EP3119649A1

EP3119649A1 - Electrohydraulic assembly and brake system

Info

Publication number: EP3119649A1
Application number: EP15709664.5A
Authority: EP
Inventors: Andreas Heise; Jürgen SCHERSCHMIDT
Original assignee: Continental Teves AG and Co OHG
Current assignee: Continental Teves AG and Co OHG
Priority date: 2014-03-18
Filing date: 2015-03-09
Publication date: 2017-01-25
Also published as: KR20160132401A; CN106103218A; US20170232947A1; WO2015139983A1; DE102014204981A1

Abstract

Electrohydraulic assembly (1, 1', 1'') for a brake system, having a hydraulic unit (10) comprising a housing body (11) which houses electrically actuable valves (12) and a hydraulic pump (13), having an electric drive apparatus (14) for the pump, having an electronic unit (20) arranged on the housing body for controlling the valves and/or the drive apparatus, and having a pressure medium reservoir (30, 30', 30'') which comprises a first space (31) for pressure medium, a vented second space (32) and a media-separating element (33) that separates the first space from the second space, wherein the pressure medium reservoir is connected to a suction side of the pump, and wherein the pressure medium reservoir (30, 30', 30'') is embodied as a pressure medium supply reservoir to keep pressure medium ready for the pump (13) for increasing brake pressure or while the pump increases brake pressure, and brake system having such an assembly.

Description

Electro-hydraulic unit and brake system

The invention relates to an electro-hydraulic unit according to the preamble of claim 1 and to a brake system according to the preamble of claim 12.

In DE 10 2007 047 202 AI an electro-hydraulic unit for a slip-controlled vehicle brake system of ^¬ fenbart with a receiving body, the valve holes and a pump comprises, with an electric motor for driving the pump, and with a flanged to the receiving body electronic control unit for controlling Electric motor and / or hydraulic valves. Furthermore, the receiving body has bores for low-pressure accumulator with spring-loaded pistons, wherein the piston separates a hydraulic region from an atmospheric region of the low-pressure accumulator. The low-pressure accumulator are used only for temporary recording of pressure medium, which is discharged for example during an anti-skid control from the wheel brakes and then fed back. In the factory state of the unit or in the idle state of the vehicle, the low ^¬ pressure accumulator are unfilled. The atmospheric region of the low-pressure accumulator is vented via a ventilation channel to the outside to the ambient atmosphere, wherein the ventilation channel ends on the electronic control unit opposite side of the receiving body.

There are hydraulic brake systems for various power ^¬ vehicles, such as two-wheeled or four-wheeled vehicles, known. In the future, more and more motor vehicles will come on the market, in which braking can be initiated automatically not only via a foot or hand operated brake actuator by the driver, but also by a vehicle system. Automated braking is particularly an absolute requirement for vehicles with highly automated Driving function or with autonomous driving function, the vehicle is driving automatically and without the involvement of the driver. In order to ensure sufficient safety in this case, increased demands must be placed on the electrically controllable, hydraulic brake actuators of the brake system.

Brake systems are known in which an electromotive actuator promotes pressure medium in one or more wheel brakes. An important aspect of such brake systems is that sufficient pressure medium is available to perform the operation of the wheel brakes can. It is known to suck pressure medium from a pressure medium reservoir connected to the actuator via a pipe or hose line. For example, goes from DE 10 2012 214 586 AI a

Motorcycle brake system shown in which a rear wheel brake is pressurized by activation of a means of an electric motor attached ^¬ driven pump with pressure, wherein said arranged in an electro-hydraulic unit pump via a remotely located pressure fluid reservoir provides the necessary pressure medium available is.

From WO 2012/143313 AI a "brake-by-wire" -Bremsanlage for motor vehicles known with a first electrohydraulic module with a pump and a second module with a master cylinder and a further pressure source, the second module associated with a pressure medium reservoir is. In this case, the pump is connected on the suction side by the second module with the pressure medium reservoir.

A disadvantage of the brake systems mentioned that a rapid suction of pressure fluid due to the flow characteristics of the pressure medium and the limited cross-section and the length of the intake, and optionally in the intake arranged components such as valves, not or only to a limited extent possible.

It is therefore an object of the present invention to provide a brake system and an electro-hydraulic unit with a pump for a brake system, which allows rapid provision of pressure medium by the pump.

This object is achieved by an electro-hydraulic ^¬ lisches unit according to claim 1 and a brake system according to claim 12.

The invention is based on the idea to provide in the electrohydraulic unit at least one accumulator, which is designed as a pressure medium reservoir for the provision of pressure medium for the pump for a brake ^¬ pressure buildup by means of the pump or during a brake pressure ^¬ construction by means of the pump.

The invention has the advantage that the unit can be used in ver ^¬ different ^{types of} brake system, with pressure medium is largely unhindered and independent of the rest of the structure of the brake system for the pump available. Even with errors in a leading to the aggregate brake line, such as a demolition of the brake line, a brake system according to the invention, at least temporarily

Build up brake pressure.

Preferably, the pressure fluid reservoir is filled with pressure medium in a quiescent state or an operational state of the electro-hydraulic unit, so that pressure medium is sufficiently available for a next braking operation. According to one embodiment of the invention, the second space is connected via a means for ventilation with an arranged between the receiving body and a housing of the electronics unit interior, ie, the second space of the pressure medium reservoir is vented to the interior of the electronic unit out. As a result, there is sufficient clean air volume for sucking into the second space in the case of removal of pressure medium from the first room available. The interior is particularly preferably the area of the electronics unit in which electrical and / or electronic components are arranged.

In order to produce no or only a slight suction resistance, the air-filled volume of the interior is preferably a multiple of the volume of the first space.

In order to further reduce the suction resistance and / or to avoid differential pressures resulting from thermal expansion, at least one means for ventilating the interior of the electronics unit is preferably provided in the housing of the electronics unit. This particularly preferably comprises a gas-permeable ^¬ and advantageously liquid-tight,

Membrane element.

Preferably, the pressure fluid reservoir is designed such that the pressure fluid reservoir automatically refills itself after the pressure fluid reservoir pressure medium has been removed.

For receiving leakage, a pressure medium ^¬ absorbing, advantageously sponge-like, element is preferably provided in a region in which the pressure fluid accumulator is arranged to the interior of the electronic unit. The element can absorb any small leaks.

According to a preferred embodiment of the unit according to the invention is a detection device for detecting or _n

5

Monitoring a level of the accumulator before ^¬ seen. This is particularly preferably arranged to ^¬ in a range between the receiving body and the housing of the electronic unit, advantageously in the range of the means for loading ventilation of the second space.

It is preferred that the detection device comprises a first sensor element, which is arranged in the electronic unit, and a second element, which is fastened on the media separating element. This allows a simple and direct sensing of the movement or position or position of the media separating element and thus of a filling level of the pressure ^¬ medium memory. Preferably, the pressure fluid accumulator is designed as a bellows storage, which comprises a support body and an elastic media separating element, wherein the supporting body and the elastic media separating element define the second space. Particularly preferred is the support body made of metal.

Preferably, the support body is arranged on the side facing the electronics unit side of the receiving body of the hydraulic unit. This allows easy ventilation of the second space of the accumulator to the interior of the electronics unit.

Alternatively, it is preferred that the pressure fluid accumulator is guided out of a piston accumulator with a piston as a media ^{separating element} .

The means for ventilating the second space is preferably a bore or a ventilation channel. Particularly preferably, the bore or the ventilation channel in the support body of the

Pressure medium storage arranged. .

b

The invention also relates to a brake system having a ^¬ he inventive electro-hydraulic aggregate. It is a brake system for a motorcycle or for a motor vehicle with a brake actuator and with hydraulic

actuated wheel brakes.

Preferably, the pressure fluid accumulator of the electro-hydraulic unit is designed such that the pressure fluid stored in the accumulator pressure medium volume for actuating the wheel brake or the wheel brakes, which is or are connected to the accumulator, sufficient to overcome a clearance and to perform a service brake on the wheel or the wheel brakes , By means of the accumulator can thus at least one emergency braking be performed independently of the other pressure medium supply of the brake system.

The brake system preferably comprises in addition to the one or more built-in electrohydraulic aggregate pressure fluid reservoir (s) connected to atmospheric pressure pressure fluid reservoir, which is connected to the pressure fluid reservoir or connectable. The pressure medium reservoir is used for sucking pressure fluid in the / the pressure fluid reservoir of the electro-hydraulic unit. Alternatively or additionally, the brake system preferably comprises in addition to the one or more integrated in the electro-hydraulic power unit accumulator (s), for example, by an operator or the driver, readable pressure medium display means which is connected to the accumulator or connectable. The pressure medium display means is particularly preferably designed as a sight glass or window. The Druckmit ^¬ tel-display means is the optical control of the pressure ^¬ medium level. According to a development of the brake system according to the invention, the latter comprises a pressure generator with at least one pressure output connection, wherein the pressure output connection is connected or connectable to the pressure medium reservoir (s). The accumulator is particularly preferably carried out high pressure resistant, if the input side, a pressure can be applied. The pressure generator is particularly preferably designed as an actuatable by means of the actuator master cylinder or as an electrically controllable pressure generator.

Further preferred embodiments of the invention will become apparent from the subclaims and the following description with reference to figures. It show schematically

1 shows an exemplary motorcycle brake system with a first embodiment of an electro-hydraulic unit according to the invention,

2 shows an exemplary vehicle brake system with a second exemplary embodiment of an electrohydraulic unit according to the invention, FIG. 3 shows an exemplary vehicle brake system with a third exemplary embodiment of an electrohydraulic unit according to the invention,

Fig. 4 shows a detail of the embodiment of Fig. 3, and

Fig. 5 shows a detail of a fourth embodiment of an electro-hydraulic unit according to the invention. ₀

O

Fig. 1 shows an exemplary motorcycle brake system in a schematic representation with a first embodiment of an electro-hydraulic unit according to the invention. The brake system comprises a first, the front wheel VR associated, hydraulically actuated wheel 40a and a second, the rear wheel HR associated, hydraulically actuated wheel brake 40b.

The front wheel brake 40a is hydraulically operable by a driver by means of a master cylinder 2 operable by means of a brake operating member 3 (eg, a handbrake lever). The master cylinder 2 is associated with a standing under atmospheric pressure fluid reservoir 4a. For brake slip control are in the front wheel brake circuit I electro ^¬ magnetically actuated intake and exhaust valves 12a, employed 12b with the open in the basic position (normally open) inlet valve before ^¬ derradbremskreises is inserted I 12a in the brake pipe 16a of which the master ^¬ cylinder 2 with the Front brake 40a connects. The closed in the basic position (normally closed) outlet valve 12b is inserted into a return line 17 of the brake circuit I, which connects the front brake 40a with a low ^¬ pressure accumulator 18 and one of the suction sides of a zweikreisig split piston pump 13, which operates on the Rückförderprinzip. The associated pressure side of the piston pump 13 is upstream of the inlet valve 12 a with the

Brake line 16a in conjunction so that a demand-based recovery of the discharged from the front brake 40a in the low-pressure accumulator 18 pressure medium volume is ensured. In the unactuated state of the brake system, the low-pressure accumulator is normally empty.

The rear wheel brake 40b is, for example, only electrically actuated. The brake actuating element 5 for actuating the rear wheel brake (eg a foot brake lever) is for this purpose with a Simulator 6 coupled, which is a familiar to the driver

Brake lever feeling conveys. By means of a detection device 7, an actuating travel or angle of the brake ^lining tätigungselements 5, or alternatively, an actuating part of the force / travel simulator 6 is detected. The signal of the He ^¬ detecting means 7 is 20 of the electrohydraulic raulischen unit 1 of the brake system supplied to an electronic unit (ECU, electric / electronic control unit), by means of which a corresponding control of the piston pump 13 to build up a pressure at the rear brake 40b performed. The suction side of the pump 13 of the rear wheel brake circuit II is connected via a suction line 19b to a second pressure medium reservoir 4b (or a second chamber 4b of the pressure medium reservoir) and to a pressure medium reservoir 30. The associated pressure side of the piston pump 13 is connected via a brake line 16b of the rear wheel brake circuit I to the rear wheel brake 40b. Parallel to the piston pump 13 is an open in the basic position (normally open)

Disconnecting valve 12c arranged so that the rear wheel brake 40b is connected to the pressure medium reservoir 4b and the accumulator 30 with the separating valve 12c open. In order to build up a pressure in the rear wheel brake 40b by means of the pump 13, the separating valve 12c is closed and conveyed by means of the pump 13 pressure medium in the rear wheel brake 40b.

The piston pump 13 of the motorcycle brake system has beispielsgemäß for each brake circuit I, II a valve circuit with unspecified suction valve and unspecified

Pressure valve, which are preferably designed as a spring-loaded check valves.

The electro-hydraulic unit 1 comprises a hydraulic unit (HCU) 10 with a receiving body 11, the electronic unit 20 with a housing 21 and an electric drive device 14, eg an electric motor, for the pump. Electronics unit 20 is arranged on the receiving body 11, so that between housing 21 and receiving body 11, an interior 22 is formed, in which example, electrical and / or electronic components of the electronic unit 20, such as an evaluation circuit for the signal of the detection device 7 and / or valve coils for the electromagnetic control of the valves 12a, 12b, 12c, are arranged. Electronics unit 20 is connected via an elekt ^¬ cal system connector 9 with an electrical energy source and advantageously with a vehicle data bus.

Receiving body 11 takes example according to the electrical

operable valves 12a, 12b, 12c, the piston pump 13, the low pressure accumulator 18, the accumulator 30 and each brake circuit I, II a wheel brake 40a, 40b associated pressure sensor 15. There may be other pressure sensors (not shown in FIG. 1), which are then also received by the receiving body 11.

Pressure fluid accumulator 30 includes a first space 31 for

Pressure medium, a ventilated second space 32 and a medientric 33, which separates the first space 31 from the second space 32.

By way of example, the accumulator 30 is formed as a bellows accumulator with elastomer. Here, pressure ^{¬ means} memory 30 comprises a support body 36 which is, for example, cylindrical and made of metal, in which the media separating element 33 is disposed of elastomer. For aeration of the second space 32, a ventilation means, for example a bore, 34 is provided in the support body 36, through which the second space 32 is connected to the interior 22 of the electronics unit 20. Pressure fluid reservoir 30 thus provides a bellows-prone

Brake fluid reservoir with ventilation opening dar. Pressure medium accumulator 30 represents a pressure fluid reservoir for the provision of pressure medium for the pump 13 of the rear wheel brake II. For or during a brake ^¬ pressure build-up on the rear brake 40b by means of the pump 13, the accumulator 30 supplies the pressure means for the actuation of the rear brake 40b. Accordingly, pressure ^¬ memory 30 is filled in its idle state or in its normal state with pressure medium. When the first chamber 31 of the accumulator 30 pressure ^¬ medium volume is removed by the pump 13, a corresponding volume of air from the interior 22 is sucked into the second space 32. Advantageously, the pressure medium ^¬ memory 30 is self-axially executed.

In the embodiment of the Belgspeichers with elastomer, the media separating element 33 moves by its own material ^¬ voltages back to the starting position, as soon as no

Suction by the pump 13 prevails more, so that the pressure medium reservoir 30, e.g. from the pressure fluid reservoir 4b, refilled.

The exemplary motorcycle brake system of FIG. 1 is constructed such that acts on the pressure fluid accumulator 30 no appreciable form. Pressure fluid accumulator 30 is therefore designed such that the pressure fluid accumulator 30 is preferably refilled automatically by a small "Eigensaugkraft" after pressure fluid has been removed from the accumulator 30.

Fig. 2 shows a schematic representation of an exemplary motor vehicle brake system for example, a car with a second embodiment of an electro-hydraulic unit according to the invention. The brake system is dual-circuit executed. The brake system comprises either 40a only two hyd ^¬ raulisch actuated wheel brakes, 40b (the other wheel brakes of the car for example can be designed electromechanically actuated) or comprises two further, not shown, similarly constructed modules, so that there are four hydraulically operated wheel brakes can be actuated, wherein only one wheel brake 40a, 40b for brake circuit I and II is shown in FIG. An extension to more than four hydraulically actuated wheel brakes is of course possible accordingly.

The electro-hydraulic unit 1 ^λ comprises, for example, a hydraulic unit (HCU) 10 ^λ with a receiving body 11, an electronic unit 20 with a housing 21 and an electric drive device 14, for example an electric motor, for driving a dual-circuit split piston pump 13 piston pump 13 can also mehrkreisig ( three, etc. vierkreisig not Darge ^¬ provides) be executed. Electronic unit 20 is arranged on the receiving body 11, so that between housing 21 and receiving body 11, an interior 22 is formed, in which example, electrical and / or electronic components of the electronic unit 20, such as a detection and / or evaluation circuit for the signals of the pressure sensors 15 and the control electronics of the valves 12 c, are arranged. Electr ^¬ ronikeinheit 20 is advantageously connected via an electrical system connector 9 to an electrical power source and a vehicle data bus.

For each brake circuit I, II, the unit 1 ^λ comprises an input connection 100a, 100b for a brake line 101a, 101b. The brake lines 101a, 101 may come from a pressure generator 50 or various pressure generators (not shown), for example, a pressure generator 50 in Fig. 2 is indicated by dashed lines. On the brake lines 101a, 101b can thus rest a form. Each brake circuit I, II is the input terminal 100a, 100b connected to the associated suction side of the piston pump 13 of the brake circuit I, II and the input terminal of a pump connected in parallel, normally open isolation valve 12c. The pressure side of the piston pump 13 and the starting terminal of the isolation valve 12c are ^¬ means of the braking circuit 16a, 16b according to the wheel brake 40a, 40b (or the wheel brakes) is connected.

Pressure generator 50 may be e.g. be a brake pedal actuated or a brake pedal and electric motor operable master cylinder or a purely electrically controllable pressure source. A (further) brake control device (for example, a conventional ESC (Electronic Stability Control) with pump and valves), preferably with several output circuits, is also advantageous.

Each brake circuit I, II, a pressure medium reservoir 30 ^λ is further provided, which is connected to the respective suction side of the piston pump 13 and which is a pressure medium reservoir for the provision of pressure medium for the pump 13 of the respective brake circuit I, II.

If more than two wheel circuits are operated, the module elements can be designed several times.

The pressure fluid reservoir 30 ^λ are executed as example ^{according to the} piston ^¬ memory. In a cylindrical exception in the receiving body 11, a piston is arranged as a medium separating element 33 ^λ , which separates a first space 31 for pressure medium from a ventilated second chamber 32. For ventilation of the second space 32 are each ventilation means 34, for example holes, provided by which air from the interior 22 of the

Electronics unit 20 can flow into the second space 32. That is, the accumulator 30 ^λ are the electronics unit 20 and whose interior 22 responds. Are a corresponding to the removed from the accumulator 30 ^λ pressure fluid volume air volume can be so removed from the between the hydraulic unit (HCU) 10 ^λ and electronics unit 20 existing air volume. Pressure fluid reservoir 30 ^λ thus represents a piston-laden brake fluid reservoir.

Pressure medium accumulator 30 ^λ is designed high pressure resistant and filled at rest.

Pressure fluid reservoir 30 ^λ is a constant pressure reservoir.

Depending on the brake circuit I, II, the pump 13 can suck independently of one another via the intake line 19a, 19b pressure medium from the pressure medium store 30 ^λ .

Advantageously, the electronics unit 20 or its interior 22 is ventilated to the atmosphere. For this purpose, a means for aeration 23 is arranged in the housing 21 of the electronics unit 20. According to the example, a membrane element 23 or a plurality of membrane elements is arranged in the housing 21. The membrane element is gas-permeable (respiratory membrane), and advantageously liquid-tight. Receiving body 11 takes example according to the electrical

operable valves 12c, the piston pump 13, the Druckmit ^¬ telspeicher 30 ^λ and the pressure sensors 15 on.

In brake systems, in which a brake pressure (eg form) can occur on the lying in the suction path of the pump line section, the pressure fluid reservoir 30 ^λ advantageously as a high-pressure volume memory (volume dispenser) running, although allowed a slight suction, but in other normal operation except the refilling of the printing means memory ^λ as ^far as no pressure medium volume absorbs, so as not to hinder the normal braking function. So that the smallest possible volume intake can be achieved, for example, the volume accumulator and its cap is very stable, ie under pressure little expansive executed (eg made of metal).

Fig. 3 shows a schematic representation of an exemplary motor vehicle brake system for example, a car with a third embodiment of an electro-hydraulic unit according to the invention. The brake system corresponds We ^¬ sentlichen the brake system of Fig. 2, only the accumulator 30 ^{λ λ} of the electrohydraulic unit 1 ^{λ λ} are made different. Pressure medium reservoir 30 ^{λ λ} represents an alternative bellows reservoir with ventilation opening, "self-resetting" elastomeric element and optional detection device.

A section of the hydraulic unit 10 ^{λ λ} or of the receiving ^¬ body 11 with a pressure medium storage 30 ^{λ λ} without a detection device is shown enlarged in Fig. 4. FIG. 4a shows the accumulator 30 ^{λ λ} in the (fully) filled state and FIG. 4b shows the accumulator 30 ^{λ λ} in a partially depleted state. Pressure medium accumulator 30 ^{λ λ} comprises a support body 36 ^{λ λ} and a medium separating element 33 ^{λ λ} , which separates a first space 31 with pressure medium from a second space 32 with air.

For example, the media separating element 33 ^{λ λ} is designed as a "self-resetting" elastomeric molded element or "self-resetting" elastomer molded article.

Supporting body 36 is formed, for example, by a metal lid, which on the hydraulic unit 10 ^{λ λ} on the Elekt ^¬ ronikeinheit 20 facing surface attached (eg caulked or screwed) is. The support body is designed, for example, as a flat, domed cover. The support body may for example be attached to the hydraulic unit 10 ^{λ λ} by caulking. In the support body 36, a ventilation means 34 is provided in the form of a breathing opening through which the second space 32 is connected to the interior 22 of the electronics unit 20 (not shown in Fig. 4).

In the completely filled state of the bellows accumulator (FIG. 4 a), the media ^{separating element} 33 ^{λ λ is supported} on the supporting body 36 ^λλ . The elastomer molded body 33 ^{λ λ} is relaxed.

Optionally, the accumulator 30 ^{λ λ is provided} with a detection device for detecting the level of the reservoir. In Fig. 5, a detail of a fourth embodiment of a elektrohydrau ^¬ lic aggregate invention is shown schematically according to the invention. The elektrohyd ^¬ raulischen unit corresponds to the additional He ^¬ detection means 35 to the electro-hydraulic unit 1 ^{λ λ} of FIG. 3. FIG. 5 for clarity have been shown only the portion of the receiving body 11 because of the hydraulic unit 10 ^{λ λ} and their components, one of the Druckmit ^¬ telspeicher 30 ^{λ λ shown} with detection device 35. The valves 12c, the pump 13, the drive device 14, the lines 16a, 16b, 19a, 19b (except for a short section of the suction line to the pressure medium reservoir 30 ^{λ λ} ) and the pressure sensors 15 are not shown. FIG. 5a shows the accumulator 30 ^{λ λ} in the (fully) filled state and FIG. 5b in a partially depleted state.

In the interior 22, which is formed between the housing 21 of the electronics unit 20 and the receiving body 11, a printed circuit board 24 is shown in ^¬ game according to which electrical and / or electronic components of the electric nikeinheit 20 are arranged and which is connected to the electrical system connector 9.

Detection device 35 includes, for example, a first sensor element 37 and a second element 38, wherein the first sensor element 37 on the circuit board 24 in the area or. opposite to the aeration means (the opening / bore) 34 in the

Support body 36 ^{λ λ is} arranged and the second element 38 is fixed in the region of the aeration means 34 to the medium separating element 33 ^{λ λ} . The sensor element 37 and the to be sensed

Element 38 interact with each other so that an approximation or removal of the second element 38 from the first sensor element 37 or a distance between the elements 37, 38 can be detected. Sensor element 37 thus senses the position of the element 38.

Element 38 is preferably ferromagnetic metal.

According to the example, the second element 38 is rod-shaped or pin-shaped. In the completely filled state of the Druckmit ^¬ telspeicher 30 ^{λ λ} (Fig. 5a), when the medium separating element 33 ^{λ λ} on the support body 36 ^{λ λ is} supported, the second member 38 projects through the ventilation opening 34 into the interior 22. The distance between the Elements 37, 38 is then minimal. In the partially depleted state of the accumulator 30 ^{λ λ} (Fig. 5b), when the second space 32 has increased and the medi ^¬ entrennelement 33 ^{λ λ} arranged second element 38 is therefore so ^¬ canceled retracted, the distance between the elements 37, 38 enlarged. The distance between the elements 37, 38 is thus a measure of the filling state of the Druckmit ^¬ telspeicher 30 ^{λ λ} .

A corresponding detection device 35 can, of course, also be used in differently designed pressure medium reservoirs, For example, the pressure medium stores 30, 30 ^λ according to the first and second embodiments, are used.

In the electrohydraulic units according to the invention, the problem of "impaired intake of pressure medium" is solved by providing one or more pressure fluid volume reservoirs in the aggregate which completely or at least partially excludes a wheel or brake ^circuit relevant pressure medium volume without relevant suction resistance of the pump unit provides. the one or more accumulator / pressure medium ^¬ volume accumulators are therefore located in the brake activity exporting means of the pump electro-hydraulic unit / control unit HCU, ECU. Preferably, represents one or more cubic centimeter pressure fluid volume provides a pressure medium store.

The accumulator is preferably designed as a bellows storage or a piston accumulator.

In the case of a brake system in which a form can load on the accumulator, the accumulator does not necessarily have a resilience. In the case of a brake system in which no appreciable pre-pressure can load on the accumulator, the accumulator has particularly preferably a slight resilience, so that after pressure medium volume has been sucked, this again fills independently.

The second space of the accumulator is preferably in the electronics unit or in the (indoor) space in Aggre ^¬ gat / control unit, in which usually the electronics and the valve coils are housed, ventilate. This has various Advantages. The control unit is a clean area that is protected from contamination (dust, water, etc.). Also, the room is usually already ventilated to reduce excess and negative pressures (in particular by temperature expansions, but also atmospheric pressure fluctuations). Another advantage is the relatively large volume of the interior space. Even in the worst case, if air can not flow into the interior quickly enough due to the respiration, the suction resistance is only minimally increased.

The invention preferably relates to a self-generating bremsdru- sugar-performance, electro-hydraulic or two-wheeled motor vehicle brake system unit with one or more inte grated ^¬ pressure fluid volume reservoirs or Druckmittelspei ^¬ manuals, wherein the pressure medium reservoir in the rest state with

Pressure medium is filled or fills, and the desired pressure fluid volume ^{bereitge ¬} the suction of pressure medium, and a suctioned volume of the corresponding volume of air from a ventilated inner air volume of the electro-hydraulic unit, in which electronic and / or electromechanical components are installed, is withdrawn ,

Preferably, the pressure medium volume of the accumulator is structurally greater than the pressure medium volume, which is required in order to generate sufficient brake pressure in the or the associated wheel brakes out of the typical rest state and thereby to be able to decelerate the wheel / wheels.

Preferably, the air volume of the electro-hydraulic unit is a multiple, for example, greater than a tenfold, of the deductible by the accumulator volume volume. Preferably, the one or more pressure medium reservoirs are fed by a Ver ^¬ supply line can be acted upon at least temporarily with brake pressure, which is supplied with pressure by a pressure generator upstream of the unit. The pressure generator is particularly preferably another electrohydraulic unit or a brake pedal actuated pressure generator or a vacuum-assisted pressure generator.

The pressure medium reservoir is preferably supplied with pressure medium via a pressure medium container.

The pressure medium reservoir preferably comprises a supporting body which is particularly preferably made of metal, and a medical separating element which delimits a ventilated space with the supporting body. The support body allows the additional flow of air into the room when the pressure medium reservoir pressure medium volume is withdrawn.

The pressure medium reservoir is preferably designed as bellows reservoir with a media separating element made of elastomer, which by deformation of the media separating element within the

Support body provides the required pressure medium volume. Particularly preferably, the media separating element moves by its own material tensions back to its original position as soon as there is no more suction.

Alternatively, it is preferred that the pressure medium reservoir is designed as a piston accumulator. Preferably, the accumulator or the pressure with ^¬ telreservoir comprises an elastic element, eg a spring, which exerts a restoring effect on the volume limiting media separating element of the pressure medium reservoir. The elastic element (eg spring) presses the media separating element (eg the Piston) preferably from the hydraulic unit, so that the media separating element pushes the air volume back into the electronic unit. Sealing elements on the media separating element (eg the piston) are designed in such a way that they allow a slight push back in unpressurized operation, but can withstand pressure when pressurized from the hydraulic range, but absorb little volume.

Preferably, a sponge-like element is arranged in the region outside of the pressure medium reservoir, that austre ^¬ tende pressure medium leaks can be absorbed. The sponge-like element or elements is / are particularly preferably arranged around the means for aeration (eg opening 34) in the intermediate region between the hydraulic unit and the electronic unit.

Preferably, the aggregate comprises an electronic

Sensing device or detection device that can be used to monitor the level or at least the "filled" state of the pressure fluid reservoir or pressure medium reservoir.

Preferably, the in the one or more pressure medium storing reservoired pressure fluid volume dimensioned such that exists for at least one braking in the associated brake circuit from reaching ^¬ pressure fluid volume. Thus, for example, even with a burst brake line, which is located in the access path of the unit, still be carried out a braking. LIST OF REFERENCE NUMBERS

1, 1 ^λ , 1 ^{λ λ} electro-hydraulic unit

2 master brake cylinders

3 brake actuator

4a, 4b pressure fluid reservoir

5 brake actuator

6 simulator

7 way detection device

8 signal line

9 electrical system plug

10, 10 10 ^{λ λ} hydraulic unit (HCU)

11 receiving body

12a, 12b, 12c valve

13 pump

14 drive device

15 pressure sensor

16a, 16b brake line

17 return line

18 low-pressure accumulators

19a, 19b suction line

20 electronics unit (ECU)

21 Housing of the electronics unit

22 interior

23 means of ventilation

24 circuit board

30, 30 30 ^{λ λ} accumulator

31 first chamber

32 second chamber

33, 33 33 ^{λ λ} media separating element

34 means of ventilation

35 detection device

36, 36 ^{λ λ} supporting body

37 first sensor element

38 second element ₂

wheel brake

pressure generator

Claims

Claims:

1. Electrohydraulic unit (1, 1 ^λ , 1 ^{λ λ} ) for a

Brake system comprising a hydraulic unit (10) comprising a receiving body (11) receiving electrically operable valves (12) and a hydraulic pump (13), with an electric drive device (14) for the pump, with an electronic unit arranged on the receiving body ( 20) for controlling the valves and / or the drive device, and having a pressure fluid reservoir (30, 30 30 ^{λ λ} ), a first space (31) for pressure medium, a ventilated second space (32) and a media separating element (33) the first space is separated from the second space comprises, wherein the pressure fluid accumulator is connected to a suction side of the pump, characterized in that the pressure fluid reservoir (30, 30 30 ^{λ λ} ) as a pressure medium ^¬ vorratsspeicher to hold pressure medium for the pump (13 ) is designed for a brake pressure build-up or during a brake pressure build-up by means of the pump.

2. Electrohydraulic unit according to claim 1, characterized in that the pressure fluid reservoir (30, 30 30 ^{λ λ} ) is filled in a quiescent state or an operational state of the electro-hydraulic unit with pressure medium.

3. Electro-hydraulic unit according to claim 1 or 2,

characterized in that the second space (32) via a means (34) for ventilation with an arranged between the receiving body (11) and a housing (21) of the electronic unit interior (22), in which in particular electrical and / or electronic components ( 24) are arranged on ^¬ connected. Electrohydraulic aggregate according to one of claims 1 to

3, characterized in that the air-filled volume of the inner space (22) is a multiple, in particular more than ten times, the volume of the first space (31).

Electrohydraulic aggregate according to one of claims 1 to

4, characterized in that in the housing (21) of the electronic unit (20) comprises means (23) for ventilating the interior (22) of the electronic unit (20) is provided which comprises in particular at least one gas-permeable, and in particular liquid-tight, membrane element.

Electrohydraulic aggregate according to one of claims 1 to

5, characterized in that the pressure medium accumulator is designed such that the pressure fluid accumulator (30, 30 ^{λ λ} ) self-refilled after the

Pressure medium accumulator pressure medium was removed.

Electrohydraulic aggregate according to one of claims 1 to

6, characterized in that a pressure medium ^¬ absorbing, especially a sponge-like, element in the region of the pressure medium reservoir (30, 30 30 ^{λ λ} ), in particular ^¬ special in a region around the means (34) for ventilation, is provided.

Electrohydraulic aggregate according to one of claims 1 to

7, characterized in that a detection device (35) for detecting or monitoring a level of the pressure medium reservoir (30 ^{λ λ} ) is provided, which in ^¬ particular in a region between the receiving body (11) and the housing (21) of the electronic unit (20 ) is arranged.

9. Electro-hydraulic unit according to claim 8, characterized in that the detection device is a first Sensor element (37) which is arranged in the electronic unit (20), and a second element (38) which is positioned on the medium separating element (33 ^{λ λ} ) comprises.

Electrohydraulic unit according to one of claims 1 to 9, characterized in that the pressure fluid reservoir (30, 30 ^{λ λ} ) is designed as a bellows storage, a support body (36, 36 ^{λ λ} ), in particular of metal, and an elastic media separating element (33 , 33 ^{λ λ} ), wherein the support body and the elastic media separating element define the second space (32).

Electrohydraulic unit according to one of claims 1 to 9, characterized in that the pressure fluid reservoir (30 ^λ ) is designed as a piston accumulator with a piston as a media separating element (33 ^λ ).

12. brake system for a motorcycle or a motor vehicle, with a brake actuator (3, 5) and with hydraulically actuated wheel brakes (40a, 40b), characterized in that this electrohydraulic unit (1, 1 ^λ , 1 ^{λ λ} ) according to one of Claims 1 to 11, to which at least one of the wheel brakes is connected. 13. Brake system according to claim 12, characterized in that the pressure fluid reservoir (30, 30 30 ^{λ λ} ) is designed such that the ready in the accumulator pressure medium volume for actuating the wheel brake or the wheel brakes, which is or are connected to the accumulator for Overcoming a clearance and for ^¬ leadership of a service brake on the wheel or the wheel brakes sufficient.

14. Brake system according to claim 12 or 13, characterized in that this one associated with atmospheric pressure Pressure medium reservoir (4a, 4b) includes, which is connected or connectable to the pressure fluid reservoir.

Brake system according to one of claims 12 to 14, characterized in that it comprises a pressure generator (50), in particular a actuatable by means of the actuating element master cylinder or an electrically controllable pressure generator or a vacuum activatable pressure generator, with at least one pressure output terminal, wherein the pressure output port connected to the, in particular high-pressure ^{resistant, ¬} pressure ^accumulator connected or connectable.