehicle brake system is a foreign-vehicle brake system, in which a brake pressure with a piston pump is constructed, wherein the foreign-vehicle brake system may have a slip control.
  • the regulation of the wheel brake pressure is the normal case, ie a service brake, it is the wheel brake pressure regulated in response to a target value for the braking force.
  • a slip control can be done.
  • a regulation within the meaning of the invention also includes a controller.
  • a wheel brake pressure in one or preferably a plurality of wheel brake cylinders of the vehicle brake system is regulated, whereby a wheel-specific regulation of the wheel brake pressures, a group-wise control of wheel brake pressures in several wheel brake cylinders together or also a regulation of the wheel brake pressure in all wheel brake cylinders can take place together.
  • the well-known Vehicle brake system has a muscle-power actuated master cylinder, to which via a separating valve per brake circuit, for example, two brake circuits, are connected.
  • a separating valve per brake circuit for example, two brake circuits.
  • One or more wheel brake cylinders of hydraulic wheel brakes are connected to each brake circuit, with each wheel brake cylinder having a brake pressure build-up valve for wheel-specific regulation of the wheel brake pressure, by means of which it is connected to the brake circuit.
  • each wheel brake cylinder has a brake pressure reduction valve, by which it is connected to a suction side of a piston pump, wherein the vehicle brake system has a piston pump in each brake circuit to which all wheel brake cylinders
  • Brake circuit are connected via their brake pressure reduction valves.
  • a pressure side of the piston pump is connected between the isolation valve and the brake pressure build-up valves to the brake circuit.
  • the respective brake pressure build-up valve is closed and the brake pressure reduction valve is opened so that brake fluid flows out of the wheel brake cylinder.
  • a buildup or an increase of the wheel brake pressure takes place with the piston pump through the opened brake pressure build-up valve, the brake pressure lowering valve is closed during the pressure build-up or the pressure increase. Due to the isolation valve, brake fluid can be pumped back to the master cylinder with the piston pump.
  • the hydraulic vehicle brake system according to the invention with the features of claim 1 has at least one wheel brake cylinder and a piston pump, to which the wheel brake cylinder is connected via a wheel valve.
  • the designation of the valve as a "wheel valve” serves to uniquely identify the valve and should indicate its assignment to the wheel brake cylinder of the wheel brake of a vehicle wheel.Also, several wheel brake cylinders can be connected together to a wheel valve the wheel brake pressure (s) is used for slip control and / or in a vehicle power brake system during a service brake
  • the wheel valve is opened during a delivery stroke of the piston pump and closed during a suction stroke.
  • the increase in the wheel brake pressure also includes a zero wheel brake pressure build-up.
  • the wheel valve is controlled in reverse according to claim 2, ie it is closed during the delivery stroke of the piston pump and opened during the intake stroke.
  • the wheel valve can only during a part of the respective
  • Hubs of the piston pump or closed are comparable to a phase control.
  • the wheel valve can also be opened clocked with a pulse width modulation.
  • a proportional valve When using a proportional valve, a partial opening of the wheel valve is possible.
  • the vehicle brake system has a piston pump or a multi-piston pump with a pump element for each wheel brake cylinder for each wheel brake cylinder. If the wheel brake pressures are controlled jointly in groups of wheel brake cylinders or in all wheel brake cylinders, a piston pump or a pump element is sufficient for each group or for all wheel brake cylinders.
  • the wheel valve is not open continuously during a pressure build-up or down, but it is opened during a stroke of the piston pump and is closed at the opposite stroke.
  • the invention has the advantage that it requires only one valve per wheel brake cylinder, namely the valve designated here as a wheel valve. Hydraulic accumulator and check valves are dispensable and it suffices a valve type, preferably a valve which is open in the de-energized basic position. Another advantage of the invention is the possibility of reversing the conveying direction of the piston pump away from
  • Wheel brake cylinder in the direction of, for example, a master cylinder. Furthermore, an energy consumption and a mechanical-hydraulic load on the piston pump can be reduced if the wheel valve or the wheel valves are opened only during a part of the delivery stroke with a slight increase in the wheel brake pressure.
  • the hydraulicggybremsanla- invention 1 shown in Figure 1, according to the invention comprises a tandem master cylinder 2, to the two brake circuits I,
  • the vehicle brake system 1 has four wheel brakes with wheel brake cylinders 3, which are assigned in pairs to the two brake circuits I, II.
  • the number of four wheel brakes and their assignment to the brake circuits I, II is not mandatory for the invention.
  • the vehicle brake system 1 has a piston pump 4 with four pump elements
  • the pump elements 5 can also be regarded as individual piston pumps.
  • the pump elements 5 are arranged in a star shape and with an angular offset of 90 ° around an eccentric 6 around which is rotatably driven about an eccentric shaft 7.
  • Pistons 8 of the pump elements 5 bear with end faces on a circumference of the eccentric 6 and are held by piston springs 9 in abutment on the circumference of the eccentric 6.
  • a rotary drive of the eccentric 6 drives the piston 8 in a conventional manner to a reciprocating stroke movement.
  • the pistons 5 are double-acting, their one sides are connected to the master cylinder 2 and to their other sides are connected via a respective wheel valve 10, the wheel brake cylinder 3.
  • Each pump element 5 has a pump valve 1 1, through which the two sides of its piston 8 are connectable.
  • the wheel valves 10 and the pump valves 11 are in their de-energized
  • Wheel valves 10 open and thus do not close at the same time, but according to the phase offset of the pump elements 5 in succession. This also applies to the pump valves 11.
  • the pump valves 1 1 are controlled in opposition to the wheel valves 10, i. they are closed during the delivery stroke of the associated piston 8 and opened during the intake stroke.
  • Delivery stroke is the stroke of one of the pistons 8, during which the piston 8 displaces brake fluid in the direction of the wheel brake cylinder 3.
  • the piston 8 moves away from the eccentric 6 during the delivery stroke.
  • the vehicle brake system 1 has a pump position sensor 12.
  • the pump position sensor 12 is a rotation angle sensor which measures a rotation angle of the eccentric 6.
  • the pump pistons 8 suck brake fluid from the master brake cylinder 2 on their sides facing the eccentric 6.
  • brake fluid flows through the then open pump valves 11 from the eccentric side to the eccentric side of the pistons 8 so that they pass through the then open wheel valve during the subsequent delivery stroke when the pump valve 11 is closed
  • the wheel valves 10 and the pump valves 11 are inversely controlled as for increasing the wheel brake pressures, i. the wheel valves 10 are closed during the discharge stroke directed away from the eccentric 6 and opened during the suction stroke directed inwards towards the eccentric 6, so that the pistons 8 draw brake fluid through the open wheel valves 10 from the wheel brake cylinders 3 during the suction stroke.
  • the pump valves 11 are opened during the delivery stroke, so that the piston 8 previously from the wheel brake cylinders
  • the wheel valves 10 and the pump valves 11 are not opened during the entire stroke, but comparable to a phase control only during part of the stroke of the respective piston 8.
  • the wheel valves 10 and the pump valves 11 are open in their currentless basic positions, so that the wheel brake cylinders 3 communicate with the master brake cylinder 2 through the wheel valves 10 and the pump valves 11 and the vehicle brake system 1 contributes to service braking or auxiliary braking a disorder by muscle power with the master cylinder 2 is actuated.
  • the master cylinder 2 may have a known, not shown brake booster. In the manner described above, an external power braking with the piston pump 4 is possible. Likewise, a wheel-specific slip control known per se is possible.
  • the master cylinder 2 has a pedal travel simulator 13 with an annular simulator piston 14 which operates against a simulator spring 15. By closing a simulator valve 16 between a brake fluid reservoir 17 and the master cylinder 2 is a
  • the simulator spring 15 causes in this case a pedal force on the brake pedal 18.
  • a chamber of the master cylinder 2 is in the case of a power brake by opening a
  • Decoupling valve 18, which connects this chamber of the master cylinder 2 with the brake fluid reservoir 17, depressurized. A brake pressure build-up takes place as described above with the piston pump 4.
  • the pump elements 5 of the piston pump 4 have single-acting pistons 8.
  • Wheel brake cylinder 3 are as in Figure 1 via wheel valves 10 to the Pump elements 5 connected.
  • the pump elements 5 are connected on the same side of their pistons 8 as the wheel brake cylinder 3 via pump valves 11 to the master cylinder 2.
  • a construction or an increase of wheel brake pressures in the wheel brake cylinders 3 takes place as described for FIG. 1, by opening the wheel valves 10 during the delivery stroke of the associated piston 8 and closing the pump valves 11 and reversing the wheel valves 10 and opening the pump valves 11 during the intake stroke become.
  • the respective piston 8 displaces brake fluid through the open during the delivery stroke wheel valve 10 in the connected wheel brake cylinder 3, wherein he has sucked the brake fluid in the previous intake stroke with the wheel valve 10 closed by the open pump valve 1 1.
  • Lowering of the wheel brake pressures in the wheel brake cylinders 3 takes place by reverse control of the valves 10, 11, the wheel valves 10 are closed during the delivery stroke and the pump valves 11 are opened, so that the pistons 8 brake fluid through the open pump valves 1 1 in the master cylinder. 2 displace.
  • the wheel valves 10 are opened to lower the wheel brake pressures and the pump valves 11 are closed, so that the pistons 8 draw in brake fluid from the wheel brake cylinders 3.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulating Braking Force (AREA)

Abstract

The invention relates to a method for controlling the wheel brake pressures in wheel brake cylinders (3) in a hydraulic vehicle braking system (1). The invention proposes to connect the wheel brake cylinders (3) via wheel valves (10) to a piston pump (4), the pistons (8) of which are double-action pistons, and the two piston sides are connectable by means of pump valves (11). In order to increase the wheel brake pressure, the wheel valves (10) are opened during a delivery stroke of the piston pump (4) and the pump valves (11) are closed, and the wheel valves (10) are closed and the pump valves (11) opened during a suction stroke. In order to reduce the wheel brake pressures, the valves (10, 11) are controlled in reverse.

Description

Beschreibung  description
Titel title
Verfahren zur Regelung eines Radbremsdrucks einer hydraulischen Fahrzeugbremsanlage  Method for controlling a wheel brake pressure of a hydraulic vehicle brake system
Die Erfindung betrifft ein Verfahren zur Regelung eines Radbremsdrucks in einem Radbremszylinder einer schlupfgeregelten hydraulischen Fahrzeugbremsanlage mit den Merkmalen des Oberbegriffs des Anspruchs 1. The invention relates to a method for controlling a wheel brake pressure in a wheel brake cylinder of a slip-controlled hydraulic vehicle brake system having the features of the preamble of claim 1.
Die Fahrzeugbremsanlage ist insbesondere schlupfgeregelt, d.h. sie weist eine Brems-(Blockierschutz-) Regelung, eine Antriebsschlupfregelung und/oder eine Fahrdynamikregelung auf, für die die Abkürzungen ABS, ASR, FDR, ESP gebräuchlich sind, oder die Fahrzeugbremsanlage ist eine Fremdkraft- Fahrzeugbremsanlage, bei der ein Bremsdruck mit einer Kolbenpumpe aufgebaut wird, wobei die Fremdkraft-Fahrzeugbremsanlage eine Schlupfregelung aufweisen kann. Bei einer Fremdkraft-Fahrzeugbremsanlage ist die Regelung des Radbremsdrucks der Normalfall, also eine Betriebsbremsung, es wird der Radbremsdruck in Abhängigkeit von einem Sollwert für die Bremskraft geregelt. Zusätzlich, abhängig von der Fahrsituation auch ausschließlich, kann eine Schlupfregelung erfolgen. Eine Regelung im Sinne der Erfindung umfasst auch eine Steuerung. Es wird ein Radbremsdruck in einem oder vorzugsweise mehreren Radbremszylindern der Fahrzeugbremsanlage geregelt, wobei eine radindividuelle Regelung der Radbremsdrücke, eine gruppenweise Regelung von Radbremsdrücken in mehreren Radbremszylindern gemeinsam oder auch eine Regelung des Radbremsdrucks in allen Radbremszylindern gemeinsam erfolgen kann. The vehicle brake system is particularly slip-controlled, i. it has a brake (anti-lock) control, traction control and / or vehicle dynamics control, for which the abbreviations ABS, ASR, FDR, ESP are common, or the vehicle brake system is a foreign-vehicle brake system, in which a brake pressure with a piston pump is constructed, wherein the foreign-vehicle brake system may have a slip control. In a foreign-vehicle brake system, the regulation of the wheel brake pressure is the normal case, ie a service brake, it is the wheel brake pressure regulated in response to a target value for the braking force. In addition, depending on the driving situation also exclusively, a slip control can be done. A regulation within the meaning of the invention also includes a controller. A wheel brake pressure in one or preferably a plurality of wheel brake cylinders of the vehicle brake system is regulated, whereby a wheel-specific regulation of the wheel brake pressures, a group-wise control of wheel brake pressures in several wheel brake cylinders together or also a regulation of the wheel brake pressure in all wheel brake cylinders can take place together.
Stand der Technik Schlupfgeregelte hydraulische Fahrzeugbremsanlagen sind bekannt, beispielhaft wird verwiesen auf die Offenlegungsschrift DE 198 25 114 A1. Die bekannte Fahrzeugbremsanlage weist einen muskelkraftbetätigbaren Hauptbremszylinder auf, an den über ein Trennventil je Bremskreis, beispielsweise zwei Bremskreise, angeschlossen sind. An jeden Bremskreis sind ein oder mehrere Radbremszylinder hydraulischer Radbremsen angeschlossen, wobei zu einer radindividuellen Regelung des Radbremsdrucks jeder Radbremszylinder ein Bremsdruckaufbauventil aufweist, durch das er an den Bremskreis angeschlossen ist. Des weiteren weist zu einer radindividuellen Regelung des Radbremsdrucks jeder Radbremszylinder ein Bremsdruckabsenkventil auf, durch das er an eine Saugseite einer Kolbenpumpe angeschlossen ist, wobei die Fahrzeugbremsanlage in jedem Bremskreis eine Kolbenpumpe aufweist, an den alle Radbremszylinder diesesBACKGROUND ART Slip-controlled hydraulic vehicle brake systems are known, by way of example reference is made to the published patent application DE 198 25 114 A1. The well-known Vehicle brake system has a muscle-power actuated master cylinder, to which via a separating valve per brake circuit, for example, two brake circuits, are connected. One or more wheel brake cylinders of hydraulic wheel brakes are connected to each brake circuit, with each wheel brake cylinder having a brake pressure build-up valve for wheel-specific regulation of the wheel brake pressure, by means of which it is connected to the brake circuit. Furthermore, for a wheel-specific regulation of the wheel brake pressure, each wheel brake cylinder has a brake pressure reduction valve, by which it is connected to a suction side of a piston pump, wherein the vehicle brake system has a piston pump in each brake circuit to which all wheel brake cylinders
Bremskreises über ihre Bremsdruckabsenkventile angeschlossen sind. Eine Druckseite der Kolbenpumpe ist zwischen dem Trennventil und den Bremsdruckaufbauventilen an den Bremskreis angeschlossen. Zum Absenken des Radbremsdrucks in einem oder mehreren Radbremszylindern während einer Schlupfregelung wird das jeweilige Bremsdruckaufbauventil geschlossen und das Bremsdruckabsenkventil geöffnet, so dass Bremsflüssigkeit aus dem Radbremszylinder ausströmt. Ein Aufbau oder eine Erhöhung des Radbremsdrucks erfolgt mit der Kolbenpumpe durch das geöffnete Bremsdruckauf- bauventil, das Bremsdruckabsenkventil ist beim Druckaufbau oder der Druckerhöhung geschlossen. Durch das Trennventil lässt sich mit der Kolbenpumpe Bremsflüssigkeit zurück zum Hauptbremszylinder fördern. Brake circuit are connected via their brake pressure reduction valves. A pressure side of the piston pump is connected between the isolation valve and the brake pressure build-up valves to the brake circuit. To lower the wheel brake pressure in one or more wheel brake cylinders during a slip control, the respective brake pressure build-up valve is closed and the brake pressure reduction valve is opened so that brake fluid flows out of the wheel brake cylinder. A buildup or an increase of the wheel brake pressure takes place with the piston pump through the opened brake pressure build-up valve, the brake pressure lowering valve is closed during the pressure build-up or the pressure increase. Due to the isolation valve, brake fluid can be pumped back to the master cylinder with the piston pump.
Offenbarung der Erfindung Disclosure of the invention
Die erfindungsgemäße hydraulische Fahrzeugbremsanlage mit den Merkmalen des Anspruchs 1 weist mindestens einen Radbremszylinder und eine Kolbenpumpe auf, an die der Radbremszylinder über ein Radventil angeschlossen ist. Die Bezeichnung des Ventils als„Radventil" dient der eindeutigen Bezeichnung des Ventils und soll dessen Zuordnung zum Radbremszylinder der Radbremse eines Fahrzeugrads andeuten. Es können auch mehrere Radbremszylinder gemeinsam an ein Radventil angeschlossen sein. Während der Regelung des Radbremsdrucks wird die Kolbenpumpe angetrieben. Die Regelung des oder der Radbremsdrücke erfolgt zur Schlupfregelung und/oder bei einer Fremdkraft- Fahrzeugbremsanlage während einer Betriebsbremsung. Die Aufzählung derThe hydraulic vehicle brake system according to the invention with the features of claim 1 has at least one wheel brake cylinder and a piston pump, to which the wheel brake cylinder is connected via a wheel valve. The designation of the valve as a "wheel valve" serves to uniquely identify the valve and should indicate its assignment to the wheel brake cylinder of the wheel brake of a vehicle wheel.Also, several wheel brake cylinders can be connected together to a wheel valve the wheel brake pressure (s) is used for slip control and / or in a vehicle power brake system during a service brake
Regelungen der Radbremsdrücke ist nicht abschließend. Zur Erhöhung des Radbremsdrucks während einer Regelung des Radbremsdrucks wird beim erfindungsgemäßen Verfahren mit den Merkmalen des Anspruchs 1 das Radventil während eines Förderhubs der Kolbenpumpe geöffnet und während eines Saughubs geschlossen. Die Erhöhung des Radbremsdrucks umfasst auch einen Aufbau des Radbremsdrucks von Null. Zum Absenken des Radbremsdrucks wird gemäß Anspruch 2 das Radventil umgekehrt gesteuert, d.h. es wird während des Förderhubs der Kolbenpumpe geschlossen und während des Saughubs geöffnet. Zu einer geringeren Erhöhung oder Absenkung des Radbremsdrucks kann das Radventil nur während eines Teils des jeweiligenRegulations of wheel brake pressures is not exhaustive. To increase the wheel brake pressure during a control of the wheel brake pressure in the inventive method with the features of claim 1, the wheel valve is opened during a delivery stroke of the piston pump and closed during a suction stroke. The increase in the wheel brake pressure also includes a zero wheel brake pressure build-up. To lower the wheel brake pressure, the wheel valve is controlled in reverse according to claim 2, ie it is closed during the delivery stroke of the piston pump and opened during the intake stroke. To a lesser increase or decrease of the wheel brake pressure, the wheel valve can only during a part of the respective
Hubs der Kolbenpumpe bzw. geschlossen werden vergleichbar einer Phasenanschnittsteuerung. Das Radventil kann auch getaktet mit einer Pulsweiten- Modulation geöffnet werden. Bei Verwendung eines Proportionalventils ist ein teilweises Öffnen des Radventils möglich. Zu einer radindividuellen Regelung weist die Fahrzeugbremsanlage für jeden Radbremszylinder eine Kolbenpumpe bzw. eine Mehrkolbenpumpe mit einem Pumpenelement für jeden Radbremszylinder auf. Werden die Radbremsdrücke in Gruppen von Radbremszylindern oder in allen Radbremszylindern gemeinsam geregelt, genügt für jede Gruppe bzw. für alle Radbremszylinder eine Kolbenpumpe bzw. ein Pumpenelement. Hubs of the piston pump or closed are comparable to a phase control. The wheel valve can also be opened clocked with a pulse width modulation. When using a proportional valve, a partial opening of the wheel valve is possible. For a wheel-specific regulation, the vehicle brake system has a piston pump or a multi-piston pump with a pump element for each wheel brake cylinder for each wheel brake cylinder. If the wheel brake pressures are controlled jointly in groups of wheel brake cylinders or in all wheel brake cylinders, a piston pump or a pump element is sufficient for each group or for all wheel brake cylinders.
Im Unterschied zum Stand der Technik bleibt bei der Erfindung das Radventil während eines Druckauf- oder -abbaus nicht durchgehend geöffnet, sondern es wird jeweils während eines Hubs der Kolbenpumpe geöffnet und ist beim entgegengesetzten Hub geschlossen. In contrast to the prior art, in the invention, the wheel valve is not open continuously during a pressure build-up or down, but it is opened during a stroke of the piston pump and is closed at the opposite stroke.
Die Erfindung hat den Vorteil, dass sie nur ein Ventil pro Radbremszylinder benötigt, nämlich das hier als Radventil bezeichnete Ventil. Hydrospeicher und Rückschlagventile sind entbehrlich und es genügt ein Ventiltyp, vorzugsweise ein in der stromlosen Grundstellung offenes Ventil. Ein weiterer Vorteil der Erfindung ist die Möglichkeit der Umkehrung der Förderrichtung der Kolbenpumpe weg vomThe invention has the advantage that it requires only one valve per wheel brake cylinder, namely the valve designated here as a wheel valve. Hydraulic accumulator and check valves are dispensable and it suffices a valve type, preferably a valve which is open in the de-energized basic position. Another advantage of the invention is the possibility of reversing the conveying direction of the piston pump away from
Radbremszylinder in Richtung beispielsweise eines Hauptsbremszylinders. Des weiteren lassen sich ein Energieverbrauch und eine mechanisch-hydraulische Belastung der Kolbenpumpe verringern, wenn das Radventil oder die Radventile bei einer geringen Erhöhung des Radbremsdrucks nur während eines Teils des Förderhubs geöffnet werden. Die Unteransprüche haben vorteilhafte Ausgestaltungen und Weiterbildungen der im Anspruch 1 angegeben Erfindung zum Gegenstand. Wheel brake cylinder in the direction of, for example, a master cylinder. Furthermore, an energy consumption and a mechanical-hydraulic load on the piston pump can be reduced if the wheel valve or the wheel valves are opened only during a part of the delivery stroke with a slight increase in the wheel brake pressure. The dependent claims have advantageous embodiments and developments of the invention defined in claim 1 to the subject.
Kurze Beschreibung der Zeichnung Short description of the drawing
Die Erfindung wird nachfolgend anhand zweier in der Zeichnung dargestellter Ausführungsbeispiele näher erläutert. Die beiden Figuren zeigen hydraulische Schaltpläne zweier Ausführungsformen der Erfindung. Die Figuren sind als vereinfachte und schematisierte Darstellung zum Verständnis und zur Erläuterung der Erfindung zu verstehen. The invention will be explained in more detail with reference to two illustrated in the drawings embodiments. The two figures show hydraulic circuit diagrams of two embodiments of the invention. The figures are to be understood as a simplified and schematic representation for the understanding and explanation of the invention.
Ausführungsform der Erfindung Embodiment of the invention
Die in Figur 1 dargestellte, erfindungsgemäße hydraulische Fahrzeugbremsanla- ge 1 weist einen Tandem-Hauptbremszylinder 2 auf, an den zwei Bremskreise I,The hydraulic Fahrzeugbremsanla- invention 1 shown in Figure 1, according to the invention comprises a tandem master cylinder 2, to the two brake circuits I,
II angeschlossen sind. Im Ausführungsbeispiel weist die Fahrzeugbremsanlage 1 vier Radbremsen mit Radbremszylindern 3 auf, die paarweise den beiden Bremskreisen I, II zugeordnet sind. Die Anzahl von vier Radbremsen und deren Zuordnung zu den Bremskreisen I, II ist nicht zwingend für die Erfindung. Die Fahrzeugbremsanlage 1 weist eine Kolbenpumpe 4 mit vier PumpenelementenII are connected. In the exemplary embodiment, the vehicle brake system 1 has four wheel brakes with wheel brake cylinders 3, which are assigned in pairs to the two brake circuits I, II. The number of four wheel brakes and their assignment to the brake circuits I, II is not mandatory for the invention. The vehicle brake system 1 has a piston pump 4 with four pump elements
5, d.h. für jeden Radbremszylinder 3 einem Pumpenelement 5, auf. Die Pumpenelemente 5 können auch als einzelne Kolbenpumpen aufgefasst werden. Im Ausführungsbeispiel sind die Pumpenelemente 5 sternförmig und mit einem Winkelversatz von jeweils 90° um einen Exzenter 6 herum angeordnet, der um eine Exzenterwelle 7 drehend antreibbar ist. Kolben 8 der Pumpenelemente 5 liegen mit Stirnflächen an einem Umfang des Exzenters 6 an und werden von Kolbenfedern 9 in Anlage am Umfang des Exzenters 6 gehalten. Ein Drehantrieb des Exzenters 6 treibt die Kolben 8 in an sich bekannter Weise zu einer hin- und hergehenden Hubbewegung an. 5, i. for each wheel brake cylinder 3 a pump element 5, on. The pump elements 5 can also be regarded as individual piston pumps. In the exemplary embodiment, the pump elements 5 are arranged in a star shape and with an angular offset of 90 ° around an eccentric 6 around which is rotatably driven about an eccentric shaft 7. Pistons 8 of the pump elements 5 bear with end faces on a circumference of the eccentric 6 and are held by piston springs 9 in abutment on the circumference of the eccentric 6. A rotary drive of the eccentric 6 drives the piston 8 in a conventional manner to a reciprocating stroke movement.
Die Kolben 5 sind doppelt wirkend, ihre einen Seiten sind an den Hauptbremszylinder 2 angeschlossen und an ihre andere Seiten sind über je ein Radventil 10 die Radbremszylinder 3 angeschlossen. Jedes Pumpenelement 5 weist ein Pumpenventil 1 1 auf, durch das die beiden Seiten seines Kolbens 8 verbindbar sind. Die Radventile 10 und die Pumpenventile 11 sind in ihrer stromlosenThe pistons 5 are double-acting, their one sides are connected to the master cylinder 2 and to their other sides are connected via a respective wheel valve 10, the wheel brake cylinder 3. Each pump element 5 has a pump valve 1 1, through which the two sides of its piston 8 are connectable. The wheel valves 10 and the pump valves 11 are in their de-energized
Grundstellung offene 2/2-Wege-Magnetventile. Zu einer Regelung der Radbremsdrücke in den Radbremszylindern 3 wird die Kolbenpumpe 4 angetrieben. Zum Aufbau oder zum Erhöhen des Radbremsdrucks werden die Radventile 10 während eines Förderhubs des jeweils zuge- ordneten Kolbens 8 geöffnet und während eines Saughubs geschlossen. DieBasic position open 2/2-way solenoid valves. For a regulation of the wheel brake pressures in the wheel brake cylinders 3, the piston pump 4 is driven. To build up or increase the wheel brake pressure, the wheel valves 10 are opened during a delivery stroke of the respective associated piston 8 and closed during a suction stroke. The
Radventile 10 offen und schließen also nicht gleichzeitig, sondern entsprechend des Phasenversatz der Pumpenelemente 5 nacheinander. Das gilt entsprechend auch für die Pumpenventile 11. Die Pumpenventile 1 1 werden gegensynchron zu den Radventilen 10 gesteuert, d.h. sie werden während des Förderhubs des zu- geordneten Kolbens 8 geschlossen und während des Saughubs geöffnet. AlsWheel valves 10 open and thus do not close at the same time, but according to the phase offset of the pump elements 5 in succession. This also applies to the pump valves 11. The pump valves 1 1 are controlled in opposition to the wheel valves 10, i. they are closed during the delivery stroke of the associated piston 8 and opened during the intake stroke. When
Förderhub wird der Hub eines der Kolben 8 bezeichnet, während dem der Kolben 8 Bremsflüssigkeit in Richtung der Radbremszylinder 3 verdrängt. Im Ausführungsbeispiel bewegt sich der Kolben 8 während des Förderhubs vom Exzenter 6 weg nach außen. Um die Stellung der Kolben 8 feststellen und die Ventile 10, 11 in Abhängigkeit von den Hüben der Kolben 8 steuern zu können weist die Fahrzeugbremsanlage 1 einen Pumpenstellungssensor 12 auf. Im Ausführungsbeispiel ist der Pumpenstellungssensor 12 ein Drehwinkelsensor, der einen Drehwinkel des Exzenters 6 misst. Während des Förderhubs saugen die Pumpenkolben 8 auf ihren dem Exzenter 6 zugewandten Seiten Bremsflüssigkeit aus dem Hauptbremszylinder 2 an. Beim Saughub, während dem die Radventile 10 geschlossen sind, strömt Bremsflüssigkeit durch die dann offenen Pumpenventile 11 von der Exzenterseite zur ex- zenterabgewandten Seite der Kolben 8 über, so dass sie beim darauffolgenden Förderhub bei geschlossenem Pumpenventil 11 durch das dann offene RadventilDelivery stroke is the stroke of one of the pistons 8, during which the piston 8 displaces brake fluid in the direction of the wheel brake cylinder 3. In the exemplary embodiment, the piston 8 moves away from the eccentric 6 during the delivery stroke. In order to determine the position of the piston 8 and to be able to control the valves 10, 11 as a function of the strokes of the pistons 8, the vehicle brake system 1 has a pump position sensor 12. In the exemplary embodiment, the pump position sensor 12 is a rotation angle sensor which measures a rotation angle of the eccentric 6. During the delivery stroke, the pump pistons 8 suck brake fluid from the master brake cylinder 2 on their sides facing the eccentric 6. During the suction stroke, during which the wheel valves 10 are closed, brake fluid flows through the then open pump valves 11 from the eccentric side to the eccentric side of the pistons 8 so that they pass through the then open wheel valve during the subsequent delivery stroke when the pump valve 11 is closed
10 in den jeweiligen Radbremszylinder 3 verdrängt wird. 10 is displaced in the respective wheel brake cylinder 3.
Zum Absenken der Radbremsdrücke in den Radbremszylindern 3 werden die Radventile 10 und die Pumpenventile 11 umgekehrt wie zum Erhöhen der Rad- bremsdrücke gesteuert, d.h. die Radventile 10 werden während des vom Exzenter 6 weg nach außen gerichteten Förderhubs geschlossen und während des nach innen zum Exzenter 6 gerichteten Saughubs geöffnet, so dass die Kolben 8 während des Saughubs Bremsflüssigkeit durch die offenen Radventile 10 aus den Radbremszylindern 3 saugen. Die Pumpenventile 11 werden während des Förderhubs geöffnet, so dass die Kolben 8 die zuvor aus den RadbremszylindernIn order to lower the wheel brake pressures in the wheel brake cylinders 3, the wheel valves 10 and the pump valves 11 are inversely controlled as for increasing the wheel brake pressures, i. the wheel valves 10 are closed during the discharge stroke directed away from the eccentric 6 and opened during the suction stroke directed inwards towards the eccentric 6, so that the pistons 8 draw brake fluid through the open wheel valves 10 from the wheel brake cylinders 3 during the suction stroke. The pump valves 11 are opened during the delivery stroke, so that the piston 8 previously from the wheel brake cylinders
3 angesaugte Bremsflüssigkeit auf die anderen, exzenterseitigen Kolbenseiten verdrängt wird und von dort zum Hauptbremszylinder 2 strömt. Während des zum Exzenter 6 gerichteten Saughubs der Kolben 8 sind die Pumpenventile 11 geschlossen, so dass die exzenterseitigen Seiten der Kolben 8 Bremsflüssigkeit in den Hauptbremszylinder 2 verdrängen. 3 sucked brake fluid on the other, eccentric piston sides is displaced and flows from there to the master cylinder 2. During the suction stroke of the pistons 8 directed towards the eccentric 6, the pump valves 11 are closed, so that the eccentric sides of the pistons 8 displace brake fluid into the master brake cylinder 2.
Um die Radbremsdrücke in den Radbremszylindern 3 nur wenig zu erhöhen oder abzusenken werden die Radventile 10 und die Pumpenventile 1 1 nicht während des gesamten Hubs geöffnet, sondern vergleichbar einer Phasenanschnittsteuerung nur während eines Teils des Hubs des jeweiligen Kolbens 8. In order to increase or decrease the wheel brake pressures in the wheel brake cylinders 3 only slightly, the wheel valves 10 and the pump valves 11 are not opened during the entire stroke, but comparable to a phase control only during part of the stroke of the respective piston 8.
Die Radventile 10 und die Pumpenventile 11 sind wie bereits gesagt in ihren stromlosen Grundstellungen offen, so dass die Radbremszylinder 3 durch die Radventile 10 und die Pumpenventile 1 1 mit dem Hauptbremszylinder 2 kommunizieren und die Fahrzeugbremsanlage 1 zu einer Betriebsbremsung oder zu ei- ner Hilfsbremsung bei einer Störung per Muskelkraft mit dem Hauptbremszylinder 2 betätigbar ist. Zu einer Hilfskraftbremsung kann der Hauptbremszylinder 2 einen an sich bekannten, nicht gezeichneten Bremskraftverstärker aufweisen. In oben beschriebener Weise ist eine Fremdkraft-Bremsung mit der Kolbenpumpe 4 möglich. Ebenfalls ist eine an sich bekannte, radindividuelle Schlupfregelung möglich. As already mentioned, the wheel valves 10 and the pump valves 11 are open in their currentless basic positions, so that the wheel brake cylinders 3 communicate with the master brake cylinder 2 through the wheel valves 10 and the pump valves 11 and the vehicle brake system 1 contributes to service braking or auxiliary braking a disorder by muscle power with the master cylinder 2 is actuated. To a power brake, the master cylinder 2 may have a known, not shown brake booster. In the manner described above, an external power braking with the piston pump 4 is possible. Likewise, a wheel-specific slip control known per se is possible.
Für eine Fremdkraftbremsung weist der Hauptbremszylinder 2 einen Pedalwegsimulator 13 mit einem ringförmigen Simulatorkolben 14 auf, der gegen eine Simulatorfeder 15 arbeitet. Durch Schließen eines Simulatorventils 16 zwischen ei- nem Bremsflüssigkeitsvorratsbehälter 17 und dem Hauptbremszylinder 2 wird einFor an external power brake, the master cylinder 2 has a pedal travel simulator 13 with an annular simulator piston 14 which operates against a simulator spring 15. By closing a simulator valve 16 between a brake fluid reservoir 17 and the master cylinder 2 is a
Bremsflüssigkeitsvolumen im Pedalwegsimulator 13 eingeschlossen, so dass sich der Simulatorkolben 14 bei einer Muskelkraftbetätigung des Hauptbremszylinders 2 mittels eines Bremspedals 18 verschiebt. Die Simulatorfeder 15 bewirkt in diesem Fall eine Pedalkraft am Bremspedal 18. Eine Kammer des Haupt- bremszylinders 2 wird im Falle einer Fremdkraftbremsung durch Öffnen einesBrake fluid volume included in the pedal travel simulator 13, so that the simulator piston 14 shifts in a muscle power operation of the master cylinder 2 by means of a brake pedal 18. The simulator spring 15 causes in this case a pedal force on the brake pedal 18. A chamber of the master cylinder 2 is in the case of a power brake by opening a
Entkopplungsventils 18, das diese Kammer des Hauptbremszylinders 2 mit dem Bremsflüssigkeitsvorratsbehälter 17 verbindet, drucklos geschaltet. Ein Bremsdruckaufbau erfolgt wie oben beschrieben mit der Kolbenpumpe 4. Decoupling valve 18, which connects this chamber of the master cylinder 2 with the brake fluid reservoir 17, depressurized. A brake pressure build-up takes place as described above with the piston pump 4.
In Figur 2 weisen die Pumpenelemente 5 der Kolbenpumpe 4 einfach wirkende Kolben 8 auf. Radbremszylinder 3 sind wie in Figur 1 über Radventile 10 an die Pumpenelemente 5 angeschlossen. Die Pumpenelemente 5 sind auf derselben Seite ihrer Kolben 8 wie die Radbremszylinder 3 über Pumpenventile 11 an den Hauptbremszylinder 2 angeschlossen. Ein Aufbau oder eine Erhöhung von Radbremsdrücken in den Radbremszylindern 3 erfolgt wie zu Figur 1 beschrieben, indem die Radventile 10 während des Förderhubs des zugeordneten Kolbens 8 geöffnet und die Pumpenventile 1 1 geschlossen und während des Saughubs umgekehrt die Radventile 10 geschlossen und die Pumpenventile 11 geöffnet werden. Während des Förderhubs verdrängt der jeweilige Kolben 8 Bremsflüssigkeit durch das während des Förderhubs offene Radventil 10 in den angeschlossenen Radbremszylinder 3, wobei er die Bremsflüssigkeit im vorangegangenen Saughub bei geschlossenem Radventil 10 durch das geöffnete Pumpenventil 1 1 angesaugt hat. Ein Absenken der Radbremsdrücke in den Radbremszylindern 3 erfolgt durch umgekehrtes Steuern der Ventile 10, 1 1 , es werden die Radventile 10 während des Förderhubs geschlossen und die Pumpenventile 11 geöffnet, so dass die Kolben 8 Bremsflüssigkeit durch die offenen Pumpenventile 1 1 in den Hauptbremszylinder 2 verdrängen. Während des Saughubs werden zum Absenken der Radbremsdrücke die Radventile 10 geöffnet und die Pumpenventile 11 geschlossen, so dass die Kolben 8 Bremsflüssigkeit aus den Radbremszylindern 3 ansaugen. In FIG. 2, the pump elements 5 of the piston pump 4 have single-acting pistons 8. Wheel brake cylinder 3 are as in Figure 1 via wheel valves 10 to the Pump elements 5 connected. The pump elements 5 are connected on the same side of their pistons 8 as the wheel brake cylinder 3 via pump valves 11 to the master cylinder 2. A construction or an increase of wheel brake pressures in the wheel brake cylinders 3 takes place as described for FIG. 1, by opening the wheel valves 10 during the delivery stroke of the associated piston 8 and closing the pump valves 11 and reversing the wheel valves 10 and opening the pump valves 11 during the intake stroke become. During the delivery stroke, the respective piston 8 displaces brake fluid through the open during the delivery stroke wheel valve 10 in the connected wheel brake cylinder 3, wherein he has sucked the brake fluid in the previous intake stroke with the wheel valve 10 closed by the open pump valve 1 1. Lowering of the wheel brake pressures in the wheel brake cylinders 3 takes place by reverse control of the valves 10, 11, the wheel valves 10 are closed during the delivery stroke and the pump valves 11 are opened, so that the pistons 8 brake fluid through the open pump valves 1 1 in the master cylinder. 2 displace. During the suction stroke, the wheel valves 10 are opened to lower the wheel brake pressures and the pump valves 11 are closed, so that the pistons 8 draw in brake fluid from the wheel brake cylinders 3.
Mit Ausnahme der erläuterten Unterschiede ist die hydraulische Fahrzeugbremsanlage 1 aus Figur 2 gleich aufgebaut und funktioniert in gleicher weise wie die Fahrzeugbremsanlage aus Figur 1. Zur Vermeidung von Wederholungen wird zur Erläuterung der Figur 2 ergänzend auf die Erläuterungen der Figur 1 verwiesen. Gleiche Bauteile haben in beiden Figuren gleiche Bezugszahlen. We zu Figur 1 gesagt kann zu einer Muskelkraftbremsung ein herkömmlicher Tandem- Hauptbremszylinder 2 ohne Pedalwegsimulator 13 Verwendung finden, zu einer Hilfskraftbremsung kann der Hauptbremszylinder 2 einen Bremskraftverstärker aufweisen (nicht dargestellt). With the exception of the explained differences, the hydraulic vehicle brake system 1 of Figure 2 is the same and works in the same way as the vehicle brake system of Figure 1. To avoid Wederholungen reference is made to explain Figure 2 in addition to the explanations of Figure 1. The same components have the same reference numbers in both figures. As can be seen from FIG. 1, a conventional tandem master cylinder 2 without pedal travel simulator 13 can be used for muscle braking, and the master brake cylinder 2 can have a brake booster for auxiliary power braking (not shown).

Claims

Ansprüche claims
1. Verfahren zur Regelung eines Radbremsdrucks in einem Radbremszylinder1. A method for controlling a wheel brake pressure in a wheel brake cylinder
(3) einer hydraulischen Fahrzeugbremsanlage (1), wobei die Fahrzeugbremsanlage (1) mindestens einen Radbremszylinder (3), eine Kolbenpumpe (4), die während der Regelung des Radbremsdrucks angetrieben wird, und ein Radventil (10) aufweist, über das der mindestens eine Radbremszylinder (3) an die Kolbenpumpe (4) angeschlossen ist, dadurch gekennzeichnet, dass zur Erhöhung des Radbremsdrucks während einer Regelung des Radbremsdrucks das Radventil (10) während eines Förderhubs der Kolbenpumpe (4) geöffnet und während eines Saughubs geschlossen ist. (3) a hydraulic vehicle brake system (1), wherein the vehicle brake system (1) at least one wheel brake cylinder (3), a piston pump (4) which is driven during the control of the wheel brake pressure, and a wheel valve (10) via which the at least a wheel brake cylinder (3) is connected to the piston pump (4), characterized in that the wheel valve (10) is opened during a delivery stroke of the piston pump (4) and closed during a suction stroke to increase the wheel brake pressure during a regulation of the wheel brake pressure.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass zu einem Absenken des Radbremsdrucks während einer Regelung des Radbremsdrucks das Radventil (10) während eines Förderhubs der Kolbenpumpe (4) geschlossen und während des Saughubs geöffnet ist. 2. The method according to claim 1, characterized in that to lower the wheel brake pressure during a regulation of the wheel brake pressure, the wheel valve (10) during a delivery stroke of the piston pump (4) is closed and opened during the suction stroke.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass der mindestens eine Radbremszylinder (3) ausschließlich über das Radventil (10) an die Kolbenpumpe (4) angeschlossen ist. 3. The method according to claim 1, characterized in that the at least one wheel brake cylinder (3) exclusively via the wheel valve (10) to the piston pump (4) is connected.
4. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Kolbenpumpe (4) einen Pumpenstellungssensor (12) aufweist. 4. The method according to claim 1, characterized in that the piston pump (4) has a pump position sensor (12).
5. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Fahrzeugbremsanlage (1) einen Hauptbremszylinder (2) aufweist, an den die Kolbenpumpe (4) angeschlossen ist. 5. The method according to claim 1, characterized in that the vehicle brake system (1) has a master cylinder (2) to which the piston pump (4) is connected.
6. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Kolbenpumpe (4) doppelt wirkende Kolben (8) aufweist, dass der mindestens eine Radbremszylinder (3) über das Radventil (10) an eine Seite des Kolbens (8) und die andere Seite des Kolbens (8) an den Hauptbremszylinder (2) angeschlossen ist, und dass die beiden Seiten des Kolbens (8) der Kolbenpumpe6. The method according to claim 1, characterized in that the piston pump (4) has double-acting piston (8) that the at least one wheel brake cylinder (3) via the wheel valve (10) to one side of the piston (8) and the other side of the piston (8) is connected to the master cylinder (2), and that the two sides of the piston (8) of the piston pump
(4) durch ein Pumpenventil (11) miteinander verbunden sind. (4) are interconnected by a pump valve (11).
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass das Pumpenventil (1 1) gegensynchron zum Radventil (10) betätigt wird. 7. The method according to claim 6, characterized in that the pump valve (1 1) is operated counter-synchronously to the wheel valve (10).
8. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass das Radventil (10) und das Pumpenventil (1 1) geöffnet sind, wenn kein Radbremsdruck geregelt wird. 8. The method according to claim 6, characterized in that the wheel valve (10) and the pump valve (1 1) are opened when no wheel brake pressure is controlled.
9. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Kolbenpumpe (4) über ein Pumpenventil (11) an den Hauptbremszylinder (2) angeschlossen ist, das zur Regelung des Radbremsdrucks gegensynchron zum Radventil (10) betätigt wird. 9. The method according to claim 1, characterized in that the piston pump (4) via a pump valve (11) to the master cylinder (2) is connected, which is operated to control the wheel brake counter-synchronized to the wheel valve (10).
10. Verfahren nach Anspruch 9, dadurch gekennzeichnet, dass das Radventil (10) und das Pumpenventil (1 1) geöffnet sind, wenn kein Radbremsdruck geregelt wird. 10. The method according to claim 9, characterized in that the wheel valve (10) and the pump valve (1 1) are opened when no wheel brake pressure is controlled.
EP11773279.2A 2010-12-23 2011-10-25 Method for controlling a wheel brake pressure in a hydraulic vehicle braking system Withdrawn EP2655142A1 (en)

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DE102010064035A DE102010064035A1 (en) 2010-12-23 2010-12-23 Method for controlling a wheel brake pressure of a hydraulic vehicle brake system
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WO2012084308A1 (en) 2012-06-28
CN103269924A (en) 2013-08-28
US9216723B2 (en) 2015-12-22

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