NL2020917B1 - System for spraying an agricultural product - Google Patents

System for spraying an agricultural product Download PDF

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Publication number
NL2020917B1
NL2020917B1 NL2020917A NL2020917A NL2020917B1 NL 2020917 B1 NL2020917 B1 NL 2020917B1 NL 2020917 A NL2020917 A NL 2020917A NL 2020917 A NL2020917 A NL 2020917A NL 2020917 B1 NL2020917 B1 NL 2020917B1
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NL
Netherlands
Prior art keywords
coil
solenoid valve
plunger
controller
voltage
Prior art date
Application number
NL2020917A
Inventor
De Jonge Roelof
Original Assignee
Rdj Holding B V
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rdj Holding B V filed Critical Rdj Holding B V
Priority to NL2020917A priority Critical patent/NL2020917B1/en
Application granted granted Critical
Publication of NL2020917B1 publication Critical patent/NL2020917B1/en

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M7/00—Special adaptations or arrangements of liquid-spraying apparatus for purposes covered by this subclass
    • A01M7/0089—Regulating or controlling systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Insects & Arthropods (AREA)
  • Pest Control & Pesticides (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Fertilizing (AREA)
  • Catching Or Destruction (AREA)

Abstract

A system for spraying an agricultural product, such as a herbicide or a fertilizer, on a plant, crop or soil, the system comprising a solenoid valve arranged to control delivery of said agricultural product to said plant, crop or soil, wherein said solenoid valve comprises a coil and a plunger, wherein said plunger is moveably arranged in said coil between a first position wherein said solenoid valve is open and a second position wherein said solenoid valve is closed and a controller arranged to control opening and closing of said solenoid valve for delivery of an amount of agricultural product to said plant, crop or soil, wherein the controller is further arranged to determine movement of said plunger relative to said coil of said solenoid valve.

Description

Title: System for spraying an agricultural product
DESCRIPION
The present disclosure relates according to a first aspect to a system for spraying an agricultural product, such as a herbicide or a fertilizer, on a plant, crop or soil.
According to a second aspect the present disclosure relates to an agricultural vehicle comprising a system according to the first aspect of the present disclosure.
The system according to the first aspect comprises
- a solenoid valve arranged to control delivery of said agricultural product to said plant, crop or soil, wherein said solenoid valve comprises a coil and a plunger, wherein said plunger is moveably arranged in said coil between a first position wherein said solenoid valve is open and a second position wherein said solenoid valve is closed;
- a controller arranged to control opening and closing of said solenoid valve for delivery of an amount of agricultural product to said plant, crop or soil, wherein the controller is further arranged to determine movement of said plunger relative to said coil of said solenoid valve.
The system is arranged to deliver the agricultural product when the plunger of the solenoid valve is in the first position, wherein the solenoid valve is open and thereby allowing flow of the agricultural product via the solenoid valve to the plant crop or soil. In the second position, the solenoid valve is closed and the plunger is in the second position and blocks flow of agricultural product via the solenoid valve to the plant, crop or soil. By controlling movement of the plunger between the first position and the second position, by the controller, an amount of agricultural product may be dosed.
The controller is further arranged to determine movement of said plunger relative to said coil of said solenoid valve. Determining the movement of the plunger allows the system to more accurately determine and control the amount of the agricultural product delivered to the plant, crop or soil. Preferably, the determined movement of said plunger relative to said coil is taken into account to control opening and closing of said valve for delivery of the amount of agricultural product to said plant, crop or soil.
The present disclosure is at least partly based on the insight that for the delivery of a relative accurate amount, i.e. a desired amount, of agricultural product to a plant, crop or soil the flow of agricultural product via the solenoid valve, when said plunger is not in the first position may provide a relative large contribution to the amount delivered to the plant, crop or soil. In particular for a relative high switching frequency of the plunger between the first position and the second position for opening and closing the solenoid valve the contribution of delivery of the agricultural product while said plunger is no longer in the first position may be relatively large. By determining the movement of the plunger the amount of agricultural product that is delivered to the plant, crop or soil may be controlled more accurately. By taking into account the delivery of the agricultural product throughout a complete switching cycle of the solenoid valve, wherein a switching cycle comprises moving the plunger from the second position to the first position and subsequently moving the plunger from the first position back to the second position the amount of agricultural product that is delivered to the plant, crop or soil can be controlled in a relative accurate manner.
Preferably, the solenoid valve is coupled to a supply of agricultural product for instance via a tubing for flow of the agricultural product via said solenoid valve to said plant, crop or soil. Alternatively, the solenoid valve in an embodiment of the system is directly coupled to a container holding the agricultural product for flow of the agricultural product via said solenoid valve to said plant, crop or soil.
In an embodiment of the system according to the first aspect of the present disclosure an outlet of said solenoid valve is coupled for fluid flow with a nozzle for delivery of said agricultural product, by spraying, onto said plant, crop or soil. A nozzle is beneficial for spraying said agricultural product spatially in a relative accurate manner thereby controlling the amount of agricultural product that is delivered to the plant, crop or soil in a relative accurate manner.
In an embodiment of the system according to the first aspect of the present disclosure said solenoid valve is arranged to move said plunger relative to said coil when applying an operating voltage to said coil, wherein said controller is further arranged to detect a voltage change, preferably a voltage decay, across said coil after removing said operating voltage for determining said movement of said plunger relative to said coil of said solenoid valve. Detecting the voltage change after removal of the operating voltage is beneficial for increasing the accuracy of the delivery of the agricultural product. Preferably, the voltage change after removal of the operating voltage is a voltage decay, wherein the voltage across the coil of the solenoid valve decays to substantially zero Volt.
It is advantageous if said controller is further arranged to detect an induced voltage across said coil of said solenoid valve as a result of said movement of said plunger for determining said movement of said plunger relative to said coil of said solenoid valve. Detecting an induced voltage in the coil due to movement of the plunger relative to the coil is beneficial for determining and controlling the amount of agricultural product that is delivered to the plant, crop or soil in a relative accurate manner.
Preferably, the controller is arranged to detect the induced voltage in the coil when the plunger moves out of the first position and/or when the plunger stops moving after the operating voltage is removed from the coil of the solenoid valve. When the plunger moves out of the first position and starts to move relative to the coil, a relative strong induced voltage may be observed. When the plunger stops moving relative to the coil, a relative strong induced voltage may be observed.
In an embodiment of the system according to the first aspect of the present disclosure said controller is further arranged to derive a time duration for moving said plunger from said first position to said second position or for moving said plunger from said second position to said first position after removing said operating voltage from said coil taking into account said detected induced voltage across said coil. Determining said time duration is beneficial for determining and controlling the amount of agricultural product that is delivered to the plant, crop or soil in a relative accurate manner.
In an embodiment of the system according to the first aspect of the present disclosure said controller is further arranged to determine a time duration for said plunger to start to move relative to said coil after removing said operating voltage from said coil taking into account said detected induced voltage across said coil and/or wherein said controller is further arranged to determine a time duration for said plunger to stop moving relative to said coil after removing said operating voltage from said coil taking into account said detected induced voltage across said coil. Determining said time durations as a duration from a moment of removing said operating voltage is beneficial for taking into account a time delay between the moment of removing the operating voltage and the actual start or stop of the movement of the plunger relative to the coil. This is beneficial for determining and controlling the amount of agricultural product that is delivered to the plant, crop or soil in a relative accurate manner.
In an embodiment of the system according to the first aspect of the present disclosure said controller is further arranged to determine a time duration between a start of movement of said plunger relative to said coil and an end of movement of said plunger relative to said coil after removing said operating voltage from said coil taking into account said detected induced voltage across said coil. This is beneficial for determining and controlling the amount of agricultural product that is delivered to the plant, crop or soil in a relative accurate manner.
In an embodiment of the system according to the first aspect of the present disclosure said system comprises reference data related to said movement of said plunger relative to said coil of said valve, wherein said controller is further arranged to compare said detected voltage change across said coil after removing said operating voltage and/or said induced voltage across said coil with said reference data to determine an actual condition of said solenoid valve. This is beneficial for determining and controlling the amount of agricultural product that is delivered to the plant, crop or soil in a relative accurate manner over a relative long period of the lifespan of the solenoid valve. In addition, by comparing the detected actual voltage change with the reference data a change in condition of the solenoid valve may be observed. Taking into account this change in condition wear, pollution or malfunction of the solenoid valve may be determined.
In this regard it is beneficial if said reference data comprises at least one of:
- a time dependent voltage change across said coil after removing said operating voltage, wherein said solenoid valve is in a reference condition;
- a time dependent induced voltage across said coil, wherein said solenoid valve is in a reference condition.
It is beneficial if said controller is further arranged to detect presence of said solenoid valve and to collect said reference data when said solenoid valve is in use, preferably to collect said reference data during a first use, by said system, of said solenoid valve. This is beneficial for allowing said system to determine a start or initial condition taking into account operating values such as the voltage change across the coil after removing the operating voltage and the voltage induced across the coil by the plunger. This is beneficial for determining and controlling the amount of agricultural product that is delivered to the plant, crop or soil in a relative accurate manner over a relative long period of the lifespan of the solenoid valve. In addition, by comparing the detected actual voltage change with the reference data a change in condition of the solenoid valve may be observed. Taking into account this change in condition, wear, pollution or malfunction of the solenoid valve may be determined.
In an embodiment of the system according to the first aspect of the present disclosure said system comprises historical data related to said detected voltage change across said coil after removing said operating voltage and/or comprises historical data related to said induced voltage across said coil, wherein said controller is further arranged to determine a change of condition of said solenoid valve taking into account said stored historical data. This is beneficial for determining and controlling the amount of agricultural product that is delivered to the plant, crop or soil in a relative accurate manner over a relative long period of the lifespan of the solenoid valve. In addition, by comparing the detected actual voltage change with the historical reference data a change in condition of the solenoid valve over the lifespan of the solenoid valve may be observed. Taking into account this change in condition over the lifespan of the solenoid valve, wear, pollution or malfunction of the solenoid valve may be determined and a time to failure and/or time to maintenance of the solenoid valve may be determined.
In an embodiment of the system according to the first aspect of the present disclosure said controller is further arranged to determine a position of said plunger in said coil taking into account said detected voltage change across said coil of said solenoid valve and/or taking into account said detected induced voltage across said coil of said solenoid valve. This is beneficial for determining and controlling the amount of agricultural product that is delivered to the plant, crop or soil in a relative accurate manner.
In this regard it is beneficial if said position of said plunger is said first position or said second position. This is beneficial for determining and controlling the amount of agricultural product that is delivered to the plant, crop or soil in a relative accurate manner.
In an embodiment of the system according to the first aspect of the present disclosure said system further comprises a sensor for detecting a characteristic of said plant, crop or soil, wherein said controller is arranged to control opening and closing of said solenoid valve taking into account said detected characteristic for delivery of said amount of agricultural product to said plant, crop or soil. This is beneficial for determining the amount of agricultural product that is to be delivered to the plant, crop or soil in a relative accurate manner.
In this regard it is beneficial if said amount of agricultural product is based on said detected characteristic. This is beneficial for determining the amount of agricultural product that is to be delivered to the plant, crop or soil in a relative accurate manner.
In an embodiment of the system according to the first aspect of the present disclosure said solenoid valve is arranged to move said plunger from said second position to said first position when applying said operating voltage to said coil and to move said plunger from said first position to said second position when said operating voltage is removed from said coil, or wherein said solenoid valve is arranged to move said plunger from said first position to said second position when applying said operating voltage to said coil and to move said plunger from said second position to said first position when said operating voltage is removed from said coil.
In an embodiment of the system according to the first aspect of the present disclosure said system comprises an urging element for urging said plunger into said first position and/or in said second position. This is beneficial for urging the plunger into the first position and/or into the second position thereby contributing to the accuracy of the amount of agricultural product that is delivered to the plant, crop or soil.
According to a second aspect the present disclosure relates to an agricultural vehicle comprising a system according to the first aspect of the present disclosure. Advantages of the agricultural vehicle are analogue to the advantages of the system according to the first aspect of the present disclosure.
The present disclosure will now be explained by means of a description of preferred embodiments of a system according to the first aspect of the present disclosure, in which reference is made to the following schematic figures, in which:
Fig. 1 a system according to the first aspect of the present disclosure is shown;
Fig. 2 a time dependent voltage change across said coil after removing said operating voltage and a time dependent induced voltage across said coil are shown;
Fig. 3 an agricultural vehicle according to the second aspect of the present disclosure is shown.
An agricultural vehicle 100 is provided with system 1. System 1 comprises a container 13 for holding a fluid such as a herbicide or a fertilizer that is to be delivered to a plant, crop or soil. The container 13 is coupled for fluid flow via a tubing 15 with a solenoid valve 3. The solenoid valve 3 is coupled for fluid flow with a nozzle 17 for spraying fluid from the container 13 onto the plant, crop or soil. The system 1 further comprises a sensor 11 for detecting a characteristic of a plant, crop or soil onto which said fluid from said container 13 needs to be delivered.
The solenoid valve 3 comprises a coil 5 and a plunger 7. The plunger 7 is moveably arranged in a receiving space 19 of said coil 5. In a first position of the plunger 7 in the receiving space 19, the plunger 7 is moved away from an outlet 21 of the solenoid valve 3 and thereby allows fluid from the container 3 to flow via the solenoid valve 3 and the nozzle 17 onto the plant, crop or soil. In this first position the plunger 7 extends at a first end of the coil 5 out of the receiving space 19. Ina second position of the plunger 7 the plunger 7 rests with an end thereof on a seating 23 for closing said outlet 21 and thereby blocking said fluid from said container 13 to flow via said solenoid valve 3 and said nozzle 17 onto said plant, crop or soil. In the second position, the plunger 7 extends at a second end of the coil 5, wherein said second end of said coil 5 is opposite said first end of said coil 5, out of the receiving space 19.
A controller 9 is operatively coupled to said solenoid valve 3 to control opening and closing of said solenoid valve 3 taking into account said detected characteristic, by said sensor 11. Opening of the solenoid valve 3 is realized by applying, by said controller 9, an operating voltage OV to said coil 5. As a result of said applied operating voltage OV a magnetic field is induced in said receiving space 19, by said coil 5, causing the plunger 7 to move against the force of an urging element formed by a spring 25 from the second position into the first position. After removal of said operating voltage OV the plunger 7 is moved, by said urging element 25, from the first position into said second position for blocking said outlet 21.
The controller 9 is arranged to detect, after removal of the operating voltage OV from the coil 5 at time TO, a change of a voltage across the coil 5 and an induced voltage IV across said coil 5 due to movement of said plunger 7 relative to said coil 5. More specifically, the controller 9 is arranged to detect, after removal of the operating voltage OV at TO, a peak in the voltage across the coil 5 at T1 and an exponential change of the voltage after said peak in voltage toward a voltage level of substantially zero at T4. In addition, controller 9 is arranged to detect at time T2, after removing the operating voltage OV at TO and after the voltage peak at T1, a first induced voltage peak superimposed on said exponential change of said voltage level. This first induced voltage peak at time T2 corresponds to a start of a movement of the plunger 7 out of the first position. Moreover, controller 9 is arranged to detect a second induced voltage peak at T3 after time T2, wherein said second induced voltage peak corresponds to a stop of the movement of the plunger 7 relative to the coil 5.
During the time period from TO until T2 the plunger 7 remains in the open position even though the operating voltage has been removed from the coil 5 at TO. As a result, the fluid from the container 13 will continue to flow via the solenoid valve 3 and the nozzle 17 onto the plant, crop or soil for an additional time after removing the operating voltage OV across the coil 5 at a rate similar to the rate when the operating voltage was applied across the coil 5. In the time frame from time T2 to time T3 the flow of fluid from the container 13 via the solenoid nozzle 3 continues but decreases with time progressing from time T2 to time T3 due to the plunger 7 approaching the outlet 21 of the solenoid valve 3. The controller 9 is arranged to determine, based on said determined moments TO, T2 and T3 and a time period of applying said operating voltage OV across said coil 5, a relative accurate amount of fluid delivered to said plant, crop or soil via said solenoid valve 3.
A relative exact position of said plunger 7 in said receiving space 19 of said coil 5 is determined, by said controller 9, based on said determined moments TO, T2 and T3 and a travel distance of said plunger between said first position and said second position. The controller 9 is arranged to determine a time difference between said time T2 and T3 and compare said determined time difference with reference data 27 that is comprised by said system 1. In case the time difference between T2 and T3 is similar to the time difference as recorded in the reference data 27 an actual condition of the solenoid valve 3 may correspond to an initial or start condition of the solenoid valve 5 when said solenoid valve was initially installed in said system 1. A time difference between T2 and T3 that is smaller than the time difference as recorded in the reference data 27 may indicate the plunger 7 is not returning to the second position or the plunger 7 not achieving the first position after applying said operating voltage OV across said coil 5. A determined moment T2 larger than T2 of the available reference data 27 indicates pollution of the solenoid valve 3 causing the plunger 7 to remain stuck in the first position for an increased time after removing the operating voltage OV. Absence of induced voltage peaks may indicate that the plunger 7 is not moving relative to the coil 5.

Claims (15)

1. A system (1) for spraying an agricultural product, such as a herbicide or a fertilizer, on a plant, crop or soil, the system (1) comprising:
- a solenoid valve (3) arranged to control delivery of said agricultural product to said plant, crop or soil, wherein said solenoid valve (3) comprises a coil (5) and a plunger (7), wherein said plunger (7) is moveably arranged in said coil (5) between a first position wherein said solenoid valve (3) is open and a second position wherein said solenoid valve (3) is closed;
- a controller (9) arranged to control opening and closing of said solenoid valve (3) for delivery of an amount of agricultural product to said plant, crop or soil, wherein the controller (9) is further arranged to determine movement of said plunger (7) relative to said coil (5) of said solenoid valve (3).
2. A system (1) according to claim 1, wherein said solenoid valve (3) is arranged to move said plunger (7) relative to said coil (5) when applying an operating voltage to said coil (5), wherein said controller (9) is further arranged to detect a voltage change, preferably a voltage decay, across said coil (5) after removing said operating voltage for determining said movement of said plunger (7) relative to said coil (5) of said solenoid valve (3).
3. A system (1) according to claim 1 or 2, wherein said controller (9) is further arranged to detect an induced voltage across said coil (5) of said solenoid valve (3) as a result of said movement of said plunger (7) for determining said movement of said plunger (7) relative to said coil (5) of said solenoid valve (3).
4. A system (1) according to claim 2 and claim 3, wherein said controller (9) is further arranged to derive a time duration for moving said plunger (7) from said first position to said second position or for moving said plunger (7) from said second position to said first position after removing said operating voltage from said coil (5) taking into account said detected induced voltage across said coil (5).
5. A system (1) according to claim 2 and claim 3, wherein said controller (9) is further arranged to determine a time duration for said plunger (7) to start to move relative to said coil (5) after removing said operating voltage from said coil (5) taking into account said detected induced voltage across said coil (5) and/or wherein said controller (9) is further arranged to determine a time duration for said plunger (7) to stop moving relative to said coil (5) after removing said operating voltage from said coil (5) taking into account said detected induced voltage across said coil (5).
6. A system (1) according to claim 2 and claim 3, wherein said controller (9) is further arranged to determine a time duration between a start of movement of said plunger (7) relative to said coil (5) and an end of movement of said plunger (7) relative to said coil (5) after removing said operating voltage from said coil (5) taking into account said detected induced voltage across said coil (5).
7. A system (1) according to claim 2 and/or 3, wherein said system (1) comprises reference data related to said movement of said plunger (7) relative to said coil (5) of said solenoid valve (3), wherein said controller (9) is further arranged to compare said detected voltage change across said coil (5) after removing said operating voltage and/or said induced voltage across said coil (5) with said reference data to determine an actual condition of said solenoid valve (3).
8. A system (1) according to claim 7, wherein said reference data comprises at least one of:
- a time dependent voltage change across said coil (5) after removing said operating voltage, wherein said solenoid valve (3) is in a reference condition;
- a time dependent induced voltage across said coil (5), wherein said solenoid valve (3) is in a reference condition.
9. A system (1) according to claim 7, wherein said controller (9) is further arranged to detect presence of said solenoid valve (3) and to collect said reference data when said solenoid valve (3) is in use, preferably to collect said reference data during a first use, by said system (1), of said solenoid valve (3).
10. A system (1) according to claim 2 and/or 3 or a dependent claim thereof, wherein said system (1) comprises historical data related to said detected voltage change across said coil (5) after removing said operating voltage and/or comprises historical data related to said induced voltage across said coil (5), wherein said controller (9) is further arranged to determine a change of condition of said solenoid valve (3) taking into account said historical data.
11. A system (1) according to claim 2 and/or 3 or a dependent claim thereof, wherein said controller (9) is further arranged to determine a position of said plunger (7) in said coil (5) taking into account said detected voltage change across said coil of said solenoid valve (3) and/or taking into account said detected induced voltage across said coil (5) of said solenoid valve (3).
12. A system (1) according to claim 11, wherein said position of said plunger is said first position or said second position.
13. A system (1) according to any one of the preceding claims, said system (1) further comprising:
a sensor (11) for detecting a characteristic of said plant, crop or soil, wherein said controller (9) is arranged to control opening and closing of said solenoid valve (3) taking into account said detected characteristic for delivery of said amount of agricultural product to said plant, crop or soil.
14. A system (1) according to any one of the preceding claims, wherein said solenoid valve (3) is arranged to move said plunger (7) from said second position to said first position when applying said operating voltage to said coil (5) and to move said plunger (7) from said first position to said second position when said operating voltage is removed from said coil (5), or wherein said solenoid valve is arranged to move said plunger from said first position to said second position when applying said operating voltage to said coil and to move said plunger from said second position to said first position when said operating voltage is removed from said coil.
15. An agricultural vehicle (100) comprising a system (1) according to any one of the preceding claims.
NL2020917A 2018-05-14 2018-05-14 System for spraying an agricultural product NL2020917B1 (en)

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Application Number Priority Date Filing Date Title
NL2020917A NL2020917B1 (en) 2018-05-14 2018-05-14 System for spraying an agricultural product

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NL2020917A NL2020917B1 (en) 2018-05-14 2018-05-14 System for spraying an agricultural product

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6250564B1 (en) * 1999-02-15 2001-06-26 Flexi-Coil Ltd. Flow control system for sprayer nozzles
WO2008112930A1 (en) * 2007-03-13 2008-09-18 The Regents Of The University Of California Electronic actuator for simultaneous liquid flowrate and pressure control of sprayers
US20120228395A1 (en) * 2011-03-07 2012-09-13 Capstan Ag Systems, Inc. Electrically actuated valve for control of instantaneous pressure drop and cyclic durations of flow
EP3162448A1 (en) * 2015-10-29 2017-05-03 Capstan AG Systems, Inc. System and methods for estimating fluid flow based on valve closure time

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6250564B1 (en) * 1999-02-15 2001-06-26 Flexi-Coil Ltd. Flow control system for sprayer nozzles
WO2008112930A1 (en) * 2007-03-13 2008-09-18 The Regents Of The University Of California Electronic actuator for simultaneous liquid flowrate and pressure control of sprayers
US20120228395A1 (en) * 2011-03-07 2012-09-13 Capstan Ag Systems, Inc. Electrically actuated valve for control of instantaneous pressure drop and cyclic durations of flow
EP3162448A1 (en) * 2015-10-29 2017-05-03 Capstan AG Systems, Inc. System and methods for estimating fluid flow based on valve closure time

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