EP1439992A1 - Eletrohydraulic braking system for motor vehicles - Google Patents

Eletrohydraulic braking system for motor vehicles

Info

Publication number
EP1439992A1
EP1439992A1 EP02801314A EP02801314A EP1439992A1 EP 1439992 A1 EP1439992 A1 EP 1439992A1 EP 02801314 A EP02801314 A EP 02801314A EP 02801314 A EP02801314 A EP 02801314A EP 1439992 A1 EP1439992 A1 EP 1439992A1
Authority
EP
European Patent Office
Prior art keywords
pressure
valve
valves
brake
electro
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02801314A
Other languages
German (de)
French (fr)
Inventor
Hans-Jörg Feigel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and 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 DE10232872A external-priority patent/DE10232872B4/en
Application filed by Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of EP1439992A1 publication Critical patent/EP1439992A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking
    • B60T8/4081—Systems with stroke simulating devices for driver input
    • 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
    • B60T7/02—Brake-action initiating means for personal initiation
    • B60T7/04—Brake-action initiating means for personal initiation foot actuated
    • B60T7/042—Brake-action initiating means for personal initiation foot actuated by electrical means, e.g. using travel or force sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4072—Systems in which a driver input signal is used as a control signal for the additional fluid circuit which is normally used for braking

Definitions

  • the invention relates to an electrohydraulic brake system for motor vehicles, which can be controlled in a “brake-by-wire” operating mode both by the vehicle driver and independently of the vehicle driver, with a master brake cylinder that can be actuated by means of a brake pedal and has at least one pressure chamber, a pressureless pressure medium reservoir, and one an electronic control and regulating unit which can be controlled hydraulic pressure source, the pressure of which can be applied to the vehicle's wheel brakes, which are connected to the master brake cylinder by means of at least one connection which can be shut off by a separating valve and which pressure control valves (intake valve, exhaust valve) are assigned which are controlled by the electronic control and control unit can be controlled analog and the wheel brakes either with the pressure source or
  • the device for adjusting the flexibility of the brake pedal has a first pedal travel valve and a second pedal travel valve, one of the pedal travel valves between the master brake cylinder and the suction side of one of the Pressure source associated pump or a low pressure accumulator and the other of the pedal travel valves between the master brake cylinder and the pressure side of the pump or a high pressure accumulator assigned to the pressure source is arranged.
  • the electronic control unit is set up to control the two pedal travel valves as a function of an actuation of the brake pedal, the pedal travel valves being designed as proportional travel or pressure valves.
  • the electrically controllable valve arrangement is formed by the isolating valve, a pressure regulating or control valve connected to the output side of the isolating valve, the output connection of which is connected to the pressure medium reservoir, and further valves which act on the pressure chamber of the master brake cylinder enable the pressure set in at least one wheel brake and / or the pressure applied by the pressure source.
  • the isolating valve is designed as an analog, controllable, normally open (SO) 2/2-way valve, while the Pressure control valve is designed as an analog controllable, normally closed (SG) 2/2-way valve.
  • the control valve connected to the outlet side of the isolating valve can be designed as a normally closed (SG) switching valve.
  • valves which allow the pressure in the pressure chamber (4) of the master brake cylinder to be acted upon by the pressure which is controlled in at least one wheel brake are formed by the outlet valves connected to the outlet side of the first separating valve and assigned to the individual wheel brakes ,
  • valves that allow the pressure chamber of the master brake cylinder to be acted upon by the pressure applied by the pressure source are formed by the inlet valves assigned to the individual wheel brakes and the outlet valves.
  • an analog controllable pressure control valve is connected between the pressure source and the pressure chamber of the master brake cylinder.
  • inlet valves assigned to the wheel brakes are designed as normally closed (SG) 2/2-way valves.
  • the outlet valves assigned to the wheel brakes are designed as normally open (SO) 2/2-way valves.
  • the master brake cylinder is designed as a tandem master cylinder
  • the outlet connections of the outlet valves, which are assigned to the second brake circuit, and the outlet connection of the second one Isolating valve can be connected to the pressure medium reservoir via an electrically controllable switching valve.
  • a pressure control valve with an overpressure function is connected between the output connection of the pressure source and the first isolating valve, which, when the first isolating valve is open, enables the pressure chamber of the master brake cylinder to be acted upon in a controlled manner with the pressure applied by the pressure source.
  • a further advantageous embodiment of the subject matter of the invention provides that an analogly controllable pressure control valve is connected in the connection between the pressure source and the inlet side of the inlet valves.
  • hydraulic-mechanical means are provided between the master brake cylinder and the isolating valve, which allow a preselected flexibility of the brake pedal in the “brake-by-wire” operating mode.
  • Fig. 2 shows the structure of a second embodiment of the brake system according to the invention in the inactive or de-energized state
  • Fig. 3 shows the structure of a third embodiment of the brake system according to the invention in a representation corresponding to FIGS. 1 and 2.
  • the brake system of the “brake-by-wire ⁇ ” type which is shown only schematically in the drawing, has an actuation unit 2 which can be actuated by means of an actuation pedal provided with the reference numeral 1 and which essentially consists of a dual-circuit pressure transmitter or master brake cylinder 3 and an unpressurized pressure medium reservoir 6.
  • the master brake cylinder 3 in turn has two separate pressure spaces 4, 5, which are connected to the pressure medium reservoir 6.
  • a wheel brake 7 assigned to the right front wheel of the motor vehicle and a wheel brake 8 assigned to the left rear wheel of the motor vehicle are connected to the first pressure chamber (primary pressure chamber) 4, to which a pressure sensor 13 is connected, by means of a lockable first hydraulic line 11.
  • the line 11 is shut off by means of a first isolating valve 9, which is preferably designed as an electromagnetically actuated, normally open (SO), analog controllable 2/2-way valve.
  • the output side of the first isolating valve 9 is connected by means of a hydraulic connecting line 16 to the pressure medium reservoir 6, in which an electromagnetically actuated, normally closed (SG-), analog controllable 2/2-way valve 17 is inserted.
  • the first isolating valve 9 and the 2/2-way valve 17, which can be regulated in an analog manner, form an electrically controllable device which, in the “brake-by-wire” operating mode, enables a preselected flexibility of the brake pedal 1 and thus gives the driver the familiar brake pedal feeling.
  • the second pressure chamber 5 of the master brake cylinder 2 can be connected to the other pair of wheel brakes 14, 15 via a second hydraulic line 12 which can be shut off by means of a second separating valve 10 and which is assigned to the right rear wheel of the motor vehicle and one to the left front wheel of the motor vehicle.
  • the second isolating valve 10 is designed as an electromagnetically actuated, normally open (SO) switching valve, the output side of which can be connected to the pressure medium reservoir 6 with the interposition of an electromagnetically actuated, normally open (SO) switching valve 18. Otherwise, the construction of the hydraulic circuit connected to the second pressure chamber 5 of the master brake cylinder 2 corresponds identically to that of the brake circuit 11 explained in the above description, so that it does not need to be discussed in the following text.
  • a motor-pump unit 20 serving as an external pressure source is provided with a high-pressure accumulator 21, which in turn consists of a pump 23 driven by an electric motor 22.
  • the suction side of the pump 23 is connected via a check valve 34 to the input side of the pressure control valve 17 mentioned above or the output side of the first isolating valve 9.
  • the outlet of the high-pressure accumulator 21 is connected via a pressure relief valve 24 to a line section 31 which connects the first isolating valve 9 to the 2/2-way valve 17 which can be regulated in an analog manner.
  • the filling state of the high-pressure accumulator 21 is monitored by means of a displacement sensor 25, which is only indicated schematically.
  • a third hydraulic line 26 connects the pressure side of the pump 23 or the output of the high-pressure accumulator 21 to the input side of two electromagnetically actuated, analog controllable, preferably normally closed (SG) 2/2-way or inlet valves 27, 28 are connected upstream of the wheel brakes 7 and 8 and serve to build up a hydraulic pressure in these wheel brakes.
  • the reduction of the hydraulic pressure applied in the wheel brakes 7, 9 is served by two electromagnetically actuated, analog controllable, preferably normally open (SO) 2/2-way or exhaust valves 29, 30, the output connections of which are connected to the previously mentioned line section 31
  • the wheel brake 7 is assigned a pressure sensor 32, with the aid of which the hydraulic pressure prevailing in the wheel brake 7 is determined.
  • An electronic control and regulating unit ECU 34 which in particular serves to control the motor-pump assembly 20, the valves 9, 10, 17, 18, 27, 28, 29, 30 and the pressure control valves assigned to the second brake circuit 12 the output signals of the pressure sensors 13, 32, the displacement sensor 25 and a preferably redundant brake request detection device 33, which is assigned to the master brake cylinder 3, are supplied.
  • an analog controllable 2/2-way valve 35 with overpressure function is connected between the outlet of the high-pressure accumulator 21 and the line section 31 mentioned in connection with FIG.
  • an analog controllable 2/2-way valve 35 with overpressure function is connected between the outlet of the high-pressure accumulator 21 and the line section 31 mentioned in connection with FIG.
  • similarly controllable, normally closed (SG) 2/2-way valve 36 is provided which, when a pressure equal to zero is set in line 26, enables a targeted application of a defined pressure medium volume to the wheel brakes 7, 8, -.
  • the pressure values determined by the pressure sensors 32 can then be evaluated to detect gases in the system.
  • both the isolation valves 9, 10 assigned to the pressure chambers 4, 5 of the master brake cylinder 2 are designed as analog-controllable, normally open (SO) 2/2-way valves.
  • the outputs of the isolating valves 9, 10 are connected on the one hand to the outlet side of the outlet valves 29, 30, -, - and on the other hand to the pressure medium reservoir 6 via switching valves 37, - which are closed when de-energized.
  • the output of the high-pressure accumulator 21 is connected to the first pressure chamber 4 of the master brake cylinder 2 via an analog controllable, normally closed (SG) 2/2-way valve 38.
  • Brake request detection device 33 control signals which are supplied to the previously mentioned electronic control unit 34 which generates control signals which are used to switch over the separating, pressure regulating as well as described in the preceding text Shutter valves are used. These control signals activate the first isolating valve 9 in a controlled manner, the second isolating valve 10 is closed, and the pressure control valve 17 is opened.
  • a pressure maintenance phase is initiated by switching the inlet valves 27, 28, -, - into their closed position.
  • the inlet valves 27, 28, -, - are closed and the corresponding outlet valves 29, 30, -, - are opened in a controlled manner.
  • the valves 17, 18 connected to the lines leading to the pressure medium reservoir 6 are also opened.
  • the pressure medium volume consumed in the wheel brakes 7, 8 is first used to reset the master cylinder pistons.
  • This volume of pressure medium flows through the now open outlet valves 29, 30 and the opened isolating valve 9 into the first pressure chamber 4 of the master brake cylinder 2. Since in some cases this volume is not sufficient to reset the master cylinder piston completely, the inlet valves 27, 28 are also opened , so that 21 pressure medium volume from the high pressure accumulator Can be "pushed". The use of the volume from the wheel brakes is energetically advantageous.
  • the release process proceeds similarly in the embodiment according to FIG. 3.
  • the switching valves 37, - mentioned above are closed, the pressure medium volume provided by the high-pressure accumulator 21 flowing in with closed inlet valves 27, 28 being regulated via the pressure control valve 38.
  • the outlet valves 29, 30, - are opened.
  • the brake system according to the invention automatically switches to a fallback operating mode in which driver braking is possible.
  • Both the isolation valves 9, 10 and the exhaust valves 29, 30, -, - are switched to the inactive switch position shown in the drawing, so that a hydraulic connection between the master cylinder 3 and the wheel brakes is released, via which pressure can be built up ,

Landscapes

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

Abstract

The invention concerns an electrohydraulic braking system of the Brake-by-Wire type and aims at providing the driver with the usual feel of the brake pedal or in guaranteeing a preselected flexibility of the brake pedal with an electrically-actuated valve device. Therefor, the electrically-actuated valve comprises a block valve (9), a pressure adjusting or control valve (17, 37) which is connected on the block valve (9) output side and whereof the output connection is connected to the pressure medium tank (6), as well as other valves (27, 28, 29, 30) which enable to subject the pressure chamber (4) of the brake master cylinder (2) to the pressure input into at least one brake on the wheel (7, 8) and/or the pressure applied by the pressure source (21).

Description

Elektrohydraulische Bremsanlage für KraftfahrzeugeElectro-hydraulic brake system for motor vehicles
Die Erfindung betrifft eine elektrohydraulische Bremsanlage für Kraftfahrzeuge, die in einer Betriebsart „Brake-by-Wire" sowohl vom Fahrzeugführer als auch unabhängig vom Fahrzeugführer ansteuerbar ist, mit einem mittels eines Bremspedals betätigbaren, mindestens einen Druckraum aufweisenden Hauptbremszylinder, einem drucklosen Druckmittelvorratsbehälter, einer mittels einer elektronischen Steuer- und Regeleinheit ansteuerbaren hydraulischen Druckquelle, mit deren Druck Radbremsen des Fahrzeuges beaufschlagbar sind, die mittels mindestens einer durch ein Trennventil absperrbaren Verbindung an den Hauptbremszylinder angeschlossen sind und denen Druckregelventile (Einlassventil, Auslassventil) zugeordnet sind, die durch die elektronische Steuer- und Regeleinheit analog ansteuerbar sind und die die Radbremsen wahlweise mit der Druckquelle oder demThe invention relates to an electrohydraulic brake system for motor vehicles, which can be controlled in a “brake-by-wire” operating mode both by the vehicle driver and independently of the vehicle driver, with a master brake cylinder that can be actuated by means of a brake pedal and has at least one pressure chamber, a pressureless pressure medium reservoir, and one an electronic control and regulating unit which can be controlled hydraulic pressure source, the pressure of which can be applied to the vehicle's wheel brakes, which are connected to the master brake cylinder by means of at least one connection which can be shut off by a separating valve and which pressure control valves (intake valve, exhaust valve) are assigned which are controlled by the electronic control and control unit can be controlled analog and the wheel brakes either with the pressure source or
Druckmittelvorratsbehälter verbinden, sowie mit einer durch die elektronische Steuer- und Regeleinheit elektrisch steuerbaren Einrichtung, die in der Betriebsart „Brake-by-Wirew eine vorgewählte Nachgiebigkeit des Bremspedals durch Öffnen einer Ventileinrichtung ermöglicht.Connect the pressure medium reservoir as well as a device that can be electrically controlled by the electronic control and regulating unit, which, in the “Brake-by-Wire w ” operating mode, enables a preselected flexibility of the brake pedal by opening a valve device.
Eine derartige Bremsanlage ist z. B. aus der internationalen Patentanmeldung WO 98/31576 bekannt. Bei der vorbekannten Bremsanlage weist die Einrichtung zum Einstellen der Nachgiebigkeit des Bremspedals ein erstes Pedalwegventil sowie ein zweites Pedalwegventil auf, wobei eines der Pedalwegventile zwischen dem Hauptbremszylinder und der Saugseite einer der Druckquelle zugeordneten Pumpe bzw. einem Niederdruckspeicher und das andere der Pedalwegventile zwischen dem Hauptbremszylinder und der Druckseite der Pumpe bzw. einem der Druckquelle zugeordneten Hochdruckspeicher angeordnet ist. Die elektronische Steuer- und Regeleinheit ist dabei zum Steuern der zwei Pedalwegventile in Abhängigkeit von einer Betätigung des Bremspedals eingerichtet, wobei die Pedalwegventile als Proportionalweg- oder -druckventile ausgebildet sind.Such a brake system is such. B. from the international patent application WO 98/31576 known. In the known brake system, the device for adjusting the flexibility of the brake pedal has a first pedal travel valve and a second pedal travel valve, one of the pedal travel valves between the master brake cylinder and the suction side of one of the Pressure source associated pump or a low pressure accumulator and the other of the pedal travel valves between the master brake cylinder and the pressure side of the pump or a high pressure accumulator assigned to the pressure source is arranged. The electronic control unit is set up to control the two pedal travel valves as a function of an actuation of the brake pedal, the pedal travel valves being designed as proportional travel or pressure valves.
Als weniger vorteilhaft wird bei der vorbekannten Bremsanlage die verhältnismäßig hohe Anzahl der Regelventile angesehen, deren Verwendung mit beträchtlichem Kosten- und Energieaufwand verbunden ist.The relatively high number of control valves is regarded as less advantageous in the known brake system, the use of which is associated with considerable expenditure of costs and energy.
Es ist daher Aufgabe der vorliegenden Erfindung, eine zuverlässig funktionierende Bremsanlage der eingangs genannten Gattung mit einer reduzierten Anzahl der erforderlichen Regelventile zur Verfügung zu stellen bzw. eine Bremsanlage vorzuschlagen, die bei gleichem Komfort mit einem niedrigeren Kosten- sowie Energieaufwand realisierbar ist.It is therefore an object of the present invention to provide a reliably functioning brake system of the type mentioned at the outset with a reduced number of the required control valves or to propose a brake system which can be implemented with the same comfort with a lower cost and energy expenditure.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die elektrisch steuerbare Ventilanordnung durch das Trennventil, ein an die Ausgangsseite des Trennventils angeschlossenes Druckregel- oder Steuerventil, dessen Ausgangsanschluss an den Druckmittelvorratsbehälter angeschlossen ist, sowie weitere Ventile gebildet ist, die ein Beaufschlagen des Druckraums des HauptbremsZylinders mit dem mindestens in einer Radbremse eingesteuerten Druck und/oder dem von der Druckquelle aufgebrachten Druck ermöglichen.This object is achieved according to the invention in that the electrically controllable valve arrangement is formed by the isolating valve, a pressure regulating or control valve connected to the output side of the isolating valve, the output connection of which is connected to the pressure medium reservoir, and further valves which act on the pressure chamber of the master brake cylinder enable the pressure set in at least one wheel brake and / or the pressure applied by the pressure source.
Zur Konkretisierung des Erfindungsgedankens ist vorgesehen, dass die das Trennventil als ein analog regelbares, stromlos offenes (SO-) 2/2- egeventil ausgebildet ist, während das Druckregelventil als ein analog regelbares, stromlos geschlossenes (SG-) 2/2-Wegeventil ausgebildet ist. Alternativ kann das an die Ausgangsseite des Trennventils angeschlossene Steuerventil als ein stromlos geschlossenes (SG-) Schaltventil ausgebildet sein.To concretize the idea of the invention, it is provided that the isolating valve is designed as an analog, controllable, normally open (SO) 2/2-way valve, while the Pressure control valve is designed as an analog controllable, normally closed (SG) 2/2-way valve. Alternatively, the control valve connected to the outlet side of the isolating valve can be designed as a normally closed (SG) switching valve.
Eine andere vorteilhafte Ausgestaltung des Erfindungsgegenstandes sieht vor, dass die Ventile, die ein Beaufschlagen des Druckraums (4) des HauptbremsZylinders mit dem mindestens in einer Radbremse eingesteuerten Druck ermöglichen, durch die an die Ausgangsseite des ersten Trennventils angeschlossenen, den einzelnen Radbremsen zugeordneten Auslassventile gebildet sind.Another advantageous embodiment of the subject matter of the invention provides that the valves which allow the pressure in the pressure chamber (4) of the master brake cylinder to be acted upon by the pressure which is controlled in at least one wheel brake are formed by the outlet valves connected to the outlet side of the first separating valve and assigned to the individual wheel brakes ,
Dabei ist es besonders vorteilhaft, wenn die Ventile, die ein Beaufschlagen des Druckraums des HauptbremsZylinders mit dem von der Druckquelle aufgebrachten Druck ermöglichen, durch die den einzelnen Radbremsen zugeordneten Einlassventile sowie die Auslassventile gebildet sind.It is particularly advantageous if the valves that allow the pressure chamber of the master brake cylinder to be acted upon by the pressure applied by the pressure source are formed by the inlet valves assigned to the individual wheel brakes and the outlet valves.
Bei einer weiteren vorteilhaften Variante des Erfindungsgegenstandes ist zwischen der Druckquelle und dem Druckraum des Hauptbremszylinders ein analog regelbares Druckregelventil geschaltet.In a further advantageous variant of the subject matter of the invention, an analog controllable pressure control valve is connected between the pressure source and the pressure chamber of the master brake cylinder.
Eine vorteilhafte Weiterbildung des Erfindungsgegenstandes sieht vor, dass die den Radbremsen zugeordneten Einlassventile als stromlos geschlossene (SG-) 2/2-Wegeventile ausgebildet sind.An advantageous development of the subject matter of the invention provides that the inlet valves assigned to the wheel brakes are designed as normally closed (SG) 2/2-way valves.
Eine andere vorteilhafte Weiterbildung des Erfindungsgegenstandes sieht vor, dass die den Radbremsen zugeordneten Auslassventile als stromlos offene (SO-) 2/2- Wegeventile ausgebildet sind. Bei einer weiteren Ausgestaltung der Erfindung, bei der der Hauptbremszylinder als ein Tandemhauptzylinder ausgebildet ist, an dessen zweiten Druckraum unter Zwischenschaltung eines zweiten Trennventils ein zweiter Bremskreis angeschlossen ist, sind die Ausgangsanschlüsse der Auslassventile, die dem zweiten Bremskreis zugeordnet sind, sowie der Ausgangsanschluss des zweiten Trennventils über ein elektrisch ansteuerbares Schaltventil mit dem Druckmittelvorratsbehälter verbindbar. Außerdem ist es besonders sinnvoll, wenn zwischen dem Ausgangsanschluss der Druckquelle und dem ersten Trennventil ein Druckregelventil mit Überdruckfunktion angeschlossen ist, das beim offenen ersten Trennventil ein geregeltes Beaufschlagen des Druckraums des Hauptbremszylinders mit dem von der Druckquelle aufgebrachten Druck ermöglicht.Another advantageous further development of the subject matter of the invention provides that the outlet valves assigned to the wheel brakes are designed as normally open (SO) 2/2-way valves. In a further embodiment of the invention, in which the master brake cylinder is designed as a tandem master cylinder, to the second pressure chamber of which a second brake circuit is connected with the interposition of a second isolating valve, the outlet connections of the outlet valves, which are assigned to the second brake circuit, and the outlet connection of the second one Isolating valve can be connected to the pressure medium reservoir via an electrically controllable switching valve. In addition, it is particularly useful if a pressure control valve with an overpressure function is connected between the output connection of the pressure source and the first isolating valve, which, when the first isolating valve is open, enables the pressure chamber of the master brake cylinder to be acted upon in a controlled manner with the pressure applied by the pressure source.
Eine weitere vorteilhafte Ausgestaltung des Erfindungsgegenstandes sieht vor, dass in der Verbindung zwischen der Druckquelle und der Eingangsseite der Einlassventile ein analog regelbares Druckregelventil geschaltet ist.A further advantageous embodiment of the subject matter of the invention provides that an analogly controllable pressure control valve is connected in the connection between the pressure source and the inlet side of the inlet valves.
Um bei der erfindungsgemäßen Bremsanlage eine günstige Energiebilanz, insbesondere im unteren Druckbereich, zu erreichen, sind zwischen dem Hauptbremszylinder und dem Trennventil hydraulisch-mechanische Mittel vorgesehen, die in der Betriebsart „Brake-by-Wire" eine vorgewählte Nachgiebigkeit des Bremspedals ermöglichen.In order to achieve a favorable energy balance, in particular in the lower pressure range, in the brake system according to the invention, hydraulic-mechanical means are provided between the master brake cylinder and the isolating valve, which allow a preselected flexibility of the brake pedal in the “brake-by-wire” operating mode.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung gehen aus der nachfolgenden Beschreibung von drei Ausführungsbeispielen unter Bezugnahme auf die beiliegende schematische Zeichnung hervor, wobei für gleiche Komponenten die gleichen Bezugszeichen verwendet werden. In den Zeichnungen zeigen: Fig. 1 den Aufbau der erfindungsgemäßen Bremsanlage gemäß einer ersten Ausführungsform im inaktiven bzw. stromlosen Zustand,Further details, features and advantages of the invention will become apparent from the following description of three exemplary embodiments with reference to the accompanying schematic drawing, the same reference numerals being used for the same components. The drawings show: 1 shows the structure of the brake system according to the invention according to a first embodiment in the inactive or de-energized state,
Fig. 2 den Aufbau einer zweiten Ausführungsform der erfindungsgemäßen Bremsanlage im inaktiven bzw. stromlosen Zustand, undFig. 2 shows the structure of a second embodiment of the brake system according to the invention in the inactive or de-energized state, and
Fig. 3 den Aufbau einer dritten Ausführungsform der erfindungsgemäßen Bremsanlage in einer der Fig. 1 bzw. 2 entsprechenden Darstellung.Fig. 3 shows the structure of a third embodiment of the brake system according to the invention in a representation corresponding to FIGS. 1 and 2.
Die in der Zeichnung lediglich schematisch dargestellte Bremsanlage des Typs „Brake-by-wireλλ weist eine mittels eines mit dem Bezugszeichen 1 versehenen Betätigungspedals betätigbare Betätigungseinheit 2 auf, die im wesentlichen aus einem zweikreisigen Druckgeber bzw. Hauptbremszylinder 3 sowie einem drucklosen Druckmittelvorratsbehälter 6 besteht. Der Hauptbremszylinder 3 weist seinerseits zwei voneinander getrennte Druckräume 4, 5 auf, die mit dem Druckmittelvorratsbehälter 6 in Verbindung stehen. An den ersten Druckraum (Primärdruckraum) 4, an den ein Drucksensor 13 angeschlossen ist, sind mittels einer absperrbaren ersten hydraulischen Leitung 11 eine dem rechten Vorderrad des Kraftfahrzeugs zugeordnete Radbremse 7 sowie eine dem linken Hinterrad des Kraftfahrzeugs zugeordnete Radbremse 8 angeschlossen. Das Absperren der Leitung 11 erfolgt mittels eines ersten Trennventils 9, das vorzugsweise als ein elektromagnetisch betätigbares, stromlos offenes (SO-) , analog regelbares 2/2- Wegeventil ausgebildet ist. Die Ausgangsseite des ersten Trennventils 9 ist mittels einer hydraulischen Verbindungsleitung 16 mit dem Druckmittelvorratsbehälter 6 verbunden, in der ein elektromagnetisch betätigbares, stromlos geschlossenes (SG-) , analog regelbares 2/2-Wegeventil 17 eingefügt ist. Das erste Trennventil 9 sowie das analog regelbare 2/2-Wegeventil 17 bilden eine elektrisch steuerbare Einrichtung, die in der Betriebsart „Brake-by-Wire" eine vorgewählte Nachgiebigkeit des Bremspedals 1 ermöglicht und somit dem Fahrer das gewohnte Bremspedalgefühl vermittelt .The brake system of the “brake-by-wire λλ ” type, which is shown only schematically in the drawing, has an actuation unit 2 which can be actuated by means of an actuation pedal provided with the reference numeral 1 and which essentially consists of a dual-circuit pressure transmitter or master brake cylinder 3 and an unpressurized pressure medium reservoir 6. The master brake cylinder 3 in turn has two separate pressure spaces 4, 5, which are connected to the pressure medium reservoir 6. A wheel brake 7 assigned to the right front wheel of the motor vehicle and a wheel brake 8 assigned to the left rear wheel of the motor vehicle are connected to the first pressure chamber (primary pressure chamber) 4, to which a pressure sensor 13 is connected, by means of a lockable first hydraulic line 11. The line 11 is shut off by means of a first isolating valve 9, which is preferably designed as an electromagnetically actuated, normally open (SO), analog controllable 2/2-way valve. The output side of the first isolating valve 9 is connected by means of a hydraulic connecting line 16 to the pressure medium reservoir 6, in which an electromagnetically actuated, normally closed (SG-), analog controllable 2/2-way valve 17 is inserted. The first isolating valve 9 and the 2/2-way valve 17, which can be regulated in an analog manner, form an electrically controllable device which, in the “brake-by-wire” operating mode, enables a preselected flexibility of the brake pedal 1 and thus gives the driver the familiar brake pedal feeling.
Der zweite Druckraum 5 des HauptbremsZylinders 2 ist über eine mittels eines zweiten Trennventils 10 absperrbare zweite hydraulische Leitung 12 mit dem anderen Radbremsenpaar 14, 15 verbindbar, das dem rechten Hinterrad des Kraftfahrzeugs zugeordnete sowie eine dem linken Vorderrad des Kraftfahrzeugs zugeordnet ist. Das zweite Trennventil 10 ist als ein elektromagnetisch betätigbares, stromlos offenes (SO-) Schaltventil ausgebildet, dessen Ausgangsseite unter Zwischenschaltung eines ebenso elektromagnetisch betätigbaren, stromlos offenen (SO-) Schaltventils 18 mit dem Druckmittelvorratsbehälter 6 verbindbar ist. Ansonsten entspricht der Aufbau des an den zweiten Druckraum 5 des HauptbremsZylinders 2 angeschlossenen hydraulischen Kreises identisch dem des in der vorstehenden Beschreibung erläuterten Bremskreises 11, so dass er im nachfolgenden Text nicht mehr erörtert zu werden braucht.The second pressure chamber 5 of the master brake cylinder 2 can be connected to the other pair of wheel brakes 14, 15 via a second hydraulic line 12 which can be shut off by means of a second separating valve 10 and which is assigned to the right rear wheel of the motor vehicle and one to the left front wheel of the motor vehicle. The second isolating valve 10 is designed as an electromagnetically actuated, normally open (SO) switching valve, the output side of which can be connected to the pressure medium reservoir 6 with the interposition of an electromagnetically actuated, normally open (SO) switching valve 18. Otherwise, the construction of the hydraulic circuit connected to the second pressure chamber 5 of the master brake cylinder 2 corresponds identically to that of the brake circuit 11 explained in the above description, so that it does not need to be discussed in the following text.
Wie der Zeichnung weiter zu entnehmen ist, ist ein als Fremddruckquelle dienendes Motor-Pumpen-Aggregat 20 mit einem Hochdruckspeicher 21 vorgesehen, das seinerseits aus einer mittels eines Elektromotors 22 angetriebenen Pumpe 23 besteht. Die Saugseite der Pumpe 23 ist über ein Rückschlagventil 34 an die Eingangsseite des vorhin erwähnten Druckregelventils 17 bzw. die Ausgangsseite des ersten Trennventils 9 angeschlossen. Der Ausgang des Hochdruckspeichers 21 ist über ein Druckbegrenzungsventil 24 an einen Leitungsabschnitt 31 angeschlossen, der das erste Trennventil 9 mit dem analog regelbaren 2/2-Wegeventil 17 verbindet. Der Füllzustand des Hochdruckspeichers 21 wird mittels eines lediglich schematisch angedeuteten Wegsensors 25 überwacht.As can also be seen in the drawing, a motor-pump unit 20 serving as an external pressure source is provided with a high-pressure accumulator 21, which in turn consists of a pump 23 driven by an electric motor 22. The suction side of the pump 23 is connected via a check valve 34 to the input side of the pressure control valve 17 mentioned above or the output side of the first isolating valve 9. The outlet of the high-pressure accumulator 21 is connected via a pressure relief valve 24 to a line section 31 which connects the first isolating valve 9 to the 2/2-way valve 17 which can be regulated in an analog manner. The The filling state of the high-pressure accumulator 21 is monitored by means of a displacement sensor 25, which is only indicated schematically.
Eine dritte hydraulische Leitung 26 verbindet die Druckseite der Pumpe 23 bzw. den Ausgang des Hochdruckspeichers 21 mit der Eingangsseite von zwei elektromagnetisch betätigbaren, analog regelbaren, vorzugsweise stromlos geschlossenen (SG-) 2/2-Wege- bzw. Einlassventilen 27, 28, die den Radbremsen 7 und 8 vorgeschaltet sind und dem Aufbau eines hydraulischen Druckes in diesen Radbremsen dienen. Dem Abbau des in den Radbremsen 7, 9 eingesteuerten hydraulischen Druckes dienen zwei elektromagnetisch betätigbare, analog regelbare, vorzugsweise stromlos offene (SO-) 2/2-Wege- bzw. Auslassventile 29, 30, deren Ausgangsanschlüsse an den vorhin erwähnte Leitungsabschnitt 31 angeschlossen sind, Außerdem ist der Radbremse 7 ein Drucksensor 32 zugeordnet, mit dessen Hilfe der in der Radbremse 7 herrschende hydraulische Druck ermittelt wird. Der Ansteuerung des Motor-Pumpen-Aggregats 20, der vorhin erwähnten Ventile 9, 10, 17, 18, 27, 28, 29, 30, sowie der dem zweiten Bremskreis 12 zugeordneten Druckregelventile dient eine elektronische Steuer- und Regeleinheit ECU 34, der insbesondere die Ausgangssignale der Drucksensoren 13, 32, des Wegsensors 25 sowie einer vorzugsweise redundant ausgeführten Bremswunscherfassungs- einrichtung 33 zugeführt werden, die dem Hauptbremszylinder 3 zugeordnet ist.A third hydraulic line 26 connects the pressure side of the pump 23 or the output of the high-pressure accumulator 21 to the input side of two electromagnetically actuated, analog controllable, preferably normally closed (SG) 2/2-way or inlet valves 27, 28 are connected upstream of the wheel brakes 7 and 8 and serve to build up a hydraulic pressure in these wheel brakes. The reduction of the hydraulic pressure applied in the wheel brakes 7, 9 is served by two electromagnetically actuated, analog controllable, preferably normally open (SO) 2/2-way or exhaust valves 29, 30, the output connections of which are connected to the previously mentioned line section 31 In addition, the wheel brake 7 is assigned a pressure sensor 32, with the aid of which the hydraulic pressure prevailing in the wheel brake 7 is determined. An electronic control and regulating unit ECU 34, which in particular serves to control the motor-pump assembly 20, the valves 9, 10, 17, 18, 27, 28, 29, 30 and the pressure control valves assigned to the second brake circuit 12 the output signals of the pressure sensors 13, 32, the displacement sensor 25 and a preferably redundant brake request detection device 33, which is assigned to the master brake cylinder 3, are supplied.
Bei der in Fig. 2 dargestellten zweiten Ausführung der erfindungsgemäßen elektrohydraulischen Bremsanlage ist zwischen dem Ausgang des Hochdruckspeichers 21 und dem im Zusammenhang mit Fig. 1 erwähnten Leitungsabschnitt 31 ein analog regelbares 2/2-Wegeventil 35 mit Überdruckfunktion geschaltet. Außerdem ist zwischen dem Ausgang des Hochdruckspeichers 21 und der hydraulischen Leitung 26 ein analog regelbares, stromlos geschlossenes (SG-) 2/2- Wegeventil 36 vorgesehen, das, wenn in der Leitung 26 ein Druck gleich Null eingestellt ist, ein gezieltes Beaufschlagen der Radbremsen 7, 8,-,- mit einem definierten Druckmittelvolumen ermöglicht. Die durch die Drucksensoren 32, - ermittelten Druckwerte können dann zum Detektieren von sich im System befindlichen Gasen ausgewertet werden.In the second embodiment of the electrohydraulic brake system according to the invention shown in FIG. 2, an analog controllable 2/2-way valve 35 with overpressure function is connected between the outlet of the high-pressure accumulator 21 and the line section 31 mentioned in connection with FIG. In addition, between the outlet of the high pressure accumulator 21 and the hydraulic line 26 similarly controllable, normally closed (SG) 2/2-way valve 36 is provided which, when a pressure equal to zero is set in line 26, enables a targeted application of a defined pressure medium volume to the wheel brakes 7, 8, -. The pressure values determined by the pressure sensors 32 can then be evaluated to detect gases in the system.
Schließlich sind bei der in Fig. 3 gezeigten dritten Ausführung beide, den Druckräumen 4, 5 des Hauptbremszylinders 2 zugeordneten Trennventile 9, 10 als analog regelbare, stromlos offene (SO-) 2/2-Wegeventile ausgebildet. Die Ausgänge der Trennventile 9, 10 sind einerseits mit der Ausgangsseite der Auslassventile 29, 30, -, - und andererseits über stromlos geschlossene Schaltventile 37, - mit dem Druckmittelvorratsbehälter 6 verbunden. Außerdem ist der Ausgang des Hochdruckspeichers 21 über ein analog regelbares, stromlos geschlossenes (SG-) 2/2- Wegeventil 38 an den ersten Druckraum 4 des Hauptbremszylinders 2 angeschlossen.Finally, in the third embodiment shown in FIG. 3, both the isolation valves 9, 10 assigned to the pressure chambers 4, 5 of the master brake cylinder 2 are designed as analog-controllable, normally open (SO) 2/2-way valves. The outputs of the isolating valves 9, 10 are connected on the one hand to the outlet side of the outlet valves 29, 30, -, - and on the other hand to the pressure medium reservoir 6 via switching valves 37, - which are closed when de-energized. In addition, the output of the high-pressure accumulator 21 is connected to the first pressure chamber 4 of the master brake cylinder 2 via an analog controllable, normally closed (SG) 2/2-way valve 38.
Im nachfolgenden Text wird die Funktionsweise der in Fig. 1 gezeigten erfindungsgemäßen Bremsanlage näher erläutert.The mode of operation of the brake system according to the invention shown in FIG. 1 is explained in more detail in the text below.
Im unbetätigten Zustand des Bremspedals 1 befinden sich sämtliche Komponenten in der in der Zeichnung gezeigten Stellung, die dem stromlosen bzw. dem Bereitschaftszustand entspricht. Wird nun in der bevorzugten Brake-by-Wire- Betriebsart das Bremspedal 1 betätigt bzw. eine Druckaufbauphase eingeleitet, erzeugt dieIn the unactuated state of the brake pedal 1, all components are in the position shown in the drawing, which corresponds to the de-energized or the ready state. If the brake pedal 1 is actuated or a pressure build-up phase is initiated in the preferred brake-by-wire operating mode, the
Bremswunscherfassungseinrichtung 33 Steuersignale, die der vorhin erwähnten elektronischen Steuereinheit 34 zugeführt werden, die Ansteuersignale erzeugt, die dem Umschalten der im vorhergehenden Text beschriebenen Trenn-, Druckregel- sowie Schalventile dienen. Durch diese Ansteuersignale wird das erste Trennventil 9 geregelt aktiviert, das zweite Trennventil 10 geschlossen, und das Druckregelventil 17 geöffnet. Das Schaltventil 18, das in der Verbindung zwischen der Ausgangsseite der dem zweiten Bremskreis 12 zugeordneten Auslassventile mit dem Druckmittelvorratsbehälter 6 geschaltet ist, bleibt geschlossen. Gleichzeitig werden sämtliche Auslassventile 29, 30, -, - geschlossen und sämtliche Einlassventile 27, 28, -, - geöffnet, so dass die Radbremsen mit dem vom Hochdruckspeicher 21 gelieferten Druck beaufschlagt werden. Durch Verdrängen eines Druckmittelvolumens über das geregelt aktivierte erste Trennventil 9 sowie das offene Druckregelventil 17 in den Druckmittelvorratsbehälter 6, wird dem Fahrer ein Pedalgefühl vermittelt, das dem Pedalgefühl einer konventionellen Bremsanlage entspricht.Brake request detection device 33 control signals which are supplied to the previously mentioned electronic control unit 34 which generates control signals which are used to switch over the separating, pressure regulating as well as described in the preceding text Shutter valves are used. These control signals activate the first isolating valve 9 in a controlled manner, the second isolating valve 10 is closed, and the pressure control valve 17 is opened. The switching valve 18, which is connected in the connection between the outlet side of the outlet valves assigned to the second brake circuit 12 and the pressure medium reservoir 6, remains closed. At the same time, all outlet valves 29, 30, - are closed and all inlet valves 27, 28, - are opened, so that the wheel brakes are acted upon by the pressure supplied by the high-pressure accumulator 21. By displacing a pressure medium volume via the controlled activated first isolating valve 9 and the open pressure control valve 17 into the pressure medium reservoir 6, the driver is given a pedal feeling that corresponds to the pedal feeling of a conventional brake system.
Eine Druckhaltephase wird durch Umschalten der Einlassventile 27, 28, -, - in ihre geschlossenen Stellung eingeleitet.A pressure maintenance phase is initiated by switching the inlet valves 27, 28, -, - into their closed position.
Bei einem Druckabbau werden die Einlassventile 27, 28, -, - geschlossen und die entsprechenden Auslassventile 29, 30, -, - geregelt geöffnet. Außerdem werden auch die in den zum Druckmittelvorratsbehälter 6 führenden Leitungen geschalteten Ventile 17, 18 geöffnet.When the pressure drops, the inlet valves 27, 28, -, - are closed and the corresponding outlet valves 29, 30, -, - are opened in a controlled manner. In addition, the valves 17, 18 connected to the lines leading to the pressure medium reservoir 6 are also opened.
Bei einem Lösevorgang wird zunächst das in den Radbremsen 7, 8 verbrauchte Druckmittelvolumen verwendet, um die Hauptzylinderkolben zurück zu stellen. Dabei strömt dieses Druckmittelvolumen über die nun offenen Auslassventile 29, 30 sowie das geöffnete Trennventil 9 in den ersten Druckraum 4 des Hauptbremszylinders 2. Da diese Volumen in einigen Fällen nicht ausreicht, den Hauptzylinderkolben vollständig zurück zu stellen, werden auch die Einlassventile 27, 28 geöffnet, so dass vom Hochdruckspeicher 21 Druckmittelvolumen „nachgeschoben" werden kann. Die Nutzung des Volumens aus den Radbremsen ist energetisch vorteilhaft.During a loosening process, the pressure medium volume consumed in the wheel brakes 7, 8 is first used to reset the master cylinder pistons. This volume of pressure medium flows through the now open outlet valves 29, 30 and the opened isolating valve 9 into the first pressure chamber 4 of the master brake cylinder 2. Since in some cases this volume is not sufficient to reset the master cylinder piston completely, the inlet valves 27, 28 are also opened , so that 21 pressure medium volume from the high pressure accumulator Can be "pushed". The use of the volume from the wheel brakes is energetically advantageous.
Ähnlich verläuft der Lösevorgang auch bei der Ausführung gemäß Fig. 3. Zu diesem Zweck werden die vorhin erwähnten Schaltventile 37, - geschlossen, wobei das Nachströmen des vom Hochdruckspeicher 21 bereit gestellten Druckmittelvolumens bei geschlossenen Einlassventilen 27, 28 geregelt über das Druckregelventil 38 erfolgt. Zugleich werden die Auslassventile 29, 30, -, - geöffnet.The release process proceeds similarly in the embodiment according to FIG. 3. For this purpose, the switching valves 37, - mentioned above are closed, the pressure medium volume provided by the high-pressure accumulator 21 flowing in with closed inlet valves 27, 28 being regulated via the pressure control valve 38. At the same time, the outlet valves 29, 30, - are opened.
Bei einem Stromausfall, der beispielsweise durch einen Batteriedefekt, einen Kurzschluss oder durch Ausschalten der Zündung verursacht wird, geht die erfindungsgemäße Bremsanlage automatisch in eine Rückfallbetriebsart über, in der Fahrerbremsungen möglich sind. Dabei werden sowohl die Trennventile 9, 10 als auch die Auslassventile 29, 30, -, - in die in der Zeichnung gezeigte inaktive Schaltstellung umgeschaltet, so dass eine hydraulische Verbindung zwischen dem Hauptbremszylinder 3 und den Radbremsen freigegeben wird, über die ein Druckaufbau erfolgen kann. In the event of a power failure, which is caused, for example, by a battery defect, a short circuit or by switching off the ignition, the brake system according to the invention automatically switches to a fallback operating mode in which driver braking is possible. Both the isolation valves 9, 10 and the exhaust valves 29, 30, -, - are switched to the inactive switch position shown in the drawing, so that a hydraulic connection between the master cylinder 3 and the wheel brakes is released, via which pressure can be built up ,

Claims

Patentansprüche : Claims:
1. Elektrohydraulische Bremsanlage für Kraftfahrzeuge, die in einer Betriebsart „Brake-by-Wire" sowohl vom Fahrzeugführer als auch unabhängig vom Fahrzeugführer ansteuerbar ist, mit einem mittels eines Bremspedals betätigbaren, mindestens einen Druckraum aufweisenden Hauptbremszylinder, einem drucklosen Druckmittelvorratsbehälter, einer mittels einer elektronischen Steuer- und Regeleinheit ansteuerbaren hydraulischen Druckquelle, mit deren Druck Radbremsen des Fahrzeuges beaufschlagbar sind, die mittels mindestens einer durch ein Trennventil absperrbaren Verbindung an den Hauptbremszylinder angeschlossen sind und denen Druckregelventile bzw. Ein- und Auslassventile zugeordnet sind, die durch die elektronische Steuer- und Regeleinheit analog ansteuerbar sind und die die Radbremsen wahlweise mit der Druckquelle oder dem Druckmittelvorratsbehälter verbinden, sowie mit einer durch die elektronische Steuer- und Regeleinheit elektrisch steuerbaren Ventilanordnung, die in der Betriebsart „Brake-by-Wire" eine vorgewählte Nachgiebigkeit des Bremspedals durch Öffnen einer Ventileinrichtung ermöglicht, dadurch gekennzeichnet, dass die elektrisch steuerbare Ventilanordnung durch das Trennventil (9) , ein an die Ausgangsseite des Trennventils (9) angeschlossenes Druckregel- oder Steuerventil (17,37), dessen Ausgangsanschluss an den Druckmittelvorratsbehälter (6) angeschlossen ist, sowie weitere Ventile (27,28,29,30) gebildet ist, die ein Beaufschlagen des Druckraums (4) des HauptbremsZylinders (3) mit dem mindestens in einer Radbremse (7,8) eingesteuerten Druck und/oder dem von der Druckquelle (21) aufgebrachten Druck ermöglichen. 1. Electro-hydraulic brake system for motor vehicles, which can be controlled in a "brake-by-wire" operating mode both by the vehicle driver and independently of the vehicle driver, with a master brake cylinder which can be actuated by means of a brake pedal and has at least one pressure chamber, a pressureless pressure medium reservoir, and one using an electronic one Control and regulating unit controllable hydraulic pressure source, the pressure of which can be applied to the vehicle's wheel brakes, which are connected to the master brake cylinder by means of at least one connection which can be shut off by a separating valve and to which pressure control valves or inlet and outlet valves are assigned, which are controlled by the electronic control and Control unit can be controlled analogously and which connect the wheel brakes either with the pressure source or the pressure medium reservoir, as well as with a valve arrangement which can be electrically controlled by the electronic control and regulating unit and which is in operation sart "Brake-by-Wire" enables a preselected flexibility of the brake pedal by opening a valve device, characterized in that the electrically controllable valve arrangement through the isolating valve (9), a pressure regulating or control valve (17.) connected to the output side of the isolating valve (9) , 37), the output connection of which is connected to the pressure medium reservoir (6), and further valves (27, 28, 29, 30) are formed which act upon the pressure chamber (4) of the master brake cylinder (3) with the at least one wheel brake ( 7,8) allow controlled pressure and / or the pressure applied by the pressure source (21).
2. Elektrohydraulische Bremsanlage nach Anspruch 1 dadurch gekennzeichnet, dass das Trennventil (9) als ein analog regelbares, stromlos offenes (SO-) 2/2-Wegeventil ausgebildet ist.2. Electro-hydraulic brake system according to claim 1, characterized in that the isolating valve (9) is designed as an analog controllable, normally open (SO) 2/2-way valve.
3. Elektrohydraulische Bremsanlage nach Anspruch 1 oder 2 dadurch gekennzeichnet, dass das an die Ausgangsseite des Trennventils (9) angeschlossene Druckregelventil (17) als ein analog regelbares, stromlos geschlossenes (SG-) 2/2- Wegeventil ausgebildet ist.3. Electro-hydraulic brake system according to claim 1 or 2, characterized in that the pressure control valve (17) connected to the output side of the isolating valve (9) is designed as an analog controllable, normally closed (SG) 2/2-way valve.
4. Elektrohydraulische Bremsanlage nach Anspruch 1 oder 2 dadurch gekennzeichnet, dass das an die Ausgangsseite des Trennventils (9) angeschlossene Steuerventil (37) als ein stromlos geschlossenes (SG-) Schaltventil ausgebildet ist.4. Electro-hydraulic brake system according to claim 1 or 2, characterized in that the control valve (37) connected to the output side of the isolating valve (9) is designed as a normally closed (SG) switching valve.
5. Elektrohydraulische Bremsanlage nach Anspruch 1, 2 oder 3 dadurch gekennzeichnet, dass die Ventile, die ein Beaufschlagen des Druckraums (4) des HauptbremsZylinders (3). mit dem mindestens in einer Radbremse (7,8) eingesteuerten Druck ermöglichen, durch die an die Ausgangsseite des ersten Trennventils (9) angeschlossenen, den einzelnen Radbremsen (7,8) zugeordneten Auslassventile (29,30) gebildet sind.5. Electro-hydraulic brake system according to claim 1, 2 or 3, characterized in that the valves which act on the pressure chamber (4) of the master brake cylinder (3). enable with the pressure applied in at least one wheel brake (7, 8), formed by the outlet valves (29, 30) connected to the outlet side of the first separating valve (9) and assigned to the individual wheel brakes (7, 8).
6. Elektrohydraulische Bremsanlage nach einem der Ansprüche 1 bis 5 dadurch gekennzeichnet, dass die Ventile, die ein Beaufschlagen des Druckraums (4) des Hauptbremszylinders (3) mit dem von der Druckquelle (21) aufgebrachten Druck ermöglichen, durch die den einzelnen Radbremsen (7,8) zugeordneten Einlassventile (27,28) ^sowie die Auslassventile (29,30) gebildet sind. 6. Electro-hydraulic brake system according to one of claims 1 to 5, characterized in that the valves which allow the pressure chamber (4) of the master brake cylinder (3) to be acted upon by the pressure applied by the pressure source (21), through which the individual wheel brakes (7 , 8) associated inlet valves (27, 28) ^ and the outlet valves (29, 30) are formed.
7. Elektrohydraulische Bremsanlage nach einem der Ansprüche 1, bis 5 dadurch gekennzeichnet, dass zwischen der Druckquelle7. Electro-hydraulic brake system according to one of claims 1 to 5, characterized in that between the pressure source
(21) und dem Druckraum (4) des HauptbremsZylinders (3) ein analog regelbares Druckregelventil (38) geschaltet ist.(21) and the pressure chamber (4) of the master brake cylinder (3) an analog controllable pressure control valve (38) is connected.
8. Elektrohydraulische Bremsanlage nach einem der Ansprüche 1 bis 7 dadurch gekennzeichnet, dass die den Radbremsen8. Electro-hydraulic brake system according to one of claims 1 to 7, characterized in that the wheel brakes
(7,8,-,-) zugeordneten Einlassventile (27, 28, -, -) als stromlos geschlossene (SG-) 2/2-Wegeventile ausgebildet sind.(7,8, -, -) assigned inlet valves (27, 28, -, -) are designed as normally closed (SG) 2/2-way valves.
9. Elektrohydraulische Bremsanlage nach einem der Ansprüche 1 bis 8 dadurch gekennzeichnet, dass die den Radbremsen9. Electro-hydraulic brake system according to one of claims 1 to 8, characterized in that the wheel brakes
(7,8,-,-) zugeordneten Auslassventile (29, 30, -, -) als stromlos offene (SO-) 2/2-Wegeventile ausgebildet sind.(7,8, -, -) assigned exhaust valves (29, 30, -, -) are designed as normally open (SO) 2/2-way valves.
10. Elektrohydraulische Bremsanlage nach einem der Ansprüche 1 bis 4, wobei der Hauptbremszylinder als ein Tandemhauptzylinder ausgebildet ist, an dessen zweiten Druckraum unter Zwischenschaltung eines zweiten Trennventils ein zweiter Bremskreis angeschlossen ist, dadurch gekennzeichnet, dass die Ausgangsanschlüsse der Auslassventile, die dem zweiten Bremskreis zugeordnet sind, sowie der Ausgangsanschluss des zweiten Trennventils (10) über ein elektrisch ansteuerbares Schaltventil (18) mit dem Druckmittelvorratsbehälter (6) verbindbar sind.10. Electro-hydraulic brake system according to one of claims 1 to 4, wherein the master brake cylinder is designed as a tandem master cylinder, to the second pressure chamber with the interposition of a second isolating valve, a second brake circuit is connected, characterized in that the output connections of the exhaust valves associated with the second brake circuit and the output connection of the second isolating valve (10) can be connected to the pressure medium reservoir (6) via an electrically controllable switching valve (18).
11. Elektrohydraulische Bremsanlage nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass zwischen dem Ausgangsanschluss der Druckquelle (21) und dem ersten Trennventil (9) ein Druckregelventil (35) mit Überdruckfunktion angeschlossen ist, das beim offenen ersten Trennventil (9) ein geregeltes Beaufschlagen des Druckraums (4) des HauptbremsZylinders (2) mit dem von der Druckquelle (21) aufgebrachten Druck ermöglicht.11. Electro-hydraulic brake system according to one of claims 1 to 6, characterized in that between the output connection of the pressure source (21) and the first isolating valve (9), a pressure control valve (35) with positive pressure function is connected, which when the first isolating valve (9) is open regulated loading of the Pressure chamber (4) of the master brake cylinder (2) with the pressure applied by the pressure source (21).
12. Elektrohydraulische Bremsanlage nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass in der Verbindung zwischen der Druckquelle (21) und der Eingangsseite der Einlassventile (27,28) ein analog regelbares Druckregelventil (36) geschaltet ist.12. Electro-hydraulic brake system according to one of claims 1 to 6, characterized in that in the connection between the pressure source (21) and the input side of the inlet valves (27, 28) an analog controllable pressure control valve (36) is connected.
13. Elektrohydraulische Bremsanlage nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass zwischen dem Hauptbremszylinder und dem Trennventil hydraulischmechanische Mittel vorgesehen sind, die in der Betriebsart „Brake-by-Wire" eine vorgewählte Nachgiebigkeit des Bremspedals ermöglichen. 13. Electrohydraulic brake system according to one of claims 1 to 12, characterized in that hydraulic-mechanical means are provided between the master brake cylinder and the isolation valve, which enable a preselected flexibility of the brake pedal in the "Brake-by-Wire" operating mode.
EP02801314A 2001-10-12 2002-10-04 Eletrohydraulic braking system for motor vehicles Withdrawn EP1439992A1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE10150587 2001-10-12
DE10150584 2001-10-12
DE10150587 2001-10-12
DE10150584 2001-10-12
DE10232872 2002-07-19
DE10232872A DE10232872B4 (en) 2001-10-12 2002-07-19 Electrohydraulic brake system for motor vehicles
PCT/EP2002/011171 WO2003033323A1 (en) 2001-10-12 2002-10-04 Eletrohydraulic braking system for motor vehicles

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EP1439992A1 true EP1439992A1 (en) 2004-07-28

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EP02801314A Withdrawn EP1439992A1 (en) 2001-10-12 2002-10-04 Eletrohydraulic braking system for motor vehicles

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US (1) US20040262993A1 (en)
EP (1) EP1439992A1 (en)
JP (1) JP4247832B2 (en)
WO (1) WO2003033323A1 (en)

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FR2874880B1 (en) * 2004-09-08 2008-01-25 Bosch Gmbh Robert BRAKING DEVICE FOR MOTOR VEHICLE
US20080179944A1 (en) * 2007-01-29 2008-07-31 Continental Teves, Inc. Hydraulic anti-lock brake system
DE102007059901A1 (en) * 2007-12-12 2009-06-18 Robert Bosch Gmbh Electrohydraulic power vehicle brake system
DE102008001504A1 (en) * 2008-04-30 2009-11-05 Robert Bosch Gmbh Device and method for braking pressure control
DE102009033499A1 (en) * 2008-07-18 2010-01-21 Continental Teves Ag & Co. Ohg Brake system for motor vehicles
JP5297748B2 (en) * 2008-10-01 2013-09-25 トヨタ自動車株式会社 Brake control device
DE102014212538A1 (en) * 2014-06-30 2015-12-31 Continental Teves Ag & Co. Ohg Arrangement for a hydraulic motor vehicle brake system and brake system with such an arrangement
DE102015212552A1 (en) * 2014-07-21 2016-01-21 Continental Teves Ag & Co. Ohg Arrangement for a hydraulic motor vehicle brake system and brake system with such an arrangement

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DE4340467C2 (en) * 1993-11-27 2002-03-14 Bosch Gmbh Robert Hydraulic vehicle brake system working with external power
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JP4247832B2 (en) 2009-04-02
US20040262993A1 (en) 2004-12-30
WO2003033323A1 (en) 2003-04-24

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