CN113791299B - Electromagnetic valve flutter parameter testing method and system - Google Patents
Electromagnetic valve flutter parameter testing method and system Download PDFInfo
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Abstract
The invention provides a method and a system for testing flutter parameters of an electromagnetic valve, comprising the following steps: selecting m x n test points of the electromagnetic valve to be tested in a preset test interval; for each test point, testing the oil pressure fluctuation bandwidth of the electromagnetic valve to be tested under a plurality of different preset control currents, and determining the maximum oil pressure fluctuation bandwidth corresponding to the electromagnetic valve to be tested under each test point; for each test point, acquiring a pressure rising curve and a pressure falling curve of the electromagnetic valve to be tested under the control of a preset RAMP current; determining an optimal flutter parameter of the electromagnetic valve to be tested based on the pressure rising curve, the pressure falling curve and the maximum oil pressure fluctuation bandwidth; the optimal chatter parameters include: optimum dither frequency and optimum dither amplitude. The invention relieves the technical problems of poor stability and low reliability of oil pressure control in the prior art.
Description
Technical Field
The invention relates to the technical field of automobile hydraulic control, in particular to a method and a system for testing flutter parameters of an electromagnetic valve.
Background
Solenoid valves are key components in automotive hydraulic control systems. The displacement or thrust of the valve core of the electromagnetic valve is positively related to the current, if the current is kept unchanged, the position of the valve core is unchanged, the valve core and the valve body are in a static friction state, and after the current is changed, the valve core can start to move after overcoming the static friction force. The static friction force is larger than the sliding friction force, so that a viscous effect is generated, and the response speed and the control accuracy of the battery valve are reduced. Therefore, the current value can be fluctuated at a certain frequency in a small range, so that the valve element of the electromagnetic valve is in a small vibration state at all times, and a sliding friction state, namely a flutter (Dither) state, can be maintained.
Therefore, the low-amplitude high-frequency flutter signal is added to the control current of the electromagnetic valve to keep the valve core in a small-amplitude vibration state in the valve sleeve, the oil film thickness is kept between the valve core and the valve sleeve, the sliding friction state is kept, and the initial movement resistance is reduced. Otherwise, if the flutter signal is not added, the resistance is increased when the valve core moves again after stopping at a certain position, and the response speed and the control precision are affected.
Meanwhile, the pressure and the flow cannot be disturbed, the flutter signal is a high-frequency flutter signal, so that the valve core is always in a weak flutter state, the valve core can rapidly act when being driven by the action signal in the flutter state, the static stagnation force of the valve core in a movement critical state can be eliminated, the dynamic response of the valve is improved, and the influence of the valve stagnation on a system is improved.
In the prior art, the frequency and the amplitude of a flutter signal are adjusted in real time according to the oil temperature and the property of a hydraulic loop in the using process, and the method has the technical problems of poor stability and low reliability of oil pressure control.
Disclosure of Invention
Therefore, the invention aims to provide a method and a system for testing the flutter parameters of an electromagnetic valve, so as to solve the technical problems of poor stability and low reliability of oil pressure control in the prior art.
In a first aspect, an embodiment of the present invention provides a method for testing a flutter parameter of an electromagnetic valve, including: selecting m x n test points of the electromagnetic valve to be tested in a preset test interval; the preset test interval comprises a preset flutter frequency test interval and a preset flutter amplitude test interval; the preset flutter frequency test interval comprises n flutter frequency test points, and the preset flutter amplitude test interval comprises m flutter amplitude test points; one test point corresponds to one flutter frequency test point and one flutter amplitude test point; m and n are positive integers; for each test point, testing the oil pressure fluctuation bandwidth of the electromagnetic valve to be tested under a plurality of different preset control currents, and determining the maximum oil pressure fluctuation bandwidth corresponding to the electromagnetic valve to be tested under each test point; for each test point, acquiring a pressure rising curve and a pressure falling curve of the electromagnetic valve to be tested under the control of a preset RAMP current; determining an optimal flutter parameter of the solenoid valve to be tested based on the pressure rise curve, the pressure fall curve and the maximum oil pressure fluctuation bandwidth; the optimal chatter parameters include: optimum dither frequency and optimum dither amplitude.
Further, before selecting the m×n test points of the solenoid valve to be tested, the method further includes: acquiring rated flutter frequency and rated flutter amplitude of the electromagnetic valve to be tested; and determining the preset vibration frequency test interval and the preset vibration amplitude test interval based on the rated vibration frequency and the rated vibration amplitude.
Further, determining an optimal flutter parameter of the solenoid valve to be tested based on the pressure rise curve, the pressure drop curve, and the maximum oil pressure fluctuation bandwidth, comprising: calculating a pressure hysteresis curve corresponding to each test point based on the pressure rising curve and the pressure falling curve; calculating a pressure hysteresis curve corresponding to each test point, and a pressure hysteresis average value in a linear interval; calculating the fluctuation bandwidth of the pressure hysteresis in the linear interval based on the pressure hysteresis curve corresponding to each test point; and determining the test point where the optimal flutter parameter is located in m x n test points of the electromagnetic valve to be tested based on the average value of the pressure hysteresis, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point.
Further, determining the test point where the optimal flutter parameter is located in m×n test points of the solenoid valve to be tested based on the average value of the pressure hysteresis, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point, including: filtering and screening the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point respectively based on a preset oil pressure fluctuation bandwidth filtering value, a preset pressure hysteresis average value filtering value and a preset pressure hysteresis fluctuation bandwidth filtering value to obtain a test point set after screening; calculating the weighted summation of the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth for each test point in the test point set after screening to obtain a total weighted value corresponding to each test point in the test point set after screening; and in the test point set after screening, determining the test point corresponding to the minimum value of the total weighted value as the test point where the optimal flutter parameter is located.
Further, the method further comprises: and respectively testing under different oil temperatures of the automatic gearboxes to obtain the optimal flutter parameters corresponding to the oil temperatures of each automatic gearbox.
In a second aspect, an embodiment of the present invention further provides a system for testing a flutter parameter of an electromagnetic valve, including: the device comprises a selecting module, a testing module, an acquiring module and a determining module; the selecting module is used for selecting m x n test points of the electromagnetic valve to be tested in a preset test interval; the preset test interval comprises a preset flutter frequency test interval and a preset flutter amplitude test interval; the preset flutter frequency test interval comprises n flutter frequency test points, and the preset flutter amplitude test interval comprises m flutter amplitude test points; one test point corresponds to one flutter frequency test point and one flutter amplitude test point; m and n are positive integers; the testing module is used for testing the oil pressure fluctuation bandwidth of the electromagnetic valve to be tested under a plurality of different preset control currents for each testing point, and determining the maximum oil pressure fluctuation bandwidth corresponding to the electromagnetic valve to be tested under each testing point; the acquisition module is used for acquiring a pressure rising curve and a pressure falling curve of the electromagnetic valve to be tested under the control of a preset RAMP current for each test point; the determining module is used for determining the optimal flutter parameter of the electromagnetic valve to be tested based on the pressure rising curve, the pressure falling curve and the maximum oil pressure fluctuation bandwidth; the optimal chatter parameters include: optimum dither frequency and optimum dither amplitude.
Further, the determining module further includes: a first calculation unit, a second calculation unit, a third calculation unit and a determination unit; the first calculation unit is used for calculating a pressure hysteresis curve corresponding to each test point based on the pressure rising curve and the pressure falling curve; the second calculation unit is used for calculating a pressure hysteresis curve corresponding to each test point and a pressure hysteresis average value in a linear interval; the third calculation unit is used for calculating the fluctuation bandwidth of the pressure hysteresis in the linear interval based on the pressure hysteresis curve corresponding to each test point; the determining unit is used for determining the test point where the optimal flutter parameter is located in m x n test points of the electromagnetic valve to be tested based on the average value of the pressure hysteresis, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point.
Further, the determining unit is further configured to: filtering and screening the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point respectively based on a preset oil pressure fluctuation bandwidth filtering value, a preset pressure hysteresis average value filtering value and a preset pressure hysteresis fluctuation bandwidth filtering value to obtain a test point set after screening; calculating the weighted summation of the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth for each test point in the test point set after screening to obtain a total weighted value corresponding to each test point in the test point set after screening; and in the test point set after screening, determining the test point corresponding to the minimum value of the total weighted value as the test point where the optimal flutter parameter is located.
In a third aspect, an embodiment of the present invention further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor executes the computer program to implement the steps of the method described in the first aspect.
In a fourth aspect, embodiments of the present invention also provide a computer readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of the first aspect.
The invention provides a method and a system for testing flutter parameters of an electromagnetic valve, which can determine the optimal flutter parameters in a plurality of test points by placing the electromagnetic valve to be tested on an idle carrier for testing, avoid the technical problems of slow response speed and poor control precision caused by inconsistent actual parameters and nominal parameters of the electromagnetic valve to be tested, and simultaneously alleviate the technical problems of poor stability and low reliability of oil pressure control in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for testing flutter parameters of an electromagnetic valve according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a vibration RAMP current of a solenoid valve according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an electromagnetic valve amplitude parameter test and hysteresis determination according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a system for testing flutter parameters of an electromagnetic valve according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a determining module according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
the flutter (Dither) parameters of the electromagnetic valve of the automobile do not need the transmission to transmit torque, and only the input motor of the rack is required to provide rotating speed (for the electronic pump, the motor does not need to operate and mainly provides pressure for the system), so that the test can be performed on an idle test bed, but the flutter performance at different temperatures needs to be tested, so that the test needs to be performed on the idle rack of a high-temperature and low-temperature environmental cabin. In the embodiment of the invention, the electromagnetic valve is arranged on a test bed (no-load bench), the connection wire harness and the pipeline start test bed are used for testing the vibration parameters of the electromagnetic valve, the test contents comprise vibration frequency test and vibration amplitude test, the rotating speed of the bench input motor is 1000rpm, and the oil pump is driven to provide pressure.
Fig. 1 is a flowchart of a method for testing flutter parameters of an electromagnetic valve according to an embodiment of the present invention.
As shown in fig. 1, the method specifically includes the following steps:
step S102, selecting m x n test points of a solenoid valve to be tested in a preset test interval; the preset test interval comprises a preset flutter frequency test interval and a preset flutter amplitude test interval; the preset flutter frequency test interval comprises n flutter frequency test points, and the preset flutter amplitude test interval comprises m flutter amplitude test points; one test point corresponds to one flutter frequency test point and one flutter amplitude test point; m and n are positive integers.
For example, the upper limit and the lower limit of a preset flutter frequency test interval are controlled to be [10,100] Hz, and 10 flutter frequency test points are arranged by taking 10Hz as a step length; the upper limit and the lower limit of a preset vibration amplitude test interval are controlled to be 40,160 mA, 20mA is taken as a step length, and 7 vibration amplitude test points are arranged; for different frequencies and amplitudes, a total of 70 test points are formed.
Step S104, for each test point, testing the oil pressure fluctuation bandwidth of the electromagnetic valve to be tested under a plurality of different preset control currents, and determining the maximum oil pressure fluctuation bandwidth corresponding to the electromagnetic valve to be tested under each test point.
In the embodiment of the invention, the control current of the electromagnetic valve is regulated to change in a step mode among a plurality of different preset control currents, and the oil pressure fluctuation bandwidth of the electromagnetic valve to be tested, which is 200ms at last, is recorded under the plurality of different preset control currents.
Step S106, for each test point, acquiring a pressure rising curve and a pressure falling curve of the electromagnetic valve to be tested under the control of a preset RAMP current.
Step S108, determining the optimal flutter parameter of the electromagnetic valve to be tested based on the pressure rising curve, the pressure falling curve and the maximum oil pressure fluctuation bandwidth; the optimal chatter parameters include: optimum dither frequency and optimum dither amplitude.
The invention provides a method for testing flutter parameters of an electromagnetic valve, which can determine the optimal flutter parameters in a plurality of test points by placing the electromagnetic valve to be tested on an idle carrier for testing, thereby avoiding the technical problems of slow response speed and poor control precision caused by inconsistent actual parameters and nominal parameters of the electromagnetic valve to be tested, and simultaneously relieving the technical problems of poor oil pressure control stability and low reliability in the prior art.
Optionally, in the embodiment of the present invention, the preset test interval is determined according to the rated parameter/nominal parameter of the solenoid valve to be tested. Specifically, the method comprises the following steps:
acquiring rated flutter frequency and rated flutter amplitude of an electromagnetic valve to be tested;
and determining a preset vibration frequency test interval and a preset vibration amplitude test interval based on the rated vibration frequency and the rated vibration amplitude.
For example, according to the flutter frequency f of the solenoid valve to be tested provided by the manufacturer x Hz, the preset flutter frequency test interval is determined to be [ 50%. Times.f x ，150％×f x ]Sequentially testing by taking 5Hz as a step length; according to the flutter value A of the solenoid valve to be tested provided by the manufacturer x mA, determining the test interval of preset flutter amplitudeIs [ 50%. Times.A x ，150％×A x ]The test was performed sequentially with a step size of 10 mA.
Firstly, the electromagnetic valve to be tested is subjected to frequency test. Optionally, the preset control current in the embodiment of the present invention is shown in table 1, and the control current I of the electromagnetic valve to be tested is adjusted by I 1 Step change to I 4 The oil pressure data P is then recorded.
Table 1 initial parameter recommended values for solenoid valve frequency test scheme
After the test is finished, calculating the oil pressure fluctuation bandwidth of the last 200ms of each step to sequentially obtain P flu1 、P flu2 、P flu3 And P flu4 Record P flu_fi_Aj ＝max(P flu1 、P flu2 、P flu3 、P flu4 ) The method comprises the steps of carrying out a first treatment on the surface of the For each test point, P is obtained in turn flu_f1_A1 、P flu_f1_A2 、…、P flu_fi_Aj …、P flu_fn_Am . Wherein P is flu_fi_Aj And the oil pressure fluctuation bandwidth of the test points corresponding to the ith flutter frequency test point and the jth flutter amplitude test point is represented.
Then the electromagnetic valve to be tested is subjected to amplitude test, specifically, the electromagnetic valve to be tested is sequentially tested under different frequencies and amplitudes, the electromagnetic valve flutter RAMP current is controlled according to the electromagnetic valve flutter RAMP current shown in figure 2, and then the pressure rising curve P of the electromagnetic valve to be tested is recorded Up And a pressure drop curve P Down As shown in fig. 3.
Optionally, step S108 further includes the steps of:
step S1081, based on pressure rise curve P Up And a pressure drop curve P Down Calculating a pressure hysteresis curve delta P corresponding to each test point; in the embodiment of the invention, the initial stageThe values of the initial parameters are shown in table 2;
TABLE 2 initial parameter suggestion values in solenoid valve amplitude test data
| Initial parameters | Suggested values | Remarks |
| I Start | 450mA | The pressure is about 3bar (linear region starting point) |
| I End | 700mA | The pressure is about 6bar (linear region termination point) |
Wherein [ I ] Start ，I End ]Is the linear section of the pressure hysteresis curve.
Step S1082, calculating the pressure hysteresis curve corresponding to each test point, and determining the linear interval [ I ] Start ，I End ]Average value DeltaP of pressure hysteresis in Ave ；
Step S1083, calculating a linear interval [ I ] based on the pressure hysteresis curves corresponding to each test point Start ，I End ]Fluctuation bandwidth ΔP of pressure hysteresis in flu ；
Then, for the test points corresponding to the ith flutter frequency test point and the jth flutter amplitude test point, data can be obtained through test records: (. DELTA.P) Ave_fi_Aj ，△P flu_fi_Aj )；
Step S1084, based on the average DeltaP of the pressure hysteresis corresponding to each test point Ave_fi_Aj Fluctuation bandwidth DeltaP of pressure hysteresis flu_fi_Aj And maximum oil pressure fluctuation bandwidth P flu_fi_Aj And determining the test point where the optimal flutter parameter is located in m x n test points of the electromagnetic valve to be tested.
And processing the average value of the pressure hysteresis, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point obtained through the test into a table, as shown in table 3.
TABLE 3 solenoid valve Dither test parameters and evaluation index values
Optionally, step S1084 further includes the steps of:
and S41, filtering and screening the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point respectively based on a preset oil pressure fluctuation bandwidth filtering value, a preset pressure hysteresis average value filtering value and a preset pressure hysteresis fluctuation bandwidth filtering value to obtain a test point set after screening.
For example, filtering out test points of which the average pressure hysteresis value is larger than a preset average pressure hysteresis value filtering value, or the fluctuation bandwidth of the pressure hysteresis is larger than a preset fluctuation bandwidth filtering value of the pressure hysteresis, or the maximum oil pressure fluctuation bandwidth is larger than a preset fluctuation bandwidth filtering value of the pressure hysteresis, so as to obtain a test point set after screening.
And S42, calculating the weighted sum of the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth for each test point in the test point set after screening, and obtaining the total weighted value corresponding to each test point in the test point set after screening.
Optionally, the maximum oil pressure fluctuation bandwidth is multiplied by a first weight value k1, the pressure hysteresis average value is multiplied by a second weight value k2, the fluctuation bandwidth of the pressure hysteresis is multiplied by a third weight value k3, and finally the process is performedSumming and calculating to obtain a total weighted value P fi_Aj_k ；
And S43, determining the test point corresponding to the minimum value of the total weighted value as the test point where the optimal flutter parameter is located in the test point set after screening. And taking the vibration frequency and the vibration amplitude corresponding to the finally determined test point as the optimal vibration frequency and the optimal vibration amplitude of the electromagnetic valve to be tested.
Optionally, in the embodiment of the present invention, the test may be performed separately under different automatic gearbox oil temperatures by adjusting the test temperature, so as to obtain the optimal chatter parameter corresponding to each automatic gearbox oil temperature. For example, the temperature may be: 0 ℃, 30 ℃, 60 ℃, 90 ℃ and 120 ℃ to obtain optimal flutter parameters at different temperatures.
And finally, the fine adjustment can be confirmed according to the whole vehicle test result, the fluctuation condition of pressure is mainly considered in the whole vehicle test process, no matter the OG clutch or the OC clutch cannot have obvious fluctuation in the gear shifting process, the adjustment of the flutter is carried out according to the minimum step specified by TCU hardware, and the flutter amplitude is effectively adjusted.
As can be seen from the above description, the embodiment of the invention provides a method for testing the flutter parameters of an electromagnetic valve, which has the following advantages compared with the prior art: by the bench test method, the actual flutter parameters of the electromagnetic valve can be measured on the basis of the flutter parameters given by manufacturers, so that the problems of low response speed, poor control precision and the like caused by inconsistent actual parameters and nominal parameters are avoided, and the control effect is improved.
Embodiment two:
fig. 4 is a schematic diagram of a system for testing flutter parameters of an electromagnetic valve according to an embodiment of the present invention. As shown in fig. 4, the system includes: the device comprises a selection module 10, a test module 20, an acquisition module 30 and a determination module 40.
Specifically, the selecting module 10 is configured to select m×n test points of the electromagnetic valve to be tested in a preset test interval; the preset test interval comprises a preset flutter frequency test interval and a preset flutter amplitude test interval; the preset flutter frequency test interval comprises n flutter frequency test points, and the preset flutter amplitude test interval comprises m flutter amplitude test points; one test point corresponds to one flutter frequency test point and one flutter amplitude test point; m and n are positive integers.
The testing module 20 is configured to test, for each test point, an oil pressure fluctuation bandwidth of the solenoid valve to be tested under a plurality of different preset control currents, and determine a maximum oil pressure fluctuation bandwidth corresponding to the solenoid valve to be tested under each test point.
The acquiring module 30 is configured to acquire, for each test point, a pressure rising curve and a pressure falling curve of the solenoid valve to be tested under the control of a preset RAMP current.
A determination module 40 for determining an optimal flutter parameter of the solenoid valve to be tested based on the pressure rise curve, the pressure fall curve and the maximum oil pressure fluctuation bandwidth; the optimal chatter parameters include: optimum dither frequency and optimum dither amplitude.
The invention provides a system for testing the flutter parameters of an electromagnetic valve, which can determine the optimal flutter parameters in a plurality of test points by placing the electromagnetic valve to be tested on an idle carrier for testing, thereby avoiding the technical problems of slow response speed and poor control precision caused by inconsistent actual parameters and nominal parameters of the electromagnetic valve to be tested, and simultaneously relieving the technical problems of poor oil pressure control stability and low reliability in the prior art.
Optionally, fig. 5 is a schematic diagram of a determining module according to an embodiment of the present invention. As shown in fig. 5, the determining module 40 further includes: a first calculation unit 41, a second calculation unit 42, a third calculation unit 43 and a determination unit 44.
Specifically, the first calculating unit 41 is configured to calculate a pressure hysteresis curve corresponding to each test point based on the pressure rising curve and the pressure falling curve.
And a second calculating unit 42, configured to calculate a pressure hysteresis curve corresponding to each test point, and a pressure hysteresis average value in the linear interval.
The third calculation unit 43 is configured to calculate a fluctuation bandwidth of the pressure hysteresis in the linear interval based on the pressure hysteresis curve corresponding to each test point.
The determining unit 44 is configured to determine, from m×n test points of the solenoid valve to be tested, a test point where the optimal flutter parameter is located, based on the average value of the pressure hysteresis, the fluctuation bandwidth of the pressure hysteresis, and the maximum oil pressure fluctuation bandwidth corresponding to each test point.
Specifically, the determining unit 44 is further configured to:
filtering and screening the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point respectively based on a preset oil pressure fluctuation bandwidth filtering value, a preset pressure hysteresis average value filtering value and a preset pressure hysteresis fluctuation bandwidth filtering value to obtain a test point set after screening;
calculating the weighted sum of the average pressure hysteresis value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth of each test point in the test point set after screening to obtain the total weighted value corresponding to each test point in the test point set after screening;
and in the test point set after screening, determining the test point corresponding to the minimum value of the total weighted value as the test point where the optimal flutter parameter is located.
The embodiment of the invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the steps of the method in the first embodiment.
The present invention also provides a computer-readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of the first embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A method for testing flutter parameters of an electromagnetic valve, comprising the steps of:
selecting m x n test points of the electromagnetic valve to be tested in a preset test interval; the preset test interval comprises a preset flutter frequency test interval and a preset flutter amplitude test interval; the preset flutter frequency test interval comprises n flutter frequency test points, and the preset flutter amplitude test interval comprises m flutter amplitude test points; one test point corresponds to one flutter frequency test point and one flutter amplitude test point; m and n are positive integers;
for each test point, testing the oil pressure fluctuation bandwidth of the electromagnetic valve to be tested under a plurality of different preset control currents, and determining the maximum oil pressure fluctuation bandwidth corresponding to the electromagnetic valve to be tested under each test point;
for each test point, acquiring a pressure rising curve and a pressure falling curve of the electromagnetic valve to be tested under the control of a preset RAMP current;
determining an optimal flutter parameter of the solenoid valve to be tested based on the pressure rise curve, the pressure fall curve and the maximum oil pressure fluctuation bandwidth; the optimal chatter parameters include: an optimal dither frequency and an optimal dither amplitude;
wherein determining an optimal chatter parameter of the solenoid valve to be tested based on the pressure rise curve, the pressure drop curve, and the maximum oil pressure fluctuation bandwidth, comprises:
calculating a pressure hysteresis curve corresponding to each test point based on the pressure rising curve and the pressure falling curve;
calculating a pressure hysteresis curve corresponding to each test point, and a pressure hysteresis average value in a linear interval;
calculating the fluctuation bandwidth of the pressure hysteresis in the linear interval based on the pressure hysteresis curve corresponding to each test point;
and determining the test point where the optimal flutter parameter is located in m x n test points of the electromagnetic valve to be tested based on the average value of the pressure hysteresis, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point.
2. The method of claim 1, wherein prior to selecting m x n test points of the solenoid valve to be tested, the method further comprises:
acquiring rated flutter frequency and rated flutter amplitude of the electromagnetic valve to be tested;
and determining the preset vibration frequency test interval and the preset vibration amplitude test interval based on the rated vibration frequency and the rated vibration amplitude.
3. The method of claim 1, wherein determining the test point at which the optimal chatter parameter is located among the m×n test points of the solenoid valve to be tested based on the average pressure hysteresis, the fluctuation bandwidth of pressure hysteresis, and the maximum oil pressure fluctuation bandwidth corresponding to each test point comprises:
filtering and screening the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point respectively based on a preset oil pressure fluctuation bandwidth filtering value, a preset pressure hysteresis average value filtering value and a preset pressure hysteresis fluctuation bandwidth filtering value to obtain a test point set after screening;
calculating the weighted summation of the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth for each test point in the test point set after screening to obtain a total weighted value corresponding to each test point in the test point set after screening;
and in the test point set after screening, determining the test point corresponding to the minimum value of the total weighted value as the test point where the optimal flutter parameter is located.
4. The method according to claim 1, wherein the method further comprises:
and respectively testing under different oil temperatures of the automatic gearboxes to obtain the optimal flutter parameters corresponding to the oil temperatures of each automatic gearbox.
5. A solenoid valve flutter parameter test system, comprising: the device comprises a selecting module, a testing module, an acquiring module and a determining module; wherein,
the selecting module is used for selecting m x n test points of the electromagnetic valve to be tested in a preset test interval; the preset test interval comprises a preset flutter frequency test interval and a preset flutter amplitude test interval; the preset flutter frequency test interval comprises n flutter frequency test points, and the preset flutter amplitude test interval comprises m flutter amplitude test points; one test point corresponds to one flutter frequency test point and one flutter amplitude test point; m and n are positive integers;
the testing module is used for testing the oil pressure fluctuation bandwidth of the electromagnetic valve to be tested under a plurality of different preset control currents for each testing point, and determining the maximum oil pressure fluctuation bandwidth corresponding to the electromagnetic valve to be tested under each testing point;
the acquisition module is used for acquiring a pressure rising curve and a pressure falling curve of the electromagnetic valve to be tested under the control of a preset RAMP current for each test point;
the determining module is used for determining the optimal flutter parameter of the electromagnetic valve to be tested based on the pressure rising curve, the pressure falling curve and the maximum oil pressure fluctuation bandwidth; the optimal chatter parameters include: an optimal dither frequency and an optimal dither amplitude;
the determination module further includes: a first calculation unit, a second calculation unit, a third calculation unit and a determination unit; wherein,
the first calculation unit is used for calculating a pressure hysteresis curve corresponding to each test point based on the pressure rising curve and the pressure falling curve;
the second calculation unit is used for calculating a pressure hysteresis curve corresponding to each test point and a pressure hysteresis average value in a linear interval;
the third calculation unit is used for calculating the fluctuation bandwidth of the pressure hysteresis in the linear interval based on the pressure hysteresis curve corresponding to each test point;
the determining unit is used for determining the test point where the optimal flutter parameter is located in m x n test points of the electromagnetic valve to be tested based on the average value of the pressure hysteresis, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point.
6. The system according to claim 5, wherein the determining unit is further configured to:
filtering and screening the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth corresponding to each test point respectively based on a preset oil pressure fluctuation bandwidth filtering value, a preset pressure hysteresis average value filtering value and a preset pressure hysteresis fluctuation bandwidth filtering value to obtain a test point set after screening;
calculating the weighted summation of the pressure hysteresis average value, the fluctuation bandwidth of the pressure hysteresis and the maximum oil pressure fluctuation bandwidth for each test point in the test point set after screening to obtain a total weighted value corresponding to each test point in the test point set after screening;
and in the test point set after screening, determining the test point corresponding to the minimum value of the total weighted value as the test point where the optimal flutter parameter is located.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of any of the preceding claims 1 to 4 when the computer program is executed.
8. A computer readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of any of claims 1-4.
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