System for controlling the tilt of agricultural harvesters

Abstract

This invention relates to an agricultural harvester, including first and second fluid-driven actuators correspondingly coupled between a frame and first and second traction devices. Furthermore, the harvester includes a first fluid conduit extending between a control valve and a first fluid chamber of the first and second fluid-driven actuators. Additionally, the harvester includes a second fluid conduit extending between the control valve and a second fluid chamber of the first and second fluid-driven actuators. Furthermore, the harvester includes a valve assembly fluidly coupled to the first and second fluid conduits between the control valve and the first and second fluid-driven actuators. The valve assembly is then configured to selectively prevent fluid from flowing from the second fluid chamber of the first and second fluid-driven actuators to the control valve based on the pressure of the fluid within the first and second fluid conduits, thereby reducing the tilt of the agricultural harvester.

Description

Technical Field

[0001] This disclosure generally relates to agricultural harvesters, such as sugarcane harvesters, and more specifically, to systems for controlling the tilt of agricultural harvesters, for example, when an agricultural harvester is traveling across a sloping field surface. Background Technology

[0002] Agricultural harvesters typically include various suspension components to facilitate traversing fields. For example, agricultural harvesters often include fluid-driven actuators (e.g., hydraulic cylinders) connected between each of their wheels and their frame. In this regard, when an agricultural harvester travels across a field surface that slopes approximately perpendicular to its direction of travel, the harvester's center of gravity may shift downhill. This shift in the harvester's center of gravity increases the weight applied to the fluid-driven actuators located on the downhill side of the harvester and decreases the weight applied to the fluid-driven actuators located on the uphill side of the harvester. This, in turn, may cause the actuators on the downhill side of the harvester to retract and the actuators on the uphill side to extend, resulting in the harvester tilting or lateralizing. Therefore, systems have been developed for controlling the lateral tilt of agricultural harvesters in this situation. However, further improvements are needed.

[0003] Therefore, improved systems for controlling the tilt of agricultural harvesters would be technically welcome. Summary of the Invention

[0004] Various aspects and advantages of the invention will be set forth in part in the description which follows, or may become apparent from the description, or may be learned by practice of the invention.

[0005] In one aspect, this subject matter relates to an agricultural harvester, which includes a frame and first and second traction devices. Furthermore, the agricultural harvester includes a first fluid-driven actuator coupled between the harvester frame and the first traction device, the first fluid-driven actuator defining first and second fluid chambers. Additionally, the agricultural harvester includes a second fluid-driven actuator coupled between the harvester frame and the second traction device, the second fluid-driven actuator defining a first fluid chamber fluidly connected in parallel with the first fluid chamber of the first fluid-driven actuator. The second fluid-driven actuator further defines a second fluid chamber fluidly connected in parallel with the second fluid chamber of the first fluid-driven actuator. Furthermore, the agricultural harvester includes a control valve configured to control the flow of fluid to the first and second fluid-driven actuators. Additionally, the agricultural harvester includes a first fluid conduit extending between the control valve and the first fluid chambers of the first and second fluid-driven actuators, and a second fluid conduit extending between the control valve and the second fluid chambers of the first and second fluid-driven actuators. Furthermore, the agricultural harvester includes a valve assembly fluidly connected to first and second fluid conduits between a control valve and first and second fluid-driven actuators. The valve assembly is then configured to selectively prevent fluid from flowing from a second fluid chamber of the first and second fluid-driven actuators to the control valve based on the pressure of the fluid within the first and second fluid conduits, thereby reducing the tilt of the agricultural harvester.

[0006] In another aspect, this subject matter relates to a system for controlling the tilt of an agricultural harvester. The system includes a harvester frame and first and second traction devices. Furthermore, the system includes a first fluid-driven actuator coupled between the harvester frame and the first traction device, the first fluid-driven actuator defining first and second fluid chambers. Additionally, the system includes a second fluid-driven actuator coupled between the harvester frame and the second traction device, the second fluid-driven actuator defining a first fluid chamber fluidly connected in parallel with the first fluid chamber of the first fluid-driven actuator. The second fluid-driven actuator further defines a second fluid chamber fluidly connected in parallel with the second fluid chamber of the first fluid-driven actuator. Furthermore, the system includes a control valve configured to control the flow of fluid to the first and second fluid-driven actuators. Furthermore, the system includes a first fluid conduit extending between the control valve and the first fluid chambers of the first and second fluid-driven actuators, and a second fluid conduit extending between the control valve and the second fluid chambers of the first and second fluid-driven actuators. Furthermore, the system includes a valve assembly fluidly coupled to the first and second fluid conduits between the control valve and the first and second fluid-driven actuators. The valve assembly is then configured to selectively prevent fluid from flowing from the second fluid chamber of the first and second fluid drive actuators to the control valve based on the pressure of the fluid within the first and second fluid conduits, in order to reduce the tilt of the agricultural harvester.

[0007] These and other features, aspects, and advantages of the invention will be better understood by referring to the following description and the appended claims. Embodiments of the invention are illustrated in the accompanying drawings, which are incorporated in and form a part of this specification, and together with the specification serve to explain the principles of the invention. Attached Figure Description

[0008] The complete and feasible disclosure of the invention, including its preferred mode, is set forth in the description with reference to the accompanying drawings for those skilled in the art, wherein:

[0009] Figure 1 A simplified side view of one embodiment of an agricultural harvester according to various aspects of this subject is shown;

[0010] Figure 2 The illustration shows a schematic diagram of one embodiment of a system for controlling the tilt of an agricultural harvester according to various aspects of this subject matter;

[0011] Figure 3 The illustration shows a schematic diagram of another embodiment of a system for controlling the tilt of an agricultural harvester according to various aspects of this subject matter; and

[0012] Figure 4 The illustration shows a schematic diagram of yet another embodiment of a system for controlling the tilt of an agricultural harvester according to various aspects of this subject matter.

[0013] The repeated use of reference numerals in this specification and drawings is intended to indicate the same or similar features or elements of the invention. Detailed Implementation

[0014] Reference will now be made in detail to embodiments of the invention, one or more of which are illustrated in the accompanying drawings. Each example is provided by way of illustration rather than limitation. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the invention without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, it is intended that the invention cover such modifications and variations falling within the scope of the appended claims and their equivalents.

[0015] Generally, this subject matter relates to a system for controlling the tilting of an agricultural harvester, such as a sugarcane harvester. As described below, the harvester includes a first fluid-driven actuator (e.g., a hydraulic cylinder) coupled between the harvester frame and a first traction device (e.g., a first wheel). The first fluid-driven actuator then defines first and second fluid chambers. Furthermore, the harvester includes a second fluid-driven actuator coupled between the harvester frame and a second traction device (e.g., a second wheel). The second fluid-driven actuator then defines a first fluid chamber fluidly connected in parallel with the first fluid chamber of the first fluid-driven actuator. Furthermore, the second fluid-driven actuator further defines a second fluid chamber fluidly connected in parallel with the second fluid chamber of the first fluid-driven actuator. Additionally, the harvester includes a control valve configured to control the flow of fluid to both the first and second fluid-driven actuators.

[0016] In several embodiments, the disclosed system includes a valve assembly configured to control the tilt of a harvester. Specifically, in such embodiments, the system includes a first fluid conduit extending between a control valve and a first fluid chamber of a first fluid-driven actuator and a second fluid-driven actuator. Furthermore, the system includes a second fluid conduit extending between the control valve and a second fluid chamber of the first and second fluid-driven actuators. In this respect, the valve assembly is fluidly coupled to the first and second fluid conduits between the control valve and the first and second fluid-driven actuators. Thus, the valve assembly selectively prevents fluid from leaving the second fluid chambers of the first and second fluid-driven actuators based on fluid pressure within the first and second fluid conduits, thereby reducing the tilt of the agricultural harvester. For example, the valve assembly may be configured to selectively prevent fluid from leaving the second fluid chamber based on a first pilot flow rate indicating fluid pressure within the first fluid conduit and a second pilot flow rate indicating fluid pressure within the second fluid conduit. Therefore, the valve assembly may be configured as a single-balanced valve, a double-balanced valve, or an electrically locked valve.

[0017] By selectively controlling the flow of fluid from the second fluid chambers of the first and second fluid-driven actuators, the valve assembly improves the operation of the agricultural harvester. More specifically, when traveling across an inclined surface (particularly a surface inclined generally perpendicular to the direction of travel), the pressure within the first and second fluid conduits allows the valve assembly to prevent fluid from leaving the second fluid chambers of the actuators. This, in turn, prevents the actuators on the downhill side of the harvester from retracting and prevents the actuators on the uphill side from extending, thereby reducing the harvester's downhill lateral tilt or lean. Conversely, when traveling across a relatively flat surface, the pressure within the first and second fluid conduits allows the valve assembly to allow fluid to leave the second fluid chambers of the actuators. In this respect, when the harvester encounters ridges or turf fragments in the field, the fluid can be expelled from the second fluid chambers, thus absorbing the impact caused by the ridges / turf fragments. Therefore, the valve assembly allows the harvester to operate safely on steeper inclined surfaces while still allowing the fluid-driven actuators to absorb ridges / turf fragments when traveling across flat surfaces.

[0018] Now refer to the attached diagram, Figure 1 A side view of one embodiment of an agricultural harvester 10 according to various aspects of this subject matter is shown. As shown, the harvester 10 is configured as a sugarcane harvester. However, in other embodiments, the harvester 10 may correspond to any other suitable agricultural harvester known in the art.

[0019] As shown in the figure, the harvester 10 includes a frame 12 and a plurality of traction devices coupled to the frame 12. Generally, the traction devices can support the harvester 10 relative to the field surface and move the harvester 10 in a forward direction of travel (indicated by arrow 13). For example, in the illustrated embodiment, the traction devices are configured as a pair of front wheels 14 and a pair of rear wheels 16. As described below, the front wheels 14 are positioned in the lateral direction of the harvester 10 (as indicated by arrow 13). Figure 2 The rear wheels 16 are spaced apart from each other in the lateral direction 17 (indicated by arrow 17), and extend approximately perpendicular to the direction of travel 13. Similarly, the rear wheels 16 are also spaced apart from each other in the lateral direction 17. However, in an alternative embodiment, the traction device may be configured as a pair of track assemblies (not shown).

[0020] Furthermore, frame 12 can support one or more components of harvester 10. For example, frame 12 can support operator compartment 18 having various input devices (not shown) for controlling the operation of harvester 10. Additionally, frame 12 can support engine (not shown) and transmission (not shown). The engine then generates power, and the transmission transmits power to the front wheels 14 and / or rear wheels 16 (or their track assemblies) of harvester 10 to propel harvester 10 in the direction of travel 13.

[0021] In addition, the harvester 10 may include various components for cutting, processing, clearing, and discharging sugarcane as the harvester 10 travels through the farmland 20. For example, the harvester 10 may include a top cutter assembly 22 located at its front end to intercept sugarcane as the harvester 10 moves in the direction of travel 13. As shown, the top cutter assembly 22 may include a collection disc 24 and a cutting disc 26. The collection disc 24 may be configured to collect sugarcane stalks to allow the cutting disc 26 to cut off the top of each stalk. The height of the top cutter assembly 22 may be adjustable via a pair of arms 28, which may be hydraulically raised and lowered by the operator as needed.

[0022] Additionally, the harvester 10 may include a crop separator 30 extending upwards and backwards from the field 20. Typically, the crop separator 30 may include two helical feed rollers 32. The lower end of each feed roller 32 may then include a grounding shoe 34 to assist the crop separator 30 in collecting sugarcane stalks for harvesting. Furthermore, as... Figure 1 As shown, the harvester 10 may include a knocking roller 36 positioned near the front wheel 14 and a finned roller 38 positioned behind the knocking roller 36. As the knocking roller 36 rotates, the harvested sugarcane stalks are knocked down, and the crop separator 30 collects the stalks from the field 20. Furthermore, as... Figure 1 As shown, the finned roller 38 may include a plurality of intermittently installed fins 40 that help to push the sugarcane stalks downward. During harvesting, as the finned roller 38 rotates, the sugarcane stalks knocked down by the knocking roller 36 are separated and further knocked down by the finned roller 38 as the harvester 10 continues to move along the direction of travel 13 through the field 20.

[0023] Still referencing Figure 1 The harvester 10 may also include a base cutter assembly 42 positioned behind the finned roller 38. Generally, the base cutter assembly 42 may include blades (not shown) for cutting sugarcane stalks during harvesting. The blades, located around the periphery of the assembly 42, may be rotated by a hydraulic motor (not shown) powered by the vehicle's hydraulic system. Additionally, in several embodiments, the blades may be tilted downwards to cut the root of the sugarcane as it is knocked down by the finned roller 38.

[0024] In addition, the harvester 10 may include a feed roller assembly 44 located downstream of the base cutter assembly 42 for moving the cut sugarcane stalks from the base cutter assembly 42 along a processing path. Figure 1 As shown, the feed roller assembly 44 may include a plurality of bottom rollers 46 and a plurality of opposing top clamping rollers 48. The respective bottom and top rollers 46, 48 can be used to clamp the harvested sugarcane during transport. As the sugarcane is transported through the feed roller assembly 44, debris (such as rocks, dirt and / or the like) may fall onto the field 20 through the bottom rollers 46.

[0025] Additionally, the harvester 10 may include a chopper assembly 50 located at the downstream end of the feed roller assembly 44 (e.g., adjacent to the rearmost bottom and top feed rollers 46, 48). Typically, the chopper assembly 50 cuts or shreds the chopped sugarcane stalks into small pieces or billets, which may be, for example, six (6) inches in length. The billets can then be pushed toward the lift assembly 52 of the harvester 10 for delivery to an external receiver or storage device (not shown).

[0026] Debris (e.g., dust, dirt, leaves, etc.) separated from the sugarcane stubble can be discharged from the harvester 10 via a primary extractor 54, which is located behind the chopper assembly 50 and oriented to guide the debris outward from the harvester 10. Furthermore, an extractor fan 56 can be mounted at the base of the primary extractor 54 to generate sufficient suction or vacuum to pick up the debris and force it through the primary extractor 54. The separated or cleaned stubble, heavier than the debris discharged through the extractor 54, may then fall downward onto the lifter assembly 52.

[0027] like Figure 1 As shown, the lifter assembly 52 typically includes a lifter housing 58 and a lifter 60 extending within the lifter housing 58 between a lower proximal end 62 and an upper distal end 64. Typically, the lifter 60 may include an annular chain 66 and a plurality of scrapers or blades 68 attached to and evenly spaced along the annular chain 66. As the sugarcane billet travels along the top span 70 of the lifter 60, the blades 68 may be configured to hold the sugarcane billet on the lifter 60, the top span defined between the proximal end 62 and the distal end 64 of the lifter. Additionally, the lifter 60 may include a lower sprocket 72 and an upper sprocket 74 respectively located at its proximal and distal ends 62, 64. Figure 1 As shown, the elevator motor 76 can be coupled to one of the sprockets (e.g., upper sprocket 74) to drive the chain 66, thereby allowing the chain 66 and the blade 68 to travel in a circular loop between the proximal end 62 and the distal end 64 of the elevator 60. Furthermore, in one embodiment, the distal end 64 of the elevator 60 can be fixed relative to the elevator housing 58, such that the orientation or angle of the elevator 60 is generally not adjustable relative to the elevator housing 58. However, in an alternative embodiment, the distal end 64 of the elevator 60 can be adjustable relative to the elevator housing 58.

[0028] Furthermore, debris (e.g., dust, dirt, leaves, etc.) separated from the sugarcane billet during transport along the elevator 60 can be discharged from the harvester 10 via a secondary extractor 78 located at the rear end of the elevator housing 58. For example, as Figure 1As shown, the secondary extractor 78 can be located adjacent to the distal end 64 of the elevator 60 and can be oriented to guide the debris outward from the harvester 10. Furthermore, an extractor fan 80 can be mounted at the base of the secondary extractor 78 to generate sufficient suction or vacuum to pick up the debris and force it through the secondary extractor 78. The separated, cleaned billet, heavier than the debris discharged through the extractor 78, can then fall from the distal end 64 of the elevator 60. Typically, the billet can then be discharged from the harvester 10 through the discharge opening 82 of the elevator assembly 52 to an external receiver or storage device (not shown), for example, to a sugarcane billet cart. However, in an alternative embodiment, the harvester 10 may not include the secondary extractor 78.

[0029] During operation, the harvester 10 travels through the field 20 to harvest the sugarcane growing therein. After adjusting the height of the top cutter assembly 22 via the arm 28, the collecting disc 24 on the top cutter assembly 22 can collect the sugarcane stalks, while the cutter disc 26 cuts off the multi-leaved tops of the sugarcane stalks for disposal along either side of the harvester 10. As the stalks enter the crop separator 30, the grounding shoe 34 can set the operating width to determine the amount of sugarcane entering the throat of the harvester 10. The auger feed roller 32 then collects the stalks into the throat to allow the knockdown and finned rollers 36, 38 to bend the stalks downwards. Figure 1 As shown, once the stalk tilts downwards, the base cutter assembly 42 can cut the base of the stalk from the field 20. The cut stalk is then guided to the feed roller assembly 44 by the movement of the harvester 10.

[0030] The cut sugarcane stalks are conveyed rearward by bottom and top feed rollers 46, 48, which compress the stalks to make them more uniform and shake loose debris to pass through bottom roller 46 onto field 20. At the downstream end of feed roller assembly 44, shredder assembly 50 cuts or shreds the compressed sugarcane stalks into smaller pieces or billets (e.g., six-inch sugarcane segments). Then, airborne debris or chaff (e.g., dust, dirt, leaves, etc.) separated from the sugarcane billets during conveyance through feed roller assembly 44 is extracted by suction generated by extractor fan 56 through primary extractor 54. The separated / cleaned billets then fall downward into lifter assembly 52 and travel upward through lifter 60 from its proximal end 62 to its distal end 64. Once the billets reach the distal end 64 of lifter 60, they are conveyed to discharge opening 82 for discharge from harvester 10 to external receiver or storage device. Similar to the primary extractor 54, the chaff is blown out of the harvester 10 through the secondary extractor 78 with the help of the extractor fan 80.

[0031] It should also be understood that providing the above and Figure 1The construction of the agricultural harvester 10 shown is merely to place the subject matter in an exemplary field of application. Therefore, it should be understood that the subject matter can be readily applied to any harvester configuration.

[0032] Now for reference Figure 2 The illustration shows a schematic diagram of one embodiment of a system 100 for controlling the tilt of an agricultural harvester according to various aspects of this subject matter. Generally, this document will refer to the above references. Figure 1 The system 100 is described in connection with the agricultural harvester 10. However, those skilled in the art will understand that the disclosed system 100 can generally be used with agricultural harvesters having any other suitable harvester configuration.

[0033] like Figure 2 As shown, system 100 includes a plurality of fluid-driven actuators. Generally, each fluid-driven actuator is coupled between one of the traction devices and frame 12 to cushion oscillations or vibrations caused when the harvester 10 encounters bumps, turf fragments, or other surface irregularities as it travels through a field. Specifically, as described above, in several embodiments, the harvester 10 includes a pair of front wheels 14 spaced apart from each other in the lateral direction 17. In such an embodiment, a first fluid-driven actuator 102 may be coupled between axles 84 associated with one of the wheels 14, and a second fluid-driven actuator 104 may be coupled between axles 86 associated with the other wheel 14. System 100 will be described below in the context of the coupling of the first and second fluid-driven actuators 102, 104 to the front wheels 14. However, in alternative embodiments, the first and second fluid-driven actuators 102, 104 may be coupled between frame 12 and rear wheels 16. Furthermore, in further embodiments, the system may include any other suitable number of fluid-driven actuators. For example, in one embodiment, system 100 may include four fluid-driven actuators, each of which is coupled to one of the front wheel 14 and the rear wheel 16.

[0034] Typically, the first fluid-driven actuator 102 and the second fluid-driven actuator 104 can have any suitable configuration that allows the actuators 102, 104 to buffer oscillations or vibrations transmitted from the field surface to the harvester 10. Therefore, in several embodiments, the first and second fluid-driven actuators 102, 104 may include a cylinder 106 in which a movable piston 108 is located. A rod 110 is coupled to one side of each piston 108. In this respect, the cylinder 106 and the piston 108 define first and second fluid chambers 112, 114. In the illustrated embodiment, the first fluid chamber 112 corresponds to the rod-side chamber, and the second fluid chamber 114 corresponds to the cover-side chamber. Alternatively, the first fluid chamber 112 corresponds to the cover-side chamber, and the second fluid chamber 114 corresponds to the rod-side chamber. Furthermore, as shown, the first fluid chambers 112 of the first and second fluid-driven actuators 102, 104 are fluidly coupled together in parallel. Similarly, as shown, the second fluid chambers 112 of the first and second fluid-driven actuators 102, 104 are fluidly connected together in parallel. Furthermore, in the illustrated embodiment, rod 110 is connected to frame 12, and cylinder 106 is connected to shafts 84, 86. However, in an alternative embodiment, rod 110 may be connected to shafts 84, 86, and cylinder 106 may be connected to frame 12.

[0035] Controlling the fluid pressure within each of the first and second fluid chambers 112, 114 controls the extension and / or retraction of the lever 110 relative to the corresponding cylinder 106. For example, increasing the pressure within the first fluid chamber 112 of the first and second fluid actuators 102, 104 and / or decreasing the pressure within the second fluid chamber 114 of the first and second fluid actuators 102, 104 causes the lever 110 to retract into the cylinder 106, thereby moving the front wheel 14 closer to the frame 12. Conversely, decreasing the pressure within the first fluid chamber 112 of the first and second fluid actuators 102, 104 and / or increasing the pressure within the second fluid chamber 114 of the first and second fluid actuators 102, 104 causes the lever 110 to extend outward from the cylinder 106, thereby moving the front wheel 14 further away from the frame 12.

[0036] Furthermore, system 100 may include various fluid components for supplying fluid (e.g., hydraulic oil or air) from reservoir 116 to first and second fluid-driven actuators 102, 104. For example, system 100 may include pump 118 in fluid communication with reservoir 116 via pump conduit 120, such that pump 118 is configured to generate a pressurized fluid flow. Therefore, system 100 includes control valve 122 configured to control the flow of pressurized fluid generated by pump 118 to first and second fluid-driven actuators 102, 104. Additionally, system 100 may include first and second fluid conduits 124, 126. More specifically, first fluid conduit 124 may be coupled between control valve 122 and a first fluid chamber 112 of first and second fluid-driven actuators 102, 104. Similarly, second fluid conduit 126 may be coupled between control valve 122 and a second fluid chamber 114 of first and second fluid-driven actuators 102, 104. Therefore, control valve 122 can be configured to control the flow of pressurized fluid through first and second fluid conduits 124, 126 to regulate the extension / retraction of first and second fluid-driven actuators 102, 104. Although not shown, in some embodiments, system 100 may include one or more additional control valves and associated fluid conduits to supply fluid to other components or systems of harvester 10, such as top cutter assembly 22, crop divider 30, base cutter assembly 42, feed roller assembly 44, lifter assembly 52, and / or the like.

[0037] Furthermore, system 100 includes a valve assembly 128 fluidly coupled to first and second fluid conduits 124, 126. As shown, valve assembly 128 is fluidly coupled to the first and second fluid conduits 124, 126 between control valve 122 and first and second fluid drive actuators 102, 104. In this respect, valve assembly 128 is configured to selectively block fluid exit from a second fluid chamber 114 (e.g., a cover-side chamber) of the first and second fluid drive actuators 102, 104 to reduce the tilt of harvester 10. For example, in some embodiments, valve assembly 128 is configured to selectively prevent fluid exit from the second fluid chamber 114 based on fluid pressure within the first and second fluid conduits 124, 126. In such embodiments, valve assembly 128 may be controlled based on a first pilot flow rate indicating fluid pressure within the first fluid conduit 124 and a second pilot flow rate indicating fluid pressure within the second fluid conduit 126.

[0038] As the harvester 10 travels across a field surface that is inclined or skewed approximately perpendicular to the direction of travel 13, the center of gravity of the harvester 10 shifts to the downhill side of the harvester 10. For example, suppose the first fluid drive actuator 102 is on the downhill side of the harvester 10 and the second fluid drive actuator 104 is on the uphill side of the harvester 10. In this case, this shift of the center of gravity increases the magnitude of the force applied to the first fluid drive actuator 102. If fluid is forced out of the second fluid chamber 114 of the first fluid drive actuator 102 and through the second fluid conduit 126 due to this increased force, the first fluid drive actuator 102 will retract, further lowering the downhill side of the harvester 10 and increasing its roll. Roll, in turn, is the rotation of the harvester 10 about its longitudinal centerline (not shown), which extends in a forward / rear direction parallel to the direction of travel 13.

[0039] However, as described above, valve assembly 128 can be configured to reduce the tilt of harvester 10. More specifically, when the first fluid drive actuator 102 is on the downhill side of harvester 10 and the second fluid drive actuator 104 is on the uphill side of harvester 10, the pressure within the first and second fluid conduits 124, 126 causes valve assembly 128 to prevent fluid from leaving the second fluid chamber 114 of the first fluid drive actuator 102. That is, in this case, as described below, one or more components within valve 128 prevent fluid from flowing through the second fluid conduit 126 to control valve 122 and reservoir 116. Therefore, as harvester 10 travels along an inclined field surface, valve assembly 128 prevents fluid from leaving the second fluid chamber 114 of the downhill fluid drive actuator. This, in turn, minimizes the shift in the center of gravity of harvester 10 caused by traveling across an inclined surface, which would result in further tilting of harvester 10, thereby allowing harvester 10 to travel over steeper inclined surfaces.

[0040] Furthermore, valve assembly 128 allows the first and second fluid-driven actuators 102, 104 to absorb impacts when the harvester 10 encounters bumps, turf fragments, or other surface irregularities. Specifically, when the harvester 10 travels across a relatively flat surface, the pressure within the first and second fluid conduits 124, 126 allows valve assembly 128 to allow fluid to exit the second fluid chamber of the first and second fluid-driven actuators 102, 104. In this respect, when the harvester 10 encounters bumps or turf fragments in the field, fluid can be expelled from the second fluid chamber 114, thereby absorbing the impact caused by bumps / turf fragments. Therefore, valve assembly 128 allows the harvester 10 to operate safely on steeper, sloping surfaces while still allowing the first and second fluid-driven actuators 102, 104 to absorb bumps / turf fragments when traversing flat surfaces.

[0041] like Figure 2As shown, valve assembly 128 is configured as a single-balanced valve 130. Typically, the single-balanced valve 130 is configured to selectively block fluid flow through the second fluid conduit 126 based on first and second pilot flow rates. More specifically, the single-balanced valve 130 may include a flow regulator 132, with the first pilot flow acting on the flow regulator via the first pilot conduit 134, and the second pilot flow acting on the flow regulator via the second pilot conduit 136. In this respect, and as described above, the first pilot flow rate is associated with the fluid pressure within the first fluid conduit 124. Furthermore, the second pilot flow rate is associated with the fluid pressure within the second fluid conduit 126 between the balance valve 130 and the second fluid chamber 114 of the first and second fluid drive actuators 102, 104. Therefore, the flow regulator 132 can move between an open position and a closed position based on the pressure difference between the first and second pilot flow rates, in which fluid can exit the second fluid chamber 114 of the first and second fluid drive actuators 102, 104, and in the closed position, preventing fluid from exiting the second fluid chamber 114.

[0042] Additionally, the single balancing valve 130 may include a check valve 138. As shown, the check valve 138 is fluidly connected in parallel with the flow regulator 132 to a second fluid conduit 126 via a bypass conduit 140. In this respect, the check valve 138 prevents fluid from flowing from the second fluid chamber 114 of the first fluid-driven actuator 102 and the second fluid-driven actuator 104 to the control valve 122, thereby preventing such flow from bypassing the flow regulator 132 when it is in its closed position. However, the check valve 138 allows fluid to flow from the control valve 122 to the second fluid chamber 114 of the first and second fluid-driven actuators 102, 104, thereby allowing such flow to bypass the flow regulator 132.

[0043] As described above, the single balance valve 130 selectively prevents fluid from leaving the second fluid chamber 114 of the first and second fluid drive actuators 102, 104, thereby reducing the tilt of the harvester 10. More specifically, when the harvester 10 travels across a field surface that is inclined substantially perpendicular to the direction of travel 13, the fluid pressure in the second fluid conduit 126 increases while the fluid pressure in the first fluid conduit 124 decreases. This pressure difference can cause the flow regulator 132 to move to its closed position. In this case, the flow regulator 132 and the check valve 138 prevent fluid from leaving the second fluid chamber 114 of the first and second fluid drive actuators 102, 104. This, in turn, prevents the rod 110 of the fluid drive actuator on the downhill side of the harvester 10 from retracting into the corresponding cylinder 106 and prevents an increase in the tilt of the harvester 10. Therefore, the single balance valve 130 reduces the tilt of the harvester 10 when traveling on an inclined field surface.

[0044] Furthermore, the single balancing valve 130 allows the first and second fluid-driven actuators 102, 104 to absorb the impact caused when the harvester 10 encounters bumps, turf fragments, or other surface irregularities. Specifically, when the harvester 10 travels across a relatively flat surface, the pressure within the first and second fluid conduits 124, 126 can cause the flow regulator 132 to move to its open position. This, in turn, allows fluid to exit the second fluid chamber 114 of the first and second fluid-driven actuators 102, 104. In this respect, when the harvester 10 encounters bumps or turf fragments in the field, fluid can be expelled from the second fluid chamber 114, thereby absorbing the impact caused by the bumps / turf fragments.

[0045] Now for reference Figure 3 The illustration shows a schematic diagram of another embodiment of a system 100 for controlling the tilt of an agricultural harvester according to various aspects of this subject matter. Overall, Figure 3 The configuration of an embodiment of system 100 depicted is similar to Figure 2 An embodiment of the system 100 depicted herein. For example, similar to... Figure 2 The system 100 shown, Figure 3 The system 100 shown includes: first and second fluid-driven actuators 102, 104; a control valve 122; first and second fluid conduits 124, 126; and a valve assembly 128. However, with Figure 2 The system is 100 different, in Figure 3 In the illustrated system 100, the second fluid conduit 126 includes first and second conduit sections 142 and 144. Specifically, the first conduit section 142 extends between the second fluid chamber 114 of the first fluid-driven actuator 102 and the valve assembly 128. Furthermore, the second conduit section 144 extends between the second fluid chamber 114 of the second fluid-driven actuator 104 and the valve assembly 128. Additionally, the first and second conduit sections 142 and 144 are connected at a connector 145 within the valve assembly 128.

[0046] In addition, with Figure 2 The system is 100 different, in Figure 3 In the system 100 shown, valve assembly 128 is configured as a dual balancing valve 146. (The last sentence appears to be incomplete and possibly refers to a different system.) Figure 2Similar to the single-balanced valve 130 shown, the dual-balanced valve 146 includes a flow regulator 132, with a first pilot flow acting on the flow regulator via a first pilot conduit 134, and a second pilot flow acting on the flow regulator via a second pilot conduit 136. However, unlike the single check valve 138 of the single-balanced valve 130, the dual-balanced valve 146 includes four check valves 148, 150, 152, and 154. More specifically, the first check valve 148 is fluidly connected between the first fluid-driven actuator 102 and the connector 145 to a first conduit section 142 of the second fluid conduit 126. Furthermore, the second check valve 150 is fluidly connected between the second fluid-driven actuator 104 and the connector 145 to a second conduit section 144 of the second fluid conduit 126. As will be described below, the first and second check valves 148 and 150 together allow fluid at a higher pressure from either the first or second conduit sections 142 and 144 to be supplied to the flow regulator 132 and the second pilot conduit 136. Therefore, the second pilot flow indicates the greater of the fluid pressures within the first and second conduit sections 142 and 144.

[0047] Furthermore, the third check valve 152 is fluidly connected via a bypass conduit 156 between the first conduit section 142 of the second fluid conduit 126 and the portion of the second fluid conduit 126 located between the flow regulator 132 and the control valve 122. In this respect, the third check valve 152 prevents fluid from flowing from the second fluid chamber 114 of the first fluid-driven actuator 102 to the control valve 122, thereby preventing such flow from bypassing the flow regulator 132 when it is in its closed position. However, the third check valve 152 allows fluid to flow from the control valve 122 to the second fluid chamber 114 of the first fluid-driven actuator 102, thereby allowing such flow to bypass the flow regulator 132.

[0048] Furthermore, the fourth check valve 154 is fluidly connected via a bypass conduit 158 ​​between the second conduit section 144 of the second fluid conduit 126 and the portion of the second fluid conduit 126 located between the flow regulator 132 and the control valve 122. In this respect, the fourth check valve 154 prevents fluid from flowing from the second fluid chamber 114 of the second fluid-driven actuator 104 to the control valve 122, thereby preventing such flow from bypassing the flow regulator 132 when it is in its closed position. However, the fourth check valve 154 allows fluid to flow from the control valve 122 to the second fluid chamber 114 of the first fluid-driven actuator 102, thereby allowing such flow to bypass the flow regulator 132.

[0049] As described above, the dual balancing valve 146 selectively prevents fluid from leaving the second fluid chamber 114 of the first and second fluid drive actuators 102, 104, thereby reducing the tilt of the harvester 10. More specifically, when the harvester 10 travels across a field surface that is inclined or skewed approximately perpendicular to the direction of travel 13, the center of gravity of the harvester 10 shifts to the downhill side of the harvester 10. For example, suppose the first fluid drive actuator 102 is on the downhill side of the harvester 10 and the second fluid drive actuator 104 is on the uphill side of the harvester 10. In this case, the fluid pressure in the first conduit section 142 of the second fluid conduit 126 increases, and the fluid pressure in the second conduit section 144 of the second fluid conduit 126 decreases. Thus, the first and second check valves 148, 150 supply fluid from the first conduit section 142 to the flow regulator 132 and the second pilot conduit 136. Furthermore, in this case, the fluid pressure in the first fluid conduit 124 decreases. The pressure difference between the first conduit section 142 and the first fluid conduit 124 of the second fluid conduit 126 can move the flow regulator 132 to its closed position. In this state, the flow regulator 132, along with the third and fourth check valves 152, 154, prevents fluid from leaving the second fluid chamber 114 of the first fluid drive actuator 102. This, in turn, prevents the rod 110 of the actuator 102 from retracting into its cylinder 106 and prevents an increase in the tilt of the harvester 10. Thus, the dual balance valve 146 reduces the tilt of the harvester 10 when traveling on sloping field surfaces.

[0050] Furthermore, the dual balancing valve 146 allows the first and second fluid-driven actuators 102, 104 to absorb the impact caused when the harvester 10 encounters bumps, turf fragments, or other surface irregularities. Specifically, when the harvester 10 travels across a relatively flat surface, the pressure within the first fluid conduit 124 and the pressure within the first and second conduit sections 142, 144 of the second fluid conduit 126 can cause the flow regulator 132 to move to its open position. This, in turn, allows fluid to exit the second fluid chamber 114 of the first and second fluid-driven actuators 102, 104. In this respect, when the harvester 10 encounters bumps or turf fragments in the field, fluid can be expelled from the second fluid chamber 114, thereby absorbing the impact caused by bumps / turf fragments.

[0051] Now for reference Figure 4 The illustration shows a schematic diagram of another embodiment of a system 100 for controlling the tilt of an agricultural harvester according to various aspects of this subject matter. Overall, Figure 4 The configuration of an embodiment of system 100 depicted is similar to Figure 3 An embodiment of the system 100 depicted herein. For example, similar to... Figure 3 The system 100 shown, Figure 4The system 100 shown includes: first and second fluid-driven actuators 102, 104; a control valve 122; first and second fluid conduits 124, 126; and a valve assembly 128. Furthermore, with... Figure 3 The system 100 shown is similar, in Figure 4 In the system 100 shown, the second fluid conduit 126 includes first and second conduit sections 142, 144 connected together at a connector 145 within the valve assembly 128.

[0052] However, with Figure 2 The system is 100 different, in Figure 3 In the system 100 shown, valve assembly 128 is configured as an electrically controlled locking valve 160. As shown, the configuration of the electrically controlled locking valve 160 is similar to that of the double-balanced valve 146. For example, the electrically controlled locking valve 160 includes a flow regulator 132, a first pilot flow acting on the flow regulator via a first pilot conduit 134, and a second pilot flow acting on the flow regulator via a second pilot conduit 136. Furthermore, the electrically controlled locking valve 160 includes first, second, third, and fourth check valves 148, 150, 152, and 154, as well as bypass conduits 156 and 158. However, unlike the double-balanced valve 146, in the electrically controlled locking valve 160, the bypass conduit 158 ​​extends from a position on the second fluid conduit 126 between the connector 145 and the flow regulator 132 to a position on the second fluid conduit 126 between the flow regulator 132 and the control valve 122.

[0053] Furthermore, the electrically controlled locking valve 160 includes an electrically actuated bypass valve 162. As shown, the electrically actuated bypass valve 162 is fluidly connected in parallel with the flow regulator 132 to the second fluid conduit 126 via a bypass conduit 164. In this respect, the electrically actuated bypass valve 162 is movable between first and second positions 166, 168 (e.g., via an electrically controlled solenoid 170). When in the first position 166, the electrically actuated bypass valve 162 allows fluid to flow through the bypass conduit 164 in either direction. Conversely, when in the second position 168, the electrically actuated bypass valve 162 allows fluid to flow through the bypass conduit 164 from the control valve 122 to the first and second fluid drive actuators 102, 104, while preventing fluid from flowing through the bypass conduit 164 from the first and second fluid drive actuators 102, 104 to the control valve 122. In this respect, as will be described below, the electrically actuated bypass valve 162 can be actuated to allow fluid to bypass the flow regulator 132, regardless of the pressure and / or direction of the fluid flow through the first and second fluid conduits 124, 126.

[0054] Furthermore, system 100 may include a computing system 172 communicatively coupled to harvester 10 and / or one or more components of system 100 to allow the operation of these components to be electronically or automatically controlled by computing system 172. For example, computing system 172 may be communicatively coupled to electrically actuated bypass valve 162 of electrically controlled locking valve 160 via communication link 174. Thus, computing system 172 may be configured to control the operation of electrically actuated bypass valve 162 (e.g., its solenoid 170) to control when fluid can bypass flow regulator 132 within electrically controlled locking valve 160. Additionally, computing system 172 may be communicatively coupled to harvester 10 and / or any other suitable components of system 100.

[0055] In general, computing system 172 may include one or more processor-based devices, such as a given controller or computing device, or any suitable combination of controllers or computing devices. Therefore, in several embodiments, computing system 172 may include one or more processors 176 and associated memory devices 178 configured to perform a variety of computer-implemented functions. As used herein, the term "processor" refers not only to integrated circuits included in computers in the art, but also to controllers, microcontrollers, microcomputers, programmable logic circuits (PLCs), application-specific integrated circuits (ASICs), and other programmable circuits. Additionally, the memory 178 of computing system 172 may generally include one or more memory elements, including but not limited to computer-readable media (e.g., random access memory (RAM)), computer-readable non-volatile media (e.g., flash memory), magnetic disks, compressed optical disc read-only memory (CD-ROM), magneto-optical disks (MOD), digital versatile optical discs (DVDs), and / or other suitable storage elements. Such memory devices 178 may generally be configured to store suitable computer-readable instructions that, when implemented by processor 176, configure computing system 172 to perform a variety of computer-implemented functions, such as one or more aspects of the methods and algorithms described herein. In addition, the computing system 172 may include various other suitable components, such as communication circuits or modules, one or more input / output channels, data / control buses and / or the like.

[0056] The various functions of the computing system 172 can be executed by a single processor-based device, or they can be distributed across any number of processor-based devices, in which case these devices can be considered as forming part of the computing system 172. For example, the functions of the computing system 172 can be distributed across multiple dedicated controllers or computing devices, such as a navigation controller, an engine controller, a transmission controller, and / or the like.

[0057] In addition, system 100 may also include a user interface 180. More specifically, user interface 180 may be configured to receive input from an operator (e.g., input associated with desired operation of the electrically controlled locking valve 160). Therefore, user interface 180 may include one or more input devices, such as a touchscreen, keypad, touchpad, knob, button, slider, switch, mouse, microphone, and / or the like, configured to receive user input from the operator. User interface 180 may also be communicatively coupled to computing system 172 via communication link 174 to allow received input to be transmitted from user interface 180 to computing system 172. Furthermore, some embodiments of user interface 180 may include one or more feedback devices (not shown), such as a display screen, speaker, warning light, and / or the like, configured to provide feedback from computing system 172 to the operator. In one embodiment, user interface 180 may be mounted or otherwise positioned within the operator compartment 18 of harvester 10. However, in alternative embodiments, user interface 180 may be mounted in any other suitable location.

[0058] As mentioned above, Figure 4 The configuration of the electronically controlled locking valve 160 shown is similar to Figure 3 The dual-balance valve 146 is shown. In this respect, the electrically controlled locking valve 160 can control the flow of fluid into and out of the second fluid chamber 114 of the first fluid-driven actuator 102 and the second fluid-driven actuator 104 in a similar manner to that described above. Therefore, the electrically controlled locking valve 160 can be fluidly (e.g., hydraulically) controlled to selectively prevent fluid from leaving the second fluid chamber 114 of the first and second fluid-driven actuators 102 and 104 based on the pressure within the first and second fluid conduits 124, 126, similar to the dual-balance valve 146 described above. However, as mentioned above, the electrically controlled locking valve 160 includes an electrically actuated bypass valve 162. In this respect, the computing system 172 can control the operation of the electrically actuated bypass valve 162 to allow fluid to leave the second fluid chamber 114 if the flow regulator 132 otherwise blocks such flow. Therefore, the fluid-based control of the electrically controlled locking valve 160 can be overridden to allow fluid to leave the second fluid chamber, even if such flow is blocked by the flow regulator 132.

[0059] In some embodiments, the operator of the harvester 10 can manually control the operation of the electrically controlled locking valve 160 via a user interface 180. More specifically, the operator can provide one or more inputs to the user interface 180, indicating the desired operation of the electrically controlled locking valve 160. The computing system 172 can then receive the operator inputs from the user interface 180 via a communication link 174. Subsequently, the computing system 172 can control the operation of the electrically actuated bypass valve 162 based on the received operator inputs.

[0060] For example, in one embodiment, the user interface 180 may include an on / off switch or other interface elements (not shown). When the operator moves the on / off switch to the "on" position, the computing system 172 controls the operation of the electrically actuated bypass valve 162, causing the valve 162 to move to a second position 168. In this case, the electrically actuated locking valve 160 prevents fluid from leaving the second fluid chamber 114 of the first and second fluid drive actuators 102, 104 based on the pressure within the first and second fluid conduits 124, 126. Conversely, when the operator moves the on / off switch to the "off" position, the computing system 172 controls the operation of the electrically actuated bypass valve 162, causing the valve 162 to move to a first position 166. In this case, the electrically actuated bypass valve 162 allows fluid to leave the second fluid chamber 114 when the flow regulator 132 otherwise prevents such flow. Therefore, the operator can manually enable or override fluid-based control of the electrically actuated locking valve 160.

[0061] Alternatively or additionally, the computing system 172 may be configured to control the operation of the electronically actuated bypass valve 162 based on received sensor data (e.g., from an inclinometer (not shown)).

[0062] As used herein, the term "software code" or "code" refers to any instruction or set of instructions that affects the operation of a computer or controller. These may exist in the following forms: computer-executable forms, such as machine code, which is a collection of instructions and data that is directly executed by the computer's central processing unit or controller; human-understandable forms, such as source code, which may be compiled for execution by the computer's central processing unit or controller; or intermediate forms, such as object code, which is generated by a compiler. As used herein, the term "software code" or "code" also includes any human-understandable computer instructions or set of instructions, such as scripts, which may be dynamically executed with the aid of an interpreter executed by the computer's central processing unit or controller.

[0063] This written description uses examples to disclose the techniques of the invention, including the best mode, and also enables those skilled in the art to practice the techniques of the invention, including making and using any device or system and performing any combined methods. The patent scope of the techniques of the invention is defined by the claims and may include other examples that may occur to those skilled in the art. Such other examples are intended to be included within the scope of the claims if they comprise structural elements that are not different from the literal language of the claims, or if they comprise equivalent structural elements that are not substantially different from the literal language of the claims.

Claims

1. An agricultural harvester, comprising: frame; First traction device and second traction device; A first fluid-driven actuator is coupled between the harvester frame and the first traction device, the first fluid-driven actuator defining a first fluid chamber and a second fluid chamber; A second fluid-driven actuator is connected between the harvester frame and the second traction device. The second fluid-driven actuator defines a first fluid chamber fluidly connected in parallel with a first fluid chamber of the first fluid-driven actuator, and the second fluid-driven actuator further defines a second fluid chamber fluidly connected in parallel with a second fluid chamber of the first fluid-driven actuator. A control valve configured to control the flow of fluid to a first fluid-driven actuator and a second fluid-driven actuator; A first fluid conduit extends between a control valve and a first fluid chamber of a first fluid-driven actuator and a first fluid chamber of a second fluid-driven actuator; A second fluid conduit extends between the control valve and the second fluid chamber of the first fluid actuator and the second fluid chamber of the second fluid actuator; as well as A valve assembly fluidly connected between a control valve and a first fluid-driven actuator and a second fluid-driven actuator to a first fluid conduit and a second fluid conduit, the valve assembly being configured to selectively prevent fluid from flowing from the second fluid chamber of the first fluid-driven actuator and the second fluid chamber of the second fluid-driven actuator to the control valve based on the pressure of the fluid within the first fluid conduit and the second fluid conduit, thereby reducing the tilt of an agricultural harvester; The valve assembly is configured to selectively prevent fluid from flowing from the second fluid chamber of the first fluid drive actuator and the second fluid chamber of the second fluid drive actuator to the control valve based on a first pilot flow indicating the pressure of fluid in the first fluid conduit and a second pilot flow indicating the pressure of fluid in the second fluid conduit.

2. The agricultural harvester according to claim 1, wherein the valve assembly includes a single balance valve.

3. The agricultural harvester according to claim 1, wherein the second fluid conduit includes a first conduit section fluidly connected between the second fluid chamber of the first fluid drive actuator and the valve assembly, and the second fluid conduit further includes a second conduit section fluidly connected between the second fluid chamber of the second fluid drive actuator and the valve assembly.

4. The agricultural harvester according to claim 3, wherein the second pilot flow indicates the greater of the fluid pressure in the first conduit section of the second fluid conduit or the fluid pressure in the second conduit section of the second fluid conduit.

5. The agricultural harvester according to claim 4, wherein the valve assembly includes a dual balance valve.

6. The agricultural harvester according to claim 1, wherein the valve assembly includes an electrically controlled locking valve.

7. The agricultural harvester according to claim 6, further comprising: The computing system is configured to control the operation of the electronically controlled locking valve to reduce the tilt of the agricultural harvester.

8. The agricultural harvester according to claim 7, further comprising: The user interface, whose communication connection is to the computing system, is further configured to: Receive operator input from the user interface; and The operation of the electrically controlled locking valve is controlled based on the received operator input.

9. The agricultural harvester according to claim 1, wherein the first traction device and the second traction device are spaced apart from each other along the lateral direction of the agricultural harvester, the lateral direction extending perpendicular to the direction of travel of the agricultural harvester.

10. The agricultural harvester according to claim 1, wherein the first traction device and the second traction device comprise a first wheel and a second wheel.

11. A system for controlling the tilt of an agricultural harvester, the system comprising: Harvester frame; First traction device and second traction device; A first fluid-driven actuator is coupled between the harvester frame and the first traction device, the first fluid-driven actuator defining a first fluid chamber and a second fluid chamber; A second fluid-driven actuator is connected between the harvester frame and the second traction device. The second fluid-driven actuator defines a first fluid chamber fluidly connected in parallel with a first fluid chamber of the first fluid-driven actuator, and the second fluid-driven actuator further defines a second fluid chamber fluidly connected in parallel with a second fluid chamber of the first fluid-driven actuator. A control valve configured to control the flow of fluid to a first fluid-driven actuator and a second fluid-driven actuator; A first fluid conduit extends between a control valve and a first fluid chamber of a first fluid-driven actuator and a first fluid chamber of a second fluid-driven actuator; A second fluid conduit extends between the control valve and the second fluid chamber of the first fluid actuator and the second fluid chamber of the second fluid actuator; as well as A valve assembly fluidly connected between a control valve and a first fluid-driven actuator and a second fluid-driven actuator to a first fluid conduit and a second fluid conduit, the valve assembly being configured to selectively prevent fluid from flowing from the second fluid chamber of the first fluid-driven actuator and the second fluid chamber of the second fluid-driven actuator to the control valve based on the pressure of the fluid within the first fluid conduit and the second fluid conduit, thereby reducing the tilt of an agricultural harvester; The valve assembly is configured to selectively prevent fluid from flowing from the second fluid chamber of the first fluid drive actuator and the second fluid chamber of the second fluid drive actuator to the control valve based on a first pilot flow indicating the pressure of fluid in the first fluid conduit and a second pilot flow indicating the pressure of fluid in the second fluid conduit.

12. The system of claim 11, wherein the valve assembly comprises a single balancing valve.

13. The system of claim 11, wherein the second fluid conduit includes a first conduit section fluidly connected between the second fluid chamber of the first fluid drive actuator and the valve assembly, and the second fluid conduit further includes a second conduit section fluidly connected between the second fluid chamber of the second fluid drive actuator and the valve assembly.

14. The system of claim 13, wherein the second pilot flow indicates the greater of the fluid pressure in the first conduit section of the second fluid conduit or the fluid pressure in the second conduit section of the second fluid conduit.

15. The system of claim 14, wherein the valve assembly comprises a dual balancing valve.

16. The system of claim 11, wherein the valve assembly includes an electrically controlled locking valve.

17. The system of claim 16, further comprising: The computing system is configured to control the operation of the electronically controlled locking valve to reduce the tilt of the agricultural harvester.

18. The system of claim 11, wherein the first traction device and the second traction device are spaced apart from each other in a lateral direction of the harvester, the lateral direction extending perpendicular to the direction of travel of the harvester.

Images