WO2011069715A1 - Hydraulic vehicle braking system - Google Patents

Hydraulic vehicle braking system Download PDF

Info

Publication number
WO2011069715A1
WO2011069715A1 PCT/EP2010/065301 EP2010065301W WO2011069715A1 WO 2011069715 A1 WO2011069715 A1 WO 2011069715A1 EP 2010065301 W EP2010065301 W EP 2010065301W WO 2011069715 A1 WO2011069715 A1 WO 2011069715A1
Authority
WO
WIPO (PCT)
Prior art keywords
brake
valve
pressure
wheel
hydraulic
Prior art date
Application number
PCT/EP2010/065301
Other languages
German (de)
French (fr)
Inventor
Stefan Strengert
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
Publication of WO2011069715A1 publication Critical patent/WO2011069715A1/en

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
    • 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
    • B60T8/26—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels
    • B60T8/266—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force characterised by producing differential braking between front and rear wheels using valves or actuators with external control means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • 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
    • B60T8/4054—Control of the pump unit involving the delivery pressure control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/44—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems
    • B60T8/445—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition co-operating with a power-assist booster means associated with a master cylinder for controlling the release and reapplication of brake pressure through an interaction with the power assist device, i.e. open systems replenishing the released brake fluid volume into the brake piping
    • 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

  • Hydraulic vehicle brake system The invention relates to a hydraulic vehicle brake system having the features of the preamble of claim 1.
  • Hydraulic vehicle brake systems with slip control and / or electric-hydraulic vehicle brake systems are known, with electrohydraulic vehicle brake systems being external energy vehicle brake systems. They have a master cylinder, to which a hydraulic wheel brake is connected in each brake circuit. In each brake circuit, a hydraulic pump is provided, which is also referred to as slipback pump in slip-controlled vehicle brake systems. Each wheel brake is assigned a brake pressure build-up valve and a brake pressure reduction valve. By the brake pressure build-up valve, the wheel brake with the master cylinder and a pressure side of the hydraulic pump is connected.
  • a wheel brake pressure is lowered, usually the wheel brake through the brake pressure reduction valve with a hydraulic accumulator and, usually by a check valve, connectable to a suction side of the hydraulic pump.
  • a brake slip control is a wheel-specific Radbremstikregelung in the wheel brakes with activated hydraulic pump with the brake pressure build-up valve and the Bremstikabsenkven- valve. This is known per se and should therefore not be explained in detail here.
  • the brake pressure increase valve and the brake pressure reduction valve may be combined into a valve having three switch positions and three ports. It is also possible, a plurality of wheel brakes, such as axle, to a
  • the brake circuits are separable from the master cylinder.
  • the isolation valve is closed in a slip control and the master cylinder thereby separated from the brake circuits.
  • the construction of a brake pressure takes place, as far as it has not already been built up with the master cylinder, with the hydraulic pump.
  • the isolation valves are closed at each braking, the brake pressure build-up is not done with the master cylinder, but with the hydraulic pump, so with external energy.
  • the master cylinder specifies a setpoint for the brake pressure to be set. In a fault of the vehicle brake system, the isolation valves remain open, so that the wheel brakes are connected to the master cylinder and operated with him.
  • the hydraulic vehicle brake system has a muscle-operated master cylinder, to which one or more brake circuits are connected.
  • the master brake cylinder has a brake fluid reservoir, which, for example, as is known, is mounted on the master brake cylinder.
  • At least one brake circuit is connected by an isolation valve to the master cylinder, so that the brake circuit is hydraulically separable from the master cylinder by closing the isolation valve.
  • the brake circuit has at least one hydraulic wheel brake, which is connected via an associated brake pressure build-up valve and the isolation valve to the master cylinder. About the brake pressure build-up valve, the at least one wheel brake is also connected to a pressure side of a hydraulic pump.
  • the hydraulic vehicle brake system has a pressure control valve, by which a brake circuit with the brake fluid reservoir is connectable.
  • the pressure control valve is provided for one of the brake circuits, it may be provided in several or all brake circuits pressure control valves, with which the brake circuits with the brake fluid reservoir can be connected.
  • further brake circuits can also be designed differently, in particular in a known and conventional manner, ie in particular have no pressure control valve.
  • a brake pressure in the brake circuit can be lowered and, in particular in cooperation with the hydraulic pump, regulate a brake pressure, for example, to a desired value which is predetermined with the master brake cylinder or possibly also in another way.
  • the invention in a brake circuit and form another brake circuit in a conventional manner.
  • This has the advantage of a usual dependence of the actuation force on the actuation travel of the master cylinder, ie a familiar pedal feeling.
  • the inventively designed brake circuit for braking with the isolation valve from the master cylinder is separable, so that no reaction to the master cylinder is noticeable.
  • This is particularly advantageous in hybrid or electric vehicles, which are driven by a combustion and an electric motor or driven exclusively by an electric motor used as a generator for braking to generate power.
  • a braking effect of the invention designed according to the brake circuit can be reduced by the amount generated by the electric motor generator operation without it being noticeable to a driver that part of the braking effect is not generated by the vehicle brake system, but by the electric motor in the generator mode.
  • Claim 5 provides that at least one wheel brake of the vehicle brake system comprises a self-boosting device.
  • the wheel brakes of one or more axles preferably have self-reinforcing devices and in particular the wheel brakes of the invention.
  • a self-boosting device on one or more wheel brakes makes it possible to dispense with a vacuum or other, central brake booster common today, the vehicle brake system is independent of a sufficient negative pressure, which is not always sufficiently available in diesel engines and modern gasoline engines, as well as hybrid vehicle rental. In pure electric vehicles, there is no negative pressure for a vacuum brake booster.
  • the inventive method with the features of claim 6 provides for a service brake that the isolation valve is closed and the brake circuit is thereby separated hydraulically from the master cylinder.
  • a brake pressure buildup is done with the hydraulic pump, the brake pressure is controlled by the pressure control valve, which as I said, a control of the brake pressure in this brake circuit is to be understood.
  • Claim 7 therefore provides to monitor the brake pressure buildup with the hydraulic pump in the inventively designed brake circuit. For example, the pressure gradient, i. the rate of pressure rise during service braking where the pressure builds up with the hydraulic pump. If the pressure increase compared to a normal value is slowed down, this indicates an error and the vehicle should be taken to a workshop for checking the vehicle brake system.
  • the pressure gradient i. the rate of pressure rise during service braking where the pressure builds up with the hydraulic pump. If the pressure increase compared to a normal value is slowed down, this indicates an error and the vehicle should be taken to a workshop for checking the vehicle brake system.
  • the hydraulic vehicle brake system 1 according to the invention shown in the drawing is a dual-circuit brake system with two brake circuits I, II two brake circuits I, II are connected to a dual-circuit master cylinder 2, which has a brake fluid reservoir 3 mounted on it.
  • the brake master cylinder I is in a known manner, the brake circuit II drawn on the left formed in accordance with the invention, both brake circuits I, II have a slip control on.
  • Both brake circuits I, II are each connected via an isolating valve 5 to the master brake cylinder 2.
  • the isolation valves 5 are in their currentless home position open 2/2-way solenoid valves.
  • Both brake circuits I, II have two hydraulic wheel brakes 6, 7, wherein the number of two wheel brakes 6, 7 per brake circuit I, II is not mandatory for the invention.
  • Each wheel brake 6, 7 is associated with a brake pressure build-up valve 8 and a brake pressure reduction valve 9.
  • the wheel brakes 6, 7 are connected to the isolation valves 5.
  • About the Bremsdruckabsenkventile 9 the wheel brakes 6, 7 are connected to suction sides of hydraulic pumps 10, the pressure sides between the separating valves 5 and the brake pressure build-up valves 8 are connected.
  • each brake circuit I, II There is provided in each brake circuit I, II a hydraulic pump 10 for all wheel brakes 6, 7 of this brake circuit I, II.
  • the hydraulic pumps 10 can be driven by a common electric motor 1 1. Because of the better controllability, the brake pressure build-up valves 8 and the brake pressure reduction valves 9 are proportional valves, the brake pressure build-up valves 8 are open in their currentless normal position, the brake pressure reduction valves 9 are closed in their currentless basic position. With the brake pressure build-up valves 8 and the brake pressure reduction valves 9, a wheel-specific wheel brake pressure control in each wheel brake 6, 7 is possible, for example, for a slip control. Such slip regulations are known per se and will not be explained in detail here.
  • a pressure sensor 12 is connected to measure the wheel brake pressure and can control.
  • a hydraulic accumulator 13 is arranged between the brake pressure reduction valves 9 and the hydraulic pump 10, that is to say on the suction side thereof
  • the suction side of the hydraulic pump 10 is connected by an intake valve 14 to the master cylinder 2, to be able to suck directly to a fast brake pressure build-up brake fluid from the master cylinder 2 can.
  • the intake valve 14 is a closed in its normally closed position 2/2-way solenoid valve.
  • a pressure sensor 15 is connected to the master cylinder 2.
  • the master cylinder 2 has a displacement sensor 16 and a force sensor 17, with which an actuating force and an actuating travel can be measured.
  • the sensors 15, 16, 17 provide redundant setpoint values for a wheel brake pressure to be set in the brake circuit II. Basically, one of the three sensors 15, 16, 17 is sufficient.
  • the inventively designed brake circuit II has no hydraulic accumulator on the suction side of the hydraulic pump 10 and it lacks the intake valve. Instead, the wheel brakes 7 are connected via the Bremstikabsenkventile 9 and the suction side of the hydraulic pump 10 to the pressureless brake fluid reservoir 3.
  • the pressure side of the hydraulic pump 10 of the brake circuit II is connected via a pressure regulating valve 18 to the brake fluid reservoir 3.
  • the pressure control valve 18 is a closed in its normally closed position 2/2-way solenoid valve, because of better controllability, it is a proportional valve.
  • the separating valve 5 of the brake circuit II is closed and the hydraulic pump 10 is switched on, which builds up a brake pressure.
  • a vehicle equipped with the hydraulic vehicle brake system 1 according to the invention has one or more electric drive motors for its drive, as is the case with a hybrid vehicle or an electric vehicle, and the electric drive motor (s) are in braking for the recovery of Power operated as generators, a wheel braking force of the wheel brakes 7 of the brake circuit II is reduced according to a braking effect. which the electric drive motor (s) generate in generator operation. It is imperceptible for a vehicle driver that a braking force of the brake circuit II is reduced in accordance with the braking effect of the electric drive motor (s) during generator operation. A fluctuating braking action of the electric drive motor (s) in generator operation during braking can be compensated without any problems with the vehicle brake system 1 according to the invention and imperceptibly for a vehicle driver.
  • the wheel brakes 7 of the brake circuit II have a hydraulic self-boosting device 19. Such self-boosting devices 19 are known and will not be explained in detail here. There are also other, for example mechanical self-reinforcing devices known and possible.
  • the wheel brakes 6 of the brake circuit I can also have self-boosting devices (not shown).
  • the self-boosting devices 19 of the wheel brakes 7 of the brake circuit II can be omitted in this case, but need not be omitted.
  • the self-energizing devices 19 of the wheel brakes 7 have the advantage that a brake booster on the master cylinder 2 is dispensable. This is particularly advantageous when there is insufficient or no negative pressure available for a vacuum brake booster, as is the case with diesel engines, in part with modern gasoline engines, hybrid vehicles and electric vehicles.
  • a brake pressure gradient ie the speed of the brake pressure build-up with the hydraulic pump 10 with one of the pressure sensors 12 connected to the wheel brakes 7, is measured during each braking operation. If the pressure build-up is slower than usual, this indicates a fault in the brake circuit II and the vehicle is to be brought to a workshop for testing. For example, a brake pressure reduction valve 9 may be leaking, which impairs the function of the brake circuit II; it may even fail completely. In particular, in a fault of the vehicle brake system 1 is for a
  • brake circuit II acts as a source of external energy.
  • the brake pressure is by external energy with the hydraulic pump 10 and not built by muscle power with the master cylinder 2, which is separated by the closed separating valve 5 from the brake circuit II.
  • An auxiliary braking in case of failure takes place with the master cylinder 2, the isolation valve 5 remains open in this case.
  • a regulation of the brake pressure in the brake circuit II is carried out at a service brake as already said with the brake pressure control valve 18, through which the pressure side of the hydraulic pump 10 is connected to the pressureless brake fluid reservoir 3.
  • the pressure control valve 18 With the pressure control valve 18, the pressure on the pressure side of the hydraulic pump 10 and thus the brake pressure in the brake circuit II can be regulated.
  • Bremstikabsenkventilen 9 is basically also possible during or to a service braking, but not intended for a service braking, but for slip control.

Abstract

The invention relates to a hydraulic vehicle braking system (1) having a slip control apparatus having a hydro pump (10). According to the invention, there is a pressure control valve (18) in a braking circuit Il of the vehicle braking system (1) which connects a pressure side of the hydro pump (10) to an unpressurized brake liquid reservoir container (3) which is placed on a main brake cylinder (2). A braking pressure in the braking circuit Il can be controlled by the pressure control valve (18). An equalization of the braking effect of an electrical drive motor of a vehicle, which is equipped with the vehicle braking system (1), which is operated as a generator for creating electrical current for energy recovery during operational braking is thus possible, for example, without being noticeable for the driver of the vehicle.

Description

Beschreibung  description
Titel title
Hydraulische Fahrzeuqbremsanlaqe Die Erfindung betrifft eine hydraulische Fahrzeugbremsanlage mit den Merkmalen des Oberbegriffs des Anspruchs 1.  Hydraulic vehicle brake system The invention relates to a hydraulic vehicle brake system having the features of the preamble of claim 1.
Stand der Technik Hydraulische Fahrzeugbremsanlagen mit einer Schlupfregelung und/oder elekt- rohydraulische Fahrzeugbremsanlagen sind bekannt, wobei elektrohydraulische Fahrzeugbremsanlagen Fremdenergie-Fahrzeugbremsanlagen sind. Sie weisen einen Hauptbremszylinder auf, an den in jedem Bremskreis eine hydraulische Radbremse angeschlossen ist. In jedem Bremskreis ist eine Hydropumpe vorge- sehen, die bei schlupfgeregelten Fahrzeugbremsanlagen auch als Rückförderpumpe bezeichnet wird. Jeder Radbremse ist ein Bremsdruckaufbauventil und ein Bremsdruckabsenkventil zugeordnet. Durch das Bremsdruckaufbauventil ist die Radbremse mit dem Hauptbremszylinder und einer Druckseite der Hydropumpe verbindbar. Durch das Bremsdruckabsenkventil ist ein Radbremsdruck absenkbar, üblicherweise ist die Radbremse durch das Bremsdruckabsenkventil mit einem Hydrospeicher und, meist durch ein Rückschlagventil, mit einer Saugseite der Hydropumpe verbindbar. Zu einer Bremsschlupfregelung erfolgt eine radindividuelle Radbremsdruckregelung in den Radbremsen bei eingeschalteter Hydropumpe mit dem Bremsdruckaufbauventil und dem Bremsdruckabsenkven- til. Dies ist an sich bekannt und soll deswegen hier nicht näher erläutert werden.PRIOR ART Hydraulic vehicle brake systems with slip control and / or electric-hydraulic vehicle brake systems are known, with electrohydraulic vehicle brake systems being external energy vehicle brake systems. They have a master cylinder, to which a hydraulic wheel brake is connected in each brake circuit. In each brake circuit, a hydraulic pump is provided, which is also referred to as slipback pump in slip-controlled vehicle brake systems. Each wheel brake is assigned a brake pressure build-up valve and a brake pressure reduction valve. By the brake pressure build-up valve, the wheel brake with the master cylinder and a pressure side of the hydraulic pump is connected. By the Bremsdruckabsenkventil a wheel brake pressure is lowered, usually the wheel brake through the brake pressure reduction valve with a hydraulic accumulator and, usually by a check valve, connectable to a suction side of the hydraulic pump. For a brake slip control is a wheel-specific Radbremsdruckregelung in the wheel brakes with activated hydraulic pump with the brake pressure build-up valve and the Bremsdruckabsenkven- valve. This is known per se and should therefore not be explained in detail here.
Mit dem Bremsdruckaufbauventil und dem Bremsdruckabsenkventil ist auch eine Radbremsdruckregelung bei einer Betriebsbremsung ohne Schlupfregelung möglich. Das Bremsdruckaufbauventil und das Bremsdruckabsenkventil können zu einem Ventil mit drei Schaltstellungen und drei Anschlüssen kombiniert sein. Es ist auch möglich, mehrere Radbremsen, beispielsweise achsweise, an einWith the brake pressure build-up valve and the brake pressure reduction valve is also a Radbremsdruckregelung in a service braking without slip control possible. The brake pressure increase valve and the brake pressure reduction valve may be combined into a valve having three switch positions and three ports. It is also possible, a plurality of wheel brakes, such as axle, to a
Bremsdruckaufbauventil und ein Bremsdruckabsenkventil anzuschließen und den Radbremsdruck gemeinsam zu regeln; eine radindividuelle Radbremsdruckregelung ist in diesem Fall nicht möglich. Unter Regelung ist hier auch eine Steuerung zu verstehen. Connect brake pressure build-up valve and a brake pressure reduction valve and to regulate the wheel brake pressure together; a wheel-specific Radbremsdruckregelung is not possible in this case. Under control here is also a control to understand.
Mit Trennventilen sind die Bremskreise vom Hauptbremszylinder trennbar. Üblicherweise wird das Trennventil bei einer Schlupfregelung geschlossen und der Hauptbremszylinder dadurch von den Bremskreisen getrennt. Der Aufbau eines Bremsdrucks erfolgt, soweit er nicht schon mit dem Hauptbremszylinder aufgebaut worden ist, mit der Hydropumpe. Bei einer elektrohydraulischen Fahrzeugbremsanlage werden die Trennventile bei jeder Bremsung geschlossen, der Bremsdruckaufbau erfolgt nicht mit dem Hauptbremszylinder, sondern mit der Hydropumpe, also mit Fremdenergie. Der Hauptbremszylinder gibt einen Sollwert für den einzustellenden Bremsdruck vor. Bei einer Störung der Fahrzeugbremsanlage bleiben die Trennventile offen, so dass die Radbremsen mit dem Hauptbremszylinder verbunden sind und mit ihm betätigt werden. With separating valves, the brake circuits are separable from the master cylinder. Usually, the isolation valve is closed in a slip control and the master cylinder thereby separated from the brake circuits. The construction of a brake pressure takes place, as far as it has not already been built up with the master cylinder, with the hydraulic pump. In an electrohydraulic vehicle brake system, the isolation valves are closed at each braking, the brake pressure build-up is not done with the master cylinder, but with the hydraulic pump, so with external energy. The master cylinder specifies a setpoint for the brake pressure to be set. In a fault of the vehicle brake system, the isolation valves remain open, so that the wheel brakes are connected to the master cylinder and operated with him.
Offenbarung der Erfindung Disclosure of the invention
Die erfindungsgemäße hydraulische Fahrzeugbremsanlage mit den Merkmalen des Anspruchs 1 weist einen muskelkraftbetätigbaren Hauptbremszylinder auf, an den ein oder mehrere Bremskreise angeschlossen sind. Der Hauptbremszylinder weist einen Bremsflüssigkeitsvorratsbehälter auf, der beispielsweise, wie bekannt, auf den Hauptbremszylinder aufgesetzt ist. Mindestens ein Bremskreis ist durch ein Trennventil mit dem Hauptbremszylinder verbunden, so dass der Bremskreis durch Schließen des Trennventils hydraulisch vom Hauptbremszylinder trennbar ist. Der Bremskreis weist mindestens eine hydraulische Radbremse auf, die über ein ihr zugeordnetes Bremsdruckaufbauventil und das Trennventil an den Hauptbremszylinder angeschlossen ist. Über das Bremsdruckaufbauventil ist die mindestens eine Radbremse auch an eine Druckseite einer Hydropumpe angeschlossen. Zum Absenken eines Radbremsdrucks und damit zur Verringerung einer Radbremskraft ist der mindestens einen Radbremse ein Bremsdruckabsenkventil zugeordnet, wobei das Bremsdruckaufbauventil und das Bremsdruckabsenkventil auch zu einem gemeinsamen Ventil zusammengefasst sein können. Außerdem weist die erfindungsgemäße hydraulische Fahrzeugbremsanlage ein Druckregelventil auf, durch das der eine Bremskreis mit dem Bremsflüssigkeitsvorratsbehälter verbindbar ist. Das Druckregelventil ist für einen der Bremskreise vorgesehen, es können auch in mehreren bzw. allen Bremskreisen Druckregelventile vorgesehen sein, mit denen die Bremskreise mit dem Bremsflüssigkeitsvorratsbehälter verbindbar sind. Allerdings können weitere Bremskreise auch anders, insbesondere in bekannter und herkömmlicher Weise ausgebildet sein, also insbesondere kein Druckregelventil aufweisen. Mit dem Druckregelventil lässt sich ein Bremsdruck in dem Bremskreis absenken und insbesondere im Zusammenwirken mit der Hydropumpe ein Bremsdruck regeln beispielsweise auf einen Sollwert, der mit dem Hauptbremszylinder oder eventuell auch in anderer Weise vorgegeben wird. The hydraulic vehicle brake system according to the invention with the features of claim 1 has a muscle-operated master cylinder, to which one or more brake circuits are connected. The master brake cylinder has a brake fluid reservoir, which, for example, as is known, is mounted on the master brake cylinder. At least one brake circuit is connected by an isolation valve to the master cylinder, so that the brake circuit is hydraulically separable from the master cylinder by closing the isolation valve. The brake circuit has at least one hydraulic wheel brake, which is connected via an associated brake pressure build-up valve and the isolation valve to the master cylinder. About the brake pressure build-up valve, the at least one wheel brake is also connected to a pressure side of a hydraulic pump. To lower a wheel brake pressure and thus to reduce a wheel braking force of the at least one wheel brake is associated with a brake pressure reduction valve, wherein the brake pressure build-up valve and the brake pressure reduction valve can also be combined to form a common valve. In addition, the hydraulic vehicle brake system according to the invention has a pressure control valve, by which a brake circuit with the brake fluid reservoir is connectable. The pressure control valve is provided for one of the brake circuits, it may be provided in several or all brake circuits pressure control valves, with which the brake circuits with the brake fluid reservoir can be connected. However, further brake circuits can also be designed differently, in particular in a known and conventional manner, ie in particular have no pressure control valve. With the pressure control valve, a brake pressure in the brake circuit can be lowered and, in particular in cooperation with the hydraulic pump, regulate a brake pressure, for example, to a desired value which is predetermined with the master brake cylinder or possibly also in another way.
Es genügt, die Erfindung in einem Bremskreis vorzusehen und einen anderen Bremskreis in herkömmlicher Weise auszubilden. Das hat den Vorteil einer gewohnten Abhängigkeit der Betätigungskraft vom Betätigungsweg des Hauptbremszylinders, also eines gewohnten Pedalgefühls. Trotzdem ist der erfindungsgemäß ausgestaltete Bremskreis zum Bremsen mit dem Trennventil vom Hauptbremszylinder trennbar, so dass keine Rückwirkung am Hauptbremszylinder spürbar ist. Das ist insbesondere von Vorteil bei Hybrid- oder Elektrofahrzeu- gen, die mit einem Verbrennungs- und mit einem Elektromotor bzw. die ausschließlich mit einem Elektromotor angetrieben werden, der zum Bremsen als Generator benutzt wird, um Strom zu erzeugen. Eine Bremswirkung des erfindungsgemäß ausgestalteten Bremskreises lässt sich um den Betrag, den der Elektromotor im Generatorbetrieb erzeugt, verringern ohne dass für einen Fahrzeugführer merkbar ist, dass ein Teil der Bremswirkung nicht mit der Fahrzeugbremsanlage, sondern vom Elektromotor im Generatorbetrieb erzeugt wird. It is sufficient to provide the invention in a brake circuit and form another brake circuit in a conventional manner. This has the advantage of a usual dependence of the actuation force on the actuation travel of the master cylinder, ie a familiar pedal feeling. Nevertheless, the inventively designed brake circuit for braking with the isolation valve from the master cylinder is separable, so that no reaction to the master cylinder is noticeable. This is particularly advantageous in hybrid or electric vehicles, which are driven by a combustion and an electric motor or driven exclusively by an electric motor used as a generator for braking to generate power. A braking effect of the invention designed according to the brake circuit can be reduced by the amount generated by the electric motor generator operation without it being noticeable to a driver that part of the braking effect is not generated by the vehicle brake system, but by the electric motor in the generator mode.
Die Unteransprüche haben vorteilhafte Ausgestaltungen und Weiterbildungen der im Anspruch 1 angegebenen Erfindung zum Gegenstand. The dependent claims have advantageous refinements and developments of the invention specified in claim 1 to the subject.
Anspruch 5 sieht vor, dass mindestens eine Radbremse der Fahrzeugbremsanlage eine Selbstverstärkungseinrichtung aufweist. Hierfür sind hydraulische und mechanische Lösungen bekannt, auf die hier nicht näher eingegangen werden soll. Vorzugsweise weisen die Radbremsen einer oder mehrerer Achsen Selbstverstärkungseinrichtungen auf und insbesondere die Radbremsen des erfin- dungsgemäß ausgestalteten Bremskreises. Eine Selbstverstärkungseinrichtung an einer oder mehreren Radbremsen ermöglicht den Verzicht auf einen heute üblichen Unterdruck- oder sonstigen, zentralen Bremskraftverstärker, die Fahrzeugbremsanlage ist dadurch unabhängig von einem ausreichenden Unterdruck, der bei Dieselmotoren und auch bei modernen Ottomotoren nicht immer ausreichend zur Verfügung steht, ebenso bei Hybrid-Fahrzeugen. Bei reinen Elektro- fahrzeugen entsteht kein Unterdruck für einen Unterdruck-Bremskraftverstärker. Claim 5 provides that at least one wheel brake of the vehicle brake system comprises a self-boosting device. For this purpose, hydraulic and mechanical solutions are known, which will not be discussed here. The wheel brakes of one or more axles preferably have self-reinforcing devices and in particular the wheel brakes of the invention. In accordance with designed brake circuit. A self-boosting device on one or more wheel brakes makes it possible to dispense with a vacuum or other, central brake booster common today, the vehicle brake system is independent of a sufficient negative pressure, which is not always sufficiently available in diesel engines and modern gasoline engines, as well as hybrid vehicle rental. In pure electric vehicles, there is no negative pressure for a vacuum brake booster.
Das erfindungsgemäße Verfahren mit den Merkmalen des Anspruchs 6 sieht zu einer Betriebsbremsung vor, dass das Trennventil geschlossen und der Bremskreis dadurch hydraulisch vom Hauptbremszylinder getrennt wird. Ein Bremsdruckaufbau erfolgt mit der Hydropumpe, der Bremsdruck wird mit dem Druckregelventil geregelt, worunter wie gesagt auch ein Steuern des Bremsdrucks in diesem Bremskreis zu verstehen ist. The inventive method with the features of claim 6 provides for a service brake that the isolation valve is closed and the brake circuit is thereby separated hydraulically from the master cylinder. A brake pressure buildup is done with the hydraulic pump, the brake pressure is controlled by the pressure control valve, which as I said, a control of the brake pressure in this brake circuit is to be understood.
Wegen der Verbindung des Bremskreises mit dem Bremsflüssigkeitsvorratsbehälter kann es beispielsweise bei einer Leckage des Druckregelventils oder eines Druckabsenkventils der Druckaufbau beeinträchtigt oder im schlechtesten Fall kein (nennenswerter) Druckaufbau mehr möglich sein. Anspruch 7 sieht deswegen vor, den Bremsdruckaufbau mit der Hydropumpe in dem erfindungsgemäß ausgebildeten Bremskreis zu überwachen. Überwacht werden kann beispielsweise der Druckgradient, d.h. die Geschwindigkeit des Druckanstiegs bei einer Betriebsbremsung, bei der der Druckaufbau mit der Hydropumpe erfolgt. Ist der Druckanstieg gegenüber einem Normalwert verlangsamt, deutet das auf einen Fehler hin und das Fahrzeug sollte zur Überprüfung der Fahrzeugbremsanlage in eine Werkstatt gebracht werden. Because of the connection of the brake circuit with the brake fluid reservoir, it may for example be affected in a leakage of the pressure control valve or a pressure reduction valve, the pressure build-up or in the worst case no (significant) pressure build-up more possible. Claim 7 therefore provides to monitor the brake pressure buildup with the hydraulic pump in the inventively designed brake circuit. For example, the pressure gradient, i. the rate of pressure rise during service braking where the pressure builds up with the hydraulic pump. If the pressure increase compared to a normal value is slowed down, this indicates an error and the vehicle should be taken to a workshop for checking the vehicle brake system.
Kurze Beschreibung der Zeichnung Die einzige Figur zeigt einen hydraulischen Schaltplan einer erfindungsgemäßenBrief Description of the Drawing The sole figure shows a hydraulic circuit diagram of a device according to the invention
Fahrzeugbremsanlage. Vehicle brake system.
Ausführungsform der Erfindung Die in der Zeichnung dargestellte, erfindungsgemäße hydraulische Fahrzeugbremsanlage 1 ist eine Zweikreis-Bremsanlage mit zwei Bremskreisen I, II. Die beiden Bremskreise I, II sind an einen Zweikreis-Hauptbremszylinder 2 angeschlossen, der einen auf ihn aufgesetzten Bremsflüssigkeitsvorratsbehälter 3 aufweist. Der Hauptbremszylinder 2 ist muskelkraftbetätigbar, im gezeichneten Ausführungsbeispiel mit einem (Fuß-) Bremspedal 4. Der in der Zeichnung rech- te Bremskreis I ist in bekannter Weise, der links gezeichnete Bremskreis II in erfindungsgemäßer Weise ausgebildet, beide Bremskreise I, II weisen eine Schlupfregelung auf. Embodiment of the Invention The hydraulic vehicle brake system 1 according to the invention shown in the drawing is a dual-circuit brake system with two brake circuits I, II two brake circuits I, II are connected to a dual-circuit master cylinder 2, which has a brake fluid reservoir 3 mounted on it. The brake master cylinder I is in a known manner, the brake circuit II drawn on the left formed in accordance with the invention, both brake circuits I, II have a slip control on.
Beide Bremskreise I, II sind über je ein Trennventil 5 mit dem Hauptbremszylin- der 2 verbunden. Die Trennventile 5 sind in ihrer stromlosen Grundstellung offene 2/2 -Wege-Magnetventile. Beide Bremskreise I, II weisen zwei hydraulische Radbremsen 6, 7 auf, wobei die Anzahl von zwei Radbremsen 6, 7 je Bremskreis I, II nicht zwingend für die Erfindung ist. Jeder Radbremse 6, 7 ist ein Bremsdruckaufbauventil 8 und ein Bremsdruckabsenkventil 9 zugeordnet. Über die Bremsdruckaufbauventile 8 sind die Radbremsen 6, 7 an die Trennventile 5 angeschlossen. Über die Bremsdruckabsenkventile 9 sind die Radbremsen 6, 7 an Saugseiten von Hydropumpen 10 angeschlossen, deren Druckseiten zwischen den Trennventilen 5 und den Bremsdruckaufbauventilen 8 angeschlossen sind. Es ist in jedem Bremskreis I, II eine Hydropumpe 10 für alle Radbrem- sen 6, 7 dieses Bremskreises I, II vorgesehen. Die Hydropumpen 10 sind mit einem gemeinsamen Elektromotor 1 1 antreibbar. Wegen der besseren Regelbarkeit sind die Bremsdruckaufbauventile 8 und die Bremsdruckabsenkventile 9 Proportionalventile, die Bremsdruckaufbauventile 8 sind in ihrer stromlosen Grundstellung offen, die Bremsdruckabsenkventile 9 in ihrer stromlosen Grund- Stellung geschlossen. Mit den Bremsdruckaufbauventilen 8 und den Bremsdruckabsenkventilen 9 ist eine radindividuelle Radbremsdruckregelung in jeder Radbremse 6, 7 möglich beispielsweise für eine Schlupfregelung. Solche Schlupfregelungen sind an sich bekannt und sollen hier nicht näher erläutert werden. Both brake circuits I, II are each connected via an isolating valve 5 to the master brake cylinder 2. The isolation valves 5 are in their currentless home position open 2/2-way solenoid valves. Both brake circuits I, II have two hydraulic wheel brakes 6, 7, wherein the number of two wheel brakes 6, 7 per brake circuit I, II is not mandatory for the invention. Each wheel brake 6, 7 is associated with a brake pressure build-up valve 8 and a brake pressure reduction valve 9. About the brake pressure build-up valves 8, the wheel brakes 6, 7 are connected to the isolation valves 5. About the Bremsdruckabsenkventile 9, the wheel brakes 6, 7 are connected to suction sides of hydraulic pumps 10, the pressure sides between the separating valves 5 and the brake pressure build-up valves 8 are connected. There is provided in each brake circuit I, II a hydraulic pump 10 for all wheel brakes 6, 7 of this brake circuit I, II. The hydraulic pumps 10 can be driven by a common electric motor 1 1. Because of the better controllability, the brake pressure build-up valves 8 and the brake pressure reduction valves 9 are proportional valves, the brake pressure build-up valves 8 are open in their currentless normal position, the brake pressure reduction valves 9 are closed in their currentless basic position. With the brake pressure build-up valves 8 and the brake pressure reduction valves 9, a wheel-specific wheel brake pressure control in each wheel brake 6, 7 is possible, for example, for a slip control. Such slip regulations are known per se and will not be explained in detail here.
An jede Radbremse 6, 7 ist ein Drucksensor 12 angeschlossen, um den Radbremsdruck messen und regeln zu können. To each wheel brake 6, 7, a pressure sensor 12 is connected to measure the wheel brake pressure and can control.
Im Bremskreis I ist zwischen den Bremsdruckabsenkventilen 9 und der Hydro- pumpe 10, also auf deren Saugseite, ein Hydrospeicher 13 angeordnet umIn the brake circuit I, a hydraulic accumulator 13 is arranged between the brake pressure reduction valves 9 and the hydraulic pump 10, that is to say on the suction side thereof
Bremsflüssigkeit aus den Radbremsen 6 bei einer Radbremsdruckregelung auf- nehmen und Zwischenspeichern zu können. Außerdem ist die Saugseite der Hydropumpe 10 durch ein Ansaugventil 14 mit dem Hauptbremszylinder 2 verbindbar, um zu einem schnellen Bremsdruckaufbau Bremsflüssigkeit unmittelbar aus dem Hauptbremszylinder 2 ansaugen zu können. Das Ansaugventil 14 ist ein in seiner stromlosen Grundstellung geschlossenes 2/2-Wege-Magnetventil. Brake fluid from the wheel brakes 6 at a Radbremsdruckregelung take and caching. In addition, the suction side of the hydraulic pump 10 is connected by an intake valve 14 to the master cylinder 2, to be able to suck directly to a fast brake pressure build-up brake fluid from the master cylinder 2 can. The intake valve 14 is a closed in its normally closed position 2/2-way solenoid valve.
In einem der beiden Bremskreise I, II ist ein Drucksensor 15 an den Hauptbremszylinder 2 angeschlossen. Außerdem weist der Hauptbremszylinder 2 einen Wegsensor 16 und einen Kraftsensor 17 auf, mit denen eine Betätigungs- kraft und ein Betätigungsweg messbar sind. Die Sensoren 15, 16, 17 liefern redundante Sollwerte für einen im Bremskreis II einzustellenden Radbremsdruck. Grundsätzlich genügt einer der drei Sensoren 15, 16, 17. In one of the two brake circuits I, II, a pressure sensor 15 is connected to the master cylinder 2. In addition, the master cylinder 2 has a displacement sensor 16 and a force sensor 17, with which an actuating force and an actuating travel can be measured. The sensors 15, 16, 17 provide redundant setpoint values for a wheel brake pressure to be set in the brake circuit II. Basically, one of the three sensors 15, 16, 17 is sufficient.
Der erfindungsgemäß ausgeführte Bremskreis II weist keinen Hydrospeicher auf der Saugseite der Hydropumpe 10 auf und es fehlt das Ansaugventil. Statt dessen sind die Radbremsen 7 über die Bremsdruckabsenkventile 9 und die Saugseite der Hydropumpe 10 an den drucklosen Bremsflüssigkeitsvorratsbehälter 3 angeschlossen. Die Druckseite der Hydropumpe 10 des Bremskreises II ist über ein Druckregelventil 18 mit dem Bremsflüssigkeitsvorratsbehälter 3 verbunden. Das Druckregelventil 18 ist ein in seiner stromlosen Grundstellung geschlossenes 2/2-Wege-Magnetventil, wegen der besseren Regelbarkeit ist es ein Proportionalventil. The inventively designed brake circuit II has no hydraulic accumulator on the suction side of the hydraulic pump 10 and it lacks the intake valve. Instead, the wheel brakes 7 are connected via the Bremsdruckabsenkventile 9 and the suction side of the hydraulic pump 10 to the pressureless brake fluid reservoir 3. The pressure side of the hydraulic pump 10 of the brake circuit II is connected via a pressure regulating valve 18 to the brake fluid reservoir 3. The pressure control valve 18 is a closed in its normally closed position 2/2-way solenoid valve, because of better controllability, it is a proportional valve.
Bei einer Betriebsbremsung wird das Trennventil 5 des Bremskreis II geschlos- sen und es wird die Hydropumpe 10 eingeschaltet, die einen Bremsdruck aufbaut. Eine Regelung des Bremsdrucks im Bremskreis II erfolgt mittels des Bremsdruckregelventils 18, wobei die Regelung in Abhängigkeit von den Signalen mindestens eines der an den Hauptbremszylinder 2 angeschlossenen Sensoren 15, 16, 17 geregelt wird. During a service brake, the separating valve 5 of the brake circuit II is closed and the hydraulic pump 10 is switched on, which builds up a brake pressure. A control of the brake pressure in the brake circuit II by means of the brake pressure control valve 18, wherein the control in response to the signals of at least one of the connected to the master cylinder 2 sensors 15, 16, 17 is controlled.
Weist ein Fahrzeug, das mit der erfindungsgemäßen hydraulischen Fahrzeugbremsanlage 1 ausgestattet ist, einen oder mehrere Elektro-Antriebsmotoren zu seinem Antrieb auf, wie es bei einem Hybridfahrzeug oder einem Elektrofahrzeug der Fall ist, und werden der oder die Elektro-Antriebsmotoren beim Bremsen zur Rückgewinnung von Energie als Generatoren betrieben, wird eine Radbremskraft der Radbremsen 7 des Bremskreis II entsprechend einer Bremswirkung verrin- gert, die der oder die Elektro-Antriebsmotor/en im Generatorbetrieb erzeugt/en. Für einen Fahrzeugführer ist unmerklich, dass eine Bremskraft des Bremskreis II entsprechend der Bremswirkung des oder der Elektro-Antriebsmotor/en im Generatorbetrieb verringert ist. Eine schwankende Bremswirkung des bzw. der Elektro-Antriebsmotoren im Generatorbetrieb während einer Bremsung lässt sich mit der erfindungsgemäßen Fahrzeugbremsanlage 1 problemlos und für einen Fahrzeugführer unmerklich ausgleichen. If a vehicle equipped with the hydraulic vehicle brake system 1 according to the invention has one or more electric drive motors for its drive, as is the case with a hybrid vehicle or an electric vehicle, and the electric drive motor (s) are in braking for the recovery of Power operated as generators, a wheel braking force of the wheel brakes 7 of the brake circuit II is reduced according to a braking effect. which the electric drive motor (s) generate in generator operation. It is imperceptible for a vehicle driver that a braking force of the brake circuit II is reduced in accordance with the braking effect of the electric drive motor (s) during generator operation. A fluctuating braking action of the electric drive motor (s) in generator operation during braking can be compensated without any problems with the vehicle brake system 1 according to the invention and imperceptibly for a vehicle driver.
Die Radbremsen 7 des Bremskreis II weisen eine hydraulische Selbstverstärkungseinrichtung 19 auf. Solche Selbstverstärkungseinrichtungen 19 sind bekannt und sollen hier nicht näher erläutert werden. Es sind auch andere, beispielsweise mechanische Selbstverstärkungseinrichtungen bekannt und möglich. Auch können die Radbremsen 6 des Bremskreis I Selbstverstärkungseinrichtungen aufweisen (nicht dargestellt). Die Selbstverstärkungseinrichtungen 19 der Radbremsen 7 des Bremskreis II können in diesem Fall entfallen, müssen allerdings nicht entfallen. Die Selbstverstärkungseinrichtungen 19 der Radbremsen 7 haben den Vorteil, dass ein Bremskraftverstärker am Hauptbremszylinder 2 entbehrlich ist. Das ist insbesondere von Vorteil, wenn kein ausreichender oder gar kein Unterdruck für einen Unterdruck-Bremskraftverstärker verfügbar ist, wie es bei Dieselmotoren, teilweise bei modernen Ottomotoren, Hybrid-Fahrzeugen und Elektrofahrzeugen der Fall ist. The wheel brakes 7 of the brake circuit II have a hydraulic self-boosting device 19. Such self-boosting devices 19 are known and will not be explained in detail here. There are also other, for example mechanical self-reinforcing devices known and possible. The wheel brakes 6 of the brake circuit I can also have self-boosting devices (not shown). The self-boosting devices 19 of the wheel brakes 7 of the brake circuit II can be omitted in this case, but need not be omitted. The self-energizing devices 19 of the wheel brakes 7 have the advantage that a brake booster on the master cylinder 2 is dispensable. This is particularly advantageous when there is insufficient or no negative pressure available for a vacuum brake booster, as is the case with diesel engines, in part with modern gasoline engines, hybrid vehicles and electric vehicles.
Zur Prüfung der Funktionsfähigkeit des Bremskreis II wird bei jeder Bremsung ein Bremsdruckgradient, also die Geschwindigkeit des Bremsdruckaufbaus mit der Hydropumpe 10 mit einem der an die Radbremsen 7 angeschlossenen Drucksensoren 12 gemessen. Ist der Druckaufbau langsamer als üblich, weist das auf einen Fehler im Bremskreis II hin und das Fahrzeug ist zur Prüfung in eine Werkstatt zu bringen. Es kann beispielsweise ein Bremsdruckabsenkventil 9 undicht sein, was die Funktion des Bremskreis II beeinträchtigt, er kann sogar ganz aus- fallen. Insbesondere bei einer Störung der Fahrzeugbremsanlage 1 ist für eineTo test the functionality of the brake circuit II, a brake pressure gradient, ie the speed of the brake pressure build-up with the hydraulic pump 10 with one of the pressure sensors 12 connected to the wheel brakes 7, is measured during each braking operation. If the pressure build-up is slower than usual, this indicates a fault in the brake circuit II and the vehicle is to be brought to a workshop for testing. For example, a brake pressure reduction valve 9 may be leaking, which impairs the function of the brake circuit II; it may even fail completely. In particular, in a fault of the vehicle brake system 1 is for a
Hilfsbremsung, also den Druckaufbau mit dem Hauptbremszylinder 2 eine Dichtigkeit der Bremsdruckabsenkventile 9 zwingende Voraussetzung. Eine (beginnende) Undichtigkeit lässt sich mit dem erläuterten Prüfverfahren erkennen. Bei einer Betriebsbremsung wirkt der Bremskreis II als Fremdenergie-Auxiliary brake, so the pressure build-up with the master cylinder 2 a tightness of the brake pressure reduction valves 9 mandatory requirement. A (starting) leak can be recognized with the explained test method. During service braking, brake circuit II acts as a source of external energy.
Bremskreis, der Bremsdruck wird per Fremdenergie mit der Hydropumpe 10 und nicht per Muskelkraft mit dem Hauptbremszylinder 2 aufgebaut, der durch das geschlossene Trennventil 5 vom Bremskreis II getrennt ist. Eine Hilfsbremsung bei einer Störung erfolgt mit dem Hauptsbremszylinder 2, das Trennventil 5 bleibt in diesem Fall offen. Eine Regelung des Bremsdrucks im Bremskreis II wird bei einer Betriebsbremsung wie bereits gesagt mit dem Bremsdruckregelventil 18 durchgeführt, durch das die Druckseite der Hydropumpe 10 an den drucklosen Bremsflüssigkeitsvorratsbehälter 3 angeschlossen ist. Mit dem Druckregelventil 18 ist der Druck auf der Druckseite der Hydropumpe 10 und damit der Bremsdruck im Bremskreis II regelbar. Eine radindividuelle Regelung der Radbrems- drücke in den Radbremsen 7 mit den Bremsdruckaufbauventilen 8 und denBrake circuit, the brake pressure is by external energy with the hydraulic pump 10 and not built by muscle power with the master cylinder 2, which is separated by the closed separating valve 5 from the brake circuit II. An auxiliary braking in case of failure takes place with the master cylinder 2, the isolation valve 5 remains open in this case. A regulation of the brake pressure in the brake circuit II is carried out at a service brake as already said with the brake pressure control valve 18, through which the pressure side of the hydraulic pump 10 is connected to the pressureless brake fluid reservoir 3. With the pressure control valve 18, the pressure on the pressure side of the hydraulic pump 10 and thus the brake pressure in the brake circuit II can be regulated. A wheel-individual control of Radbrems- pressures in the wheel brakes 7 with the brake pressure build-up valves 8 and the
Bremsdruckabsenkventilen 9 ist grundsätzlich auch während oder zu einer Betriebsbremsung möglich, aber eigentlich nicht für eine Betriebsbremsung, sondern zur Schlupfregelung vorgesehen. Bremsdruckabsenkventilen 9 is basically also possible during or to a service braking, but not intended for a service braking, but for slip control.

Claims

Ansprüche claims
1 . Hydraulische Fahrzeugbremsanlage, die einen oder mehrere Bremskreise I, II aufweist, mit einem Hauptbremszylinder (2), der einen Bremsflüssigkeitsvorratsbehälter (3) aufweist, mit mindestens einer hydraulischen Radbremse (6, 7) in jedem Bremskreis I, II, die an den Hauptbremszylinder (2) angeschlossen ist, mit einer Hydropumpe (10) in jedem Bremskreis I, II, mit einem Trennventil (5), mit dem der Hauptbremszylinder (2) von einem Bremskreis I, II trennbar ist, mit einem der Radbremse (6, 7) zugeordneten Bremsdruckaufbauventil (8), das zwischen dem Trennventil (5) und der Radbremse (6, 7) angeordnet ist, und mit einem der Radbremse (6, 7) zugeordneten Bremsdruckabsenkventil (9), durch das die Radbremse (6, 7) mit einer Saugseite der Hydropumpe (10) verbindbar ist, wobei eine Druckseite der Hydropumpe (10) zwischen dem Trennventil (5) und dem Bremsdruckaufbauventil (8) angeschlossen ist, gekennzeichnet durch ein Druckregelventil (18), durch das der eine Bremskreis II mit dem Bremsflüssigkeitsvorratsbehälter (3) verbindbar ist. 1 . Hydraulic vehicle brake system having one or more brake circuits I, II, with a master brake cylinder (2) having a brake fluid reservoir (3), with at least one hydraulic wheel brake (6, 7) in each brake circuit I, II, to the master cylinder ( 2) is connected to a hydraulic pump (10) in each brake circuit I, II, with a separating valve (5), with which the master cylinder (2) of a brake circuit I, II is separable, with one of the wheel brake (6, 7) associated brake pressure build-up valve (8) which is arranged between the separating valve (5) and the wheel brake (6, 7), and with one of the wheel brake (6, 7) associated Bremsdruckabsenkventil (9) through which the wheel brake (6, 7) a suction side of the hydraulic pump (10) is connectable, wherein a pressure side of the hydraulic pump (10) between the separating valve (5) and the brake pressure build-up valve (8) is connected, characterized by a pressure regulating valve (18) through which a brake circuit II with the brake fluid igkeitsvorratsbehälter (3) is connectable.
2. Hydraulische Fahrzeugbremsanlage nach Anspruch 1 , dadurch gekennzeichnet, dass das Druckregelventil (18) zwischen einer Druckseite der Hydropumpe (10) und dem Bremsflüssigkeitsvorratsbehälter (3) angeordnet ist. 2. Hydraulic vehicle brake system according to claim 1, characterized in that the pressure regulating valve (18) between a pressure side of the hydraulic pump (10) and the brake fluid reservoir (3) is arranged.
3. Hydraulische Fahrzeugbremsanlage nach Anspruch 1 , dadurch gekennzeichnet, dass die Saugseite der Hydropumpe (10) an den Bremsflüssigkeitsvorratsbehälter (2) angeschlossen ist. 3. Hydraulic vehicle brake system according to claim 1, characterized in that the suction side of the hydraulic pump (10) to the brake fluid reservoir (2) is connected.
4. Hydraulische Fahrzeugbremsanlage nach Anspruch 1 , dadurch gekennzeichnet, dass die mindestens eine Radbremse (7) durch das ihr zugeordnete Bremsdrucksabsenkventil (9) mit dem Bremsflüssigkeitsvorratsbehälter (3) verbindbar ist. 4. Hydraulic vehicle brake system according to claim 1, characterized in that the at least one wheel brake (7) by its associated Bremsdrucksabsenkventil (9) with the brake fluid reservoir (3) is connectable.
5. Hydraulische Fahrzeugbremsanlage nach Anspruch 1 , dadurch gekennzeichnet, dass mindestens eine Radbremse (7) eine Selbstverstärkungseinrichtung (19) aufweist. 5. Hydraulic vehicle brake system according to claim 1, characterized in that at least one wheel brake (7) has a self-boosting device (19).
6. Verfahren zu einer Betätigung einer hydraulischen Fahrzeugbremsanlage (1 ), die einen oder mehrere Bremskreise I, II aufweist, mit einem Hauptbremszylinder (2), der einen Bremsflüssigkeitsvorratsbehälter (3) aufweist, mit mindestens einer hydraulischen Radbremse (6, 7) in jedem Bremskreis I, II, die an den Hauptsbremszylinder (2) angeschlossen ist, mit einer Hydropumpe (10) in jedem Bremskreis I, II, mit einem Trennventil (5), mit dem der Hauptbremszylinder (2) von einem Bremskreis I, II trennbar ist, mit einem der Radbremse (6, 7) zugeordneten Bremsdruckaufbauventil (8), das zwischen dem Trennventil (5) und der Radbremse (6, 7) angeordnet ist, und mit einem der Radbremse (6, 7) zugeordneten Bremsdruckabsenkventil (9), durch das die Radbremse (6, 7) mit einer Saugseite der Hydropumpe (10) verbindbar ist, wobei eine Druckseite der Hydropumpe (10) zwischen dem Trennventil (5) und dem Bremsdruckaufbauventil (8) angeschlossen ist, dadurch gekennzeichnet, dass die Fahrzeugbremsanlage (1 ) ein Druckregelventil (18) aufweist, durch das der eine Bremskreis II mit dem Bremsflüssigkeitsvorratsbehälter (3) verbindbar ist, und dass zu einer Betriebsbremsung das Trennventil (5) geschlossen, die Hydropumpe (10) eingeschaltet und ein Radbremsdruck in der mindestens einen Radbremse (7) des einen Bremskreis II mit dem Druckregelventil (18) geregelt wird. 6. A method for actuating a hydraulic vehicle brake system (1) having one or more brake circuits I, II, with a master cylinder (2) having a brake fluid reservoir (3), with at least one hydraulic wheel brake (6, 7) in each Brake circuit I, II, which is connected to the master cylinder (2), with a hydraulic pump (10) in each brake circuit I, II, with a separating valve (5), with the master cylinder (2) of a brake circuit I, II is separable with a brake pressure build-up valve (8) associated with one of the wheel brakes (6, 7), which is arranged between the isolation valve (5) and the wheel brake (6, 7), and with a brake pressure reduction valve (9) assigned to the wheel brake (6, 7), by which the wheel brake (6, 7) with a suction side of the hydraulic pump (10) is connectable, wherein a pressure side of the hydraulic pump (10) between the separating valve (5) and the brake pressure build-up valve (8) is connected, characterized in that the vehicle brake system (1) has a pressure control valve (18) through which a brake circuit II with the brake fluid reservoir (3) is connectable, and that for a service braking the isolation valve (5) closed, the hydraulic pump (10) turned on and a wheel brake pressure in the at least one Wheel brake (7) of a brake circuit II with the pressure control valve (18) is controlled.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass ein Bremsdruckaufbau mit der Hydropumpe (10) bei einer Betriebsbremsung überwacht wird. 7. The method according to claim 6, characterized in that a brake pressure build-up with the hydraulic pump (10) is monitored during a service braking.
PCT/EP2010/065301 2009-12-10 2010-10-13 Hydraulic vehicle braking system WO2011069715A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009054492.5 2009-12-10
DE200910054492 DE102009054492A1 (en) 2009-12-10 2009-12-10 Hydraulic vehicle brake system

Publications (1)

Publication Number Publication Date
WO2011069715A1 true WO2011069715A1 (en) 2011-06-16

Family

ID=43332612

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/065301 WO2011069715A1 (en) 2009-12-10 2010-10-13 Hydraulic vehicle braking system

Country Status (2)

Country Link
DE (1) DE102009054492A1 (en)
WO (1) WO2011069715A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103963762A (en) * 2013-01-15 2014-08-06 罗伯特·博世有限公司 Device for hydraulic brake system, brake system, control device and method for operating the system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3627809A1 (en) * 1986-08-16 1988-02-18 Teves Gmbh Alfred HYDRAULIC BRAKE SYSTEM WITH ANTI-BLOCKING PROTECTION AND / OR DRIVE SLIP CONTROL
DE4029793A1 (en) * 1990-09-20 1992-03-26 Bosch Gmbh Robert Hydraulic servo brakes with ABS for motor vehicle - uses one pressure sensor per brake circuit and one pressure sensor on master cylinder
DE4106336A1 (en) * 1991-02-28 1992-09-03 Bosch Gmbh Robert HYDRAULIC BRAKE SYSTEM, ESPECIALLY FOR MOTOR VEHICLES
WO2008135301A1 (en) * 2007-05-02 2008-11-13 Robert Bosch Gmbh Hydraulic vehicle brake system and method for its operation
WO2009089944A1 (en) * 2008-01-14 2009-07-23 Robert Bosch Gmbh Braking system and method for controlling a braking system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3627809A1 (en) * 1986-08-16 1988-02-18 Teves Gmbh Alfred HYDRAULIC BRAKE SYSTEM WITH ANTI-BLOCKING PROTECTION AND / OR DRIVE SLIP CONTROL
DE4029793A1 (en) * 1990-09-20 1992-03-26 Bosch Gmbh Robert Hydraulic servo brakes with ABS for motor vehicle - uses one pressure sensor per brake circuit and one pressure sensor on master cylinder
DE4106336A1 (en) * 1991-02-28 1992-09-03 Bosch Gmbh Robert HYDRAULIC BRAKE SYSTEM, ESPECIALLY FOR MOTOR VEHICLES
WO2008135301A1 (en) * 2007-05-02 2008-11-13 Robert Bosch Gmbh Hydraulic vehicle brake system and method for its operation
WO2009089944A1 (en) * 2008-01-14 2009-07-23 Robert Bosch Gmbh Braking system and method for controlling a braking system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103963762A (en) * 2013-01-15 2014-08-06 罗伯特·博世有限公司 Device for hydraulic brake system, brake system, control device and method for operating the system
EP2754591A3 (en) * 2013-01-15 2015-03-18 Robert Bosch Gmbh Device for a hydraulic brake system, hydraulic brake system, control device for interaction with a hydraulic braking system and method for operating a hydraulic brake system

Also Published As

Publication number Publication date
DE102009054492A1 (en) 2011-06-16

Similar Documents

Publication Publication Date Title
EP2229302B1 (en) Brake system for a vehicle, and brake pedal device for such a brake system
EP2379375B1 (en) Brake system for a motor vehicle and method for controlling said brake system
EP2675671B1 (en) Hydraulic vehicle brake system
WO2012152352A1 (en) Hydraulic vehicle braking system with electromechanical actuator, and method for operating such a hydraulic vehicle braking system
WO2008058985A1 (en) Vehicle brake system for motor vehicles and method for operating it
DE102020103660A1 (en) Driving dynamics system, e-vehicle with central control (M-ECU)
DE102014200071A1 (en) Brake system for a motor vehicle
EP3962792B1 (en) Brake system and method for controlling a brake system
WO2020025188A1 (en) Method for testing the functionality of a hydraulic vehicle brake system
EP1339582A1 (en) Method for controlling an electrohydraulic braking system
DE102018133218A1 (en) Redundant braking system with a pressure supply for e-vehicles and vehicles with autonomous driving from level 3 (HAD) to level 4 (FAD)
DE102018133189A1 (en) Redundant braking system with 2 pressure supplies for electric vehicles and vehicles with autonomous driving from level 3 (HAD) to level 5 (AD)
EP3924229A1 (en) Brake system with a pressure supply device and a safety gate for the brake circuit
EP2419309B1 (en) Method of controlling a vehicle where only the rear axle is braked and brake slip controller
DE102019206707A1 (en) Method for controlling an electronically slip-regulated external power brake system, in particular for a piloted motor vehicle and piloted motor vehicle
WO2011069715A1 (en) Hydraulic vehicle braking system
WO2009074527A1 (en) Electrohydraulic external force vehicle braking system
WO2021160297A1 (en) Brake system
DE102019214899A1 (en) Multi-circuit braking system for a vehicle and corresponding operating method
DE102019214898A1 (en) Brake system network for a vehicle and corresponding operating procedure
DE102019123351A1 (en) Braking device, in particular for electrically powered motor vehicles
DE10304145A1 (en) Electrohydraulic vehicle braking system has isolating valve between brake cylinder and brake fluid supply tank that can be controlled independently of operation of main brake cylinder
DE102012221346A1 (en) Brake system for motor vehicles, has electrically actuated pressure modulating valve that sets wheel-specific braking pressure and is formed as idle closed two by two-way valve
DE102020212413A1 (en) Service braking with a hydraulic multi-circuit externally powered vehicle brake system
DE102019201774A1 (en) Brake system and related operating procedure

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10772999

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 10772999

Country of ref document: EP

Kind code of ref document: A1