Load feedback control loop and load sensitive quantification system

Abstract

The invention provides a load feedback control loop and a load-sensitive quantitative system. The load feedback control loop comprises an adjustable throttling valve, a first direction valve, a second throttling device, a feedback control unit and an actuator. The load feedback control loop is provided with a loop oil inlet, a loop oil return port and a feedback pressure oil output port; the first direction valve comprises a first oil inlet, a first oil return port, a first working port and a second working port; the feedback control unit comprises a logic valve, and the logic valve comprises a first input port, a second input port and a first output port; the actuator comprises a first load port and a second load port; the loop oil inlet, the adjustable throttle valve and the first oil inlet are sequentially connected in series, and the loop oil return port is communicated with the first oil return port; the first working port is communicated with the first load port, and the second working port, the second throttler and the second load port are sequentially connected in series; the first input port is communicated with the first load port, the second input port is communicated with the second load port, and the first output port is communicated with the feedback pressure oil output port.

Description

[0001] This application is a divisional application of Chinese patent application number 202110369610.9, filed on April 7, 2021, and is titled "Load Feedback Control Loop and Load-Sensitive Quantitative System." Technical Field

[0002] The present invention relates to the field of fluid transmission and control, and in particular to a load feedback control loop and a load-sensitive quantitative system. Background Art

[0003] Hydraulic transmission, with its advantages of high power density, flexible layout, easy load retention, and ability to easily achieve high-power linear reciprocating motion, has found widespread application in engineering machinery, offshore engineering, shipbuilding, mining, agricultural machinery, industry, aerospace, and other fields. Load-sensing control is a high-end control technology in hydraulic transmission. It enables on-demand rationing of circuit pressure and flow according to circuit control requirements. It also enables multi-motion, compound motion control through circuit pressure differential compensation, making it a highly efficient power source distribution control technology. The core components of this technology are load-sensing valves and load-sensing metering systems. Well-known hydraulic component manufacturers both domestically and internationally have developed a comprehensive range of load-sensing multi-way valves and load-sensing metering systems. However, load-sensing multi-way valves, due to their advanced technology and complex structure, lack of component versatility, and high cost, have become a major constraint on the widespread application of load-sensing technology. Therefore, developing a more economical load-sensing control technology to promote the widespread application of this highly efficient control technology is an urgent need. Summary of the Invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide a load feedback control loop and a load-sensitive quantitative system.

[0005] The load feedback control loop includes a first throttle, a first directional valve, a second throttle, a feedback control unit, and an actuator; the load feedback control loop has a loop oil inlet, a loop oil return port, and a feedback pressure oil output port; the first directional valve includes a first oil inlet, a first oil return port, a first working port, and a second working port; the feedback control unit includes a logic valve, and the logic valve includes a first input port, a second input port, and a first output port;

[0006] The actuator includes a first load port and a second load port; a circuit oil inlet, a first throttle and the first oil inlet are connected in series, and the circuit oil return port is connected to the first oil return port;

[0007] The first working port is connected to the first load port, and the second working port, the second throttle and the second load port are connected in series in sequence;

[0008] The first input port is communicated with the first load port, the second input port is communicated with the second load port, and the first output port is communicated with the feedback pressure oil output port.

[0009] Preferably, the feedback control unit further includes a first relief valve and a second relief valve; or, the feedback control unit includes any one of the first relief valve, the second relief valve and the third relief valve;

[0010] The first relief valve is connected to the first input port and the circuit oil return port;

[0011] The second relief valve is connected to the second input port and the circuit oil return port;

[0012] The third overflow valve is connected to the first output port and the circuit oil return port.

[0013] Preferably, the feedback control unit further comprises a fourth relief valve and a fifth relief valve;

[0014] The fourth relief valve is connected to the first input port and the circuit oil return port;

[0015] The fifth overflow valve is connected to the second input port and the circuit oil return port.

[0016] Preferably, the feedback control unit further comprises a crossover relief valve, one end of the crossover relief valve is communicated with the first input port, and the other end of the crossover relief valve is communicated with the second input port.

[0017] Preferably, the actuator further includes a third control oil port, and the feedback pressure oil output port is communicated with the third control oil port.

[0018] The present invention also provides a load-sensitive quantitative system, comprising the above-mentioned load feedback control loop, an oil source control unit and a power unit;

[0019] The oil source control unit includes a first feedback pressure input port, a pressure oil inlet port and a pressure oil outlet port;

[0020] The power unit includes a pressure oil output port and a pressure oil return port;

[0021] The pressure oil output port is connected to the pressure oil inlet and the circuit oil inlet respectively;

[0022] The pressure oil return port is connected to the pressure oil outlet and the circuit oil return port respectively;

[0023] The first feedback pressure input port is communicated with the feedback pressure oil output port.

[0024] Preferably, the oil source control unit further includes a sixth relief valve and a seventh relief valve;

[0025] The sixth relief valve is connected to the first feedback pressure input port and the pressure oil outlet;

[0026] The seventh relief valve is connected to the pressure oil inlet and the pressure oil outlet, and the seventh relief valve further includes a feedback port connected to the first feedback pressure input port.

[0027] Preferably, the oil source control unit further includes an eighth overflow valve, and the eighth overflow valve connects the pressure oil inlet and the pressure oil outlet.

[0028] Preferably, the oil source control unit further includes a second directional valve communicating with the first feedback pressure input port and the pressure oil outlet port.

[0029] Preferably, the load-sensitive quantitative system further comprises a feedback logic module and a plurality of load feedback control loops;

[0030] The feedback logic module includes a feedback oil output port and a plurality of feedback oil input ports, wherein the feedback oil input ports are connected to the feedback pressure oil output ports in a one-to-one correspondence;

[0031] The feedback oil output port is communicated with the first feedback pressure input port.

[0032] Technical effects of the present invention:

[0033] The present invention proposes a load feedback control loop and a load-sensitive quantitative system, which can realize on-demand allocation of loop pressure and flow according to the control requirements of the loop, and at the same time realize multi-action compound motion control through loop pressure difference compensation technology. In addition, the load feedback control loop has a simple structure. By setting and adjusting the opening of the first throttle and the second throttle, two different loop flow rates can be obtained, realizing asymmetric flow control of the loop. In traditional oil inlet or return oil throttling speed control loops, a large part of the pressure loss is in the throttling element, making the effective pressure difference allocated to the actuator very small, and the loop driving force is greatly reduced. The load feedback control loop provided by the present invention can be simplified to realize fixed ratio and constant speed control of the asymmetric flow control loop through the clever combination and configuration of the first throttle and the second throttle in the loop. Combined with the oil source pressure flow control based on load feedback, on-demand allocation of loop pressure and flow is realized. Under the same pressure conditions, the loop driving force is large and the system efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of the structure of a load feedback control loop according to an embodiment of the present invention;

[0035] Figure 2 for Figure 1 A schematic structural diagram of a feedback control unit in an embodiment;

[0036] Figure 3 for Figure 1 A schematic structural diagram of another embodiment of the feedback control unit;

[0037] Figure 4 A schematic structural diagram of another embodiment of a load feedback control loop according to the present invention;

[0038] Figure 5 for Figure 4 A schematic structural diagram of a feedback control unit in an embodiment;

[0039] Figure 6 for Figure 4 A schematic structural diagram of another embodiment of the feedback control unit;

[0040] Figure 7 for Figure 4 A schematic structural diagram of another embodiment of the feedback control unit;

[0041] Figure 8 for Figure 4 A schematic structural diagram of another embodiment of the feedback control unit;

[0042] Figure 9 A schematic structural diagram of another embodiment of a load feedback control loop according to the present invention;

[0043] Figure 10 It is a structural diagram of another embodiment of the load feedback control loop of the present invention;

[0044] Figure 11 This is a schematic structural diagram of an embodiment of a load-sensitive quantitative system of the present invention;

[0045] Figure 12 for Figure 11 A schematic structural diagram of another embodiment of the oil source control unit;

[0046] Figure 13 for Figure 11 A schematic structural diagram of the oil source control unit in the embodiment;

[0047] Figure 14 FIG. 4 is a schematic structural diagram of another embodiment of the load-sensitive quantitative system of the present invention. DETAILED DESCRIPTION

[0048] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several variations and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0049] Example 1:

[0050] Reference Figures 1 to 3The present invention proposes a load feedback control loop, comprising a first throttle 11, a first directional valve 12, a second throttle 13, a feedback control unit 14 and an actuator 15; the load feedback control loop has a loop oil inlet P1, a loop oil return port T1 and a feedback pressure oil output port LS1; the first directional valve includes a first oil inlet P12.3, a first oil return port P12.1, a first working port P12.2 and a second working port P12.4; the feedback control unit includes a logic valve 141, the logic valve includes a first input port P141.1, a second input port P141.2 and a first output port P141.3; the actuator includes a first load port A1 and a second load port B1; the circuit oil inlet P1, the first throttle 11 and the first oil inlet P12.3 are connected in series in sequence, and the circuit oil return port T1 is connected to the first oil return port P12.1; the first working port P12.2 is connected to the first load port A1, and the second working port P12.4, the second throttle 13 and the second load port B1 are connected in series in sequence; the first input port P141.1 is connected to the first load port A1, the second input port P141.2 is connected to the second load port B1, and the first output port P141.3 is connected to the feedback pressure oil output port LS1.

[0051] Feedback control unit 14 includes three oil ports: P14.1, P14.2, and P14.3. P14.1 communicates with the first load port A1, P14.2 communicates with the second load port B1, and P14.3 communicates with the feedback pressure output port LS1. Feedback control unit 14 includes a logic valve 141. First input port P141.1 communicates with P14.1, second input port P141.2 communicates with P14.2, and first output port P141.3 communicates with P14.3. The term "connected" in this disclosure refers to directly connecting the two oil ports via a pipeline.

[0052] The oil flow in this embodiment is as follows: When the first directional valve 12 is in the left position, the pressurized oil flows in from the circuit oil inlet P1, passes through the first throttle 11 and the first directional valve 12, and then flows from the second working port P12.4 of the first directional valve 12 to the second throttle 13. After passing through the second throttle 13, it reaches the second load port B1. At the same time, the pressure of the second load port B1 is also connected to the oil port P14.2 of the feedback control unit 14. The return oil of the actuator passes through the first load port A1 and reaches the first working port P12.2. After passing through the first directional valve 12, it returns to the circuit from the first return oil port P12.1. At port T1, the pressure at the first load port A1 is transmitted to port P14.1 of the feedback control unit 14. Subsequently, the pressure oil at ports P14.1 and P14.2 of the feedback control unit 14 reaches the first input port P141.1 and the second input port P141.2 of the logic valve 141, respectively. Since the pressure at port P14.2 is higher than the pressure at port P14.1, the logic valve 141 compares the two pressures and outputs the higher pressure oil at port P14.2 through the first output port P141.3 to port P14.3 of the feedback control unit 14, and then reaches the loop feedback pressure output port LS1. Thus, in this state, the feedback pressure is derived from the load pressure after passing through the first throttle 11 and the second throttle 13.

[0053] When the first directional valve 12 is in the right position, the pressure oil flows in from the circuit oil inlet P1, passes through the first throttle 11 and the first directional valve 12, and then flows from the first working port P12.2 of the first directional valve 12 through the second throttle 13 to the first load port A1 of the actuator. At the same time, the pressure of the first load port A1 is also connected to the oil port P14.1 of the feedback control unit 14. The return oil of the actuator reaches the first working port P12.2 of the first directional valve 12 through the second load port B1, and then returns to the circuit oil return port T1 from the first return oil port P12.1 after passing through the first directional valve 12. The pressure at the second load port B1 is also connected to port P14.2 of the feedback control unit 14. Subsequently, the pressure oil at ports P14.1 and P14.2 of the feedback control unit 14 reaches the first input port P141.1 and the second input port P141.2 of the logic valve 141, respectively. Since the pressure at port P14.1 is higher than the pressure at port P14.2, the logic valve 141 compares the two pressures and outputs the higher pressure oil at port P14.1 through port P141.3 to port P14.3 of the feedback control unit 14, where it then reaches the loop feedback pressure output port LS1. This shows that in this state, the feedback pressure is derived from the load pressure after it passes through the first throttle 11.

[0054] In this embodiment, the first throttle 11 can be any of a fixed orifice, an adjustable throttle valve, and an adjustable throttle valve with compensation. The second throttle 13 can be any of a fixed orifice, a one-way throttle valve, an adjustable throttle valve, a one-way adjustable throttle valve, an adjustable throttle valve with compensation, and an adjustable one-way throttle valve with compensation. The logic valve 141 in the feedback control unit 14 can be a single-spool shuttle valve, a dual-spool shuttle valve, or an integrated valve consisting of two one-way valves.

[0055] The beneficial effects achieved by the load feedback control loop are as follows: by setting or adjusting the opening of the first throttle 11, the flow rate of P1-A1 can be adjusted to meet the speed control requirements of the first load port A1, and then by setting or adjusting the opening of the second throttle 13, the flow rate of P1-B1 can be adjusted to meet the speed control requirements of the load at the first load port A1. Since the flow rate of P-A1 is determined by the opening of the first throttle 11 and the system pressure difference, and the flow rate of P-B1 is determined by the series opening of the first throttle 11 and the second throttle 13 and the system pressure difference, the flow rate of P-B1 is less than or equal to the flow rate of P-A1. It can be seen that the load feedback control loop can obtain two different loop flow rates by setting and adjusting the openings of the first throttle 11 and the second throttle 13, thereby realizing asymmetric flow control of the loop. When the first throttle 11 and the second throttle 13 are instantiated as fixed damping holes, the load feedback control loop achieves the purpose of an asymmetric flow control loop in the load feedback control system by using two fixed damping elements instead of two throttling elements, simplifies the loop control elements, reduces manufacturing costs, and has important practical value.

[0056] Example 2:

[0057] Reference Figure 3 and Figure 7 The feedback control unit 14 also includes a crossover relief valve 142, one end P142.1 of which is connected to the first input port P141.1, and the other end P142.2 of which is connected to the second input port P141.2. In this embodiment, the crossover relief valve 142 comprises two reverse-parallel relief valves, with the input port of one relief valve connected end-to-end with the output port of the other relief valve. The two relief valves share a pressure regulating device, and the two ports of the crossover relief valve, which serve as input and output ports, have equal effective areas on the valve core. The provision of the crossover relief valve 142 in the feedback control unit 14 achieves the following advantages: by adjusting the relief pressure of the crossover relief valve 142, a single element is used to control the same maximum operating pressure requirement for two load oil ports A1 and B1 in the control loop. This reduces control components, simplifies circuit control, and reduces circuit control costs. This has important application value in symmetrical flow loops where both oil ports have the same pressure limit requirement.

[0058] Example 3:

[0059] Reference Figures 4 to 6 , the feedback control unit includes any one of the first relief valve 143 , the second relief valve 144 and the third relief valve 145 , or the feedback control unit includes the first relief valve 143 and the second relief valve 144 ;

[0060] Specifically, the first relief valve 143 connects the first input port P141.1 with the oil return port T1, the second relief valve 144 connects the second input port P141.2 with the oil return port T1, and the third relief valve 145 connects the first output port P141.3 with the oil return port T1.

[0061] This section describes four solutions: Solution 1, the feedback control unit includes only the first relief valve 143; Solution 2, the feedback control unit includes only the second relief valve 144; Solution 3, the feedback control unit includes only the third relief valve 145; Solution 4, the feedback control unit includes both the first relief valve 143 and the second relief valve 144. Figure 5 Corresponding to Option 4, the other three options can also be referred to Figure 5 and Figure 6 .

[0062] Example 4:

[0063] Reference Figure 7 The feedback control unit also includes a fourth overflow valve 146 and / or a fifth overflow valve 147; the fourth overflow valve 146 connects the first input port P141.1 and the circuit oil return port T1; the fifth overflow valve 147 connects the second input port P141.2 and the circuit oil return port T1.

[0064] Reference Figure 8 The first relief valve 143 , the second relief valve 144 , the third relief valve 145 , the fourth relief valve 146 and the fifth relief valve 147 coexist to form a redundant solution.

[0065] The beneficial effects obtained by each overflow valve configured by the feedback control unit 14 are:

[0066] The first relief valve 143 limits the feedback pressure of the first load port A1, the second relief valve 144 limits the feedback pressure of the second load port B1, and the third relief valve 145 limits the feedback pressure of the first load port A1 and the second load port B1 in the same way. This achieves the use of small-flow relief valves to limit the feedback pressure, and then uses the oil source module to limit the pressure of the loop load port.

[0067] The fourth relief valve 146 directly limits the pressure at the first load port A1; the fifth relief valve 147 directly limits the pressure at the second load port B1. When the fourth relief valve 146 is a charge relief valve, when the first load port A1 has a tendency to absorb cavitation under the action of a negative load, the charge check valve of the fourth relief valve 146 opens, and oil flows from the oil port 14.4 through the fourth relief valve 146 to the first load port A1, thereby replenishing the first load port A1 and preventing damage to system components caused by cavitation. When the fifth relief valve 147 is a charge relief valve, when the second load port B1 has a tendency to absorb cavitation under the action of a negative load, the charge check valve of the fifth relief valve 147 opens, and oil flows from the oil port 14.4 through the fourth relief valve 146 to the second load port B1, thereby replenishing the second load port B1 and preventing damage to system components caused by cavitation.

[0068] Example 5:

[0069] Reference Figure 9 and Figure 10 The actuator also has a third control oil port Pi1, which is connected to the oil port P14.3 of the feedback control unit; the actual typical application scenarios are: in the slewing drive circuit of pump trucks, cranes and other slewing bearing equipment, when the slewing action is performed, a pressure signal related to the driving pressure is required to open the brake on the slewing motor or the slewing reducer; in the circuit control of hydraulic winches, crane winches, etc., a pressure signal related to the driving pressure is also required when the actuator is in action to open the brake on the slewing motor or the slewing reducer; in the two-speed switching travel motor control circuit related to belt pressure, a pressure signal related to dynamic pressure is also required to control the automatic two-speed switching of the motor.

[0070] Example 6:

[0071] Reference Figure 11 The present invention also proposes a load-sensitive quantitative system, comprising the above-mentioned load feedback control loop, an oil source control unit SC and a power unit PU; the oil source control unit SC comprises a first feedback pressure input port LS0, a pressure oil inlet P0 and a pressure oil outlet T0; the power unit PU comprises a pressure oil output port P and a pressure oil return port T; the pressure oil output port P is respectively connected to the pressure oil inlet P0 and the circuit oil inlet P1; the pressure oil return port T is respectively connected to the pressure oil outlet T0 and the circuit oil return port T1; the first feedback pressure input port LS0 is connected to the feedback pressure oil output port LS1.

[0072] Example 7:

[0073] Reference Figures 11 to 13The oil source control unit SC also includes a sixth relief valve SC1 and a seventh relief valve SC2. The sixth relief valve SC1 connects the first feedback pressure input port LS0 to the pressure oil outlet T0. The seventh relief valve SC2 connects the pressure oil inlet P0 to the pressure oil outlet T0 and includes a feedback port connected to the first feedback pressure input port LS0. The oil source control unit SC also includes an eighth relief valve SC1. The eighth relief valve SC3 connects the pressure oil inlet P0 to the pressure oil outlet T0. The oil source control unit SC also includes a second directional valve SC4 connecting the first feedback pressure input port LS0 to the pressure oil outlet T0.

[0074] The oil source control unit SC is equipped with a relief valve SC1 to regulate and limit the maximum value of the feedback pressure. At the same time, the feedback pressure limited by the sixth relief valve SC1 is transmitted to the feedback port PSC2.3 of the seventh relief valve SC2 (on the internal valve core of the seventh relief valve SC2, the effective area of the pressure at port PSC2.1 is equal to the effective area of the pressure at port PSC2.3). This limits the pressure at port SC2 to a value that is one spring pressure higher than the pressure at port PSC2.3 (i.e., the opening pressure of the seventh relief valve SC2 under the action of the pressure at port PSC2.1 when the feedback value of PSC2.3 is 0), thereby achieving on-demand rationing of system pressure.

[0075] The oil source control unit SC is equipped with an eighth relief valve SC3, which directly limits the pressure of the P0 port and provides full-weight pressure protection for the system; the oil source control unit SC is equipped with a second directional valve SC4, which realizes the on-off control of the feedback chamber to the 0 pressure chamber (usually the oil tank), controls the pressure buildup and pressure relief of the system, and can be used for system action enable control.

[0076] Example 8:

[0077] Reference Figure 14 The load-sensing quantitative system also includes a feedback logic module LFLB and multiple load feedback control loops. The feedback logic module LFLB includes a feedback oil output port LF and multiple feedback oil input ports LI1. The feedback oil input ports LI1 are connected to the feedback pressure oil output ports LS1 in a one-to-one correspondence. The feedback oil output ports LF are connected to the first feedback pressure input port LS0. The feedback oil pressure output from the feedback oil output ports LF is equal to the highest oil pressure among the feedback oil input ports.

[0078] The load-sensitive quantitative system adopts system pressure control based on load feedback to achieve on-demand distribution of system pressure. Excess flow overflows from the three-way overflow valve at the load pressure, which is more efficient and energy-saving than the traditional overflow system.

[0079] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations 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 should not be understood as limiting the present invention.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0081] In the present invention, unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like 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 an indirect connection through an intermediate medium, or it can be the internal communication of two components.

[0082] The above is a further detailed description of the present invention in conjunction with specific embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention.

Claims

1. A load feedback control loop, characterized in that: It includes an adjustable flow valve, a first directional valve, a second throttle, a feedback control unit and an actuator; The load feedback control loop has a loop oil inlet, a loop oil return port and a feedback pressure oil output port; The first directional valve includes a first oil inlet, a first oil return port, a first working port and a second working port; The feedback control unit includes a logic valve, wherein the logic valve includes a first input port, a second input port, and a first output port; The actuator includes a first load port and a second load port; The circuit oil inlet, the adjustable flow valve and the first oil inlet are connected in series in sequence, and the circuit oil return port is connected to the first oil return port; The first working port is connected to the first load port, and the second working port, the second throttle and the second load port are connected in series in sequence; The first input port is communicated with the first load port, the second input port is communicated with the second load port, and the first output port is communicated with the feedback pressure oil output port.

2. The load feedback control loop according to claim 1, characterized in that: The feedback control unit further includes a first relief valve and a second relief valve; or the feedback control unit includes any one of the first relief valve, the second relief valve and the third relief valve; The first relief valve is connected to the first input port and the circuit oil return port; The second relief valve is connected to the second input port and the circuit oil return port; The third overflow valve is connected to the first output port and the circuit oil return port.

3. The load feedback control loop according to claim 1, characterized in that: The feedback control unit further includes a fourth relief valve and a fifth relief valve; The fourth relief valve is connected to the first input port and the circuit oil return port; The fifth overflow valve is connected to the second input port and the circuit oil return port.

4. The load feedback control loop according to claim 1, wherein: The feedback control unit further includes a crossover relief valve, one end of which is communicated with the first input port, and the other end of which is communicated with the second input port.

5. The load feedback control loop according to claim 1, characterized in that: The actuator further includes a third control oil port, and the feedback pressure oil output port is communicated with the third control oil port.

6. A load-sensitive quantitative system, characterized in that: comprising a load feedback control loop, an oil source control unit, and a power unit according to any one of claims 1 to 5; The oil source control unit includes a first feedback pressure input port, a pressure oil inlet port and a pressure oil outlet port; The power unit includes a pressure oil output port and a pressure oil return port; The pressure oil output port is connected to the pressure oil inlet and the circuit oil inlet respectively; The pressure oil return port is connected to the pressure oil outlet and the circuit oil return port respectively; The first feedback pressure input port is communicated with the feedback pressure oil output port.

7. The load-sensitive quantitative system according to claim 6, characterized in that: The oil source control unit further includes a sixth relief valve and a seventh relief valve; The sixth relief valve is connected to the first feedback pressure input port and the pressure oil outlet; The seventh relief valve is connected to the pressure oil inlet and the pressure oil outlet, and the seventh relief valve further includes a feedback port connected to the first feedback pressure input port.

8. The load-sensitive quantitative system according to claim 7, characterized in that: The oil source control unit further includes an eighth relief valve, and the eighth relief valve connects the pressure oil inlet and the pressure oil outlet.

9. The load-sensitive quantitative system according to claim 8, characterized in that: The oil source control unit further includes a second directional valve communicating with the first feedback pressure input port and the pressure oil outlet port.

10. The load-sensitive quantitative system according to claim 6, characterized in that: The load-sensitive quantitative system further includes a feedback logic module and a plurality of load feedback control loops; The feedback logic module includes a feedback oil output port and a plurality of feedback oil input ports, wherein the feedback oil input ports are connected to the feedback pressure oil output ports in a one-to-one correspondence; The feedback oil output port is communicated with the first feedback pressure input port.

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