EP2396201A1 - Method for operating a hydraulic vehicle braking system - Google Patents

Method for operating a hydraulic vehicle braking system

Info

Publication number
EP2396201A1
EP2396201A1 EP09795750A EP09795750A EP2396201A1 EP 2396201 A1 EP2396201 A1 EP 2396201A1 EP 09795750 A EP09795750 A EP 09795750A EP 09795750 A EP09795750 A EP 09795750A EP 2396201 A1 EP2396201 A1 EP 2396201A1
Authority
EP
European Patent Office
Prior art keywords
brake
vehicle
master cylinder
valves
wheel
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Withdrawn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
EP09795750A
Other languages
German (de)
French (fr)
Inventor
Herbert Vollert
Remy Garnier
Reinhard Weiberle
Timo Jahnz
Volker Mehl
Frank Kneip
Dirk Mahnkopf
Jens Kolarsky
Stephan Hoenle
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 EP2396201A1 publication Critical patent/EP2396201A1/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Withdrawn legal-status Critical Current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
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/321—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration deceleration
    • B60T8/3255—Systems in which the braking action is dependent on brake pedal data
    • B60T8/326—Hydraulic systems
    • B60T8/3265—Hydraulic systems with control of the booster
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • 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
    • B60T13/74—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 electrical assistance or drive
    • 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
    • B60T13/74—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 electrical assistance or drive
    • B60T13/745—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 electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
    • 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
    • B60T8/36—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 including a pilot valve responding to an electromagnetic force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
    • B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
    • B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
    • B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
    • B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems

Definitions

  • the invention relates to a method for operating a hydraulic vehicle brake system, which has a master cylinder with an electromechanical brake booster, with the features of the preamble of claim 1.
  • such a hydraulic vehicle brake system which is conventional construction, with the exception of the brake booster.
  • the vehicle brake system has a dual-circuit master cylinder, to which four wheel brakes, divided into two brake circuits, are connected.
  • a two-circuit vehicle brake system is not mandatory for the invention, nor the number of brake circuits and the wheel brakes.
  • the known vehicle brake system has a wheel slip control device, for the designations such as (brake) anti-lock, drive slip, vehicle dynamics and / or stability control device and the abbreviations such as ABS, ASR, FDR, ESP are common.
  • the hydraulic part of the Radschlupfregel comprises for each wheel brake pressure build-up valve and a Bremsdruckabsenkventil and for each brake circuit, a hydraulic pump, a separating valve with which the master cylinder is hydraulically separated from the brake circuit, and an intake valve, through which the master cylinder for the purpose of rapid braking pressure build-up with a suction side the hydraulic pump is connectable, has.
  • a hydraulic pump for each wheel brake pressure build-up valve and a Bremsdruckabsenkventil and for each brake circuit, a hydraulic pump, a separating valve with which the master cylinder is hydraulically separated from the brake circuit, and an intake valve, through which the master cylinder for the purpose of rapid braking pressure build-up with a suction side the hydraulic pump is connectable, has.
  • the known vehicle brake system has an electromechanical brake booster with a hollow brake wave electric motor whose rotor has a nut of a spindle drive, which converts the rotary drive movement of the electric motor in a translational movement for actuating the master cylinder.
  • the brake booster may have a rack gear possibly with a screw for driving the rack, to implement the rotary drive movement of an electric motor in a translational movement to actuation of the master cylinder.
  • An electromechanical brake booster with a linear motor, an electric magnet or a piezoelement can also be used for the method according to the invention. The list is not exhaustive.
  • the vehicle brake system is an auxiliary power brake system, i. an actuating force to actuate the master cylinder is applied in part as muscle power of a driver and the rest as a foreign force from the electromechanical brake booster. Also conceivable is an operation as a foreign-power brake system, in which the actuation force is generated exclusively as a foreign force by the brake booster and a force exerted by a driver for braking effort muscle power or an executed by the driver actuating stroke as a target for controlling or regulating than
  • the method according to the invention with the features of claim 1 provides, close here as Tranventil valve, which is arranged between the master cylinder and the at least one wheel brake of the vehicle brake system to maintain a prevailing in the at least one wheel brake wheel brake and thus a braking force to obtain.
  • An applied braking force can be maintained without having to energize the electromechanical brake booster.
  • the brake booster is thereby thermally relieved and reduced electrical load on an electrical system of a vehicle.
  • Claim 2 provides a parking brake function, which is also referred to as a parking brake function.
  • the isolation valve is closed only when the vehicle is stationary, according to the embodiment of claim 3, when a parking brake pressure prevails in the vehicle brake system.
  • Parking brake pressure is the hydraulic pressure that is necessary and sufficient to keep the stationary vehicle stationary, even on a slope or downhill. The vehicle is thereby kept at a standstill, even if it is parked on a slope.
  • the parking brake pressure required for this purpose depends inter alia on the vehicle, in particular its weight, the vehicle brake system itself and possibly also on changing parameters such as, for example, a temperature of the at least one wheel brake.
  • the vehicle brake system can be used as a parking brake system, without the electromechanical brake booster must be energized to maintain a braking force.
  • Claim 4 provides to use the existing isolation valves of a wheel slip control device, so that no additional construction and installation effort is necessary.
  • the isolation valves of all brake circuits, some brake circuits or a brake circuit can be closed to maintain the wheel brake pressure.
  • At least one valve is provided as a separating valve between the master cylinder and the at least one wheel brake.
  • FIGURE shows a hydraulic circuit diagram of a hydraulic vehicle brake system for carrying out the method according to the invention.
  • the inventive hydraulic vehicle brake system 1 shown in the drawing has a slip control device 12 (anti-lock control
  • she is designed as a dual-circuit brake system with two brake circuits I, Il, which are connected to a master cylinder 2.
  • Each brake circuit I, Il is connected via a separating valve 3 to the master cylinder 2.
  • the separating valves 3 are in their currentless basic position open 2/2-way solenoid valves.
  • the separating valves 3 are each a hydraulically connected in parallel from the master cylinder 2 to wheel brakes 4 check valve 5.
  • each brake circuit I, Il are connected via brake pressure build-up valves 6.
  • the brake pressure build-up valves 6 are in their currentless home position open 2/2-way solenoid valves. They are non-return valves 7 connected in parallel, by the wheel brakes 4 in the direction of
  • Master cylinder 2 can be flowed through.
  • a brake pressure reduction valve 8 is connected, which are connected together to a suction side of a hydraulic pump 9.
  • the brake pressure reduction valves 8 are designed as 2/2-way solenoid valves closed in their currentless basic position.
  • a pressure side of the hydraulic pump 9 is connected between the brake pressure buildup valves 6 and the isolation valves 3, d. H. the pressure side of the hydraulic pump 9 is connected via the brake pressure build-up valves 6 with the wheel brakes 4 and via the separating valve 3 to the master cylinder 2.
  • the brake pressure buildup valves 6 and the brake pressure lowering valves 8 are for better controllability
  • Each of the two brake circuits I, Il has a hydraulic pump 9, which are drivable together with an electric motor 10.
  • the suction sides of the hydraulic pumps 9 are connected to the brake pressure lowering valves 8.
  • hydraulic accumulator 1 1 for receiving and temporary storage of brake fluid are present, which flows out of the wheel brakes 4 by opening the Bremstikabsenkventile 8 during a slip control.
  • the brake pressure build-up valves 6 and the brake pressure reduction valves 8 form wheel brake pressure modulation valve arrangements with which a wheel-specific brake pressure control for a wheel slip control in a manner known per se and not explained here is possible with the hydraulic pump 9 driven.
  • the separating Valves 3 are closed in a wheel slip control, ie the vehicle brake system 1 is hydraulically separated from the master cylinder 2.
  • suction valve 19 in each brake circuit I Il the suction side of the hydraulic pump 9 with the master cylinder 2 is connectable.
  • the intake valves 19 are in their normally closed normal position closed 2/2-way solenoid valves. Become
  • the master cylinder 2 has an electromechanical brake booster 13, which generates an external force by means of an electric motor 14, which actuates the master cylinder 2 together with a muscular force which is applied via a brake pedal 15.
  • the symbolically represented electric motor 14 is integrated in the brake booster 13.
  • the electric motor 14 may be a rotary motor whose rotational movement is reduced by a gear and converted into a translational movement for actuating the master cylinder 2. It is also an embodiment of the brake booster 13 with an electric linear motor or an electromagnet possible. The list is not exhaustive.
  • an electronic control unit 16 is present. With a force sensor 17, a pedal force exerted on the brake pedal 15 and with a displacement sensor 18 a position of the brake pedal 15 can be measured.
  • the separating valves 3 are closed when actuated vehicle brake system 1 in order to maintain a built up by actuation of the master cylinder 2 Radbremstik and thus a braking force of the vehicle brake system 1, without the electric motor 14 of the brake booster 13 must be energized.
  • the electric motor 14 is thermally relieved and reduces a current load of an electrical system of a vehicle equipped with the vehicle brake system 1 motor vehicle. If the vehicle brake system 1, the wheel slip control device described
  • the isolation valves 3 are present, so that the inventive Process requires no additional components, but uses the existing isolation valves 3.
  • the method according to the invention can be used in order to keep a braking force applied by actuation of the master brake cylinder 2 constant, for example when driving downhill, without having to energize the electric motor 14 of the brake booster 13.
  • a parking brake function which is often referred to as a parking brake function, usable, i. E. in order to keep a stationary motor vehicle equipped with the vehicle brake system 1 at a standstill:
  • the isolation valves 3 are closed when the vehicle is at a standstill.
  • the isolation valves 3 are closed when a parking brake pressure has been established by operation of the master cylinder 2.
  • the parking brake pressure is a prevailing hydraulic pressure in the vehicle brake system 1, in particular in the wheel brakes 4, which is sufficient for the vehicle in the vehicle

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

Abstract

The invention relates to a method for operating a hydraulic vehicle braking system (1) having an electromechanical brake booster (13, 14). According to the invention, a shut-off valve (3) that is located between a brake master cylinder (2) and wheel brakes (4) is closed to maintain a wheel-brake pressure and thus a braking force. To maintain a constant braking force, no current must be applied to an electric motor (14) of the brake booster (13). The vehicle braking system (1) can be used as a parking brake. The shut-off valve (3) is present if the vehicle braking system (1) has an anti-lock control device (12).

Description

Beschreibung description
Titeltitle
Verfahren zum Betrieb einer hydraulischen FahrzeuqbremsanlaqeMethod for operating a hydraulic Fahrzeugbrqbremsanlaqe
Stand der TechnikState of the art
Die Erfindung betrifft ein Verfahren zum Betrieb einer hydraulischen Fahrzeugbremsanlage, die einen Hauptbremszylinder mit einem elektromechanischen Bremskraftverstärker aufweist, mit den Merkmalen des Oberbegriffs des An- Spruchs 1.The invention relates to a method for operating a hydraulic vehicle brake system, which has a master cylinder with an electromechanical brake booster, with the features of the preamble of claim 1. An.
Aus der Offenlegungsschrift DE 103 27 553 A1 ist eine derartige hydraulische Fahrzeugbremsanlage bekannt, die mit Ausnahme des Bremskraftverstärkers herkömmlicher Bauart ist. Die Fahrzeugbremsanlage weist einen Zweikreis- Hauptbremszylinder auf, an den vier Radbremsen, aufgeteilt in zwei Bremskreise, angeschlossen sind. Eine Zweikreis-Fahrzeugbremsanlage ist für die Erfindung nicht zwingend, ebenso wenig die Anzahl der Bremskreise und der Radbremsen. Zudem weist die bekannte Fahrzeugbremsanlage eine Radschlupfregeleinrichtung auf, für die Bezeichnungen wie (Brems-) Blockierschutz-, An- triebsschlupf-, Fahrdynamik- und/oder Stabilitätsregeleinrichtung sowie die Abkürzungen wie ABS, ASR, FDR, ESP gebräuchlich sind. Der hydraulische Teil der Radschlupfregeleinrichtung umfasst für jede Radbremse ein Bremsdruckaufbauventil und ein Bremsdruckabsenkventil sowie für jeden Bremskreis eine Hydropumpe, ein Trennventil, mit dem der Hauptbremszylinder hydraulisch vom Bremskreis trennbar ist, und ein Ansaugventil, durch das der Hauptbremszylinder zum Zwecke eines schnellen Bremsdruckaufbaus mit einer Saugseite der Hydropumpe verbindbar ist, aufweist. Solche Radschlupfregeleinrichtungen und ihre Funktionsweise sind an sich bekannt und sollen an dieser Stelle nicht näher erläutert werden.From the published patent application DE 103 27 553 A1, such a hydraulic vehicle brake system is known, which is conventional construction, with the exception of the brake booster. The vehicle brake system has a dual-circuit master cylinder, to which four wheel brakes, divided into two brake circuits, are connected. A two-circuit vehicle brake system is not mandatory for the invention, nor the number of brake circuits and the wheel brakes. In addition, the known vehicle brake system has a wheel slip control device, for the designations such as (brake) anti-lock, drive slip, vehicle dynamics and / or stability control device and the abbreviations such as ABS, ASR, FDR, ESP are common. The hydraulic part of the Radschlupfregeleinrichtung comprises for each wheel brake pressure build-up valve and a Bremsdruckabsenkventil and for each brake circuit, a hydraulic pump, a separating valve with which the master cylinder is hydraulically separated from the brake circuit, and an intake valve, through which the master cylinder for the purpose of rapid braking pressure build-up with a suction side the hydraulic pump is connectable, has. Such wheel slip control devices and their operation are known per se and will not be explained in detail at this point.
Anstelle eines Unterdruck-Bremskraftverstärkers weist die bekannte Fahrzeugbremsanlage einen elektromechanischen Bremskraftverstärker mit einem Hohl- wellen-Elektromotor auf, dessen Rotor eine Mutter eines Spindeltriebs aufweist, welcher die rotatorische Antriebsbewegung des Elektromotors in eine translatorische Bewegung zur Betätigung es Hauptbremszylinders umsetzt. Andere Konstruktionen eines elektromechanischen Bremskraftverstärkers sind für die Er- findung möglich, beispielsweise kann der Bremskraftverstärker ein Zahnstangengetriebe evtl. mit einer Schnecke zum Antrieb der Zahnstange, zur Umsetzung der rotatorischen Antriebsbewegung eines Elektromotors in eine translatorische Bewegung zu Betätigung des Hauptbremszylinders aufweisen. Auch ein elektromechanischer Bremskraftverstärker mit einem Linearmotor, einem Elekt- romagneten oder einem Piezoelement ist für das erfindungsgemäße Verfahren verwendbar. Die Aufzählung ist nicht abschließend.Instead of a vacuum brake booster, the known vehicle brake system has an electromechanical brake booster with a hollow brake wave electric motor whose rotor has a nut of a spindle drive, which converts the rotary drive movement of the electric motor in a translational movement for actuating the master cylinder. Other constructions of an electromechanical brake booster are possible for the invention, for example, the brake booster may have a rack gear possibly with a screw for driving the rack, to implement the rotary drive movement of an electric motor in a translational movement to actuation of the master cylinder. An electromechanical brake booster with a linear motor, an electric magnet or a piezoelement can also be used for the method according to the invention. The list is not exhaustive.
Die Fahrzeugbremsanlage ist eine Hilfskraft-Bremsanlage, d.h. eine Betätigungskraft zu Betätigung des Hauptbremszylinders wird zum Teil als Muskelkraft von einem Fahrzeugführer aufgebracht und im übrigen als Fremdkraft vom elektromechanischen Bremskraftverstärker. Denkbar ist auch ein Betrieb als Fremd- kraftbremsanlage, bei der die Betätigungskraft ausschließlich als Fremdkraft vom Bremskraftverstärker erzeugt wird und eine von einem Fahrzeugführer zur Bremsbetätigung ausgeübte Muskelkraft oder auch ein vom Fahrzeugführer aus- geführter Betätigungsweg als Sollgröße zur Steuerung oder Regelung der alsThe vehicle brake system is an auxiliary power brake system, i. an actuating force to actuate the master cylinder is applied in part as muscle power of a driver and the rest as a foreign force from the electromechanical brake booster. Also conceivable is an operation as a foreign-power brake system, in which the actuation force is generated exclusively as a foreign force by the brake booster and a force exerted by a driver for braking effort muscle power or an executed by the driver actuating stroke as a target for controlling or regulating than
Fremdkraft bezeichneten Kraft des Bremskraftverstärkers dient.Foreign force designated force of the brake booster is used.
Offenbarung der ErfindungDisclosure of the invention
Das erfindungsgemäße Verfahren mit den Merkmalen des Anspruchs 1 sieht vor, ein hier als Tranventil bezeichnetes Ventil, das zwischen dem Hauptbremszylinder und der mindestens einen Radbremse der Fahrzeugbremsanlage angeordnet ist, zu schließen, um einen in der mindestens einen Radbremse herrschenden Radbremsdruck und damit eine Bremskraft aufrecht zu erhalten. Eine aufgebrachte Bremskraft lässt sich dadurch aufrecht erhalten ohne den elektromechanischen Bremskraftverstärker bestromen zu müssen. Der Bremskraftverstärker wird dadurch thermisch entlastet und eine elektrische Belastung eines elektrischen Bordnetz eines Fahrzeugs verringert.The method according to the invention with the features of claim 1 provides, close here as Tranventil valve, which is arranged between the master cylinder and the at least one wheel brake of the vehicle brake system to maintain a prevailing in the at least one wheel brake wheel brake and thus a braking force to obtain. An applied braking force can be maintained without having to energize the electromechanical brake booster. The brake booster is thereby thermally relieved and reduced electrical load on an electrical system of a vehicle.
Die Unteransprüche haben vorteilhafte Ausgestaltungen und Weiterbildungen der im Anspruch 1 angegebenen Erfindung zum Gegenstand. Anspruch 2 sieht eine Feststellbremsfunktion vor, die auch als Parkbremsfunktion bezeichnet wird. Das Trennventil wird nur bei Fahrzeugstillstand geschlossen, gemäß der Weiterbildung des Anspruchs 3, wenn ein Parkbrems- druck in der Fahrzeugbremsanlage herrscht. Der Parkbremsdruck ist der hydraulische Druck, der notwendig und ausreichend ist, das stehende Fahrzeug, auch auf einer Steigung oder einem Gefälle, im Stillstand zu halten. Das Fahrzeug wird dadurch im Stillstand gehalten, auch wenn es an einer Schräge abgestellt ist. Der dazu erforderliche Parkbremsdruck ist u.a. vom Fahrzeug, insbesondere dessen Gewicht, der Fahrzeugbremsanlage selbst und eventuell auch von sich ändernden Parametern wie beispielsweise einer Temperatur der mindestens einen Radbremse abhängig. Die Fahrzeugbremsanlage lässt sich als Feststell- Bremsanlage verwenden, ohne dass der elektromechanische Bremskraftverstärker zur Aufrechterhaltung einer Bremskraft bestromt werden muss.The dependent claims have advantageous refinements and developments of the invention specified in claim 1 to the subject. Claim 2 provides a parking brake function, which is also referred to as a parking brake function. The isolation valve is closed only when the vehicle is stationary, according to the embodiment of claim 3, when a parking brake pressure prevails in the vehicle brake system. Parking brake pressure is the hydraulic pressure that is necessary and sufficient to keep the stationary vehicle stationary, even on a slope or downhill. The vehicle is thereby kept at a standstill, even if it is parked on a slope. The parking brake pressure required for this purpose depends inter alia on the vehicle, in particular its weight, the vehicle brake system itself and possibly also on changing parameters such as, for example, a temperature of the at least one wheel brake. The vehicle brake system can be used as a parking brake system, without the electromechanical brake booster must be energized to maintain a braking force.
Anspruch 4 sieht vor, die vorhandenen Trennventile einer Radschlupfregeleinrichtung zu verwenden, so dass kein zusätzlicher baulicher- und Montageaufwand notwendig ist. Bei einer Mehrkreis-Fahrzeugbremsanlage können die Trennventile aller Bremskreise, einiger Bremskreise oder eines Bremskreises geschlossen werden, um den Radbremsdruck aufrecht zu erhalten. Bei einerClaim 4 provides to use the existing isolation valves of a wheel slip control device, so that no additional construction and installation effort is necessary. In a multi-circuit vehicle brake system, the isolation valves of all brake circuits, some brake circuits or a brake circuit can be closed to maintain the wheel brake pressure. At a
Fahrzeugbremsanlage ohne Trennventile, also insbesondere ohne Radschlupfregeleinrichtung, ist mindestens ein Ventil als Trennventil zwischen dem Hauptbremszylinder und der mindestens einen Radbremse vorzusehen.Vehicle brake system without isolation valves, so in particular without Radschlupfregeleinrichtung, at least one valve is provided as a separating valve between the master cylinder and the at least one wheel brake.
Kurze Beschreibung der ZeichnungShort description of the drawing
Die Erfindung wird nachfolgend anhand einer in der Zeichnung dargestellten Ausführungsform näher erläutert. Die einzige Figur zeigt einen hydraulischen Schaltplan einer hydraulischen Fahrzeugbremsanlage zur Durchführung des er- findungsgemäßen Verfahrens.The invention will be explained in more detail with reference to an embodiment shown in the drawing. The sole FIGURE shows a hydraulic circuit diagram of a hydraulic vehicle brake system for carrying out the method according to the invention.
Ausführungsform der ErfindungEmbodiment of the invention
Die in der Zeichnung dargestellte erfindungsgemäße hydraulische Fahrzeug- bremsanlage 1 weist eine Schlupfregeleinrichtung 12 (BlockierschutzregelungThe inventive hydraulic vehicle brake system 1 shown in the drawing has a slip control device 12 (anti-lock control
ABS; Antriebsschlupfregelung ASR; Fahrdynamikregelung FDR, ESP) auf. Sie ist als Zweikreisbremsanlage mit zwei Bremskreisen I, Il ausgebildet, die an einen Hauptbremszylinder 2 angeschlossen sind. Jeder Bremskreis I, Il ist über ein Trennventil 3 an den Hauptbremszylinder 2 angeschlossen. Die Trennventile 3 sind in ihrer stromlosen Grundstellung offene 2/2-Wege-Magnetventile. Den Trennventilen 3 ist jeweils ein vom Hauptbremszylinder 2 zu Radbremsen 4 durchströmbares Rückschlagventil 5 hydraulisch parallel geschaltet. An das Trennventil 3 jedes Bremskreis I, Il sind die Radbremsen 4 über Bremsdruckaufbauventile 6 angeschlossen. Die Bremsdruckaufbauventile 6 sind in ihrer stromlosen Grundstellung offene 2/2-Wege-Magnetventile. Ihnen sind Rück- schlagventile 7 parallel geschaltet, die von den Radbremsen 4 in Richtung zumSECTION; Traction control ASR; Vehicle dynamics control FDR, ESP). she is designed as a dual-circuit brake system with two brake circuits I, Il, which are connected to a master cylinder 2. Each brake circuit I, Il is connected via a separating valve 3 to the master cylinder 2. The separating valves 3 are in their currentless basic position open 2/2-way solenoid valves. The separating valves 3 are each a hydraulically connected in parallel from the master cylinder 2 to wheel brakes 4 check valve 5. At the separating valve 3 each brake circuit I, Il the wheel brakes 4 are connected via brake pressure build-up valves 6. The brake pressure build-up valves 6 are in their currentless home position open 2/2-way solenoid valves. They are non-return valves 7 connected in parallel, by the wheel brakes 4 in the direction of
Hauptbremszylinder 2 durchströmbar sind.Master cylinder 2 can be flowed through.
An jede Radbremse 4 ist ein Bremsdruckabsenkventil 8 angeschlossen, die gemeinsam an eine Saugseite einer Hydropumpe 9 angeschlossen sind. Die Bremsdruckabsenkventile 8 sind als in ihrer stromlosen Grundstellung ge- schlossene 2/2 -Wege-Magnetventile ausgebildet. Eine Druckseite der Hydropumpe 9 ist zwischen den Bremsdruckaufbauventilen 6 und den Trennventilen 3 angeschlossen, d. h. die Druckseite der Hydropumpe 9 ist über die Bremsdruckaufbauventile 6 mit den Radbremsen 4 und über das Trennventil 3 mit dem Hauptbremszylinder 2 verbunden. Die Bremsdruckaufbauventile 6 und die Bremsdruckabsenkventile 8 sind wegen der besseren Steuer- und RegelbarkeitTo each wheel brake 4, a brake pressure reduction valve 8 is connected, which are connected together to a suction side of a hydraulic pump 9. The brake pressure reduction valves 8 are designed as 2/2-way solenoid valves closed in their currentless basic position. A pressure side of the hydraulic pump 9 is connected between the brake pressure buildup valves 6 and the isolation valves 3, d. H. the pressure side of the hydraulic pump 9 is connected via the brake pressure build-up valves 6 with the wheel brakes 4 and via the separating valve 3 to the master cylinder 2. The brake pressure buildup valves 6 and the brake pressure lowering valves 8 are for better controllability
Proportionalventile.Proportional valves.
Jeder der beiden Bremskreise I, Il weist eine Hydropumpe 9 auf, die gemeinsam mit einem Elektromotor 10 antreibbar sind. Die Saugseiten der Hydropumpen 9 sind an die Bremsdruckabsenkventile 8 angeschlossen. Auf der Saugseite der Hydropumpen 9 sind Hydrospeicher 1 1 zur Aufnahme und Zwischenspeicherung von Bremsflüssigkeit vorhanden, die durch Öffnen der Bremsdruckabsenkventile 8 während einer Schlupfregelung aus den Radbremsen 4 ausströmt.Each of the two brake circuits I, Il has a hydraulic pump 9, which are drivable together with an electric motor 10. The suction sides of the hydraulic pumps 9 are connected to the brake pressure lowering valves 8. On the suction side of the hydraulic pumps 9 hydraulic accumulator 1 1 for receiving and temporary storage of brake fluid are present, which flows out of the wheel brakes 4 by opening the Bremsdruckabsenkventile 8 during a slip control.
Die Bremsdruckaufbauventile 6 und die Bremsdruckabsenkventile 8 bilden Rad- bremsdruckmodulationsventilanordnungen, mit denen bei angetriebener Hydropumpe 9 eine radindividuelle Bremsdruckregelung zu einer Radschlupfregelung in an sich bekannter und hier nicht zu erläuternder Weise möglich ist. Die Trenn- ventile 3 werden bei einer Radschlupfregelung geschlossen, d.h. die Fahrzeugbremsanlage 1 wird hydraulisch vom Hauptbremszylinder 2 getrennt.The brake pressure build-up valves 6 and the brake pressure reduction valves 8 form wheel brake pressure modulation valve arrangements with which a wheel-specific brake pressure control for a wheel slip control in a manner known per se and not explained here is possible with the hydraulic pump 9 driven. The separating Valves 3 are closed in a wheel slip control, ie the vehicle brake system 1 is hydraulically separated from the master cylinder 2.
Durch ein Ansaugventil 19 in jedem Bremskreis I, Il ist die Saugseite der Hydro- pumpe 9 mit dem Hauptbremszylinder 2 verbindbar. Die Ansaugventile 19 sind in ihrer stromlosen Grundstellung geschlossene 2/2-Wege-Magnetventile. WerdenBy a suction valve 19 in each brake circuit I, Il the suction side of the hydraulic pump 9 with the master cylinder 2 is connectable. The intake valves 19 are in their normally closed normal position closed 2/2-way solenoid valves. Become
Sie geöffnet, saugt die Hydropumpe 9 Bremsflüssigkeit unmittelbar aus demWhen opened, the hydraulic pump 9 sucks brake fluid directly out of the
Hauptbremszylinder 2, wodurch bei unbetätigtem Hauptbremszylinder 2 bzw. druckloser Fahrzeugbremsanlage 1 ein schnellerer Bremsdruckaufbau mit der Hydropumpe 9 möglich ist.Master cylinder 2, whereby a faster brake pressure build-up with the hydraulic pump 9 is possible with unoperated master cylinder 2 or unpressurized vehicle brake system 1.
Der Hauptbremszylinder 2 weist einen elektromechanischen Bremskraftverstärker 13 auf, der mit Hilfe eines Elektromotors 14 eine Fremdkraft erzeugt, die zusammen mit einer Muskelkraft, die über ein Bremspedal 15 aufgebracht wird, den Hauptbremszylinder 2 betätigt. Der symbolisch dargestellte Elektromotor 14 ist in den Bremskraftverstärker 13 integriert. Der Elektromotor 14 kann ein rotatorischer Motor sein, dessen Drehbewegung über ein Getriebe untersetzt und in eine translatorische Bewegung zur Betätigung des Hauptbremszylinders 2 gewandelt wird. Es ist auch eine Ausführung des Bremskraftverstärkers 13 mit einem Elektro-Linearmotor oder einem Elektromagneten möglich. Die Aufzählung ist nicht abschließend.The master cylinder 2 has an electromechanical brake booster 13, which generates an external force by means of an electric motor 14, which actuates the master cylinder 2 together with a muscular force which is applied via a brake pedal 15. The symbolically represented electric motor 14 is integrated in the brake booster 13. The electric motor 14 may be a rotary motor whose rotational movement is reduced by a gear and converted into a translational movement for actuating the master cylinder 2. It is also an embodiment of the brake booster 13 with an electric linear motor or an electromagnet possible. The list is not exhaustive.
Zur Steuerung oder Regelung der Fahrzeugbremsanlage 1 einschließlich des Bremskraftverstärkers 13 ist ein elektronisches Steuergerät 16 vorhanden. Mit einem Kraftsensor 17 ist eine auf das Bremspedal 15 ausgeübte Pedalkraft und mit einem Wegsensor 18 eine Stellung des Bremspedals 15 messbar.For controlling or regulating the vehicle brake system 1 including the brake booster 13, an electronic control unit 16 is present. With a force sensor 17, a pedal force exerted on the brake pedal 15 and with a displacement sensor 18 a position of the brake pedal 15 can be measured.
Gemäß dem erfindungsgemäßen Verfahren werden bei betätigter Fahrzeugbremsanlage 1 die Trennventile 3 geschlossen, um einen durch Betätigung des Hauptbremszylinders 2 aufgebauten Radbremsdruck und damit eine Bremskraft der Fahrzeugbremsanlage 1 aufrecht zu erhalten, ohne dass der Elektromotor 14 des Bremskraftverstärkers 13 bestromt werden muss. Der Elektromotor 14 wird thermisch entlastet und eine Strombelastung eines elektrischen Bordnetzes eines mit der Fahrzeugbremsanlage 1 ausgerüsteten Kraftfahrzeugs verringert. Sofern die Fahrzeugbremsanlage 1 die beschriebene RadschlupfregeleinrichtungAccording to the inventive method, the separating valves 3 are closed when actuated vehicle brake system 1 in order to maintain a built up by actuation of the master cylinder 2 Radbremsdruck and thus a braking force of the vehicle brake system 1, without the electric motor 14 of the brake booster 13 must be energized. The electric motor 14 is thermally relieved and reduces a current load of an electrical system of a vehicle equipped with the vehicle brake system 1 motor vehicle. If the vehicle brake system 1, the wheel slip control device described
12 aufweist, sind die Trennventile 3 vorhanden, so dass das erfindungsgemäße Verfahren keine zusätzlichen Bauteile erfordert, sondern die vorhandenen Trennventile 3 nutzt.12, the isolation valves 3 are present, so that the inventive Process requires no additional components, but uses the existing isolation valves 3.
Das erfindungsgemäße Verfahren kann genutzt werden, um eine durch Be- tätigung des Hauptbremszylinders 2 aufgebrachte Bremskraft beispielsweise bei einer Bergabfahrt konstant zu halten ohne den Elektromotor 14 des Bremskraftverstärkers 13 bestromen zu müssen. Auch ist die Verwendung des erfindungsgemäßen Verfahrens für eine Feststellbremsfunktion, die oft auch als Parkbremsfunktion bezeichnet wird, verwendbar, d.h. um ein mit der Fahrzeug- bremsanlage 1 ausgerüstetes, stehendes Kraftfahrzeug im Stillstand zu halten:The method according to the invention can be used in order to keep a braking force applied by actuation of the master brake cylinder 2 constant, for example when driving downhill, without having to energize the electric motor 14 of the brake booster 13. Also, the use of the inventive method for a parking brake function, which is often referred to as a parking brake function, usable, i. E. in order to keep a stationary motor vehicle equipped with the vehicle brake system 1 at a standstill:
Die Trennventile 3 werden bei Stillstand des Fahrzeugs geschlossen. Insbesondere werden die Trennventile 3 geschlossen, wenn durch Betätigung des Hauptbremszylinders 2 ein Parkbremsdruck aufgebaut worden ist. Der Parkbremsdruck ist ein in der Fahrzeugbremsanlage 1 , insbesondere in den Rad- bremsen 4 herrschender hydraulischer Druck, der ausreicht, das Fahrzeug imThe isolation valves 3 are closed when the vehicle is at a standstill. In particular, the isolation valves 3 are closed when a parking brake pressure has been established by operation of the master cylinder 2. The parking brake pressure is a prevailing hydraulic pressure in the vehicle brake system 1, in particular in the wheel brakes 4, which is sufficient for the vehicle in the vehicle
Stillstand zu halten, auch wenn das Fahrzeug auf einer Schräge abgestellt ist. Außer durch eine Hilfskraftbetätigung, bei der das Bremspedal 15 per Muskelkraft von einem Fahrzeugführer niedergetreten und zusätzlich eine als Fremdkraft bezeichnete Kraft vom Bremskraftverstärker 13 auf den Hauptbremszylinder 2 ausgeübt wird, kann der Parkbremsdruck für die Feststellbremsfunktion auch per Fremdkraft, also ausschließlich mit dem Bremskraftverstärker 13 und ohne Betätigung des Bremspedals 15 aufgebaut werden. Auch ist es möglich, nur eines der beiden Trennventile 3 zu schließen, so dass die Feststellbremsfunktion nur auf die Räder eines der beiden Bremskreise I, Il wirkt; das gilt nicht nur für die Feststellbremsfunktion, sondern ist auch bei einer Betriebsbremsung möglich. Standstill, even if the vehicle is parked on a slope. Except by an auxiliary power operation in which the brake pedal 15 by muscle force depressed by a driver and additionally exerted as a foreign force force is exerted by the brake booster 13 to the master cylinder 2, the parking brake for the parking brake function by external force, ie only with the brake booster 13 and be constructed without actuation of the brake pedal 15. It is also possible to close only one of the two separating valves 3, so that the parking brake function only acts on the wheels of one of the two brake circuits I, II; This not only applies to the parking brake function, but is also possible with a service brake.

Claims

Ansprüche claims
1 . Verfahren zum Betrieb einer hydraulischen Fahrzeugbremsanlage (1 ), die einen Hauptbremszylinder (2) mit einem elektromechanischen Bremskraftverstärker (13, 14), mindestens eine hydraulische Radbremse (4), die an den Hauptbremszylinder (2) angeschlossen ist, und ein Trennventil (3), das zwischen dem Hauptbremszylinder (2) und der Radbremse (4) angeordnet ist, aufweist, dadurch gekennzeichnet, dass das Trennventil (3) geschlossen wird, um einen Radbremsdruck aufrecht zu erhalten.1 . Method for operating a hydraulic vehicle brake system (1) comprising a master brake cylinder (2) with an electromechanical brake booster (13, 14), at least one hydraulic wheel brake (4) which is connected to the master brake cylinder (2), and an isolation valve (3) characterized in that the separating valve (3) is closed to maintain a wheel brake pressure.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Trenn- ventil (3) nur bei Fahrzeugstillstand geschlossen wird.2. The method according to claim 1, characterized in that the separating valve (3) is closed only when the vehicle is stationary.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass das Trennventil (3) nur geschlossen wird, wenn ein Parkbremsdruck in der Fahrzeugbremsanlage (1 ) herrscht.3. The method according to claim 2, characterized in that the separating valve (3) is only closed when a parking brake pressure in the vehicle brake system (1) prevails.
4. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass die Fahr- zeugbremsanlage (1 ) eine Radschlupfregeleinrichtung (12) aufweist, die das4. The method according to claim 1, characterized in that the vehicle brake system (1) has a wheel slip control device (12), the
Trennventil (3) aufweist. Separating valve (3).
EP09795750A 2009-02-11 2009-12-14 Method for operating a hydraulic vehicle braking system Withdrawn EP2396201A1 (en)

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DE102009000769A DE102009000769A1 (en) 2009-02-11 2009-02-11 Method for operating a hydraulic vehicle brake system
PCT/EP2009/067074 WO2010091758A1 (en) 2009-02-11 2009-12-14 Method for operating a hydraulic vehicle braking system

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EP (1) EP2396201A1 (en)
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US20120161507A1 (en) 2012-06-28
CN102307761A (en) 2012-01-04

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