Valve arrangement, actuator device and method for controlling a valve arrangement

Abstract

The invention relates to a valve arrangement and a method for controlling a valve arrangement comprising a 2 / 2-way proportional valve and a switching valve. The valve arrangement receives a single control signal and generates individual control signals for the individual valves of the valve arrangement from this control signal.

Description

[0001] The present invention relates to a valve arrangement, in particular a valve arrangement comprising a combination of a 2 / 2-way proportional valve and a switching valve. The present invention further relates to an actuator device, in particular a fluid-controlled actuator device, comprising such a valve arrangement. The present invention also relates to a method for controlling a valve arrangement.

[0002] Various types of valves can be used to control fluid flows, such as liquids or gases, especially compressed air. One type is the so-called switching valve. These switching valves typically have two defined states, for example, open or closed. The desired switch position can be signaled to the switching valve, for example, via a binary control signal.

[0003] On the other hand, so-called proportional valves are known. These proportional or continuous valves not only allow for discrete switch positions, such as fully open or closed, but also a continuous transition of the valve opening. The desired setpoint for the state of such a proportional valve can be signaled, for example, via an analog control signal in the form of a current or voltage value.

[0004] If a closed volume needs to be filled and emptied with a fluid in a controlled manner, this can be achieved, for example, using an arrangement with two valves. A first valve can be positioned between a fluid source and the volume. Opening this first valve allows the fluid to be released from the source into the volume in a controlled manner. A second valve can be positioned between the volume and an outlet. Controlling this second valve allows the fluid to be released from the volume in a controlled manner.

[0005] A disadvantage of this arrangement, however, is that the two valves must be individually supplied with suitable control signals. For this purpose, an external control unit must generate and provide two separate, coordinated control signals for such an arrangement.

[0006] Therefore, there is a need for a cost-effective, reliable and easy-to-control valve arrangement with multiple valves, which makes it possible to control the multiple valves individually based on a single signal or a single specification.

[0007] The present invention provides a valve arrangement, an actuator device, and a method for controlling a valve arrangement with the features of the independent claims. Further advantageous embodiments are the subject of the dependent claims.

[0008] According to a first aspect, a valve arrangement is provided. The valve arrangement comprises a 2 / 2-way proportional valve, a switching valve, and a control device. The 2 / 2-way proportional valve is connected to an application port at one port. The switching valve is also connected to the application port at one port. The control device comprises a setpoint interface, a first control interface, and a second control interface. The setpoint interface is designed to receive a setpoint, in particular a control signal for a setpoint. The first control interface is designed to output a first control signal. The first control signal is particularly suitable for controlling the 2 / 2-way proportional valve. The second control interface is designed to output a second control signal for controlling the switching valve.The control unit is further designed to generate the first control signal for controlling the 2 / 2-way proportional valve and the second control signal for controlling the switching valve using the same received setpoint or the same control signal for the setpoint.

[0009] According to another aspect, an actuator device, in particular a fluid-controlled actuator device, is provided. The actuator device comprises at least one actuator and a valve arrangement, as described above. The actuator device or the actuator is designed to actuate the valve arrangement. Actuation can be achieved, in particular, by means of a fluid flow and / or pressure of the fluid, which actuates the valve arrangement. The application port of the valve arrangement is coupled to a fluid port of the at least one actuator. In particular, the application port of the valve arrangement and the fluid port of the actuator are coupled to each other in such a way that fluid exchange is possible. The actuator device can be designed for different applications, for example, for gripping tasks, for filling and / or emptying tasks.

[0010] According to yet another aspect, a method for controlling a valve arrangement—as described above or below—is provided. The valve arrangement can, in particular, be a valve arrangement with a 2 / 2-way proportional valve and a switching valve. The 2 / 2-way proportional valve can be connected to an application port at one of its ports. Furthermore, the switching valve can also be connected to the application port at one of its ports. In particular, the valve arrangement can be a valve arrangement according to the first aspect. The method includes a step for receiving a setpoint or a control signal for a setpoint. Furthermore, the method includes a step for determining a first control signal for controlling the 2 / 2-way proportional valve. The first control signal can, in particular, be determined using the received setpoint or control signal for the setpoint.The method further includes a step for determining a second control signal for controlling the switching valve. This second control signal can be determined, in particular, using the received setpoint or control signal for the setpoint. The first control signal for controlling the 2 / 2-way proportional valve and the second control signal for controlling the switching valve can be generated using the same received setpoint or control signal for the setpoint. Finally, the method includes a step for outputting the first control signal to the 2 / 2-way proportional valve and the second control signal to the switching valve.

[0011] The present invention is based on the understanding that, for example, to actuate an actuator using a fluid flow or fluid pressure, both the fluid inflow and outflow must be controlled. This can be achieved either by using complex and costly 3 / 2-way valve arrangements, or alternatively, by using valve arrangements with several separate 2 / 2-way valves. However, valve arrangements with several separate 2 / 2-way valves (which may be combined with a switching valve) require precisely coordinated control of all the valves involved. In particular, a separate, individual control signal must be provided for each valve involved.Therefore, when using such valve arrangements, it is insufficient for a higher-level external control device to simply transmit a single control signal with a setpoint for the actuator to be operated to the valve arrangement. Instead, the higher-level control device must generate an individual control signal for each valve involved. For this purpose, the higher-level external control device must be individually configured according to the system properties of all valves, depending on the valve arrangement used. This places high demands on the higher-level external control device and, moreover, requires individual configuration, which typically has to be performed manually by a user before commissioning, depending on the valve arrangement used.

[0012] Based on this, the present invention aims to provide a concept for a simple, reliable, and cost-effective valve arrangement that enables the control of fluid flow inflow and outflow based on a single control signal or setpoint. To this end, a valve arrangement is provided that allows multiple valves to be controlled based on a single control signal. The individual valves of such an arrangement can be configured differently. In particular, proportional valves and switching valves can be combined in such arrangements. A key feature of these valve arrangements is that an individual control signal is generated and provided for each valve based on a single received control signal.

[0013] The control signal for such a valve arrangement can be any suitable type of signaling, for example, a signal specifying a setpoint. The control signal can, in principle, be provided in any way. For example, the control signal can be provided in the form of an analog signal, such as a voltage or current signal, particularly an analog signal within a predefined range of values. Alternatively, the control signal can also be transmitted in the form of a digital signal, for example, by transmitting a digital value with one or more bytes. In particular, such a digital signal can be transmitted, for example, via a suitable bus system or similar.

[0014] The setpoint, which can be provided, in particular, at the valve assembly, can in principle refer to at least one suitable parameter that characterizes the function (open / close) and / or the state (partially or fully open or partially or fully closed) of at least one valve of the valve assembly, and preferably all valves of the valve assembly – in particular the 2 / 2-way proportional valve and the switching valve. For example, such a setpoint can specify a pressure or flow rate of a fluid that is to be set by the valve assembly. However, setpoints relating to other parameters connected with the fluid controlled by the valve assembly are also possible in principle. For example, if an actuator is to be actuated by the fluid, the provided setpoint can also refer to a state of this actuator.In this case, the valve arrangement, in particular the control device of the valve arrangement, can convert this setpoint into corresponding parameters for the fluid, for example a pressure or a volume flow rate of the fluid.

[0015] Preferably, the setpoint includes a specification for at least one parameter of the entire valve arrangement, comprising at least two valves of different types. Alternatively, the setpoint includes a specification for an actuator device operated by the valve arrangement.

[0016] The setpoint interface can be configured to receive a control signal for a setpoint. The term "control signal for a setpoint" can be understood as a control signal that represents or encodes a setpoint. The setpoint includes, in particular, a setting for all valves of the valve assembly and / or a setting for the valve assembly itself and / or a setting for the actuator device that is operated by the valve assembly (e.g., a setting for a gripper).

[0017] The valve arrangement can comprise at least two valves, in particular at least two different valves, i.e., different valve types. The valve arrangement can thus, for example, be composed of different valve types and can, in particular, comprise a combination of a switching valve, especially a high-speed switching valve, and a proportional valve, especially a 2 / 2-way proportional valve. A switching valve is understood here to be a valve that can be switched between two discrete states. For example, a switching valve can be switched between an open state and a closed state. In the open state, a fluid can flow largely unimpeded between the two ports of the valve. In the closed state, the fluid flow between the two ports of the valve can be interrupted.To control such a switching valve, a binary control signal, in the form of a suitable voltage or current signal, can be provided to the valve. If the control signal is within a first value range, the switching valve assumes a first state, for example, closed. If the control signal is within a second value range, the switching valve assumes a second state, for example, open. However, switching valves that toggle between two states each time a predetermined control signal is applied are also conceivable.

[0018] A proportional valve within the meaning of the present invention is understood to be a valve that allows not only two discrete switch positions, but also a continuous transition between a fully closed state and a fully open state. The desired state of such a proportional valve can be signaled, for example, by a suitable control signal, such as an analog control signal in the form of a current or voltage value. A 2 / 2-way proportional valve has only two connections, for example, an inlet and an outlet.

[0019] The valve arrangement can be designed for any technical application. For example, the valve arrangement can include a combination of a 2 / 2-way proportional pressure control valve and a switching valve. Venting can be performed, for example, by the proportional valve. A switching valve can be used for purging. The reverse use of the two valve types for the two tasks is also possible. The control system is designed to prevent overshoot during venting. Both valves are connected to the customer's control system via an interface, specifically the setpoint interface.

[0020] The combination of a proportional venting function and an unregulated venting function offers several advantages. For example, costs are saved by eliminating the need for a second proportional valve for venting (eliminating the need for a piezoelectric actuator or, for example, a proportional solenoid). Furthermore, the more compact design of a switching valve results in a smaller installation space. Venting is ensured in the de-energized state by the use of a normally open (NO) valve.

[0021] The embodiment described above combines a venting proportional valve with a venting switching valve. While it is likely that in practice venting will often be achieved via the proportional function, an alternative embodiment allows for venting via a switching valve and venting via a proportional valve.

[0022] The control unit of the valve assembly is designed to generate an individual control signal for each valve in the assembly from the received control signal for the setpoint. These individual control signals can then be provided to the individual valves in a suitable manner. For this purpose, the control unit can, for example, comprise a suitable electronic circuit in the form of discrete components such as resistors, capacitors, transistors, integrated circuits, or similar devices. Alternatively, the control unit can also be implemented, at least partially, by a microcontroller or similar device. In this case, for example, code for a computer program can be stored in a memory communicatively linked to the microcontroller, which then instructs the microcontroller to execute the necessary processing steps.

[0023] According to one embodiment, the control signal for the setpoint can comprise an analog voltage or current signal. For example, the setpoint can be signaled by a control signal as a voltage signal within a predefined range, for example, between 0 and 5 V, 0 and 10 V, 0 and 12 V, preferably between 0 and 10 V, or another suitable range. Alternatively, the setpoint can also be signaled, for example, by a current signal, for example, in a range between 4 and 20 mA. In this way, the respective setpoint can be signaled by such an analog signal by means of a suitable mapping between the range of the control signal and a range of the setpoint of the valve arrangement, in particular the control unit. Alternatively, however, it is also possible to provide the setpoint to the control unit of the valve arrangement by means of suitable digital data transmission.For this purpose, a suitable bus system, such as a CAN bus or similar, can be used.

[0024] The control unit can be configured to calculate or generate a mapping between the received control signal and the respective, potentially multiple, control signals. This mapping can be understood as a conversion rule for transforming the (current and / or voltage) signal into a setpoint. The conversion rule can be defined via a user interface (UI) and / or be different for the respective setpoints of the individual valves in the valve assembly. The setpoint can define a target state for a valve in the valve assembly.

[0025] According to one embodiment, the control device is designed to actuate the switching valve if the control signal for the setpoint exceeds a first threshold. In this case, the control device can further be designed to actuate the 2 / 2-way proportional valve if the control signal for the setpoint exceeds a second threshold. In particular, the second threshold can be greater than the first threshold. With such a circuit concept, the switching valve is actuated, for example, by closing, when the first threshold is exceeded. Furthermore, if the control signal continues to rise above the second threshold, the other valve, in particular the 2 / 2-way proportional valve, can be actuated. Here, the proportional valve can be actuated depending on the current value signaled by the control signal.For example, a control signal can be provided to the proportional valve, which results from the difference between the current value of the control signal and an offset, such as the second threshold value. Such a concept thus makes it possible, for example, to generate a suitable control signal for both the switching valve and the proportional valve from a single control signal.

[0026] According to one embodiment, the 2 / 2-way proportional valve is arranged between a fluid inlet and the application port. Furthermore, the switching valve can be arranged between the application port and a fluid outlet. Such a configuration of the individual valves in the valve assembly allows, for example, the continuous adjustment of the fluid flow within the control range of the proportional valve. Furthermore, the switching valve at the fluid outlet can prevent or allow the fluid to flow out. In particular, the use of a switching valve at the fluid outlet enables a very rapid shut-off of the fluid when the switching valve opens.

[0027] According to one embodiment, the switching valve is designed as a normally open (NO) valve. Such an NO valve corresponds to a valve that is open without active control or control below a certain threshold. If an active control signal is applied to such an NO valve, it can switch to a closed or blocked state. By using such an NO valve, it can be ensured that even in the off state, for example, in the event of a fault due to a line break or similar, the valve switches to a defined state, thus establishing a safe operating condition for the valve assembly. For example, an NO valve at the fluid outlet can ensure that the valve allows fluid to flow out even when not controlled. This can prevent potentially hazardous operating conditions.Alternatively, depending on the application and configuration of the individual valves, an NC valve (normally closed valve) may also be used.

[0028] According to one embodiment, the valve arrangement includes a configuration device. The configuration device can be designed to set the first threshold and / or the second threshold and / or to define the conversion formula (in particular, an analog voltage or current control signal to a control signal). Such dynamic adjustment of the first and / or second threshold and / or the conversion formula allows the valve arrangement to be easily and efficiently adapted for different applications. For example, it is possible to adapt a given valve arrangement to different control signal sources by adjusting the thresholds for connection to the setpoint.In particular, this allows a valve assembly to be easily adapted for connection to different external sources, for example, from different manufacturers or different models from the same manufacturer. Furthermore, such a configuration device also makes it very easy to adapt the new valve assembly to the specific operating conditions when replacing it, for example, after a malfunction or similar event.

[0029] The configuration device can include, for example, switching elements such as DIP switches, bridgeable pins such as jumpers, or any other manually operable configuration elements. This allows a user to easily perform the respective configuration. In particular, when replacing a valve assembly, the user can easily see the configuration of the previous valve assembly and transfer it to the new one. However, the configuration can also be performed in any other way. For example, the configuration can also be done via digital communication. An additional configuration interface may be provided for this purpose. Alternatively, it is also conceivable to transfer the configuration or parameterization, for example, via the setpoint interface.For this purpose, the valve assembly, and in particular the control unit, can be put into a configuration mode, for example, by suitable measures such as actuating a switch or similar. The corresponding interface can then receive the configuration data and, for example, store it in non-volatile memory. Of course, any other suitable measures for configuration, especially of the first and / or second threshold, are also possible.

[0030] According to one embodiment, the valve assembly comprises at least one sensor. The sensor can be, for example, a pressure sensor and / or a temperature sensor. The sensor(s) can be designed to detect an operating parameter in the valve assembly. In this case, the control unit can, for example, be designed to adjust the actuation of the 2 / 2-way proportional valve and / or the switching valve using the detected operating parameters. Additionally or alternatively, the control unit can also be designed to detect a malfunction in the valve assembly using the sensor data provided by the sensor(s). In this way, the integration of the sensors and the evaluation of the sensor data can further optimize the operating behavior and reliability of the valve assembly.For example, by adjusting the characteristic curve of the proportional valve depending on the operating parameters, the pressure or flow rate of a fluid through the valve assembly can be adjusted. This allows, for example, fluctuations in pressure or flow rate to be compensated for, and thus the pressure or flow rate to be regulated according to the desired setpoint even under fluctuating conditions.

[0031] According to one embodiment, the application port is designed to be coupled to an actuator. Accordingly, the actuator can be controlled using a fluid supplied at the application port. The actuator can, in principle, be any actuator that can be operated using a fluid. For example, the actuator could be a holding element, a gripper, or similar device, in which pressure is to be exerted on a component to be held, etc., by means of the fluid, for example, compressed air. Furthermore, the actuator could, for example, be a metering device in which a substance to be metered is to be dispensed in a controlled manner by means of the fluid. It is understood, however, that in principle any other actuator is also possible, depending on the application.

[0032] The setpoint interface can be designed to receive data, in particular a control signal for a setpoint. Alternatively, the setpoint interface can be designed to output additional data, for example, for verification purposes. The setpoint interface can include a user interface, e.g., to adjust the control signal and / or the setpoint.

[0033] The control interface can comprise a first and a second part, namely a first and second control interface. The control interface can be configured to output data, in particular a first and second control signal for controlling the respective valve of the valve assembly. Alternatively, the control interface can be configured to additionally read data, for example, valve status data, to enable control of the valve of the valve assembly.

[0034] The above features, embodiments, and further developments can be combined with one another as appropriate (even if this is not explicitly mentioned). Further possible embodiments, further developments, and implementations of the invention also include combinations of features of the invention described previously or subsequently with regard to the exemplary embodiments, even if not explicitly mentioned. In particular, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention.

[0035] In particular, features of the method claims can be implemented and / or carried out by corresponding components of the control device, whereby these complement or extend its functionality and vice versa. Thus, the person skilled in the art will also consider aspects of the method claims for the control device.

[0036] The invention has been described above largely with reference to the device or valve arrangement. Features, advantages, or alternative embodiments mentioned therein are equally applicable to the other claimed subject matter—and in particular to the method—and vice versa. In other words, the present claims (which, for example, relate to a valve arrangement or an actuator device) can also be further developed with the features described or claimed in connection with the method, and vice versa. The corresponding functional features of the method are thereby realized by corresponding physical modules, in particular by hardware modules or microprocessor modules, of the system or product, and vice versa.The alternatives or embodiments of the invention described in connection with the method are not explicitly repeated for the device, but can also be applied within the device. In general, in computer science, a software implementation and a corresponding hardware implementation (e.g., as an embedded system) are equivalent. For example, a method step for "storing" data can be performed with a storage unit and corresponding instructions for writing data to the memory. To avoid redundancy, features or aspects of the device are therefore not explicitly described again, even though they can also be used in the alternative embodiments described in relation to the method. Basically, the claimed device is configured to perform the claimed method. Brief description of the characters

[0037] The following detailed description of the figures discusses exemplary embodiments, which are not to be understood as limiting, along with their features and further advantages, based on the drawing. This drawing shows: Fig. 1: a schematic representation of a block diagram of a valve arrangement according to an embodiment; Fig. 2: a schematic representation to illustrate the switching behavior of a valve arrangement according to one embodiment; Fig. 3: a schematic representation illustrating an actuator device with a valve arrangement according to one embodiment; Fig. 4: a schematic representation of a valve arrangement according to an embodiment in a first operating state; Fig. 5: a schematic representation of a valve arrangement according to one embodiment in a further operating state; and Fig. 6: a flowchart as it underlies a method for controlling a valve arrangement according to one embodiment.

[0038] The accompanying drawings are intended to provide a further understanding of the embodiments of the invention. They illustrate embodiments and, in conjunction with the description, serve to explain the principles and concepts of the invention. Other embodiments and many of the advantages mentioned will become apparent with reference to the drawings. The elements of the drawings are not necessarily shown to scale.

[0039] In the figures of the drawing, identical, functionally equivalent, and equally effective elements, features, and components – unless otherwise specified – are to be provided with the same reference symbols. Detailed description of the invention

[0040] Fig. Figure 1 shows a schematic block diagram illustrating the basic principle of a valve arrangement 1 according to one embodiment. The valve arrangement 1 comprises a control unit 10, a 2 / 2-way proportional valve 11, and a switching valve 12. Preferably, the control unit 10, the proportional valve 11, and the switching valve 12 of the valve arrangement 1 are designed as a single assembly.

[0041] The proportional valve 11 and the switching valve 12 can each be valves with two ports, for example, a fluid inlet and a fluid outlet. Depending on the application, the proportional valve 11, as well as the switching valve 12, are designed to control a corresponding fluid, for example, a liquid such as water, a hydraulic fluid, or similar, and / or a gaseous medium such as air, especially compressed air.

[0042] The switching valve 12 is capable of switching between a fully open state and a fully closed state. For this purpose, a corresponding control signal – in particular a second one – can be provided to the switching valve 12. This second control signal (hereinafter referred to simply as the control signal) can, for example, be a voltage- or current-controlled control signal. For instance, the switching valve 12 can assume a first switching state, such as open, if the control signal is below a predefined first threshold, for example, below a predefined first voltage or current value. Furthermore, the switching valve 12 can assume a second switching state, such as closed, if the control signal is above a predefined second threshold, for example, above a predefined second voltage or current value.There may be an undefined range between the first and second thresholds. However, it is also possible to define the same value for both the first and second thresholds.

[0043] The switching valve 12 could, for example, be a normally open (NO) valve. Such a valve is open as long as it is not actively controlled, i.e., as long as no control signal above a defined threshold value is present. Alternatively, the switching valve 12 could also be a normally closed (NC) valve, which is closed without active control.

[0044] In addition, depending on the application, switching valves are also possible which switch back and forth between an open and a closed state when a predefined switching pulse is applied (toggle valves).

[0045] The 2 / 2-way proportional valve 11 allows not only discrete states for full opening and full closing, but also a continuous transition of the valve opening. In this way, the flow rate of a fluid through such a proportional valve 11 can be adjusted within the available bandwidth of the proportional valve 11. For example, the opening degree of the proportional valve 11 can be adjusted depending on a control signal supplied to the proportional valve 11 – in particular, the first control signal. For instance, the opening degree of the proportional valve 11 can be varied depending on the voltage level or the current of an applied first control signal (hereinafter referred to simply as the control signal).For this purpose, a value range can be defined for the control signal, whereby the proportional valve 11 can be fully closed at one end of the value range and fully open at the other end. Between these values, the opening degree of the proportional valve can be varied linearly, logarithmically, exponentially, or according to any other characteristic curve, depending on the magnitude of the applied control signal.

[0046] The control device 10 can be coupled to an external signal source 2. For this purpose, the control device 10 can, for example, be provided with a setpoint interface 10a. Via this setpoint interface 10a, the control device 10 can, for example, receive specifications for a setpoint, in particular a control signal for a setpoint. This setpoint can be any quantity, in particular any quantity related to properties of a fluid flow through the valve arrangement 1. For example, the setpoint can be a quantity that specifies a pressure or volume flow rate for the fluid to be set by the valve arrangement 1.Optionally, the setpoint can also characterize a characteristic property of a component connected to the valve assembly, for example, an actuator or similar device, in particular a characteristic property that can be influenced by the fluid, for example, the pressure or the volumetric flow rate of the fluid. However, the setpoint provided to the control device 10 via a control signal can also, in principle, comprise any other property or parameter, in particular a property or parameter related to the fluid flowing through the valve assembly 10.

[0047] The setpoint can characterize the function and / or state of the valve arrangement 1. The setpoint can alternatively or cumulatively include a specification for the unit moved by means of the valve arrangement 1.

[0048] The setpoint can be signaled at the setpoint interface 10a of the control device 10 in any suitable manner. For example, the setpoint can be provided in the form of an analog signal, in particular an analog current or voltage signal. However, the setpoint can also be transmitted in the form of a digital control signal, for example, as a data element. A bus system, such as a CAN bus or similar, is possible for this purpose. Depending on the application, the setpoint can also be provided to the control device 10 in any other way.

[0049] The control device 10 further comprises a first control interface 10b and a second control interface 10c. The first control interface 10b can, for example, be coupled to the 2 / 2-way proportional valve 11. In this way, the control device 10 can provide a suitable control signal, for example in the form of a current or voltage signal, to the proportional valve 11. Similarly, the second control interface 10c can be coupled to the control valve 12. In this way, the control device 10 can also provide a suitable control signal, for example in the form of a current or voltage signal, to the control valve 12. The specific characteristics of the control signals for the proportional valve 11 and the control valve 12, as provided by the control device 10, can be adapted according to the specifications of the proportional valve 11 and the control valve 12.

[0050] The control device 10 is capable of processing the received control signal for the setpoint and generating the appropriate control signals for the proportional valve 11 and the switching valve 12. This makes it possible to control all valves, in particular the proportional valve 11 and the control valve 12, of the valve device 1 individually based on a single control signal, namely the control signal at the setpoint interface 10a. A possible concept for an embodiment for generating the control signal based on the setpoint specification is explained in more detail below.

[0051] The control device 10 can be implemented, for example, by an electronic circuit with discrete components, such as resistors, capacitors, diodes, transistors, integrated circuits, or similar components, integrated, for example, on a printed circuit board. Additionally or alternatively, the control device 10 can also include an application-specific integrated circuit, a microcontroller, or similar device to implement at least some of its functionalities. For this purpose, a memory can be provided, for example, containing program code that can be loaded and executed by a processor.

[0052] The control device 10 can preferably be mounted on the valve assembly. For example, the control device 10 can be located near the valves of the valve assembly or near the electrical connection of the valve assembly.

[0053] Fig. Figure 2 shows a schematic representation illustrating one way to convert the setpoint into control signals for the proportional valve 11 and the switching valve 12. In the lower section, reference numeral 110 represents the possible range of values ​​for the setpoint transmitted to the control device 10 via the control signal. Above this, reference numeral 112 represents the desired switching state or the corresponding control signal for the switching valve 12 for each setpoint. As can be seen, the state of the switching valve 12 changes at a setpoint value x. Below this value x, the switching valve 12 is in a first state, for example, open. Above the value x, the switching valve 12 is in a second state, for example, closed.

[0054] Furthermore, the resulting control signal for the proportional valve 11 is shown with reference numeral 111. In the example shown here, the proportional valve 11 is not controlled if the setpoint is less than or equal to x. If the setpoint exceeds the value x, an increasing control signal is provided to the proportional valve 11 as the setpoint increases. For example, the proportional valve 11 can be fully open at a setpoint of 100%. However, the start of a non-zero control signal for the proportional valve 11 does not necessarily have to coincide with the setpoint value for changing the switching state of the proportional valve 11. Different thresholds can be defined here, depending on the application.

[0055] By using such a scheme for determining multiple control signals for several valves, in particular for a proportional valve 11 and for a switching valve 12, based on a single control signal, especially a control signal representing a setpoint, the valve arrangement 1 can be easily connected to an external signal source 2 without the external signal source 2 having to generate a separate control signal for each valve 11, 12 of the valve arrangement 1 and provide it directly to the respective valves 11, 12. This significantly simplifies the connection of the valve arrangement 1 to an external signal source 2. In particular, the valve arrangement 1, and specifically the control device 10, can convert the control signal with the setpoint into the individual control signals for the individual valves 11, 12. This also allows for specific adaptation or...Configuration of the external signal source 2 to the individual properties or requirements of the valves 11, 12 is omitted.

[0056] The in Fig. The diagram shown in Figure 2 for generating the two control signals for the 2 / 2-way proportional valve 11 and the switching valve 12 is only an example. In principle, any other concepts are possible, such as special characteristic curves, parameterizable configurations, etc.

[0057] For example, the valve arrangement 1 and in particular the control device 10 can also be a configuration device (in Fig. (1 not shown). Such a configuration device can, for example, define the value range for the setpoint or the setpoint specification of the control signal. Alternatively or cumulatively, switching between a voltage-based and a current-based control signal is also possible. Alternatively or cumulatively, it is possible, for example, to adjust the control signals for the proportional valve 11 and / or the switching valve 12 using such a configuration device. Here, too, the value range for the control signal can be set and / or switching between voltage- and current-based control signals is possible. In this way, for example, when replacing a valve 11, 12 in the valve arrangement 1, the valve arrangement and, in particular, the generation of the control signals can be adapted. In addition, depending on the application, any other configurations orParameterization is possible.

[0058] For configuration using the configuration device, the configuration device can include one or more switching elements, such as DIP switches, jumpers, or similar components. This allows a user to easily identify the switch position or jumper position. This, in turn, makes it easy to transfer the corresponding configuration to another valve assembly 1. Thus, for example, if a valve assembly is replaced due to a defect or similar issue, the existing configuration can be easily transferred to the new valve assembly 1.

[0059] However, it is also possible, in principle, to transfer the configuration to the control unit 10 via a digital interface and to store it in preferably non-volatile memory. An additional configuration interface may be provided for this purpose. Alternatively, it is also possible, for example, to transfer such a configuration in a special configuration mode using the setpoint interface 10a. For example, the control unit 10 can be put into such a configuration mode by actuating a corresponding switching element. Subsequently, a configuration or parameterization can be transferred to the control unit 10 and stored there.

[0060] Fig. Figure 3 shows a schematic representation of an actuator device with a valve arrangement 1 according to one embodiment. For clarity, the control device 10 and the external signal source 2 are not shown in this illustration. However, this does not represent a limitation of the present invention, particularly of this embodiment. Rather, all previously mentioned provisions relating to the valve arrangement 1 also apply to this embodiment. Fig. 1 and Fig. 2 statements made.

[0061] The actuator device can, for example, include an actuator 3. This actuator 3 can be any actuator that performs an actuation using a fluid, for example, a liquid such as water or hydraulic fluid, or a gas, for example, air, in particular compressed air. For example, the actuator 3 can be a holding device or a gripper that exerts a force on an object to be held using a supplied fluid. In another example, the actuator 3 can be a metering device that performs a controlled dispensing of a substance to be metered using a supplied fluid. Furthermore, any other fluid-based actuator applications are, of course, also possible.

[0062] As shown in this embodiment, the actuator 3 can be connected to an application port 23 of the valve arrangement 1. The fluid can flow through this application port 23 either towards the actuator 3 or alternatively out of the actuator 3.

[0063] Furthermore, a first valve, for example a 2 / 2-way proportional valve 11, can be provided between a fluid inlet 21 and the application port 23. The fluid can be supplied at the inlet 21, for example, at a predetermined pressure. In this way, the flow of fluid from the inlet 21 to the application port 23 can be controlled by means of the proportional valve 11. For this purpose, the proportional valve 11 can be controlled by means of a suitable control signal. This control signal can, in particular, be generated according to the concept described above, based on the control signal received by the control unit 10.

[0064] Furthermore, another valve, for example a switching valve 12, is provided between the application port 23 and a drain 22. If this switching valve 12 is closed, the fluid can flow from the inlet 21 through the proportional valve 11 to the application port 23. This allows, for example, a desired pressure to be built up or a desired flow rate to be set in the actuator 3. If, on the other hand, the switching valve 12 is open, the fluid can flow towards the drain 22. Thus, any pressure in the actuator 3 can be reduced very quickly after the switching valve 12 is opened. A suitable control signal can also be provided to the switching valve 12 by the control unit 10 to open or close it. This control signal can also be generated based on the control signal for the setpoint received by the control unit 10.

[0065] If the control signals for the proportional valve 11 and the switching valve 12 are, for example, by the control unit 10 in accordance with the information in the Fig. As the concept shown in Figure 2 is generated, the switching valve 12 is initially closed when the setpoint value x is reached, in accordance with the control signal. With a further increase in the setpoint value, the proportional valve 11 is then continuously opened further. In this way, both valves 11 and 12 of the valve arrangement 1 can be individually controlled based on a single control signal. If, during subsequent operation, the setpoint value falls below the limit value x according to the control signal, the switching valve 12 is then opened, while the proportional valve 11 is simultaneously completely closed.

[0066] In addition to the components already described, the valve assembly 1 may optionally include further components, in particular one or more sensors. Such sensors can be used, for example, to detect and monitor the fluid pressure. In such a case, it is possible, for instance, to adjust the parameterization for generating the control signals for the proportional valve 11 and / or the switching valve 12 according to the currently detected pressure. This allows a control loop to be implemented. Thus, fluctuations in the fluid supply pressure can be balanced or at least partially compensated. Furthermore, the operating temperature of the valve assembly 1 and / or the fluid can also be detected, for example, using one or more temperature sensors.In this way, for example, temperature-dependent fluctuations in the switching characteristics of the proportional valve 11 and / or the switching valve 12 can be compensated for. Furthermore, the measured pressure, the monitored temperature, or, if applicable, other measured operating parameters in the valve arrangement 1 can be used to detect potential errors or malfunctions. For example, an error message can be issued if a limit value for a sensor value is exceeded or falls below a certain threshold. Additionally or alternatively, in such a fault situation, the valve arrangement 1 can be switched to a predefined safe operating state.

[0067] Fig. Figure 4 shows a schematic representation of a valve arrangement 1 according to one embodiment in a first operating state. The valve arrangement 1 is in an operating state in which a fluid can flow from the inlet 21 through the proportional valve 11 to the application port 23. The opening degree of the proportional valve 11 can be adjusted according to the control signal applied to the proportional valve 11. This enables the control of the flow rate or pressure at the application port 23 and of an actuator 3 connected to this application port 23. The switching valve 12 between the application port 23 and the outlet 22 is closed in this state.

[0068] Fig. Figure 5 shows a schematic representation of a valve arrangement 1 according to an embodiment in a further operating state. In this operating state, the proportional valve 11 is completely closed, while the switching valve 12 is open. Thus, the fluid can flow from the application port 23 towards the drain 22. In this way, pressure in an actuator 3 at the application port 23 can be rapidly reduced.

[0069] Fig.Figure 6 shows a flowchart illustrating a method for controlling a valve arrangement 1, in particular a previously described valve arrangement 1 with a 2 / 2-way proportional valve 11 and a switching valve 12 according to one embodiment. The method can, in principle, comprise any steps suitable for implementing a previously described valve arrangement 1 or an actuator device with such a valve arrangement 1. Similarly, the previously described valve arrangement 1 or actuator device with such a valve arrangement 1 can also comprise any components suitable for implementing the method described below.

[0070] In step S1, a control signal for a setpoint is received. The control signal can be received, for example, by a control unit 10 of the valve arrangement 1, in particular a setpoint interface 10a of the control unit 10.

[0071] In step S2, a first control signal is determined to control the 2 / 2-way proportional valve 11. The determination of the first control signal is carried out in particular using the received control signal for the setpoint.

[0072] In step S3, a second control signal is determined to control the switching valve 12. This second control signal is also determined using the received control signal for the setpoint. Specifically, both the first and second control signals are determined using the same received control signal for a setpoint.

[0073] Finally, in step S 4, the first control signal is output to the 2 / 2-way proportional valve 11 and the second control signal is output to the switching valve 12.

[0074] In summary, the present invention relates to a valve arrangement and a method for controlling a valve arrangement comprising a 2 / 2-way proportional valve and a switching valve. The valve arrangement receives a single control signal and generates several individual (in particular first and second) control signals for the individual valves of the valve arrangement from this control signal. REFERENCE MARK 1 Valve arrangement 2 external signal sources 3 Actuator 10 Control unit 10a, 10b, 10c interfaces 11 Proportional valve 12 switching valve 21 Inflow 22 Drain 23 Application connection 110 Target value specification 111, 112 Control signals S1-S4 process steps

Claims

[1] Valve arrangement (1), comprising: - a 2 / 2-way proportional valve (11) connected to an application port (23) at one port; - a switching valve (12) which is connected to the application port (23) at a connection; - a control device (10), with o a setpoint interface (10a) designed to receive a control signal for a setpoint, a first control interface (10b) designed to output a first control signal for controlling the 2 / 2-way proportional valve (11), and ◯ a second control interface (10c) designed to output a second control signal for controlling the switching valve (12), wherein the control device (10) is designed to generate the first control signal for controlling the 2 / 2-way proportional valve (11) and the second control signal for controlling the switching valve (12) each using the same received control signal for the setpoint. [2] Valve arrangement (1) according to claim 1, wherein the control signal for the setpoint comprises an analog voltage or current signal. [3] Valve arrangement (1) according to one of the preceding claims, wherein the control device (10) is designed to actuate the switching valve (12) if the control signal for the setpoint exceeds a first threshold value, and to actuate the 2 / 2-way proportional valve (11) if the control signal for the setpoint exceeds a second threshold value, wherein the second threshold value is greater than the first threshold value. [4] Valve arrangement (1) according to one of the preceding claims, wherein the 2 / 2-way proportional valve (11) is arranged between a fluid inlet (21) and the application port (23), and wherein the switching valve (11) is arranged between the application port (23) and a fluid outlet (22). [5] Valve arrangement (1) according to one of the preceding claims, wherein the switching valve (11) is designed as a normally open, NO, valve. [6] Valve arrangement (1) according to one of the preceding claims, comprising a configuration device designed to set the first threshold and / or the second threshold. [7] Valve arrangement (1) according to one of the preceding claims, comprising at least one sensor, in particular at least one pressure sensor and / or at least one temperature sensor, which is designed to sensualize an operating parameter in the valve arrangement (1), wherein the control device (10) is designed to adapt the actuation of the 2 / 2-way proportional valve (11) and / or the switching valve (12) using the sensual operating parameters and / or to detect a malfunction in the valve arrangement. [8] Valve arrangement (1) according to one of the preceding claims, wherein the application port (23) is designed to be coupled to an actuator (3) and to actuate the actuator (3) using a fluid provided at the application port (23). [9] Fluid-controlled actuator device, with: at least one actuator (3) designed to actuate a valve arrangement (1) according to any of the preceding claims using a fluid flow and / or fluid pressure; wherein the application port (23) of the valve arrangement (1) is coupled to a fluid port of the at least one actuator (3). [10] Method for controlling a valve arrangement according to any one of claims 1 to 8, comprising a 2 / 2-way proportional valve (11) connected at one port to an application port (23) and a switching valve (12) connected at one port to the application port (23), comprising the steps: - Receiving (S 1) a control signal for a setpoint; - Determining (S 2) a first control signal to control the 2 / 2-way proportional valve (11) using the received control signal for the setpoint; - Determining (S 3) a second control signal for controlling the switching valve (12) using the received control signal for the setpoint, wherein the first control signal for controlling the 2 / 2-way proportional valve (11) and the second control signal for controlling the switching valve (12) are each determined using the same received control signal for the setpoint; and - Output (S 4) of the first control signal to the 2 / 2-way proportional valve (11) and of the second control signal to the switching valve (12).

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