WO2002014131A1 - Method for controlling an electronically controllable braking system, and a circuit - Google Patents

Method for controlling an electronically controllable braking system, and a circuit Download PDF

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Publication number
WO2002014131A1
WO2002014131A1 PCT/EP2001/009289 EP0109289W WO0214131A1 WO 2002014131 A1 WO2002014131 A1 WO 2002014131A1 EP 0109289 W EP0109289 W EP 0109289W WO 0214131 A1 WO0214131 A1 WO 0214131A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
control unit
electronic control
switched
brake booster
Prior art date
Application number
PCT/EP2001/009289
Other languages
German (de)
French (fr)
Inventor
Bernhard Giers
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 DE10135508A external-priority patent/DE10135508A1/en
Application filed by Continental Teves Ag & Co. Ohg filed Critical Continental Teves Ag & Co. Ohg
Publication of WO2002014131A1 publication Critical patent/WO2002014131A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/48—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
    • 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
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/404—Control of the pump unit
    • B60T8/4045—Control of the pump unit involving ON/OFF switching
    • 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
    • B60T8/44—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
    • B60T8/441—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems using hydraulic boosters
    • B60T8/442—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 co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems using hydraulic boosters the booster being a fluid return pump, e.g. in combination with a brake pedal force booster

Definitions

  • the invention relates to a method for controlling an electronically controllable brake system for a vehicle with a drive which can be switched on and off and which has a brake force increasing unit which can be controlled externally by an electronic control unit.
  • the invention also relates to a circuit arrangement of an electronically controllable brake system with an electronic control unit and a brake booster.
  • the vehicle brake systems used today rely on brake power support, which in the case of passenger vehicles is usually done by a vacuum brake booster.
  • the braking power support of the booster is based on a vacuum suction power of the drive motor and is therefore only guaranteed when the drive motor is running.
  • the invention has for its object to develop a method or a circuit arrangement of the type mentioned in such a way that even when the drive motor is not running or when the ignition of the
  • This object is achieved in that in a method for controlling an electronically controllable brake system for a vehicle with a drive that can be switched on and off and that has a brake force increasing unit that can be controlled externally by an electronic control unit, in the case in which the drive or the electrical one
  • the energy supply system of the drive is switched off, an energy supply system is active is switched or remains active, which the electronic control unit and
  • Brake force increasing unit supplied with energy.
  • the term “externally controllable braking force increasing unit” here means a unit by means of which the braking force or the braking pressure can in principle be increased independently of the driver or “actively”.
  • a suitable braking force is made available by a suitable activation of the pressure increasing unit even when the drive of the vehicle, in particular an internal combustion engine, is not running or even when the ignition switch for the internal combustion engine is inactive stands. This measure increases the active safety of vehicles, since adequate braking force support can be ensured in any case.
  • the energy supply of the electronic control unit and brake force increasing unit by the energy supply system takes place independently of a parking brake or parking brake function. This means that only the function of the service vehicle brake, but not the function of a parking brake or parking brake, is to be ensured by the measure according to the invention.
  • the braking force is increased by a pump, such as a hydraulic pump or a vacuum pump, but preferably a hydraulic pump, and the pump can be driven by an electric motor which can be controlled by the electronic control unit.
  • the braking force increasing unit is switched to active or remains switched on when the drive is switched off.
  • a brake booster interacting with the drive of the vehicle in particular vacuum booster, is provided that a missing or inadequate amplification function of the brake booster can be recognized by an error detection device and in the event that a missing one or insufficient amplification function is detected, the energy supply system for the electronic control unit and the brake force increasing unit is switched to active or remains switched on.
  • a missing or inadequate amplification function is recognized by a sensor or a switch in the interior of a vacuum amplifier.
  • the object on which the invention is based is also achieved by a circuit arrangement of an electronically controllable brake system with an electronic control unit and a brake booster, which in particular for
  • the method according to the invention is used and is characterized in that a sensor or a switch is assigned to the viewing arrangement to detect a missing or inadequate amplification function of the brake booster, which sensor or switch is connected to a control transistor which is used in the absence or insufficient boosting function of the brake booster controls a switching transistor, which thus changes to a closed switching position and actively switches the electronic control unit.
  • Brake booster preferably a vacuum brake booster, used and the
  • Control transistor goes when there is no or insufficient amplification function of the
  • Brake booster in a closed switching position, for controlling the switching transistor, which thereby changes into a closed switching position and actively switches the electronic control unit.
  • the electronically controllable brake system has a vacuum brake booster and that the switch for detecting a missing or insufficient boost function is arranged essentially within the vacuum brake booster.
  • a missing or insufficient vacuum can also be sensed via analog sensors, in particular pressure sensors, and the signal can be fed to the control unit.
  • the method according to the invention and / or the circuit arrangement according to the invention is preferably used for an electronically controllable brake system with a vehicle dynamics control (ESP), a traction control system (ASR) and / or an optimized hydraulic brake system (OHB).
  • ESP vehicle dynamics control
  • ASR traction control system
  • OLB optimized hydraulic brake system
  • 0HB N here means a brake system in which, in addition to a vacuum brake booster, the brake is boosted by a hydraulic pressure booster, typically a motor-pump unit.
  • a hydraulic pressure booster typically a motor-pump unit.
  • OHB systems in particular are contemplated in which a lack of vacuum suction power of an internal combustion engine as a vehicle drive or a certain design of the vacuum amplifier is compensated by a preferably hydraulic amplifier.
  • the electric motor-operated pump is advantageously used as the braking force increasing unit.
  • a necessary braking force increase and thus a necessary deceleration performance of the vehicle can advantageously be ensured even in the event of a vacuum failure and / or a low vacuum suction power and / or a low design point of the vacuum brake booster.
  • the figure shows an embodiment of the circuit arrangement according to the invention, which is arranged within an electronic control unit (ECU) of a vehicle brake system.
  • ECU electronice control unit
  • the circuit arrangement shown in the figure has a switch 1, which is preferably inside a
  • Vacuum brake booster (Boosters) is arranged and connected to the ECU via two connections 10,11. If the auxiliary energy is missing or too low, in particular due to a lack of vacuum in the booster, switch 1 is opened. As a result, a connection of the vehicle electrical system 3 to the ECU is connected to a control transistor 5, in this case to the base of the transistor 5, via a first resistor 2. As a result, a base current flows through the base and emitter to ground 4.
  • the control transistor 5 acts like an open switch, as a result of which a switching transistor 6 is connected to a second transistor via its collector Resistor 7 current is supplied.
  • the current supply takes place at the base of the switching transistor 6, which is connected via a third resistor 8 to the emitter of the switching transistor 6, whereby the switching transistor 6 opens and a load current via its emitter from the vehicle electrical system connection 3 via its collector and via a first diode 9 activation of the e 'lekronischen control unit (ECU) is supplied. If the ignition is switched on, the current is supplied to the ECU via connection 12 via a second diode 13. By means of this circuit and by the method, the ECU is activated even when the drive motor is switched off and thus a lack of vacuum support. This allows the ECU to control a pressure increase unit, such as a motor-pump unit, which provides brake force assistance
  • the double function of the switch 1 is particularly advantageous here, which on the one hand senses the lack of vacuum and on the other hand also directly activates the ECU.
  • the figure shows a simple basic circuit diagram for such an activation circuit. On the basis of the invention, it is also possible to modify and / or supplement this circuit within the scope of the skilled person.
  • the ECU is continuously energized. Then, however, their current consumption should be relatively low and preferably less than approximately 100 ⁇ A.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Regulating Braking Force (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The invention relates to a circuit and a method for controlling an electronically controllable braking system for a vehicle comprising a drive which can be activated or disactivated. Said vehicle also has a unit which increases braking force and which can be externally controlled by an electronic control unit. Said method is characterised in that if the drive or the electric energy supply system pertaining to the drive is disactivated, an energy supply system is, or remains, activated, supplying energy to the electronic control unit and the unit which increases braking force.

Description

Verfahren zur Steuerung einer elektronisch regelbaren Bremsanlage und SchaltungsanordnungMethod for controlling an electronically controllable brake system and circuit arrangement
Die Erfindung betrifft ein Verfahren zur Steuerung einer elektronisch regelbaren Bremsanlage für ein Fahrzeug mit einem ein- und abschaltbaren Antrieb, das eine durch eine elektronische Regeleinheit fremdansteuerbare Bremskrafterhöhungseinheit aufweist. Die Erfindung betrifft ebenso eine Schaltungsanordnung einer elektronisch regelbaren Bremsanlage mit einer elektronischen Regeleinheit und einem Bremskraftverstärker.The invention relates to a method for controlling an electronically controllable brake system for a vehicle with a drive which can be switched on and off and which has a brake force increasing unit which can be controlled externally by an electronic control unit. The invention also relates to a circuit arrangement of an electronically controllable brake system with an electronic control unit and a brake booster.
Die heute eingesetzten Fahrzeugbremsanlagen sind auf eine Bremskraftunterstützung angewiesen, die im Fall von Personenkraftfahrzeugen meist durch einen Vakuumbremskraftverstärker (Booster) erfolgt. Die Bremskraftunterstützung des Boosters beruht hier auf einer Vakuumsaugleistung des Antriebsmotors und ist daher nur gewährleistet, wenn der Antriebsmotor läuft.The vehicle brake systems used today rely on brake power support, which in the case of passenger vehicles is usually done by a vacuum brake booster. The braking power support of the booster is based on a vacuum suction power of the drive motor and is therefore only guaranteed when the drive motor is running.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren bzw. eine Schaltungsanordnung der eingangs genannten Art derart weiterzubilden, dass auch bei einem nicht laufendem Antriebsmotor bzw. bei ausgeschalteter Zündung desThe invention has for its object to develop a method or a circuit arrangement of the type mentioned in such a way that even when the drive motor is not running or when the ignition of the
Fahrzeugs eine ausreichende Bremsleistung zur Verfügung gestellt werden kann.Sufficient braking power can be made available to the vehicle.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass bei einem Verfahren zur Steuerung einer elektronisch regelbaren Bremsanlage für ein Fahrzeug mit einem ein- und abschaltbaren Antrieb, das eine durch eine elektronische Regeleinheit fremdansteuerbare Bremskrafterhöhungseinheit aufweist, in dem Fall, in dem der Antrieb bzw. das elektrische Energieversorgungssystem des Antriebs abgeschaltet ist, ein Energieversorgungssystem aktiv geschaltet wird oder aktiv geschaltet bleibt, welches die elektronische Regeleinheit und dieThis object is achieved in that in a method for controlling an electronically controllable brake system for a vehicle with a drive that can be switched on and off and that has a brake force increasing unit that can be controlled externally by an electronic control unit, in the case in which the drive or the electrical one The energy supply system of the drive is switched off, an energy supply system is active is switched or remains active, which the electronic control unit and
Bremskrafterhöhungseinheit energetisch versorgt. Der Begriff „fremdansteuerbare Bremskrafterhöhungseinheit' bedeutet hier eine Einheit, mittels der im Grundsatz fahrerunabhängig oder „aktiv* die Bremskraft bzw. der Bremsdrucks erhöht werden kann.Brake force increasing unit supplied with energy. The term “externally controllable braking force increasing unit” here means a unit by means of which the braking force or the braking pressure can in principle be increased independently of the driver or “actively”.
Wesentlich für die Erfindung ist es demnach, dass durch eine geeignete Aktivierung der Druckerhöhungseinheit eine notwendige Bremskraft auch dann zur Verfügung gestellt wird, wenn der Antrieb des Fahrzeugs, insbesondere ein Verbrennungsmotor, nicht läuft bzw. auch dann, wenn der ZündungsSchalter für den Verbrennungsmotor auf inaktiv steht. Durch diese Maßnahme wird die aktive Sicherheit von Fahrzeugen erhöht, da in jedem Fall eine ausreichende Bremskraftunterstützung sichergestellt werden kann.It is therefore essential for the invention that a suitable braking force is made available by a suitable activation of the pressure increasing unit even when the drive of the vehicle, in particular an internal combustion engine, is not running or even when the ignition switch for the internal combustion engine is inactive stands. This measure increases the active safety of vehicles, since adequate braking force support can be ensured in any case.
Es ist vorgesehen, dass die energetische Versorgung der elektronischen Regeleinheit und Bremskrafterhöhungseinheit durch das Energieversorgungssystem unabhängig von einer Parkbremsen- oder Feststellbremsenfunktion erfolgt. Damit ist gemeint, dass durch die erfindungsgemäße Maßnahme nur die Funktion der Betriebs-Fahrzeugbremse, aber nicht die Funktion einer Parkbremse- oder Feststellbremse sichergestellt werden soll.It is envisaged that the energy supply of the electronic control unit and brake force increasing unit by the energy supply system takes place independently of a parking brake or parking brake function. This means that only the function of the service vehicle brake, but not the function of a parking brake or parking brake, is to be ensured by the measure according to the invention.
In einer besonders günstigen Ausführungsform der Erfindung erfolgt die Bremskrafterhöhung durch eine Pumpe, wie eine hydraulische Pumpe oder eine Vakuumpumpe, vorzugsweise aber eine hydraulische Pumpe, und die Pumpe ist durch einen Elekromotor antreibbar, der durch die elektronische Regeleinheit ansteuerbar ist. Nach der Erfindung wird die Bremskrafterhöhungseinheit aktiv geschaltet oder bleibt aktiv geschaltet, wenn der Antrieb abgeschaltet wird.In a particularly favorable embodiment of the invention, the braking force is increased by a pump, such as a hydraulic pump or a vacuum pump, but preferably a hydraulic pump, and the pump can be driven by an electric motor which can be controlled by the electronic control unit. According to the invention, the braking force increasing unit is switched to active or remains switched on when the drive is switched off.
Nach einer weiteren Ausführungsform der Erfindung ist es vorgesehen, dass ein mit dem Antrieb des Fahrzeugs zusammenwirkender Bremskraftverstärker, insbesondere Vakuumverstärker, vorgesehen ist, dass durch eine Fehlererkennungseinrichtung eine fehlende bzw. nicht ausreichende Verstärkungsfunktion des Bremskraftverstärkers erkennbar ist und in dem Fall, in dem eine fehlende bzw. nicht ausreichende Verstärkungsfunktion erkannt wird, das Energieversorgungssystem für die elektronische Regeleinheit und die Bremskrafterhöhungseinheit aktiv geschaltet wird oder aktiv geschaltet bleibt.According to a further embodiment of the invention, it is provided that a brake booster interacting with the drive of the vehicle, in particular vacuum booster, is provided that a missing or inadequate amplification function of the brake booster can be recognized by an error detection device and in the event that a missing one or insufficient amplification function is detected, the energy supply system for the electronic control unit and the brake force increasing unit is switched to active or remains switched on.
Erfindungsgemäß ist es vorgesehen, dass eine fehlende bzw. nicht ausreichende Verstärkungsfunktion erkannt wird durch einen Sensor oder einen Schalter im Innern eines Vakuumverstärkers .According to the invention, a missing or inadequate amplification function is recognized by a sensor or a switch in the interior of a vacuum amplifier.
Die der Erfindung zugrunde liegende Aufgabe wird auch durch eine Schaltungsanordnung einer elektronisch regelbaren Bremsanlage mit einer elektronischen Regeleinheit und einem Bremskraftverstärker gelöst, die insbesondere zurThe object on which the invention is based is also achieved by a circuit arrangement of an electronically controllable brake system with an electronic control unit and a brake booster, which in particular for
Durchführung des erfindungsgemäßen Verfahrens dient und die dadurch gekennzeichnet ist, dass der Sehaltungsanordnung ein Sensor oder ein Schalter zugeordnet ist, zur Erkennung einer fehlenden bzw. nicht ausreichenden Verstärkungsfunktion des Bremskraftverstärkers, welcher Sensor oder Schalter in Verbindung steht mit einem Steuertransistor, der bei fehlender bzw. nicht ausreichender Verstärkungsfunktion des Bremskraftverstärkers einen Schalttransistor ansteuert, der so in eine geschlossene Schaltstellung übergeht und die elektronische Regeleinheit aktiv schaltet. Erfindungsgemäß wird ein Schalter zur Erkennung einer fehlenden bzw. nicht ausreichenden Verstärkungsfunktion desThe method according to the invention is used and is characterized in that a sensor or a switch is assigned to the viewing arrangement to detect a missing or inadequate amplification function of the brake booster, which sensor or switch is connected to a control transistor which is used in the absence or insufficient boosting function of the brake booster controls a switching transistor, which thus changes to a closed switching position and actively switches the electronic control unit. According to the invention, a switch for detecting a missing or insufficient amplification function of the
Bremskraftverstärkers, vorzugsweise eines Vakuumbremskraftverstärkers (Boosters), verwendet und derBrake booster, preferably a vacuum brake booster, used and the
Steuertransistor geht bei fehlender bzw. nicht ausreichender Verstärkungsfunktion desControl transistor goes when there is no or insufficient amplification function of the
Bremskraftverstärkers in eine geschlossene Schaltstellung über, zur Ansteuerung des Schalttransistors, der dadurch in eine geschlossene Schaltstellung übergeht und die elektronische Regeleinheit aktiv schaltet.Brake booster in a closed switching position, for controlling the switching transistor, which thereby changes into a closed switching position and actively switches the electronic control unit.
Es ist vorgesehen, dass die elektronisch regelbare Bremsanlage einen Vakuumbremskraftverstärker aufweist und dass der Schalter zur Erkennung einer fehlenden bzw. nicht ausreichenden Verstärkungsfunktion im wesentlichen innerhalb des Vakuumbremskraftverstärkers angeordnet ist. Alternativ kann auch über analoge Sensoren, insbesondere Drucksensoren, ein fehlendes oder zu geringes Vakuum sensiert werden und das Signal der Regeleinheit zugeführt werden.It is provided that the electronically controllable brake system has a vacuum brake booster and that the switch for detecting a missing or insufficient boost function is arranged essentially within the vacuum brake booster. Alternatively, a missing or insufficient vacuum can also be sensed via analog sensors, in particular pressure sensors, and the signal can be fed to the control unit.
Vorzugsweise wird das Verfahren nach der Erfindung und/oder die Schaltunganordnung nach der Erfindung verwendet für eine elektronisch regelbare Bremsanlage mit einer Fahrzeugdynamikregelung (ESP) , einem Antriebsschlupfregelungssystem (ASR) und/oder einem optimierten hydraulischen Bremssystem (OHB) .The method according to the invention and / or the circuit arrangement according to the invention is preferably used for an electronically controllable brake system with a vehicle dynamics control (ESP), a traction control system (ASR) and / or an optimized hydraulic brake system (OHB).
Mit dem Begriff „0HBN ist hier ein Bremssystem gemeint, bei dem zusätzlich zu einem Vakuumbremskraftverstärker eine Bremskraftverstärkung durch eine hydraulische Druckerhöhungseinheit, typisch ein Motor-Pumpen-Aggregat, erfolgt. Insbesondere ist in diesem Zusammenhang an OHB- Systeme gedacht, bei denen eine fehlende Vakuumsaugleistung eines Verbrennungsmotors als Fahrzeugantrieb oder eine bestimmte Auslegung des Vakuumverstärkers durch einen vorzugsweise hydraulischen Verstärker kompensiert wird.The term “0HB N ” here means a brake system in which, in addition to a vacuum brake booster, the brake is boosted by a hydraulic pressure booster, typically a motor-pump unit. In this context, OHB systems in particular are contemplated in which a lack of vacuum suction power of an internal combustion engine as a vehicle drive or a certain design of the vacuum amplifier is compensated by a preferably hydraulic amplifier.
Bei den ESP/ASR-Systemen wird als Bremskrafterhöhungseinheit vorteilhaft die darin vorgesehene elekromotorisch betriebene Pumpe eingesetzt. Durch eine gezielte Ansteuerung dieser Pumpe bzw. des Elekromotors kann eine notwendige Bremskrafterhöhung und damit eine notwendige Verzögerungsleistung des Fahrzeugs vorteilhaft auch bei einem Vakuumausfall und/oder einer geringen Vakuumsaugleistung und/oder einem niedrigen Auslegungspunkt des Vakuumbremskraftverstärkers sichergestellt werden.In the ESP / ASR systems, the electric motor-operated pump is advantageously used as the braking force increasing unit. Through a targeted control of this pump or the electric motor, a necessary braking force increase and thus a necessary deceleration performance of the vehicle can advantageously be ensured even in the event of a vacuum failure and / or a low vacuum suction power and / or a low design point of the vacuum brake booster.
Die Erfindung wird in der nachfolgenden Beschreibung unter Bezugnahme auf die beiliegende Zeichnung (Fig.) näher erläutert.The invention is explained in more detail in the following description with reference to the accompanying drawing (FIG.).
Die Fig. zeigt eine Ausführungsform der erfindungsgemäßen Schaltungsanordnung, die innerhalb einer elekronischen Regeleinheit (ECU) eines Fahrzeugbremssystems angeordnet ist.The figure shows an embodiment of the circuit arrangement according to the invention, which is arranged within an electronic control unit (ECU) of a vehicle brake system.
Die in der Fig. dargestellte Schaltungsanordnung weist einen Schalter 1 auf, der vorzugsweise im Innern einesThe circuit arrangement shown in the figure has a switch 1, which is preferably inside a
Vakuumbremskraftverstärkers (Boosters) angeordnet ist und über zwei Anschlüsse 10,11 mit der ECU verbunden ist. Bei fehlender oder zu geringer Hilfsenergie, insbesondere durch fehlendes Vakuum im Booster, wird der Schalter 1 geöffnet. Dadurch wird über einen ersten Widerstand 2 ein Anschluß des Fahrzeugbordnetzes 3 an der ECU mit einem Steuertransistor 5, in diesem Fall mit der Basis des Transistors 5, verbunden. Dadurch fließt ein Basisstrom über Basis und Emitter an Masse 4. Der Steuertransistor 5 wirkt wie ein geöffneter Schalter, wodurch über dessen Kollektor einem Schalttransistor 6 über einem zweiten Widerstand 7 Strom zugeführt wird. Die Stromzuführung erfolgt an der Basis des Schalttransistors 6, die über einen dritten Widerstand 8 mit dem Emitter des Schalttransistors 6 verbunden ist, wodurch der Schalttransistor 6 öffnet und ein Laststrom über dessen Emitter von dem Bordnetzanschluß 3 über dessen Kollektor und über eine erste Diode 9 zur Aktivierung der e'lekronischen Regeleinheit (ECU) zugeführt wird. Ist die Zündung angeschaltet, wird der Strom über den Anschluß 12 der ECU über eine zweite Diode 13 zugeführt. Durch diese Schaltung und durch das Verfahren wird also auch bei abgeschaltetem Antriebsmotor und damit einem Fehlen der Vakuumunterstützung, die ECU aktivtiert. Damit kann die ECU eine Druckerhöhungseinheit, wie ein Motor-Pumpen-Aggregat, ansteuern, wodurch eine Bremskraftunterstützung durchVacuum brake booster (Boosters) is arranged and connected to the ECU via two connections 10,11. If the auxiliary energy is missing or too low, in particular due to a lack of vacuum in the booster, switch 1 is opened. As a result, a connection of the vehicle electrical system 3 to the ECU is connected to a control transistor 5, in this case to the base of the transistor 5, via a first resistor 2. As a result, a base current flows through the base and emitter to ground 4. The control transistor 5 acts like an open switch, as a result of which a switching transistor 6 is connected to a second transistor via its collector Resistor 7 current is supplied. The current supply takes place at the base of the switching transistor 6, which is connected via a third resistor 8 to the emitter of the switching transistor 6, whereby the switching transistor 6 opens and a load current via its emitter from the vehicle electrical system connection 3 via its collector and via a first diode 9 activation of the e 'lekronischen control unit (ECU) is supplied. If the ignition is switched on, the current is supplied to the ECU via connection 12 via a second diode 13. By means of this circuit and by the method, the ECU is activated even when the drive motor is switched off and thus a lack of vacuum support. This allows the ECU to control a pressure increase unit, such as a motor-pump unit, which provides brake force assistance
Hilfsenergie, insbesondere duch eine Motor-Pumpen-Einheit, erst ermöglicht wird.Auxiliary energy, in particular through a motor-pump unit, is only made possible.
Besonders vorteilhaft ist hier die Doppelfunktion des Schalters 1, der einerseits eine Sensierung des fehlenden Vakuums und andererseits auch direkt eine Aktivierung der ECU bewirkt. Die Fig. zeigt ein einfaches Prinzipschaltbild für eine derartige AktivierungsSchaltung. Auf der Grundlage der Erfindung ist es auch möglich diese Schaltung im Rahmen des fachmännischen Könnens abzuwandeln und/oder zu ergänzen.The double function of the switch 1 is particularly advantageous here, which on the one hand senses the lack of vacuum and on the other hand also directly activates the ECU. The figure shows a simple basic circuit diagram for such an activation circuit. On the basis of the invention, it is also possible to modify and / or supplement this circuit within the scope of the skilled person.
Wird ein fehlendes oder zu geringes Vakuum mittels analoger Sensoren, insbesondere Drucksensoren, sensiert, dann dient ein Schalteingang mit entsprechend angepaßterIf a missing or insufficient vacuum is sensed by means of analog sensors, in particular pressure sensors, then a switching input with a correspondingly adapted one is used
Eingangsempfindlichkeit zur Aktivierung der ECU.Input sensitivity to activate the ECU.
Alternativ ist es vorgesehen, die ECU dauernd zu bestromen. Dann sollte jedoch deren Stromaufnahme relativ gering sein und vorzugsweise kleiner ca. 100 μA betragen. Alternatively, it is provided that the ECU is continuously energized. Then, however, their current consumption should be relatively low and preferably less than approximately 100 μA.

Claims

Patentansprücheclaims
1. Verfahren zur Steuerung einer elektronisch regelbaren Bremsanlage für ein Fahrzeug mit einem ein- und abschaltbaren Antrieb, das eine durch eine elektronische Regeleinheit fremdansteuerbare Bremskrafterhöhungseinheit aufweist, dadurch gekennzeichnet, dass in dem Fall, in dem der Antrieb bzw. das elektrische Energieversorgungssystem des Antriebs abgeschaltet ist, ein1. A method for controlling an electronically controllable brake system for a vehicle with a drive which can be switched on and off and which has a brake force increasing unit which can be controlled externally by an electronic control unit, characterized in that in the case in which the drive or the electrical energy supply system of the drive is switched off is a
Energieversorgungssystem aktiv geschaltet wird oder aktiv geschaltet bleibt, welches die elektronische Regeleinheit und die Bremskrafterhöhungseinheit energetisch versorgt.Energy supply system is switched to active or remains switched on, which supplies the electronic control unit and the brake force increasing unit with energy.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die energetische Versorgung der elektronischen Regeleinheit und Bremskrafterhöhungseinheit durch das2. The method according to claim 1, characterized in that the energetic supply of the electronic control unit and braking force increasing unit by the
Energieversorgungssystem unabhängig von einer Parkbremsen- oder Feststellbremsenfunktion erfolgt.Power supply system is independent of a parking brake or parking brake function.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Bremskrafterhöhung durch eine Pumpe erfolgt und dass die Pumpe durch einen Elekromotor antreibbar ist, der durch die elektronische Regeleinheit ansteuerbar ist.3. The method according to claim 1 or 2, characterized in that the braking force is increased by a pump and that the pump can be driven by an electric motor which can be controlled by the electronic control unit.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die4. The method according to any one of claims 1 to 3, characterized in that the
Bremskrafterhöhungseinheit aktiv geschaltet wird oder aktiv geschaltet bleibt, wenn der Antrieb abgeschaltet wird. Brake force increasing unit is switched to active or remains switched on when the drive is switched off.
. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass ein mit dem Antrieb des Fahrzeugs zusammenwirkender Bremskraftverstärker vorgesehen ist, dass durch eine Fehlererkennungseinrichtung eine fehlende bzw. nicht ausreichende Verstärkungsfunktion des Bremskraftverstärkers erkennbar ist und in dem Fall, in dem eine fehlende bzw. nicht ausreichende Verstärkungsfunktion erkannt wird, das Energieversorgungssystem für die elektronische, Method according to one of claims 1 to 4, characterized in that a brake booster cooperating with the drive of the vehicle is provided, that a missing or inadequate amplification function of the brake booster can be recognized by an error detection device and in the case in which a missing or insufficient power function is detected, the power supply system for the electronic
Regeleinheit und die Bremskrafterhöhungseinheit aktiv geschaltet wird oder aktiv geschaltet bleibt.Control unit and the braking force increasing unit is activated or remains activated.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass eine fehlende bzw. nicht ausreichende Verstärkungsfunktion erkannt wird durch einen Sensor oder einen Schalter im Innern eines Vakuumverstärkers .6. The method according to claim 5, characterized in that a missing or insufficient amplification function is detected by a sensor or a switch inside a vacuum amplifier.
7. Schaltungsanordnung einer elektronisch regelbaren7. Circuit arrangement of an electronically controllable
Bremsanlage mit einer elektronischen Regeleinheit und einem Bremskraftverstärker, insbesondere zur Durchführung eines Verfahrens nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Schaltungsanordnung ein Sensor oder ein Schalter zugeordnet ist, zur Erkennung einer fehlenden bzw. nicht ausreichenden Verstärkungsfunktion des Bremskraftverstärkers, welcher Sensor oder Schalter in Verbindung steht mit einem Steuertransistor, der bei fehlender bzw. nicht ausreichender Verstärkungsfunktion des Bremskraftverstärkers einen Schalttransistor ansteuert, der so in eine geschlossene Schaltstellung übergeht und die elektronische Regeleinheit aktiv schaltet. Brake system with an electronic control unit and a brake booster, in particular for carrying out a method according to one of claims 1 to 6, characterized in that the circuit arrangement is assigned a sensor or a switch for detecting a missing or inadequate amplification function of the brake booster, which sensor or switch is connected to a control transistor which, in the absence or insufficient amplification function of the brake booster, controls a switching transistor, which thus changes to a closed switching position and actively switches the electronic control unit.
8. Schaltungsanordnung nach Anspruch 7, dadurch gekennzeichnet, dass ein Schalter zur Erkennung einer fehlenden bzw. nicht ausreichenden Verstärkungsfunktion des Bremskraftverstärkers verwendet wird und dass der Steuertransistor bei fehlender bzw. nicht ausreichender Verstärkungsfunktion des Bremskraftverstärkers in eine geschlossene Schaltstellung übergeht, zu Ansteuerung des Schalttransistors, der dadurch in eine geschlossene Schaltstellung übergeht und die elektronische Regeleinheit aktiv schaltet.8. The circuit arrangement as claimed in claim 7, characterized in that a switch is used to detect a missing or inadequate amplification function of the brake booster and that the control transistor changes to a closed switching position when there is no or inadequate amplification function of the brake booster, for actuation of the switching transistor, which thereby changes to a closed switching position and actively switches the electronic control unit.
9. Schaltungsanordnung nach Anspruch 8, dadurch gekennzeichnet, dass die elektronisch regelbare Bremsanlage einen9. Circuit arrangement according to claim 8, characterized in that the electronically controllable braking system
Vakuumbremskraftverstärker aufweist und dass der Schalter zur Erkennung einer fehlenden bzw. nicht ausreichenden Verstärkungsfunktion im wesentlichen innerhalb des Vakuumbremskraftverstärkers angeordnet ist.Has vacuum brake booster and that the switch for detecting a missing or insufficient amplification function is arranged essentially within the vacuum brake booster.
10. Verwendung eines Verfahrens nach einem der Ansprüche 1 bis 6 und/oder einer Schaltunganordnung nach einem der Ansprüche 7 bis 9 für eine elektronisch regelbare Bremsanlage mit einer Fahrzeugdynamikregelung (ESP) , einem Antriebsschlupfregelungssystem (ASR) und/oder einem optimierten hydraulischen Bremssystem (OHB) . 10. Use of a method according to one of claims 1 to 6 and / or a circuit arrangement according to one of claims 7 to 9 for an electronically controllable brake system with a vehicle dynamics control (ESP), a traction control system (ASR) and / or an optimized hydraulic brake system (OHB ).
PCT/EP2001/009289 2000-08-11 2001-08-10 Method for controlling an electronically controllable braking system, and a circuit WO2002014131A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10039222 2000-08-11
DE10039222.9 2000-08-11
DE10135508.4 2001-07-20
DE10135508A DE10135508A1 (en) 2000-08-11 2001-07-20 Method for controlling an electronically controllable brake system and circuit arrangement

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156855A (en) * 1983-02-24 1984-09-06 Toyota Motor Corp Negative pressure supply unit for brake booster
US4699435A (en) * 1984-12-06 1987-10-13 Alfred Teves Gmbh Circuit arrangement for monitoring and controlling the pressure in the auxiliary pressure supply system of a hydraulic motor vehicle brake arrangement
US4738112A (en) * 1985-09-10 1988-04-19 Toyota Jidosha Kabushiki Kaisha Method and device for controlling brake booster supplementary vacuum pump ensuring good booster vacuum and low pump wear
JPS63314385A (en) * 1987-06-17 1988-12-22 Nippon Denso Co Ltd Pump drive controller for vehicle
US4845463A (en) * 1987-04-08 1989-07-04 Navistar International Transportation Corp. Brake system with auxiliary pump warning circuit
DE3913113A1 (en) * 1989-04-21 1990-10-25 Vdo Schindling Supply connection for anti-skid circuit - has part of circuit connected to battery via logic circuit to protect against battery drain
WO1992000211A1 (en) * 1990-06-29 1992-01-09 Allied-Signal Inc. Electrically powered brake system and method
JPH06144203A (en) * 1992-11-13 1994-05-24 Jidosha Kiki Co Ltd Pump driving circuit in hydraulic brake booster device
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59156855A (en) * 1983-02-24 1984-09-06 Toyota Motor Corp Negative pressure supply unit for brake booster
US4699435A (en) * 1984-12-06 1987-10-13 Alfred Teves Gmbh Circuit arrangement for monitoring and controlling the pressure in the auxiliary pressure supply system of a hydraulic motor vehicle brake arrangement
US4738112A (en) * 1985-09-10 1988-04-19 Toyota Jidosha Kabushiki Kaisha Method and device for controlling brake booster supplementary vacuum pump ensuring good booster vacuum and low pump wear
US4845463A (en) * 1987-04-08 1989-07-04 Navistar International Transportation Corp. Brake system with auxiliary pump warning circuit
JPS63314385A (en) * 1987-06-17 1988-12-22 Nippon Denso Co Ltd Pump drive controller for vehicle
DE3913113A1 (en) * 1989-04-21 1990-10-25 Vdo Schindling Supply connection for anti-skid circuit - has part of circuit connected to battery via logic circuit to protect against battery drain
WO1992000211A1 (en) * 1990-06-29 1992-01-09 Allied-Signal Inc. Electrically powered brake system and method
JPH06144203A (en) * 1992-11-13 1994-05-24 Jidosha Kiki Co Ltd Pump driving circuit in hydraulic brake booster device
DE19743959A1 (en) * 1997-10-04 1999-04-08 Bayerische Motoren Werke Ag Brake system for motor vehicles

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