WO2021183108A1

WO2021183108A1 - Valve control based on print data

Info

Publication number: WO2021183108A1
Application number: PCT/US2020/021805
Authority: WO
Inventors: Daryl Eugene ANDERSON; James Michael GARDNER; Paul Mark Haines; Ronald J. Ender
Original assignee: Hewlett-Packard Development Company, L.P.
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2021-09-16

Abstract

In some examples, a controller controls, based on fluid dispensing control data, an electrically-activated valve that is part of a body of a fluid dispensing device, where the control of the electrically-activated valve is to cause adjustment of fluid flow circulation in a recirculation system to control a fluidic pressure of the fluid dispensing device.

Description

VALVE CONTROL BASED ON PRINT DATA

Background

[0001] A fluid dispensing system can dispense fluid towards a target. In some examples, a fluid dispensing system can include a printing system, such as a two- dimensional (2D) printing system or a three-dimensional (3D) printing system. A printing system can include printhead devices that include fluidic actuators to cause dispensing of printing liquids.

Brief Description of the Drawings

[0002] Some implementations of the present disclosure are described with respect to the following figures.

[0003] Figure 1 is a block diagram of a portion of a fluid dispensing system according to some examples.

[0004] Figure 2 is a block diagram of a storage medium storing machine- readable instructions according to some examples.

[0005] Figure 3 is a block diagram of a fluid dispensing device according to some examples.

[0006] Figure 4 is a flow diagram of a process according to some examples.

[0007] Throughout the drawings, identical reference numbers designate similar, but not necessarily identical, elements. The figures are not necessarily to scale, and the size of some parts may be exaggerated to more clearly illustrate the example shown. Moreover, the drawings provide examples and/or implementations consistent with the description; however, the description is not limited to the examples and/or implementations provided in the drawings. l Detailed Description

[0008] A fluid dispensing device can include fluidic actuators that when activated cause dispensing (e.g., ejection or other flow) of a fluid. For example, the dispensing of the fluid can include ejection of fluid droplets by activated fluidic actuators from respective nozzles of the fluid dispensing device. In other examples, an activated fluidic actuator (such as a pump) can cause fluid to flow through a fluid conduit or fluid chamber. Activating a fluidic actuator to dispense fluid can thus refer to activating the fluidic actuator to eject fluid from a nozzle or activating the fluidic actuator to cause a flow of fluid through a flow structure, such as a flow conduit, a fluid chamber, and so forth.

[0009] Activating a fluidic actuator can also be referred to as firing the fluidic actuator. In some examples, the fluidic actuators include thermal-based fluidic actuators including heating elements, such as resistive heaters. When a heating element is activated, the heating element produces heat that can cause vaporization of a fluid to cause nucleation of a vapor bubble (e.g., a steam bubble) proximate the thermal-based fluidic actuator that in turn causes dispensing of a quantity of fluid, such as ejection from an orifice of a nozzle or flow through a fluid conduit or fluid chamber. In other examples, a fluidic actuator may be a piezoelectric membrane based fluidic actuator that when activated applies a mechanical force to dispense a quantity of fluid.

[0010] In examples where a fluid dispensing device includes nozzles, each nozzle includes a fluid chamber, also referred to as a firing chamber. In addition, a nozzle can include an orifice through which fluid is dispensed, a fluidic actuator, and possibly a sensor. Each fluid chamber provides the fluid to be dispensed by the respective nozzle. In other examples, a fluid dispensing device can include a microfluidic pump that has a fluid chamber.

[0011 ] Generally, a fluidic actuator can be an ejecting-type fluidic actuator to cause ejection of a fluid, such as through an orifice of a nozzle, or a non-ejecting- type fluidic actuator to cause displacement of a fluid. [0012] In some examples, a fluid dispensing device can include a fluidic die. A “die” refers to an assembly where various layers are formed onto a substrate to fabricate circuitry, fluid chambers, and fluid conduits. Multiple fluidic dies can be mounted or attached to a support structure. In other examples, a fluidic die can be in the form of a fluidic die sliver, which includes a thin substrate (e.g., having a thickness on the order of 650 micrometers (pm) or less) with a ratio of length to width (L/W) of at least three, for example. A die sliver can have other dimensions in other examples. Multiple fluidic die slivers can be molded into a monolithic molding structure, for example.

[0013] In some examples, a fluidic die can include a printhead die, which can be mounted to a print cartridge, a carriage assembly, and so forth. A printhead die includes nozzles through which a printing liquid (e.g., an ink, a liquid agent used in a 3D printing system, etc.) can be dispensed towards a target (e.g., a print medium such as a paper sheet, a transparency foil, a fabric, etc., or a print bed including 3D parts being formed by a 3D printing system to build a 3D object).

[0014] A fluidic die such as a printhead die can be arranged on a body of a fluid dispensing device, such as a print cartridge, a print bar, or any other structure used for dispensing a fluid. The fluidic die is provided at an outer surface of the fluid dispensing device body so that nozzles of the fluidic die are exposed, to allow the nozzles of the fluidic die to dispense fluid towards a target.

[0015] The fluid dispensing device body can include various components, including fluid chambers to contain a fluid, fluid paths to fluidically transfer a fluid between different parts of the fluid dispensing device, and other fluidic components. The fluid dispensing device body can also include electrical circuitry that allows for electrical interaction between the fluidic die and an external system controller through an electrical interface mounted to the fluid dispensing device body. In some examples, the fluid dispensing device body can also include an air volume or bag to help maintain a fluidic pressure of the fluid dispensing device. The air volume or bag can be part of a flexible container that allows air in the flexible container to cause expansion or deflation of the flexible container as part of pressure regulation in the fluid dispensing device body. In other examples, the air volume or bag can be omitted.

[0016] In some examples, a fluid delivery system is used to deliver fluid to the fluid dispensing device. The fluid delivery system circulates the fluid from a fluid source through the fluid dispensing device. Any fluid provided into the fluid dispensing device but is not dispensed by the fluid dispensing device is returned by the fluid delivery system to the fluid source. The fluid delivery system is effectively a fluid recirculation system that circulates the fluid from the fluid source through the fluid dispensing device and back to the fluid source.

[0017] A pressure sensor can be used to detect a fluidic pressure of the fluid dispensing device. In some examples, measurement data from the pressure sensor is used to indicate a backpressure of the fluid dispensing device. The “backpressure” of the fluid dispensing device is the pressure difference between an ambient pressure (e.g., atmospheric pressure) surrounding the fluid dispensing device, and an internal pressure of the fluid inside the body of the fluid dispensing device.

[0018] The backpressure is maintained within a target pressure range. If the backpressure is too low, then fluid in the fluid dispensing device may leak out of the nozzles of the fluid dispensing device (a phenomenon also referred to as fluid drooling). If the backpressure is too high, then that may interfere with the dispensing of fluid from the nozzles of the fluid dispensing device. A higher backpressure can lead to the volume of fluid droplets dispensed by the fluid dispensing device being decreased, which can affect the perceived quality of a printed image in examples where the fluid dispensing device is used in a printing system.

[0019] A controller can use the measurement data from the pressure sensor to control valves of the fluid delivery system. The control of the valves can be part of a proportional-integral-derivative (PID) control loop performed by the controller based on the measurement data from the pressure sensor. Adjustment of the valves causes an adjustment of fluid flow into or out of the fluid dispensing device. This in turn can be used to control the amount of backpressure of the fluid dispensing device.

[0020] The pressure sensor monitors local pressure changes that result from flow rate changes in the fluid delivery system. In an example, flow rate changes can result from a sudden start or stop of high density regions of an image being printed. The PID control loop is a reactive control loop that reacts to measured fluidic pressures. However, the PID control loop may not react fast enough to avoid fluctuations in the backpressure due to sudden changes in the amount of fluid being dispensed by the nozzles of the fluid dispensing device. The fluctuations in the backpressure can either cause fluid drool from the fluid dispensing device, or cause reduced volumes of fluid being dispensed.

[0021] In accordance with some implementations of the present disclosure, a controller is able to use print data to anticipate an expected change in a pressure drop or an expected change in a density of dispensed fluid. Based on the expected change derived from the print data, the controller can adjust electrically-activated valves that are part of the body of a fluid dispensing device, to maintain the backpressure of the fluid dispensing device within a target range.

[0022] Figure 1 is a block diagram of an example fluid dispensing system 100 that includes a fluid dispensing device 102 fluidically coupled to a fluid delivery system 104. The fluid dispensing device 102 in some examples can be removably mounted in the fluid dispensing system 100. For example, if the fluid dispensing system 100 is a 2D printing system or a 3D printing system, the fluid dispensing device 102 can include a print cartridge that can be removably mounted to a mounting structure of the fluid dispensing system 100. The mounting structure can include a carriage (not shown) or any other type of mounting structure.

[0023] In other examples, the fluid dispensing device 102 can be fixedly mounted in the fluid dispensing system 100. [0024] In further examples, the fluid dispensing system 100 can be a different type of fluid dispensing system, such as a fluid sensing system, a medical system, a vehicle, a fluid flow control system, and so forth.

[0025] The fluid delivery system 104 includes a fluid source 106, which contains a fluid 108 that is to be delivered to the fluid dispensing device 102. For example, in a printing system, the fluid source 106 can include an ink reservoir or a reservoir of another type of printing liquid. The fluid delivery system 104 further includes a pump 110, which can pump the fluid 108 from the fluid source 106 through an ingress fluid path 112 of the fluid delivery system 104 to deliver the fluid to the fluid dispensing device 102. After the fluid has been delivered into the fluid dispensing device 102, any unused fluid is returned through an egress fluid path 114 of the fluid delivery system 104 from the fluid dispensing device 102 back to the fluid source 106. For simplicity, intervening components such as filters or other types of components in the fluid delivery system 104 are not shown.

[0026] The ingress fluid path 112 and the egress fluid path 114 can be implemented using any of various different fluid conduits, including pipes, tubes, and so forth.

[0027] The fluid delivery system 104 is a recirculation system in that the fluid delivery system 104 circulates fluid from the fluid source 106 through the fluid dispensing device 102 along the various fluid paths, and any remaining fluid is circulated back to the fluid source 106.

[0028] The fluid dispensing device 102 includes a fluidic die 116. In a printing system, the fluidic die 116 is a printhead die. The fluidic die 116 is provided at an outer surface 118 of a body 103 of the fluid dispensing device 102, such that nozzles 120 of the fluidic die 116 are exposed to allow fluid to be dispensed from the nozzles 120 when the nozzles are activated.

[0029] The body 103 of the fluid dispensing device 102 is defined by a housing of the fluid dispensing device 102. For example, if the fluid dispensing device 102 is a print cartridge, then the body 103 is the body of the print cartridge defined by the outer housing of the print cartridge.

[0030] The fluid dispensing device 102 includes an internal fluid chamber 122. Although the fluid chamber 122 is shown as being outside of the fluidic die 116, it is noted that in other examples, the fluid chamber 122 can be inside the fluidic die 116. Moreover, there can be multiple fluid chambers inside the fluid dispensing device body 103.

[0031] In accordance some implementations of the present disclosure, the fluid dispensing device 102 further includes valves 124 and 126 arranged in the fluid dispensing device body 103.

[0032] A "valve" refers to any fluid flow control element that is able to allow fluid to flow through the valve when the valve is in an open state, and to block fluid flow through the valve when the valve is in a closed state. In some examples, the valve can have multiple different open states that allow respective different amounts of fluid flow through the valve.

[0033] The valves 124 and 126 are electrically-activated valves that can be actuated between an open state and a closed state based on a respective electrical control signal. An example of an electrically-activated valve includes a solenoid valve. In other examples, other types of electrically-activated valves can be used.

[0034] Different states of the control signal can cause the valve to be set at respective different states. More generally, a valve is controlled by a control indication, which can include a signal, or more generally, can include any control information, which can include a bit, multiple bits, a message, an information element, and so forth. The control signal can be an analog control signal or a digital control signal.

[0035] The valve 124 is an inlet valve that controls ingress of the fluid from the ingress fluid path 112 of the fluid delivery system 104 into the fluid dispensing device 102. The valve 126 is an outlet valve that controls fluid exiting from the fluid dispensing device 102 to the egress fluid path 114 of the fluid delivery system 104.

[0036] When the inlet valve 124 is open, fluid can flow from the ingress fluid path 112 through the valve 124 and an internal fluid channel 130 to the fluid chamber 122. When the outlet valve 126 is open, fluid is transported from the fluid chamber 122 through another internal fluid channel 132 and the outlet valve 126 to the egress fluid path 114.

[0037] The fluid chamber 122 is in communication with the fluidic die 116, to allow for fluid in the fluid chamber 122 to flow into the fluidic die 116 to be ejected from activated nozzles 120 of the fluidic die 116.

[0038] Although just two valves 124 and 126 are shown in the example of Figure 1 , it is noted that in other examples, the fluid dispensing device 102 can include more than two valves. Also, in some examples, one of the valves 124 and 126 can be included in the fluid dispensing device body 103, while another of the valves 124 and 126 can be outside of the fluid dispensing device body 103. Such valve that is outside the fluid dispensing device body 103 can be included in a fluid path (e.g.,

112 or 114) of the fluid delivery system 104.

[0039] In further implementations of the present disclosure, the fluid dispensing device 102 also includes a sensor 128 in the fluid dispensing device body 103. The sensor 128 is a fluidic sensor to measure a fluid pressure inside the fluid dispensing device body 103. Although just one sensor 128 is shown in Figure 1, it is noted that in other examples, more than one sensor 128 can be provided to measure fluidic pressures at a location or multiple locations inside the fluid dispensing device body

103. For example, if the fluid dispensing device 102 has multiple fluidic dies, or the fluidic die 116 is relatively wide, then multiple sensors can be provided to measure fluidic pressures at multiple locations in the fluid dispensing device body 103. As another example, one pressure sensor can be used to measure fluidic pressure at a location where fluid enters the fluidic die 116, and another pressure sensor can be used to measure fluidic pressure at a location where fluid exits the fluidic die 116. Other example configurations with multiple pressure sensors can be used in other examples.

[0040] In other examples, the sensor 128 can be located outside of the fluid dispensing device body 103. In examples where the sensor 128 is in the fluid dispensing device body 103, the sensor 128 can be used to monitor a fluidic pressure of the fluid chamber 122, or of another fluid chamber or fluid channel. The sensor 128 can alternatively be used to monitor a fluidic pressure of a fluid chamber or fluid channel inside the fluidic die 116.

[0041 ] In examples where the sensor 128 is external of the fluid dispensing device body 103, the sensor 128 can be used to monitor a fluidic pressure of a fluid path (e.g., 112, 114) at a location close to the fluid dispensing device 102.

[0042] In accordance with some implementations of the present disclosure, pressure measurement data acquired by the sensor 128 is communicated over a signal path 134 to a fluid pressure controller 136. The signal path 134 can include an electrical conductive line or multiple conductive lines. Alternatively, the signal path 134 can include a wireless signal path.

[0043] As used here, a “controller” can refer to a hardware processing circuit, which can include any or some combination of a microprocessor, a core of a multi core microprocessor, a microcontroller, a programmable integrated circuit, a programmable gate array, a digital signal processor, or another hardware processing circuit. Alternatively, a “controller” can refer to a combination of a hardware processing circuit and machine-readable instructions (software and/or firmware) executable on the hardware processing circuit.

[0044] The pressure measurement data can be used by the fluid pressure controller 136 to determine a backpressure experienced by the fluid dispensing device 102. The backpressure refers to the difference in pressure between an ambient pressure that is outside the fluid dispensing device body 103 and the pressure inside the fluid dispensing device body 103 (e.g., inside the internal fluid chamber 122).

[0045] The fluid pressure controller 136 is also able to provide valve control signals over (wired or wireless) signal paths 138 and 140, respectively, to the respective valves 124 and 126. The control signal provided over a respective signal path 138 or 140 to each respective valve 124 or 126 is to control actuation of the valve 124 or 126 between different states.

[0046] In accordance with some implementations of the present disclosure, the fluid pressure controller 136 receives fluid dispensing control data 142. In examples where the fluid dispensing system 100 is a printing system, the fluid dispensing control data 142 includes print data that defines an image to be produced by a printing liquid dispensed by the nozzles 120 of the fluidic die 116. The fluid pressure controller 136 is able to determine, based on the fluid dispensing control data 142, an expected pressure drop at the fluid dispensing device 102, or to determine a density of activated nozzles of the fluid dispensing device 102.

[0047] A pressure drop at the fluid dispensing device 102 can refer to the backpressure of the fluid dispensing device 102, for example. A density of activated nozzles can refer to how many of the nozzles of the fluidic die 116 are to be activated. Note that the expected pressure drop or the expected density of activated nozzles can be determined over a specified time interval, in which case the expected pressure drop can be an average (or other aggregate) pressure drop of multiple pressure drops at respective time points in the specified time interval, or the expected density of activated nozzles can be an average (or other aggregate) expected density of activated nozzles of multiple expected densities of activated nozzles at respective time points in the specified time interval.

[0048] Based on the fluid dispensing control data 142, the fluid pressure controller 136 can anticipate an expected pressure drop or an expected density of activated nozzles that differs from a current pressure drop or current density of activated nozzles by some specified threshold. In such a scenario, the fluid pressure controller 136 is able to control the inlet valve 124 and/or the outlet valve 126 to compensate for the expected large difference in pressure drop or density of activated nozzles. The control of the inlet valve 124 and/or the outlet valve 126 based on fluid dispensing control data 142 causes adjustment of fluid flow circulation in the recirculation system (fluid delivery system 104) to control a fluidic pressure (backpressure) of the fluid dispensing device 102.

[0049] Figure 1 also shows a fluid dispensing controller 144, which controls operation of a fluidic die 116. In a printing system, the fluid dispensing controller 140 is a print controller to control ejection of printing liquids by the fluidic die 116 through the nozzles 120 during a printing operation. The fluid dispensing controller 144 sends control signals over a (wired or wireless) signal path 146 to control which nozzles 120 of the fluidic die 116 are activated to eject a printing liquid to form a target image defined by the print data received by the print controller.

[0050] Although Figure 1 shows use of two distinct controllers 136 and 144, in other examples, the controllers 136 and 144 can be integrated into the same controller.

[0051] As noted above, in some examples, the fluid pressure controller 136 is able to control the inlet valve 124 and/or the outlet valve 126 to compensate for the expected large difference in pressure drop or density of activated nozzles. For example, a lookup table or other correlation information can be used to correlate different densities of activated nozzles to corresponding different flows as controlled by the inlet valve 124 and the outlet valve 126.

[0052] A flow rate of the fluid dispensing device 102 can be controlled based on relative settings of the inlet valve 124 and the outlet valve 126. For example, the inlet valve 124 and the outlet valve 126 can be controlled to increase fluid flow into the fluid dispensing device 102 responsive to the fluid dispensing control data 142 indicating an expected increase in dispensing of fluid by the fluid dispensing device 102. As a further example, the inlet valve 124 and the outlet valve 126 can be controlled to increase fluid flow out of the fluid dispensing device 102 responsive to the fluid dispensing control data 142 indicating an expected decrease in dispensing of fluid by the fluid dispensing device 102.

[0053] The lookup table or other correlation information can be populated with data based on characterization of the fluid dispensing system 100 during manufacture or during use. The characterization can include running tests of the fluid dispensing system 100 in which different patterns of activations of the nozzles 120 of the fluidic die 116 are applied, and the sensor 128 is used to measure fluidic pressures in response to the different patterns of nozzle activations. Moreover, during the tests, different flow rates can be applied based on control of the inlet valve 124 and the outlet valve 126. The effect of the different flow rates on the pressure sensed by the sensor 128 can be recorded to determine which flow rates are effective in maintaining the backpressure of the fluid dispensing device 102 within a target range under different patterns of nozzle activations. The settings of the valves 124 and 126 that correspond to the flow rates identified as being effective can be stored in the lookup table or other correlation information in association with a corresponding density of nozzle activations.

[0054] In other examples, instead of using a lookup table or other correlation information, a formula can be used instead. The formula can be based on fitting test data (e.g., a polynomial fit or other type of data fit) collected during characterization of the fluid dispensing system 100. For example, the formula can receive as input a rate of change in the print data density, the rate of pressure change expected from the latencies of activating the valves 124 and 126, the inertia of the fluid, and other factors such as temperature and so forth, and produce respective settings of the valves 124 and 126 that can be used by the fluid pressure controller 136 to control the valves 124 and 126.

[0055] The fluid pressure controller 136 controls the valves 124 and 126 further based on pressure measurement data from the sensor 128. The pressure measurement data provides an indication of the current backpressure experienced by the fluid dispensing device 102. Given the current backpressure, the fluid pressure controller 136 can determine, based on the fluid dispensing control data 142, how to adjust the valves 124 and 126 to account for changes in the backpressure due to the change in pressure drop or change in nozzle activation density.

[0056] Figure 2 is a block diagram of a non-transitory machine-readable or computer-readable storage medium 200 storing machine-readable instructions that upon execution cause a controller to perform various tasks. The machine-readable instructions include print data based fluid dispensing device valve control instructions 202 to control, based on fluid dispensing control data (e.g., 142 in Figure 1), an electrically-activated valve (124 and/or 126 of Figure 1 ) that is part of a body of a fluid dispensing device, where the control of the electrically-activated valve is to cause adjustment of fluid flow circulation in a recirculation system to control a fluidic pressure of the fluid dispensing device.

[0057] Figure 3 is a block diagram of a fluid dispensing device 302 that includes a body 304 and an array of nozzles 306 arranged in the body 304. The fluid dispensing device 302 further includes an electrically-activated valve 308 in the body 304, where the electrically-activated valve 308 is controllable to adjust fluid flow into or out of the body 304.

[0058] Figure 4 is a flow diagram of a process 400 that can be performed by a controller (e.g., the fluid pressure controller 136). The process 400 includes receiving (at 402) fluid dispensing control data that controls dispensing of fluid from nozzles arranged on a body of a fluid dispensing device.

[0059] The process 400 further includes controlling (at 404), based on the fluid dispensing control data, an electrically-activated valve that is part of the body of the fluid dispensing device, the controlling of the electrically-activated valve causing adjustment of fluid flow circulation in a recirculation system that controls a fluidic pressure of the fluid dispensing device.

[0060] In the foregoing description, numerous details are set forth to provide an understanding of the subject disclosed herein. Flowever, implementations may be practiced without some of these details. Other implementations may include modifications and variations from the details discussed above. It is intended that the appended claims cover such modifications and variations.

[0061] In the present disclosure, use of the term “a,” “an”, or “the” is intended to include the plural forms as well, unless the context clearly indicates otherwise. Also, the term “includes,” “including,” “comprises,” “comprising,” “have,” or “having” when used in this disclosure specifies the presence of the stated elements, but do not preclude the presence or addition of other elements.

Claims

What is claimed is:

1. A non-transitory machine-readable storage medium comprising instructions that upon execution cause a controller to: control, based on fluid dispensing control data, an electrically-activated valve that is part of a body of a fluid dispensing device, the control of the electrically- activated valve to cause adjustment of fluid flow circulation in a recirculation system to control a fluidic pressure of the fluid dispensing device.

2. The non-transitory machine-readable storage medium of claim 1 , wherein the instructions upon execution cause the controller to: determine, based on the fluid dispensing control data, an expected pressure drop at the fluid dispensing device, wherein the control of the electrically-activated valve is based on the expected pressure drop.

3. The non-transitory machine-readable storage medium of claim 1 , wherein the instructions upon execution cause the controller to: determine, based on the fluid dispensing control data, an expected density of activated nozzles of the fluid dispensing device, wherein the control of the electrically-activated valve is based on the expected density of activated nozzles.

4. The non-transitory machine-readable storage medium of claim 3, wherein the instructions are to cause the controller to determine the expected density of activated nozzles of the fluid dispensing device in a specified time interval.

5. The non-transitory machine-readable storage medium of claim 1 , wherein the electrically-activated valve is an electrically-activated inlet valve to control fluid flow into the fluid dispensing device from the recirculation system, and wherein the instructions that upon execution cause the controller to further: control, based on the fluid dispensing control data, an electrically-activated outlet valve that is part of the body of the fluid dispensing device, the electrically- activated outlet valve to control fluid flow out of the fluid dispensing device to the recirculation system.

6. The non-transitory machine-readable storage medium of claim 5, wherein the control of the electrically-activated inlet valve and the control of the electrically- activated outlet valve adjust the electrically-activated inlet valve and the electrically- activated outlet valve to increase fluid flow into the fluid dispensing device responsive to the fluid dispensing control data indicating an expected increase in dispensing of fluid by the fluid dispensing device.

7. The non-transitory machine-readable storage medium of claim 6, wherein the fluid dispensing control data comprises print data, and wherein the expected increase in dispensing of fluid by the fluid dispensing device is indicated by a greater density of an image to be printed based on the print data.

8. The non-transitory machine-readable storage medium of claim 5, wherein the control of the electrically-activated inlet valve and the control of the electrically- activated outlet valve adjust the electrically-activated inlet valve and the electrically- activated outlet valve to increase fluid flow out of the fluid dispensing device responsive to the fluid dispensing control data indicating an expected decrease in dispensing of fluid by the fluid dispensing device.

9. The non-transitory machine-readable storage medium of claim 8, wherein the fluid dispensing control data comprises print data, and wherein the expected decrease in dispensing of fluid by the fluid dispensing device is indicated by a lower density of an image to be printed based on the print data.

10. The non-transitory machine-readable storage medium of claim 1 , wherein the instructions upon execution cause the controller to: receive measurement data from a pressure sensor that measures the fluidic pressure of the fluid dispensing device, wherein the control of the electrically-activated valve is further based on the measurement data from the pressure sensor.

11. The non-transitory machine-readable storage medium of claim 10, wherein the measurement data is from the pressure sensor that is part of the body of the fluid dispensing device.

12. A fluid dispensing device comprising: a body; an array of nozzles arranged in the body; and an electrically-activated valve in the body, the electrically-activated valve controllable to adjust fluid flow into or out of the body.

13. The fluid dispensing device of claim 12, wherein the electrically-activated valve is controllable to adjust the fluid flow into or out of the body based on print data that controls dispensing of fluid from the array of nozzles.

14. A method of a controller, comprising: receiving fluid dispensing control data that controls dispensing of fluid from nozzles arranged on a body of a fluid dispensing device; and controlling, based on the fluid dispensing control data, an electrically-activated valve that is part of the body of the fluid dispensing device, the controlling of the electrically-activated valve causing adjustment of fluid flow circulation in a recirculation system that controls a fluidic pressure of the fluid dispensing device.

15. The method of claim 14, wherein the electrically-activated valve is an electrically-activated inlet valve that controls fluid flow into the fluid dispensing device from the recirculation system, and wherein the method further comprises: controlling, based on the fluid dispensing control data, an electrically-activated outlet valve that is part of the body of the fluid dispensing device, the electrically- activated outlet valve controlling fluid flow out of the fluid dispensing device to the recirculation system.