Patent Application
20200049173
The present invention relates generally to off-highway implements having hydraulic systems, and more particularly, to implements having electronically controlled valves for controlling hydraulic fluid with respect to a hydraulic actuator in which the valves are controlled in an operation to enable filtering of the fluid by either blocking the fluid with respect to the valves and cylinders while a dedicated return valve is controlled to return the fluid to a connector via a return line.
There are a wide variety of off-highway implements which utilize hydraulic power. One example is a tillage implement for preparing soil for planting in which hydraulic power is used to raise and lower tillage shanks. Such implements often receive hydraulic power through hoses with “quick connect couplings” which may be arranged at a central manifold. To conduct off-highway operations, the manifold can be connected to an external hydraulic power source for operating the implement, such as a tractor pulling the implement. However, over time, contaminants in the hydraulic fluid which may enter through the “quick connect couplings” can cause damage to various seals, valves, cylinders and other components. This can potentially lead to pressure intensification, leaks and/or ultimately loss of hydraulic power. A need therefore exists to efficiently enable filtering of such contaminants to minimize one or more of the aforementioned drawbacks.
The present inventors have recognized that contaminants in hydraulic fluid in a hydraulic system of an off-highway implement can be efficiently filtered by a filtration system of the source of hydraulic power by conducting an operation which controls existing valves of the system to block the fluid from going through such valves or precisely operated cylinders controlled by such valves while a dedicated return valve returns the fluid to the source of hydraulic power through a connector. Such an operation can be advantageously executed immediately following connection of the source of hydraulic power to the manifold of the implement.
One aspect can provide a bypass circuit in which an addition of hydraulic valves is used to flush contaminated oil from fluid lines connecting a tractor to an implement back to the tractor filtration system prior to being directed to the implement hydraulic circuit along with control software to operate such hydraulic valves. This essentially provides a bypass circuit. Accordingly, this system can flush contaminated oil from high pressure hydraulic fluid lines that connect the tractor to the implement. This is accomplished by bypassing the fluid directly back to the tractor filtration system where it is cleaned. The bypass is created by a hydraulic valve which diverts the oil from the implement hydraulic circuit and sends it to the tractor filtrations system. The software control system engages the tractor operator to perform certain functions to facilitate the flushing of the critical circuits.
Specifically then, one aspect of the present invention can provide an off-highway implement, including: a frame supported by wheels; a set of ground engaging tools supported by the frame, the set of ground engaging tools including a hydraulic cylinder arranged with respect to the frame for raising and lowering the set of ground engaging tools, the hydraulic cylinder including a base, a base port, a rod and a rod port, in which the rod is configured to extend from the base when hydraulic fluid is supplied to the base port and returned from the rod port, and in which the rod is configured to retract toward the base when hydraulic fluid is supplied to the rod port and returned from the base port; a connector configured to supply hydraulic fluid in a supply line and return hydraulic fluid in a return line when connected to a hydraulic power source; multiple electronically controlled valves, the valves including a first valve configured to supply hydraulic fluid from the supply line to the hydraulic cylinder when activated, a second valve configured to return hydraulic fluid from the hydraulic cylinder to the return line when activated, and a third valve configured to bypass the first and second valves by redirecting hydraulic fluid from the supply line to the return line when deactivated; and a controller in communication with the plurality of valves, the controller executing a program stored in a non-transient medium to: execute an operation to enable filtering of the hydraulic fluid supplied through the connector by simultaneously deactivating the first and second valves to block hydraulic fluid with respect to the hydraulic cylinder while deactivating the third valve to redirect hydraulic fluid from the supply line to the return line.
Other aspects, objects, features, and advantages of the invention will become apparent to those skilled in the art from the following detailed description and accompanying drawings. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the present invention, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the present invention without departing from the spirit thereof, and the invention includes all such modifications.
Preferred exemplary embodiments of the invention are illustrated in the accompanying drawings in which like reference numerals represent like parts throughout.
These and other features and advantages of the invention will become apparent to those skilled in the art from the following detailed description and the accompanying drawings. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the present invention, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the present invention without departing from the spirit thereof, and the invention includes all such modifications.
Referring now to the drawings, and more particularly to
The frame 16 can be supported by multiple wheels 24. The wheels 24 can be pivoted between a field operation position and a transport position by hydraulic cylinders associated with the wheels. The frame 16, in turn, can support multiple ground engaging tools 30 useful for field operations, including first, second and third sets of ground engaging tools 30a, 30b and 30c, respectively. In one aspect, the first set of ground engaging tools 30a could comprise tillage shanks for ripping compacted soil; the second set of ground engaging tools 30b could comprise disc blades for cutting off-highway residue, such as corn stalks, arranged forward of the tillage shanks; and the third set of ground engaging tools 30c could comprise leveling discs for distributing soil, and/or baskets (or “crumblers”) for breaking large soil clods, arranged rearward of the tillage shanks.
Each set of ground engaging tools includes one or more hydraulic cylinders 40 arranged with respect to the frame 16. The hydraulic cylinders 40 are configured to raise and lower each respective set of ground engaging tool 30 with respect to the frame 16. Accordingly, each set of ground engaging tools 30 can be configured to engage the ground at a ground engaging depth (“D”), when lowered by respective hydraulic cylinders 40, to be in contact with the ground. For example, the first set of ground engaging tools 30a can include cylinders 40a and 40a′ (identified as “C1 LH” and “C1 RH” on left and right sides, respectively, and as “C1” collectively) for raising and lowering the tillage shanks for engaging the ground at a tillage ground engaging depth “D1;” the second set of ground engaging tools 30b can include a cylinder 40b (identified as “C2”) for raising and lowering the disc blades for engaging the ground at a disc blade ground engaging depth “D2;” and the third set of ground engaging tools 30c can include cylinders 40c and 40c′ (identified as “C3 LH” and “C3 RH” on left and right sides, respectively, and as “C3” collectively, mechanically linked through a rockshaft, but hydraulically plumbed in parallel) for raising and lowering the leveling discs and/or baskets for engaging the ground at a leveling ground engaging depth “D3.” In addition, a hydraulic cylinder 40d (identified as “C4”) can be arranged with respect to the frame 16 for changing an angle of the frame 16 (identified as “D4”) with respect to the ground, preferably for leveling the frame 16 with respect to the hitch 18 and the tractor 12.
In operation, retracting C1 lowers the frame 16 (and the first set 30a), whereas extending C1 raises the frame 16; extending C2 raises the disc blades (the second set 30b), whereas retracting C2 lowers the disc blades; extending C3 raises the leveling discs and/or baskets (the third set 30c), whereas retracting C3 lowers the leveling discs and/or baskets; and extending C4 pitches the implement 14 forward (angle of the frame 16), whereas retracting C4 pitches the implement 14 rearward.
With additional reference to
Referring now to
While valves A and B are present to supply and return fluid with respect to the rod port of the cylinder 40, respectively, valves D and E can be present to supply and return fluid with respect to the base port of the same cylinder 40, respectively. Valves D and E can also be single direction, proportional control valves configured to meter hydraulic fluid for fine adjustment of the cylinder 40. In addition, the manifold 82 can include a second connector 112 that may also include “quick-connect” style connectors for connecting additional hoses 80 from the hydraulic power source 61. The valve system 56 can include a valve “F” configured to supply and return hydraulic fluid with respect to the rod port of the cylinder 40 and a first transport line of the second connector 112 (“Lower EHR,” or Lower Electrohydraulic Remote) when deactivated, such as the rod ports of C1 RH and C1 LH; and a valve “G” configured to supply and return hydraulic fluid with respect to the base port of the one or more hydraulic cylinders 40 and a second transport line of the second connector 112 (“Raise EHR,” or Raise Electrohydraulic Remote) when deactivated. The valves F and G can be bi-directional, on-off valves without proportional control for course adjustment of a hydraulic cylinder or to isolate valves A, B, D, & E from Lower and Raise EHR. The valve system 56 can also include a valve “H” configured to bypass the valve F by redirecting hydraulic fluid from the first transport line (Lower EHR) to the return line R when deactivated (
Accordingly, the controller 60 can further execute to enable filtering of the hydraulic fluid supplied through the connector 112 for coarse control by simultaneously deactivating valve H to redirect hydraulic fluid from the first transport line (Lower EHR) to the return line R (while valves A, B, C, D, and E are deactivated and valves I, F, and G are activated) during the first operation 100. Then, with additional reference to
As a result, contaminants in the fluid can be efficiently filtered by the filtration system 65 by conducting one or more of the aforementioned operations blocking fluid from going through cylinders 40 and valves A, B, D, E, F and/or G for precisely controlling such cylinders 40 by using one or more of dedicated return valves C, H and/or I to return the fluid to the hydraulic power source 61 through connectors 102 and/or 112. Moreover, such aforementioned operations can be advantageously executed immediately following connection of the hydraulic power source 61 to the manifold 82.
Although the best mode contemplated by the inventors of carrying out the present invention is disclosed above, practice of the above invention is not limited thereto. It will be manifest that various additions, modifications and rearrangements of the features of the present invention may be made without deviating from the spirit and the scope of the underlying inventive concept.
