WO2000010855A1 - Hydraulic brake system with anti-slip system - Google Patents
Hydraulic brake system with anti-slip system Download PDFInfo
- Publication number
- WO2000010855A1 WO2000010855A1 PCT/EP1999/006005 EP9906005W WO0010855A1 WO 2000010855 A1 WO2000010855 A1 WO 2000010855A1 EP 9906005 W EP9906005 W EP 9906005W WO 0010855 A1 WO0010855 A1 WO 0010855A1
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- WO
- WIPO (PCT)
- Prior art keywords
- brake system
- hydraulic
- check valve
- motor
- pump
- 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.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/0008—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using accumulators
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- 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
- B60T17/02—Arrangements of pumps or compressors, or control devices therefor
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- 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
- B60T8/341—Systems characterised by their valves
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- 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
- B60T8/4013—Fluid pressurising means for more than one fluid circuit, e.g. separate pump units used for hydraulic booster and anti-lock braking
-
- 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
- B60T8/42—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 having expanding chambers for controlling pressure, i.e. closed systems
- B60T8/4275—Pump-back systems
- B60T8/4291—Pump-back systems having means to reduce or eliminate pedal kick-back
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
- B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
- B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
- B60T8/48—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition connecting the brake actuator to an alternative or additional source of fluid pressure, e.g. traction control systems
- B60T8/4809—Traction control, stability control, using both the wheel brakes and other automatic braking systems
- B60T8/4827—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems
- B60T8/4863—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems
- B60T8/4872—Traction control, stability control, using both the wheel brakes and other automatic braking systems in hydraulic brake systems closed systems pump-back systems
Definitions
- the invention relates to a hydraulic brake system with a slip control system, which comprises a motor and a hydraulic pump which can be driven thereby, with at least one displacement space, and with a damping chamber connected to a pressure side of the hydraulic pump, the motor being provided for driving an auxiliary energy pump.
- the auxiliary power pump will in many cases be a vacuum pump, since in modern injection engines there is generally no source available for generating a sufficiently high vacuum.
- a vacuum pump also requires a drive motor. Since such an engine incurs additional costs and would also have to create corresponding space, a possibility was sought to use an existing engine.
- the motor that drives the hydraulic pump (s) required for this control system is suitable for this. Since the slip control is only relatively rarely active, the motor is also only used relatively weakly and could therefore use its free capacities to drive a vacuum pump or the like. provide.
- the invention is therefore based on the object of creating a hydraulic brake system with a slip control system of the type mentioned, in which these pulsations are substantially less or eliminated.
- a first check valve device is arranged at an outlet of the damping chamber, with which hydraulic fluid penetration into the displacement chamber is prevented when the brake system is actuated.
- a second check valve device is preferably arranged between the pressure side of the hydraulic pump and the damping chamber.
- the first check valve device is preferably a ball check valve, which can have a sealing body made of an elastomer.
- a first sensor device can be provided with which the motor can be deactivated when an actuation of the brake system is detected.
- a second sensor device is preferably used to detect a vacuum pressure generated by the vacuum pump in the brake system and to deactivate the motor when the vacuum pressure falls below a predetermined value.
- Fig. 1 is a schematic diagram of the hydraulic control unit of such a brake system.
- the brake system comprises a master cylinder 1, which can be operated via a brake pedal 3 and a brake booster 4.
- a hydraulic reservoir 2 is connected to the master cylinder 1 in a known manner.
- Two brake circuits 100, 200 are connected to the master cylinder 1 via a first line 5 or a second line 6.
- Two wheel brakes 7, 8 and 9, 10 are actuated via each brake circuit. Since the brake circuits are constructed identically, only one brake circuit to be discribed. However, these explanations also apply in the same way to the other brake circuit.
- the first line 5 is guided in the brake circuit 100 via a first, normally open isolating valve 11 and then branches into a first braking branch 51 and a second braking branch 52.
- a first, normally open inlet valve 12 for the wheel brake 7 and a first, normally closed exhaust valve 13, the output of which is connected to a low-pressure accumulator 16.
- the second brake branch 52 is guided into the low-pressure accumulator 16 via a second, normally open inlet valve 14 for the wheel brake 8 and a second, normally closed outlet valve 15.
- a hydraulic pump 18 To empty the low-pressure accumulator 16, it is connected to the suction side of a hydraulic pump 18, which is separated from the first line 5 by a second, normally open, isolation valve 17.
- the pressure side of the hydraulic pump 18 is connected via a damping chamber 19 to the junction between the first and second brake branches 51, 52.
- the outlet of the damping chamber 19 located at the branch is secured with a first check valve 20 against the ingress of hydraulic fluid.
- a second check valve 18a lies between the inlet of the damping chamber 19 and the pressure side of the hydraulic pump 18, while the suction side of the hydraulic pump 18 is connected to the low-pressure accumulator 16 via a third check valve 18b.
- the hydraulic pump 18 is driven by a motor 21.
- the motor 21 simultaneously drives an auxiliary energy pump 22, which in the case shown is a vacuum pump " acts, which serves to maintain a vacuum with which the brake booster 4 is operated.
- this hydraulic brake system is activated by actuating the brake pedal 3, as a result of which the hydraulic pressure in the brake branches 51, 52 increases and the wheel brakes engage. As soon as one of the wheels threatens to lock, the corresponding outlet valve 13; 15 opened and the hydraulic pressure reduced via the low pressure accumulator 16.
- the motor 21 is started, for example by means of a pressure sensor (not shown), so that the hydraulic pump 18 conveys the hydraulic fluid present in the low-pressure accumulator 16 back into the brake circuit via the damping chamber 19.
- the motor 21 is also activated when the vacuum generated with the vacuum pump 22 no longer has the required negative pressure.
- the hydraulic pump 18 naturally also runs when the low-pressure accumulator 16 is empty.
- the first check valve 20 blocks the outlet of the damping chamber 19 and thereby prevents hydraulic fluid from entering the displacement chamber of the hydraulic pump 18 via the damping chamber 19. The pulsation noises mentioned at the beginning cannot therefore arise.
- a first sensor device 30 can be provided as an additional measure, with which an actuation of the brake pedal 3 or the master cylinder 1 is detected.
- the first sensor device deactivates the motor 21 and thus the hydraulic pump 18, so that even if both the first and the second check valve 20, 18a are defective, no pulsation noises can occur.
- a second sensor device 31 can be provided with which the vacuum pressure is detected and, if necessary, the deactivation of the motor 21 is canceled.
- the first check valve can of course also be used if the motor is not intended to drive an auxiliary power pump or is to be retrofitted with such a pump only later. In this case, the first check valve relieves the second check valve in that the pressure drop is now distributed over two valves.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- General Engineering & Computer Science (AREA)
- Regulating Braking Force (AREA)
Abstract
Description
Hydraulische Bremsanlage mit SchlupfregelsystemHydraulic brake system with slip control system
Die Erfindung betrifft eine hydraulische Bremsanlage mit einem Schlupfregelsystem, das einen Motor und eine durch diesen antreibbare Hydraulikpumpe mit mindestens einem Verdrängerraum umfaßt, sowie mit einer mit einer Druckseite der Hydraulikpumpe verbundenen Dämpfungskammer, wobei der Motor zum Antrieb einer Hilfsenergiepumpe vorgesehen ist.The invention relates to a hydraulic brake system with a slip control system, which comprises a motor and a hydraulic pump which can be driven thereby, with at least one displacement space, and with a damping chamber connected to a pressure side of the hydraulic pump, the motor being provided for driving an auxiliary energy pump.
Die Hilfsenergiepumpe wird in vielen Fällen eine Vakuumpumpe sein, da in modernen Einspritzmotoren im allgemeinen keine Quelle zur Erzeugung eines ausreichend hohen Vakuums zur Verfügung steht. Allerdings erfordert eine Vakuumpumpe auch einen Antriebsmotor. Da ein solcher Motor zusätzliche Kosten verursacht und auch entsprechender Platz geschaffen werden müßte, wurde nach einer Möglichkeit gesucht, einen vorhandenen Motor zu nutzen. Hierfür bietet sich bei einer Bremsanlage mit einem Schlupfregelsystem (Antriebs- und/oder Bremsschlupfregelung) der Motor an, der die für dieses Regelsystem erforderliche(n) Hydraulikpumpe (n) antreibt. Da die Schlupf- regelung nur relativ selten aktiv ist, ist auch der Motor nur relativ schwach ausgelastet und könnte somit seine freien Kapazitäten zum Antrieb einer Vakuumpumpe o.a. zur Verfügung stellen.The auxiliary power pump will in many cases be a vacuum pump, since in modern injection engines there is generally no source available for generating a sufficiently high vacuum. However, a vacuum pump also requires a drive motor. Since such an engine incurs additional costs and would also have to create corresponding space, a possibility was sought to use an existing engine. For a brake system with a slip control system (drive and / or brake slip control), the motor that drives the hydraulic pump (s) required for this control system is suitable for this. Since the slip control is only relatively rarely active, the motor is also only used relatively weakly and could therefore use its free capacities to drive a vacuum pump or the like. provide.
Eine solche Vakuumpumpe muß immer dann in Betrieb gesetzt werden, wenn der durch einen Drucksensor erfaßte Vakuumdruck, der zum Beispiel zum Antrieb eines Bremskraftverstärkers benötigt wird, unter einen bestimmten Wert abgefallen ist. Ein Problem hierbei besteht jedoch darin, daß in dem Fall, in dem die Vakuumpumpe (oder eine andere Hilfsenergiepumpe)Such a vacuum pump must always be put into operation when the vacuum pressure detected by a pressure sensor, which is required, for example, to drive a brake booster, has dropped below a certain value. One problem with this, however, is that in the event that the vacuum pump (or other auxiliary power pump)
betrieben wird, zwangsläufig auch die Hydraulikpumpe für die Schlupfregelung, die ebenfalls fest an den Motor gekoppelt ist, mitläuft. Wenn nun gleichzeitig die Bremsanlage durch Treten auf das Bremspedal aktiviert wird, wird in dem Leitungssystem ein Druck aufgebaut, der dazu führen kann, daß Hydraulikflüssigkeit von der Druckseite her über die Dämpfungskammer in den Verdrängerraum der Hydraulikpumpe eindringt. Dies ist im allgemeinen trotz eines an der Druckseite vorhandenen Rückschlagventils nicht ganz zu vermeiden, da diese Ventile häufig zumindest geringe Undichtigkeiten aufweisen.is operated, the hydraulic pump for the slip control, which is also firmly coupled to the engine, inevitably runs. If the brake system is activated at the same time by stepping on the brake pedal, a pressure is built up in the line system, which can lead to hydraulic fluid penetrating from the pressure side into the displacement chamber of the hydraulic pump via the damping chamber. In general, this cannot be completely avoided despite a check valve on the pressure side, since these valves often have at least slight leaks.
Durch die mitlaufende Hydraulikpumpe wird die Flüssigkeit natürlich sofort wieder aus dem Verdrängerraum herausgedrückt. Dieser Vorgang verursacht sehr störende Pulsationen, die einen Fahrer beim Bremsen irritieren können.Due to the hydraulic pump running along, the liquid is of course immediately pushed out of the displacement chamber. This process causes very disturbing pulsations that can irritate a driver when braking.
Der Erfindung liegt deshalb die Aufgabe zugrunde, eine hydraulische Bremsanlage mit einem Schlupfregelsystem der eingangs genannten Art zu schaffen, bei der diese Pulsationen wesentlich geringer oder beseitigt sind.The invention is therefore based on the object of creating a hydraulic brake system with a slip control system of the type mentioned, in which these pulsations are substantially less or eliminated.
Gelöst wird diese Aufgabe bei einer solchen hydraulischen Bremsanlage dadurch, daß an einem Ausgang der Dämpfungskammer eine erste Rückschlagventileinrichtung angeordnet ist, mit der bei Betätigung der Bremsanlage ein Eindringen von Hydraulikflüssigkeit in den Verdrängerraum verhindert wird.This object is achieved in such a hydraulic brake system in that a first check valve device is arranged at an outlet of the damping chamber, with which hydraulic fluid penetration into the displacement chamber is prevented when the brake system is actuated.
Die Unteransprüche haben vorteilhafte Weiterbildungen der Erfindung zum Inhalt. Demgemäß ist zwischen der Druckseite der Hydraulikpumpe und der Dämpfungskammer vorzugsweise eine zweite Rückschlagventileinrichtung angeordnet.The dependent claims contain advantageous developments of the invention. Accordingly, a second check valve device is preferably arranged between the pressure side of the hydraulic pump and the damping chamber.
Die erste Rückschlagventileinrichtung ist vorzugsweise ein Kugelrückschlagventil, das einen Dichtkörper aus einem Elastomer aufweisen kann.The first check valve device is preferably a ball check valve, which can have a sealing body made of an elastomer.
Weiterhin kann eine erste Sensoreinrichtung vorgesehen sein, mit der bei Erfassung einer Betätigung der Bremsanlage der Motor deaktivierbar ist.Furthermore, a first sensor device can be provided with which the motor can be deactivated when an actuation of the brake system is detected.
Eine zweite Sensoreinrichtung dient vorzugsweise zum Erfassen eines von der Vakuumpumpe erzeugten Vakuumdrucks in der Bremsanlage sowie zum Aufheben einer Deaktivierung des Motors, wenn der Vakuumdruck einen vorbestimmten Wert unterschreitet.A second sensor device is preferably used to detect a vacuum pressure generated by the vacuum pump in the brake system and to deactivate the motor when the vacuum pressure falls below a predetermined value.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung einer bevorzugten Ausführungsform anhand der Zeichnung. Es zeigt:Further details, features and advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawing. It shows:
Fig. 1 ein schematisches Schaltbild der hydraulischen Steuereinheit einer solchen Bremsanlage.Fig. 1 is a schematic diagram of the hydraulic control unit of such a brake system.
Die Bremsanlage umfaßt einen Hauptzylinder 1, der über ein Bremspedal 3 und einen Bremskraftverstärker 4 betätigt werden kann. Mit dem Hauptzylinder 1 ist in bekannter Weise ein Hydraulik-Vorratsbehälter 2 verbunden.The brake system comprises a master cylinder 1, which can be operated via a brake pedal 3 and a brake booster 4. A hydraulic reservoir 2 is connected to the master cylinder 1 in a known manner.
An den Hauptzylinder 1 sind über eine erste Leitung 5 bzw. eine zweite Leitung 6 zwei Bremskreise 100, 200 angeschlossen. Über jeden Bremskreis werden jeweils zwei Radbremsen 7, 8 beziehungsweise 9, 10 betätigt. Da die Bremskreise identisch aufgebaut sind, soll im folgenden nur ein Bremskreis- beschrieben werden. Diese Erläuterungen gelten in gleicher Weise jedoch auch für den anderen Bremskreis.Two brake circuits 100, 200 are connected to the master cylinder 1 via a first line 5 or a second line 6. Two wheel brakes 7, 8 and 9, 10 are actuated via each brake circuit. Since the brake circuits are constructed identically, only one brake circuit to be discribed. However, these explanations also apply in the same way to the other brake circuit.
Die erste Leitung 5 wird in dem Bremskreis 100 über ein erstes, stromlos offenes Trennventil 11 geführt und verzweigt sich anschließend in einen ersten Bremszweig 51 und einen zweiten Bremszweig 52. In dem ersten Bremszweig 51 liegt ein erstes, stromlos offenes Einlaßventil 12 für die Radbremse 7, sowie ein erstes, stromlos geschlossenes Auslaßventil 13, dessen Ausgang mit einem Niederdruckspeicher 16 verbunden ist.The first line 5 is guided in the brake circuit 100 via a first, normally open isolating valve 11 and then branches into a first braking branch 51 and a second braking branch 52. In the first braking branch 51 there is a first, normally open inlet valve 12 for the wheel brake 7 , and a first, normally closed exhaust valve 13, the output of which is connected to a low-pressure accumulator 16.
Der zweite Bremszweig 52 ist über ein zweites, stromlos offenes Einlaßventil 14 für die Radbremse 8 und ein zweites, stromlos geschlossenes Auslaßventil 15 in den Niederdruckspeicher 16 geführt.The second brake branch 52 is guided into the low-pressure accumulator 16 via a second, normally open inlet valve 14 for the wheel brake 8 and a second, normally closed outlet valve 15.
Zum Entleeren des Niederdruckspeichers 16 ist dieser mit der Ansaugseite einer Hydraulikpumpe 18 verbunden, die durch ein zweites, stromlos offenes Trennventil 17 von der ersten Leitung 5 getrennt ist. Die Druckseite der Hydraulikpumpe 18 ist über eine Dämpfungskammer 19 mit der Verzweigung zwischen dem ersten und zweiten Bremszweig 51, 52 verbunden. Der an der Verzweigung liegende Ausgang der Dämpfungskammer 19 ist mit einem ersten Rückschlagventil 20 gegen ein Eindringen von Hydraulikflüssigkeit gesichert. Zwischen dem Eingang der Dämpfungskammer 19 und der Druckseite der Hydraulikpumpe 18 liegt ein zweites Rückschlagventil 18a, während die Ansaugseite der Hydraulikpumpe 18 über ein drittes Rückschlagventil 18b mit dem Niederdruckspeicher 16 verbunden ist.To empty the low-pressure accumulator 16, it is connected to the suction side of a hydraulic pump 18, which is separated from the first line 5 by a second, normally open, isolation valve 17. The pressure side of the hydraulic pump 18 is connected via a damping chamber 19 to the junction between the first and second brake branches 51, 52. The outlet of the damping chamber 19 located at the branch is secured with a first check valve 20 against the ingress of hydraulic fluid. A second check valve 18a lies between the inlet of the damping chamber 19 and the pressure side of the hydraulic pump 18, while the suction side of the hydraulic pump 18 is connected to the low-pressure accumulator 16 via a third check valve 18b.
Die Hydraulikpumpe 18 wird mit einem Motor 21 angetrieben. Der Motor 21 treibt gleichzeitig eine Hilfsenergiepumpe 22, bei der es sich im dargestellten Fall um eine Vakuumpumpe" handelt, die zur Aufrechterhaltung eines Vakuums dient, mit dem der Bremskraftverstärker 4 betrieben wird.The hydraulic pump 18 is driven by a motor 21. The motor 21 simultaneously drives an auxiliary energy pump 22, which in the case shown is a vacuum pump " acts, which serves to maintain a vacuum with which the brake booster 4 is operated.
Die Funktion dieser hydraulischen Bremsanlage wird durch eine Betätigung des Bremspedals 3 aktiviert, wodurch der Hydraulikdruck in den Bremszweigen 51, 52 ansteigt und die Radbremsen eingreifen. Sobald ein Blockieren eines der Räder droht, wird über eine Steuereinheit (nicht dargestellt) das entsprechende Auslaßventil 13; 15 geöffnet und der Hydraulikdruck über den Niederdruckspeicher 16 abgebaut.The function of this hydraulic brake system is activated by actuating the brake pedal 3, as a result of which the hydraulic pressure in the brake branches 51, 52 increases and the wheel brakes engage. As soon as one of the wheels threatens to lock, the corresponding outlet valve 13; 15 opened and the hydraulic pressure reduced via the low pressure accumulator 16.
Zum Entleeren des Niederdruckspeichers 16 wird der Motor 21 zum Beispiel mittels eines Drucksensors (nicht dargestellt) in Betrieb gesetzt, so daß die Hydraulikpumpe 18 die in dem Niederdruckspeicher 16 vorhandene Hydraulikflüssigkeit über die Dämpfungskammer 19 wieder in den Bremskreis fördert.To empty the low-pressure accumulator 16, the motor 21 is started, for example by means of a pressure sensor (not shown), so that the hydraulic pump 18 conveys the hydraulic fluid present in the low-pressure accumulator 16 back into the brake circuit via the damping chamber 19.
Unabhängig davon wird der Motor 21 außerdem dann aktiviert, wenn das mit der Vakuumpumpe 22 erzeugte Vakuum nicht mehr den erforderlichen Unterdruck aufweist. Dabei läuft die Hydraulikpumpe 18 natürlich auch dann mit, wenn der Niederdruckspeicher 16 leer ist. Wenn in diesem Betriebsfall die Bremse betätigt wird und der Hydraulikdruck in dem Bremskreis ansteigt, sperrt das erste Rückschlagventil 20 den Ausgang der Dämpfungskammer 19 und verhindert dadurch, daß Hydraulikflüssigkeit über die Dämpfungskammer 19 in den Verdrängerraum der Hydraulikpumpe 18 gelangt. Die eingangs genannten Pulsa- tionsgeräusche können somit nicht entstehen.Regardless of this, the motor 21 is also activated when the vacuum generated with the vacuum pump 22 no longer has the required negative pressure. The hydraulic pump 18 naturally also runs when the low-pressure accumulator 16 is empty. In this operating case, when the brake is actuated and the hydraulic pressure in the brake circuit increases, the first check valve 20 blocks the outlet of the damping chamber 19 and thereby prevents hydraulic fluid from entering the displacement chamber of the hydraulic pump 18 via the damping chamber 19. The pulsation noises mentioned at the beginning cannot therefore arise.
Selbst in dem Fall, in dem das erste Rückschlagventil 20 einmal undicht sein sollte, steht noch die Dämpfungskammer 19 zur Aufnahme der Flüssigkeit zur Verfügung, so daß diese nicht unmittelbar in den Verdrängerraum der Pumpe 18 gelangen kann. Dazu trägt auch bei, daß die Druckdifferenz an dem" zweiten Rückschlagventil 18a aufgrund des ersten Rückschlagventils 20 relativ gering bleibt.Even in the event that the first check valve 20 should ever leak, the damping chamber 19 is still available for receiving the liquid, so that it cannot get directly into the displacement space of the pump 18. The fact that the pressure difference across the " second check valve 18a remains relatively low due to the first check valve 20.
Zur Unterstützung dieser Funktion kann als Zusatzmaßnahme eine erste Sensoreinrichtung 30 vorgesehen sein, mit der eine Betätigung des Bremspedals 3 bzw. des Hauptzylinders 1 erkannt wird. Die erste Sensoreinrichtung deaktiviert in diesem Fall den Motor 21 und damit die Hydraulikpumpe 18, so daß selbst dann, wenn sowohl das erste, als auch das zweite Rückschlagventil 20, 18a defekt ist, keine Pulsationsgeräusche auftreten können.To support this function, a first sensor device 30 can be provided as an additional measure, with which an actuation of the brake pedal 3 or the master cylinder 1 is detected. In this case, the first sensor device deactivates the motor 21 and thus the hydraulic pump 18, so that even if both the first and the second check valve 20, 18a are defective, no pulsation noises can occur.
Um andererseits zu verhindern, daß der Motor 21 längere Zeit nicht läuft und dadurch der Vakuumdruck in unzulässiger Weise abfällt, kann eine zweite Sensoreinrichtung 31 vorgesehen sein, mit der der Vakuumdruck erfaßt und gegebenenfalls die Deaktivierung des Motors 21 aufgehoben wird.On the other hand, in order to prevent the motor 21 from not running for a longer period of time and thereby the vacuum pressure dropping in an impermissible manner, a second sensor device 31 can be provided with which the vacuum pressure is detected and, if necessary, the deactivation of the motor 21 is canceled.
Insgesamt wird somit bei geringem Aufwand eine besonders betriebssichere Vakuumquelle geschaffen, für die kein zusätzlicher Motor erforderlich ist, sondern die mit einem Motor eines Schlupfregelsystems angetrieben wird, ohne daß dadurch Störgeräusche in dem System erzeugt werden.All in all, a particularly reliable vacuum source is thus created with little effort, for which no additional motor is required, but which is driven by a motor of a slip control system, without thereby generating noise in the system.
Prinzipiell ist das erste Rückschlagventil natürlich auch dann einsetzbar, wenn der Motor nicht zum Antrieb einer Hilf- senergiepumpe vorgesehen ist oder erst später mit einer solchen Pumpe nachgerüstet werden soll. In diesem Fall entlastet das erste Rückschlagventil das zweite Rückschlagventil, indem der Druckabfall nun auf zwei Ventile verteilt ist. BezugszeichenlisteIn principle, the first check valve can of course also be used if the motor is not intended to drive an auxiliary power pump or is to be retrofitted with such a pump only later. In this case, the first check valve relieves the second check valve in that the pressure drop is now distributed over two valves. Reference list
1 - Hauptzylinder1 - master cylinder
2 - Vorratsbehälter2 - storage container
3 - Bremspedal3 - Brake pedal
4 - Bremskraftverstärker4 - brake booster
5 - erste Leitung5 - first line
6 - zweite Leitung6 - second line
7, 8, 9, 10 - Radbremsen7, 8, 9, 10 - wheel brakes
11 - erstes Trennventil11 - first isolating valve
12 - erstes Einlaßventil12 - first intake valve
13 - erstes Auslaßventil13 - first exhaust valve
14 - zweites Einlaßventil14 - second inlet valve
15 - zweites Auslaßventil15 - second exhaust valve
16 - Niederdruckspeicher16 - low pressure accumulator
17 - zweites Trennventil17 - second isolation valve
18 - Hydraulikventil18 - hydraulic valve
18a, 18b - zweites bzw. drittes Rückschlagventil18a, 18b - second or third check valve
19 - Dämpfungskammer19 - damping chamber
20 - erstes Rückschlagventil20 - first check valve
21 - Motor21 - engine
22 - Vakuumpumpe22 - vacuum pump
30, 31 - erste bzw. zweite Sensoreinrichtung 51, 52 - erster bzw. zweiter Bremszweig 100, 200 - erster bzw. zweiter Bremskreis 30, 31 - first or second sensor device 51, 52 - first or second brake branch 100, 200 - first or second brake circuit
Claims
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19837371.6 | 1998-08-18 | ||
| DE19837371 | 1998-08-18 | ||
| DE19859072A DE19859072A1 (en) | 1998-08-18 | 1998-12-21 | Hydraulic brake system with slip control system |
| DE19859072.5 | 1998-12-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2000010855A1 true WO2000010855A1 (en) | 2000-03-02 |
Family
ID=26048222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1999/006005 Ceased WO2000010855A1 (en) | 1998-08-18 | 1999-08-17 | Hydraulic brake system with anti-slip system |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2000010855A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2128168A1 (en) * | 1971-06-07 | 1972-12-14 | Teldix Gmbh | Anti-lock control system for vehicles |
| WO1990011212A1 (en) * | 1989-03-21 | 1990-10-04 | Alfred Teves Gmbh | Antilock hydraulic braking system |
| WO1991005688A1 (en) * | 1989-10-19 | 1991-05-02 | Robert Bosch Gmbh | Braking system |
| DE4321787A1 (en) * | 1992-07-25 | 1994-03-03 | Wolter Hans | Non-return spring-loaded ball valve for dosing pump - forms valve seat with annular sealing edge having diameter smaller than that of elastomeric ball, and joined by spherical sealing edge to second annular edge |
| WO1995031362A1 (en) * | 1994-05-16 | 1995-11-23 | Itt Automotive Europe Gmbh | Brake system for motor vehicles with pneumatic brake booster |
| WO1997018114A1 (en) * | 1995-11-15 | 1997-05-22 | Lucas Industries Plc | Electronically adjustable brake system for motor vehicles |
| WO1997018977A1 (en) * | 1995-11-18 | 1997-05-29 | Itt Automotive Europe Gmbh | Hydraulic vehicle brake system with wheel slip control |
-
1999
- 1999-08-17 WO PCT/EP1999/006005 patent/WO2000010855A1/en not_active Ceased
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2128168A1 (en) * | 1971-06-07 | 1972-12-14 | Teldix Gmbh | Anti-lock control system for vehicles |
| WO1990011212A1 (en) * | 1989-03-21 | 1990-10-04 | Alfred Teves Gmbh | Antilock hydraulic braking system |
| WO1991005688A1 (en) * | 1989-10-19 | 1991-05-02 | Robert Bosch Gmbh | Braking system |
| DE4321787A1 (en) * | 1992-07-25 | 1994-03-03 | Wolter Hans | Non-return spring-loaded ball valve for dosing pump - forms valve seat with annular sealing edge having diameter smaller than that of elastomeric ball, and joined by spherical sealing edge to second annular edge |
| WO1995031362A1 (en) * | 1994-05-16 | 1995-11-23 | Itt Automotive Europe Gmbh | Brake system for motor vehicles with pneumatic brake booster |
| WO1997018114A1 (en) * | 1995-11-15 | 1997-05-22 | Lucas Industries Plc | Electronically adjustable brake system for motor vehicles |
| WO1997018977A1 (en) * | 1995-11-18 | 1997-05-29 | Itt Automotive Europe Gmbh | Hydraulic vehicle brake system with wheel slip control |
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