A load sensing system and new energy tractor

Abstract

The present invention relates to a load-sensitive system and a new energy tractor, the load-sensitive system comprises a controller, a multi-way valve, an oil inlet pipeline, an oil return pipeline and a power unit with adjustable flow, the multi-way valve is provided with an oil inlet P, an oil return port T and at least one pair of interfaces A and B, the oil inlet P is connected with the interface A and the oil return port T is connected with the interface B, or the oil inlet P is connected with the interface B and the oil return port T is connected with the interface A, or the oil return port T is respectively connected with the interface A and the interface B; one end of the oil inlet pipeline is connected with the oil inlet P, and the other end is connected with the power unit; one end of the oil return pipeline is connected with the oil return port T, and the other end is used to connect with the oil tank; the multi-way valve and the power unit are respectively connected with the controller through a wiring harness. The beneficial effects of the present invention are simple structure, reasonable design, adjustable speed of the driving motor, ensuring that the output flow of the gear pump is equal to the required flow of the multi-way valve, saving energy consumption, and greatly improving work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of tractors, and in particular to a load sensing system and a new energy tractor. Background Art

[0002] The development trend of new energy electric tractors is towards electrification and intelligence to improve agricultural production efficiency and quality. With the global emphasis on environmental protection and sustainable development, new energy electric tractors, as a clean and efficient agricultural machinery, are gradually becoming a new trend in the agricultural machinery industry. Electric tractors have the advantages of zero emissions, low noise, and low maintenance costs, which are in line with the green and environmentally friendly development trend of modern agriculture.

[0003] With the continuous development of intelligent, automated and battery technologies, new energy electric tractors will gradually realize functions such as precision operation and intelligent control, thereby improving agricultural production efficiency and quality. In addition, the research and development and application of electric tractors will not only help reduce environmental pollution, but also significantly reduce fuel consumption in the agricultural production process, reduce emissions, protect the ecological environment, and reduce tractor noise and vibration, improve user comfort, and lay a good foundation for the digital and intelligent development of tractors.

[0004] The development of electric tractors also draws on the successful experience of electric vehicles, including progress in battery technology, drive motor technology, and control technology. The development of battery technology, such as the progress from lead-acid batteries to alkaline batteries, and the development of fuel cells, are all promoting the performance of electric tractors. In terms of drive motor technology, the drive motor used in electric agricultural machinery should have characteristics such as a wide speed regulation range, high speed, large starting torque, high efficiency, strong dynamic braking, and energy feedback. With the development of electric motors and drive systems, motor control systems are becoming more intelligent and digital. In terms of control technology, including battery power management, drive motor control, operation data collection, analysis, and action command feedback, the whole machine is managed and controlled automatically and intelligently through relevant parameters and sensor data.

[0005] To sum up, the development trend of new energy electric tractors is towards a more environmentally friendly, efficient and intelligent direction, which not only helps to improve agricultural production efficiency, but is also an important direction for sustainable agricultural development.

[0006] At present, the new energy tractors in the prior art have the following technical problems:

[0007] 1. The variable piston pump is noisy, especially on new energy electric tractors.

[0008] 2. The quantitative gear pump has low noise, but the quantitative pump is a load-sensitive system and consumes too much energy. Summary of the invention

[0009] The present invention provides a load sensing system and a new energy tractor, aiming to solve the problems in the prior art.

[0010] The technical solution of the present invention to solve the above technical problems is as follows:

[0011] A load-sensing system comprises a controller, a multi-way valve, an oil inlet pipeline, an oil return pipeline and a power unit with adjustable flow, wherein the multi-way valve is provided with an oil inlet P, an oil return port T and at least one pair of interfaces A and B, wherein the oil inlet P is connected to the interface A and the oil return port T is connected to the interface B, or the oil inlet P is connected to the interface B and the oil return port T is connected to the interface A, or the oil return port T is connected to the interface A and the interface B respectively; the interface A and the interface B are used to connect the oil inlet and the oil return port of the machine respectively;

[0012] One end of the oil inlet pipeline is connected to the oil inlet port P, and the other end is connected to the power unit; one end of the oil return pipeline is connected to the oil return port T, and the other end is used to connect to the oil tank; the multi-way valve and the power unit are respectively connected to the controller through a wiring harness.

[0013] The beneficial effect of the present invention is that during use, the controller can control the power unit to adjust the flow of oil to ensure that the output oil flow is equal to the required flow of the multi-way valve, thereby saving energy consumption and greatly improving work efficiency.

[0014] Based on the above technical solution, the present invention can also be improved as follows.

[0015] Further, the multi-way valve includes at least one multi-way multi-port valve having the same number as the interface A and the interface B, and each of the multi-way multi-port valves is provided with oil port 1, oil port 2, oil port 3 and oil port 4, the oil port 1 is connected with the oil port 3 and the oil port 2 is connected with the oil port 4, or the oil port 1 is connected with the oil port 4 and the oil port 2 is connected with the oil port 3;

[0016] The oil port 1 is connected to the oil inlet P through a pipeline, the oil port 2 is connected to the oil return port T through a pipeline, the oil port 3 is connected to the interface A through a pipeline, and the oil port 4 is connected to the interface B through a pipeline;

[0017] One end of the multi-way multi-port valve is connected to the wiring harness via a line, on which a valve core displacement sensor is fixedly installed; one end of the multi-way multi-port valve is installed with a driving component for driving the valve core to operate, and the driving component is connected to the wiring harness via a line.

[0018] The beneficial effect of adopting the above further scheme is that during use, the valve core displacement sensor feeds back the displacement signal of the valve core of the multi-way multi-port valve to the controller via the wiring harness. After the controller calculates the required flow of the multi-way valve, it controls the flow output by the power unit, thereby achieving an output flow equal to the required flow of the multi-way valve, preventing excess flow from generating heat, causing energy loss, and saving energy consumption.

[0019] Furthermore, the multi-way valve comprises a plurality of the multi-way multi-port valves, the plurality of the multi-way multi-port valves are arranged in parallel, and the maximum displacement values ​​of the valve cores of the plurality of the multi-way multi-port valves are consistent or inconsistent.

[0020] The beneficial effect of adopting the above further solution is that the structure is simple, and the multi-way multi-port valve can be connected to multiple different machines to perform different operations, making the operation more convenient.

[0021] Furthermore, the driving component includes a gear, a rack and a valve core driving motor, the rack is inserted into one end of the multi-way multi-port valve, and one end thereof extends into the multi-way multi-port valve and is fixedly connected to the valve core; the valve core driving motor is fixedly arranged, and is connected to the wiring harness through a line, and the gear is fixedly sleeved on the driving end of the valve core driving motor, and is meshed with the rack.

[0022] The beneficial effect of adopting the above further scheme is that the displacement of the gear pump is fixed, and the motor driving the gear pump can adjust the speed at any time according to the instructions given by the controller, so that the fixed displacement gear pump and the drive motor form a power unit with adjustable flow. The valve core drive motor controls the displacement of the multi-way valve valve core according to the instructions of the driver's operation. Different displacements correspond to fixed flow requirements. The valve core displacement sensor feeds back the displacement signal of the valve core to the controller through the wiring harness. After the controller calculates the required flow of the multi-way valve, it controls the speed of the drive motor, so as to achieve that the pump output flow is equal to the required flow of the multi-way valve, prevent excess flow from heating up, causing energy loss, and saving energy consumption.

[0023] Furthermore, each of the multi-way multi-port valves is also provided with an LS port, and the LS port and the oil inlet P are respectively connected to the wiring harness through detection lines, and an LS port pressure sensor and a P port pressure sensor are respectively fixedly installed on the two detection lines.

[0024] The beneficial effect of adopting the above further scheme is that the displacement of the gear pump is fixed, and the motor driving the gear pump can adjust the speed at any time according to the instructions given by the controller, so that the fixed displacement gear pump and the drive motor form a power unit with adjustable flow. When the flow required by the multi-way valve is equal to the output flow of the gear pump, the difference between the pressure value collected by the pressure sensor at the P port of the multi-way valve and the pressure value collected by the pressure sensor at the LS port of the multi-way valve is a certain value ΔP. If the difference is less than ΔP, the controller will control the drive motor to increase the speed until the difference is equal to ΔP. If the difference is greater than ΔP, the controller will control the drive motor to reduce the speed, so as to achieve that the pump output flow is equal to the flow required by the multi-way valve, and prevent excess flow from heating and causing energy loss.

[0025] Furthermore, it also includes an oil tank, the oil inlet of the power unit is connected to the oil tank through a pipeline, and the other end of the oil return pipeline is connected to the oil tank.

[0026] The beneficial effects of adopting the above further solution are simple structure, reasonable design, using the oil tank to provide oil to the entire system, and being able to recover the refluxed oil, which is easy to use.

[0027] Furthermore, the power unit includes a gear pump and a drive motor, the oil outlet of the gear pump is connected to the other end of the oil inlet pipeline, and its oil inlet is connected to the oil tank through a pipeline; the driving end of the drive motor is connected to the gear pump, and the drive motor is connected to the controller through a wiring harness.

[0028] The beneficial effect of adopting the above further solution is that during use, the drive motor is used to drive the gear pump to operate, and the gear pump pumps oil into the system to ensure the normal operation of the system.

[0029] Furthermore, an oil return filter is fixedly installed on the other end of the oil return pipeline.

[0030] The beneficial effects of adopting the above further scheme are simple structure, reasonable design, using the return oil filter to filter the refluxed oil, and the filtered oil flows back into the oil tank for reuse, saving resources and reducing costs.

[0031] Furthermore, it also includes a power supply, which is connected to the controller via a cable.

[0032] The beneficial effects of adopting the above further solution are simple structure, reasonable design, and utilizing power supply to power the entire system to ensure smooth operation.

[0033] The present invention also relates to a new energy tractor, comprising the load sensing system as described above.

[0034] The beneficial effect of adopting the above further scheme is that the present invention also provides a new energy tractor with a simple structure, reasonable design, and adjustable speed of the driving motor, which ensures that the output flow of the gear pump is equal to the required flow of the multi-way valve, saves energy consumption, and greatly improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0036] Figure 2 This is a schematic structural diagram of a multi-way valve in a first embodiment of the present invention;

[0037] Figure 3 It is a schematic diagram of the overall structure of the second embodiment of the present invention;

[0038] Figure 4 Schematic diagram of the structure of a multi-way valve in a second embodiment of the present invention.

[0039] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0040] 1. Controller; 2. Power supply; 3. Drive motor; 4. Gear pump; 5. Oil tank; 6. Return oil filter; 7. Multi-way valve; 7.1. Valve core drive motor; 7.2. Valve core displacement sensor; 8. Wiring harness; 9. LS port pressure sensor; 10. Multi-way multi-port valve; 11. Oil inlet pipeline; 12. Oil return pipeline; 13. P port pressure sensor. DETAILED DESCRIPTION

[0041] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0044] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0045] Example 1

[0046] like Figures 1 to 4 As shown, this embodiment provides a load-sensitive system, including a controller 1, a multi-way valve 7, an oil inlet pipeline 11, an oil return pipeline 12 and a power unit with adjustable flow, wherein the multi-way valve 7 is provided with an oil inlet P, an oil return port T and at least one pair of interfaces A and B, wherein the oil inlet P is connected to the interface A and the oil return port T is connected to the interface B, or the oil inlet P is connected to the interface B and the oil return port T is connected to the interface A, or the oil return port T is connected to the interface A and the interface B respectively; the interface A and the interface B are used to connect the oil inlet and the oil return port of the machine respectively;

[0047] One end of the oil inlet pipeline 11 is connected to the oil inlet port P, and the other end is connected to the power unit; one end of the oil return pipeline 12 is connected to the oil return port T, and the other end is used to connect to the oil tank 5; the multi-way valve 7 and the power unit are respectively connected to the controller 1 through the wiring harness 8.

[0048] During use, the controller 1 can control the power unit to adjust the flow of the oil to ensure that the output oil flow is equal to the required flow of the multi-way valve 7, thereby saving energy consumption and greatly improving work efficiency.

[0049] It should be noted that the controller 1 and the multi-way valve 7 respectively adopt the existing technology, and their specific structures and principles are not described in detail here.

[0050] Example 2

[0051] On the basis of Example 1, in this embodiment, the multi-way valve 7 includes at least one multi-way multi-port valve 10 having the same number as the interface A and the interface B, and each of the multi-way multi-port valves 10 is provided with oil port 1, oil port 2, oil port 3 and oil port 4, the oil port 1 is connected with the oil port 3 and the oil port 2 is connected with the oil port 4, or the oil port 1 is connected with the oil port 4 and the oil port 2 is connected with the oil port 3;

[0052] The oil port 1 is connected to the oil inlet P through a pipeline, the oil port 2 is connected to the oil return port T through a pipeline, the oil port 3 is connected to the interface A through a pipeline, and the oil port 4 is connected to the interface B through a pipeline;

[0053] One end of the multi-way multi-port valve 10 is connected to the wiring harness 8 via a line, on which a valve core displacement sensor 7.2 is fixedly installed; one end of the multi-way multi-port valve 10 is installed with a driving component for driving the valve core to operate, and the driving component is connected to the wiring harness 8 via a line.

[0054] During use, the valve core displacement sensor 7.2 feeds back the displacement signal of the valve core of the multi-way multi-port valve 10 to the controller 1 via the wiring harness 8. After the controller 1 calculates the required flow of the multi-way valve 7, it controls the flow output by the power unit, so that the output flow is equal to the required flow of the multi-way valve 7, preventing excess flow from generating heat, causing energy loss, and saving energy consumption.

[0055] Example 3

[0056] On the basis of Example 2, in this embodiment, the multi-way valve 7 includes a plurality of the multi-way multi-port valves 10, the plurality of the multi-way multi-port valves 10 are arranged in parallel, and the maximum displacement values ​​of the valve cores of the plurality of the multi-way multi-port valves 10 are consistent or inconsistent.

[0057] The solution has a simple structure, and the multi-way multi-port valve 10 can be connected to multiple different machines and tools to perform different operations, making the operation more convenient.

[0058] Based on the above scheme, the number of the multi-way multi-port valves 10 is preferably three. In this case, the multi-way valve 7 is provided with three pairs of interfaces A and B, namely, interface A1 and interface B1, interface A2 and interface B2, and interface A3 and interface B3.

[0059] Example 4

[0060] On the basis of any one of Examples 2 to 3, in this embodiment, the driving member includes a gear, a rack and a valve core driving motor 7.1, the rack is inserted into one end of the multi-way multi-way valve 10, and one end thereof extends into the multi-way multi-way valve 10 and is fixedly connected to the valve core; the valve core driving motor 7.1 is fixedly arranged, and is connected to the wiring harness 8 through a line, and the gear is fixedly sleeved on the driving end of the valve core driving motor 7.1, and is meshed with the rack.

[0061] The displacement of the gear pump 4 is fixed, and the drive motor 3 can adjust the speed at any time according to the instructions given by the controller 1. In this way, the fixed-displacement gear pump and the drive motor form a power unit with adjustable flow. The valve core drive motor 7.1 controls the displacement of the multi-way valve valve core according to the instructions of the driver's operation. Different displacements correspond to fixed flow requirements. The valve core displacement sensor 7.2 feeds the displacement signal of the valve core to the controller 1 through the wiring harness 8. After the controller 1 calculates the required flow of the multi-way valve 7, it controls the speed of the drive motor 3, so as to achieve that the pump output flow is equal to the required flow of the multi-way valve 7, prevent excess flow from heating up, causing energy loss, and saving energy consumption.

[0062] Example 5

[0063] On the basis of any one of Examples 2 to 4, in this embodiment, each of the multi-way multi-port valves 10 is further provided with an LS port, and the LS port and the oil inlet P are respectively connected to the wiring harness 8 through detection lines, and the two detection lines are respectively fixedly installed with an LS port pressure sensor 9 and a P port pressure sensor 13.

[0064] The displacement of the gear pump 4 is fixed, and the drive motor 3 can adjust the speed at any time according to the instructions given by the controller 1, so that the fixed displacement gear pump and the drive motor form a power unit with adjustable flow. When the flow required by the multi-way valve is equal to the output flow of the gear pump, the difference between the pressure value collected by the pressure sensor 13 at the P port of the multi-way valve and the pressure value collected by the pressure sensor 9 at the LS port of the multi-way valve is a certain value ΔP. If the difference is less than ΔP, the controller will control the drive motor to increase the speed until the difference is equal to ΔP. If the difference is greater than ΔP, the controller will control the drive motor to reduce the speed, so as to achieve that the pump output flow is equal to the flow required by the multi-way valve, and prevent excess flow from heating up and causing energy loss.

[0065] Example 6

[0066] On the basis of the above embodiments, this embodiment further includes an oil tank 5 , the oil inlet of the power unit is connected to the oil tank 5 through a pipeline, and the other end of the oil return pipeline 12 is connected to the oil tank 5 .

[0067] This solution has a simple structure and a reasonable design. The oil tank 5 is used to provide oil to the entire system, and the refluxed oil can be recovered, so it is easy to use.

[0068] Example 7

[0069] On the basis of Example 6, in this embodiment, the power unit includes a gear pump 4 and a drive motor 3, the oil outlet of the gear pump 4 is connected to the other end of the oil inlet pipeline 11, and its oil inlet is connected to the oil tank 5 through a pipeline; the driving end of the drive motor 3 is connected to the gear pump 4, and the drive motor 3 is connected to the controller 1 through a wiring harness 8.

[0070] During use, the drive motor 3 is used to drive the gear pump 4 to operate, and the gear pump 4 pumps oil into the system to ensure the normal operation of the system.

[0071] Example 8

[0072] On the basis of the above embodiments, in this embodiment, an oil return filter 6 is fixedly installed on the other end of the oil return pipeline 12 .

[0073] The solution has a simple structure and a reasonable design. The return oil filter 6 is used to filter the refluxed oil, and the filtered oil flows back into the oil tank 5 for reuse, thereby saving resources and reducing costs.

[0074] Example 9

[0075] On the basis of the above embodiments, this embodiment further includes a power supply 2, and the power supply 2 is connected to the controller 1 through a cable.

[0076] The solution has a simple structure and a reasonable design. The power supply 2 is used to power the entire system to ensure smooth operation.

[0077] Example 10

[0078] On the basis of the above embodiments, this embodiment further provides a new energy tractor, comprising the load sensing system as described above.

[0079] This embodiment also provides a new energy tractor with a simple structure, reasonable design, and adjustable speed of the drive motor, ensuring that the output flow of the gear pump is equal to the required flow of the multi-way valve, saving energy consumption, and greatly improving work efficiency.

[0080] The working principle of the present invention is as follows:

[0081] Solution 1: The displacement of the gear pump 4 is fixed, and the drive motor 3 can adjust the speed at any time according to the instructions given by the controller 1. In this way, the fixed-displacement gear pump and the drive motor form a power unit with adjustable flow. The valve core drive motor 7.1 controls the displacement of the multi-way valve valve core according to the instructions of the driver's operation. Different displacements correspond to fixed flow requirements. The valve core displacement sensor 7.2 feeds the displacement signal of the valve core to the controller 1 through the wiring harness 8. After the controller 1 calculates the required flow of the multi-way valve 7, it controls the speed of the drive motor 3, so that the pump output flow is equal to the required flow of the multi-way valve 7, preventing excess flow from heating up and causing energy loss, thereby saving energy consumption (refer to the attached Figure 1 and Figure 2 ).

[0082] In this solution, the flow demand of the multi-way valve is converted into a valve core position signal, which is fed back to the controller 1 through the displacement sensor 7.2. The controller 1 converts this signal into a speed signal for controlling the drive motor 3 after calculation, thereby controlling the output flow of the gear pump 4.

[0083] Solution 2: The displacement of the gear pump 4 is fixed, and the drive motor 3 can adjust the speed at any time according to the instructions given by the controller 1. In this way, the fixed-displacement gear pump and the drive motor form a power unit with adjustable flow. When the flow required by the multi-way valve is equal to the output flow of the gear pump, the difference between the pressure value collected by the pressure sensor 13 at the P port of the multi-way valve and the pressure value collected by the pressure sensor 9 at the LS port of the multi-way valve is a certain value ΔP. If the difference is less than ΔP, the controller will control the drive motor to increase the speed until the difference is equal to ΔP. If the difference is greater than ΔP, the controller will control the drive motor to reduce the speed, so as to achieve that the pump output flow is equal to the flow required by the multi-way valve, and prevent excess flow from heating up and causing energy loss (refer to the attached Figure 3 and Figure 4 ).

[0084] In this scheme, according to the load-sensitive structural characteristics, that is, when the demand flow of the multi-way valve is equal to the output flow of the gear pump 4, the pressure difference between the P port and the Ls port of the multi-way valve is a constant value, so pressure sensors are installed at the P port and Ls port of the multi-way valve respectively, and the pressure signals at the two places are collected and fed back to the controller 1. The controller 1 converts this signal into a speed signal for controlling the drive motor 3 after calculation, thereby controlling the output flow of the gear pump 4.

[0085] It should be noted that all electronic components involved in the present invention adopt the existing technology, and the above-mentioned components are electrically connected to the controller, and the control circuit between the controller and each component is the existing technology.

[0086] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0087] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A load-sensing system, Features: The invention comprises a controller (1), a multi-way valve (7), an oil inlet pipeline (11), an oil return pipeline (12) and a power unit with adjustable flow rate, wherein the multi-way valve (7) is provided with an oil inlet P, an oil return port T and at least one pair of interfaces A and B, wherein the oil inlet P is in communication with the interface A and the oil return port T is in communication with the interface B, or the oil inlet P is in communication with the interface B and the oil return port T is in communication with the interface A, or the oil return port T is in communication with the interface A and the interface B respectively; the interface A and the interface B are used to connect the oil inlet and the oil return port of the machine respectively; One end of the oil inlet pipeline (11) is connected to the oil inlet port P, and the other end is connected to the power unit; one end of the oil return pipeline (12) is connected to the oil return port T, and the other end is used to connect to the oil tank (5); the multi-way valve (7) and the power unit are respectively connected to the controller (1) via a wiring harness (8); The multi-way valve (7) comprises at least one port having the same number as the port A and the port B. A multi-way multi-port valve (10), each of the multi-way multi-port valves (10) being provided with oil port one, oil port two, oil port three and oil port four, the oil port one being in communication with the oil port three and the oil port two being in communication with the oil port four, or the oil port one being in communication with the oil port four and the oil port two being in communication with the oil port three; The oil port 1 is connected to the oil inlet P through a pipeline, the oil port 2 is connected to the oil return port T through a pipeline, the oil port 3 is connected to the interface A through a pipeline, and the oil port 4 is connected to the interface B through a pipeline; One end of the multi-way multi-port valve (10) is connected to the wiring harness (8) via a line, and a valve core displacement sensor (7.2) is fixedly installed on the line; a driving component for driving the valve core to operate is installed at one end of the multi-way multi-port valve (10), and the driving component is connected to the wiring harness (8) via a line; Each of the multi-way multi-port valves (10) is also provided with an LS port, the LS port and the oil inlet port P are respectively connected to the wiring harness (8) via a detection line, and an LS port pressure sensor (9) and a P port pressure sensor (13) are respectively fixedly mounted on the two detection lines.

2. The load sensing system according to claim 1, Features: The multi-way valve (7) comprises a plurality of the multi-way multi-port valves (10), the plurality of the multi-way multi-port valves (10) are arranged in parallel, and the maximum displacement values ​​of the valve cores of the plurality of the multi-way multi-port valves (10) are consistent or inconsistent.

3. The load sensing system according to claim 1, Features: The driving member comprises a gear, a rack and a valve core driving motor (7.1); the rack is inserted into one end of the multi-way multi-port valve (10), and one end thereof extends into the multi-way multi-port valve (10) and is fixedly connected to the valve core; the valve core driving motor (7.1) is fixedly arranged and connected to the wiring harness (8) via a line; the gear is fixedly sleeved on the driving end of the valve core driving motor (7.1) and meshes with the rack.

4. The load sensing system according to any one of claims 1 to 3, Features: It also comprises an oil tank (5), the oil inlet of the power unit being in communication with the oil tank (5) via a pipeline, and the other end of the oil return pipeline (12) being in communication with the oil tank (5).

5. The load sensing system according to claim 4, Features: The power unit comprises a gear pump (4) and a drive motor (3); an oil outlet of the gear pump (4) is connected to the other end of the oil inlet pipeline (11), and an oil inlet of the gear pump (4) is connected to the oil tank (5) via a pipeline; a drive end of the drive motor (3) is connected to the gear pump (4), and the drive motor (3) is connected to the controller (1) via a wiring harness (8).

6. The load sensing system according to any one of claims 1 to 3, Features: An oil return filter (6) is fixedly mounted on the other end of the oil return pipeline (12).

7. The load sensing system according to any one of claims 1 to 3, Features: It also comprises a power supply (2), wherein the power supply (2) is connected to the controller (1) via a cable.

8. A new energy tractor, Features: Comprising a load sensing system as described in any one of claims 1-7.

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