CN113551906B - Device and method for testing pressure fluctuation of hydraulic drive system - Google Patents
Device and method for testing pressure fluctuation of hydraulic drive system Download PDFInfo
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- CN113551906B CN113551906B CN202110871989.3A CN202110871989A CN113551906B CN 113551906 B CN113551906 B CN 113551906B CN 202110871989 A CN202110871989 A CN 202110871989A CN 113551906 B CN113551906 B CN 113551906B
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- 238000012360 testing method Methods 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001514 detection method Methods 0.000 claims abstract description 37
- 230000009194 climbing Effects 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims description 7
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- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000010998 test method Methods 0.000 claims description 2
- 239000010720 hydraulic oil Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
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- 238000005070 sampling Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
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- 238000005859 coupling reaction Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/025—Test-benches with rotational drive means and loading means; Load or drive simulation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/02—Gearings; Transmission mechanisms
- G01M13/027—Test-benches with force-applying means, e.g. loading of drive shafts along several directions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
Abstract
The application relates to a device and a method for testing pressure fluctuation of a hydraulic driving system, wherein the device comprises a testing tool, a power supply module, a pressure sensor and a testing system, the testing tool comprises a torque manager, and a testing piece is connected with the torque manager; the test system comprises a controller, wherein the controller is connected with a power supply module and is used for outputting a test starting instruction, the power supply module receives the test starting instruction and outputs a power supply signal, and the controller receives the power supply signal and outputs a voltage climbing signal; the test piece receives a voltage climbing signal to drive the torque manager to act, and outputs a pressure signal, wherein the voltage climbing speed is 0.18V/S; the pressure sensor receives the pressure signal and outputs a pressure detection signal; the test system further comprises a display device, and the controller is further connected with the pressure sensor and the display device respectively; the controller receives the pressure detection signal and outputs a pressure waveform signal; the display device receives the pressure fluctuation signal and displays a pressure fluctuation curve. The application realizes the test of the plunger pump pressure fluctuation value in a line.
Description
Technical Field
The application relates to the field of pressure fluctuation testing, in particular to a pressure fluctuation testing device of a hydraulic driving system.
Background
The hydraulic driving system uses hydraulic oil as a working medium, and utilizes the pressure of the hydraulic oil to transmit power.
Plunger pumps are an important device of hydraulic drive systems. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity, so as to realize oil absorption and pressure oil. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow adjustment and the like, and is widely applied to occasions requiring high pressure, high flow and flow adjustment, such as hydraulic presses, engineering machinery and ships.
In an automobile system, a plunger pump is used as a power source for coupling a clutch hub, and if output pressure fluctuates in the use process, the coupling state of the clutch hub is unstable, the power transmission is unstable, and finally the NVH problems such as vehicle body shaking, movement, noise and the like can be caused.
Disclosure of Invention
In order to realize the testing of the pressure fluctuation value of the plunger pump in an off-line manner, the application provides a method and a device for testing the pressure fluctuation of a hydraulic driving system and electronic equipment.
In a first aspect, the present application provides a device for testing pressure fluctuation of a hydraulic driving system, which adopts the following technical scheme:
the pressure fluctuation testing device of the hydraulic driving system comprises a testing tool, a power supply module, a pressure sensor and a testing system, wherein the testing tool comprises a torque manager, and the torque manager is connected with a testing piece;
the test system comprises a controller, wherein the controller is respectively connected with the power supply module and the test piece, the controller outputs a test starting instruction, the power supply module receives the test starting instruction and outputs a power supply signal, and the controller receives the power supply signal and outputs a voltage climbing signal;
the test piece receives the voltage climbing signal to drive the torque manager to act, wherein the voltage climbing speed is 0.18V/S;
the pressure sensor is used for detecting the pressure output by the torque manager and outputting a pressure detection signal;
the test system further comprises a display device, and the controller is further connected with the pressure sensor and the display device respectively; the controller receives the pressure detection signal, generates a pressure fluctuation curve and outputs a display signal;
the display device receives the display signal and displays a pressure fluctuation curve.
By adopting the technical scheme, the controller outputs a test start instruction, the power supply module receives the test start instruction, outputs a power supply signal, the controller receives the power supply signal and outputs a voltage climbing signal, the test piece receives the voltage climbing signal to drive the torque manager to act, the pressure sensor detects the pressure output by the torque manager in real time and outputs a pressure detection signal, the controller receives the pressure detection signal to generate a pressure fluctuation curve and output a pressure fluctuation signal, the display receives the pressure fluctuation signal to display a pressure fluctuation value, and workers can detect the pressure fluctuation value of the plunger pump under different pressure values in an offline manner through the pressure fluctuation test device.
Optionally, the pressure sensor further comprises a low-pass filter and a high-pass filter, the low-pass filter is connected with the pressure sensor, the high-pass filter is connected with the low-pass filter, the high-pass filter is further connected with the controller, and a pressure detection signal output by the pressure sensor sequentially passes through filtering processes of the low-pass filter and the high-pass filter and is transmitted to the controller.
Through adopting above-mentioned technical scheme, the setting of high pass filter and low pass filter makes the pressure detection signal of pressure sensor output pass through the processing of low pass filter and high pass filter in proper order and transmits to the controller, and low pass filter and high pass filter have filtered most interference signal, and the pressure fluctuation curve that obtains can more react the change of pressure.
Optionally, the cut-off frequency of the low-pass filter is 250Hz, and the cut-off frequency of the high-pass filter is 10Hz.
Optionally, the controller transmits a voltage ramp signal to the test piece through CAN communication.
In a second aspect, the application provides a method for testing pressure fluctuation of a plunger pump, which adopts the following technical scheme:
a method for testing force fluctuation of a column hydraulic drive system comprises the following steps,
the power supply module receives the test start instruction, outputs a power supply signal, receives the power supply signal and outputs a voltage climbing signal to drive the test piece to act;
the test piece acts to drive the torque manager to act to output a pressure signal, and the pressure sensor acquires the pressure signal in real time to output a pressure detection signal;
the controller receives the pressure detection signal in real time, generates a pressure curve, and draws an upper envelope curve and a lower envelope curve according to the pressure curve;
calculating the difference value of an upper envelope curve and a lower envelope curve in preset time by the controller, wherein the difference value of the upper envelope curve and the lower envelope curve is a pressure fluctuation value, and fitting a time pressure fluctuation curve according to the difference values of the upper envelope curve and the lower envelope curve in a plurality of preset times, wherein the time pressure fluctuation curve is a curve of the pressure fluctuation value changing along with time;
determining a corresponding pressure value in each preset time through a controller;
and obtaining a pressure fluctuation curve according to the pressure fluctuation value in the preset time and the pressure value corresponding to each preset time, wherein the pressure fluctuation curve is a curve of the pressure fluctuation value changing along with the pressure value.
Optionally, before receiving the power signal through the controller and outputting the voltage ramp signal to drive the test piece to act, the method further includes:
the controller is used for outputting an exhaust control instruction, the power supply module is used for receiving the exhaust control instruction and outputting a power signal, and the power signal is transmitted to the test piece through the controller so as to drive the test piece to act for exhausting.
Optionally, the test piece acts to drive the torque manager to act, the pressure sensor detects the pressure output by the torque manager in real time and outputs a pressure detection signal, and then the method further comprises the steps of,
and filtering the pressure detection signal through the low-pass filter and the high-pass filter in sequence to filter the static pressure signal and the dynamic pressure signal.
Optionally, the static pressure signal is a fluctuation signal of power supply and an interference signal of external electromagnetic environment when the pressure value is not acquired after the pressure sensor is electrified; the dynamic pressure signal is a signal exceeding the frequency of pressure fluctuation generated by the test piece.
Optionally, the method for drawing the upper envelope curve and the lower envelope curve according to the pressure curve specifically comprises the following steps,
acquiring the highest points of pressure curves in a plurality of preset times through a controller;
acquiring the lowest points of pressure curves in a plurality of preset times through a controller;
connecting the highest points of the pressure curves in a plurality of preset times through a controller, and drawing an upper envelope curve;
and connecting the lowest points of the pressure curves in a plurality of preset times through a controller, and drawing a lower envelope curve.
Optionally, the controller calculates the difference between the upper envelope curve and the lower envelope curve at the same time, and fits the difference to a time pressure fluctuation curve, and then the pressure fluctuation curve is subjected to 1Hz low-pass filtering.
By adopting the technical scheme, the obtained time pressure fluctuation curve is subjected to 1Hz low-pass filtering treatment, and signals higher than 1Hz are filtered, so that the time pressure fluctuation curve is conveniently read.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the controller outputs a test starting instruction, the power supply module receives the test starting instruction, a power supply signal is output, the controller receives the power supply signal to output a voltage climbing signal, the test piece receives the voltage climbing signal to act so as to drive the torque manager to act, the pressure sensor detects the pressure output by the torque manager to act in real time, a pressure detection signal is output, the controller receives the pressure detection signal and generates a pressure fluctuation curve, the pressure fluctuation signal is output, the display receives the pressure fluctuation signal to display a pressure fluctuation value, and a worker can detect the pressure fluctuation value of the plunger pump under different pressure values in an offline manner through the pressure fluctuation test device;
2. through design low pass filter and high pass filter, pressure detection signal loops through low pass filter and high pass filter and can filter the pressure curve that forms behind the interference signal in the pressure detection process, can reflect the change of pressure more.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a pressure fluctuation testing device of a hydraulic driving system.
Fig. 2 is a flowchart of a method for testing pressure fluctuation of a hydraulic drive system provided by the application.
FIG. 3 is a graph of the voltage ramp signal output by the controller and the pressure output by the torque manager over time.
Fig. 4 is a pressure curve, an upper envelope curve, a lower envelope curve, and a time pressure fluctuation curve.
Fig. 5 is a limit value curve and a pressure fluctuation curve.
Reference numerals illustrate: 1. testing a tool; 11. overturning the bracket; 12. a rear axle; 13. a torque manager; 10. a test system; 101. a controller; 102. a display device; 20. a test piece; 30. a pressure sensor; 40. a power supply module; 50. a low pass filter; 60. a high pass filter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings 1 to 5 and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The embodiment of the application discloses a pressure fluctuation testing device of a hydraulic driving system. Referring to fig. 1, the hydraulic driving system pressure fluctuation testing device comprises a testing tool 1, a power supply module 40, a pressure sensor 30 and a testing system 10, wherein the testing tool 1 comprises a torque manager 13, a rear axle 12 and a turnover bracket 11, the torque manager 13 and the rear axle 12 are connected through bolts, the torque manager 13 and the rear axle 12 are fixedly arranged on the turnover bracket 11 through bolts, and a testing piece 20 is connected with the torque manager 13 through bolts during testing. The test system 10 includes a display device 102 and a controller 101, the controller 101 being connected to the test piece 20, the power module 40, the pressure sensor 30 and the display device 102, respectively. In this embodiment, the six plungers of the test piece 20 are plunger pumps, and the control cable connector of the controller 101 is connected to the ECU connector of the plunger pumps. The torque manager 13 and the rear axle 12 are common components of the automobile, and the overturning bracket 11 only needs to overturn the torque manager 13 and the rear axle 12 in the detection, installation and disassembly processes, and will not be described in detail herein.
The controller 101 is configured to output a detection start signal, the power supply module 40 receives the detection start signal, output a power supply signal, the controller 101 receives the power supply signal, output a voltage climbing signal, and the controller 101 transmits the voltage climbing signal to the plunger pump through CAN communication, the plunger pump receives the voltage climbing signal to start working, drive the torque manager 13 to act, and the pressure sensor 30 detects the pressure output by the torque manager 13 and outputs a pressure detection signal.
The torque manager 13 includes a high-pressure chamber, a piston is disposed in the high-pressure chamber, hydraulic oil is filled in the high-pressure chamber, the plunger pump works, the hydraulic oil in the high-pressure chamber has a certain pressure, the friction plate in the clutch hub is pressed by pushing the piston to act through the hydraulic oil, the pressure sensor 30 is disposed at one end of the piston, the detection of the oil pressure in the high-pressure chamber is realized by detecting the output pressure of the piston, the oil pressure in the high-pressure chamber is provided by the plunger pump, namely, the detection of the output pressure of the plunger pump can be realized by detecting the output pressure of the piston.
The controller 101 receives the pressure detection signals, processes and calculates the multiple pressure detection signals to form a pressure fluctuation curve, outputs a display signal, and the display receives the display signal to display the pressure fluctuation curve.
The hydraulic drive system pressure fluctuation testing device further comprises a low-pass filter 50 and a high-pass filter 60, the low-pass filter 50 is connected with the pressure sensor 30, the low-pass filter 50 is further connected with the high-pass filter 60, the high-pass filter 60 is further connected with the controller 101, and pressure detection signals output by the pressure sensor 30 are sequentially processed by the low-pass filter 50 and the high-pass filter 60 and then transmitted to the controller 101, so that a more real pressure fluctuation curve is obtained.
The embodiment of the application discloses a method for testing pressure fluctuation of a hydraulic drive system. Referring to fig. 2, the hydraulic drive system pressure fluctuation test method includes:
s1: the controller 101 outputs a test start instruction, the power supply module 40 receives the test start instruction and outputs a power supply signal, and the controller 101 receives the power supply signal and outputs a voltage climbing signal to the plunger pump so as to drive the plunger pump to act.
Referring to fig. 3, the abscissa indicates time, the ordinate indicates pressure and voltage, the curve a indicates a voltage ramp signal curve indicating a change in voltage input to the plunger pump with time, and the curve B indicates a pressure curve indicating a change in pressure output from the plunger pump with time.
When the plunger pump is driven to act, a voltage climbing mode is adopted, in the embodiment, the voltage climbing rate is 0.18V/S, the increasing rate of the output pressure of the plunger pump is 0.8bar/S at the moment, namely, the output pressure of the plunger pump is increased by 0.8bar when the voltage is increased by 0.18V. In other embodiments, the voltage ramp rate may be set according to the actual situation, and is not limited herein.
S2: the plunger pump acts to drive the torque manager 13 to act, and the pressure sensor 30 detects the pressure output by the torque manager 13 in real time and outputs a pressure detection signal.
When pressure data is acquired, interference signals such as power supply signals, external noise and the like can be generated. In theory, the frequency of the pressure fluctuation generated by the plunger pump in this embodiment is between 10Hz and 250Hz, so the pressure detection signal needs to be filtered by the low-pass filter 50 and the high-pass filter 60 after step S2 to filter out the static pressure signal and the dynamic pressure signal, and then step S3 is performed. In this embodiment, the cut-off frequency of the low-pass filter 50 is 250Hz, the cut-off frequency of the high-pass filter 60 is 10Hz, and after the pressure detection signal is processed by the low-pass filter 50 and the high-pass filter 60, the static pressure signal and the dynamic pressure signal with frequencies outside 10Hz-250Hz are filtered, so that the collected pressure detection signal can accurately reflect the pressure output by the plunger pump. In this embodiment, the static pressure signal is a fluctuation signal of power supply and an interference signal of external electromagnetic environment when the pressure sensor 30 is not powered on, and the dynamic pressure signal is a signal exceeding the pressure fluctuation frequency generated by the plunger pump itself.
The cut-off frequencies of the high pass filter 60 and the low pass filter 50 can be determined according to the type and the working condition of the plunger pump, and theoretically, the plunger pump has at least 1 fluctuation and at most 6 fluctuations per rotation. The plunger pump can be divided into 1 order, 2 order, 3 order, 4 order, 5 order and 6 order according to the fluctuation times, and the frequency of the pressure fluctuation can be calculated according to the rotation speed of the plunger pump, so that the frequency is used as the setting of the filtering threshold value.
The specific calculation mode is as follows: f= (r×n)/T, where f is the cut-off frequency, r is the rotational speed of the plunger pump, and n is the order of the plunger pump. And bringing the maximum value and the minimum value of the orders into the formula, wherein the frequency obtained by two times of calculation is the threshold range of filtering.
Meanwhile, the sampling frequency of the pressure sensor 30 should be more than 2 times of the theoretical fluctuation frequency of the plunger pump, in this embodiment, the sampling frequency of the pressure sensor 30 is 1KHz, and in other embodiments, the sampling frequency of the pressure sensor 30 may be specifically set according to the fluctuation frequency of the plunger pump, so long as the sampling frequency is more than 2 times of the theoretical fluctuation frequency of the plunger pump, and no limitation is made here.
S3: the controller 101 receives the pressure detection signal output by the pressure sensor 30 in real time, obtains a pressure curve, and draws an upper envelope curve and a lower envelope curve according to the pressure curve.
Referring to fig. 4, the abscissa is time, the ordinate is pressure, the curve C is a pressure curve, the curve D is an upper envelope curve, and the curve E is a lower envelope curve.
The method for drawing the upper envelope curve and the lower envelope curve comprises the following steps:
acquiring the highest point of the pressure curves in a plurality of preset times through the controller 101;
acquiring the lowest point of the pressure curves in a plurality of preset times through the controller 101;
connecting the highest points of the pressure curves in a plurality of preset times through the controller 101, and drawing an upper envelope curve;
the lowest point of the pressure curves in a plurality of preset time is connected through the controller 101, and a lower envelope curve is drawn.
In this embodiment, the preset time is 60ms, that is, the envelope signal length is 60ms.
S4: calculating, by the controller 101, a difference between the upper envelope curve and the lower envelope curve within a preset time, i.e., a maximum value of the pressure-a minimum value of the pressure within the same preset time period; the difference value of the upper envelope curve and the lower envelope curve is a pressure fluctuation value, and a time pressure fluctuation curve is fitted according to the difference value of the upper envelope curve and the lower envelope curve in a plurality of preset times.
Referring to fig. 4, the time pressure fluctuation curve is a time variation curve of the pressure fluctuation value, and the curve F is a time pressure fluctuation curve, which represents a time variation rule of the pressure fluctuation value. To facilitate the reading of the time pressure fluctuation curve, a low pass filter 50 is used to set the cut-off frequency to 1Hz.
S5: the corresponding pressure value for each preset time period is determined by the controller 101.
S6: the controller 101 obtains a pressure fluctuation curve according to the pressure fluctuation value in the preset time and the pressure value corresponding to each preset time.
In steps S5 and S6, specifically, the plunger pump is driven to act by a voltage climbing mode, and the voltage is stepped, that is, the voltage 0V, the voltage 1S 0.18V, the voltage 2S 0.36V, … …, and so on. Therefore, the pressure value corresponding to 0S is 0bar, the pressure values corresponding to 1S are 0.8bar, the pressure values corresponding to 2S are 1.6 bar and … …, and so on. The preset time is 60ms, and the pressure value corresponding to each preset time period can be determined according to the rules.
It can be appreciated that, 1 s=1000 ms, the number of preset time periods included in 1-2S (including 1S and not including 2S) =1000 ms/60ms, each preset time period corresponds to one pressure fluctuation value, and then, the average value of the 1-2S pressure fluctuation values is calculated in the following manner: 1-2S the sum of the pressure fluctuation values corresponding to each preset time period and/or the number of preset time periods contained in 1-2S; the result obtained is the corresponding pressure fluctuation value at 0.8bar.
Referring to fig. 5, the abscissa indicates the pressure value output from the plunger pump, and the ordinate indicates the pressure fluctuation value. Curve G is a limit curve, and represents the upper limit of the pressure fluctuation value under different pressure values, wherein the upper limit of the pressure fluctuation value can be set according to the use working condition of the plunger pump and the acceptable range of noise, vibration and acoustic vibration roughness of the plunger pump on the whole vehicle, and different upper limits can be designed for different products without limitation. Each product corresponds to a limiting curve according to actual conditions. The limiting curves in fig. 5 are only examples of different situations. The curve H is a pressure fluctuation curve, and represents corresponding pressure fluctuation values under different pressure values, in order to ensure the accuracy of the test, multiple measurements are adopted, and in this embodiment, five measurements are performed to obtain that different pressure fluctuation curves all conform to the pressure fluctuation range, that is, the plunger pump can be normally and practically used. In other embodiments, the number of measurements may be set according to the actual situation, which is not limited herein.
Before the oil pressure fluctuation test is performed, the plunger pump is required to be subjected to exhaust treatment, hydraulic oil is injected into the plunger pump, the controller 101 outputs an exhaust control instruction, the power supply module 40 receives the exhaust control instruction and outputs a power supply signal, the controller 101 receives the power supply signal and transmits the power supply signal to the plunger pump, the plunger pump acts to drive the hydraulic oil to flow, when the hydraulic oil passes through the pressure relief valve, the hydraulic pressure is increased, and the pressure relief valve is opened to discharge gas in the plunger pump. The plunger pump is subjected to exhaust treatment, so that a stable test environment can be obtained, and the influence of bubbles on the hydraulic fluctuation test is eliminated.
The running condition of the plunger pump can be judged by detecting the pressure fluctuation of the plunger pump, the smaller the pressure fluctuation is, the more stable the running is, and when the pressure fluctuation exceeds the limit value, the plunger pump needs to be maintained or replaced.
The foregoing description of the preferred embodiments of the application is not intended to limit the scope of the application in any way, including the abstract and drawings, in which case any feature disclosed in this specification (including abstract and drawings) may be replaced by alternative features serving the same, equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
Claims (9)
1. The pressure fluctuation testing method of the hydraulic drive system is characterized by being applied to a pressure fluctuation testing device of the hydraulic drive system, wherein the pressure fluctuation testing device of the hydraulic drive system comprises a testing tool (1), a power supply module (40), a pressure sensor (30) and a testing system (10), the testing tool (1) comprises a torque manager (13), and the torque manager (13) is connected with a testing piece (20);
the test system (10) comprises a controller (101), wherein the controller (101) is respectively connected with the power supply module (40) and the test piece (20), the controller (101) outputs a test starting instruction, the power supply module (40) receives the test starting instruction and outputs a power supply signal, and the controller (101) receives the power supply signal and outputs a voltage climbing signal;
the test piece (20) receives the voltage climbing signal to drive the torque manager (13) to act, and the voltage climbing speed is 0.18V/S;
the pressure sensor (30) is used for detecting the pressure output by the torque manager (13) and outputting a pressure detection signal;
the test system (10) further comprises a display device (102), and the controller (101) is further connected with the pressure sensor (30) and the display device (102) respectively; the controller (101) receives the pressure detection signal, generates a pressure fluctuation curve, and outputs a display signal;
the display device (102) receives the display signal and displays a pressure fluctuation curve;
the method comprises the following steps:
the controller (101) outputs a test start instruction, the power supply module (40) receives the test start instruction and outputs a power signal, and the controller (101) receives the power signal and outputs a voltage climbing signal to drive the test piece (20) to act;
the test piece (20) acts to drive the torque manager (13) to act to output a pressure signal, and the pressure sensor (30) acquires the pressure signal in real time to output a pressure detection signal;
the controller (101) receives the pressure detection signal in real time, generates a pressure curve, and draws an upper envelope curve and a lower envelope curve according to the pressure curve;
calculating the difference value of an upper envelope curve and a lower envelope curve in preset time by the controller (101), wherein the difference value of the upper envelope curve and the lower envelope curve is a pressure fluctuation value, and fitting a time pressure fluctuation curve according to the difference values of the upper envelope curve and the lower envelope curve in a plurality of preset times, wherein the time pressure fluctuation curve is a curve of the pressure fluctuation value changing along with time;
determining, by a controller (101), a corresponding pressure value for each preset time;
and obtaining a pressure fluctuation curve according to the pressure fluctuation value in the preset time and the pressure value corresponding to each preset time, wherein the pressure fluctuation curve is a curve of the pressure fluctuation value changing along with the pressure value.
2. The hydraulic drive system pressure fluctuation testing method according to claim 1, wherein: still include low pass filter (50) and high pass filter (60), low pass filter (50) are connected pressure sensor (30), high pass filter (60) are connected low pass filter (50), high pass filter (60) are still connected controller (101), the pressure detection signal of pressure sensor (30) output is passed through in proper order low pass filter (50) and high pass filter (60) filter processing, transmission extremely controller (101).
3. The hydraulic drive system pressure fluctuation testing method according to claim 2, wherein: the cut-off frequency of the low pass filter (50) is 250Hz and the cut-off frequency of the high pass filter (60) is 10Hz.
4. The hydraulic drive system pressure fluctuation testing method according to claim 1, wherein: the controller (101) transmits a voltage ramp signal to the test piece (20) by CAN communication.
5. The method for testing pressure fluctuation of a hydraulic drive system according to claim 4, wherein: the controller (101) receives the power signal and outputs a voltage climbing signal to drive the test piece (20) to act, and the method further comprises:
the controller (101) is used for outputting an exhaust control instruction, the power supply module (40) is used for receiving the exhaust control instruction and outputting a power signal, and the power signal is transmitted to the test piece (20) through the controller (101) so as to drive the test piece (20) to act, so that exhaust is performed.
6. A method of testing pressure fluctuations in a hydraulic drive system according to claim 3, wherein: the test piece (20) acts to drive the torque manager (13) to act, the pressure sensor (30) detects the pressure output by the torque manager (13) in real time and outputs a pressure detection signal, and then the device further comprises,
the pressure detection signal is filtered sequentially by the low-pass filter (50) and the high-pass filter (60) to filter the static pressure signal and the dynamic pressure signal.
7. The method for testing pressure fluctuation of a hydraulic drive system according to claim 6, wherein: the static pressure signal is a fluctuation signal of power supply and an interference signal of external electromagnetic environment when the pressure sensor (30) is not used for collecting a pressure value after being electrified; the dynamic pressure signal is a signal exceeding the frequency of pressure fluctuation generated by the test piece (20) itself.
8. The method for testing pressure fluctuation of a hydraulic drive system according to claim 4, wherein: the method for drawing the upper envelope curve and the lower envelope curve according to the pressure curve comprises the following steps,
acquiring the highest point of the pressure curves in a plurality of preset times through a controller (101);
acquiring the lowest point of the pressure curves in a plurality of preset times through a controller (101);
connecting the highest points of the pressure curves in a plurality of preset times through a controller (101), and drawing an upper envelope curve;
and connecting the lowest points of the pressure curves in a plurality of preset times by a controller (101), and drawing a lower envelope curve.
9. The method for testing pressure fluctuation of a hydraulic drive system according to claim 4, wherein: and calculating the difference value of the upper envelope curve and the lower envelope curve at the same moment by the controller (101), fitting the difference value into a time pressure fluctuation curve, and then processing the pressure fluctuation curve by 1Hz low-pass filtering.
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| CN202110871989.3A CN113551906B (en) | 2021-07-30 | 2021-07-30 | Device and method for testing pressure fluctuation of hydraulic drive system |
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| CN202110871989.3A CN113551906B (en) | 2021-07-30 | 2021-07-30 | Device and method for testing pressure fluctuation of hydraulic drive system |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113551906A (en) | 2021-10-26 |
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