Apparatus, systems and methods for row unit downforce control

Patent metadata

Field	Value
Publication number	US-9955623-B2
Application number	US-201615047221-A
Country	US
Kind code	B2
Filing date	Feb 18, 2016
Priority date	Aug 5, 2011
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

Systems, methods and apparatus for controlling the downforce applied to a row unit of an agricultural implement having multiple row units. A downpressure control device in fluid communication with a down chamber of the least one actuator maintains as a selected downpressure, any one of a continuous range of pressures in the downpressure chamber. A lift pressure control device in fluid communication with a lift chamber of the at least one actuator for controlling pressure in the lift chamber maintains as a selected lift pressure, any one of a continuous range of pressures in the lift chamber.

First claim

The invention claimed is:

1. An agricultural implement having multiple row units, each row unit comprising opening discs for opening a trench in soil and gauge wheels for setting a depth of the trench, and having a system for applying downforce to the row units, the system comprising:
a first actuator, said first actuator disposed to apply force to a first row unit, said first actuator including a first down chamber and a first lift chamber, pressure in said first down chamber tending to oppose pressure in said first lift chamber;
a second actuator, said second actuator disposed to apply force to a second row unit, said second actuator including a second down chamber and a second lift chamber, pressure in said second down chamber tending to oppose pressure in said second lift chamber;
a first downpressure control device in fluid communication with said first down chamber for controlling pressure in said first down chamber, said first downpressure control device configured to maintain as a selected first downpressure any one of a continuous range of pressures in said first downpressure chamber;
a second downpressure control device in fluid communication with said second down chamber for controlling pressure in said second down chamber, said second downpressure control device configured to maintain as a selected second downpressure any one of a continuous range of pressures in said second downpressure chamber, wherein said selected second downpressure is different from said selected first downpressure;
a lift pressure control device in fluid communication with both said first lift chamber and said second lift chamber for controlling pressure in said first lift chamber and said second lift chamber, said lift pressure control device configured to maintain as a selected lift pressure any one of a continuous range of pressures in both said first lift chamber and said second lift chamber.

2. The agricultural implement of claim 1 , further comprising:
processing circuitry in electrical communication with said first downpressure control device, said second downpressure control device, and said lift pressure control device, said processing circuitry configured to modify an operating state of said first downpressure control device, said second downpressure control device, and said lift pressure control device, wherein said processing circuitry is further configured to:
determine a first soil penetration criterion associated with said first row unit;
determine a second soil penetration criterion associated with said second row unit;
determine whether either said first soil penetration criterion or said second soil penetration criterion exceeds a predetermined range; and
reduce pressure in said first lift chamber and said second lift chamber when either said first soil penetration criterion or said second soil penetration criterion exceeds said predetermined range.

3. The agricultural implement of claim 2 , further including:
a first downforce sensor associated with said first row unit, said first downforce sensor in electrical communication with said processing circuitry, said first downforce sensor configured to generate a first downforce signal related to a force between the ground and said first row unit; and
a second downforce sensor associated with said second row unit, said second downforce sensor in electrical communication with said processing circuitry, said second downforce sensor configured to generate a second downforce signal related to a force between the ground and said second row unit.

4. The agricultural implement of claim 3 , wherein said processing circuitry is further configured to:
select and command a pressure in said first down chamber based on said first downforce signal; and
select and command a pressure in said second down chamber based on said second downforce signal.

5. The agricultural implement of claim 2 , further including:
a first downforce sensor associated with said first row unit, said first downforce sensor in electrical communication with said processing circuitry, said first downforce sensor configured to generate a first downforce signal related to a force between the ground and said first row unit; and
a second downforce sensor associated with said second row unit, said second downforce sensor in electrical communication with said processing circuitry, said second downforce sensor configured to generate a second downforce signal related to a force between the ground and said second row unit,
wherein said processing circuitry is further configured to determine a pressure in said first down chamber based on said first downforce signal and to determine a pressure in said second down chamber based on said second downforce signal.

6. The agricultural implement of claim 5 , wherein:
said first soil penetration criterion selected from one of: the pressure in said first down chamber, the pressure in said first down chamber less the pressure in said first lift chamber, and said first downforce signal; and
said second soil penetration criterion selected from one of: the pressure in said second down chamber, the pressure in said second down chamber less the pressure in said second lift chamber, and said second downforce signal.

7. The agricultural implement of claim 5 , wherein said processing circuitry is further configured to:
determine whether either said first soil penetration criterion or said second soil penetration criterion is less than a predetermined range; and
increase pressure in said first lift chamber and said second lift chamber when either said first soil penetration criterion or said second soil penetration criterion is less than said predetermined range and when neither said first soil penetration criterion nor said second soil penetration criterion exceeds said predetermined range.

8. The agricultural implement of claim 7 , wherein said first downforce sensor comprises a load-sensing pin.

9. The agricultural implement of claim 7 , wherein said processing circuitry is further configured to retain the pressure in said first down chamber and said second down chamber when both said first soil penetration criterion and said second soil penetration criterion are within said predetermined range.

10. The agricultural implement of claim 2 , wherein said processing circuitry is further configured to:
determine whether either said first soil penetration criterion or said second soil penetration criterion is less than a predetermined range; and
increase pressure in said first lift chamber and said second lift chamber when either said first soil penetration criterion or said second soil penetration criterion is less than said predetermined range and when neither said first soil penetration criterion nor said second soil penetration criterion exceeds said predetermined range.

11. A method of controlling the force applied to a first agricultural row unit by a first actuator having a first chamber and a second chamber and of controlling the force applied to a second agricultural row unit by a second actuator having a third chamber and a fourth chamber, the first and second agricultural row units including opening discs for opening a trench in soil and gauge wheels for setting a depth of the trench, the method comprising:
maintaining a first selected pressure in the first chamber by modifying an operating state of a first control device in fluid communication with the first chamber;
maintaining a second selected pressure in the third chamber by modifying an operating state of a second control device in fluid communication with the third chamber;
determining a first soil penetration criterion associated with the first row unit;
determining a second so

Assignees

• Prec Planting Llc

Inventors

• Sauder Derek A
• Radtke Ian R
• Stoller Jason J

Classifications

• A01C7/18

  Machines for depositing quantities of seed at intervals · CPC title

• A01B63/114 Primary

  to achieve a constant working depth · CPC title

• A01B63/111

  regulating working depth of implements · CPC title

• A01C7/205 Primary

  comprising pressure regulation means · CPC title

• A01C5/06

  Machines for making or covering drills or furrows for sowing or planting · CPC title