DE102009000577A1 - Hydraulic brake system for e.g. anti-lock braking system regulation, has electronic control designed such that return pump is automatically switched on by electronic control when brake pressure exceeds predetermined threshold value - Google Patents

Hydraulic brake system for e.g. anti-lock braking system regulation, has electronic control designed such that return pump is automatically switched on by electronic control when brake pressure exceeds predetermined threshold value Download PDF

Info

Publication number
DE102009000577A1
DE102009000577A1 DE200910000577 DE102009000577A DE102009000577A1 DE 102009000577 A1 DE102009000577 A1 DE 102009000577A1 DE 200910000577 DE200910000577 DE 200910000577 DE 102009000577 A DE102009000577 A DE 102009000577A DE 102009000577 A1 DE102009000577 A1 DE 102009000577A1
Authority
DE
Germany
Prior art keywords
electronic control
brake
brake pressure
pressure
return 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.)
Granted
Application number
DE200910000577
Other languages
German (de)
Inventor
Ulrich Mahlenbrey
Ulrike Mueller
Michael Kunz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE200910000577 priority Critical patent/DE102009000577A1/en
Priority to CN201010113356.8A priority patent/CN101797918B/en
Publication of DE102009000577A1 publication Critical patent/DE102009000577A1/en
Granted 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
    • B60T8/404—Control of the pump unit
    • B60T8/4045—Control of the pump unit involving ON/OFF switching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/404—Control of the pump unit
    • B60T8/405—Control of the pump unit involving the start-up phase
    • 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

Abstract

The system has a return pump for pumping hydraulic fluid toward a master brake cylinder, and an electronic control for activating the return pump. The electronic control is designed such that the return pump is automatically switched on by the electronic control when brake pressure exceeds a predetermined threshold value (12). The electronic control activates the return pump based on parameters such as brake pressure gradients, electrical system voltage, temperature of a brake system or variable trigger threshold. An independent claim is also included for a method for operating a return pump of a hydraulic brake system.

Description

Stand der TechnikState of the art

Die Erfindung betrifft ein hydraulisches Bremssystem gemäß dem Oberbegriff des Patentanspruchs 1 und ein Verfahren zum Betreiben einer Rückförderpumpe gemäß Anspruch 6.The The invention relates to a hydraulic brake system according to the preamble of claim 1 and a method of operating a return pump according to claim 6th

Moderne Bremssysteme, die für eine Fahrdynamikregelung ausgelegt sind, umfassen üblicherweise eine Rückförderpumpe, mittels derer das Hydraulikfluid bei einer ABS-Regelung von den Bremsen zurück Richtung Hauptbremszylinder gefördert wird. Diese Rückförderpumpe wird bei einer Bremsung durch den vom Fahrer erzeugten Bremsdruck (Vordruck) stark belastet. Die genaueren Zusammenhänge werden im Folgenden anhand von 1 näher erläutert.Modern brake systems, which are designed for vehicle dynamics control, usually include a return pump, by means of which the hydraulic fluid is conveyed in an ABS control of the brakes back towards the master cylinder. This return pump is heavily loaded during braking by the brake pressure generated by the driver (form). The more detailed connections are described below on the basis of 1 explained in more detail.

1 zeigt ein aus dem Stand der Technik bekanntes hydraulisches Bremssystem 17, das zur Durchführung einer Fahrdynamikregelung ausgelegt ist. Das Bremssystem 17 umfasst zwei Bremskreise 19a, 19b in X- oder II-Aufteilung, die symmetrisch ausgebildet sind. Im Folgenden wird daher nur auf den in der Figur links dargestellten Teil 19a Bezug genommen. 1 shows a known from the prior art hydraulic brake system 17 , which is designed to carry out a vehicle dynamics control. The brake system 17 includes two brake circuits 19a . 19b in X or II division, which are symmetrical. The following is therefore only on the left part shown in the figure 19a Referenced.

Das Bremssystem umfasst ein Fuß-Bremspedal 1 und einen Bremskraftverstärker 2 mit einem daran angeschlossenen Hauptbremszylinder 4, auf dem ein Bremsflüssigkeitsbehälter 3 angeordnet ist. Bei einer Betätigung des Fuß-Bremspedals 1 wird in den Hauptbremsleitungen 5a, 5b ein entsprechender Bremsdruck erzeugt, der über ein Umschaltventil USV 8 (normally open) und die beiden Einlassventile EV 10a, 10b auf die Bremsbacken 11 der Räder wirkt. Der Pfad, in dem sich bei Betätigung des Fuß-Bremspedals 1 Druck aufbaut, ist durch Pfeile a gekennzeichnet. Das Umschaltventil 8 ist in diesem Zustand geöffnet und ein Hockdruckschaltventil HSV 7 geschlossen (wie gezeigt).The brake system includes a foot brake pedal 1 and a brake booster 2 with a master cylinder connected to it 4 on which a brake fluid reservoir 3 is arranged. Upon actuation of the foot brake pedal 1 gets in the main brake lines 5a . 5b generates a corresponding brake pressure, which via a switching valve UPS 8th (normally open) and the two inlet valves EV 10a . 10b on the brake shoes 11 the wheels works. The path in which when pressing the foot brake pedal 1 Pressure builds up is indicated by arrows a. The changeover valve 8th is open in this state and a high pressure switching valve HSV 7 closed (as shown).

Bei einer ABS-Regelung wird der an den Rädern wirkende Bremsdruck mittels der Einlass- 10a, 10b und der Auslass-Ventile 13a, 13b moduliert, wobei Hydraulikfluid in einem Zwischenspeicher 14 gepuffert werden kann. Eine Pumpvorrichtung, die so genannte Rückförderpumpe 9, fördert die von den Bremsen 11 bzw. dem Zwischenspeicher 14 kommende Bremsflüssigkeit (Hydraulikfluid) entlang des Pfades b zurück in Richtung des Hauptbremszylinders 4.In the case of an ABS control, the brake pressure acting on the wheels is determined by means of the intake 10a . 10b and the outlet valves 13a . 13b modulated, wherein hydraulic fluid in a buffer 14 can be buffered. A pumping device, the so-called return pump 9 that promotes the brakes 11 or the cache 14 coming brake fluid (hydraulic fluid) along the path b back towards the master cylinder 4 ,

Unter Normalbedingungen liegt der Bremsdruck, bei dem die Räder blockieren und das ABS einschaltet, üblicherweise zwischen 70 bar und 100 bar. Bei Fading kann sich dieser Blockier-Bremsdruck jedoch auf 200 bar und mehr erhöhen. Als Fading bezeichnet man das Nachlassen der Bremswirkung insbesondere wegen Überhitzung (Verglasen der Bremsbeläge). Wird die ABS-Regelung unter solchen Bedingungen erst sehr spät aktiv, muss die Rückförderpumpe 9 gegen einen hohen Gegendruck anlaufen. Wenn die Rückförderpumpe zu klein ausgelegt ist, besteht die Gefahr, dass sie nicht anläuft. Um dies zu verhindern, muss die Pumpe für worstcase-Bedingungen (Fading) ausgelegt sein. Eine solche Pumpe ist allerdings relativ groß, schwer und teuer.Under normal conditions, the brake pressure, at which the wheels lock and the ABS turns on, is usually between 70 and 100 bar. When fading, however, this blocking brake pressure can increase to 200 bar and more. Fading refers to the release of the braking effect, in particular due to overheating (vitrification of the brake pads). If ABS control does not become active until very late under such conditions, the return pump must be activated 9 start against a high back pressure. If the return pump is designed too small, there is a risk that it will not start. To prevent this, the pump must be designed for worst case conditions (fading). However, such a pump is relatively large, heavy and expensive.

Offenbarung der ErfindungDisclosure of the invention

Aufgabe der vorliegenden Erfindung ist es, das Bremssystem in Hinblick auf die Rückförderpumpe zu verbessern.task It is the object of the present invention to provide the brake system with respect to the return pump to improve.

Gelöst wird die Aufgabe durch die im Ansprüchen 1 und 8 angegebenen Merkmale. Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Is solved the task by in the claims 1 and 8 specified characteristics. Further embodiments of the invention are the subject of the dependent claims.

Gemäß der Erfindung wird vorgeschlagen, die Pumpvorrichtung automatisch einzuschalten, wenn ein Bremsdruck einen vorgegebenen Schwellenwert überschreitet, wobei der Schwellenwert kleiner ist als der Blockier-Bremsdruck, der bei ungünstigen Bedingungen, wie z. B: Fading, im Bremssystem auftreten kann (im Folgenden „Fading-Blockierdruck”). Bei schlechtem Zustand der Bremsen läuft die Pumpe daher schon an, noch bevor die Räder blockieren bzw. das ABS einsetzt. Das frühe Einschalten der Pumpe hat den Vorteil, dass sie kleiner, leichter und damit auch billiger ausgelegt werden kann. Dies ist darin begründet, dass das Laufmoment der Pumpe, als mittleres Moment über eine Umdrehung, grundsätzlich geringer ist als das Anlaufmoment.According to the invention It is proposed to turn on the pumping device automatically when a brake pressure exceeds a predetermined threshold, wherein the threshold less than the blocking brake pressure, which is unfavorable Conditions, such as B: Fading, can occur in the brake system (im Following "fading blocking pressure"). at bad condition of the brakes is running Therefore pump on, even before the wheels block or the ABS starts. The early one Turning on the pump has the advantage of being smaller, lighter and thus can be interpreted cheaper. This is due to the fact that the running torque of the pump, as an average torque over a revolution, basically lower is as the starting torque.

Der Bremsdruck wird vorzugsweise direkt am Ausgang der Pumpvorrichtung gemessen, kann aber auch in anderen Bereichen, wie z. B. am Ausgang des Hauptbremszylinders oder zwischen dem Einlassventil und den Bremsen bestimmt werden. Gemäß einer bevorzugten Ausführungsform der Erfindung wird der Vordrucksensor zur Druckmessung genutzt, der ohnehin bereits im Fahrzeug verbaut ist.Of the Brake pressure is preferably directly at the outlet of the pumping device measured, but can also be used in other areas, such. B. at the exit the master cylinder or between the inlet valve and the Brakes are determined. According to one preferred embodiment the invention, the form pressure sensor is used for pressure measurement, which is already installed in the vehicle anyway.

Die erfindungsgemäße Steuerung ist vorzugsweise als Softwarealgorithmus realisiert, der z. B. in einen bestehenden Fahrdynamikregler (ESP) integriert werden kann.The Control according to the invention is preferably implemented as a software algorithm, the z. In an existing driving dynamics controller (ESP) can be integrated.

Der Schwellenwert für das Einschalten der Rückförderpumpe liegt vorzugsweise unterhalb des Fading-Blockierdrucks, aber oberhalb des Blockier-Bremsdrucks eines fadingfreien Systems. Er kann z. B. wenigstens 10%, vorzugsweise wenigstens 30% oberhalb des Blockier-Bremsdrucks eines fadingfreien Systems gewählt werden. Dadurch wird erreicht, dass die Pumpvorrichtung im normalen Fahrbetrieb des Kfz (ohne Einsatz des ABS) nicht aktiviert wird.The threshold for switching on the return pump is preferably below the fading-blocking pressure, but above the blocking brake pressure of a fading-free system. He can z. B. at least 10%, preferably at least 30% above the blocking brake pressure of a fa ding-free system can be selected. This ensures that the pump device is not activated during normal driving of the vehicle (without the use of the ABS).

Wenn die Rückförderpumpe eingeschaltet wird, noch bevor das ABS aktiv ist, wird das Hydraulikfluid vorzugsweise in einem Kreislauf gepumpt.If the return pump is turned on, even before the ABS is active, the hydraulic fluid preferably pumped in a cycle.

Die elektronische Steuerung kann neben dem Bremsdruck einen oder mehrere der folgenden Parameter für die Einschaltbedingung berücksichtigen:

  • a) den Bremsdruckgradienten (z. B. am Hauptbremszylinder),
  • b) die Bordnetzspannung,
  • c) die Temperatur des Bremssystems und/oder
  • d) eine applizierbare Triggerschwelle.
In addition to the brake pressure, the electronic control can take into account one or more of the following parameters for the switch-on condition:
  • a) the brake pressure gradient (eg on the master brake cylinder),
  • b) the vehicle electrical system voltage,
  • c) the temperature of the brake system and / or
  • d) an applicable trigger threshold.

Der Bremsdruckgradient am Hauptbremszylinder bezeichnet die Geschwindigkeit des Druckanstiegs am Hauptbremszylinder. Ein steiler Anstieg des Bremsdruckgradienten ist ein Hinweis darauf, dass kurze Zeit später ein Aktivieren des ABS nötig werden könnte.Of the Brake pressure gradient on the master cylinder indicates the speed the pressure increase at the master cylinder. A steep rise in the Brake pressure gradient is an indication that a short time later Activation of the ABS will be necessary could.

Die vorliegende Bordnetzspannung bestimmt das maximal mögliche Drehmoment des Pumpenantriebsmotors, so dass bei einer kleineren Spannung die Pumpvorrichtung bereits früher aktiviert werden muss. In diesem Fall wird der Aktivierungszeitpunkt zu geringeren Bremsdrücken verschoben.The present vehicle electrical system voltage determines the maximum possible torque the pump drive motor, so that at a lower voltage the Pumping device earlier must be activated. In this case, the activation time becomes to lower brake pressures postponed.

Die Temperatur des Bremssystems hat Einfluss auf viele Eigenschaften des Systems, wie z. B. das Anlaufverhalten der Rückförderpumpe, die Viskosität der Bremsflüssigkeit oder die Bremswirkung der Bremsen. Durch Berücksichtigung der Temperatur kann somit die Aktivierungsschwelle der Pumpe an die gegebenen Bedingungen angepasst werden.The Temperature of the brake system affects many properties of the system, such as As the startup behavior of the return pump, the viscosity of the brake fluid or the braking effect of the brakes. By considering the temperature can thus the activation threshold of the pump to the given conditions be adjusted.

Eine variable Triggerschwelle ist vorteilhaft, wenn ein Fahrzeugregler (wie z. B. ABS oder ESP) vorgesehen ist, der vom Fahrer nach Wunsch eingestellt werden kann und der Fahrer z. B. zwischen einer konservativen oder sportlicheren Fahrweise wählen kann. In diesem Fall sind für die Aktivierung der Rückförderpumpe vorzugsweise ebenfalls unterschiedliche Schwellenwerte vorgesehen.A variable trigger threshold is advantageous when a vehicle controller (such as ABS or ESP) provided by the driver as desired can be adjusted and the driver z. B. between a conservative or choose a sportier style of driving can. In this case are for the activation of the return pump preferably also provided different thresholds.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist die Aktivierungsschwelle jedoch ein fester Druckwert. Da der Bremsdruck der wesentlichste Einflussfaktor ist, führt bereits diese einfache Steuerung zu guten Ergebnissen.According to one preferred embodiment of Invention, however, the activation threshold is a fixed pressure value. Since the brake pressure is the most important factor, already leads this simple control to good results.

Kurze Beschreibung der FigurenBrief description of the figures

Die Erfindung wird nachstehend anhand der beigefügten Figuren beispielhaft näher erläutert. Es zeigen:The The invention will be explained in more detail below with reference to the accompanying figures. Show it:

1 ein aus dem Stand der Technik bekanntes hydraulisches Bremssystem, das für eine Fahrdynamikregelung ausgelegt ist und das vom schematischen Aufbau dem erfindungsgemäßem Bremssystem entspricht; und 1 a known from the prior art hydraulic brake system, which is designed for a vehicle dynamics control and which corresponds to the schematic structure of the inventive brake system; and

2 die Motorkennlinien einer bekannten und einer erfindungsgemäßen Rückförderpumpe mit entsprechender Steuerung. 2 the engine characteristics of a known and a return pump according to the invention with appropriate control.

Bezüglich der Erläuterung der 1 wird auf die Beschreibungseinleitung verwiesen.Regarding the explanation of 1 Reference is made to the introduction to the description.

Neben einem Hauptbremszylinder 4 können auch mehrere Hauptbremszylinder verwendet werden. Die Pumpvorrichtung 9 ist vorzugsweise eine Hubkolbenpumpe, insbesondere mit mehreren, wie z. B. zwei oder drei Kolben.In addition to a master cylinder 4 You can also use several master cylinders. The pumping device 9 is preferably a reciprocating pump, in particular with several, such. B. two or three pistons.

2 zeigt eine Motorkennlinie 10 des elektrischen Motors einer Rückförderpumpe 9 in einem konventionellen Bremssystem, sowie eine Motorkennlinie 20 einer erfindungsgemäßen Rückförderpumpe 9. In 2 ist die Motordrehzahl n über dem Motordrehmoment T dargestellt, wobei das Motordrehmoment T proportional zum hydraulischen Druck ist. Wie zu erkennen ist, sinkt die Motordrehzahl n mit steigendem Drehmoment T bzw. Druck etwa linear. 2 shows a motor characteristic 10 the electric motor of a return pump 9 in a conventional braking system, as well as a motor characteristic 20 a return pump according to the invention 9 , In 2 the engine speed n is shown above the engine torque T, where the engine torque T is proportional to the hydraulic pressure. As can be seen, the engine speed n decreases approximately linearly with increasing torque T or pressure.

Wenn der vom Fahrer ausgeübte Bremsdruck über eine bestimmte Schwelle 12 steigt, ist der Gegendruck auf die Pumpe 9 so hoch, dass deren Drehmoment nicht mehr ausreicht, um anzulaufen. Die Linie 12 trennt hier schematisch einen für den Motoranlauf unkritischen Druckbereich (links der Linie 12) von einem kritischen Bereich (rechts der Linie 12).When the brake pressure applied by the driver exceeds a certain threshold 12 increases, is the back pressure on the pump 9 so high that their torque is no longer sufficient to start. The line 12 here separates schematically a non-critical pressure range for engine start-up (left of the line 12 ) from a critical area (to the right of the line 12 ).

Bei bestimmen Zuständen der Bremsen, wie z. B. bei Überhitzung, kann Fading auftreten. Wegen der schlechteren Reibverhältnisse kann der Fading-Blockierdruck, bei dem die Räder blockieren, auf Werte von über 200 bar steigen. Die Pumpe 9 eines herkömmlichen Bremssystems ist daher auf entsprechend hohe Drücke ausgelegt (siehe Kennlinie 10).At certain states of the brakes, such as. B. overheating, fading may occur. Due to the poorer friction conditions, the fade-blocking pressure at which the wheels lock can rise to values above 200 bar. The pump 9 a conventional brake system is therefore designed for correspondingly high pressures (see characteristic curve 10 ).

Im Vergleich dazu kann die Pumpe 9 gemäß der Erfindung (Kennlinie 20) für wesentlich geringere Maximal-Drücke ausgelegt werden, da sie bereits vor Erreichen des Fading-Blockierdrucks aktiviert wird. Sie kann somit kleiner, leichter und kostengünstiger ausgelegt werden.In comparison, the pump can 9 according to the invention (characteristic 20 ) are designed for much lower maximum pressures, since it is activated before reaching the fading blocking pressure. It can thus be designed smaller, lighter and cheaper.

Die Linie 22 trennt wiederum einen unkritischen Druckbereich (links der Linie 22) von einem kritischen Bereich (rechts der Linie 22), in dem die Pumpe 9 möglicherweise nicht mehr anläuft. Die Schwelle, bei der die Rückförderpumpe 9 automatisch eingeschaltet wird, ist nun so gesetzt, dass sie kleiner oder gleich dem kritischen Druck 22 bzw. dem entsprechenden Drehmoment T ist. Damit wird sichergestellt, dass die Pumpe 9 in jedem Fall anläuft. Der Schwellenwert ist aber vorzugsweise größer als der Blockier-Bremsdruck eines fadingfreien Systems (unter Normalbedingungen). Dadurch wird verhindert, dass die Rückförderpumpe unter Normalbedingungen einschaltet, noch bevor das ABS aktiv geworden ist.The line 22 again separates an uncritical pressure area (left of the line 22 ) from a critical area (to the right of the line 22 ), in which the pump 9 may stop working. The threshold at which the return pump 9 is automatically turned on, is now set to be less than or equal to the critical pressure 22 or the corresponding torque T is. This will ensure that the pump 9 in any case starts. However, the threshold is preferably greater than the stall brake pressure of a fade-free system (under normal conditions). This prevents the return pump from switching on under normal conditions, even before the ABS has become active.

2 zeigt ferner das maximale mittlere Drehmoment T während einer Umdrehung der Pumpe 9, das durch eine Linie 24 angedeutet ist. Die Rückförderpumpe 9 ist im Grunde nur noch so auszulegen, dass das maximale mittlere Drehmoment T (Linie 24) größer ist als der im Bremssystem vorherrschende mittlere Bremsdruck bei einer Bremsung. In diesem Fall läuft die Pumpe 9 im Dauerbetrieb und bleibt nicht stehen. 2 also shows the maximum mean torque T during one revolution of the pump 9 that through a line 24 is indicated. The return pump 9 is basically only to be interpreted that the maximum mean torque T (line 24 ) is greater than the prevailing brake pressure in the brake system during braking. In this case, the pump is running 9 in continuous operation and does not stop.

Claims (8)

Hydraulisches Bremssystem mit einem Hauptbremszylinder (4) und einer Pumpvorrichtung (9), mittels derer ein Hydraulikfluid in Richtung des Hauptbremszylinders (4) gepumpt werden kann, sowie mit einer elektronischen Steuerung zum Aktivieren der Pumpvorrichtung (9), dadurch gekennzeichnet, dass die elektronische Steuerung so eingerichtet ist, dass sie die Pumpvorrichtung (9) automatisch einschaltet, wenn ein Bremsdruck einen vorgegebenen Schwellenwert überschreitet.Hydraulic brake system with a master cylinder ( 4 ) and a pumping device ( 9 ), by means of which a hydraulic fluid in the direction of the master cylinder ( 4 ) can be pumped, as well as with an electronic control for activating the pumping device ( 9 ), characterized in that the electronic controller is adapted to operate the pumping device ( 9 ) automatically turns on when a brake pressure exceeds a predetermined threshold. Hydraulisches Bremssystem gemäß Anspruch 1 dadurch gekennzeichnet, dass der Schwellenwert kleiner ist als ein Fading-Blockierdruck.Hydraulic brake system according to claim 1, characterized that the threshold is less than a fading blocking pressure. Hydraulisches Bremssystem gemäß einem der vorangegangenen Ansprüche dadurch gekennzeichnet, dass die elektronische Steuerung so eingerichtet ist, dass sie die Pumpvorrichtung (9) unter Fading-Bedingungen aktiviert, wenn noch kein Rad blockiert.Hydraulic brake system according to one of the preceding claims, characterized in that the electronic control is set up in such a way that it controls the pump device ( 9 ) is activated under fading conditions if no wheel is blocked yet. Hydraulisches Bremssystem gemäß einem der vorangegangenen Ansprüche dadurch gekennzeichnet, dass die elektronische Steuerung die Pumpvorrichtung (9) bei Vorliegen einer Bedingung aktiviert, die neben dem Bremsdruck einen oder mehrere der folgenden Parameter berücksichtigt: a) einen Bremsdruckgradienten, b) die Bordnetzspannung, c) die Temperatur des Bremssystems oder d) eine variable Triggerschwelle.Hydraulic brake system according to one of the preceding claims, characterized in that the electronic controller controls the pumping device ( 9 ) is activated in the presence of a condition which takes into account one or more of the following parameters in addition to the brake pressure: a) a brake pressure gradient, b) the vehicle electrical system voltage, c) the temperature of the brake system or d) a variable trigger threshold. Hydraulisches Bremssystem gemäß einem der vorangegangenen Ansprüche dadurch gekennzeichnet, dass der Schwellenwert ein fest vorgegebener Druckwert ist.Hydraulic brake system according to one of the preceding claims characterized in that the threshold value is a fixed one Pressure value is. Verfahren zum Betreiben einer Pumpvorrichtung (9) eines hydraulischen Bremssystems, dadurch gekennzeichnet, dass die Pumpvorrichtung (9) automatisch eingeschaltet wird, wenn ein Bremsdruck einen vorgegebenen Schwellenwert überschreitet.Method for operating a pump device ( 9 ) of a hydraulic braking system, characterized in that the pumping device ( 9 ) is automatically turned on when a brake pressure exceeds a predetermined threshold. Verfahren gemäß Anspruch 6, wobei der Schwellenwert ein Druckwert ist, der mit dem aktuell gemessenen Bremsdruck verglichen wird.Method according to claim 6, wherein the threshold value is a pressure value, which is equal to the currently measured Brake pressure is compared. Verfahren gemäß Anspruch 7, wobei der Schwellenwert anhand eines Algorithmus ermittelt wird, der neben dem Bremsdruck wenigstens eine weitere Größe berücksichtigt.Method according to claim 7, wherein the threshold is determined by an algorithm, which takes into account at least one additional variable in addition to the brake pressure.
DE200910000577 2009-02-03 2009-02-03 Hydraulic brake system for e.g. anti-lock braking system regulation, has electronic control designed such that return pump is automatically switched on by electronic control when brake pressure exceeds predetermined threshold value Granted DE102009000577A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200910000577 DE102009000577A1 (en) 2009-02-03 2009-02-03 Hydraulic brake system for e.g. anti-lock braking system regulation, has electronic control designed such that return pump is automatically switched on by electronic control when brake pressure exceeds predetermined threshold value
CN201010113356.8A CN101797918B (en) 2009-02-03 2010-02-03 There is the motor vehicle braking systems of the starting performance of scavenging pump of improvement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910000577 DE102009000577A1 (en) 2009-02-03 2009-02-03 Hydraulic brake system for e.g. anti-lock braking system regulation, has electronic control designed such that return pump is automatically switched on by electronic control when brake pressure exceeds predetermined threshold value

Publications (1)

Publication Number Publication Date
DE102009000577A1 true DE102009000577A1 (en) 2010-08-05

Family

ID=42308751

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200910000577 Granted DE102009000577A1 (en) 2009-02-03 2009-02-03 Hydraulic brake system for e.g. anti-lock braking system regulation, has electronic control designed such that return pump is automatically switched on by electronic control when brake pressure exceeds predetermined threshold value

Country Status (2)

Country Link
CN (1) CN101797918B (en)
DE (1) DE102009000577A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013083310A1 (en) * 2011-12-05 2013-06-13 Robert Bosch Gmbh Method for operating a vehicle braking system equipped with a plunger device, and a control device for a vehicle braking system equipped with a plunger device
WO2014082882A2 (en) * 2012-11-30 2014-06-05 Robert Bosch Gmbh Method for carrying out a braking procedure in a vehicle
WO2015113910A1 (en) * 2014-01-29 2015-08-06 Continental Teves Ag & Co. Ohg Electrohydraulic brake pressure control unit
WO2016134796A1 (en) 2015-02-27 2016-09-01 Engineering Center Steyr Gmbh & Co Kg Cooling and/or lubricating circuit for a gearing assembly
WO2017109054A1 (en) * 2015-12-24 2017-06-29 Foundation Brakes France Vehicle brake comprising a measurement of a braking effort, and control methods
DE102016207751A1 (en) * 2016-05-04 2017-11-09 Bayerische Motoren Werke Aktiengesellschaft Method and control unit for controlling a brake system of a vehicle

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1447361A (en) * 1972-09-18 1976-08-25 Mullard Ltd Fluid pressure control devices particularly for antilock vehicle brake systems
US5988774A (en) * 1995-09-29 1999-11-23 Robert Bosch Gmbh Hydraulic brake system with anti-lock arrangement for a vehicle
JP2002104173A (en) * 2000-09-27 2002-04-10 Aisin Seiki Co Ltd Hydraulic braking device for vehicle
KR20060132379A (en) * 2005-06-18 2006-12-21 주식회사 만도 Anti-lock brake system
DE102005056210A1 (en) * 2005-11-25 2007-05-31 Robert Bosch Gmbh Electrical current cycle control for electromagnetic actuator to provide safe closing of hydraulic valve in automobile braking system
KR100721060B1 (en) * 2005-12-07 2007-05-22 주식회사 만도 Brake system of vehicles and its braking method
DE102007016948B3 (en) * 2007-04-05 2008-08-28 Fte Automotive Gmbh Anti-lock hydraulic braking system, particularly for two wheeler rider, has wheel braking circuit with main braking cylinder, wheel braking cylinder and shifting valve

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013083310A1 (en) * 2011-12-05 2013-06-13 Robert Bosch Gmbh Method for operating a vehicle braking system equipped with a plunger device, and a control device for a vehicle braking system equipped with a plunger device
US9139185B2 (en) 2011-12-05 2015-09-22 Robert Bosch Gmbh Method for operating a braking system of a vehicle which is equipped with a plunger device and a control unit for a braking system of a vehicle which is equipped with a plunger device
WO2014082882A2 (en) * 2012-11-30 2014-06-05 Robert Bosch Gmbh Method for carrying out a braking procedure in a vehicle
WO2014082882A3 (en) * 2012-11-30 2014-08-28 Robert Bosch Gmbh Method for carrying out a braking procedure in a vehicle
US9604615B2 (en) 2012-11-30 2017-03-28 Robert Bosch Gmbh Method for carrying out a braking procedure in a vehicle
WO2015113910A1 (en) * 2014-01-29 2015-08-06 Continental Teves Ag & Co. Ohg Electrohydraulic brake pressure control unit
WO2016134796A1 (en) 2015-02-27 2016-09-01 Engineering Center Steyr Gmbh & Co Kg Cooling and/or lubricating circuit for a gearing assembly
WO2017109054A1 (en) * 2015-12-24 2017-06-29 Foundation Brakes France Vehicle brake comprising a measurement of a braking effort, and control methods
FR3046123A1 (en) * 2015-12-24 2017-06-30 Foundation Brakes France VEHICLE BRAKE COMPRISING A MEASUREMENT OF BRAKING EFFORT, AND CONTROL METHODS
DE102016207751A1 (en) * 2016-05-04 2017-11-09 Bayerische Motoren Werke Aktiengesellschaft Method and control unit for controlling a brake system of a vehicle

Also Published As

Publication number Publication date
CN101797918B (en) 2015-09-02
CN101797918A (en) 2010-08-11

Similar Documents

Publication Publication Date Title
EP1708912B1 (en) Method for operating the brake gear of a vehicle
EP1799522B1 (en) Method for prefilling a low-pressure reservoir on a motor vehicle braking system
DE102009000577A1 (en) Hydraulic brake system for e.g. anti-lock braking system regulation, has electronic control designed such that return pump is automatically switched on by electronic control when brake pressure exceeds predetermined threshold value
DE102005029891A1 (en) Condition-dependent pick-up-limit function for automotive brake systems
DE102010063413A1 (en) Method for adjusting the clamping force exerted by a parking brake
DE102010042589A1 (en) Method for automatically braking a vehicle
DE102020202368A1 (en) Method for operating a braking system and braking system
DE102016223845A1 (en) Method and device for operating a brake system, brake system
EP2493733B1 (en) Method for actuating a high pressure control valve in a hydraulic motor vehicle braking system
DE102012200008B3 (en) Method for operating a hydraulic brake system
DE102011006218A1 (en) Brake assembly for motor car, has bi-stable valves provided between main brake cylinder and brake unit in hydraulic lines and controlled by brake control device based on predetermined condition i.e. automatic hold function
EP1931548A1 (en) Method for operating a braking systems for motor vehicles
DE10336047B4 (en) Method for improving the braking behavior of a motor vehicle in the rain
EP2507102B1 (en) Method for actuating a switching valve in a hydraulic motor vehicle brake system
DE102010022493B4 (en) Brake system with a brake booster and method for using a corresponding brake system
DE19525800C2 (en) Traction control system
DE102016208396A1 (en) Method for checking the braking force in a vehicle
DE10347789B4 (en) Method for bleeding a hydraulic brake system
DE102010039186A1 (en) Braking system e.g. external power braking system, for motor car, has hydraulic actuator device actuating piston of master brake cylinder, and pump pumping hydraulic fluid from wheel brake cylinder to master brake cylinder in operating mode
WO2007036433A1 (en) Vehicle regulation with permanently open high-pressure switching valve
DE102007031750A1 (en) Vehicle brake system operating method, particularly motor cycle integrated brake system, involves designing or activating part of valves in such manner that pump piston of brake circuit is brought in position at upper dead center
DE102006023305A1 (en) motorcycle brake system
DE102015210834B4 (en) Method for controlling a "brake-by-wire" brake system and control device
DE102011114803A1 (en) Method for operating brake assembly e.g. hydraulic made brake assembly of passenger car, involves switching off automatic hold function by actuation of brake pedal over threshold value that is variable determined
DE10137016B4 (en) Procedure for brake pressure regulation

Legal Events

Date Code Title Description
R012 Request for examination validly filed
R016 Response to examination communication
R084 Declaration of willingness to licence
R016 Response to examination communication
R018 Grant decision by examination section/examining division