Brake system for a commercial vehicle, compressed air production unit and use of a compressed air production unit
阅读说明:本技术 用于商用车的制动设备、压缩空气制备单元和压缩空气制备单元的使用 (Brake system for a commercial vehicle, compressed air production unit and use of a compressed air production unit ) 是由 S·黑尔 于 2019-01-24 设计创作,主要内容包括:本发明涉及一种用于商用车的电子气动制动设备(1)。所述制动设备(1)具有制动控制模块(8),借助所述制动控制模块能够产生用于行车制动缸(6)的制动压力,所述行车制动缸能够配属于车轴的单个车轮或多个车轮。根据本发明实现对制动控制模块(8)的冗余的压缩空气供给,其中,这些制动控制模块不但与压缩空气储存器(41、42)而且与备用压缩空气储存器(43)连接。(The invention relates to an electronic pneumatic brake system (1) for a commercial vehicle. The brake system (1) has a brake control module (8) by means of which a brake pressure can be generated for service brake cylinders (6) which can be associated with a single wheel or with a plurality of wheels of an axle. According to the invention, redundant compressed air supply to brake control modules (8) is achieved, wherein said brake control modules are connected both to compressed air reservoirs (41, 42) and to a backup compressed air reservoir (43).)
1. An electro-pneumatic brake system (1) for a utility vehicle, having:
a) a first brake control module (8a) by means of which a brake pressure for a service brake cylinder (6a) of a wheel or a service brake cylinder of at least one axle is generated,
b) a second brake control module (8b) by means of which a brake pressure for a service brake cylinder (6b) of at least one wheel or a brake pressure for a service brake cylinder of at least one axle is generated,
c) wherein the brake control module (8a) is connected both to a compressed air reservoir (41) and to a standby compressed air reservoir (43),
it is characterized in that the preparation method is characterized in that,
d) both the first brake control module (8a) and the second brake control module (8b) are connected to the reserve compressed air reservoir (43) or to a reserve compressed air reservoir.
2. The brake apparatus (1) as claimed in claim 1, characterized in that the supply of compressed air by the compressed air reservoir (41, 42) is effected by a safety valve (83).
3. A brake device (1) according to one of the preceding claims, characterized in that the brake control module (8) has a first input interface (44) and a second input interface (45), respectively, wherein,
a) the first input connection (44) and the second input connection (45) open into a common inlet line (48) of the associated brake control module (8), but are preferably blocked relative to one another,
b) the first input connections (44) are each connected to an associated compressed air reservoir (41, 42) and
c) the second input interface (45) is connected to the standby gas reservoir (43).
4. A braking device (1) according to any of the preceding claims, characterized in that the braking device (1) has a compressed air preparation unit (2) which:
a) having a pressure regulator, an air dryer (15) and at least one circuit protection valve (25), and
b) at least one compressed air storage (41, 42) and/or the spare compressed air storage (43) is/are supplied with compressed air.
5. A brake arrangement (1) according to any one of the preceding claims, characterized in that in the brake control module (8),
a) an inlet line or the inlet line (48) is connected to an outlet connection (49) for at least one service brake cylinder (6) via a solenoid valve (50), and
b) the exhaust unit (52) or the exhaust port is connected to the output port (49) via a solenoid valve (53).
6. A brake apparatus (1) according to one of claims 1 to 4, characterized in that in the brake control module (8) one input line or the input line (48) is connected with an output interface (49) for at least one service brake cylinder (6) by a combination of a two-position three-way solenoid valve (74) and a two-position two-way solenoid valve (75).
7. Brake system (1) according to one of claims 1 to 4, characterized in that in the brake control module (8) one inlet line or the inlet line (48) is connected via a relay valve (78) to an outlet connection (49) for at least one service brake cylinder (6), wherein a control connection (79) of the relay valve (78) is connected via a control connection (79) to the at least one service brake cylinder (6)
a) By a combination of a two-position three-way solenoid valve and a two-position two-way solenoid valve, or
b) Two-position two-way electromagnetic valve (76, 77)
Is inflated and deflated.
8. The braking device (1) according to any one of the preceding claims,
a) the compressed air reservoir (41) associated with the first brake control module (8a) forms a backup compressed air reservoir (43) for the second brake control module (8b), and
a) the compressed air accumulator (42) associated with the second brake control module (8b) forms a backup compressed air accumulator (43) for the first brake control module (8 a).
9. The braking device (1) according to any one of claims 4 to 8 when dependent on claim 3,
the output (24c) of the compressed air preparation unit (2) is connected to the second input (45) of the brake control module (8) and to the outputs (24b, 24d) which are connected to the first input (44) of the brake control module (8) via compressed air reservoirs (41, 42).
10. Braking device (1) according to any one of the preceding claims, characterized in that said reserve compressed air reservoir (43) is:
a) a compressed air reservoir of the air suspension circuit (34);
b) a compressed air reservoir of the trailer brake circuit (38);
c) a compressed air reservoir of the parking brake circuit (39); and/or
d) A compressed air reservoir of the auxiliary consumer circuit (40).
11. A compressed air preparation unit (2) for a commercial vehicle, having:
a) a pressure regulator;
b) an air dryer (15); and
c) outputs (24a, 24b, 24d, 24e, 24f, 24g) for at least two service brake circuits (35, 37), for an air suspension circuit (34), a trailer brake circuit (38), a spring accumulator brake circuit (39) and/or an auxiliary consumer circuit (40) (circuit protection valves),
it is characterized in that the preparation method is characterized in that,
d) there is an additional output (24c) for the backup loop (36).
12. Compressed air preparation unit (2) according to claim 11, characterized in that an additional output (24c) for the backup circuit (36) branches off directly from the central circuit (20) via a circuit line (23 c).
13. Compressed air preparation unit (2) according to claim 11, characterized in that the additional outlet (24c) for the backup circuit (36) is connected via an associated circuit line (23c) and at least one branch line (66, 67) to circuit lines (23b, 23d) for further consumer circuits.
14. Use of a compressed air preparation unit (2) according to any one of claims 11 to 13 for a brake apparatus according to any one of claims 1 to 10.
Technical Field
The invention relates to a brake system for a commercial vehicle. In this brake system, the two brake pressures for two service brake cylinders or two groups of service cylinders, which are assigned to different axles or service brake cylinder circuits in particular, are electronically controlled, regulated or influenced by two brake control modules, which are assigned to one service brake cylinder or one group of service brake cylinders respectively (wherein, however, there may also be more than two brake control modules with assigned further service brake cylinders or service brake cylinder groups). The invention further relates to a compressed air preparation unit for a commercial vehicle. Finally, the invention relates to a new use of a compressed air preparation unit.
Background
WO 2017/060128 a1 discloses a brake system in which the brake pressure for the service brake cylinders of the rear axle (optionally with an electronically regulated ABS pressure regulating valve connected in between) is generated by a single-channel pressure regulating module. The supply of compressed air to the supply connection of the single-channel pressure control module is provided by a supply tank, which is additionally also used for the compressed air supply of the foot brake module. The single-channel pressure regulation module has a pneumatic control interface which is supplied with pneumatic brake pressure, which is output as a result of the actuation of the brake pedal by the driver, controlled by the service brake module. The single-channel pressure regulating module has a relay valve with an inlet/outlet valve actuated by a relay piston, which produces a brake pressure to be supplied to the service brake cylinder as a function of a control pressure acting on the relay piston. In the case of an intact control unit of the electrical power supply and of the single-channel pressure regulating module, the control pressure of the relay valve is predefined by two solenoid valves which are actuated by the control unit. The solenoid valve is designed as a shut-off valve and assumes its shut-off position without being energized. In order to increase the pressure of the control pressure at the control interface of the relay valve, the solenoid valve connects the control interface to the reserve interface, and in order to reduce the control pressure at the control interface of the relay valve, a further solenoid valve connects the control interface of the relay valve to the exhaust. In order to regulate the solenoid valves, the control pressure of the relay valves and thus the brake pressure for the service brake cylinders, which is output in a controlled manner, by the control unit, the control unit is supplied with electrical control signals of the service brake module, which correspond to the actuation of the brake pedal, by an electrical control interface of the single-channel pressure regulating module. In the event of a failure of the electrical power supply or of an insufficient function of the control unit, the solenoid valve assumes its blocking position, so that the control interface of the relay valve is blocked both with respect to the reservoir and with respect to the exhaust. In this case, however, the auxiliary solenoid valve, which is likewise designed as a shut-off valve, assumes the flow-through position, which results in the pneumatic control interface of the single-channel pressure regulating module, which is connected to the service brake module, being connected to the control interface of the relay valve. In this standby operating state, the relay valve is controlled by the driver actuating the brake pedal of the service brake module and thus by the pneumatic control pressure generated by the service brake module, and the pressure for the service brake cylinder is thus predefined. The brake system known from WO 2017/060128 a1 also has a single-channel pressure control module for generating the brake pressure for the service brake cylinders of the front axle. The single-channel pressure regulating module for the front axle is basically designed correspondingly to the single-channel pressure regulating module for the rear axle explained above. However, the compressed air supply of the storage connection of the single-channel pressure control module of the front axle is effected in parallel via a first line branch having a check valve and a storage tank and a second line branch having a check valve and a further storage tank and also responsible for the compressed air supply of the auxiliary consumer circuit (here an air suspension circuit). The two single-channel pressure control modules for the front axle and the rear axle together form a structural unit, i.e. a two-channel pressure control module. By means of two separate control units of the two single-channel pressure control modules, the different brake pressures of the service brake cylinder of the front axle on the one hand and the service brake cylinder of the rear axle on the other hand can be controlled as a function of the desired axle load distribution by means of the control of the solenoid valves and thus of the control pressures of the relay valves. To enable regulation, the brake pressure output by the relay valve control may be sensed by a pressure sensor integrated into the single channel pressure regulation module and processed by the control unit.
WO 01/08953 a1 discloses a brake system of a commercial vehicle, in which a service brake cylinder of a rear axle of the commercial vehicle is actuated via an electronically regulated two-way pressure control module. The two-way pressure control module is supplied with compressed air from a reservoir tank, which is responsible only for the compressed air supply to the service brake cylinders of the rear axle. The service brake cylinders of the front axles of the commercial vehicles are each supplied with compressed air via an associated single-channel pressure control module. The single-channel pressure regulating module assigned to one of the vehicle sides of the front axle has a reservoir connection to a reservoir tank for the front axle. The single-channel pressure regulating module also has a control interface to which the pneumatic brake pressure actuated by the driver via the brake pedal is supplied. In the event of failure of the electronic pneumatic actuation of the brake pressure, the single-channel pressure regulating module transmits the pneumatic brake pressure supplied to the control interface to the service brake cylinder. The one-way pressure control module on the other vehicle side of the front axle also has a reserve connection and a control connection, with the output of the one-way pressure control module being connected to the associated service brake cylinder. However, with this single-channel pressure regulating module, the reserve connection is connected on the one hand via the switching valve to the reserve container of the front axle and on the other hand to the auxiliary reserve container. The connection of the switching valve to the storage tank of the front axle is preferably connected via the switching valve in such a way that the storage connection of the single-channel pressure control module is connected to the storage tank of the front axle without a pressure drop in the storage tank of the front axle due to leakage. The switching valve connects the single-channel pressure regulating module to the auxiliary reservoir only in the event of a leak. In addition, for the single-channel pressure regulation module, the control interface is connected to the auxiliary reservoir via a relay valve. The relay valve has a first active surface, which is acted upon by the pneumatic brake pressure actuated by the driver via the brake pedal, and an oppositely acting active surface, which is acted upon by the pneumatic brake pressure actuated by the trailer control valve.
WO 2010/094481 a2 discloses a dual-channel pressure control module, by means of which both the service brake of the front axle of the commercial vehicle and the service brake of the rear axle of the commercial vehicle are acted upon. The two-channel pressure control module has a reservoir connection to an associated reservoir tank and a control connection to which a pneumatic brake pressure predefined by the driver via a brake pedal is supplied, for each of the front axle and the rear axle.
Other prior art is known from WO 2008/025404 a 1.
Disclosure of Invention
The object of the present invention is to provide an electronic pneumatic brake system which, when the design effort is concerned, has increased vehicle operating safety and/or availability in the event of pneumatic leakage. The object of the invention is also to provide a correspondingly improved compressed air production unit and a new use of a compressed air production unit.
According to the invention, the object of the invention is achieved by means of the features of the independent claims. Further preferred embodiments according to the invention result from the dependent claims.
The invention relates to an electronic pneumatic brake system in which at least one electronic control unit generates or influences a brake pressure for a service brake cylinder by means of an electrically actuated valve on the basis of at least one electrical control signal. In this case, the brake pressure can be controlled or regulated (also referred to below as "control" for simplicity). The resulting level and/or profile of the brake pressure may, for example, take into account the following or be correlated with or correspond to the braking demand and/or braking signal:
a braking request predefined by the driver, in particular based on the direct generation of an electric braking signal by actuating a brake pedal by the driver; and/or
The braking signal generated automatically by the control unit on the basis of the operating variables, in particular on the basis of a collision avoidance system, a speed controller and/or an anti-slip system, such as an ABS or EBS control device.
It is within the scope of the present invention to use a brake control module. The brake control module is in particular an electronic brake control module having an electronic control unit, an input interface via which compressed air is supplied to the brake control module, and at least one solenoid valve controlled by the control unit, by means of which the compressed air acting at the input interface is converted into a brake pressure for a service brake cylinder on the basis of the control by the control unit. In this case, the control unit can determine a control signal for generating the brake pressure from the operating variable provided by the brake control module, and/or the control unit of the brake control module can be connected to other control units, in particular a central brake control unit, via a wired or wireless network, a bus system or a signal or data line and can receive a preset value or a variable for the brake pressure to be generated.
In the electro-pneumatic brake system according to the invention, a first brake control module is present. The brake pressure is generated, in particular controlled, by means of a first brake control module. The brake pressure can be determined, for example, for a service brake cylinder of only one wheel or of different wheels or for a service brake cylinder of one axle or of a plurality of axles forming a group.
Furthermore, the electronic pneumatic brake system according to the invention has a second brake control module, by means of which a brake pressure is likewise generated, which is then determined for the service brake cylinder(s) of the (further) wheel or for the service brake cylinder(s) of the (at least one (further) axle. The brake pressures generated by the two brake control modules can be temporarily or permanently the same or different from one another, for example as a function of static or dynamic wheel or axle load distribution and/or possible slip.
The brake control module according to the invention can be designed as a structural unit in each case or can be combined with further structural elements for further functions into a structural unit. It is also possible to combine two brake control modules into one structural unit. Preferably, the brake control module is arranged in the region of a wheel, wheel suspension, axle or axle suspension and is mounted on the vehicle chassis, axle or shaft, wheel suspension or axle suspension. The brake control module communicates pneumatically and electronically, for example via rigid or flexible lines or wirelessly, with other structural elements supported directly or indirectly on the vehicle chassis, while the pneumatic output of the brake control module is connected to the service brake cylinder, preferably via flexible lines or hoses.
In the electronic pneumatic brake system according to the invention, the brake control module is supplied with compressed air in a redundant manner by: the brake control module, in particular the input interface of the brake control module, is connected both to the compressed air reservoir and to the standby compressed air reservoir. Within the scope of the present invention, such a connection of the brake control module to the compressed air reservoir or the backup compressed air reservoir is to be understood as meaning not only a permanent pneumatic line connection but also any connection which, at least under selected operating conditions, enables the transfer of compressed air from the compressed air reservoir or the backup compressed air reservoir to the brake control module, in particular to the input interface of the brake control module. This includes embodiments in which, for normal operation, only a connection between the compressed air reservoir and the brake control module exists, while the connection between the backup compressed air reservoir and the brake control module is blocked, while, only in the backup case (in particular in the case of a leakage of the compressed air reservoir, of the lines arranged upstream of the compressed air reservoir or of the pneumatic components or lines arranged there or on the path of the compressed air from the compressed air reservoir to the brake control module), the connection between the backup compressed air reservoir and the brake control module is opened, while in this case the connection between the compressed air reservoir and the brake control module is blocked. However, it is also possible, at least temporarily and/or under selected operating conditions, to open or block the connection of both the compressed air reservoir and the brake control module and the connection of the backup compressed air reservoir to the brake control module. Furthermore, the compressed air of the compressed air reservoir or of the standby compressed air reservoir can act unaffected at the input of the brake control module. However, the invention also includes embodiments in which the pressure acting at the input interface of the brake control module has been influenced in that: for example, valves on the path from the compressed air reservoir or the reserve compressed air reservoir to the brake control module are electronically controlled, for example, in order to generate a brake pressure associated with a braking demand or a braking signal already at the input of the brake control module, which brake pressure is to be modified (in particular by means of modulation or anti-slip regulation) by the brake control module. Finally, the invention also includes embodiments in which passive components, such as pressure relief valves, overflow valves, etc., are arranged in the line connection between the compressed air reservoir or the backup compressed air reservoir and the brake control module.
The invention is based on the following recognition: in the case of known electropneumatic brake systems for commercial vehicles, it is a prejudice for the person skilled in the art that, in order to ensure the operational safety of the brake system, it is sufficient to ensure that, in the event of a leak in the brake system, at least a part of the service brakes of the commercial vehicle (for a limited number of brakes) remains operable, so that despite the leak the driver can still brake the vehicle with the remaining part of the service brakes available. In the case of the brake system described at the outset, this procedure of the person skilled in the art results in the brake control module in the commercial vehicle being supplied with compressed air redundantly both from the compressed air reservoir and from the backup compressed air reservoir, so that in the event of a leakage of the compressed air supplied from the compressed air reservoir, the compressed air supply and thus the operability of the brake control module and of the service brake cylinders associated with it is still ensured by the backup compressed air reservoir. The invention provides for the first time that the brake control modules are supplied in a redundant manner by means of a reserve compressed air reservoir, and that this applies to at least two brake control modules.
In addition, the invention does not use a separate backup compressed air reservoir for both brake control modules in order to ensure their operational capability even in the event of a leak. Instead, the reserve compressed air storage is used in a multifunctional manner by: the standby compressed air reservoir is connected both to the first brake control module and to the second brake control module. This results in a considerable reduction in the construction effort, since a plurality of spare compressed air reservoirs need not be used. In the event that this need not necessarily be the case, it may even be possible within the scope of the invention for the single reserve compressed air reservoir to be responsible for providing a reserve compressed air supply for more than two brake control modules.
To mention just a few examples encompassed by the invention, the first brake control module and the second brake control module (and possibly also further brake control modules) may each be assigned to a service brake cylinder of a wheel or to service brake cylinders of wheels or to a service brake cylinder of an axle or to service brake cylinders of axles. However, it is also possible to supply compressed air to a first brake control module, which is assigned to the service brake cylinders of the axle, by means of a backup compressed air reservoir, and to supply compressed air to a second brake control module and a third brake control module, which can each be assigned to the service brake cylinders of the wheels, by means of the backup compressed air reservoir. In particular, in the last-mentioned case, the first brake control module is a brake control module assigned to the middle or rear axle, while the second and third brake control modules are assigned to the front axle of the utility vehicle.
The compressed air storage or the standby compressed air storage according to the invention is in particular a container for storing compressed air previously supplied by a compressor of a utility vehicle. The compressed air storage device is preferably a compressed air container with a predetermined volume, in which compressed air provided by the compressed air preparation device via the circuit protection valve is stored in a predetermined pressure range. However, it is also possible in particular for the reserve compressed air reservoir to be provided by a line volume or a volume of a pneumatic component (for example an air suspension bellows). The invention also includes embodiments in which, in the standby state, not only is compressed air from a standby compressed air reservoir, which has been supplied previously by the compressor, used, but also in the standby state, a supplementary supply of compressed air into the standby compressed air reservoir is effected.
In a further development of the brake system according to the invention, a safety valve is arranged between the compressed air reservoir and the associated brake control module. In the event of a pressure drop in the compressed air reservoir (i.e. in the standby case, a leak in the compressed air reservoir itself or in a line or a pneumatic component connected thereto may lead to a pressure drop), the safety valve blocks the flow of compressed air from the brake control module to the compressed air reservoir, so that venting of the brake control module by way of a leak can be avoided. In the simplest case, a check valve is arranged upstream of the input interface of the brake control module, or the connection of the brake control module to the compressed air reservoir is effected via a directional control valve. However, in addition to the non-return valve or the reversing valve, any valve can be used, for example a switching valve as a safety valve, which switches the compressed air supply from the compressed air reservoir to the backup compressed air reservoir for a backup situation and/or desirably blocks a defective service brake circuit. Within the scope of the invention, the safety valve may be arranged upstream of the brake control module, i.e. between the brake control module and the compressed air reservoir. It is also possible within the scope of the invention to integrate the relief valve into the brake control module.
The input lines of the brake control module are connected both to the compressed air reservoir and to the standby compressed air reservoir, which is necessary for the redundant supply of compressed air to the brake control module via the compressed air reservoir on the one hand and via the standby compressed air reservoir on the other hand. It is therefore possible for the two supply lines of the compressed air reservoir and the reserve compressed air reservoir to be combined outside the brake control module via suitable pneumatic connection units, such as switching valves or other valves, to form a common supply line, which is then connected to the single supply interface of the brake control module. However, it is proposed in particular for the invention that the brake control module has a first input interface and a second input interface, respectively. The first and second input connections then open into a common input line of the associated brake control module within the brake control module (using suitable pneumatic combination units such as switching or reversing valves or possibly nodes with upstream check valves). The first input interfaces of the two brake control modules are then each connected to an associated compressed air reservoir. Conversely, the second input interfaces of the two brake control modules are then connected to the backup compressed air reservoir.
For example, in one embodiment of the invention, a compressed air reservoir, which is responsible for the compressed air supply of the brake control modules during normal operation, can be connected to the first input interfaces of the two brake control modules, while an additional backup compressed air reservoir is available for the backup compressed air supply to the two brake control modules. However, if an additional backup compressed air reservoir is to be avoided, it is also possible, in addition to the backup situation, for the compressed air reservoirs respectively responsible for the compressed air supply of the brake control modules to be used as backup compressed air reservoirs for the other brake control modules. In this configuration, the two compressed air reservoirs are therefore each connected to the first input interface of the associated brake control module and to the second input interface of the other brake control module.
In a further embodiment of the invention, the brake system has a compressed air preparation unit. The compressed air preparation unit has a pressure regulator, an air dryer and at least one circuit protection valve, wherein the compressed air preparation unit is designed in particular according to legal requirements and is used to supply a plurality of consumer circuits with compressed air via a plurality of circuit protection valves and can be designed according to various prior art techniques. At least one compressed air reservoir and a backup compressed air reservoir are supplied with compressed air by means of a compressed air preparation unit.
In the context of the present invention, as also explained above, the brake pressure for at least one service brake cylinder is controlled, this being done by controlling the supply pressure acting in the supply line or by adapting the brake pressure acting in the supply line as a function of the braking demand or the braking signal. In the case of a design of at least one brake control module, in which the supply line is connected via a solenoid valve, in particular a two-position two-way valve, to an output connection of the brake control module, at least one service brake cylinder is connected to the output connection. If the solenoid valve is switched into the open position by means of the control unit of the brake control module, a further transmission of the pressure of the inlet line to the outlet connection takes place, so that a pressure increase at the outlet connection can be controlled. In addition, the brake control module has a solenoid valve which is actuated by the control unit and which is in particular also a two-position two-way valve or a shut-off valve. The output port is connected to the exhaust unit or the exhaust port via the additional solenoid valve. If the solenoid valve is switched into the open position, a venting of the output connection can be effected, which leads to a reduction of the brake pressure in the service brake cylinder. Depending on the operating state of the two solenoid valves, the brake pressure at the output connection can therefore be increased, decreased or maintained, so that the brake pressure in the service brake cylinder can be controlled (i.e. regulated).
In an alternative embodiment, in the brake control module, the supply line is connected to the output connection for the at least one service brake cylinder via a combination of a two-position three-way solenoid valve and a two-position two-way solenoid valve (connected in series in any desired sequence of solenoid valves). If the two-position two-way electromagnetic valve is transferred to a stop position state, the output interface can be blocked. Conversely, if the two-position two-way solenoid valve is transferred into its open position, the two-position three-way solenoid valve can connect the inlet line to the outlet port in the through-flow position, so that the service brake cylinder can be pressurized and the outlet port can be connected to the exhaust outlet or the exhaust port in the exhaust position.
For both alternatives, the solenoid valve is used for direct charging and discharging of the output port. In a further alternative, which is encompassed by the invention, the aforementioned alternative combination of two solenoid valves (parallel connection of a two-position two-way solenoid valve or series connection of a two-position three-way solenoid valve and a two-position two-way solenoid valve) acts on a control interface of a relay valve which is arranged in the brake control module and connects the inlet line to the outlet interface for the at least one service brake cylinder. In this case, solenoid valves are used for the pre-control of the charging and discharging of air via relay valves and the known air quantity intensification and control resulting therefrom.
In the case of the brake system according to the invention, the compressed air reservoir associated with the first brake control module forms a backup compressed air reservoir for the second brake control module, and the compressed air reservoir associated with the second brake control module forms a backup compressed air reservoir for the first brake control module. In this case, the supply line may branch off from the compressed air reservoir into two brake control modules.
It is further proposed for the invention that the compressed air preparation unit is connected (via a line connection with or without pneumatic components) to the second input interface of the brake control module and therefore the output for the compressed air supply is connected in the standby state to the output connected to the first input interface of the brake control module via the compressed air accumulator. Through which connection the compressed air from the compressed air reservoir can be used for the standby compressed air supply.
As a backup compressed air reservoir, for example, an additional compressed air reservoir can be provided which is used only for the backup compressed air supply. However, it is also possible for the backup compressed air reservoir to be used for other purposes and, for example, to be a compressed air reservoir of an air suspension circuit, a trailer brake circuit, a parking brake circuit or an auxiliary consumer circuit or other consumer circuits or even for other brake control modules.
A further solution to the object of the invention is a compressed air preparation unit for a commercial vehicle. The compressed air preparation unit has a pressure regulator, an air dryer and outputs for consumer circuits (in particular at least two service brake circuits, air suspension circuits, trailer brake circuits, spring accumulator brake circuits and/or auxiliary consumer circuits). It may be provided that at least one circuit protection valve is arranged upstream of the outlet, via which, for example:
-ensuring a minimum pressure in a consumer circuit arranged downstream;
-a predefined maximum pressure;
-enabling a lateral feed between the individual consumer circuits; and/or
-controlling the filling sequence.
In this respect, the compressed air preparation unit may correspond to a compressed air preparation unit known from the prior art. According to the invention, the compressed air preparation unit is equipped with an additional output to which a backup circuit can be connected, by means of which the aforementioned brake control module can be supplied with compressed air redundantly. In this case, the additional output is preferably connected to the input interfaces of the two brake control modules. On the other hand, no conventional consumer circuits (i.e. service brake circuit, air suspension circuit, trailer brake circuit, spring accumulator brake circuit and auxiliary consumer circuit) are connected to this additional output. A compressed air preparation unit equipped with such an additional output for the backup circuit can be advantageously used in a brake system as explained above.
In a further development of the compressed air preparation unit according to the invention, the additional outlet for the standby circuit branches off directly from the central line of the compressed air preparation unit via the circuit line.
In an alternative embodiment, the additional output for the backup circuit is connected to the circuit lines for the other consumer circuits, in particular to the circuit lines for the service brake circuit, via a circuit line associated with the additional output and at least one branch line. In this case, the branch line preferably branches off from the circuit line of the further consumer circuit downstream of the circuit protection valve of the circuit line. A pressure-proof check valve may be arranged in the branch line.
A further solution to the object of the invention is the use of a compressed air preparation unit of the type stated above with an additional output for a backup circuit for a brake system as described above.
Advantageous developments of the invention result from the claims, the description and the drawings. The advantages of the features and the combination of features described in the description are merely exemplary and can act alternatively or in superposition without the implementation of the embodiments according to the invention having to make said advantages mandatory. Accordingly, the following applies, without altering the subject matter of the appended claims, in the context of the disclosure of the original application and the patent: further features can be taken from the drawings, in particular from the geometry and relative dimensions of the various components shown relative to one another, their relative arrangement and effective connection. Combinations of features of different embodiments of the invention or of different claims can likewise deviate from the cited relations chosen for the claims and are inspired thereby. This also relates to features which are shown in the individual figures or are mentioned in the description of the figures. These features can also be combined with the features of different claims. The features set out in the claims for other embodiments of the invention can likewise be deleted.
The features mentioned in the claims and in the description with respect to their quantity are to be understood as meaning that there is precisely the stated quantity or a quantity which is greater than the stated quantity, without the adverb "at least" being used deliberately. For example, when a service brake module or a solenoid valve is mentioned, it is to be understood that there is exactly one service brake module or solenoid valve, two service brake modules or solenoid valves, or more service brake modules or solenoid valves. These features can be supplemented by other features or be unique features, the features constituting respective results.
Reference signs included in the claims do not limit the scope of the objects protected by the claims. Said reference signs have been included only for the purpose of making the claims easier to understand.
Drawings
The invention will be further elucidated and described below with reference to a preferred embodiment shown in the drawing.
Fig. 1 to 10 show various embodiments of a brake system with a compressed air preparation device and a brake control module.
In the figures, the same reference numerals are used for different exemplary embodiments or also for structural elements having the same or at least partially similar technical configuration and/or function in one exemplary embodiment. If structural elements are designated with the same reference numerals in one embodiment, these structural elements are distinguished from one another by supplementary letters a, b. In this case, reference is also made in the description to reference numerals without supplementary letters, wherein the description may then apply to the structural elements which are designated in their entirety by reference numerals (and distinguished in the figures by supplementary letters). The individual components of one embodiment can also be used in other illustrated and described embodiments of the brake system, as required and as intended, wherein these components can be used instead of or in addition to the components shown in the other embodiments of the brake system.
Detailed Description
The brake system 1 according to fig. 1 has a compressed
The compressed
The compressed
The compressed air delivered by the
For the exemplary embodiment shown in fig. 1, the circuit protection valve 25 is designed as a passive valve, the operating state of which depends only on the pressure in the circuit line 23 on the input side and/or on the output side of the circuit protection valve 25. However, in contrast to the embodiment shown, an electropneumatically pre-controlled circuit protection valve 25 can also be used in the circuit line 23, and/or the circuit protection valve 25 can be electronically controlled directly by the control unit 9, as is known from various documents of the prior art for compressed
For the embodiment shown, the circuit protection valve 25 is configured as a relief valve with limited backflow. The pressure sensors 10a, 10b, 10c, 10d are connected to the circuit lines 23b, 23c, 23d, and 23e through branch lines.
In particular, a common pressure-limiting valve 32 is arranged upstream of the circuit lines 23e, 23f, 23 g. Furthermore, the same circuit protection valve 25e, f is used for the circuit lines 23e, 23f, wherein a check valve 33 is arranged in the circuit line 23f downstream of the circuit protection valve 25e, f.
The safety valve 21 is bypassed by a bypass line 26, in which a regeneration valve 27 and a pneumatic throttle 28 are arranged in series. For the embodiment shown, the regeneration valve 27 is designed as a pneumatically actuated two-position two-way valve or shut-off valve which assumes its shut-off position without the application of a control pressure.
The solenoid valves 11a, 11b are designed as two-position three-way valves, wherein the inlet connections of the solenoid valves 11a, 11b are supplied with compressed air via branch lines branching off from the central line 20, and the outlet connections of the solenoid valves 11a, 11b are each connected to an outlet 29 of the compressed
The compressed
During this so-called load phase, by means of which a first charging can take place when the commercial vehicle is started up or also a refilling can take place after a drop in operating pressure in the consumer circuit during operation of the commercial vehicle, the solenoid valve 11b is in the venting position, so that the regeneration valve 27 assumes its blocking position.
The switching from load operation to regeneration operation is effected by switching the solenoid valves 11a, 11b so that both solenoid valves assume their charge state. The pressure application to the control line 30 causes the
An
The
The
The brake control module 8 has an output connection 49, which is connected to the associated service brake cylinder 6 or to a service brake chamber of the combined spring brake cylinder 7.
The
The pressure at the output interface 49 is sensed by a pressure sensor 54 integrated into the brake control module 8, whereby the brake pressure can also be regulated.
The brake control modules 8 each have an electronic control unit 55 integrated into them. The control unit 55 receives control signals from the central
The
The operation of the brake system 1 is as follows: if the consumer circuit is charged as a result of a known operation of the
The backup compressed
If a leak occurs in the
In the case of a different design of the circuit protection valve 25, of the opening pressure of the circuit protection valve 25 and/or of the closing pressure of the circuit protection valve 25 and/or of the different opening pressures of the
A backup situation occurs in particular when a leak is present in the
In the exemplary embodiment shown in fig. 1, each
In fig. 1, only the compressed air supply to the brake control module 8 is designed redundantly. Additionally, the control lines 56a, 56b may also be designed in a redundant manner. In this case, redundant brake control units 5a, 5b can also be used, wherein it is also possible to use the control unit 9 of the compressed air preparation unit 2 (or a further, but multifunctional control unit) as a backup control unit for the
The foregoing applies substantially correspondingly to the following embodiments, provided that no further statements are made:
fig. 2 shows an embodiment in which four
According to fig. 3, six
In this case, the
As explained with regard to fig. 2, the
Fig. 4 shows an exemplary embodiment in which the
In the brake
The
In contrast to the compressed
For the embodiment according to fig. 6, the compressed
According to fig. 6, instead of the
The corresponding situation applies when there is a leak in the second
According to fig. 7, the brake control module 8 is constructed differently from the above-described embodiment in that: the inputs 44, 45 do not only open into the
The compressed
Finally, according to fig. 7, the
The exemplary embodiment of the brake system 1 shown in fig. 8 corresponds to the exemplary embodiment according to fig. 5, with the exception of the configuration of the brake control module 8. In the brake control module 8, the
The brake system 1 according to fig. 9 corresponds to the brake system 1 according to fig. 6, with the exception of the design of the brake control module 8. Unlike the previous embodiments, the solenoid valves 50, 53 or 74, 75 that control the output brake pressure are not used directly in the brake control module 8. Instead, the solenoid valves 76, 77 are used here for the pre-control of the relay valve 78. For the embodiment shown here, the solenoid valves 76, 77 are each designed as two-position two-way solenoid valves, which preferably assume their blocking position without being energized. In this case, the solenoid valve 76 is arranged between the
In contrast to the embodiment shown in fig. 9, it is alternatively also possible to realize the pre-control of the relay valve 78 by means of solenoid valves arranged in series, which can be a two-position three-way solenoid valve and a two-position two-way solenoid valve (in any order). Such a brake control module 8 can also be used in a brake system 1 according to one of the other figures.
The brake system 1 according to fig. 10 corresponds to the brake system 1 according to fig. 7, except for the differences explained below:
according to fig. 10, the
Furthermore, the
As a further optional difference, in fig. 10, the brake control module 8 is configured differently from the brake control module 8 according to fig. 7 as follows: the
In the exemplary embodiment shown, the safety valve 83 is designed as a
With the configuration according to the invention, the brake control module 8 is connected to the two outputs 24 of the compressed
List of reference numerals
1 brake device
2 compressed air preparation unit
3 brake signal generator
4 brake pedal
5 brake control unit
6 driving brake cylinder
7 combined spring energy-storing brake cylinder
8 braking control module
9 control unit
10 pressure sensor
11 solenoid valve
12 input interface
13 compressor
14 input pipeline
15 air dryer
16 exhaust part
17 exhaust branch
18 safety valve
19 stop valve
20 center line
21 safety valve
22 check valve
23 loop pipe
24 output terminal
25-loop protection valve
26 bypass line
27 regeneration valve
28 flow controller
29 exhaust part
30 control circuit
31 control circuit
32 pressure limiting valve
33 check valve
34 air suspension circuit
35 service brake circuit
36 backup circuit
37 service brake circuit
38 trailer brake circuit
39 spring energy-storage brake circuit
40 auxiliary consumer circuit
41 compressed air storage
42 compressed air storage
43 Standby compressed gas Container
44 input interface
45 input interface
46 check valve
47 check valve
48 input pipeline
49 output interface
50 solenoid valve
51 exhaust branch
52 exhaust part
53 solenoid valve
54 pressure sensor
55 control unit
56 control circuit
57 supply line
58 supply line
59 supply line branch
60 supply line branch
61 supply line branch
62 supply line branch
63 supply line branch
64 supply line branch
65 brake control module unit
66 branch pipelines
67 branch pipeline
68 check valve
69 check valve
70 switching valve
71 supply line
72 supply line branch
73 supply line branch
74 solenoid valve
75 solenoid valve
76 solenoid valve
77 electromagnetic valve
78 relay valve
79 control interface
80 branch pipeline
81 branch pipeline
82 switching valve
83 safety valve
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