JPH0984411A - Ground work machine lifting control - Google Patents
Ground work machine lifting controlInfo
- Publication number
- JPH0984411A JPH0984411A JP24570395A JP24570395A JPH0984411A JP H0984411 A JPH0984411 A JP H0984411A JP 24570395 A JP24570395 A JP 24570395A JP 24570395 A JP24570395 A JP 24570395A JP H0984411 A JPH0984411 A JP H0984411A
- Authority
- JP
- Japan
- Prior art keywords
- height
- ground work
- setter
- work implement
- ground
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
Links
Landscapes
- Lifting Devices For Agricultural Implements (AREA)
Abstract
(57)【要約】 （修正有）
【課題】耕耘作業中の土壌の硬軟変化による作業負荷の
変動に容易に対応し、且つ、畦直近からの耕耘作業を可
能として未耕地部を少なくする。
【解決手段】モ−ド切替手段を高さ制御側に切り替えて
いるときは、高さ設定器による設定高さに対地作業機を
昇降制御し、モ−ド切替手段を耕深制御側に切り替えて
いるときは、高さ設定器により指定される対地作業機の
設定高さが耕深設定器により指定される対地作業機の設
定高さより低ければ耕深設定器により指定される対地作
業機の設定高さに対地作業機を昇降制御し、高さ設定器
により指定される対地作業機の設定高さが耕深設定器に
より指定される対地作業機の設定高さより高ければ、高
さ設定器により指定される対地作業機の設定高さに対地
作業機を昇降制御する。
(57) [Abstract] (Correction) [Problem] To easily respond to changes in work load due to changes in soil hardness during cultivating work, and to enable cultivating work immediately from the ridges to reduce uncultivated land. SOLUTION: When the mode switching means is switched to the height control side, the ground work implement is vertically controlled to the height set by the height setter, and the mode switching means is switched to the working depth control side. If the set height of the ground work implement specified by the height setter is lower than the set height of the ground work implement specified by the plowing depth setter, the ground work implement specified by the plowing depth setter If the height of the ground work implement is controlled to the set height and the height of the ground work implement specified by the height setter is higher than the set height of the ground work implement specified by the working depth setter, the height setter The ground work implement is vertically controlled to the set height of the ground work implement designated by.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、農業用のトラクタ
等に連結されるロータリ耕耘装置等の対地作業機の昇降
制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting control device for a ground work machine such as a rotary tiller connected to an agricultural tractor.
【０００２】[0002]
【従来の技術】従来、油圧昇降機構により昇降可能に対
地作業機を設け、高さ設定器による設定高さに高さセン
サによる検出高さが一致するよう油圧昇降機構を制御す
る高さ制御手段と、耕深設定器による設定耕深に耕深セ
ンサによる検出耕深が一致するよう油圧昇降機構を制御
する耕深制御手段とを備えた対地作業機の昇降制御装置
がある。2. Description of the Related Art Conventionally, a height control means for controlling a hydraulic lifting mechanism such that a ground work machine is provided so as to be able to move up and down by a hydraulic lifting mechanism and the height detected by a height sensor matches the height set by a height setter. Also, there is a lifting control device for a ground work machine including a working depth control means for controlling the hydraulic lifting mechanism so that the working depth set by the working depth setting device matches the working depth detected by the working depth sensor.
【０００３】[0003]
【発明が解決しようとする課題】上記の従来装置におい
て、耕深設定器により耕深を設定して、該設定耕深に耕
深センサによる検出耕深が一致するよう油圧昇降機構を
制御する耕深制御状態で作業しているときに、作業対象
となる土壌の硬さが局所的に硬くなると、作業負荷が急
増し、エンジン回転が急激に低下したり、エンストを起
こす場合がある。In the above conventional apparatus, the tilling depth is set by the tilling depth setting device, and the hydraulic lifting mechanism is controlled so that the tilling depth detected by the tilling depth sensor matches the set tilling depth. When working in the deep control state, if the hardness of the soil to be worked becomes locally hard, the work load may rapidly increase, the engine rotation may suddenly decrease, or the engine may stall.
【０００４】このような場合には、一時的に設定耕深を
浅くして作業負荷を軽減することで対応できるが、この
ように対応すると、土壌の硬い個所を通り過ぎてもとの
設定耕深に戻すときに、そのもとの設定耕深と異なる耕
深に設定しまうことがあり、耕深が変わってしまう問題
がある。In such a case, it can be dealt with by temporarily reducing the set working depth to reduce the work load. However, if such a measure is taken, the original set working depth is passed even if the soil passes a hard part. When returning to, the working depth may be set different from the original working depth, and there is a problem that the working depth changes.
【０００５】[0005]
【課題を解決するための手段】この発明は、上記課題を
解決するために、油圧昇降機構により昇降可能に対地作
業機を設け、高さ設定器による設定高さに高さセンサに
よる検出高さが一致するよう油圧昇降機構を制御する高
さ制御手段と、耕深設定器による設定耕深に耕深センサ
による検出耕深が一致するよう油圧昇降機構を制御する
耕深制御手段とを備えた対地作業機の昇降制御装置にお
いて、制御モ−ドを切替えるモ−ド切替手段を備え、該
モ−ド切替手段を高さ制御側に切り替えているときは、
高さ設定器による設定高さに対地作業機を昇降制御する
構成とし、モ−ド切替手段を耕深制御側に切り替えてい
るときは、高さ設定器により指定される対地作業機の設
定高さが耕深設定器により指定される対地作業機の設定
高さより低ければ耕深設定器により指定される対地作業
機の設定高さに対地作業機を昇降制御し、高さ設定器に
より指定される対地作業機の設定高さが耕深設定器によ
り指定される対地作業機の設定高さより高ければ高さ設
定器により指定される対地作業機の設定高さに対地作業
機を昇降制御する構成としたことを特徴とする対地作業
機の昇降制御装置とした。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a ground work machine which can be moved up and down by a hydraulic lifting mechanism, and a height detected by a height sensor to a height set by a height setter. The height control means for controlling the hydraulic lifting mechanism so that the working depth and the working depth control means for controlling the hydraulic lifting mechanism so that the working depth detected by the working depth sensor matches the set working depth set by the working depth setting device are provided. In the elevator control device for a ground work machine, a mode switching means for switching the control mode is provided, and when the mode switching means is switched to the height control side,
When the height of the ground work implement is controlled to rise and fall to the set height by the height setter and the mode switching means is switched to the working depth control side, the set height of the ground work implement specified by the height setter is set. If the height is lower than the set height of the ground work implement specified by the plow depth setter, the ground work implement is controlled to rise and fall to the set height of the ground work implement specified by the tillage depth setter, and the height setter specifies it. If the set height of the ground work implement is higher than the set height of the ground work implement specified by the plowing depth setter, the ground work implement is vertically moved to the set height of the ground work implement specified by the height setter. A lifting control device for a ground work machine characterized by the above.
【０００６】[0006]
【発明の作用及び効果】この発明の対地作業機の昇降制
御装置は、モ−ド切替手段を高さ制御側に切り替えてい
るときは、高さ設定器による設定高さに対地作業機を昇
降制御し、モ−ド切替手段を耕深制御側に切り替えてい
るときは、高さ設定器により指定される対地作業機の設
定高さが、耕深設定器により指定される対地作業機の設
定高さより低ければ、耕深設定器により指定される対地
作業機の設定高さに対地作業機を昇降制御し、高さ設定
器により指定される対地作業機の設定高さが、耕深設定
器により指定される対地作業機の設定高さより高けれ
ば、高さ設定器により指定される対地作業機の設定高さ
に対地作業機を昇降制御する。According to the lifting control device for a ground work machine of the present invention, when the mode switching means is switched to the height control side, the ground work machine is lifted and lowered to the height set by the height setting device. When the control is performed and the mode switching means is switched to the working depth control side, the set height of the ground working machine specified by the height setting device is set to the ground working machine specified by the working depth setting device. If the height is lower than the height, the ground work implement is vertically controlled to the set height of the ground work implement specified by the plowing depth setter, and the set height of the ground work implement specified by the height setter is set to the plowing depth setter. If the height is higher than the set height of the ground work machine specified by, the up / down control of the ground work machine is performed to the set height of the ground work machine specified by the height setter.
【０００７】よって、耕耘作業をするときは、モ−ド切
替手段を耕深制御側に切り替えて、高さ設定器を下位側
に設定し、耕深設定器を任意の耕深に設定して、作業を
開始する。このとき、高さ設定器により指定される対地
作業機の設定高さを対地作業機の下限高さとして、耕深
制御が行なわれる。なお、高さ設定器を最下位に設定し
ていれば、高さ設定器により指定される対地作業機の設
定高さが、耕深設定器により指定される対地作業機の設
定高さより必ず低くなるので、常時、耕深設定器により
指定される対地作業機の設定高さに対地作業機が昇降制
御される。Therefore, when performing plowing work, the mode switching means is switched to the plowing depth control side, the height setting device is set to the lower side, and the plowing depth setting device is set to an arbitrary plowing depth. , Start work. At this time, the plowing depth control is performed with the set height of the ground work implement designated by the height setter as the lower limit height of the ground work implement. If the height setter is set to the lowest level, the set height of the ground work implement specified by the height setter must be lower than the set height of the ground work implement specified by the working depth setter. Therefore, the ground work implement is always controlled to move up and down to the set height of the ground work implement designated by the tilling depth setting device.
【０００８】作業中、作業対象となる土壌の硬さが局所
的に硬くなって、作業負荷が急増し、エンジン回転が急
激に低下したり、エンストを起こしそうになった場合
は、高さ設定器を高位側に操作する。このとき、高さ設
定器により指定される対地作業機の設定高さが、耕深設
定器により指定される対地作業機の設定高さより高くな
るよう操作されれば、高さ設定器により指定される対地
作業機の設定高さに対地作業機を昇降制御されることに
なり、一時的に耕深を浅くして作業負荷を軽減し、エン
ジン回転の急激な低下に対応できエンストを防止でき
る。そして、土壌の硬い個所を通り過ぎたら、高さ設定
器を再び下位側に戻せば、もとの設定耕深に対地作業機
が昇降制御される状態に復帰する。During work, the hardness of the soil to be worked becomes locally hard, the work load sharply increases, the engine rotation sharply decreases, or the engine stall is likely to occur, the height is set. Operate the vessel to the high side. At this time, if the set height of the ground work implement specified by the height setter is higher than the set height of the ground work implement specified by the plowing depth setter, the height setter specifies the height. The ground work implement is controlled to move up and down to the set height of the ground work implement, and the working depth is temporarily reduced to reduce the work load, and it is possible to cope with a sudden decrease in engine rotation and prevent engine stall. Then, after passing through the hard portion of the soil, the height setting device is returned to the lower side again, and the ground working machine is returned to the state in which it is vertically controlled to the original set working depth.
【０００９】更に、未耕地を少なくするために畦直近か
ら対地作業を行なう場合、対地作業機を畦直近に下降さ
せたとき、耕深センサを取り付けている接地体等が畦に
乗り上げたりすると、その乗り上げた畦を圃場面と誤感
知して対地作業機が下降しなくなるが、このとき、モ−
ド切替手段を高さ制御側に切り替えれば、高さ設定器で
指定する対地作業機の設定高さに下降させることができ
る。Further, in the case of performing ground work from the nearest ridge in order to reduce uncultivated land, when the ground working machine is lowered to the nearest ridge, and the grounding body or the like having the working depth sensor mounted on the ridge, The landing implement was erroneously sensed as a field scene, and the ground work machine stopped descending.
By switching the switching means to the height control side, the height can be lowered to the set height of the ground work machine designated by the height setter.
【００１０】よって、この発明の対地作業機の昇降制御
装置は、モ−ド切替手段を耕深制御側に切り替えての耕
耘作業中に、耕深設定器の設定耕深を変えずに高さ設定
器を用いて一時的に耕深を調節できて、土壌の硬軟変化
による作業負荷の変動に容易に対応でき、且つ、対地作
業機を畦直近に下降させたときに、耕深センサを取り付
けている接地体等が畦に乗り上げてその畦を圃場面と誤
感知して対地作業機が下降しなくなった場合に、モ−ド
切替手段を高さ制御側に切り替えて、高さ設定器で指定
する対地作業機の設定高さに下降させることができ、畦
直近からの耕耘作業ができて未耕地部を少なくできる。Accordingly, the elevation control device for a ground working machine according to the present invention is capable of changing the height of the tiller without changing the set working depth of the working depth setting device during the tilling work by switching the mode switching means to the working depth control side. The working depth can be temporarily adjusted using the setting device, and it is possible to easily respond to changes in the work load due to changes in soil hardness, and a working depth sensor is installed when the ground work implement is lowered to the nearest ridge. If the grounding body, etc. on the ground rides on the ridge and the ridge is erroneously sensed as a field scene and the ground work machine does not descend, switch the mode switching means to the height control side and use the height setting device. It can be lowered to the set height of the designated ground work machine, and the cultivating work can be done from the nearest ridge and the uncultivated land can be reduced.
【００１１】[0011]
【発明の実施の形態】この発明の一実施例を図面に基づ
いて説明する。第２図に示すように、トラクタ１の後部
に対地作業機２の１例としてのロータリ耕耘装置を左右
１対のリフトアーム３，３へ、左右のリフトロッド４，
４を介して上下に揺動する左右のロワーリンク５，５及
び、中央上部のトップリンク６からなる作業機連結リン
ク機構７によって連結し、この作業機連結リンク機構７
は、そのリフトアーム３，３を、油圧を用いたリフトシ
リンダ８によって昇降回動させる油圧昇降機構９によっ
て昇降動作をするものである。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 2, a rotary tiller as an example of the ground working machine 2 is provided at the rear portion of the tractor 1 to the pair of left and right lift arms 3 and 3, and the left and right lift rods 4 and 4.
The work machine connecting link mechanism 7 is composed of the left and right lower links 5 and 5 swinging up and down via 4 and the top link 6 at the upper center.
The hydraulic lift mechanism 9 that lifts and lifts the lift arms 3 and 3 by a lift cylinder 8 using hydraulic pressure moves up and down.
【００１２】高さ制御において、油圧昇降機構９を昇降
制御する高さ設定器Ｉ1は、設定レバー１０の回動操作
によって操作されるボリューム１１にて構成され、リフ
トアーム３のリフト軸にその検出軸を連結しているポテ
ンショメータからなる高さセンサＳ1によって検出され
た高さ検出値が、設定レバー１０の回動操作によって高
さ設定器Ｉ1にて設定される高さ設定値に一致するま
で、マイクロコンピュータの如きものにて構成している
制御部１２が油圧昇降機構９を制御するものであって、
上昇用ソレノイド弁１３又は下降用ソレノイド弁１４の
オン又はオフ動作を、上昇用駆動部１５又は下降用駆動
部１６が制御部１２の出力指令に基づいて行うように構
成し、耕深制御における油圧昇降機構９の昇降制御を行
う耕深設定器Ｉ2は、設定ダイヤル１７の回動操作によ
って調節されるボリューム１８にて構成され、地表を摺
接できるように上下回動自在に対地作業機機体に螺着さ
れているリヤカバー１９の上下動作を、ポテンショメー
タからなる耕深センサＳ2によって検出して、この耕深
センサＳ2によって検出された耕深検出値が、設定ダイ
ヤル１７の回動操作によって耕深設定器Ｉ2にて設定さ
れる耕深設定値に一致するまで、制御部１２が上昇用ソ
レノイド弁１３又は下降用ソレノイド弁１４のオン、オ
フ動作を制御するものであり、作業モード切替スイッチ
２０を高さ制御位置２１に切替えたときに上記の高さ制
御が行われることになり、耕深制御位置２２に作業モー
ド切替スイッチ２０を置いたときは、耕深制御が行われ
るものであり、そして、作業切替スイッチ２３をオン動
作して作業状態に切替えた状態では、高さ設定器Ｉ1又
は耕深設定器Ｉ2の何れか高い位置を設定している設定
器によって指定されて設定高さに、対地作業機２の昇降
制御が行われるように制御部１２を構成したものであっ
て、即ち、高さ設定器Ｉ1により指定される対地作業機
２の設定高さが耕深設定器Ｉ2により指定される対地作
業機２の設定高さより低ければ、耕深設定器Ｉ2により
指定される対地作業機２の設定高さに対地作業機２が昇
降制御され、高さ設定器Ｉ1により指定される対地作業
機２の設定高さが耕深設定器Ｉ2により指定される対地
作業機２の設定高さより高ければ、高さ設定器Ｉ1によ
り指定される対地作業機２の設定高さに対地作業機２が
昇降制御されるよう制御部１２を構成したものである。In the height control, the height setting device I 1 for controlling the lifting / lowering of the hydraulic lifting mechanism 9 is composed of a volume 11 operated by the turning operation of the setting lever 10, and is mounted on the lift shaft of the lift arm 3. The height detection value detected by the height sensor S 1 composed of a potentiometer connecting the detection shafts matches the height set value set by the height setter I 1 by the turning operation of the setting lever 10. Until then, the control unit 12 constituted by a device such as a microcomputer controls the hydraulic lifting mechanism 9.
The ascending solenoid valve 13 or the descending solenoid valve 14 is configured to be turned on or off based on the output command of the control unit 12 by the ascending drive unit 15 or the descending drive unit 16, and the hydraulic pressure in the working depth control The working depth setting device I 2 for controlling the raising and lowering of the raising and lowering mechanism 9 is composed of a volume 18 which is adjusted by rotating the setting dial 17, and is vertically rotatable so that the ground surface can be slidably contacted. The up-and-down movement of the rear cover 19 that is screwed on is detected by a working depth sensor S 2 composed of a potentiometer, and the working depth detection value detected by this working depth sensor S 2 is set by rotating the setting dial 17. until it matches the tilling depth setting value set by tilling depth setting device I 2, the control unit 12 is on raising solenoid valve 13 or the lowering solenoid valve 14 also controls the off-operation The above height control is performed when the work mode changeover switch 20 is switched to the height control position 21, and when the work mode changeover switch 20 is placed at the working depth control position 22, the working depth is changed. Control is performed, and in the state where the work changeover switch 23 is turned on to switch to the working state, either the height setting device I 1 or the working depth setting device I 2 is set to the higher position. The control unit 12 is configured so that the elevation work control of the ground work implement 2 is performed at the set height designated by the setter, that is, the ground work implement 2 designated by the height setter I 1. if the setting height is lower than the set height of the ground working machine 2 is designated by the tilling depth setting device I 2, is ground working machine 2 to set the height of the ground working machine 2 is designated by the tilling depth setting device I 2 Elevation control is performed and designated by the height setter I 1. If the set height of the ground work implement 2 to be set is higher than the set height of the ground work implement 2 specified by the plowing depth setter I 2 , the set height of the ground work implement 2 specified by the height setter I 1 is set. The control unit 12 is configured so that the ground work machine 2 is vertically controlled.
【００１３】又、ボリュームの如きものにて構成してい
る上限設定器２４の回動動作によって設定した上限値
に、作業切替スイッチ２３のオフ動作時には対地作業機
２が上昇するように構成している。高さセンサＳ1は、
上記実施例のほか、例えばロワーリンク５の上下方向回
動角或はトップリンク６の上下回動角の検出する構造の
ものを用いても良く、種々のものを使用できる。Further, the ground work implement 2 is configured to be raised to the upper limit value set by the rotation operation of the upper limit setting device 24, which is constituted by a volume-like device, when the work changeover switch 23 is turned off. There is. The height sensor S 1 is
Other than the above embodiment, for example, a structure for detecting the vertical rotation angle of the lower link 5 or the vertical rotation angle of the top link 6 may be used, and various types can be used.
【図１】 制御回路図。FIG. 1 is a control circuit diagram.
【図２】 トラクタの側面図。FIG. 2 is a side view of the tractor.
【図３】 第１図における要部斜視図。FIG. 3 is a perspective view of a main part in FIG.
１：トラクタ ２：対地作業機 ７：作業機連結リンク機構 ９：油圧昇降機構 １２：制御部 ２０：作業モード切替スイッチ ２３：作業状態切替スイッチ ２４：上限設定器 Ｉ1：高さ設定器 Ｉ2：耕深設定器 Ｓ1：高さセンサ Ｓ2：耕深センサ1: Tractor 2: Ground work implement 7: Work implement connection link mechanism 9: Hydraulic lifting mechanism 12: Control unit 20: Work mode changeover switch 23: Work state changeover switch 24: Upper limit setting device I 1 : Height setting device I 2 : Plow depth setter S 1 : Height sensor S 2 : Plow depth sensor
Claims (1)
機を設け、高さ設定器による設定高さに高さセンサによ
る検出高さが一致するよう油圧昇降機構を制御する高さ
制御手段と、耕深設定器による設定耕深に耕深センサに
よる検出耕深が一致するよう油圧昇降機構を制御する耕
深制御手段とを備えた対地作業機の昇降制御装置におい
て、制御モ−ドを切替えるモ−ド切替手段を備え、該モ
−ド切替手段を高さ制御側に切り替えているときは、高
さ設定器による設定高さに対地作業機を昇降制御する構
成とし、モ−ド切替手段を耕深制御側に切り替えている
ときは、高さ設定器により指定される対地作業機の設定
高さが耕深設定器により指定される対地作業機の設定高
さより低ければ耕深設定器により指定される対地作業機
の設定高さに対地作業機を昇降制御し、高さ設定器によ
り指定される対地作業機の設定高さが耕深設定器により
指定される対地作業機の設定高さより高ければ高さ設定
器により指定される対地作業機の設定高さに対地作業機
を昇降制御する構成としたことを特徴とする対地作業機
の昇降制御装置。1. Height control means for controlling a hydraulic lifting mechanism such that a ground work machine is provided so as to be able to move up and down by a hydraulic lifting mechanism, and a height detected by a height sensor matches a height set by a height setter. In a lifting control device for a ground work machine, which is equipped with a working depth control means for controlling the hydraulic lifting mechanism so that the working depth set by the working depth setter matches the working depth detected by the working depth sensor, a mode for switching the control mode. -A mode switching means is provided, and when the mode switching means is switched to the height control side, the ground work implement is configured to be elevated and lowered to the set height by the height setting device, and the mode switching means is provided. When switching to the plowing depth control side, if the set height of the ground work implement specified by the height setter is lower than the set height of the ground work implement specified by the plowing depth setter, specify by the plowing depth setter. Ground work at the set height of the ground work machine If the set height of the ground work implement specified by the height setter is higher than the set height of the ground work implement specified by the plowing depth setter, then the ground work specified by the height setter is controlled. An elevation control device for a ground work machine, which is configured to control the elevation of the ground work machine to a set height of the machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24570395A JPH0984411A (en) | 1995-09-25 | 1995-09-25 | Ground work machine lifting control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24570395A JPH0984411A (en) | 1995-09-25 | 1995-09-25 | Ground work machine lifting control |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0984411A true JPH0984411A (en) | 1997-03-31 |
Family
ID=17137557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24570395A Pending JPH0984411A (en) | 1995-09-25 | 1995-09-25 | Ground work machine lifting control |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0984411A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2524146A (en) * | 2014-02-03 | 2015-09-16 | Deere & Co | Aerator with active turf calibration of ground sensor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH067003A (en) * | 1993-05-19 | 1994-01-18 | Iseki & Co Ltd | Hydraulic pressure change control unit in tractor |
-
1995
- 1995-09-25 JP JP24570395A patent/JPH0984411A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH067003A (en) * | 1993-05-19 | 1994-01-18 | Iseki & Co Ltd | Hydraulic pressure change control unit in tractor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2524146A (en) * | 2014-02-03 | 2015-09-16 | Deere & Co | Aerator with active turf calibration of ground sensor |
| US9510497B2 (en) | 2014-02-03 | 2016-12-06 | Deere & Company | Aerator with active turf calibration of ground sensor |
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