PWM variable sprinkler pre-valve signal integration system and apparatus

Abstract

The application provides a PWM variable sprinkling irrigation machine valve front signal integrated system and equipment, and comprises a tower car controller, a two-choice chip, a driving chip and an electromagnetic valve; the output end of the tower car controller is connected with the input pin of the two-choice chip, and the tower car controller sends a signal of a program-controlled on-off valve through an output port; the input end of the driving chip is connected with the output pin of the two-choice chip, the output end of the driving chip is connected with the input end of the electromagnetic valve, and the driving chip is used for improving driving capacity and simultaneously completing signal high-low level inversion; when the input end of the electromagnetic valve is a low level, the driving circuit inside the electromagnetic valve will open the valve to water, otherwise the water valve is closed. The application can complete complex signal integration through a single multiplexer, can support distributed overall program control in normal working condition, and can also support single tower car on-site manual control scene.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a PWM variable sprinkler irrigation machine valve pre-valve signal integration system and equipment. Background Technology

[0002] Pulse Width Modulation (PWM) variable irrigation refers to installing electromagnetic water valves in front of each sprinkler head of the irrigation machine. By adjusting the duty cycle of the electromagnetic water valves within one opening and closing cycle, the irrigation volume is precisely controlled, enabling variable irrigation in both the traveling and truss directions. Variable irrigation machines typically have 3-10 spans, each span being 50 to 100 meters. Due to the large number of electromagnetic water valves and their wide span arrangement, a hierarchical distributed control method is often used. This involves setting up a main controller and tower car controllers on each tower car, assigning each water valve to the corresponding tower car controller based on its location. Each tower car controller needs to generate 16-24 PWM signals.

[0003] Regardless of the microprocessor chosen for the tower crane controller, each of its general-purpose input / output (GPIO) pins can sink or provide a maximum current of Ipin, but the total current of Nport pins on a single port is only Iport. Generally, Ipin * Nport > Iport. For applications where the tower crane controller needs to generate multiple parallel PWM signals, the pin output capability must be Iport / Nport. For example, with an STM32F103R8, Ipin = 8mA, Iport = 25mA, and Nport = 8. In this case, Iport / Nport = 3.125mA. Since the photoelectric or electromagnetically coupled isolated input trigger current driving the solenoid water valve is typically in the 15mA range, the programmable PWM signal emitted from the tower crane controller's ports must be amplified by a pre-amplifier to start and stop the solenoid water valve.

[0004] In addition to the independent program-controlled (i.e., program-controlled) switching valves of each channel during normal operation of the sprinkler irrigation machine, due to the large size of the sprinkler irrigation machine, it is necessary to check the valve position and debug it before the distributed control is integrated, and to manually control the switching of the valves corresponding to each tower truck during the equipment maintenance before the busy farming season, as well as to close the valves corresponding to the overall emergency stop during the process.

[0005] Patent document CN203087142U (application number: CN201320064378.9) discloses a remote intelligent control system for a center-pivot sprinkler irrigation machine, applicable to intelligent industrial control operations of center-pivot sprinkler irrigation machines. The system includes an independently set remote control terminal and a remote control module, a central controller, and a tower unit controller integrated on the sprinkler irrigation machine. The remote control terminal communicates with the remote control module via wireless signals, the remote control module communicates with the signal input terminal of the central controller, the signal output terminal of the central controller communicates with the tower unit controller, and the tower unit controller is electrically connected to the sprinkler irrigation machine's working system. However, this patent cannot solve the existing technical problems and cannot meet the needs of this invention. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the purpose of this invention is to provide a PWM variable sprinkler system with integrated valve pre-valve signals and equipment.

[0007] The PWM variable sprinkler pre-valve signal integration system provided by the present invention includes: a tower truck controller, a two-to-one multiplexer chip, a driver chip, and a solenoid valve;

[0008] The output terminal of the tower crane controller is connected to the input pin of the two-to-one multiplexer chip, and the tower crane controller sends a signal to the programmable switch valve through the output port;

[0009] The input terminal of the driver chip is connected to the output pin of the 2-to-1 multiplexer chip, and the output terminal of the driver chip is connected to the input terminal of the solenoid valve. The driver chip is used to improve the driving capability and simultaneously invert the high and low levels of the signal.

[0010] When the input terminal of the solenoid valve is at a low level, the internal drive circuit of the solenoid valve will open the valve to allow water to flow; otherwise, it will close the water valve.

[0011] Preferably, the two signal input pins of the two-to-one chip are respectively connected to the programmable switch valve signal and the manual switch valve signal; the select signal pin of the two-to-one chip is connected to the programmable / manual switch signal to realize the switching between programmable switch valve signal and manual switch valve signal control; the enable pin of the two-to-one chip is connected to the emergency stop signal to close the water valve in both programmable and manual control modes.

[0012] Preferably, the two signal input pins refer to signal pins A and B of the 2-to-1 multiplexer, the selection signal pin refers to the Select A- / B pin of the 2-to-1 multiplexer, and the enable pin refers to the Enable G- pin of the 2-to-1 multiplexer.

[0013] The function of the 2-to-1 multiplexer is that when Enable is low and Select A- / B is low, the chip outputs signal Y at the same level as signal A; when Select A- / B is high, the chip outputs signal Y at the same level as signal B; when Enable is high, the chip outputs signal Y at a low level.

[0014] Preferably, the valve inlet signals of all valves corresponding to the tower crane are integrated and share the same emergency stop signal; the valve inlet signals of all valves corresponding to the tower crane are integrated and share the same programmable manual switching signal; the valve inlet signals of multiple valves corresponding to the tower crane are integrated and share the same manual valve switching signal or are set to their own independent switches.

[0015] Preferably, the driver chip is a multi-channel packaged driver chip that can provide 20mA.

[0016] Preferably, a 4-channel packaged 74ls157 is used as a 2-to-1 multiplexer chip, and an 8-channel packaged NPN Darlington transistor driver chip ULN2803 is used for drive amplification; 4 74ls157 chips and 2 ULN2803 chips are used to integrate the pre-valve signals of 16 valves, and 6 74ls157 chips and 3 ULN2803 chips are used to integrate the pre-valve signals of 24 valves.

[0017] Preferably, when the emergency stop signal is high, because it is connected to the enable pin of the two-to-one chip, the output of the two-to-one chip is low, and after passing through the driver chip, it outputs a high level to the solenoid valve, and the water valve closes.

[0018] Preferably, when the emergency stop signal is low and the programmable / manual switching signal is low, the output of the two-to-one chip is consistent with the programmable switching valve signal;

[0019] If the programmable switch valve signal is low at this time, the output of the two-to-one chip will be low, and after passing through the driver chip, it will output a high level to the solenoid valve, and the water valve will close.

[0020] If the programmable switch valve signal is high at this time, the output of the two-to-one chip will be high, and after passing through the driver chip, it will output a high level to the solenoid valve, thus opening the water valve.

[0021] Preferably, when the emergency stop signal is low and the programmable / manual switching signal is high, the output of the two-to-one multiplexer chip is consistent with the programmable / manual switching signal of the manual valve;

[0022] If the manual valve switch signal is low at this time, the output of the two-to-one chip will be low, and after passing through the driver chip, it will output a high level to the solenoid valve, and the water valve will be closed.

[0023] If the manual valve switch signal is high at this time, the output of the two-to-one chip will be high, and after passing through the driver chip, it will output a high level to the solenoid valve, thus opening the water valve.

[0024] The PWM variable sprinkler valve inlet signal integration device provided by the present invention includes: a controller;

[0025] The controller includes the PWM variable sprinkler valve pre-valve signal integration system.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The control state switching between programmable and manual is achieved by switching the signal of the multiplexer. The emergency stop function is completed by loading the emergency stop signal on the enable input of the multiplexer. That is, a relatively complex signal integration is completed by a single multiplexer. It can support distributed overall programmable control during normal operation, and also supports manual control of a single tower car on site.

[0028] (2) The insufficient port current capability caused by the parallel working scale effect when controlling multiple electromagnetic water valves at the same time is solved by the driver chip. Attached Figure Description

[0029] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the signal connections in the integrated driving method for the switching solenoid water valves before each sprinkler head of the PWM variable sprinkler machine in this invention.

[0031] Figure 2 This describes the signal operation logic in the integrated driving method for the switching solenoid water valves before each sprinkler head of the PWM variable sprinkler in this invention. Detailed Implementation

[0032] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0033] Example:

[0034] This invention provides a method for integrating pre-valve signals of a PWM variable sprinkler to achieve information integration of programmable control, manual control, and emergency stop in the PWM variable sprinkler, in order to meet the needs of different working scenarios.

[0035] like Figure 1 This invention employs an enabled 2-to-1 multiplexer and a driver chip to amplify the pre-valve signal driving capability and integrate the signal functions of the PWM variable sprinkler.

[0036] The tower crane controller program sends a signal to the programmable valve via the output port, which becomes the integrated external input of this invention. Specifically, it is connected to the A signal pin of the 2-to-1 chip.

[0037] The driver chip is a component of this invention, used to improve driving capability and also to invert signal high and low levels. Its input is connected to the output pin Y of a 2-to-1 multiplexer chip, and its output is connected to the input of a solenoid valve.

[0038] The solenoid valve receives the final output of this invention. When its input is low, the internal drive circuit of the solenoid valve will open the valve to allow water to flow.

[0039] In the 2-to-1 multiplexer, the two signal input pins are connected to the programmable valve switching signal and the manual valve switching signal, respectively; the selection signal pin is connected to the programmable / manual switching signal to switch between programmable and manual valve switching signals; the enable pin is connected to the emergency stop signal, so that the valve is closed regardless of whether it is in programmable or manual control mode.

[0040] The two signal input pins refer to signal pins A and B of the 2-to-1 multiplexer chip. The select signal pins refer to the Select A- / B pins of the 2-to-1 multiplexer chip, and the enable pin refers to the Enable (G-) pin of the 2-to-1 multiplexer chip.

[0041] The function of the 2-to-1 chip is that when Enable is low and Select A- / B is low, the chip output signal Y is at the same level as signal A; when Select A- / B is high, the chip output signal Y is at the same level as signal B; when Enable is high, the chip output signal Y is low and is independent of the other three input pins.

[0042] All valves corresponding to the tower crane share the same emergency stop signal.

[0043] All valves corresponding to the tower crane share the same pre-valve signals via a single programmable manual switching signal.

[0044] The valve pre-signing signals of the N valves corresponding to the tower crane can be integrated and can share the same manual switch valve signal or be set to have their own independent switches.

[0045] The driver chip can be a multi-channel packaged driver chip that can provide 20mA.

[0046] In specific examples, a 4-channel 74LS157 can be used as a 2-to-1 multiplexer, and an 8-channel NPN Darlington transistor driver chip ULN2803 can be used for drive amplification. Four 74LS157 chips and two ULN2803 chips can be used to integrate the pre-valve signals for 16 valves, and six 74LS157 chips and three ULN2803 chips can be used to integrate the pre-valve signals for 24 valves.

[0047] like Figure 2 When the emergency stop signal is high (H), because it is connected to the enable pin of the 2-to-1 chip (i.e., Enable (G-) in the figure), the output of the 2-to-1 chip (i.e., Y in the figure) is low (L), and after passing through the driver chip, it outputs a high level (H) to the solenoid valve, and the water valve closes.

[0048] When the emergency stop signal is low (L) and the programmable / manual switching signal (connected to the Select pin of the 2-to-1 chip) is also low (L), the output of the 2-to-1 chip (i.e., Y in the diagram) matches the programmable switch valve signal (connected to pin A of the 2-to-1 chip). If the programmable switch valve signal is low (L), the output of the 2-to-1 chip is low (L), which, after passing through the driver chip, outputs a high level (H) to the solenoid valve, closing the water valve. If the programmable switch valve signal is high (H), the output of the 2-to-1 chip is high (H), which, after passing through the driver chip, outputs a high level (L) to the solenoid valve, opening the water valve.

[0049] When the emergency stop signal is low (L) and the programmable / manual switching signal (connected to the Select pin of the 2-to-1 chip) is high (H), the output of the 2-to-1 chip (i.e., Y in the diagram) is consistent with the manual valve switching signal programmable signal (connected to pin B of the 2-to-1 chip). If the manual valve switching signal is low (L) at this time, the output of the 2-to-1 chip is low (L), which, after passing through the driver chip, outputs a high level (H) to the solenoid valve, closing the water valve. If the manual valve switching signal is high (H) at this time, the output of the 2-to-1 chip is high (H), which, after passing through the driver chip, outputs a high level (L) to the solenoid valve, opening the water valve.

[0050] Those skilled in the art will understand that, in addition to implementing the system, apparatus, and their modules provided by this invention in purely computer-readable program code, the same program can be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system, apparatus, and their modules provided by this invention can be considered a hardware component, and the modules included therein for implementing various programs can also be considered structures within the hardware component; alternatively, modules for implementing various functions can be considered both software programs implementing the method and structures within the hardware component.

[0051] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A PWM variable sprinkler valve front signal integration system, characterized by, The utility model relates to a tower car control system, including: Tower car controller, two -way chip, drive chip and solenoid valve; The output end of the tower car controller is connected to the input pin of the two -way chip, and the tower car controller sends the signal of the program control switch valve through the output port; The input end of the drive chip is connected to the output pin of the two -way chip, and the output end of the drive chip is connected to the input end of the solenoid valve, which is used to improve the driving ability and complete the inversion of the signal high and low level; When the input end of the solenoid valve is low, the drive circuit inside the solenoid valve will open the water valve, otherwise the water valve will be closed; The two -way chip signal input pin is connected to the program control switch valve signal and the manual switch valve signal respectively;The select signal pin of the two -way chip is connected to the program control manual switching signal, realizing the switching control of the program control switch valve signal and the manual switch valve signal;The enable pin of the two -way chip is connected to the emergency stop signal, realizing the closing of the water valve in the program control and manual control state; The two -way signal input pin refers to the signal pin A and the signal pin B of the two -way chip, the select signal pin refers to the Select A- / B pin of the two -way chip, and the enable pin refers to the Enable G- pin of the two -way chip; The function of the two -way chip is that when the Enable is low, the Select A- / B is low, then the chip output signal Y is the same as the A signal, and when the Select A- / B is high, the chip output signal Y is the same as the B signal;When the Enable is high, the chip output signal Y is low; The valve front signal of all valves corresponding to the tower car is integrated with the same emergency stop signal;The valve front signal of all valves corresponding to the tower car is integrated with the same program control manual switching signal;The valve front signal of multiple valves corresponding to the tower car is integrated with the same manual switch valve signal or each valve is provided with a separate switch; When the emergency stop signal is high, the two -way chip output is low due to the connection of the enable pin, and the high level is output to the solenoid valve after the drive chip, and the water valve is closed.

2. The PWM variable sprinkler valve front signal integration system of claim 1, wherein, The drive chip selects a multi -channel packaged drive chip that can provide 20mA.

3. The PWM variable sprinkler valve front signal integration system of claim 1, wherein, The four -channel packaged 74ls157 is used as the two -way chip, the eight -channel packaged NPN darlington tube drive chip ULN2803 is used to realize the drive amplification, four 74ls157 chips and two ULN2803 chips are used to realize the integration of the valve front signal of 16 valves, and six 74ls157 chips and three ULN2803 chips are used to realize the integration of the valve front signal of 24 valves.

4. The PWM variable sprinkler valve front signal integration system of claim 1, wherein, When the emergency stop signal is low and the program control / manual switching signal is low, the output of the two -way chip is consistent with the program control switch valve signal; At this time, if the program control switch valve signal is low, the output of the two -way chip is low, and the high level is output to the solenoid valve after the drive chip, and the water valve is closed; At this time, if the program control switch valve signal is high, the output of the two -way chip is high, and the high level is output to the solenoid valve after the drive chip, and the water valve is opened.

5. The PWM variable sprinkler valve pre-signal integration system of claim 1, wherein, When the emergency stop signal is low and the program control / manual switching signal is high, the output of the two -way chip is consistent with the manual switch valve signal program control signal; If the manual switch valve signal is low at this time, the output of the multiplexer chip is low, and a high level is output to the electromagnetic valve after the driving chip, and the water valve is closed. If the manual switch valve signal is high at this time, the output of the multiplexer chip is high, and a high level is output to the electromagnetic valve after the driving chip, and the water valve is opened.

6. A PWM variable sprinkler valve front signal integration apparatus, comprising: Comprise: A controller; The controller comprises the PWM variable sprinkler valve front signal integration system in any one of claims 1 to 5.

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