CN212225676U - Flow regeneration characteristic test system - Google Patents
Flow regeneration characteristic test system Download PDFInfo
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- CN212225676U CN212225676U CN202020066397.5U CN202020066397U CN212225676U CN 212225676 U CN212225676 U CN 212225676U CN 202020066397 U CN202020066397 U CN 202020066397U CN 212225676 U CN212225676 U CN 212225676U
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Abstract
The utility model relates to a hydraulic drive technical field discloses a flow regeneration characteristic test system, has solved among the prior art to the problem with high costs, test time is long among the flow regeneration characteristic test mode. The system comprises: the flow control device comprises a control device, a processing device and a to-be-detected flow regeneration valve with a plurality of working oil ports, wherein the control device is connected with the working oil ports of the to-be-detected flow regeneration valve, the processing device is connected with a specified working oil port and an oil inlet, and the control device is used for acquiring a plurality of target pressure values and correspondingly controlling the input pressure of the working oil ports; detecting whether the target pressure values are consistent with the feedback pressure values; the processing device is used for acquiring a first flow flowing out of the designated working oil port and a second flow flowing in from the oil inlet when the plurality of target pressure values and the plurality of feedback pressure values are detected to be consistent; the difference between the first flow rate and the second flow rate is determined as a regeneration flow rate. The embodiment of the utility model provides a regeneration flow is confirmed suitable for flow regeneration valve.
Description
Technical Field
The utility model relates to a hydraulic transmission technical field specifically, relates to a flow regeneration characteristic test system.
Background
The flow regeneration means that when the movement direction of the actuating element is the same as the load force direction (namely, negative load), the oil is conveyed from the high-pressure cavity to the low-pressure cavity by using the pressure generated by the load, so that the flow of the main pump required by the system is minimum or zero. The flow regeneration characteristic test is an effective method for checking the flow regeneration oil supply rate, and the current flow regeneration characteristic test method has two modes, one mode is to carry out the flow regeneration characteristic test of the hydraulic valve on a real vehicle, and the other mode is to design a special test platform for an oil cylinder loading mode, but the essence of the two modes is to adopt the oil cylinder loading mode.
However, for the oil cylinder loading test mode in the prior art, different main engine oil cylinders are variable, different oil cylinders need to be replaced in the test process, and each set of oil cylinder needs to be provided with a corresponding installation tool, so that the cost is high and the test time is long.
SUMMERY OF THE UTILITY MODEL
The utility model provides an aim at provides a flow regeneration characteristic test system, solved among the prior art to the flow regeneration characteristic test mode with high costs, the long problem of test time, this application is through providing a plurality of target pressure values, simulate different host computer hydro-cylinder to when detecting a plurality of target pressure values and a plurality of feedback pressure values of a plurality of work hydraulic fluid ports of the flow regeneration valve that awaits measuring that corresponds, with the difference between the first flow that appointed work hydraulic fluid port flows and the second flow that the oil inlet flowed in, confirm to the regeneration flow that the target pressure value of flow regeneration valve that awaits measuring corresponds has realized the simple switching of multiple host computer hydro-cylinder operating mode, save time and cost.
In order to achieve the above object, an embodiment of the present invention provides a flow regeneration characteristic testing system, including: the flow rate control device comprises a control device, a processing device and a to-be-detected flow rate regeneration valve with a plurality of working oil ports, wherein the control device is respectively connected with the working oil ports of the to-be-detected flow rate regeneration valve, the processing device is respectively connected with a specified working oil port and an oil inlet in the working oil ports of the to-be-detected flow rate regeneration valve, the control device is used for acquiring a plurality of target pressure values from the processing device and respectively and correspondingly controlling the input pressure of the working oil ports of the to-be-detected flow rate regeneration valve, and the target pressure values are the target input pressure values of the to-be-detected flow rate regeneration valve corresponding to the working oil ports; detecting whether the target pressure values are consistent with feedback pressure values of working oil ports of the flow regeneration valve to be detected in real time; the processing device is used for providing a plurality of target pressure values for the control device, and acquiring a first flow flowing out of a designated working oil port of the working oil ports and a second flow flowing in from an oil inlet of the flow regeneration valve to be detected when the plurality of target pressure values are detected to be consistent with the plurality of corresponding feedback pressure values; and determining the difference value between the first flow and the second flow as the regeneration flow corresponding to the target pressure value of the flow regeneration valve to be tested.
Further, the control device includes: the pressure sensor is respectively connected with a plurality of working oil ports of the flow regeneration valve to be detected, the pressure regulating unit is respectively connected with a plurality of working oil ports of the flow regeneration valve to be detected, the comparing unit is respectively connected with the pressure sensor, the pressure regulating unit and the processing device, and the pressure sensor is used for detecting and feeding back a plurality of feedback pressure values of the working oil ports of the flow regeneration valve to be detected; the pressure regulating unit is used for controlling a plurality of input pressures provided for a plurality of working oil ports of the flow regeneration valve to be tested; the comparison unit is used for acquiring the plurality of target pressure values and the plurality of corresponding feedback pressure values, and determining a plurality of difference values between the plurality of target pressure values and the plurality of corresponding feedback pressure values; judging whether the difference values are all zero or not; when the difference values are judged to be zero, determining that the target pressure values are consistent with the corresponding feedback pressure values; and when any one of the difference values is judged not to be zero, respectively and correspondingly controlling the input pressures of the working oil ports according to the difference values until the difference values are all zero.
Further, the pressure regulating unit comprises a pressure booster or a constant voltage source.
Further, the constant voltage source comprises a hydraulic pump and an electric modulation overflow valve, the hydraulic pump is respectively connected with the electric modulation overflow valve and a working oil port of the flow regeneration valve to be tested, and the electric modulation overflow valve is connected with the comparison unit.
Further, when the pressure regulating unit connected with the specified working oil port of the flow regeneration valve to be measured comprises a hydraulic pump and an electric modulation overflow valve, the hydraulic pump is connected with the electric modulation overflow valve through a one-way valve.
Further, the comparison unit includes a subtractor.
Further, the processing device comprises: the flow sensor is respectively connected with a designated working oil port and an oil inlet in a plurality of working oil ports of the flow regeneration valve to be detected, the processing unit is respectively connected with the flow sensor and the comparison unit, and the flow sensor is used for detecting a first flow flowing out of the designated working oil port of the flow regeneration valve to be detected and detecting a second flow flowing in of the oil inlet of the flow regeneration valve to be detected; the processing unit is configured to obtain the first flow rate and the second flow rate measured by the flow sensor when it is detected that the plurality of target pressure values are consistent with the plurality of corresponding feedback pressure values; and determining the difference value between the first flow and the second flow as the regeneration flow corresponding to the target pressure value of the flow regeneration valve to be tested.
Further, the control device further comprises a PID regulator connected between the comparing unit and the processing unit for correcting the plurality of target pressure values provided by the processing unit to the comparing unit.
Further, the processing device is further configured to obtain a regeneration flow curve corresponding to different target pressure values according to the determined regeneration flow.
Hydro-cylinder load test mode among the prior art, it is changeable because of different host computer hydro-cylinders, need change different hydro-cylinders among the experimentation, lead to with high costs, test duration is long, and the utility model discloses a plurality of working hydraulic fluid ports to the flow regeneration valve that awaits measuring provide a plurality of target pressure values, simulate different host computer hydro-cylinders to when detecting a plurality of target pressure values and a plurality of feedback pressure values of a plurality of working hydraulic fluid ports of the flow regeneration valve that awaits measuring that corresponds, with the difference between the first flow that appointed working hydraulic fluid port flows and the second flow that the oil inlet flowed in, confirm to the regeneration flow that the target pressure value of flow regeneration valve that awaits measuring corresponds has realized the simple switching of multiple host computer hydro-cylinder operating mode, save time and cost.
Other features and advantages of the present invention will be described in detail in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a simplified schematic diagram of a flow regeneration characteristic test;
fig. 2 is a schematic structural diagram of a flow regeneration characteristic testing system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another flow regeneration characteristic testing system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another flow regeneration characteristic testing system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of yet another flow regeneration characteristic testing system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of yet another flow regeneration characteristic testing system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a flow rate regeneration characteristic test system according to an embodiment of the present invention.
Description of the reference numerals
21- -control device 22- -treatment device
32, 321, 322-pressure regulating unit 3, 23-flow regeneration valve to be tested
5- -Loading cylinders C1, C2, C3, C4, C5- -orifices
1,321 a, 322 a-hydraulic pumps 321b, 322 b-electric modulated relief valves
233- -second working oil port 232- -oil inlet
234- outlet port 31, 311, 312-pressure sensor
41, 411, 412-flow sensor 610-first hydraulic pump
33- -comparison Unit 42- -processing Unit
710-oil tank 51-PID regulator
Detailed Description
The following describes in detail embodiments of the present invention with reference to the accompanying drawings. It is to be understood that the description herein is only intended to illustrate and explain embodiments of the present invention, and is not intended to limit embodiments of the present invention.
Fig. 1 is a simplified schematic diagram of a flow rate regeneration characteristic test. As shown in fig. 1, the flow rate q of the hydraulic pump 1 isp1All flows into the flow regeneration chamber, i.e. the rod chamber of the charging cylinder 5, and then from the other chamber of the charging cylinder 5, i.e. of the charging cylinder 5Rodless chamber, outflow qbThe fluid flows through a regeneration one-way valve in the flow regeneration valve 3 and then is divided into two paths, one path flows into a rod cavity of the loading oil cylinder 5 through throttling ports C5 and C2, namely, regeneration flow is formed, and the other path flows back to an oil tank through a throttling port C4. Suppose that the flow rate back to the tank is qtThe flow rate of the exhaust gas flowing out through the throttle C2 in the flow rate regeneration valve is qaThen, the flow rates satisfy the following formula (1).
qa＝qp1+(qb-qt) Formula (1)
As can be seen from the above equation (1) and FIG. 1, the regeneration flow is the flow from the rodless chamber minus the flow back to the tank, i.e., qb-qtAlso equal to the flow into the rod chamber minus the flow output by the hydraulic pump 1, i.e. qa-qp1。
Through above-mentioned flow regeneration characteristic principle, there are two kinds of flow regeneration characteristic tests among the prior art, including the hydrovalve flow regeneration characteristic test that develops on the real vehicle and the special test platform of design hydro-cylinder loading mode, above-mentioned the two all belong to hydro-cylinder loading mode, because different host computer hydro-cylinders are changeable, consequently need change different hydro-cylinders in the experimentation, and every set of hydro-cylinder all need dispose corresponding installation frock, and is with high costs, test duration is long. The utility model discloses a plurality of working hydraulic fluid ports to the flow regeneration valve that awaits measuring provide a plurality of target pressure values, simulate different main engine oil cylinders, and practical application is pressed close to more to experimental operating mode, and the commonality is stronger, need not to change the hydro-cylinder moreover, has realized the simple switching of different operating modes, has practiced thrift time and cost. The embodiments of the present invention will be described in detail below.
Fig. 2 is a schematic structural diagram of a flow regeneration characteristic testing system according to an embodiment of the present invention. As shown in fig. 2, the flow rate regeneration characteristic test system includes: the flow control device comprises a control device 21, a processing device 22 and a to-be-detected flow regeneration valve 23 with a plurality of working oil ports, wherein the control device is respectively connected with the plurality of working oil ports of the to-be-detected flow regeneration valve, the processing device is respectively connected with a designated working oil port 231 and an oil inlet 232 of the plurality of working oil ports of the to-be-detected flow regeneration valve, the control device is used for acquiring a plurality of target pressure values from the processing device and respectively and correspondingly controlling the input pressure of the plurality of working oil ports of the to-be-detected flow regeneration valve, and the plurality of target pressure values are target input pressure values of the plurality of working oil ports of the to-be-detected flow regeneration valve; detecting whether the target pressure values are consistent with feedback pressure values of working oil ports of the flow regeneration valve to be detected in real time; the processing device is used for providing a plurality of target pressure values for the control device, and acquiring a first flow flowing out of a designated working oil port of the working oil ports and a second flow flowing in from an oil inlet of the flow regeneration valve to be detected when the plurality of target pressure values are detected to be consistent with the plurality of corresponding feedback pressure values; and determining the difference value between the first flow and the second flow as the regeneration flow corresponding to the target pressure value of the flow regeneration valve to be tested.
Through above-mentioned flow regeneration characteristic test system, can realize under the real vehicle operating mode, the regeneration flow characteristic test under the different loading hydro-cylinder operating modes, through the simple replacement to a plurality of target pressure values of controlling means, can realize the regeneration flow characteristic test to different host computer hydro-cylinder products, save time and cost.
As shown in fig. 3, the control device 21 includes: the pressure sensor is connected with a plurality of working oil ports of the flow regeneration valve to be detected respectively, the pressure regulating unit is connected with a plurality of working oil ports of the flow regeneration valve to be detected respectively, the comparing unit is connected with the pressure sensor, the pressure regulating unit and the processing device respectively, and the pressure sensor is used for detecting and feeding back a plurality of feedback pressure values of the working oil ports of the flow regeneration valve to be detected; the pressure regulating unit is used for controlling a plurality of input pressures provided for a plurality of working oil ports of the flow regeneration valve to be tested; the comparison unit is used for acquiring the plurality of target pressure values and the plurality of corresponding feedback pressure values, and determining a plurality of difference values between the plurality of target pressure values and the plurality of corresponding feedback pressure values; judging whether the difference values are all zero or not; when the difference values are judged to be zero, determining that the target pressure values are consistent with the corresponding feedback pressure values; and when any one of the difference values is judged not to be zero, respectively and correspondingly controlling the input pressures of the working oil ports according to the difference values until the difference values are all zero.
The pressure regulating unit may include a pressure booster or a constant voltage source. In addition, the constant-voltage source comprises a hydraulic pump and an electric modulation overflow valve, the hydraulic pump is respectively connected with the electric modulation overflow valve and a working oil port of the flow regeneration valve to be tested, and the electric modulation overflow valve is connected with the comparison unit.
In addition, when the pressure regulating unit connected with the specified working oil port of the flow regeneration valve to be tested comprises a hydraulic pump and an electric modulation overflow valve, the hydraulic pump is connected with the electric modulation overflow valve through a one-way valve.
In addition, the comparing unit includes a subtractor.
Further, as shown in fig. 4, the processing apparatus includes: the flow sensor 41 is connected to a designated working oil port and an oil inlet of the multiple working oil ports of the flow regeneration valve to be detected, the processing unit is connected to the flow sensor and the comparing unit, and the flow sensor is used for detecting a first flow flowing out of the designated working oil port of the flow regeneration valve to be detected and detecting a second flow flowing in of the oil inlet of the flow regeneration valve to be detected; the processing unit is configured to obtain the first flow rate and the second flow rate measured by the flow sensor when it is detected that the plurality of target pressure values are consistent with the plurality of corresponding feedback pressure values; and determining the difference value between the first flow and the second flow as the regeneration flow corresponding to the target pressure value of the flow regeneration valve to be tested.
In addition, in order to achieve better control effect and make the plurality of target pressure values provided by the processing device more accurate, as shown in fig. 5, the control device further comprises a PID regulator 51 connected between the comparing unit and the processing unit for correcting the plurality of target pressure values provided by the processing unit to the comparing unit.
To facilitate understanding of the embodiment of the present invention, fig. 6 provides a schematic structural diagram of a flow regeneration characteristic testing system, taking the example that the flow regeneration valve to be tested has two working oil ports, as shown in fig. 6, which includes two pressure sensors 311 and 312, two pressure regulating units 321 and 322, a comparing unit 33, two flow sensors 411 and 412, a processing unit 42, and a PID regulator 51. The first target pressure value and the second target pressure value provided by the processing unit 42 are provided to the comparing unit 33 after being corrected by the PID controller 51, the comparing unit obtains the first target pressure value and the second target pressure value, and then the two pressure regulating units 321 and 322, the first hydraulic pump 610 and the flow regeneration valve 23 to be measured are started. The two pressure sensors 311 and 312 feed back the detected first feedback pressure value of the designated working oil port 231 of the flow regeneration valve to be detected and the detected second feedback pressure value of the second working oil port 233 to the comparison unit. And then, the comparison unit respectively controls the input pressures provided by the two pressure regulating units correspondingly according to a first difference value determined by the first target pressure value and the acquired first feedback pressure value and a second difference value determined by the second target pressure value and the acquired second feedback pressure value until the first difference value and the second difference value are both zero. That is, the comparing unit performs subtraction with the first and second target pressure values using the first and second feedback pressure values obtained from the two pressure sensors, respectively, and controls the two pressure adjusting units according to the operation result. And when the first difference value and/or the second difference value are/is not zero, continuously outputting control signals to the two pressure regulating units to control the input pressure provided by the two pressure regulating units. And when the first difference value and the second difference value are both zero, the comparison unit does not output a control signal to the voltage regulating unit any more. Meanwhile, the processing unit acquires the first difference value and the second difference value determined by the comparison unit in real time and judges whether the first difference value and the second difference value are zero or not. When the processing unit detects that the first difference and the second difference are both zero, a first flow rate flowing out from an assigned working oil port of the flow regeneration valve to be measured and a second flow rate flowing into an oil inlet of the flow regeneration valve to be measured from a first hydraulic pump are respectively obtained through the two flow sensors 411 and 412. And determining the difference between the first flow and the second flow as the regeneration flow corresponding to the first target pressure value and the second target pressure value, namely obtaining the regeneration flow corresponding to the current first target pressure value and the current second target pressure value. Corresponding regeneration flow can be obtained by inputting different first target pressure values and second target pressure values, so that the processing device can obtain regeneration flow curves corresponding to different target pressure values according to the determined regeneration flow.
Wherein, the embodiment of the utility model provides an in with the loading cylinder cancellation of the work hydraulic fluid port of the flow regeneration valve among the prior art to set up the pressure regulating unit that can independently adjust pressure on the work hydraulic fluid port, and correspond only to provide input pressure and not provide the flow to the appointed work hydraulic fluid port of flow regeneration valve, and to other work hydraulic fluid ports of the flow regeneration valve that awaits measuring provide input pressure and input flow, thereby loading cylinder have pole chamber pressure and no pole chamber pressure when above-mentioned pressure regulating unit can simulate real car operating mode in real time.
The first hydraulic pump is used for providing pressure and flow required by normal work for the pressure regulating unit.
The method comprises the steps that a processing device inputs actual vehicle working condition load spectrum signals, namely a first target pressure value and a second target pressure value, to a comparison unit in a control device, so that the pressure of a rod cavity and the pressure of a rodless cavity of a loading oil cylinder are simulated, the comparison unit provides the first target pressure value and the second target pressure value to a pressure regulating unit, and the pressure regulating unit controls the input pressure provided to a flow regeneration valve to be tested.
For example, the two pressure regulating units each include a constant-voltage source, and the two constant-voltage sources include a hydraulic pump and an electrical modulation overflow valve. As shown in fig. 7, the pressure regulating unit 321 includes a hydraulic pump 321a and an electric modulation relief valve 321b, and the pressure regulating unit 322 includes a hydraulic pump 322a and an electric modulation relief valve 322b, wherein the displacement of the hydraulic pump 321a and the displacement of the hydraulic pump 322a are both large enough. In the constant-pressure source composed of the hydraulic pump 321a and the electric modulation relief valve 321b, the hydraulic pump 321a is connected to the electric modulation relief valve 321b through a check valve 321c, and the check valve 321c is crucial, so that the hydraulic pump 321a and the electric modulation relief valve 321b only provide the first input pressure for the designated working port 231 of the regeneration valve 23 to be measured, but do not provide the flow. And a constant pressure source composed of the hydraulic pump 322a and the electro-modulated overflow valve 322b provides a second input pressure and an input flow rate to the second working oil port 233 of the regeneration valve 23 with the flow rate to be measured. Through the arrangement, the rod cavity and the rodless cavity in the loading oil cylinder shown in the figure 1 can be simulated. The oil outlet 234 of the regeneration valve with the flow rate to be measured is connected with the oil tank 710, so that a part of the input flow rate flows back to the oil tank through the throttle C4 of the regeneration valve with the flow rate to be measured, and the other path becomes the regeneration flow rate and flows back to the hydraulic pump 321a through the throttle C5 and C2. Therefore, the first flow rate detected by the flow sensor 411 includes the second flow rate of the first hydraulic pump 610 flowing in through the oil inlet 232 of the regeneration valve 23 with the flow rate to be measured, and also includes the regeneration flow rate, and the difference value between the first flow rate detected by the flow sensor 411 and the second flow rate detected by the flow sensor 412 is the regeneration flow rate. When the comparing unit 33 detects that the first difference and/or the second difference are/is not zero, the comparing unit correspondingly outputs control signals to the electrical modulation overflow valve 321b and/or the electrical modulation overflow valve 322b, respectively. When the comparing unit 33 detects that the first difference and the second difference are both zero, it stops outputting the control signal to the electrical modulation overflow valve 321b and the electrical modulation overflow valve 322b, and meanwhile, the processing unit 42 detects that the first difference and the second difference are both zero, and determines the difference between the first flow and the second flow as the regeneration flow corresponding to the first target pressure and the second target pressure, that is, the current regeneration flow corresponding to the first target pressure and the second target pressure is obtained.
Through the embodiment of the utility model provides a, can avoid the problem that needs to change different hydro-cylinders among the prior art in the flow regeneration characteristic test, when the flow that the pressure regulating unit provided is enough big, the accessible provides the operating condition of different host computer hydro-cylinder products of different target pressure simulation, save time and cost, the commonality is strong.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The technical idea of the utility model within the scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, makes up with any suitable mode including each concrete technical feature. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.
Claims (8)
1. A flow regeneration characteristic testing system, comprising:
the pressure regulating unit and the pressure sensor are respectively connected with a plurality of working oil ports of the flow regeneration valve to be detected, the flow sensor is respectively connected with an appointed working oil port and an oil inlet in the working oil ports of the flow regeneration valve to be detected, the comparison unit is respectively connected with the pressure sensor, the pressure regulating unit and the processing unit,
the pressure sensor is used for detecting and feeding back a plurality of feedback pressure values of a plurality of working oil ports of the flow regeneration valve to be detected;
the pressure regulating unit is used for controlling a plurality of input pressures provided for a plurality of working oil ports of the flow regeneration valve to be tested;
the flow sensor is used for detecting a first flow flowing out of an appointed working oil port of the flow regeneration valve to be detected and detecting a second flow flowing in from an oil inlet of the flow regeneration valve to be detected;
the comparison unit is used for acquiring a plurality of target pressure values from the processing unit, comparing the plurality of target pressure values with a plurality of difference values between the plurality of feedback pressure values obtained by the corresponding pressure sensor, and correspondingly controlling the input pressure of the pressure regulating unit of a working oil port which is not zero in the plurality of difference values until the plurality of difference values are all zero;
and the processing unit is configured to determine, when it is obtained that the plurality of difference values obtained by the comparing unit are all zero, a difference value between the first flow rate and the second flow rate obtained by the flow sensor as a regeneration flow rate corresponding to a target pressure value of the to-be-measured flow rate regeneration valve.
2. The flow regeneration characteristic testing system according to claim 1, wherein the pressure regulating unit comprises a pressure booster or comprises a constant pressure source.
3. The flow regeneration characteristic test system according to claim 2, wherein the constant pressure source includes a hydraulic pump and an electrical modulation overflow valve, the hydraulic pump is connected to the electrical modulation overflow valve and the working oil port of the flow regeneration valve to be tested, respectively, and the electrical modulation overflow valve is connected to the comparison unit.
4. The flow regeneration characteristic test system according to claim 3, wherein when the pressure regulating unit connected to the specified working oil port of the flow regeneration valve to be tested includes a hydraulic pump and an electric modulation overflow valve, the hydraulic pump is connected to the electric modulation overflow valve through a check valve.
5. The flow regeneration characteristic testing system of claim 1, wherein the comparison unit comprises a subtractor.
6. The flow regeneration characteristic test system of claim 1, further comprising a PID regulator connected between the comparison unit and the processing unit for modifying the plurality of target pressure values provided by the processing unit to the comparison unit.
7. The flow regeneration characteristic test system according to claim 1, wherein an oil outlet of the flow regeneration valve to be tested is connected with an oil tank.
8. The flow regeneration characteristic testing system of claim 1, further comprising a first hydraulic pump connected to an oil inlet of the flow regeneration valve under test.
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