A test and evaluation method for reflective photoelectric angle sensor products

Abstract

The present invention discloses a test and evaluation method for a reflective photoelectric angle sensor product, relates to the technical field of photoelectric angle sensors, and solves the technical problems that the existing photoelectric angle sensor detection method has poor accuracy and very large limitations in detection mode when in use; the technical key points are: by using a servo slide module to convert the rotation angle into a moving distance, changing the acquisition method of the number of rotations (or rotation angles) of the photoelectric angle sensor, the error during detection is reduced, and at the same time, the rotation of the photoelectric angle sensor is conveniently and accurately detected, and then according to the working state of the stepper motor, the rotation stability estimated value of the photoelectric angle sensor before installation is obtained, and then according to the position relationship between the photoelectric angle sensor and the qualified threshold range, the weight coefficient of the photoelectric angle sensor during detection is adjusted, thereby eliminating the interference caused by the stepper motor itself, thereby ensuring the accuracy of the rotation stability estimated value of the photoelectric angle sensor after installation.

Description

Technical Field

[0001] The present invention relates to the technical field of photoelectric angle sensors, and in particular to a test and evaluation method for reflective photoelectric angle sensor products. Background Art

[0002] Photoelectric angle sensor is a precision instrument device for angle measurement. It is widely used in aerospace, precision machine tools, robots and other fields involving angle measurement. Resolution is an important performance indicator of photoelectric angle sensor. As the performance requirements of various industries for photoelectric angle sensors continue to increase, the requirements for resolution indicators are also increasing. Therefore, this also puts higher requirements on the resolution test method of photoelectric angle sensor. Traditional photoelectric angle sensors use motors and shaft systems to drive the rotor of the photoelectric angle sensor to rotate, and then measure the fluctuation of the position angle count value output by it. This method can measure the resolution of the entire circle, but it is not convenient for high-precision factory inspection.

[0003] At present, the Chinese patent with the existing patent application number: 'CN202211681471.4' discloses a method for testing the linearity of an angle sensor, comprising the following steps: S100: obtaining the theoretical linear equation of the angle sensor; S200: obtaining the actual value of the output of the angle sensor through the test system; S300: performing linear fitting by the least square method according to the corresponding relationship between the measured value and the angle to obtain the actual linear equation; S400: obtaining the linearity of the angle sensor according to the theoretical linear equation and the actual linear equation. Although this comparative document can improve the detection efficiency of the photoelectric angle sensor to a certain extent, it cannot reflect the various real situations of the actual use of the photoelectric angle sensor, so this detection method cannot accurately detect the problems existing in the photoelectric angle sensor, and blindly pursues detection efficiency, while ignoring the most important purpose of detection, which is to ensure strict control of product quality.

[0004] However, during the implementation of the above technical solution, it was found that there were at least the following technical problems:

[0005] The accuracy is poor, and the detection method has very large limitations: when using the existing photoelectric angle sensor detection method, it is mainly to drive the photoelectric angle sensor to rotate through auxiliary equipment, and it needs to reach a specific angle, for example, 30°, 60°, ..., 360°, etc., and then compare it with the value output by the photoelectric angle sensor to determine whether the photoelectric angle sensor detection is accurate. However, this method has very large limitations. For example, the accuracy of the rotation angle of the photoelectric angle sensor cannot be ensured: the detection of the photoelectric angle sensor requires the help of auxiliary equipment to drive it to rotate, and whether it is rotated into place depends on the accuracy of the standard angle sensor inside the auxiliary equipment. This results in that when the standard angle sensor fails, the photoelectric angle sensors that have passed the subsequent inspection will fail, and this failure is not easy to detect. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides a test and evaluation method for a reflective photoelectric angle sensor product, which solves the problems raised in the background technology.

[0008] (II) Technical solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A test and evaluation method for a reflective photoelectric angle sensor product, the test and evaluation method comprising:

[0011] According to the model of the photoelectric angle sensor to be tested, the corresponding preset rotation rate and evaluation threshold range are retrieved, the stepper motor is controlled to drive the photoelectric angle sensor to rotate at the rotation rate, and the working parameters and signal waveform of the photoelectric angle sensor during the rotation process are collected, and the collected working parameters are compared with the evaluation threshold range. When the collected working parameters are within the corresponding evaluation threshold range, no response is made; otherwise, an error warning is issued;

[0012] The working parameters include the rotation time per unit angle, the rotation speed of time feedback, the maximum rotation resistance value and the minimum rotation resistance value;

[0013] Using preset environmental parameters, simulating the external environment of the photoelectric angle sensor in use, and recording the working parameters of the photoelectric angle sensor in real time, obtaining an external environmental impact assessment value, comparing the external environmental impact assessment value with the tolerance threshold, and determining the environmental tolerance of the photoelectric angle sensor, wherein the environmental simulation is completed based on the environmental control unit, the parameter monitoring unit and the data transmission unit;

[0014] When the photoelectric angle sensor is in the detection condition, the parameter monitoring unit and the environment control unit are triggered at the same time, the environment control unit simulates the external environment when the photoelectric angle sensor is in use, and the parameter monitoring unit collects the working parameters and actual environmental parameters of the photoelectric angle sensor during detection; and when the environment control unit is in the working state, the transmission unit is triggered to upload the working parameters collected by the parameter monitoring unit;

[0015] According to the working parameters of the photoelectric angle sensor during the detection process, the photoelectric angle sensor life impact value is generated, and then combined with the external environment impact assessment value to obtain the photoelectric angle sensor service life estimate. When the service life estimate enters the preset alarm range, the recycling strategy is executed.

[0016] Further, the band: the starting point is when the low level is converted to the high level, and the end point is when the high voltage is converted to the low level for the first time; the signal waveform in the signal waveform diagram is divided into multiple bands, and two bands are randomly selected for comparison;

[0017] When the two bands overlap, no response is made; otherwise, a recovery command is issued to the photoelectric angle sensor and the recovery strategy is executed.

[0018] Furthermore, a stepper motor is used as the installation carrier of the photoelectric angle sensor. The speed balance of the stepper motor is analyzed before and after the installation of the photoelectric angle sensor. The speed balance analysis process is as follows:

[0019] Set the initial rotation time, growth ratio and detection times of the stepper motor, which are recorded as , 、n, ;

[0020] Collect the actual speed of the stepper motor , during the rotation time , , ,……, The number of rotations under , , ,……, ;

[0021] By analyzing the formula Calculate the estimated rotation stability of the photoelectric angle sensor before installation , where Indicates the rotation time of the stepper motor during the i-th detection, Indicates the rotation time is The number of revolutions of the stepper motor. Respectively represent the weights of the average rotation rate and the rotation speed difference of the stepper motor;

[0022] Estimate the rotational stability before installation The preset qualified threshold interval Compare, when the rotation is stable, the estimated value Greater than the upper threshold of eligibility When the rotation stability estimate is Less than the lower threshold When the rotation is stable, the command is issued to replace the new stepper motor; In the qualified threshold range When the time is within, an adjustment instruction is issued and the adjustment strategy is executed;

[0023] Similarly, calculate the estimated rotation stability of the photoelectric angle sensor after installation .

[0024] Furthermore, when an adjustment instruction is received, the adjustment strategy is executed. The process of executing the adjustment strategy is as follows:

[0025] Extract the estimated rotational stability of the photoelectric angle sensor before installation ;

[0026] According to the estimated rotation stability of the photoelectric angle sensor before installation Upper threshold of qualification The positive and negative values ​​of the difference between them correspond to the adjustment ratio. After m times of adjustment, the estimated value of rotation stability Greater than the upper threshold of eligibility , weight coefficient and The adjustment formula is as follows;

[0027]

[0028] In the formula, Represent the weight coefficients and The preset adjustment ratio of for The weight coefficient after m adjustments is: for The weight coefficient after m adjustments.

[0029] Furthermore, the average number of rotations of the stepper motor is collected by conversion. The specific process is as follows:

[0030] The photoelectric angle sensor is mounted on the stepper motor, and the output shaft is connected to the servo slide module. The specification parameters of the servo slide module are obtained at the same time. The specification parameters include the pitch and the sliding length, which are recorded as , ;

[0031] Collect the specified length of the servo slide module sliding during the rotation of the stepper motor Time required , get the actual speed of the stepper motor ;

[0032] Will and Substitute into the analysis formula Calculate the rotation time of the stepper motor The number of rotations.

[0033] Furthermore, the environmental parameters include temperature, humidity, air pressure, vibration frequency and vibration amplitude. The parameter monitoring unit is installed on the surface of the photoelectric angle sensor. The specific process of the environmental control unit simulating the external environment of the photoelectric angle sensor is as follows:

[0034] Record the rotation stability estimate of the photoelectric angle sensor in the initial state ;

[0035] Detect the current environmental parameters of the photoelectric angle sensor, compare them with the preset environmental parameters, calculate the difference between the initial environmental parameters and the preset environmental parameters, select the adjustment direction based on the positive or negative value of the difference, and set the deviation standard rate;

[0036] Temperature limit range analysis: Increase the temperature in the simulation state and calculate the estimated rotation stability of the photoelectric angle sensor in the simulation state , and compare it with the estimated rotation stability in the initial state When the deviation rate is equal to the set standard deviation rate, the simulated temperature at this time is recorded as the upper limit temperature of the normal range; similarly, when the temperature under the simulation state is lowered, when the deviation rate is equal to the set standard deviation rate, the simulated temperature at this time is recorded as the upper limit temperature of the normal range;

[0037] Similarly, according to the temperature limit range analysis method, the humidity, air pressure, vibration frequency and vibration amplitude limit ranges of the photoelectric angle sensor are obtained.

[0038] Furthermore, the specific analysis process of generating the external environment impact assessment value of the photoelectric angle sensor is as follows:

[0039] Get the temperature values ​​of X collection points outside the photoelectric angle sensor and the thermal insulation rate of the photoelectric angle sensor, recorded as , ;

[0040] By analyzing the formula Calculate the impact assessment value of the external environment on the photoelectric angle sensor , where It indicates the temperature value detected by the zth collection point outside the photoelectric angle sensor. It represents the thermal insulation rate of the zth collection point outside the photoelectric angle sensor, and S represents the external area of ​​the photoelectric angle sensor.

[0041] Furthermore, the external environmental impact assessment value is compared with the tolerance threshold to determine the environmental tolerance of the photoelectric angle sensor. The specific analysis process is as follows:

[0042] The impact assessment value of the external environment of the photoelectric angle sensor is calculated , substitute Calculate the upper limit of the photoelectric angle sensor , where denote the proportionality coefficients affecting the evaluation value and the estimated value of the rotation stability after the photoelectric angle sensor is installed, and , e represents a natural constant;

[0043] To bear the upper limit As a dividing line, when the upper limit ≥ the preset tolerance threshold, no response will be made and the impact assessment value The corresponding photoelectric angle sensor is recorded as a qualified product; otherwise, when the tolerance threshold is greater than the tolerance upper limit , then the impact assessment value The corresponding photoelectric angle sensor is recorded as an abnormal product and needs to be recycled.

[0044] Furthermore, according to the working parameters of the photoelectric angle sensor during the detection process, the life impact value of the photoelectric angle sensor is generated. The formula used is as follows:

[0045]

[0046] In the formula, Indicates the unit angle rotation time of the photoelectric angle sensor. Indicates the actual speed of the photoelectric angle sensor. Indicates the maximum resistance value during the rotation of the photoelectric angle sensor. Indicates the minimum resistance value of the photoelectric angle sensor during rotation. The proportional coefficients of the unit angle rotation time, actual rotation speed, maximum rotation resistance value and minimum rotation resistance value, respectively, and , , .

[0047] Furthermore, the lifespan impact value External environmental impact assessment value Combined, the estimated service life of the photoelectric angle sensor is obtained The formula is as follows:

[0048]

[0049] In the formula, They respectively represent the weights of the external environment impact assessment value and the lifespan impact value.

[0050] (III) Beneficial effects

[0051] The present invention provides a test and evaluation method for a reflective photoelectric angle sensor product, which has the following beneficial effects:

[0052] 1. By using the servo slide module to convert the rotation angle into the moving distance, the acquisition method of the number of rotations (or rotation angles) of the photoelectric angle sensor is changed to reduce the error during detection, and at the same time, the rotation of the photoelectric angle sensor is detected accurately. Then, according to the set initial rotation time, growth ratio and number of detections, the rotation stability estimation value of the photoelectric angle sensor before installation is obtained, and then according to its position relationship with the qualified threshold range, the weight coefficient of the photoelectric angle sensor during detection is adjusted, thereby ensuring the accuracy of the rotation stability estimation value of the photoelectric angle sensor after installation, thereby eliminating the interference caused by the stepper motor itself;

[0053] 2. Use the preset environmental parameters to simulate the working state of the photoelectric angle sensor under actual use, and then generate an evaluation value that can evaluate the degree of influence of the external environment on the photoelectric angle sensor based on the working parameters obtained in this process, so as to facilitate an intuitive understanding of the degree of environmental interference that the photoelectric angle sensor can withstand. At the same time, it can also conduct targeted testing based on customer demand for the product. In addition, it is combined with the life impact value under different use conditions to obtain an estimated value of the service life of the equipment under different use conditions, which is convenient for subsequent screening of products that meet different environmental requirements as needed, and provides an important screening basis for product production and classification. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is the overall structure flow chart of the present invention;

[0055] Figure 2 It is an assembly diagram of the servo slide module, the stepper motor and the photoelectric angle sensor of the present invention;

[0056] Figure 3 It is a schematic diagram of splitting the signal waveform diagram of the present invention. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] Research and development concept: Example

[0059] See also Figure 1 , This embodiment provides a test and evaluation method for a reflective photoelectric angle sensor product. By using a servo slide module to convert the rotation angle into a moving distance, the acquisition method of the number of rotations (or rotation angles) of the photoelectric angle sensor is changed to reduce the error during detection, and at the same time, the rotation of the photoelectric angle sensor is conveniently and accurately detected. Then, according to the set initial rotation time, growth ratio and number of detections, the rotation stability estimation value of the photoelectric angle sensor before installation is obtained, and then according to its positional relationship with the qualified threshold range, the weight coefficient of the photoelectric angle sensor during detection is adjusted, thereby ensuring the accuracy of the rotation stability estimation value of the photoelectric angle sensor after installation, thereby eliminating the interference caused by the stepper motor itself, and solving the technical problems that the existing photoelectric angle sensor detection method has poor accuracy and very large limitations when in use. The partial scheme of the test and evaluation method is as follows:

[0060] Self-test of testing equipment

[0061] The detection of the photoelectric angle sensor requires the help of auxiliary equipment to drive it to rotate, and whether it rotates in place depends on the accuracy of the standard angle sensor inside the auxiliary equipment. This means that when the standard angle sensor fails, the photoelectric angle sensors that pass the subsequent detection will fail, and this failure is not easy to detect. Therefore, in order to prevent the stepper motor from interfering with the photoelectric angle sensor during detection, it is necessary to detect the use of the stepper motor. The specific steps are as follows:

[0062] S11, using a stepper motor as the mounting carrier of the photoelectric angle sensor, such as Figure 2 As shown in the figure, the speed balance of the stepper motor before and after the installation of the photoelectric angle sensor, the speed balance analysis process is as follows:

[0063] S12, set the initial rotation time, growth ratio and detection times of the stepper motor, which are recorded as , 、n, ;

[0064] S13, collect the actual speed of the stepper motor , during the rotation time , , ,……, The number of rotations under , , ,……, ;

[0065] S14. By analyzing the formula Calculate the estimated rotation stability of the photoelectric angle sensor before installation , where Indicates the rotation time of the stepper motor during the i-th detection, Indicates the rotation time is The number of revolutions of the stepper motor. Respectively represent the weights of the average rotation rate and the rotation speed difference of the stepper motor;

[0066] S15. Estimated rotational stability before installation The preset qualified threshold interval Compare, when the rotation is stable, the estimated value Greater than the upper threshold of eligibility When the rotation stability estimate is Less than the lower threshold When the rotation is stable, the command is issued to replace the new stepper motor; In the qualified threshold range When the time is within the range, an adjustment instruction is issued and the adjustment strategy is executed;

[0067] S16, Similarly, in the rotation stability estimation Greater than the upper threshold of eligibility When the photoelectric angle sensor is installed on the stepper motor, the above data is collected to calculate the estimated rotation stability after the photoelectric angle sensor is installed. ; When an adjustment instruction is issued, it is necessary to wait for the adjustment before performing detection and calculation.

[0068] The above scheme can detect the rotation stability estimation value before and after the photoelectric angle sensor is installed. and However, with the continuous use of the stepper motor, its internal structure will be worn to a certain extent, which will cause errors. For example, the initial setting speed is 10r / s, but with the continuous aging of the internal equipment of the stepper motor, the output power changes, so the actual output speed may be only 9.5-9.8r / s. Therefore, it is no longer possible to calculate and test based on the initial setting speed of 10r / s. For this reason, we need to test the actual situation of the stepper motor and then make targeted adjustments.

[0069] (1) Average rotation number detection: The average rotation number of the stepper motor is collected by conversion. The specific process is as follows:

[0070] S21, mount the photoelectric angle sensor on the stepper motor, connect the output shaft to the servo slide module, and obtain the specification parameters of the servo slide module, including the pitch and the sliding length, which are recorded as , ;

[0071] S22: Collect the data of the servo slide module sliding a specified length during the rotation of the stepper motor Time required , get the actual speed of the stepper motor , is the average speed, and then multiply it by the pitch to get the actual speed of the stepper motor for one revolution. ;

[0072] S23, and Substitute into the analysis formula Calculate the rotation time of the stepper motor The number of rotations.

[0073] (2) Adjustment strategy: When an adjustment instruction is received, the adjustment strategy is executed. The process of executing the adjustment strategy is as follows:

[0074] S21. Extract the estimated rotation stability of the photoelectric angle sensor before installation ;

[0075] S22, based on the estimated rotation stability of the photoelectric angle sensor before installation Upper threshold of qualification The positive and negative values ​​of the difference between them correspond to the adjustment ratio. After m times of adjustment, the estimated value of rotation stability Greater than the upper threshold of eligibility , weight coefficient and The adjustment formula is as follows;

[0076]

[0077] In the formula, Represent the weight coefficients and The preset adjustment ratio, for The weight coefficient after m adjustments is: for The weight coefficient after m adjustments.

[0078] After the above adjustments, , Substituting the modified weight into the formula, we get .

[0079] Sensor status detection

[0080] According to the model of the photoelectric angle sensor to be tested, the corresponding preset rotation rate and evaluation threshold range are called up, the stepper motor is controlled to drive the photoelectric angle sensor to rotate at the rotation rate, and the working parameters of the photoelectric angle sensor during the rotation process are collected (the working parameters include the rotation time per unit angle, the rotation speed of time feedback, the maximum rotation resistance value, and the minimum rotation resistance value) and the signal waveform.

[0081] The collected working parameters are compared with the evaluation threshold interval. When the collected working parameters are within the corresponding evaluation threshold interval, no response is made; otherwise, an error warning is issued and the photoelectric angle sensor is recovered. Taking the rotation speed as an example, the rotation speed of the photoelectric angle sensor during operation is 20r / s, and the evaluation threshold interval for the rotation speed is [19,21]. The rotation speed actually fed back by the photoelectric angle sensor is 18r / s, which is not within the corresponding rotation speed evaluation threshold interval [19,21]. In this case, an error warning is issued and the photoelectric angle sensor is recovered. Similarly, the unit angle rotation time, the maximum rotation resistance value and the minimum rotation resistance value are detected, wherein the unit angle rotation time indicates the time required for the photoelectric angle sensor to rotate one circle, the maximum rotation resistance value and the minimum rotation resistance value respectively indicate the maximum and minimum resistance values ​​encountered by the photoelectric angle sensor during its rotation. For example, when the photoelectric angle sensor rotates one circle, the resistance received is [0.1, 0.3], then 0.3 indicates the maximum resistance value of the photoelectric angle sensor during its rotation, and 0.1 indicates the minimum resistance value of the photoelectric angle sensor during its rotation.

[0082] The signal waveform is processed by comparison. Before the comparison, the signal waveform needs to be split into different numbers of bands. Then the bands are divided according to the degree of overlap between them, and a response strategy is executed. That is, when two bands overlap, no response is made. Otherwise, a recovery command is issued to the photoelectric angle sensor, and a recovery strategy is executed.

[0083] Band: The starting point is when the low level is converted to the high level, and the end point is when the high voltage is converted to the low level for the first time; the signal waveform in the signal waveform diagram is divided into multiple bands, and two bands are randomly selected for comparison.

[0084] Environmental simulation

[0085] In order to more comprehensively detect the adaptability of the photoelectric angle sensor under different conditions, the preset environmental parameters are used to simulate the external environment of the photoelectric angle sensor in use, and the working parameters of the photoelectric angle sensor are recorded in real time to obtain the external environmental impact assessment value, and the external environmental impact assessment value is compared with the tolerance threshold to determine the photoelectric angle sensor's tolerance to the environment. The environmental simulation is completed based on the environmental control unit, the parameter monitoring unit and the data transmission unit;

[0086] When the photoelectric angle sensor is under detection conditions, the parameter monitoring unit and the environmental control unit are triggered at the same time. The environmental control unit simulates the external environment of the photoelectric angle sensor when it is in use, and the parameter monitoring unit collects the working parameters and actual environmental parameters of the photoelectric angle sensor during detection; and when the environmental control unit is in working condition, the transmission unit is triggered to upload the working parameters collected by the parameter monitoring unit. Environmental parameters include temperature, humidity, air pressure, vibration frequency and vibration amplitude. The parameter monitoring unit is installed on the surface of the photoelectric angle sensor. The specific process of the parameter monitoring unit simulating the external environment of the photoelectric angle sensor is as follows:

[0087] S31, record the rotation stability estimation value of the photoelectric angle sensor in the initial state (i.e. the estimated value of rotation stability detected after the photoelectric angle sensor is installed in an indoor environment);

[0088] S32, detect the current environmental parameters of the photoelectric angle sensor (environmental data in the detection room), compare them with the preset environmental parameters, calculate the difference between the initial environmental parameters and the preset environmental parameters, and select the adjustment direction based on the positive or negative difference. Take temperature as an example, the set temperature is 65°C, and the current temperature is 25°C, then the difference between the initial environmental parameters and the preset environmental parameters is 65-25°C=40°C, therefore, the temperature needs to be raised, otherwise, the temperature needs to be lowered, providing parameter basis for the adjustment of the thermostat and setting the deviation standard rate;

[0089] S33, taking temperature as an example, the analysis process of the temperature limit range is as follows: adjust the temperature in the simulation state, calculate the rotation stability estimate of the photoelectric angle sensor in the simulation state , and compare it with the estimated rotation stability in the initial state When the deviation rate is equal to the set deviation standard rate, the simulated temperature at this time is recorded as the upper limit temperature of the normal range; similarly, when the temperature under the simulation state is lowered, when the deviation rate is equal to the set deviation standard rate, the simulated temperature at this time is recorded as the upper limit temperature of the normal range. After the adjustment in step S32, the environment where the photoelectric angle sensor is located is consistent with the preset environment, and the tolerance temperature range of the photoelectric angle sensor (i.e., the temperature limit range) can be tested at this time;

[0090] For example, the upper limit temperature: the initial temperature is 25°C. By increasing the temperature, when the temperature of the photoelectric angle sensor is increased to 65°C, the estimated value of rotation stability is and rotational stability estimates The deviation rate between them is equal to the deviation standard rate. At this time, 65℃ is the upper limit temperature of the normal range. Similarly, the lower limit temperature: by lowering the temperature of the photoelectric angle sensor, when the temperature of the photoelectric angle sensor is lowered to -8℃, the rotation stability estimation value and rotational stability estimates The deviation rate is equal to the standard deviation rate, and -8℃ is the lower limit temperature of the normal range.

[0091] Similarly, according to the analysis method, the temperature, humidity, air pressure, vibration frequency and vibration amplitude limit ranges of the photoelectric angle sensor are obtained, and the limit ranges are marked on the photoelectric angle sensor.

[0092] According to the above simulation process, the external environment impact assessment value is calculated, and the specific analysis process of generating the external environment impact assessment value of the photoelectric angle sensor is as follows:

[0093] Get the temperature values ​​of X collection points outside the photoelectric angle sensor and the thermal insulation rate of the photoelectric angle sensor, recorded as , ;

[0094] By analyzing the formula Calculate the impact assessment value of the external environment on the photoelectric angle sensor , where It indicates the temperature value detected by the zth collection point outside the photoelectric angle sensor. It represents the thermal insulation rate of the zth collection point outside the photoelectric angle sensor, and S represents the external area of ​​the photoelectric angle sensor.

[0095] The external environmental impact assessment value is compared with the tolerance threshold to determine the environmental tolerance of the photoelectric angle sensor. The specific analysis process is as follows:

[0096] The impact assessment value of the external environment of the photoelectric angle sensor is calculated , substitute Calculate the upper limit of the photoelectric angle sensor , where denote the proportionality coefficients affecting the evaluation value and the estimated value of the rotation stability after the photoelectric angle sensor is installed, and , e represents a natural constant;

[0097] To bear the upper limit As a dividing line, when the upper limit ≥ the preset tolerance threshold, no response will be made and the impact assessment value The corresponding photoelectric angle sensor is recorded as a qualified product; otherwise, when the tolerance threshold is greater than the tolerance upper limit , then the impact assessment value The corresponding photoelectric angle sensor is recorded as an abnormal product and needs to be recycled.

[0098] Lifetime Estimation

[0099] Generate the impact value of photoelectric angle sensor life according to the working parameters of the photoelectric angle sensor during the detection process The formula used is as follows:

[0100]

[0101] In the formula, Indicates the unit angle rotation time of the photoelectric angle sensor. Indicates the actual speed of the photoelectric angle sensor. Indicates the maximum resistance value during the rotation of the photoelectric angle sensor. Indicates the minimum resistance value of the photoelectric angle sensor during rotation. The proportional coefficients of the unit angle rotation time, actual rotation speed, maximum rotation resistance value and minimum rotation resistance value, respectively, and , , .

[0102] The lifespan impact value External environmental impact assessment value Combined, the estimated service life of the photoelectric angle sensor is obtained The formula used is as follows:

[0103]

[0104] In the formula, They represent the weights of the external environment impact assessment value and the life impact value respectively. When the estimated service life value enters the preset alarm range, the recycling strategy is executed. Otherwise, it means that the service life of the equipment meets the locking standard and is a qualified product.

[0105] It can be freely set according to needs. For example, the customer needs a photoelectric angle sensor with low temperature resistance (1-5°C). Therefore, the temperature is set to 1-5°C during environmental simulation to obtain the external environmental impact assessment value at this time. , and then compare the life impact value of the photoelectric angle sensor under the use status Combined, the estimated service life of the photoelectric angle sensor in the temperature range of "1-5℃" is obtained , and then you can select according to the value.

[0106] The weight coefficient is determined by the coefficient of variation method, which is a method of weighting each indicator according to the degree of variation between the current value of each evaluation indicator and the target value. If the numerical difference of an indicator is large, it can clearly distinguish the evaluated objects, indicating that the indicator has rich discrimination information, and thus the indicator should be given a larger weight. On the contrary, if the numerical difference of each evaluated object on a certain indicator is small, then the ability of this indicator to distinguish the evaluation objects is weak, and thus the indicator should be given a smaller weight. This method directly uses the information contained in each indicator and obtains the weight of the indicator through calculation, so it is objective.

[0107] In the application, the several formulas involved are all calculated by taking their numerical values ​​after removing the dimensions, and the formulas are established by collecting a large amount of data and performing software simulation to obtain a formula for the most recent actual situation. Some coefficients or weights in the formulas are set by technical personnel in this field according to actual conditions, so they will not be elaborated here.

[0108] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product. A person of ordinary skill in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution.

[0109] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0110] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A test and evaluation method for a reflective photoelectric angle sensor product, characterized in that: The test assessment method includes: According to the model of the photoelectric angle sensor to be tested, the corresponding preset rotation rate and evaluation threshold range are retrieved, the stepper motor is controlled to drive the photoelectric angle sensor to rotate at the rotation rate, and the working parameters and signal waveform of the photoelectric angle sensor during the rotation process are collected, and the collected working parameters are compared with the evaluation threshold range. When the collected working parameters are within the corresponding evaluation threshold range, no response is made; otherwise, an error warning is issued; The working parameters include the rotation time per unit angle, the rotation speed of time feedback, the maximum rotation resistance value and the minimum rotation resistance value; Using preset environmental parameters, simulating the external environment of the photoelectric angle sensor in use, and recording the working parameters of the photoelectric angle sensor in real time, obtaining an external environmental impact assessment value, comparing the external environmental impact assessment value with the tolerance threshold, and determining the environmental tolerance of the photoelectric angle sensor, wherein the environmental simulation is completed based on the environmental control unit, the parameter monitoring unit and the data transmission unit; When the photoelectric angle sensor is in the detection condition, the parameter monitoring unit and the environment control unit are triggered at the same time, the environment control unit simulates the external environment when the photoelectric angle sensor is in use, and the parameter monitoring unit collects the working parameters and actual environmental parameters of the photoelectric angle sensor during detection; and when the environment control unit is in the working state, the transmission unit is triggered to upload the working parameters collected by the parameter monitoring unit; According to the working parameters of the photoelectric angle sensor during the detection process, the photoelectric angle sensor life impact value is generated, and then combined with the external environment impact assessment value to obtain the photoelectric angle sensor service life estimate. When the service life estimate enters the preset alarm range, the recycling strategy is executed.

2. A test and evaluation method for a reflective photoelectric angle sensor product according to claim 1, characterized in that: Band: The starting point is when the low level is converted to the high level, and the end point is when the high voltage is converted to the low level for the first time; the signal waveform in the signal waveform diagram is divided into multiple bands, and two bands are randomly selected for comparison; When the two bands overlap, no response is made; otherwise, a recovery command is issued to the photoelectric angle sensor and the recovery strategy is executed.

3. The test and evaluation method for a reflective photoelectric angle sensor product according to claim 1, characterized in that: A stepper motor is used as the installation carrier of the photoelectric angle sensor. The speed balance of the stepper motor is analyzed before and after the installation of the photoelectric angle sensor. The speed balance analysis process is as follows: Set the initial rotation time, growth ratio and detection times of the stepper motor, which are recorded as , 、n, ; Collect the actual speed of the stepper motor , during the rotation time , , ,……, The number of rotations under , , ,……, ; By analyzing the formula Calculate the estimated rotation stability of the photoelectric angle sensor before installation , where Indicates the rotation time of the stepper motor during the i-th detection, Indicates the rotation time is The number of revolutions of the stepper motor. Respectively represent the weights of the average rotation rate and the rotation speed difference of the stepper motor; Estimate the rotational stability before installation The preset qualified threshold interval Compare, when the rotation is stable, the estimated value Greater than the upper threshold of eligibility When the rotation stability estimate is Less than the lower threshold When the rotation is stable, the command is issued to replace the new stepper motor; In the qualified threshold range When the time is within, an adjustment instruction is issued and the adjustment strategy is executed; Similarly, calculate the estimated rotation stability of the photoelectric angle sensor after installation .

4. The test and evaluation method for a reflective photoelectric angle sensor product according to claim 3, characterized in that: When an adjustment instruction is received, the adjustment strategy is executed. The process of executing the adjustment strategy is as follows: Extract the estimated rotational stability of the photoelectric angle sensor before installation ; According to the estimated rotation stability of the photoelectric angle sensor before installation Upper threshold of qualification The positive and negative values ​​of the difference between them correspond to the adjustment ratio. After m times of adjustment, the estimated value of rotation stability Greater than the upper threshold of eligibility , weight coefficient and The adjustment formula is as follows; In the formula, Represent the weight coefficients and The preset adjustment ratio, for The weight coefficient after m adjustments is: for The weight coefficient after m adjustments.

5. A test and evaluation method for a reflective photoelectric angle sensor product according to claim 4, characterized in that: The average number of revolutions of the stepper motor is collected by conversion. The specific process is as follows: The photoelectric angle sensor is mounted on the stepper motor, and the output shaft is connected to the servo slide module. The specification parameters of the servo slide module are obtained at the same time. The specification parameters include the pitch and the sliding length, which are recorded as , ; Collect the servo slide module sliding length during the rotation of the stepper motor Time required , get the actual speed of the stepper motor ; Will and Substitute into the analysis formula Calculate the rotation time of the stepper motor The number of rotations.

6. A test and evaluation method for a reflective photoelectric angle sensor product according to claim 5, characterized in that: Environmental parameters include temperature, humidity, air pressure, vibration frequency and vibration amplitude. The parameter monitoring unit is installed on the surface of the photoelectric angle sensor. The specific process of the environmental control unit simulating the external environment of the photoelectric angle sensor is as follows: Record the rotation stability estimate of the photoelectric angle sensor in the initial state ; Detect the current environmental parameters of the photoelectric angle sensor, compare them with the preset environmental parameters, calculate the difference between the initial environmental parameters and the preset environmental parameters, select the adjustment direction based on the positive or negative value of the difference, and set the deviation standard rate; Temperature limit range analysis: Increase the temperature in the simulation state and calculate the estimated rotation stability of the photoelectric angle sensor in the simulation state , and compare it with the estimated rotation stability in the initial state When the deviation rate is equal to the set standard deviation rate, the simulated temperature at this time is recorded as the upper limit temperature of the normal range; similarly, when the temperature under the simulation state is lowered, when the deviation rate is equal to the set standard deviation rate, the simulated temperature at this time is recorded as the upper limit temperature of the normal range; Similarly, according to the temperature limit range analysis method, the humidity, air pressure, vibration frequency and vibration amplitude limit ranges of the photoelectric angle sensor are obtained.

7. The test and evaluation method for a reflective photoelectric angle sensor product according to claim 5, characterized in that: The specific analysis process for generating the external environmental impact assessment value of the photoelectric angle sensor is as follows: Get the temperature values ​​of X collection points outside the photoelectric angle sensor and the thermal insulation rate of the photoelectric angle sensor, recorded as , ; By analyzing the formula Calculate the impact assessment value of the external environment on the photoelectric angle sensor , where It indicates the temperature value detected by the zth collection point outside the photoelectric angle sensor. It represents the thermal insulation rate of the zth collection point outside the photoelectric angle sensor, and S represents the external area of ​​the photoelectric angle sensor.

8. The test and evaluation method for a reflective photoelectric angle sensor product according to claim 7, characterized in that: The external environmental impact assessment value is compared with the tolerance threshold to determine the environmental tolerance of the photoelectric angle sensor. The specific analysis process is as follows: The impact assessment value of the external environment of the photoelectric angle sensor is calculated , substitute Calculate the upper limit of the photoelectric angle sensor , where denote the proportionality coefficients affecting the evaluation value and the estimated value of the rotation stability after the photoelectric angle sensor is installed, and , e represents a natural constant; To bear the upper limit As a dividing line, when the upper limit ≥ the preset tolerance threshold, no response will be made and the impact assessment value The corresponding photoelectric angle sensor is recorded as a qualified product; On the contrary, when the tolerance threshold is greater than the tolerance upper limit , then the impact assessment value The corresponding photoelectric angle sensor is recorded as an abnormal product and needs to be recycled.

9. A test and evaluation method for a reflective photoelectric angle sensor product according to claim 8, characterized in that: Generate the impact value of photoelectric angle sensor life according to the working parameters of the photoelectric angle sensor during the detection process The formula is as follows: In the formula, Indicates the unit angle rotation time of the photoelectric angle sensor. Indicates the actual speed of the photoelectric angle sensor. Indicates the maximum resistance value during the rotation of the photoelectric angle sensor. Indicates the minimum resistance value of the photoelectric angle sensor during rotation. The proportional coefficients of the unit angle rotation time, actual rotation speed, maximum rotation resistance value and minimum rotation resistance value, respectively, and , , .

10. A test and evaluation method for a reflective photoelectric angle sensor product according to claim 9, characterized in that: The lifespan impact value External environmental impact assessment value Combined, the estimated service life of the photoelectric angle sensor is obtained The formula is as follows: In the formula, They respectively represent the weights of the external environment impact assessment value and the lifespan impact value.

Images