Method for controlling a valve arrangement, valve arrangement and valve assembly

Abstract

The present invention relates to a valve arrangement and a valve assembly comprising a plurality of valve arrangements, and to a method for controlling a valve arrangement, wherein the valve arrangement comprises a plurality of valves arranged in parallel. The individual valves of the valve arrangement can be controlled on the basis of pulse width modulated control signals.

Description

[0001] Description

[0002] Title: METHOD FOR CONTROLLING A VALVE ASSEMBLY, VALVE ASSEMBLY AND VALVE ASSEMBLY

[0003] Technical field

[0004] The present invention relates to a method for controlling a valve arrangement. In particular, the invention relates to a valve arrangement and a valve assembly with several valve arrangements.

[0005] background

[0006] Valves play a crucial role in controlling fluid flow. Some valves have two defined operating states: fully open or fully closed. This allows a fluid flow to be either completely released or blocked. Such valves are known, for example, as switching valves. In addition, there are proportional valves, which, besides the two states of fully open and fully closed, can also continuously vary the opening cross-section.

[0007] Proportional valves are generally more complex than rotary valves. In particular, proportional valves require more installation space than rotary valves for the same maximum opening cross-section. Furthermore, proportional valves are typically significantly more expensive than rotary valves with a comparable maximum opening cross-section.

[0008] Additionally, with an increasing maximum opening cross-section of a valve, both the required installation space volume and the costs of the valves increase.

[0009] Furthermore, it should be noted that electrically actuated valves can be subject to wear over time. In particular, the service life of such valves can be limited. A complete valve failure or replacement at the end of its service life can cause a temporary shutdown of the technical system in which this valve operates. Against this background, there is a need for a valve arrangement that addresses these issues. Specifically, there is a need for a valve arrangement that allows the use of more cost-effective valves, especially switching valves, to control a flow rate and / or outlet pressure over a desired control range. In addition, a valve arrangement is required that offers at least limited redundancy, so that continued operation (possibly limited) is possible even in the event of a valve failure or during maintenance.Furthermore, there is a need for a concept for controlling such a valve arrangement.

[0010] Disclosure of the invention

[0011] The present invention provides a method for controlling a valve arrangement, in particular a valve arrangement with multiple valves, as well as a valve arrangement and a valve assembly with the features of the independent claims. Further advantageous embodiments are the subject of the dependent claims.

[0012] The solution to the problem is described below with reference to the method, a valve arrangement, and a valve assembly. Features, advantages, or alternative embodiments mentioned in connection with the method are also transferable to the other claimed objects (devices) and vice versa. In other words, the claims to the present object (which, for example, relate to the valve arrangement or the valve assembly) 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 of the device, 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 principle, the claimed valve arrangement, in particular its control device, is designed to carry out the claimed method.

[0013] According to a first aspect, a method for controlling a valve assembly, in particular for controlling a valve assembly with multiple valves, is provided. The inlet ports of the multiple valves are connected to a common fluid inlet. Likewise, the outlet ports of the multiple valves are connected to a common fluid outlet, so that the multiple valves are arranged parallel to one another. The method includes a step for generating individual control signals for the multiple valves. In particular, the generation of these control signals includes pulse width modulation. Optionally, a period can also be modulated. Furthermore, the method includes a step for providing the generated individual control signals for each valve. In particular, the provision of the generated individual control signals can be used for the selective control of the respective valve.

[0014] According to a second aspect, a valve arrangement is provided. The valve arrangement comprises a fluid inlet, a fluid outlet, several valves, and a control device. Each of the several valves has an inlet opening and an outlet opening. The inlet openings of the several valves are connected to the fluid inlet. The outlet openings of the several valves are connected to the fluid outlet. The valves are arranged parallel to one another. The control device is designed to carry out the method according to the invention, in particular the method according to the first aspect. Furthermore, the control device is designed to provide the generated control signals for the valves, wherein the signals include at least a pulse width modulation and optionally a period modulation.

[0015] According to one embodiment, the multiple valves can have at least partially different maximum flow rates, so that a desired flow rate or output pressure can be achieved through a cascade-like configuration.

[0016] In another embodiment, at least two of the valves can have an at least approximately equal maximum flow rate. This allows for increased redundancy.

[0017] According to a third aspect, a valve assembly is provided. The valve assembly comprises a fluid supply, a fluid outlet, a first actuator port, a second actuator port, and four valve arrangements according to the invention, in particular valve arrangements according to the second aspect. The fluid inlet of the first valve arrangement is connected to the fluid supply, and the fluid outlet of the first valve arrangement is connected to the first actuator port. The fluid inlet of the second valve arrangement is also connected to the fluid supply, and the fluid outlet of the second valve arrangement is connected to the second actuator port. The fluid inlet of the third valve arrangement is connected to the first actuator port, and the fluid outlet of the third valve arrangement is connected to the fluid outlet. The fluid inlet of the fourth valve arrangement is connected to the second actuator port, and the fluid outlet of the fourth valve arrangement is also connected to the fluid outlet.

[0018] The control signals for the valves of all four valve arrangements can be generated and provided by a common control unit.

[0019] The present invention is based on the understanding that switching valves, which can only assume the states "open" or "closed", are typically easy to control, robust, require little installation space, and are available at low cost. Proportional valves, on the other hand, which can vary the opening cross-section to control, for example, the flow rate or the outlet pressure, require a more complex design and thus a larger installation volume.

[0020] Furthermore, the present invention is based on the knowledge that precise control of the fluid with respect to pressure and / or flow rate is required to control technical actuators that are operated by means of a fluid.

[0021] Based on these findings, the object of the present invention is to create a concept that enables precise control of the flow rate or the outlet pressure using multiple valves, in particular switching valves. For this purpose, it is provided that a valve arrangement with several parallel valves between a fluid inlet and a fluid outlet is controlled by individually modulated control signals – in particular pulse-width modulation. In particular, by providing individually modulated control signals for each valve, very precise control of the flow rate or the outlet pressure can be achieved.

[0022] The fluid used in the invention can be gaseous media such as compressed air or liquid media such as water, oil, etc.

[0023] A valve according to the invention comprises an electromechanical assembly that manipulates the flow of a fluid between a first port, e.g., an inlet port, and a second port, e.g., an outlet port. This manipulation can include completely interrupting the fluid flow (closing the valve) or allowing the maximum flow cross-section (opening the valve). Valves that can only switch between "open" and "closed" are called switching valves; valves that can adjust the flow cross-section are called proportional valves.

[0024] In the context of the invention, a control signal is understood to be an electrical signal that is provided to a valve to set a desired state. For example, an electrical signal with a specific voltage and / or current can be used to set a switching state, such as "closed" or "open" of the valve. In the case of a proportional valve, the opening cross-section of the valve can be set by a voltage or current between the values ​​for "open" and "closed".

[0025] A valve that is completely closed without a control signal is called an NC (normally closed) valve, a completely open one is called an NO (normally open) valve.

[0026] Pulse width modulation (PWM) generates a periodic signal. A characteristic parameter of a PWM signal is the period T, the interval at which the pulses repeat. The frequency f = 1 / T is the reciprocal of the period T. A PWM signal typically alternates between two states, "logic 0" and "logic 1". The time interval between the change from 0 to 1 and back to 0 is called the pulse duration or pulse width. The remaining time is the pause time. The sum of the pulse duration and the pause time yields the period T. The ratio of pulse duration to period is called the duty cycle or duty cycle.

[0027] In addition to controlling the valves based on rectangular control signals, control can optionally also be based on other suitable signal shapes, such as a sinusoidal control signal or similar.

[0028] The control unit of the valve assembly for generating individual control signals for the valves can be implemented, for example, by an electronic processing unit. Such a unit can include a processor that communicates with a memory containing instructions that cause the processor to execute the procedure. The control unit can include one or more interfaces that output the generated control signals for the valves. A separate interface can be provided for each valve to supply the signals. The control signals can be provided as electrical signals with specific voltage and / or current values. If necessary, the signals can be amplified by driver stages. The control unit can also include input interfaces to receive setpoints for parameters such as flow rate or fluid pressure.

[0029] Additionally, the control unit may have communication interfaces to provide instructions, parameterizations or new programming, as well as sensor interfaces to provide sensor values ​​such as temperature, pressure or flow rate.

[0030] According to one embodiment, the method includes a step for receiving a setpoint for fluid flow through the valve arrangement. The generation of individual control signals for the multiple valves can be performed such that the received setpoint for fluid flow is maintained. In other words, the generation of the individual control signals determines a separate control signal for each valve to be controlled, which, in sum, sets a specific flow cross-section in the valves to achieve the setpoint.

[0031] According to a further embodiment, the method includes a step for determining at least one operating parameter for one or more of the valves. This determination can be performed actively on the instance where the method is implemented. Alternatively or cumulatively, the determination can include passively receiving the at least one operating parameter, for example, from provided sensors. Additionally or alternatively, the method can determine an operating characteristic curve for one or more valves. This determination can include receiving the operating parameter or the operating characteristic curve from an external component, such as a higher-level control system. The transmission of the operating parameters can be performed via a digital data interface. Operating parameters can include various aspects, including: operating time, i.e.,h the total operating time and, if applicable, the number of switching cycles to account for wear and aging and to ensure an even distribution of operating times; flow rate, in particular the maximum flow rate of each valve can be included in the control to optimally regulate the target flow and utilize the valves efficiently; temperature or temperature distribution, which can be used to optimize the control so that uniform heating is achieved and thermal wear is reduced; or pressure, or to ensure a stable pressure flow. In one embodiment, the operating parameter includes an operating time. The operating time can include, in addition to the total operating time, a sum of the periods in which the respective valve is actively controlled. Alternatively, the operating time can also represent a maximum number of switching cycles.Specifying the operating time allows for the consideration of aging effects or wear. In particular, the control signals for the valves can be generated using the operating parameter, thus achieving a uniform distribution of operating times across all valves.

[0032] In another embodiment, at least one operating parameter includes a flow rate, in particular the maximum flow rate of the valve. From this, the total flow rate of the valve arrangement can be determined. The individual flow rates of the valves enable a control configuration that comes as close as possible to the specifications for a target flow rate.

[0033] In a further embodiment, the method includes a step for determining the temperature or temperature distribution of the valves. The control signals for the valves can be generated using the determined temperature, resulting in a uniform temperature distribution across the valves. The temperature distribution can be calculated using temperature sensors on the valves or by modeling, taking into account the control of each individual valve. By considering the temperature distribution, uniform heating of the valves can be achieved, thus minimizing wear.

[0034] According to a further embodiment, the method includes determining an individual operating time for each of the valves. The control signals for the valves can be generated using a predetermined operating time characteristic, which enables a uniform distribution of the valves' operating time. Alternatively, robust valves that allow a higher number of switching cycles can be preferentially controlled. Inexpensive or easily replaceable valves can also be preferentially controlled to reduce wear costs.

[0035] According to one embodiment, the method includes a step for determining an individual operating time for each of the multiple valves. Accordingly, the generation of individual control signals for the valves can be carried out taking the determined operating time into account. In particular, the generation of the individual control signals can be based on a predetermined characteristic for the operating time of the individual valves. Such a characteristic can, for example, include a uniform distribution of the operating time of the valves. Alternatively, it is also possible to adjust the operating time according to other specifications or preferences. For example, particularly robust valves that have a higher number of permissible switching cycles or a longer service life can be preferentially controlled.Similarly, inexpensive or readily available valves, or those that are particularly easy to replace due to the design of the valve assembly, may be preferred. Furthermore, other suitable characteristics for adapting the individual service life are also conceivable.

[0036] According to another embodiment, the predetermined characteristic can, for example, include a maximum operating time or a ratio of the individual operating times of the valves. The operating time can refer either to the total operating time during which fluid flows through a valve or to a summation of the intervals in which the valves are actively actuated. Alternatively, the operating time can also be considered as the sum of the switching cycles, taking all switching on and off operations into account. Accordingly, a scheme can be chosen for generating the individual actuation signals in which the operating time of the valves approaches their respective maximum operating times as uniformly as possible. Alternatively, an operating strategy can be chosen in which the operating time of the individual valves corresponds to certain predefined ratios or is distributed as uniformly as possible across all valves.

[0037] In another embodiment, the method includes receiving a signal to deactivate a specific valve. The generation of the control signals can take the deactivation of the valve into account. Furthermore, the method can include adjusting the control signals of the other valves to maintain the overall flow rate.

[0038] The signaling for deactivating a valve can include identifying a faulty valve or a valve whose operating time has exceeded a predefined threshold. External signaling, e.g., through manual input or an external processing unit, is also possible. A faulty operating state can be detected by a discrepancy between the target and actual state.

[0039] In another embodiment, the control signals for the valves are generated using a common pulse-width modulation (PWM) frequency. Alternatively, some valves can be operated at a multiple of the PWM frequency to achieve finer control.

[0040] The process involves generating control signals with individual pulse widths or pulse positions, which allows for flexible control of the flow rate and pressure.

[0041] In a further embodiment, the method includes the acquisition of an optimization criterion. This optimization criterion can include minimizing the energy consumption of the valve arrangement or the noise generated when the valves are actuated.

[0042] In another embodiment, the valves of the valve arrangement are designed as switching valves that can only assume the states "open" or "closed". Examples of such switching valves are solenoid valves or piezoelectric valves.

[0043] Brief description of the characters

[0044] 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:

[0045] Fig. 1: a schematic representation of a valve arrangement according to one embodiment;

[0046] Fig. 2: a schematic representation to illustrate pulse modulation for a valve arrangement according to one embodiment;

[0047] Fig. 3: a schematic representation to illustrate a further pulse modulation for a valve arrangement according to one embodiment;

[0048] Fig. 4: a schematic representation of a valve assembly according to one embodiment; and

[0049] Fig. 5 shows a flowchart of a method for controlling a valve arrangement according to one embodiment. 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.

[0050] 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.

[0051] Detailed description of the invention

[0052] Figure 1 shows a schematic representation of a block diagram of a valve arrangement 1 according to one embodiment. The valve arrangement 1 here comprises, by way of example, four valves 10-i. The number of four valves 10-i shown here is merely exemplary and does not represent a limitation of the present invention. Rather, fewer or more valves 10-i are also possible for a valve arrangement 1.

[0053] Each of the valves 10-i comprises two ports, in particular an inlet port 11-i and an outlet port 12-i. The inlet ports 11-i of all valves 10-i are connected to a fluid inlet 21. Likewise, the outlet ports 12-i of all valves 10-i are connected to a fluid outlet 22. Thus, the valves 10-i are arranged in parallel between the fluid inlet 21 and the fluid outlet 22.

[0054] Valves 10-i can be any type of valve with two ports, specifically an inlet port 11-i and an outlet port 12-i. For example, (robust) solenoid valves are possible as valves 10-i, where opening and / or closing is achieved by means of an electromagnetic element. Alternatively, (fast, precise) valves with piezoelectric technology, where a piezoelectric element is used as the actuator, or similar technologies are also possible. In addition to simple switching elements that can only be fully opened or fully closed, so-called proportional valves are also possible, where the cross-sectional area of ​​the flow through valve 10-i can be controlled within a predetermined range between fully closed and fully open.

[0055] Valves 10-i can, for example, be configured as valves that can assume a defined state without an active control signal. For instance, NC (normally closed) valves are possible, which remain closed without an active control signal. Alternatively, the valves can also be configured as NO (normally open) valves, which remain open without an active control signal. In this way, the valve arrangement 1 can be configured to assume a clearly defined state even without active control signals. It is also possible to configure some of the valves 10-i as NC valves and some as NO valves. This allows a defined resulting total opening cross-section to be achieved even without an active control signal, which is defined by the sum of the opening cross-sections of the NO valves.

[0056] The valves 10-i of the valve arrangement 1 can, for example, be several identical or similar valves 10-i. For instance, all valves 10-i can have the same or similar properties, such as maximum opening cross-section, maximum flow rate, maximum operating time, etc. Alternatively, it is also possible that the valves 10-i of the valve arrangement 1 differ in at least one parameter. For example, the valves 10-i can have at least partially different opening cross-sections or maximum flow rates when open.

[0057] The control signals for the valves 10-i can be provided by a control unit 30. For example, the control unit 30 can include an interface 31. This control unit 30 can have an individual connection for each of the valves 10-i. Furthermore, the control unit 30 can have one or more additional interfaces 32. For example, one or more sensors (not shown in Figure 1) can be connected via such an interface 32. Such sensors can be used, for example, to detect the temperature or temperature distribution of the valve arrangement 1. The sensors can also include, for example, flow sensors, pressure sensors, or other types of sensors.

[0058] For example, the control unit can acquire 30 sensor values ​​from pressure and / or flow sensors and monitor the valve arrangement 1 based on this data. For instance, the flow rate or current pressure can be compared with an expected value corresponding to the switching states of the valves 10-i. If the sensor-acquired data deviates from the expected values, particularly by more than a predefined threshold, this may indicate a fault or malfunction in the valve arrangement 1. If necessary, a faulty valve 10-i in the valve arrangement 1 can also be identified by evaluating the sensor data and comparing it with the expected values.

[0059] Furthermore, the control unit 30 can also receive setpoint values ​​for a volume flow rate or flow quantity and / or an outlet pressure to be set at the fluid outlet 22 via an interface 32. In addition, any other setpoint values ​​can also be received.

[0060] Furthermore, additional data, such as characteristic data of the valves 10-i (e.g., flow rate or opening), control parameters such as current and / or voltage values, switching times, maximum operating time, maximum number of switching operations, or similar information, can be provided at an interface 32 by the control unit 30. In particular, the data received from the interface 32 can be stored in one or more storage units 33, especially non-volatile memory.

[0061] The control unit 30 of the valve arrangement 1 can control at least one of the valves 10-i with a pulsed control signal that has a modulated pulse width or period. This enables pulse-width modulated control of the corresponding valve 10-i. Preferably, several, in particular all, valves 10-i are controlled by the control unit 30 using such pulsed control signals. The generation of the pulse-width modulated control signals (PWM signals) can be based on a common PWM frequency for some, in particular all, valves 10-i. For example, one pulse per period can be provided in each PWM-modulated control signal. Optionally, however, several pulses per period can also be provided.

[0062] Although the principle according to the invention is preferably described below based on rectangular signals, such as those used in pulse width modulation, the present invention is not fundamentally limited to this. Rather, other suitable signal shapes, for example sinusoidal control signals or the like, can also be provided. Figure 2 shows a schematic representation to illustrate the principle for controlling several valves 10-i based on pulsed control signals. For the sake of simplicity, only the control signals for two valves 10-i are shown here.

[0063] The upper diagram in Figure 2 shows a first control signal for a first valve 10-1. This control signal has a period T. A single pulse has a pulse duration P1. Although the pulse duration P1 is shown as constant here, it can change over time during control or regulation. The ratio of the pulse duration P1 to the total period T yields a so-called duty cycle or duty ratio P1 / T.

[0064] The diagram below shows the control signal for a second valve 10-2. In the example shown here, the two control signals have the same period T and the same pulse width P1. Accordingly, the two valves 10-1 and 10-2 are opened and closed at the same times.

[0065] The result is the curve shown in the lower diagram of Figure 2 for the resulting total opening cross-section Q_res of the valve arrangement 1. In the embodiment assumed here, the second valve 10-2 has a larger opening cross-section than the first valve 10-1. This is shown in the diagram by the dashed lines Q1 and Q2.

[0066] Figure 3 shows a schematic representation illustrating the control principle according to the invention with different pulse widths for the first valve 10-1 and the second valve 10-2. In this example, the first valve 10-1 is actuated with a longer pulse P2, which also begins before the shorter pulse P3 for the second valve 10-2. The resulting cross-sectional area Q_res is shown in the lower diagram. Due to the different switching times for the first valve 10-1 and the second valve 10-2, it is thus possible to modify not only the amplitude of the resulting pulse Q_res but also its shape. By using more than two valves 10-i, even more detailed adjustment of the resulting pulse shape can be achieved.

[0067] In addition to modifying the switching times and pulse duration for controlling the valves 10-i, further optimizations in the operating strategy are also possible with the described valve arrangement 1. For example, the individual valves 10-i of a valve arrangement 1 can be controlled during operation according to a predefined scheme such that the stress on the individual valves 10-i corresponds to specified conditions. For example, the individual valves 10-i can be controlled in such a way that a desired temperature distribution is achieved at the valves 10-i, for example, a uniform distribution across the valve arrangement 1. In a simple case, the individual valves 10-i can be controlled alternately and uniformly.Furthermore, it is also possible, for example, to calculate a temperature distribution at the valve arrangement 1 based on a model that takes into account information about the control of the individual valves 10-i. Additionally or alternatively, the temperature distribution at the valve arrangement 1 can be recorded using one or more temperature sensors and evaluated in the control unit 30.

[0068] In addition to considering temperature development at the valve assembly 1, further operating parameters can also be taken into account. For example, operating time, number of switching operations, aging effects, etc., can be considered when generating the control signals for the individual valves 10-i. This allows the control signals for the individual valves 10-i to be generated in such a way that predefined parameters are met. For example, individual operating times, switching frequencies, etc., can be specified for each valve 10-i. Based on this, the control signals for the individual valves 10-i can be generated in such a way that these specifications are met and the limits for operating time, switching frequency, etc., are reached for all valves 10-i at the same or at least approximately the same time.This allows, for example, the optimization of maintenance intervals for valve arrangement 1.

[0069] Furthermore, if one valve 10-i fails, the control signals for the remaining valves 10-i in the valve arrangement can be adjusted so that a predefined setpoint for the flow rate and / or the outlet pressure can still be maintained, at least approximately. For example, a faulty valve can be identified and then deactivated by analyzing measured values ​​for pressure and / or volume flow. Alternatively, it is also possible to receive a specification for deactivating one or more predefined valves from an external signal source or a user. For example, one or more valves 10-i in the valve arrangement 1 can be deactivated for maintenance during operation. The control unit 30 can then adjust the control of the remaining valves 10-i so that the predefined setpoints are maintained as accurately as possible.Furthermore, the deactivated valves can then be serviced and, if necessary, replaced without having to completely take the valve assembly 1 out of service. In particular, for example, if one or more defective valves are automatically identified, the valve assembly 1 can continue to be operated and, if necessary, serviced.

[0070] If one valve 10-i is replaced by another valve 10-i, it is also possible, for example, to provide the specifications of the newly installed valve 10-i to the control unit 30. The control unit 30 can then evaluate the information of the new valve 10-i and, based on this information, adjust the generation of the control signals for the individual valves 10-i accordingly. In this way, for example, valves 10-i can also be replaced by valves with different properties, such as a different flow cross-section, different specifications for current and / or voltage for controlling the valves, a different temperature behavior, different requirements for operating time or the number of switching operations, etc. By automatically taking the new parameters into account, the control unit 30 can then adjust the control of the valve arrangement 1.

[0071] Figure 4 shows a schematic representation of a valve assembly 2 according to one embodiment. The valve assembly 2 comprises four valve arrangements 1-i. The four valve arrangements 1-i are arranged in a bridge configuration. The valve arrangements 1-i can, in particular, be valve arrangements 1 of the embodiments described above.

[0072] The valve assembly 2 comprises a fluid supply 2a and a fluid outlet 2b. For example, the fluid supply 2a could be a compressed air connection or similar. The fluid outlet 2b could, for example, be an outlet to the environment.

[0073] Furthermore, the valve assembly 2 comprises a first actuator connection 3a and a second actuator connection 3b. An actuator 3, in particular a compressed air-operated actuator, can be connected to these two actuator connections 3a, 3b.

[0074] A first valve arrangement 1-1 is arranged between the fluid supply 2a and the first actuator port 3a. A second valve arrangement 1-2 is arranged between the fluid supply 2a and the second actuator port 3b. A third valve arrangement 1-3 is arranged between the first actuator port 3a and the fluid outlet 2b. A fourth valve arrangement 1-4 is arranged between the second actuator port 3b and the fluid outlet 2b.

[0075] The four valve arrangements 1-i can in particular be controlled by a common control unit 30.

[0076] Figure 5 shows a flowchart of a method for controlling a valve arrangement 1 according to one embodiment. The method can be applied, in particular, to a valve arrangement 1 as previously described in connection with Figures 1 to 4. Accordingly, the method can, in principle, include any steps suitable for implementing the valve arrangements 1 described above. Similarly, the valve arrangements described above can also include any units, components, or assemblies suitable for realizing the method described below.

[0077] The procedure includes a step S1 for generating individual control signals for the multiple valves 10-i. The control signals for the multiple valves 10-i include at least one modulation of a pulse width or a period duration.

[0078] In step S2, the generated individual control signals are provided to the respective valves 10-i for selective control of the respective valve 10-i.

[0079] The method can further include a step for receiving a setpoint for the fluid flow rate of the valve arrangement 1. Here, the generation of the individual control signals for the multiple valves 10-i can be carried out such that the received setpoint for the fluid flow rate of the valve arrangement 1 is maintained.

[0080] The method can further include a step for determining at least one operating parameter or operating characteristic curve for at least one of the multiple valves 10-i. The generation of individual control signals for the multiple valves 10-i can then be carried out using the determined at least one operating parameter or operating characteristic curve. The operating parameter can include an operating duration. The generation of the control signals for the multiple valves 10-i can then be carried out using a predetermined characteristic curve for the operating duration.

[0081] The operating parameter can include, in particular, a flow rate.

[0082] The method can further include a step for determining a temperature or temperature distribution for the multiple valves 10-i. Here, the individual control signals for the multiple valves 10-i can be generated using the determined temperature or temperature distribution. In particular, the multiple valves 10-i can be controlled such that at least an approximately identical temperature is established at the multiple valves 10-i of the valve arrangement 1.

[0083] The method can further include a step to determine the individual operating time of each of the multiple valves 10-i. The generation of individual control signals for the multiple valves 10-i can then be carried out using the determined operating time. In particular, the generation of the individual control signals can be carried out using a predetermined characteristic for the operating time. The control can be implemented in such a way that the operating time of the individual valves is distributed as evenly as possible. Optionally, particularly robust or cost-effective valves 10-i can be preferred.

[0084] The predetermined characteristic can, for example, include a maximum operating time. Additionally or alternatively, the predetermined characteristic can also include a ratio of the individual operating times of the multiple valves 10-i.

[0085] The method can further include a step for receiving a signal to deactivate a specific valve among the multiple valves 10-i. Generating the individual control signals for the multiple valves 10-i can include deactivating the specific valve. Furthermore, generating the individual control signals can include adjusting the control signals for the remaining valves using a set total flow rate of the valve arrangement.

[0086] Receiving the signal to deactivate at least one of the multiple valves 10-i can, for example, include identifying a faulty valve among the multiple valves. Furthermore, receiving the signal can include identifying a valve whose operating time has exceeded a predetermined threshold. In addition, receiving the signal can include receiving an external signal, such as a manual input or similar.

[0087] The individual control signals for the multiple valves 10-i can be generated, in particular, using a common frequency for pulse width modulation. For example, one pulse per period of the pulse width modulation can be used as the control signal. Alternatively, multiple pulses per period can also be provided, if necessary.

[0088] Generating the individual control signals for the multiple valves can, in particular, include an individual pulse width and / or an individual position of the pulse within the period for each control signal.

[0089] Furthermore, one or more optimization criteria can be recorded in the process. Here, the individual control signals for the multiple valves 10-i are generated using the received optimization criterion.

[0090] The valves 10-i of the valve arrangement can preferably be designed as switching valves, in particular as magnetically or electromagnetically actuated switching valves and / or as switching valves based on piezo technology.

[0091] In summary, the present invention relates to a valve arrangement and a valve assembly with several valve arrangements, and a method for controlling a valve arrangement, wherein the valve arrangement comprises several valves arranged in parallel. The individual valves of the valve arrangement can be controlled based on control signals with a modulated pulse width.

[0092] REFERENCE MARK

[0093] 1 - Valve arrangement

[0094] 2 - Valve assembly

[0095] 2a - Fluid supply

[0096] 2b - Fluid leakage

[0097] 3 - Actuator

[0098] 3a, 3b - Actuator connections

[0099] 10-i - valves

[0100] 11-i - Entrance opening

[0101] 12-i - Outlet opening

[0102] 21 - Fluid inlet

[0103] 22 - Fluid outlet

[0104] 30 - Control unit

[0105] 31, 32 - Interfaces

[0106] 33 - Storage unit

[0107] P1, P2, P3 - Pulse widths

[0108] Q1, Q2, Q_res - Opening cross-sections

[0109] T - Period

Claims

PATENT CLAIMS 1. Method for controlling a valve arrangement (1) with several valves (10-i), in particular switching valves, wherein the inlet openings (11-i) of the several valves (10-i) are connected to a common fluid inlet (21) and the outlet openings (12-i) of the several valves (10-i) are connected to a common fluid outlet (22), such that the several valves (10-i) are arranged parallel to each other, and wherein the method comprises: - Generating (S1) individual control signals for the multiple valves (10-i), wherein the control signals for the multiple valves (10-i) include at least a modulation of a pulse width, optionally a period duration; and - Providing (S2) the respective generated individual control signal for the respective valve (10-i) for selective control of the respective valve (10-i).

2. Method according to claim 1, comprising a step for receiving a setpoint for a fluid flow of the valve arrangement (1), wherein the generation of the individual control signals for the multiple valves (10-i) is carried out such that the received setpoint for the fluid flow of the valve arrangement (1) is maintained.

3. Method according to one of the preceding claims, comprising a step for determining at least one operating parameter or operating characteristic curve for at least one valve of the multiple valves (10-i), wherein the generation (S1) of the individual control signals for the multiple valves (10-i) is carried out using the determined at least one operating parameter or operating characteristic curve.

4. Method according to claim 3, wherein the operating parameter includes an operating duration and wherein the generation (S1) of the control signal for the multiple valves (10-i) is carried out using a predetermined characteristic for the operating duration.

5. Method according to claim 3 or 4, wherein the operating parameter includes a flow rate.

6. A method according to any of the preceding claims, comprising a step for determining a temperature or temperature distribution for the multiple valves (10-i), wherein the generation (S1) of the individual control signals for the multiple valves (10-i) is carried out using the determined temperature or temperature distribution, in particular, wherein the multiple valves (10-i) are controlled such that at least an approximately identical temperature is set at the several valves (10-i) of the valve arrangement (1).

7. Method according to one of the preceding claims comprising a step for determining an individual operating time of each of the multiple valves (10-i), wherein the generation (S1) of the individual control signals for the multiple valves (10-i) is carried out using the determined operating times, in particular, wherein the multiple valves (10-i) are operated using a predetermined characteristic for the operating time.

8. Method according to claim 7, wherein the predetermined characteristic comprises a maximum operating time and / or a ratio of the individual operating times of the multiple valves.

9. Method according to one of the preceding claims comprising a step for receiving a signal to deactivate a specific valve of the multiple valves (10-i), wherein generating (S1) the individual control signals for the multiple valves (10-i) comprises deactivating the specific valve and adjusting the control signals of the remaining valves using an adjustable total flow of the valve arrangement (1).

10. Method according to claim 9, wherein receiving the signaling to deactivate at least one specific valve of the multiple valves comprises identifying a faulty valve of the multiple valves (10-i), identifying a valve whose operating time has exceeded a predefined threshold and / or receiving an external signaling.

11. Method according to one of the preceding claims, wherein the individual control signals for the multiple valves (10-i) are generated using a common frequency for pulse width modulation.

12. Method according to claim 11, wherein generating the individual control signals for the multiple valves (10-i) comprises for each control signal an individual pulse width and / or an individual position of the pulse within the period.

13. Method according to one of the preceding claims, wherein an optimization criterion is captured, and wherein the individual control signals for the multiple valves (10-i) are generated using the optimization criterion.

14. Method according to one of the preceding claims, wherein at least one valve is designed as a switching valve and / or wherein at least one valve comprises an actuator with piezo technology or an electromagnetic actuator.

15. Valve arrangement (1), comprising: - a fluid inlet (21); - a fluid outlet (22); - several valves (10-i) each with an inlet port (11-i) and an outlet port (12-i), wherein the inlet ports (11-i) of the several valves (10-i) are connected to the fluid inlet (21) and the outlet ports (12-i) of the valves (10-i) are connected to the fluid outlet (22), such that the several valves (10-i) are arranged parallel to each other; and - a control device (30) designed to perform a method according to one of the preceding claims and intended to generate control signals for the multiple valves (10-i) and to provide the generated control signals for the respective valves (10-i), wherein the control signals for the multiple valves (10-i) comprise at least a modulation of a pulse width, optionally a period duration.

16. Valve arrangement (1) according to claim 15, wherein the multiple valves (10-i) have at least partially different maximum flow rates.

17. Valve arrangement (1) according to claim 15 or 16, wherein at least two valves have at least approximately the same maximum flow rate.

18. Valve assembly (2), comprising: - a fluid supply (2a); - a fluid leak (2b); - a first actuator connection (3a); - a second actuator connection (3b); - four valve arrangements (1-i) according to one of claims 15 to 17, - wherein the fluid inlet of a first valve arrangement (1-1) is connected to the fluid supply (2a), - the fluid outlet of the first valve arrangement (1-1) is connected to the first actuator port (3a), - the fluid inlet of a second valve arrangement (1-2) is connected to the fluid supply (2a), - the fluid outlet ) of the second valve arrangement (1-2) is connected to the second actuator connection (3b) is connected, - the fluid inlet of a third valve arrangement (1-3) is connected to the first actuator port (3a), - the fluid outlet of the third valve arrangement (1-3) is connected to the fluid outlet (2b), - the fluid inlet of a fourth valve arrangement (1-4) is connected to the second actuator port (3b), and - the fluid outlet of the fourth valve arrangement (1-4) is connected to the fluid outlet (3b).

19. Valve assembly (2) according to claim 18, wherein the valves (10-i) of all valve arrangements (1) are generated and provided by a common control unit (30).

Images