DK1269823T3 - System til indstilling af höst-forsatsdel på en höstmaskine - Google Patents

System til indstilling af höst-forsatsdel på en höstmaskine

Info

Publication number
DK1269823T3
DK1269823T3 DK02013853T DK02013853T DK1269823T3 DK 1269823 T3 DK1269823 T3 DK 1269823T3 DK 02013853 T DK02013853 T DK 02013853T DK 02013853 T DK02013853 T DK 02013853T DK 1269823 T3 DK1269823 T3 DK 1269823T3
Authority
DK
Denmark
Prior art keywords
autumn
setting
machine
attachment part
attachment
Prior art date
Application number
DK02013853T
Other languages
English (en)
Inventor
Bruce Alan Coers
Folker Dr Beck
Original Assignee
Deere & Co
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 Deere & Co filed Critical Deere & Co
Application granted granted Critical
Publication of DK1269823T3 publication Critical patent/DK1269823T3/da

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D41/00—Combines, i.e. harvesters or mowers combined with threshing devices
    • A01D41/12—Details of combines
    • A01D41/14—Mowing tables
    • A01D41/141—Automatic header control

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Lifting Devices For Agricultural Implements (AREA)
  • Combines (AREA)
  • Guiding Agricultural Machines (AREA)
  • Harvester Elements (AREA)
DK02013853T 2001-06-28 2002-06-22 System til indstilling af höst-forsatsdel på en höstmaskine DK1269823T3 (da)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US09/894,040 US6615570B2 (en) 2001-06-28 2001-06-28 Header position control with forward contour prediction

Publications (1)

Publication Number Publication Date
DK1269823T3 true DK1269823T3 (da) 2006-01-30

Family

ID=25402510

Family Applications (1)

Application Number Title Priority Date Filing Date
DK02013853T DK1269823T3 (da) 2001-06-28 2002-06-22 System til indstilling af höst-forsatsdel på en höstmaskine

Country Status (8)

Country Link
US (1) US6615570B2 (da)
EP (1) EP1269823B1 (da)
AR (1) AR034661A1 (da)
AU (1) AU780865B2 (da)
BR (1) BR0202429B1 (da)
CA (1) CA2377846C (da)
DE (1) DE50205002D1 (da)
DK (1) DK1269823T3 (da)

Families Citing this family (101)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10204702A1 (de) * 2002-02-05 2003-08-14 Claas Selbstfahr Erntemasch Ortungssystem an selbstfahrenden landwirtschaftlichen Arbeitsmaschinen
DE10214648A1 (de) * 2002-04-02 2003-10-16 Claas Selbstfahr Erntemasch Messeinrichtung an einer landwirtschaftlichen Maschine
DE10227484A1 (de) * 2002-06-19 2004-02-26 Claas Selbstfahrende Erntemaschinen Gmbh Vorrichtung und Verfahren zur Lagesteuerung eines Erntegutaufnahmegerätes landwirtschaftlicher Erntemaschinen
US20050081498A1 (en) * 2003-03-19 2005-04-21 John Harvey Method of harvesting sugarcane
DE10342922A1 (de) * 2003-09-15 2005-05-19 Claas Selbstfahrende Erntemaschinen Gmbh Häcksel- und Verteilvorrichtung
US7916898B2 (en) * 2003-09-15 2011-03-29 Deere & Company Method and system for identifying an edge of a crop
US7107747B2 (en) * 2004-03-29 2006-09-19 Cnh America Llc End of row detection and compacting sequence for a cotton harvesting machine
US7869922B2 (en) 2004-04-12 2011-01-11 Cnh America Llc Method and apparatus to put a windrower header in the transport mode under specified conditions
US7555883B2 (en) 2004-04-12 2009-07-07 Cnh America Llc System and method for managing the electrical control system of a windrower header flotation and lift system
US7703266B2 (en) 2004-04-12 2010-04-27 Cnh America Llc Method for managing the electrical control system of a windrower header flotation and lift system
GB0408931D0 (en) * 2004-04-22 2004-05-26 Cnh Belgium Nv Method for operating a grain cleaning system in a combine harvester
US7412905B1 (en) 2004-05-31 2008-08-19 Richard Anthony Bishel Paddle sensor
DE102005015615B4 (de) * 2005-04-05 2010-12-09 Mulag Fahrzeugwerk Heinz Wössner GmbH u. Co KG Verfahren und Vorrichtung zur Steuerung eines Arbeitskopfes
DE102005059351A1 (de) * 2005-12-09 2007-06-21 Claas Selbstfahrende Erntemaschinen Gmbh Hydrauliksystem für eine selbstfahrende Erntemaschine
DE102006002053A1 (de) 2006-01-16 2007-08-30 Deere & Company, Moline Selbstfahrende landwirtschaftliche Erntemaschine mit einem um eine vertikale Achse schwenkbaren Erntevorsatz
US7404355B2 (en) * 2006-01-31 2008-07-29 Deere & Company Tractor and baler combination with automatic baling and tractor halt control
US20070193243A1 (en) 2006-02-10 2007-08-23 Schmidt James R Combine Harvester Draper Header Having Flexible Cutterbar
US20080276590A1 (en) 2006-02-10 2008-11-13 Agco Corporation Flexible draper and cutter bar with tilt arm for cutterbar drive
US20080271426A1 (en) 2006-02-10 2008-11-06 Agco Corporation Draper belt with crop-retaining rib
US7540130B2 (en) * 2006-03-02 2009-06-02 Deere & Company Height control for a multi-section cutting platform in an agricultural harvesting machine
NL1032662C2 (nl) * 2006-10-11 2008-04-14 Maasland Nv Systeem voor het afbakenen van een gebied.
NL1032663C2 (nl) * 2006-10-11 2008-04-14 Maasland Nv Systeem voor het afbakenen van een gebied.
US7647753B2 (en) * 2006-12-30 2010-01-19 Headsight, Inc. Header height control system and method
US7401455B1 (en) * 2007-01-03 2008-07-22 Cnh America Llc System and method for controlling the base cutter height of a sugar cane harvester
US9615501B2 (en) * 2007-01-18 2017-04-11 Deere & Company Controlling the position of an agricultural implement coupled to an agricultural vehicle based upon three-dimensional topography data
US20090266044A1 (en) 2008-04-25 2009-10-29 Coers Bruce A Integrated draper belt support and skid shoe in an agricultural harvesting machine
US7921627B2 (en) 2008-05-09 2011-04-12 Agco Corporation Interlocking belt guards for a draper header
WO2009136272A1 (en) 2008-05-09 2009-11-12 Agco Corporation Adjustable cutterbar travel range for a flexible cutterbar header
US20090277148A1 (en) 2008-05-09 2009-11-12 Agco Corporation Flexible draper and cutter bar having shiftable crop divider with deflector
US7886511B2 (en) 2008-05-09 2011-02-15 Agco Corporation Draper head with flexible cutterbar having rigid center section
US20090277145A1 (en) 2008-05-09 2009-11-12 Agco Corporation Header height control system with multiple potentiometer input
WO2009136267A1 (en) 2008-05-09 2009-11-12 Agco Corporation Center crop deflector for draper header
US20090277144A1 (en) 2008-05-09 2009-11-12 Agco Corporation Spring flotation for center deck of draper header
US8989972B2 (en) 2008-09-11 2015-03-24 Deere & Company Leader-follower fully-autonomous vehicle with operator on side
US8478493B2 (en) * 2008-09-11 2013-07-02 Deere & Company High integrity perception program
US8818567B2 (en) * 2008-09-11 2014-08-26 Deere & Company High integrity perception for machine localization and safeguarding
US8392065B2 (en) * 2008-09-11 2013-03-05 Deere & Company Leader-follower semi-autonomous vehicle with operator on side
US9026315B2 (en) 2010-10-13 2015-05-05 Deere & Company Apparatus for machine coordination which maintains line-of-site contact
US9188980B2 (en) * 2008-09-11 2015-11-17 Deere & Company Vehicle with high integrity perception system
US8224500B2 (en) * 2008-09-11 2012-07-17 Deere & Company Distributed knowledge base program for vehicular localization and work-site management
US8195358B2 (en) 2008-09-11 2012-06-05 Deere & Company Multi-vehicle high integrity perception
US8229618B2 (en) * 2008-09-11 2012-07-24 Deere & Company Leader-follower fully autonomous vehicle with operator on side
US8195342B2 (en) * 2008-09-11 2012-06-05 Deere & Company Distributed knowledge base for vehicular localization and work-site management
US20100063652A1 (en) * 2008-09-11 2010-03-11 Noel Wayne Anderson Garment for Use Near Autonomous Machines
US9235214B2 (en) * 2008-09-11 2016-01-12 Deere & Company Distributed knowledge base method for vehicular localization and work-site management
US7870709B2 (en) * 2009-02-25 2011-01-18 Chn America Llc Automatic lateral tilt control of a header in stubble height mode using machine level sensor
US20100287898A1 (en) * 2009-05-18 2010-11-18 Cnh America, Llc Ground speed implement height control adjustment rate on agricultural vehicles
US8635842B2 (en) * 2009-08-05 2014-01-28 Kevin Markt Flexible row crop header for an agricultural harvester
US8396597B2 (en) * 2009-08-18 2013-03-12 Deere & Company Distributed robotic guidance
US20110046784A1 (en) * 2009-08-18 2011-02-24 Noel Wayne Anderson Asymmetric stereo vision system
US20110153338A1 (en) * 2009-12-17 2011-06-23 Noel Wayne Anderson System and method for deploying portable landmarks
US8635015B2 (en) 2009-12-17 2014-01-21 Deere & Company Enhanced visual landmark for localization
US8224516B2 (en) * 2009-12-17 2012-07-17 Deere & Company System and method for area coverage using sector decomposition
US20110160968A1 (en) * 2009-12-29 2011-06-30 Agco Corporation Work implement control based on worked area
US8255126B2 (en) * 2010-02-26 2012-08-28 Deere & Company Aerator having flexible frame
US7992374B1 (en) 2010-04-06 2011-08-09 Cnh America Llc Agricultural plant cutting header with fore and aft adjustable flexible cutterbar having automatic preload adjustment
US8205421B2 (en) 2010-06-16 2012-06-26 Agco Corporation Belt guard crop dam for flexible draper header
US7958711B1 (en) 2010-06-16 2011-06-14 Agco Corporation Crop deflector for ends of draper belt of flexible draper header
US8726622B2 (en) * 2010-12-16 2014-05-20 Cnh Industrial America Llc Feeder arm safety stand
US8333057B2 (en) 2011-01-06 2012-12-18 Cnh America Llc Automatic header lateral tilt to ground speed response
DE102011083535A1 (de) 2011-09-27 2013-03-28 Deere & Company Selbstfahrende landwirtschaftliche Erntemaschine mit einem um eine vertikale Achse schwenkbaren Erntevorsatz
US8479483B1 (en) 2011-12-27 2013-07-09 Agco Corporation Flexible draper head providing reduced crop residue accumulation
DE102012012907A1 (de) * 2012-06-28 2014-04-17 Claas Selbstfahrende Erntemaschinen Gmbh Selbstfahrende Erntemaschine mithöhengeregeltem Schneidwerk
US9148998B2 (en) * 2012-08-11 2015-10-06 Deere & Company Header height control system
US9320197B2 (en) 2012-08-17 2016-04-26 Deere & Company Self-propelled agricultural harvesting machine having a crop attachment which is pivotable about a vertical axis
US20150195991A1 (en) 2014-01-15 2015-07-16 Cnh America Llc Header height control system for an agricultural harvester
US10216156B2 (en) 2014-03-25 2019-02-26 Macdon Industries Ltd. Controlling cutting height and angle of a combine header
DE102014208070A1 (de) 2014-04-29 2015-12-17 Deere & Company Die Fahrzeugdynamik berücksichtigendes Kontrollsystem zur Positionssteuerung eines Geräts für ein landwirtschaftliches Arbeitsfahrzeug
US9807933B2 (en) 2014-10-20 2017-11-07 Cnh Industrial America Llc Sensor equipped agricultural harvester
US9693502B2 (en) * 2014-10-24 2017-07-04 Agco Corporation Active header control
FR3029389B1 (fr) 2014-12-05 2017-01-13 Commissariat Energie Atomique Systeme et procede d'ajustement automatique de la hauteur d'un outil agricole au moyen d'une reconstruction 3d
US9844184B2 (en) * 2015-03-17 2017-12-19 Agco Corporation Header position sensing system for an agricultural harvester
US9585309B2 (en) * 2015-07-14 2017-03-07 Cnh Industrial America Llc Header height control system for an agricultural harvester
US9769982B2 (en) * 2015-09-09 2017-09-26 Cnh Industrial America Llc Method and apparatus for automatically controlling a cut height of an agricultural harvester
DE102015118767A1 (de) 2015-11-03 2017-05-04 Claas Selbstfahrende Erntemaschinen Gmbh Umfelddetektionseinrichtung für landwirtschaftliche Arbeitsmaschine
US10588258B2 (en) 2016-02-25 2020-03-17 Deere & Company Automatic determination of the control unit parameters of an arrangement to control an actuator for the adjustment of an adjustable element of an agricultural machine
DE102017202491A1 (de) 2016-02-25 2017-08-31 Deere & Company Selbsttätige Ermittlung von Regelparametern einer Anordnung zur Ansteuerung eines Aktors zur Verstellung eines verstellbaren Elements einer landwirtschaftlichen Arbeitsmaschine
IT201600082338A1 (it) * 2016-08-04 2018-02-04 Dinamica Generale S P A Sistema di analisi per macchine agricole di raccolta
DE102017208442A1 (de) * 2017-05-18 2018-11-22 Deere & Company Selbstlernende, Korrektureingaben berücksichtigende Anordnung zur selbsttätigen Kontrolle eines Arbeitsparameters einer Erntegutförder- und/oder -bearbeitungseinrichtung
DE102017004808B3 (de) 2017-05-19 2018-09-06 Baumer Electric Ag Steuervorrichtung und Verfahren zur Steuerung einer Höhe eines Auslegers eines Fahrzeugs
EP3646705B1 (en) * 2017-06-26 2023-10-18 Kubota Corporation Harvesting machine
GB201721595D0 (en) * 2017-12-21 2018-02-07 Kms Projects Ltd Harvesting of crops
US10687466B2 (en) 2018-01-29 2020-06-23 Cnh Industrial America Llc Predictive header height control system
RU2747303C2 (ru) * 2018-04-09 2021-05-04 Дир Энд Компани Система для управления рабочим параметром уборочной жатки
US20190351765A1 (en) * 2018-05-18 2019-11-21 Cnh Industrial America Llc System and method for regulating the operating distance between work vehicles
DE102018117903A1 (de) 2018-07-24 2020-01-30 Claas Selbstfahrende Erntemaschinen Gmbh Selbstfahrende Erntemaschine
US11140824B2 (en) 2018-10-30 2021-10-12 Deere & Company Agricultural harvester biomass estimating system
US11375663B2 (en) 2019-02-15 2022-07-05 Deere & Company Ground contour sensing system for crop mowing head
US11375654B2 (en) * 2019-10-08 2022-07-05 Deere & Company Method and apparatus for adjusting a harvesting header float system based on machine pitch or terrain and system thereof
US11659785B2 (en) * 2019-10-23 2023-05-30 Cnh Industrial America Llc Method and system for controlling the height of an agricultural implement relative to the ground
US11793111B2 (en) 2019-11-27 2023-10-24 Cnh Industrial America Llc Harvesting head reel-mounted laser measurement
US11533847B2 (en) * 2019-12-23 2022-12-27 Cnh Industrial America Llc Control of a header of a harvester during a non-harvesting mode
US20210185918A1 (en) * 2019-12-23 2021-06-24 Cnh Industrial America Llc Systems and methods for controlling a position of a reel of an agricultural header
US12016257B2 (en) 2020-02-19 2024-06-25 Sabanto, Inc. Methods for detecting and clearing debris from planter gauge wheels, closing wheels and seed tubes
US11812695B2 (en) 2020-05-29 2023-11-14 Cnh Industrial America Llc Header height control for combine harvester
DE102021120012A1 (de) 2020-08-25 2022-03-03 Deere & Company Anordnung zur Steuerung der Höhe eines Erntevorsatzes zur Ernte stängelartigen Ernteguts
US11963480B2 (en) 2021-02-03 2024-04-23 Cnh Industrial America Llc Header fore/aft tilt control for combine harvester
US11856891B2 (en) 2021-03-26 2024-01-02 Cnh Industrial America Llc Systems and methods for controlling an agricultural header
DE102021131266A1 (de) 2021-11-29 2023-06-01 Deere & Company Kontrollanordnung zur Ansteuerung eines Hydraulikzylinders zur Verstellung eines Erntevorsatzes
CN113966667B (zh) * 2021-12-24 2022-03-15 潍柴雷沃重工股份有限公司 一种基于地面仿形的收获机割台自适应控制系统及收获机
CN114616975B (zh) * 2022-05-12 2022-10-04 农业农村部南京农业机械化研究所 联合收获机割台自动仿形系统及其控制方法

Family Cites Families (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2108067A (en) * 1968-05-01 1969-11-06 Automatic lift for harvesting machines
DE1955243A1 (de) * 1968-11-07 1970-05-27 Bolinder Munktell Vorrichtung zur Stoppelhoeheneinstellung an Maehdreschern
US4171606A (en) 1978-06-30 1979-10-23 Deere & Company Attitude control for a harvester pickup
US4507910A (en) 1983-11-21 1985-04-02 Ezra C. Lundahl, Inc. Automatic sonar activated height control for a header
US4594840A (en) * 1983-12-12 1986-06-17 Sperry Corporation Pneumatic system for combine header height control
US4776153A (en) 1986-02-27 1988-10-11 Deere & Company Automatic height control for a laterally pivoted harvester header
JPS6434202A (en) * 1987-07-30 1989-02-03 Kubota Ltd Working wagon of automatic conduct type
US4896486A (en) 1988-06-07 1990-01-30 Lundahl Research, Inc. Crop harvester having height control
US5155984A (en) 1991-04-24 1992-10-20 Ford New Holland, Inc. Implement height control
DE4220913C2 (de) * 1992-06-25 1995-01-05 Binder Juergen Dipl Ing Fh Vorrichtung und Verfahren zur berührungslosen Erfassung der relativen seitlichen Lage einer Pflanzenreihe zu einer landwirtschaftlichen Arbeitsmaschine in Reihenkulturen
JP2922726B2 (ja) * 1992-07-01 1999-07-26 株式会社フジタ 掘削機のバケット誘導システム
US5410479A (en) * 1992-08-17 1995-04-25 Coker; William B. Ultrasonic furrow or crop row following sensor
US5359836A (en) 1993-02-01 1994-11-01 Control Concepts, Inc. Agricultural harvester with closed loop header control
US5442552A (en) * 1993-03-16 1995-08-15 The Regents Of The University Of California Robotic cultivator
DE4406892A1 (de) * 1994-03-03 1995-09-07 Bosch Gmbh Robert Vorrichtung zur Regelung des Bodenabstandes einer Bearbeitungseinheit einer landwirtschaftlichen Maschine
DE19508941A1 (de) * 1995-03-13 1996-09-19 Claas Ohg Ortungsvorrichtung
DE19508942A1 (de) * 1995-03-13 1996-09-19 Claas Ohg Reflex-Ortungsvorrichtung
US5704200A (en) 1995-11-06 1998-01-06 Control Concepts, Inc. Agricultural harvester ground tracking control system and method using fuzzy logic
DE19602893A1 (de) * 1996-01-27 1997-07-31 Bosch Gmbh Robert Vorrichtung zur Regelung der Lage einer Bearbeitungseinheit einer landwirtschaftlichen Maschine
DK9896A (da) 1996-01-30 1997-07-31 Dronningborg Ind As Fremgangsmåde til måling af skærebordshøjde
DE19613386A1 (de) * 1996-04-03 1997-10-09 Fiat Om Carrelli Elevatori Flurförderzeug, das wahlweise manuell oder automatisch betreibbar ausgebildet ist
EP0801885B1 (en) * 1996-04-19 2002-01-09 Carnegie-Mellon University Vision-based crop line tracking for harvesters
US5951613A (en) * 1996-10-23 1999-09-14 Caterpillar Inc. Apparatus and method for determining the position of a work implement
DE19647523A1 (de) * 1996-11-16 1998-05-20 Claas Ohg Landwirtschaftliches Nutzfahrzeug mit einem in seiner Lage und/oder Ausrichtung gegenüber dem Fahrzeug verstellbar angeordneten Bearbeitungsgerät
DE19719939A1 (de) * 1997-05-13 1998-11-19 Claas Ohg Automatisch lenkbare Erntemaschine
DE19726917A1 (de) 1997-06-25 1999-01-07 Claas Selbstfahr Erntemasch Vorrichtung an Landmaschinen zur berührungslosen Abtastung von sich über den Boden erstreckenden Konturen
DE19743884C2 (de) * 1997-10-04 2003-10-09 Claas Selbstfahr Erntemasch Vorrichtung und Verfahren zur berührungslosen Erkennung von Bearbeitungsgrenzen oder entsprechenden Leitgrößen
US5941920A (en) * 1997-11-12 1999-08-24 Case Corporation Control of an active suspension system for a work vehicle based upon a parameter of another vehicle system
CA2257049A1 (en) * 1997-12-31 1999-06-30 Richard Gramm Combine header height control
JP4033966B2 (ja) * 1998-03-06 2008-01-16 株式会社トプコン 建設機械制御システム
DE19845666B4 (de) * 1998-10-05 2005-08-25 Claas Selbstfahrende Erntemaschinen Gmbh Lenkautomatik mit Ultraschall-Ortungsvorrichtung
NL1015800C2 (nl) * 2000-07-25 2002-01-28 Lely Entpr Ag Inrichting voor het bewerken van een bodemoppervlak.

Also Published As

Publication number Publication date
EP1269823B1 (de) 2005-11-23
US6615570B2 (en) 2003-09-09
CA2377846C (en) 2005-11-15
AR034661A1 (es) 2004-03-03
BR0202429B1 (pt) 2009-05-05
BR0202429A (pt) 2003-04-29
CA2377846A1 (en) 2002-12-28
DE50205002D1 (de) 2005-12-29
EP1269823A1 (de) 2003-01-02
AU4438502A (en) 2003-01-02
AU780865B2 (en) 2005-04-21
US20030000193A1 (en) 2003-01-02

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