WO2001014189A1 - Brake system and method for operating the same - Google Patents

Brake system and method for operating the same Download PDF

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Publication number
WO2001014189A1
WO2001014189A1 PCT/EP2000/008192 EP0008192W WO0114189A1 WO 2001014189 A1 WO2001014189 A1 WO 2001014189A1 EP 0008192 W EP0008192 W EP 0008192W WO 0114189 A1 WO0114189 A1 WO 0114189A1
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WO
WIPO (PCT)
Prior art keywords
brake
pressure
brake system
control
pressure gradient
Prior art date
Application number
PCT/EP2000/008192
Other languages
German (de)
French (fr)
Inventor
Jose Gonzalez
Thorsten Neu
Original Assignee
Continental Teves Ag & Co. Ohg
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
Priority claimed from DE10004183A external-priority patent/DE10004183A1/en
Application filed by Continental Teves Ag & Co. Ohg filed Critical Continental Teves Ag & Co. Ohg
Publication of WO2001014189A1 publication Critical patent/WO2001014189A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • 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
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • 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
    • B60T7/00—Brake-action initiating means
    • B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
    • 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
    • B60T8/3275—Systems with a braking assistant function, i.e. automatic full braking initiation in dependence of brake pedal velocity
    • 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
    • B60T8/4881—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems having priming means
    • 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
    • B60T8/88—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
    • B60T8/90—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 with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means using a simulated speed signal to test speed responsive control means
    • 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
    • B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
    • B60T2201/03—Brake assistants

Definitions

  • the invention relates to an anti-lock brake system for driving stability and / or traction control, in particular for motor vehicles, and to a method for operating such a brake system, which can be operated by the driver and / or by an external brake device, a brake pressure transmitter, a hydraulic unit connected between the brake pressure transmitter and the wheel brakes for wheel-specific brake pressure modulation on the wheel brakes and a control device for controlling the hydraulic unit and / or the third-party brake device depending on the operating and driving state variables detected by sensors.
  • Such a brake system is known for example from EP 0 770 012 B1.
  • a brake booster active booster equipped with an additional solenoid valve is described, which enables the brake pressure to be set independently of the driver by means of electrical control.
  • a so-called brake assistant BA can be implemented, which is able to recognize emergency braking situations and, if necessary, automatically by means of electrical control. to build up a maximum required braking force support.
  • An electrically controllable brake booster can not only be used for a brake assistant, but also for an electronic stability program (ESP) or Intelligent Cruise Control (ICC).
  • ESP electronic stability program
  • ICC Intelligent Cruise Control
  • the electrically controllable brake booster is used to ensure that the brake pressure builds up quickly, which is required for stabilization.
  • ICC pick-up appropriate external control of the brake booster can be used to perform a metered automatic braking to maintain a required safety distance from the person in front.
  • a brake assistant function can be activated, for example, if a determined pressure gradient exceeds a predetermined threshold value. At low temperatures (T ⁇ 10 C C), however, so high dynamic pressures can arise in the brake system that the pressure gradient during normal operation can exceed the trigger threshold for actuating the brake assistant.
  • a brake assistant can also be drawn via a displacement sensor, from the signals of which the speed of the brake pedal actuation is derived. Is by comparing the determined speed of actuation If an emergency braking situation is detected with a predefined speed threshold, the solenoid valve is activated to build up a maximum auxiliary power of the amplifier.
  • this speed threshold may be difficult to reach at low temperatures.
  • the object of the invention is to provide a brake system and em method for operating a brake system which enable the external brake device to function properly at all temperatures.
  • the invention provides that the control parameters of the external braking device are adapted as a function of the ambient temperature. This enables the functionality, the system dynamics and / or the noise behavior to be optimized.
  • the ambient temperature can therefore be deduced from the detected pressure gradient with a given electrical control of the external brake device and, for example, the triggering threshold of the third-party brake device can be adjusted accordingly.
  • the signals of a pressure sensor monitoring the master brake cylinder pressure can be used, which is included as standard in brake systems with an electronic stability program (ESP). No additional sensors are therefore required for brake systems with an ESP system.
  • ESP electronic stability program
  • the signals of a separate temperature sensor or one already provided in the vehicle could also be used to record the ambient temperature.
  • the measurement of the pressure gradient can take place during a check of the brake system, for example, after restarting the ignition, in which the electromagnet in the brake booster is controlled with a ramp-like increasing current or an increasing pulse width ratio and that to achieve a predetermined pressure (e.g. 5 bar) the required maximum current value I m a ⁇ or the maximum pulse width PWM max is determined.
  • a check is carried out, for example, in vehicles with an ESP system and booster pre-charging after each restart of the ignition.
  • the accuracy of the temperature detection can be improved in an advantageous manner by forming a product of the detected pressure gradient and the maximum current value I max or the maximum pulse width PWM max . Based this product can be concluded with a relatively high accuracy of the ambient temperature, especially in the interesting, lower temperature range.
  • a control of the external braking device that is adapted to the ambient temperature can thus be achieved without separate sensors, using the sensors that are present anyway.
  • the temperature can be adjusted, for example, by raising the pressure gradient threshold for triggering the third-party brake device at low temperatures or lowering the threshold for the speed of the brake pedal actuation to trigger a brake assistant function.
  • Such an adjustment is expediently carried out after restarting the ignition.
  • a check could also be carried out e.g. be repeated after a stop.
  • Fig. 1 is a schematic representation of a motor vehicle brake system
  • Fig. 2 em diagram for explaining a temperature detection by a test pulse when checking the brake system.
  • the motor vehicle brake system shown schematically in Fig. 1 consists essentially of a brake pressure sensor 1 which can be actuated and / or electrically controlled by the driver, a hydraulic unit 6 connected between the brake pressure sensor 1 and the wheel brakes 2, 3, 4 and 5 for a wheel-selective brake pressure modulation if required on the wheel brakes and a control device 7 for the electrical control of the hydraulic unit 6 and / or the brake pressure sensor 1 as a function of the operating and driving state variables detected by sensors.
  • the brake pressure transmitter 1 which can be actuated by the driver by means of a brake pedal 8, consists of a pneumatic brake booster 9, for example, which is followed by a master brake cylinder 10, which is preferably designed as a tandem master cylinder.
  • the pressure spaces of the master brake cylinder 10, which are not shown in detail, can be connected to a pressure medium reservoir 11.
  • the brake pedal 8 is coupled to an actuating rod 12 for actuating a control valve 13, which controls the build-up of a pneumatic differential pressure in the housing of the vacuum brake booster.
  • a brake light switch 15 that is operatively connected to the brake pedal 8 enables the driver to recognize that the brake booster 9 has been activated or that the electromagnet 14 is actuated. Adjust of the brake booster 9, the brake pedal 8 is carried along and thus the brake light switch 15 is reversed. An actuation of the brake booster 9 initiated by the driver can be detected by using a release switch 16.
  • the brake system shown in Fig. 1 has two identically constructed brake circuits I, II, so that the following description of one brake circuit also applies to the other.
  • the hydraulic unit 6 connected between the two pressure outlets of the main brake cylinder 10 and the hydraulic lines 6 leading to the wheel brakes 2, 3, 4, and 5 has an engine-pump unit which consists of a hydraulic recovery pump 17 driven by an electric motor, not shown , whose suction side is connected to one of the two pressure spaces of the master brake cylinder 10 via a first check valve 18 and an electromagnetically actuated switching valve 19. From the pressure side of the recovery pump 17, the pressure medium flows via a second check valve 20 and a steaming chamber 21 to a hydraulic node 22. Connected to this are both a line section 23 leading to the first wheel brake cylinder 2 and a line section 24 leading to the second wheel brake cylinder 3 Line 25 connects the pressure side of the recovery pump 17 to the tandem master cylinder 10.
  • a preferably electromagnetically actuated isolation valve 26 is connected between the node 22 and the master brake cylinder 10. which both a third check valve 27 and em pressure relief valve 28 are connected in parallel.
  • a parallel connection of an inlet valve 29 with a fourth check valve 30 and an outlet valve 31 are used to modulate the pressure applied in the first wheel brake cylinder 2, the aforementioned parallel connection being inserted in the line section 23 and the outlet valve 31 for the purpose of reducing the wheel brake pressure, a connection between the first wheel brake cylinder 2 and a low-pressure accumulator 32 enables, which is connected via a fifth check valve 33 to the suction side of the recovery pump 17.
  • a second parallel connection of a second inlet valve 34 with a sixth check valve 35 and a second outlet valve 36 are provided, the parallel connection mentioned in the line section 24 is inserted and the outlet valve 36 for the purpose of reducing the wheel brake pressure establishes a connection between the second wheel brake cylinder 38 and the low-pressure accumulator 32.
  • means for detecting the master brake cylinder pressures are provided in both brake circuits I, II, preferably by means of the first and second brake circuits I, II connected pressure sensors 37 and 38 are formed, the output signals together with further signals from sensors 39 to 42, which, for example, information about the
  • control parameters for the third-party brake device such as the triggering threshold for activating a brake assistant function
  • the control parameters for the third-party brake device can be adapted to the existing temperature conditions.
  • the solenoid 14 is controlled by a test pulse shown in FIG. 1 with a ramp-like current and the maximum current value I max required to achieve a predetermined pressure is detected
  • the test pulse can be used to derive the ambient temperature from the product of the pressure gradient and maximum current value I max .
  • the pressure gradient threshold for triggering external braking or the threshold for the actuation speed of the brake pedal to trigger a brake assistant function are adapted.

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

Abstract

The invention relates to an anti-locking brake system for realizing driving stability control and/or traction-slip control, especially for use in motor vehicles, and to a method for operating a brake system of this type. The inventive brake system contains a master cylinder (1) which can be actuated by the driver and/or by an auxiliary brake device (14), and a hydraulic unit (6) which is connected between the master cylinder (1) and the wheel brakes (2, 3, 4, 5) and which is provided for modulating the brake pressure, for each wheel, on the wheel brakes. The brake system also contains a control device (7) for controlling the hydraulic unit (6) and/or the auxiliary brake device (14) according to the operational state values and driving state values detected by sensors. In order to guarantee a function that is appropriate for the auxiliary brake device at all temperature values, the control parameters of the auxiliary brake device (14) can be adapted according to the ambient temperature.

Description

Bremsanlage und Verfahren zu deren Betrieb Brake system and method for its operation
Die Erfindung betrifft eine blockiergeschutzte Bremsanlage zur Fahrstabilitäts- und/oder Antriebsschlupfregelung, insbesondere für Kraftfahrzeuge, und em Verfahren zum Betrieb einer derartigen Bremsanlage, die einen durch den Fahrer und/oder durch eine Fremdbremseinrichtung betatigbaren Bremsdruckgeber, ein zwischen dem Bremsdruckgeber und die Radbremsen geschaltetes Hydroaggregat zur radindividuellen Bremsdruckmodulation an den Radbremsen und eine Steuereinrichtung zur Ansteuerung des Hydroaggregats und/oder der Fremdbremseinrichtung in Abhängigkeit von den durch Sensoren erfaßten Betriebs- und Fahrzustandsgroßen enthalt.The invention relates to an anti-lock brake system for driving stability and / or traction control, in particular for motor vehicles, and to a method for operating such a brake system, which can be operated by the driver and / or by an external brake device, a brake pressure transmitter, a hydraulic unit connected between the brake pressure transmitter and the wheel brakes for wheel-specific brake pressure modulation on the wheel brakes and a control device for controlling the hydraulic unit and / or the third-party brake device depending on the operating and driving state variables detected by sensors.
Eine derartige Bremsanlage ist z.B. aus der EP 0 770 012 Bl bekannt. Dort ist ein mit einem zusätzlichen Magnetventil ausgestatteter Bremskraftverstarker (aktiver Booster) beschrieben, der eine vom Fahrer unabhängige Einstellung des Bremsdruckes durch elektrische Ansteuerung ermöglicht. Dadurch kann u.a. ein sogenannter Bremsassistent (BA) realisiert werden, der m der Lage ist, Notbremssituationen zu erkennen und bei Bedarf durch elektrische Ansteuerung auto- matisch eine maximal erforderliche Bremskraftunterstutzung aufzubauen.Such a brake system is known for example from EP 0 770 012 B1. There, a brake booster (active booster) equipped with an additional solenoid valve is described, which enables the brake pressure to be set independently of the driver by means of electrical control. In this way, a so-called brake assistant (BA) can be implemented, which is able to recognize emergency braking situations and, if necessary, automatically by means of electrical control. to build up a maximum required braking force support.
Ein elektrisch ansteuerbarer Bremskraftverstarker ist allerdings nicht nur für einen Bremsassistenten, sondern auch für ein elektronisches Stabilitatsprogramm (ESP) oder Intelligent Cruise Control (ICC) verwendbar. Bei einem ESP- Eingπff wird der elektrisch ansteuerbare Bremskraftverstarker dazu benutzt, einen schnellen Bremsdruckaufbau sicherzustellen, der für die Stabilisierung erforderlich ist. Bei einem ICC-Emgriff kann durch entsprechene Fremdansteuerung des Bremskraftverstarker eine dosierte automatische Bremsung zur Beibehaltung eines erforderlichen Sicherheitsabstandes zum Vordermann durchgeführt werden.An electrically controllable brake booster can not only be used for a brake assistant, but also for an electronic stability program (ESP) or Intelligent Cruise Control (ICC). With an ESP input, the electrically controllable brake booster is used to ensure that the brake pressure builds up quickly, which is required for stabilization. With an ICC pick-up, appropriate external control of the brake booster can be used to perform a metered automatic braking to maintain a required safety distance from the person in front.
Bei herkömmlichen Bremsanlagen dieser Art ergibt sich allerdings die Problematik, daß sich die Ausloseparameter einer Fremdbremseinrichtung in Abhängigkeit von der Umgebungstemperatur verandern können. Eine Bremsassistentenfunktion kann z.B. aktiviert werden, wenn ein ermittelter Druckgradient einen vorgegebenen Schwellenwert übersteigt. Bei niedrigen Temperaturen (T < 10CC) können jedoch so große Staudrucke im Bremssystem entstehen, daß der Druckgradient bei einer Normalbetatigung die Ausloseschwelle für die Betätigung des Bremsassistenten überschreiten kann.In conventional brake systems of this type, however, there is the problem that the triggering parameters of a third-party brake device can change depending on the ambient temperature. A brake assistant function can be activated, for example, if a determined pressure gradient exceeds a predetermined threshold value. At low temperatures (T <10 C C), however, so high dynamic pressures can arise in the brake system that the pressure gradient during normal operation can exceed the trigger threshold for actuating the brake assistant.
Die Auslosung eines Bremsassistenten kann aber auch über einen Wegsensor erfolgen, aus dessen Signalen die Geschwindigkeit der Bremspedalbetatigung abgeleitet wird. Wird durch Vergleich der ermittelten Betatigungsgeschwmdigkeit mit einer vorgegebenen Geschwmdigkeitsschwelle eine Not- bremssituation erkannt, wird das Magnetventil zum Aufbau einer maximalen Hilfskraft des Verstärkers angesteuert. Es kann jedoch sein, daß diese Geschwmdigkeitsschwelle bei niedrigen Temperaturen nur schwer zu erreichen ist.A brake assistant can also be drawn via a displacement sensor, from the signals of which the speed of the brake pedal actuation is derived. Is by comparing the determined speed of actuation If an emergency braking situation is detected with a predefined speed threshold, the solenoid valve is activated to build up a maximum auxiliary power of the amplifier. However, this speed threshold may be difficult to reach at low temperatures.
Die Aufgabe der Erfindung ist es, eine Bremsanlage und em Verfahren zum Betrieb einer Bremsanlage zu schaffen, die bei allen Temperaturen eine ordnungsgemäße Funktion der Fremdbremseinrichtung ermöglichen.The object of the invention is to provide a brake system and em method for operating a brake system which enable the external brake device to function properly at all temperatures.
Diese Aufgabe wird erfmdungsgemaß durch die Merkmale der unabhängigen Patentansprüche gelost. In den abhangigen Patentansprüchen sind zweckmäßige Ausfuhrungsformen und vorteilhafte Weiterbildungen der Erfindung angegeben.According to the invention, this object is achieved by the features of the independent claims. Appropriate embodiments and advantageous developments of the invention are specified in the dependent claims.
Die Erfindung sieht vor, daß die Ansteuerparameter der Fremdbremseinrichtung in Abhängigkeit von der Umgebungstemperatur angepaßt werden. Dadurch kann die Funktionalltat, die Systemdynamik und/oder das Gerauschverhalten optimiert werden .The invention provides that the control parameters of the external braking device are adapted as a function of the ambient temperature. This enables the functionality, the system dynamics and / or the noise behavior to be optimized.
Da bei niedriger Temperatur die Viskosität der Bremsflüssigkeit exponentiell ansteigt, wirkt sich dies auf die Steiflgkeit des Bremssystems aus. Dies kann anhand des Druckgradienten gemessen werden, der dann ein Maß für die Umgebungstemperatur darstellt. Aus dem erfaßten Druckgradienten bei einer vorgegebenen elektrischen Ansteuerung der Fremdbremseinrichtung kann daher in einer besonders zweckmäßigen Ausfuhrung auf die Umgebungstemperatur geschlossen und z.B. die Ausloseschwelle der Fremdbremseinrichtung entsprechend angepaßt werden.Since the viscosity of the brake fluid increases exponentially at low temperatures, this affects the stiffness of the brake system. This can be measured using the pressure gradient, which then represents a measure of the ambient temperature. In a particularly expedient embodiment, the ambient temperature can therefore be deduced from the detected pressure gradient with a given electrical control of the external brake device and, for example, the triggering threshold of the third-party brake device can be adjusted accordingly.
Zur Erfassung des Druckgradienten können die Signale eines den Hauptbremszylinderdruck überwachenden Drucksensors verwendet werden, der bei Bremsanlagen mit elektronischem Sta- bilitatsprogramm (ESP) standardmäßig enthalten ist. Bei Bremsanlagen mit ESP-System sind daher keine zusätzlichen Sensoren erforderlich.To record the pressure gradient, the signals of a pressure sensor monitoring the master brake cylinder pressure can be used, which is included as standard in brake systems with an electronic stability program (ESP). No additional sensors are therefore required for brake systems with an ESP system.
Zur Anpassung der Ansteuerparameter für die Fremdbremseinrichtung konnten aber auch die Signale eines gesonderten oder im Fahrzeug ohnehin vorgesehenen Temperatursensors zur Erfassung der Umgebungstemperatur genutzt werden.To adapt the control parameters for the third-party brake device, however, the signals of a separate temperature sensor or one already provided in the vehicle could also be used to record the ambient temperature.
In einer besonders vorteilhaften Ausfuhrung kann die Messung des Druckgradienten wahrend einer z.B. nach dem Zun- dungsneustart durchgeführten Überprüfung der Bremsanlage erfolgen, bei der der Elektromagnet im Bremskraftverstarker mit einem rampenformig ansteigenden Strom oder einem ansteigenden Pulsweitenverhaltnis angesteuert und der zur Erreichung eines vorgegebenen Drucks (z.B. 5 bar) erforderliche Maximalstromwert Imaχ bzw. die maximale Pulsbreite PWMmax ermittelt wird. Eine derartige Überprüfung wird z.B. bei Fahrzeugen mit ESP-System und Booster-Vorladung nach jedem Zundungsneustart durchgeführt.In a particularly advantageous embodiment, the measurement of the pressure gradient can take place during a check of the brake system, for example, after restarting the ignition, in which the electromagnet in the brake booster is controlled with a ramp-like increasing current or an increasing pulse width ratio and that to achieve a predetermined pressure (e.g. 5 bar) the required maximum current value I m aχ or the maximum pulse width PWM max is determined. Such a check is carried out, for example, in vehicles with an ESP system and booster pre-charging after each restart of the ignition.
Die Genauigkeit der Temperaturerkennung laßt sich in vorteilhafter Weise dadurch verbessern, daß em Produkt aus dem erfaßten Druckgradient und dem Maximalstromwert Imax oder der maximalen Pulsbreite PWMmax gebildet wird. Anhand dieses Produktes kann besonders im interessanten, unteren Temperaturbereich mit einer relativ hohen Genauigkeit auf die Umgebungstemperatur geschlossen werden. Eine an die Umgebungstemperatur angepaßte Ansteuerung der Fremdbremseinrichtung kann so ohne gesonderte Sensorik unter Ausnutzung der ohnehin vorhandenen Sensoren erreicht werden. Die Temperaturanpassung kann z.B. dadurch erfolgen, daß bei niedrigen Temperaturen die Druckgradientenschwelle zur Auslosung der Fremdbremseinrichtung angehoben oder die Schwelle für die Geschwindigkeit der Bremspedalbetatigung zur Auslosung einer Bremsassistentenfunktion herabgesetzt wird.The accuracy of the temperature detection can be improved in an advantageous manner by forming a product of the detected pressure gradient and the maximum current value I max or the maximum pulse width PWM max . Based this product can be concluded with a relatively high accuracy of the ambient temperature, especially in the interesting, lower temperature range. A control of the external braking device that is adapted to the ambient temperature can thus be achieved without separate sensors, using the sensors that are present anyway. The temperature can be adjusted, for example, by raising the pressure gradient threshold for triggering the third-party brake device at low temperatures or lowering the threshold for the speed of the brake pedal actuation to trigger a brake assistant function.
Eine derartige Anpassung wird zweckmaßigerweise nach dem Zundungsneustart durchgeführt. Zur Berücksichtigung von Temperaturveranderungen wahrend des Fahrbetriebs konnte eine Überprüfung auch z.B. nach einem Stop wiederholt werden.Such an adjustment is expediently carried out after restarting the ignition. To take into account temperature changes during driving, a check could also be carried out e.g. be repeated after a stop.
Weitere Besonderheiten und Vorzuge der Erfindung ergeben sich aus der folgenden Beschreibung eines Ausfuhrungsbeispiels anhand der Zeichnung. Es zeigen:Further special features and advantages of the invention result from the following description of an exemplary embodiment with reference to the drawing. Show it:
Fig. 1 eine schematische Darstellung einer Kraftfahrzeug-Bremsanlage undFig. 1 is a schematic representation of a motor vehicle brake system and
Fig. 2 em Diagramm zur Erläuterung einer Temperaturerkennung durch einen Prufpuls bei einer Überprüfung des Bremssystems. Die in Fig. 1 schematisch dargestellte Kraftfahrzeug Bremsanlage besteht im wesentlichen aus einem durch den Fahrer betatigbaren und/oder elektrisch ansteuerbaren Bremsdruckgeber 1, einem zwischen dem Bremsdruckgeber 1 und den Radbremsen 2, 3, 4 und 5 geschalteten Hydroaggregat 6 zu einer bei Bedarf radselektiven Bremsdruckmodulation an den Radbremsen und einer Steuereinrichtung 7 zur elektrischen Ansteuerung des Hydroaggregats 6 und/oder des Bremsdruckgebers 1 Abhängigkeit der durch Sensoren erfaßten Betriebs- und Fahrzustandsgroßen.Fig. 2 em diagram for explaining a temperature detection by a test pulse when checking the brake system. The motor vehicle brake system shown schematically in Fig. 1 consists essentially of a brake pressure sensor 1 which can be actuated and / or electrically controlled by the driver, a hydraulic unit 6 connected between the brake pressure sensor 1 and the wheel brakes 2, 3, 4 and 5 for a wheel-selective brake pressure modulation if required on the wheel brakes and a control device 7 for the electrical control of the hydraulic unit 6 and / or the brake pressure sensor 1 as a function of the operating and driving state variables detected by sensors.
Der durch den Fahrer mittels eines Bremspedals 8 betatigba- re Bremsdruckgeber 1 besteht aus einem beispielsweise pneumatischen Bremskraftverstarker 9, dem em vorzugsweise als Tandemhauptzylinder ausgebildeter Hauptbremszylinder 10 nachgeschaltet ist. Die nicht im einzelnen dargestellten Druckraume des Hauptbremszylinders 10 sind mit einem Druck- mittelvorratsbehalter 11 verbindbar. Das Bremspedal 8 ist mit einer Betatigungsstange 12 zur Betätigung eines Steuerventils 13 gekoppelt, das den Aufbau eines pneumatischen Diffenzdrucks im Gehäuse des Unterdruck-Bremskraft- verstarkers steuert. Em durch Steuersignale der elektronischen Steuereinrichtung 7 ansteuerbarer Elektromagnet 14 ermöglicht eine von der Betätigung des Bremspedals 8 unabhängige Fremdbetatigung des Steuerventils 13.The brake pressure transmitter 1, which can be actuated by the driver by means of a brake pedal 8, consists of a pneumatic brake booster 9, for example, which is followed by a master brake cylinder 10, which is preferably designed as a tandem master cylinder. The pressure spaces of the master brake cylinder 10, which are not shown in detail, can be connected to a pressure medium reservoir 11. The brake pedal 8 is coupled to an actuating rod 12 for actuating a control valve 13, which controls the build-up of a pneumatic differential pressure in the housing of the vacuum brake booster. An electromagnet 14, which can be controlled by control signals from the electronic control device 7, enables the control valve 13 to be actuated independently of the actuation of the brake pedal 8.
Em mit dem Bremspedal 8 in Wirkverbindung stehender Brems- lichtschalter 15 ermöglicht die Erkennung einer Ansteuerung des Bremskraftverstarkers 9 durch den Fahrer oder durch eine Betätigung des Elektromagneten 14. Bei einer Fremdbeta- tigung des Bremskraftverstarkers 9 wird das Bremspedal 8 mitgefuhrt und so der Bremslichtschalter 15 umgesteuert. Eine durch den Fahrer eingeleitete Betätigung des Bremskraftverstarkers 9 kann durch den Einsatz eines Loseschalters 16 erkannt werden.A brake light switch 15 that is operatively connected to the brake pedal 8 enables the driver to recognize that the brake booster 9 has been activated or that the electromagnet 14 is actuated. adjustment of the brake booster 9, the brake pedal 8 is carried along and thus the brake light switch 15 is reversed. An actuation of the brake booster 9 initiated by the driver can be detected by using a release switch 16.
Die in der Fig. 1 dargestellte Bremsanlage weist zwei identisch aufgebaute Bremskreise I, II auf, so daß die folgende Beschreibung eines Bremskreises auch auf den anderen zutrifft.The brake system shown in Fig. 1 has two identically constructed brake circuits I, II, so that the following description of one brake circuit also applies to the other.
Das zwischen die beiden Druckausgange des Hauptbremszylm- ders 10 und die zu den Radbremsen 2, 3, 4, und 5 fuhrenden Hydraulikleitungen geschaltete Hydroaggregat 6 weist em Motor-Pumpen-Aggregat auf, das aus einer durch einen nicht gezeigten Elektromotor angetriebenen hydraulischen Ruckforderpumpe 17 besteht, deren Saugseite über em erstes Ruckschlagventil 18 sowie em elektromagnetisch betatigbares Schaltventil 19 an einen der beiden Druckraume des Haupt- bremszylinders 10 angeschlossen ist. Von der Druckseite der Ruckforderpumpe 17 strömt das Druckmittel über em zweites Rückschlagventil 20 und eine Dampfungskammer 21 zu einem hydraulischen Knotenpunkt 22. An diesen angeschlossen ist sowohl ein zum ersten Radbremszylinder 2 führender Leitungsabschnitt 23 als auch e zum zweiten Radbremszylinder 3 führender Leitungsabschnitt 24. Eine hydraulische Leitung 25 verbindet die Druckseite der Ruckforderpumpe 17 mit dem Tandemhauptzylinder 10. Außerdem ist zwischen dem Knotenpunkt 22 und dem Hauptbremszylinder 10 ein vorzugsweise elektromagnetisch betatigbares Trennventil 26 geschaltet, dem sowohl ein drittes Rückschlagventil 27 als auch em Druckbegrenzungsventil 28 parallelgeschaltet sind. Zur Modulation des im ersten Radbremszylinder 2 eingesteuerten Drucks dienen eine Parallelschaltung eines Einlaßventils 29 mit einem vierten Ruckschlagventil 30 sowie em Auslaßventil 31, wobei die erwähnte Parallelschaltung im Leitungsabschnitt 23 eingefugt ist und das Auslaßventil 31 zum Zwecke eines Radbremsdruckabbaus eine Verbindung zwischen dem ersten Radbremszylinder 2 und einem Niederdruckspeicher 32 ermöglicht, der über em fünftes Ruckschlagventil 33 mit der Saugseite der Ruckforderpumpe 17 verbunden ist.The hydraulic unit 6 connected between the two pressure outlets of the main brake cylinder 10 and the hydraulic lines 6 leading to the wheel brakes 2, 3, 4, and 5 has an engine-pump unit which consists of a hydraulic recovery pump 17 driven by an electric motor, not shown , whose suction side is connected to one of the two pressure spaces of the master brake cylinder 10 via a first check valve 18 and an electromagnetically actuated switching valve 19. From the pressure side of the recovery pump 17, the pressure medium flows via a second check valve 20 and a steaming chamber 21 to a hydraulic node 22. Connected to this are both a line section 23 leading to the first wheel brake cylinder 2 and a line section 24 leading to the second wheel brake cylinder 3 Line 25 connects the pressure side of the recovery pump 17 to the tandem master cylinder 10. In addition, a preferably electromagnetically actuated isolation valve 26 is connected between the node 22 and the master brake cylinder 10. which both a third check valve 27 and em pressure relief valve 28 are connected in parallel. A parallel connection of an inlet valve 29 with a fourth check valve 30 and an outlet valve 31 are used to modulate the pressure applied in the first wheel brake cylinder 2, the aforementioned parallel connection being inserted in the line section 23 and the outlet valve 31 for the purpose of reducing the wheel brake pressure, a connection between the first wheel brake cylinder 2 and a low-pressure accumulator 32 enables, which is connected via a fifth check valve 33 to the suction side of the recovery pump 17.
Um in dem zum betrachteten Bremskreis I gehörenden zweiten Radbremszylinder 3 analog zum Radbremszylinder 2 den darin eingesteuerten hydraulischen Druck regulieren zu können, sind eine zweite Parallelschaltung eines zweiten Einlaßventils 34 mit einem sechsten Ruckschlagventil 35 sowie em zweites Auslaßventil 36 vorgesehen, wobei die erwähnte Parallelschaltung im Leitungsabschnitt 24 eingefügt ist und das Auslaßventil 36 zum Zwecke eines Radbremsdruckabbaus eine Verbindung zwischen dem zweiten Radbremszylinder 38 und dem Niederdruckspeicher 32 herstellt.In order to be able to regulate the hydraulic pressure controlled therein in the second wheel brake cylinder 3 belonging to the brake circuit I under consideration, a second parallel connection of a second inlet valve 34 with a sixth check valve 35 and a second outlet valve 36 are provided, the parallel connection mentioned in the line section 24 is inserted and the outlet valve 36 for the purpose of reducing the wheel brake pressure establishes a connection between the second wheel brake cylinder 38 and the low-pressure accumulator 32.
Die Funktionsweise des Hydroaggregats 6 ist in der eingangs genannten EP 077 012 Bl ausführlich offenbart. Auf die dortige Beschreibung wird daher ausdrucklich Bezug genommen.The mode of operation of the hydraulic unit 6 is disclosed in detail in the aforementioned EP 077 012 B1. Express reference is therefore made to the description there.
Um die im Hauptbremszylinder 10 eingeleiteten Druckanderungen zu erfassen, sind in beiden Bremskreisen I, II Mittel zur Erfassung der Hauptbremszylinderdrucke vorgesehen, die vorzugsweise durch an den ersten und den zweiten Bremskreis I, II angeschlossene Drucksensoren 37 bzw. 38 gebildet sind, deren Ausgangssignale zusammen mit weiteren Signalen von Sensoren 39 bis 42, die z.B. Informationen über denIn order to detect the pressure changes introduced in the master brake cylinder 10, means for detecting the master brake cylinder pressures are provided in both brake circuits I, II, preferably by means of the first and second brake circuits I, II connected pressure sensors 37 and 38 are formed, the output signals together with further signals from sensors 39 to 42, which, for example, information about the
Lenkwinkel (δ) , die Raddrehzahlen (COR) , sowie die Fahrzeugreaktion, wie z.B. die Gierrate ( ψ ) oder die Querbeschleunigung (aq) darstellen, der elektronischen Steuereinrichtung 7 zugeführt werden.Steering angle (δ), the wheel speeds (COR), as well as the vehicle reaction, e.g. represent the yaw rate (ψ) or the lateral acceleration (aq), the electronic control device 7 are supplied.
Um eine ordnungsgemäße Funktion der Bremsanlage bei allen Temperaturbedingungen zu gewahrleisten, können die Ansteuerparameter für die Fremdbremseinrichtung, wie z.B. die Ausloseschwelle zur Aktivierung einer Bremsassistentenfunk- tion, an die vorliegenden Temperaturverhaltnisse angepaßt werden. Hierzu wird wahrend einer nach dem Zundungsneustart durchgeführten Bremsanlagenuberprufung, bei der eine Ansteuerung des Elektromagnets 14 durch einen in Fig. 1 gezeigten Prufpuls mit rampenformig ansteigendem Strom und eine Erfassung des zur Erreichung eines vorgegebenen Drucks erforderlichen Maximalstromwerts Imax erfolgt, auch derIn order to ensure proper functioning of the brake system under all temperature conditions, the control parameters for the third-party brake device, such as the triggering threshold for activating a brake assistant function, can be adapted to the existing temperature conditions. For this purpose, during a brake system check carried out after the ignition restart, in which the solenoid 14 is controlled by a test pulse shown in FIG. 1 with a ramp-like current and the maximum current value I max required to achieve a predetermined pressure is detected, the
Druckgradient erfaßt. Durch den Prufpuls laßt sich über das Produkt aus Druckgradient und Maximalstromwert Imax auf die Umgebungstemperatur schließen.Pressure gradient detected. The test pulse can be used to derive the ambient temperature from the product of the pressure gradient and maximum current value I max .
Fig. 2 zeigt em Diagramm, in dem der Zusammenhang zwischen der Umgebungstemperatur und dem Produkt aus Druckgradienten und Maximalstromwert dargestellt ist. Es ist ersichtlich, daß das erwähnte Produkt mit abnehmender Temperatur expo- nentiell ansteigt, so daß aus dem erwähnten Produkt beson ders im interessanten unteren Temperaturbereich mit relativ hoher Genauigkeit auf die Umgebungstemperatur geschlossen werden kann.2 shows a diagram in which the relationship between the ambient temperature and the product of the pressure gradient and the maximum current value is shown. It can be seen that the mentioned product increases exponentially with decreasing temperature, so that special results from the mentioned product in the interesting lower temperature range, the ambient temperature can be concluded with relatively high accuracy.
Auf der Grundlage des ermittelten Produkts kann dann z.B. die Druckgradientenschwelle für die Auslosung einer Fremdbremsung oder die Schwelle für die Betatigungsgeschwmdig- keit des Bremspedals zur Auslosung einer Bremsassistentenfunktion angepaßt werden. Based on the determined product, e.g. the pressure gradient threshold for triggering external braking or the threshold for the actuation speed of the brake pedal to trigger a brake assistant function are adapted.

Claims

Anspr cheClaims
Verfahren zum Betrieb einer blockiergeschutzten Bremsanlage zur Fahrstabilitäts- und/oder Antriebsschlupf¬ regelung, insbesondere für Kraftfahrzeuge, die einen durch den Fahrer und/oder durch eine Fremd- bremsemrichtung (14) betatigbaren BremsdruckgeberMethod for operating a brake system for driving stability blockiergeschutzten and / or traction slip control ¬, in particular for motor vehicles, comprising a bremsemrichtung by the driver and / or by a third-party (14) actuable brake pressure transducer
(1) , em zwischen dem Bremsdruckgeber (1) und die Radbremsen (2, 3, 4, 5) geschaltetes Hydroaggregat (6) zur radindividuellen Bremsdruckmodulation an den Radbremsen und eine Steuereinrichtung (7) zur Ansteuerung des Hydroaggregats (6) und/oder der Fremdbremseinrichtung (14) Abhängigkeit der durch Sensoren erfaßten Betriebs- und Fahrzustandsgroßen enthalt, dadurch gekennzeichnet, daß die Ansteuerparameter der Fremdbremseinrichtung (14) in Abhängigkeit von der Umgebungstemperatur angepaßt werden.(1), em between the brake pressure sensor (1) and the wheel brakes (2, 3, 4, 5) hydraulic unit (6) for wheel-specific brake pressure modulation on the wheel brakes and a control device (7) for controlling the hydraulic unit (6) and / or the third-party brake device (14) contains a dependency on the operating and driving state variables detected by sensors, characterized in that the control parameters of the third-party brake device (14) are adapted as a function of the ambient temperature.
Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Anpassung der Ansteuerparameter der Fremdbremsem richtung (14) anhand des ermittelten Druckgradienten bei einer vorgegebenen Ansteuerung der Fremdbremseinrichtung (14) erfolgt. !. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Erfassung des Druckgradienten bei einer Uberpr ufung der Bremsanlage erfolgt, bei der die Fremdbrem- semπchtung (14) mit einem ansteigenden Strom angesteuert und der zur Erreichung eines vorgegebenen Drucks erforderliche Maximalstromwert Imax ermittelt wird.Method according to Claim 1, characterized in that the control parameters of the external brake device (14) are adjusted on the basis of the pressure gradient determined when the external brake device (14) is controlled. !. Method according to Claim 2, characterized in that the pressure gradient is detected when the brake system is checked, in which the external brake device (14) is controlled with an increasing current and the maximum current value I max required to achieve a predetermined pressure is determined.
4. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Erfassung des Druckgradienten bei einer Überprüfung der Bremsanlage erfolgt, bei der die Fremdbrem- se πchtung (14) mit einem ansteigenden Pulsweiten- verhaltnis angesteuert und die zur Erreichung eines vorgegebenen Drucks erforderliche maximale Pulsbreite P Mmax ermittelt wird.4. The method according to claim 2, characterized in that the detection of the pressure gradient is carried out during a check of the brake system, in which the Fremdbrem- se πchtung (14) controlled with an increasing pulse width ratio and the maximum pulse width PM required to achieve a predetermined pressure max is determined.
5. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Anpassung der Ansteuerparameter auf der Grundlage des Produktes aus dem erfaßten Druckgradient und dem Maximalstromwert Imax erfolgt.5. The method according to claim 3, characterized in that the adjustment of the control parameters is carried out on the basis of the product of the detected pressure gradient and the maximum current value I max .
6. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Anpassung der Ansteuerparameter auf der Grundlage des Produktes aus dem erfaßten Druckgradient und der maximalen Pulsbreite PWMmax erfolgt.6. The method according to claim 4, characterized in that the adjustment of the control parameters is carried out on the basis of the product of the detected pressure gradient and the maximum pulse width PWM max .
7. Verfahren nach einem der Ansprüche 2 bis 6, dadurch gekennzeichnet, daß der Druckgradient über mindestens einen den Hauptbremszylinderdruck erfassenden Drucksensor (37, 38) ermittelt wird. 7. The method according to any one of claims 2 to 6, characterized in that the pressure gradient is determined via at least one pressure sensor (37, 38) detecting the master cylinder pressure.
. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Anpassung nach dem Zundungs neustart durchgeführt wird., Method according to one of claims 1 to 7, characterized in that the adaptation is carried out after the ignition restart.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß die Ansteuerparameter eine Druckgradientenschwelle und/oder eine Schwelle für die Be- tatigungsgeschwmdigkeit des Bremspedals umfassen.9. The method according to any one of claims 1 to 8, characterized in that the control parameters comprise a pressure gradient threshold and / or a threshold for the actuation speed of the brake pedal.
10. Blockiergeschutzte Bremsanlage zur Fahrstabilitats- und/oder Antriebsschlupfregelung, insbesondere für Kraftfahrzeuge, die einen durch den Fahrer und/oder durch eine Fremd- bremsemrichtung (14) betatigbaren Bremsdruckgeber10. An anti-lock brake system for driving stability and / or traction control, in particular for motor vehicles, which has a brake pressure transmitter which can be actuated by the driver and / or by an external brake device (14)
(1), e zwischen dem Bremsdruckgeber (1) und die Radbremsen (2, 3, 4, 5) geschaltetes Hydroaggregat (6) zur radindividuellen Bremsdruckmodulation an den Radbremsen und eine Steuereinrichtung (7) zur Ansteuerung des Hydroaggregats (6) und/oder der Fremdbremseinrichtung ( 1 ) , e between the brake pressure transmitter (1) and the wheel brakes (2, 3, 4, 5) connected hydraulic unit (6) for wheel-specific brake pressure modulation on the wheel brakes and a control device (7) for controlling the hydraulic unit (6) and / or the external braking device
(14) m Abhängigkeit der durch Sensoren erfaßten Betriebs- und Fahrzustandsgroßen enthalt, dadurch gekennzeichnet, daß die Steuereinrichtung (7) eine Einrichtung zur Anpassung der Ansteuerparameter der Fremdbremseinrichtung(14) m as a function of the operating and driving state variables detected by sensors, characterized in that the control device (7) has a device for adapting the control parameters of the external brake device
(14) in Abhängigkeit von der Umgebungstemperatur aufweist . (14) depending on the ambient temperature.
1. Bremsanlage nach Anspruch 10 dadurch gekennzeichnet, daß die Fremdbremseinrichtung ein elektrisch betätig bares Magnetventil (14) zur Steuerung der Verstärkung des Bremskraftverstärkers (9) umfaßt. 1. Brake system according to claim 10, characterized in that the third-party braking device comprises an electrically actuatable solenoid valve (14) for controlling the amplification of the brake booster (9).
PCT/EP2000/008192 1999-08-24 2000-08-22 Brake system and method for operating the same WO2001014189A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19939875 1999-08-24
DE19939875.5 1999-08-24
DE10004183.3 2000-02-01
DE10004183A DE10004183A1 (en) 1999-08-24 2000-02-01 Brake system and method for its operation

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5607209A (en) * 1994-06-06 1997-03-04 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Braking apparatus and braking method for vehicle
DE19604126A1 (en) * 1996-02-06 1997-08-07 Bosch Gmbh Robert Method and device for controlling the brake system of a vehicle
EP0867350A2 (en) * 1997-03-27 1998-09-30 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Brake control system for vehicles
DE19744112C1 (en) * 1997-10-06 1998-10-22 Lucas Ind Plc Vehicle braking system
DE19725241A1 (en) * 1997-06-14 1998-12-17 Itt Mfg Enterprises Inc Method for controlling a motor vehicle brake system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5607209A (en) * 1994-06-06 1997-03-04 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Braking apparatus and braking method for vehicle
DE19604126A1 (en) * 1996-02-06 1997-08-07 Bosch Gmbh Robert Method and device for controlling the brake system of a vehicle
EP0867350A2 (en) * 1997-03-27 1998-09-30 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Brake control system for vehicles
DE19725241A1 (en) * 1997-06-14 1998-12-17 Itt Mfg Enterprises Inc Method for controlling a motor vehicle brake system
DE19744112C1 (en) * 1997-10-06 1998-10-22 Lucas Ind Plc Vehicle braking system

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