Multifunctional high-low temperature precision test table and working method thereof

Abstract

This invention relates to the field of testing equipment technology, and in particular to a multifunctional high and low temperature precision testing bench and its working method. The method includes measuring eccentricity, closed-loop installation adjustment, acquiring dynamic angular velocity, judging noise coupling, evaluating temperature stability, measuring thermal deformation temperature waves, tracing the source and adjusting the fan speed, and adaptive thresholding. This invention eliminates geometric alignment errors by acquiring eccentricity and adjusting the installation in a closed loop. In independent turntable mode, it distinguishes between eccentric-dominated and normal noise output room temperature performance indicators based on the measured noise coupling ratio. In high and low temperature combined mode, it locates the root cause of thermal deformation or uneven temperature field based on the correlation analysis of angle range, thermal deformation, and multi-point temperature fluctuation values, and adjusts the fan speed accordingly. In independent temperature chamber mode, it extracts temperature stability indicators based on the static zero-point angle value and dynamically adjusts the threshold based on multiple performance indicators accumulated over multiple rounds. This effectively solves the problems of fragmented multi-stage testing, poor test repeatability, and increased risk of misjudgment.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and in particular to a multifunctional high and low temperature precision testing stage and its working method. Background Technology

[0002] With the widespread application of high-precision angle measuring devices in industrial automation, aerospace, and other fields, their performance verification places higher demands on the multi-functional integration capabilities of temperature environment simulation and dynamic excitation. Existing high and low temperature testing equipment is mostly a fixed-function, single-mode structure, making it difficult to achieve flexible switching between installation and commissioning, ambient temperature dynamic excitation, high and low temperature dynamic calibration, and static temperature characteristic evaluation on a single platform. This results in fragmented testing processes, repetitive clamping, and limited operating space. Even if some devices have switching capabilities, key factors such as eccentric alignment, turntable servoing, and environmental uniformity still rely on manual experience, lacking quantitative characterization and adaptive adjustment. Therefore, there is an urgent need for a high and low temperature precision testing platform with reconfigurable modes, isolated vibration sources, and intelligent decision-making.

[0003] Chinese Patent Publication No. CN102435207A discloses a two-axis turntable structure with a temperature chamber that does not require a rotary joint. The device includes a turntable structure comprising a temperature chamber and a turntable. (I) The turntable includes an azimuth axis system, an tilt axis system, and a turntable base. The turntable has a "UT" structure. The tilt axis is the outer axis of the turntable and is horizontally mounted on the turntable base. The azimuth axis is the inner axis of the turntable and is mounted on the tilt axis. The tilt axis passes horizontally through the temperature chamber, and both ends of the tilt axis are outside the temperature chamber. The bearings, driving torque motor, and angle sensor of the tilt axis system are mounted at both ends of the tilt axis. The azimuth axis system is placed inside the temperature chamber. A stepper motor is fixed to the outer shell of the azimuth axis system. A speed reducer on the stepper motor shaft... The gear set drives the azimuth axis to rotate; tapered pin holes are evenly arranged on the lower surface of the turntable, the stepper motor is connected to the small gear, the small gear meshes with the large gear, the lead screw is connected to the large gear, the lead screw is threaded to the tapered pin, and the tapered pin is matched with the tapered pin hole at the corresponding position of the azimuth axis rotation angle; (II) The temperature chamber includes a compressor unit and a temperature test chamber. The compressor unit and the temperature test chamber are connected by a hose. The temperature test chamber is installed between the azimuth axis and the tilt axis of the turntable. The temperature test chamber is installed on the temperature chamber base. The temperature chamber base is installed outside the foundation where the turntable is located. An isolation trench is provided between the temperature chamber base and the foundation where the turntable is located. The temperature chamber and the tilt axis are sealed with felt or rubber rotation.

[0004] Therefore, the existing technology has the following problems: the device relies on the mechanical transmission between the large gear and the small gear to achieve orientation positioning, and the backlash and wear generated during the gear transmission process can easily accumulate into transmission clearance; the device relies on repeated manual trial and error during installation eccentricity correction, which can easily lead to confusion between installation errors and turntable servo abnormalities; the device spatially couples the installation and calibration operation with the temperature control environment, and the installation and adjustment process must be carried out inside the temperature control cavity, which can easily result in limited operational accessibility and insufficient visual feedback. Summary of the Invention

[0005] To address this, the present invention provides a multifunctional high and low temperature precision test bench and its working method, which overcomes the problems of low functional integration, static test process, and lack of quantitative error tracing mechanism in the prior art by using mode-reconfigurable physical switching and multi-level quantitative feedback adjustment. These problems include fragmented multi-stage testing, poor test repeatability, and increased risk of misjudgment.

[0006] To achieve the above objectives, in one aspect, the present invention provides a working method for a multifunctional high and low temperature precision testing stage, comprising: The installation is judged to be qualified based on the eccentricity of the measured angle sensor during installation and the preset eccentricity threshold. Based on the judgment result of unqualified installation, the horizontal position of the tooling fixture is adjusted according to the theoretical adjustment step size until the installation is qualified. Based on the installation qualification result, the theoretical adjustment step size or the judgment output room temperature performance index and the first test completion signal are adjusted according to the measured noise coupling ratio and the preset ratio threshold. The measured noise coupling ratio is determined based on the eccentricity, the acquired turntable speed and the output angle value of the angle sensor. Based on the first test completion signal, the temperature stability index of the angle sensor and the second test completion signal are determined according to the static zero angle value of the angle sensor and each preset test temperature obtained during the independent temperature chamber test. Based on the second test completion signal, adjust the preset fan speed or determine the output high and low temperature performance index and the third test completion signal according to the output angle value and the relevant characteristics of the thermal deformation between the temperature chamber and the turntable when the temperature chamber is running at the preset fan speed, the output angle value and the relevant characteristics of the multi-point temperature fluctuation value in the temperature chamber. Based on the third test completion signal, a test report is output according to the room temperature performance index, the temperature stability index, and the high and low temperature performance index; The preset ratio threshold is adjusted based on the room temperature performance index, the high and low temperature performance index, the temperature stability index, and the frequency of adjusting the theoretical adjustment step size within the preset test rounds.

[0007] Furthermore, the process of adjusting the step size to adjust the horizontal position of the tooling fixture until the installation is qualified includes: The determination of installation failure is based on the comparison between the eccentricity and the preset eccentricity threshold, and the offset azimuth angle is recorded. Based on the determination of installation failure, the adjustment vector is determined according to the eccentricity vector, the theoretical adjustment step size, and the eccentricity. The eccentricity vector is determined based on the eccentricity and the offset azimuth angle, and the theoretical adjustment step size is determined based on the eccentricity and the preset eccentricity threshold. Adjust the tooling fixture to a horizontal position according to the adjustment vector until the installation is qualified, so as to obtain the installation qualification result.

[0008] Furthermore, the process of adjusting the theoretical adjustment step size or determining the output room temperature performance index and the first test completion signal includes: The measured noise coupling ratio is determined based on the fluctuation characteristics of the output angle value and the coupling drift angle, wherein the coupling drift angle is determined based on the turntable rotation speed and the eccentricity. Based on the comparison results of the measured noise coupling ratio being less than the preset ratio threshold, the cause of the anomaly is determined to be eccentricity-dominated, and the preset deviation coefficient is increased according to the measured noise coupling ratio and the preset ratio threshold. Based on the comparison result that the measured noise coupling ratio is greater than or equal to the preset ratio threshold, the turntable servo is determined to be abnormal according to the angle output fluctuation value, or the room temperature performance index is determined according to the angle output fluctuation value, and the first test completion signal is output.

[0009] Furthermore, the process of determining a turntable servo malfunction based on the angle output fluctuation value or determining the room temperature performance index based on the angle output fluctuation value and outputting the first test completion signal includes: Based on the comparison result that the angle output fluctuation value is less than or equal to the preset speed threshold, the room temperature performance index is determined according to the angle output fluctuation value and the preset speed threshold, and the first test completion signal is output. Based on the comparison result that the angle output fluctuation value is greater than the preset speed threshold, the turntable servo is determined to be abnormal and the proportional gain coefficient of the turntable servo driver is adjusted.

[0010] Furthermore, the process of determining the temperature stability index of the angle sensor and the second test completion signal based on the static zero-point angle value and each preset test temperature includes: The temperature stability index of the angle sensor and the second test completion signal are determined based on the first and second temperature sensitivity coefficients, wherein... The first temperature sensitivity coefficient is determined based on the first zero-point mean, the second zero-point mean, and the first temperature change, wherein, The first zero-point mean is determined based on the static zero-point angle value at the first preset test temperature within the preset monitoring period; The second zero-point mean is determined based on the static zero-point angle value at the second preset test temperature within the preset monitoring period; The first temperature change is determined based on the first preset test temperature and the second preset test temperature; The second temperature sensitivity coefficient is determined based on the second zero-point mean, the third zero-point mean, and the second temperature change, wherein, The third zero-point average value is determined based on the static zero-point angle value at the third preset test temperature within the preset monitoring period. The second temperature change is determined based on the second and third preset test temperatures.

[0011] Furthermore, the process of determining the temperature stability index of the angle sensor and the second test completion signal based on the first temperature sensitivity coefficient and the second temperature sensitivity coefficient includes: A comprehensive temperature sensitivity coefficient is determined based on the first temperature sensitivity coefficient and the second temperature sensitivity coefficient. Based on the threshold comparison result of the comprehensive temperature sensitivity coefficient, it is determined whether the stability of the angle sensor is qualified, and based on the determination result of whether the stability of the angle sensor is qualified, the temperature stability index and the second test completion signal are determined and output.

[0012] Furthermore, the process of adjusting the preset fan speed or determining the output of the high and low temperature performance indicators and the third test completion signal based on the correlation characteristics of the output angle value and the thermal deformation amount during the high and low temperature test, and the correlation characteristics of the output angle value and the multi-point temperature fluctuation value, includes: The preset fan speed is adjusted based on the speed variation correlation and temperature variation correlation, or the high and low temperature performance indicators and the third test completion signal are output based on the angle range. The variable speed correlation is determined based on the correlation characteristics of the output angle value and the thermal deformation at each temperature during the high and low temperature test. Temperature change correlation is determined based on the correlation characteristics of the output angle value and the multi-point temperature fluctuation value at each temperature during the high and low temperature test. The angle range is determined based on the output angle value during the high and low temperature test.

[0013] Furthermore, the process of adjusting the preset fan speed or determining the high and low temperature performance indicators and the third test completion signal based on the speed change correlation and the temperature change correlation includes: Based on the comparison results that the speed change correlation is less than the preset first correlation threshold and the temperature change correlation is greater than the preset second correlation threshold, it is determined that the difference between high and low temperature output is caused by uneven temperature field. The preset fan speed is adjusted according to the preset adjustment step size and the high and low temperature test is re-executed. Based on the comparison results of the speed change correlation being less than a preset first correlation threshold and the temperature change correlation being less than or equal to a preset second correlation threshold, high and low temperature performance indicators and a third test completion signal are determined and output according to the angle range and the preset extreme value threshold.

[0014] Furthermore, the process of adjusting the preset ratio threshold based on the room temperature performance index, the high and low temperature performance index, the temperature stability index, and the frequency of adjusting the theoretical adjustment step size within the preset test rounds includes: Based on the threshold comparison results of the corrected confidence level, the preset ratio threshold is adjusted according to the degree of deviation of the corrected confidence level, wherein, The confidence level is adjusted based on the confidence mean and the frequency of adjusting the theoretical adjustment step size; The confidence mean is determined based on the room temperature performance index, the high and low temperature performance index, and the temperature stability index of the angle sensor within the preset test rounds.

[0015] On the other hand, the present invention also provides a multifunctional high and low temperature precision testing stage, comprising: The main body of the test bench is equipped with a tooling fixture for fixing the angle sensor under test and adjusting its horizontal position, a turntable for driving the angle sensor under test to rotate, a temperature chamber for providing a closed temperature field and applying a programmable temperature environment, a transverse movement device for driving the temperature chamber to move laterally along the guide rail, and a control module for executing and controlling the test process. The control module includes a data acquisition unit, an installation and adjustment unit, a room temperature determination unit, a stability determination unit, a thermal field determination unit, an output unit, and an adjustment unit. The acquisition unit is used to acquire the eccentricity of the angle sensor under test during installation, the turntable rotation speed, the output angle value of the angle sensor under test, the static zero-point angle value, and the thermal deformation between the temperature chamber and the turntable when the temperature sensor is running at a preset fan speed. The installation adjustment unit is used to determine whether the installation is qualified based on the eccentricity and the preset eccentricity threshold. Based on the determination that the installation is not qualified, the horizontal position of the tooling fixture is adjusted according to the theoretical adjustment step size until the installation is qualified. The room temperature determination unit is used to adjust the theoretical adjustment step size or determine the room temperature performance index and the first test completion signal based on the determination result of qualified installation, according to the measured noise coupling ratio and the preset ratio threshold. The measured noise coupling ratio is determined based on the eccentricity, the turntable speed and the output angle value. The stability determination unit is used to determine the temperature stability index of the angle sensor and the second test completion signal based on the first test completion signal, the static zero-point angle value during the independent temperature chamber test and each of the preset test temperatures. The thermal field determination unit is used to adjust the preset fan speed or determine the output high and low temperature performance index and the third test completion signal based on the second test completion signal, according to the relevant characteristics of the output angle value and the thermal deformation during the high and low temperature test, and the relevant characteristics of the output angle value and the multi-point temperature fluctuation value in the temperature chamber. The output unit is used to output a test report based on the room temperature performance index, the temperature stability index, and the high and low temperature performance index. The adjustment unit is used to adjust the preset ratio threshold according to the room temperature performance index, the high and low temperature performance index, the temperature stability index and the frequency of adjusting the theoretical adjustment step size within a preset test cycle.

[0016] Compared with existing technologies, the advantages of this invention are that by integrating three functional modes onto the same platform through a transverse movement device, the testing fragmentation caused by repeated handling of multiple devices can be eliminated. The threshold comparison of the measured noise coupling ratio in the independent turntable mode can decouple installation eccentricity and turntable servo anomalies step by step, preventing installation problems from being misjudged as intrinsic performance issues of the angle sensor. Through correlation analysis of the output angle value with thermal deformation and multi-point temperature fluctuation values ​​in the high and low temperature combination mode, it is possible to distinguish between thermal deformation or temperature field inhomogeneity as the dominant factors and suppress them accordingly, preventing environmental factors from contaminating the temperature response evaluation. Simultaneously, in the independent temperature chamber mode, the drift rate of the static zero-point angle value with temperature points is directly extracted as a temperature stability index, compensating for the lack of a quantitative error tracing mechanism. Furthermore, by dynamically correcting the discrimination threshold through multiple rounds of statistical features, the judgment boundary adapts to batch products, ensuring a high defect interception rate while reducing the frequency of false alarms. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the multifunctional high and low temperature precision test bench in this embodiment; Figure 2 This is a flowchart illustrating the working method of the multifunctional high and low temperature precision test bench in this embodiment; Figure 3 This is the logic diagram for determining installation failure in this embodiment; Figure 4 This is the logic diagram for determining the cause of the anomaly in this embodiment as being dominated by eccentricity. Detailed Implementation

[0018] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0019] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0020] Please see Figure 1 This is a structural diagram of the multifunctional high and low temperature precision test bench in this embodiment. In this embodiment, the multifunctional high and low temperature precision test bench and its working method are applied to the production testing of angle sensors. The high and low temperature test bench consists of a test bench body 1 and a control module 4. The test bench body 1 includes a horizontally movable temperature chamber 2, an independent high-precision turntable, a horizontal movement device, and matching tooling fixtures. The temperature chamber 2 is completely moved away from the high and low temperature test position of the built-in precision turntable by the horizontal movement device 3, and moves horizontally to the right to the high and low temperature test position without the turntable. At this time, the high and low temperature test position of the built-in precision turntable is displayed in an open area, which can be conveniently placed and debugged with the tooling fixtures and angle sensors to be tested. After installation, the temperature chamber is moved to the test area, and after the temperature chamber is fixed, the test can be carried out. The entire test process is achieved by switching between three functional modes: temperature chamber 2 and turntable, independent turntable, and independent temperature chamber, based on the test completion signals of each stage through the horizontal movement device. In addition, the temperature chamber 2 is supplied with refrigerant by an external compressor through a hose, so as to avoid the vibration and noise generated by the compressor during operation from affecting the product test results or causing discomfort to the operator.

[0021] Please see Figure 2 The diagram shows a flowchart of the working method of the multifunctional high and low temperature precision test station in this embodiment. In this embodiment, one aspect is that a working method of the multifunctional high and low temperature precision test station is provided, including: Step S1: Determine whether the installation is qualified based on the obtained eccentricity of the measured angle sensor during installation and the preset eccentricity threshold. Based on the determination result of unqualified installation, adjust the horizontal position of the tooling fixture according to the theoretical adjustment step length until the installation is qualified.

[0022] In this embodiment, the eccentricity is obtained by fixing the angle sensor fixture on the turntable and using a laser displacement sensor or a high-precision dial indicator to measure and calculate half of the runout of the outer circle of the fixture when the turntable rotates one revolution, so as to determine the degree of spatial offset between the mounting axis of the angle sensor and the rotation axis of the turntable.

[0023] In this embodiment, the preset eccentricity threshold is determined based on the constraint that the installation adjustment misjudgment rate is within an acceptable range and the false signal caused by eccentricity is lower than the system's inherent noise level. This determines the maximum allowable eccentricity that balances installation alignment efficiency and testing accuracy. If the preset eccentricity threshold is set too small, the normal installation state can easily be misjudged as unqualified due to the influence of turntable vibration, tooling processing errors, and random measurement errors, thus increasing the number of repeated adjustments and reducing testing efficiency. If the preset eccentricity threshold is set too large, the coupling error caused by eccentricity will significantly affect the angle sensor output, causing installation errors to enter the subsequent performance testing process and reducing the authenticity of the test results. Therefore, this embodiment comprehensively determines the preset eccentricity threshold based on equipment installation accuracy, measurement noise level, and allowable testing error, ensuring that installation errors do not become the main source of error in subsequent performance evaluation while maintaining installation adjustment efficiency.

[0024] In this embodiment, the theoretical adjustment step size is determined based on the eccentricity and the preset eccentricity threshold to characterize the displacement of a single adjustment.

[0025] Step S2: Based on the installation qualification result, adjust the theoretical step size or determine the output room temperature performance index and the first test completion signal according to the measured noise coupling ratio and the preset ratio threshold. In this embodiment, the measured noise coupling ratio is determined based on the eccentricity, the acquired turntable rotation speed, and the output angle value of the angle sensor. In this embodiment, the rotational speed of the turntable is measured in real time by an encoder or grating ruler built into the turntable to reflect the magnitude of the angular velocity of the turntable rotation.

[0026] In this embodiment, the output angle value is obtained by converting the detected angular velocity into an electrical signal through the internal sensitive structure of the angle sensor. After analog-to-digital conversion and scaling factor calibration, the signal is output through a serial communication interface such as SPI, I²C or RS-422, etc., to reflect the actual angular velocity measurement value output by the angle sensor in the rotation state.

[0027] In this embodiment, the preset ratio threshold is determined based on the noise coupling ratio distribution characteristics of normal and eccentric samples during independent turntable testing, to ensure that eccentric dominant interference can be effectively distinguished from normal noise fluctuations. If the preset ratio threshold is set too low, normal noise may be misjudged as eccentric interference, increasing the number of installation adjustments. If the preset ratio threshold is set too high, abnormal output caused by eccentricity is difficult to identify in a timely manner, reducing the effectiveness of installation error screening. Therefore, this embodiment sets the preset ratio threshold within the transition range between normal noise distribution and eccentric interference distribution, ensuring that subsequent testing is based on effective control of installation errors, while also considering testing efficiency and judgment accuracy.

[0028] Step S3: Based on the first test completion signal, determine the temperature stability index of the angle sensor and the second test completion signal according to the static zero-point angle value of the angle sensor and each preset test temperature obtained during the independent temperature chamber test.

[0029] In this embodiment, the static zero-point angle value is either the voltage value or the equivalent angle value after scaling factor conversion. In independent temperature chamber mode, it is obtained by continuously collecting data for at least 60 seconds using an analog-to-digital converter at a sampling frequency of not less than 1Hz and taking the average value.

[0030] In this embodiment, the preset test temperature is determined comprehensively based on the operating temperature range of the angle sensor, the stable temperature control range of the temperature chamber, and the temperature drift characteristics to ensure that the test temperature covers the low-temperature range, the normal-temperature range, and the high-temperature range. When the test temperature is too close to the boundary of the operating temperature range, the temperature control error of the temperature chamber is prone to increase, affecting the accuracy of zero-point drift measurement; when the test temperature coverage is insufficient, it is difficult to reflect the temperature drift characteristics of the angle sensor in the entire temperature range. Therefore, this embodiment selects multiple representative temperature points located in the low-temperature range, the normal-temperature range, and the high-temperature range for testing, so that each temperature range is representative, while taking into account both temperature control stability and full-temperature range coverage.

[0031] Step S4: Based on the second test completion signal, adjust the preset fan speed or determine the output high and low temperature performance index and the third test completion signal according to the output angle value during the high and low temperature test and the relevant characteristics of the thermal deformation between the temperature chamber and the turntable at the preset fan speed, the output angle value and the relevant characteristics of the multi-point temperature fluctuation value in the temperature chamber.

[0032] In this embodiment, the thermal deformation is obtained by continuously collecting displacement signals using an eddy current or laser displacement sensor in a high and low temperature cycle test using a combination of a temperature chamber and a turntable, and then averaging the readings in each temperature range at 10°C intervals.

[0033] In this embodiment, the multi-point temperature fluctuation value is obtained by setting five points in the four corners and the center of the working area of ​​the temperature chamber, which are located near the front, rear, left, right and the center of the height direction directly above the turntable. The temperature is continuously monitored by arranging at least five platinum resistance temperature sensors in the working area of ​​the temperature chamber, and then the average of the standard deviation of all sensor readings in each temperature interval is taken at a temperature interval of 10°C.

[0034] In this embodiment, the preset fan speed is determined comprehensively based on the air circulation capacity of the temperature chamber, the uniformity of the temperature field, and the operating energy consumption. When the preset fan speed is too low, the air circulation efficiency is insufficient, and local temperature differences are easily formed within the temperature chamber, affecting the consistency of the test results. When the preset fan speed is too high, further increasing the speed has limited effect on improving the uniformity of the temperature field, but instead increases the energy consumption of the equipment and airflow disturbance. Therefore, this embodiment selects the operating range with sufficient temperature field uniformity and low energy consumption as the initial speed, and dynamically adjusts it according to the temperature field state during subsequent tests.

[0035] Step S5: Based on the third test completion signal, output a test report according to the room temperature performance index, temperature stability index, and high and low temperature performance index. Step S6: Adjust the preset ratio threshold according to the room temperature performance index, high and low temperature performance index, temperature stability index and the frequency of adjusting the theoretical adjustment step size within the preset test rounds.

[0036] In this embodiment, the preset number of test rounds is determined comprehensively based on the statistical stability of historical test data and the update cycle of process changes. This ensures that the historical data used to calculate the corrected confidence level is both sufficiently representative and can reflect the current production status in a timely manner. If the preset number of test rounds is too small, the corrected confidence level is easily affected by random fluctuations, leading to frequent adjustments to the judgment threshold. If the preset number of test rounds is too large, the proportion of historical data becomes too high, reducing the response speed of the judgment threshold to process changes and affecting the accuracy of subsequent test results. Therefore, this embodiment determines the preset number of test rounds comprehensively based on statistical stability and the process update cycle, ensuring that the dynamically corrected judgment threshold possesses both stability and real-time performance.

[0037] Integrating three functional modes onto a single platform via a traversing device eliminates testing fragmentation caused by repeated handling of multiple devices. Threshold comparison of the measured noise coupling ratio in independent turntable mode decouples installation eccentricity from turntable servo anomalies step-by-step, preventing installation issues from being misjudged as inherent performance problems of the angle sensor. Correlation analysis of output angle values ​​with thermal deformation and multi-point temperature fluctuations in high and low temperature combination modes distinguishes between thermal deformation and temperature field inhomogeneity as the primary factors, allowing for their suppression and preventing environmental factors from contaminating temperature response evaluation. Furthermore, in independent temperature chamber mode, the drift rate of the static zero-point angle value with temperature points is directly extracted as a temperature stability indicator, compensating for the lack of a quantitative error tracing mechanism. In addition, dynamic correction of the discrimination threshold through multiple rounds of statistical features allows the judgment boundary to adapt to batch products, ensuring a high defect interception rate while reducing false alarm frequency.

[0038] Please see Figure 3 As shown, this is the logic diagram for determining installation failure in this embodiment. In this embodiment, the process of adjusting the horizontal position of the tooling fixture to achieve installation qualification includes: The determination of installation failure is based on the fact that the eccentricity is greater than the preset eccentricity threshold, and the offset azimuth angle is recorded to characterize the deviation direction of the current installation state that exceeds the allowable range. Based on the judgment result of installation failure, the product of the eccentricity vector and the theoretical adjustment step length and the ratio of the eccentricity are calculated to obtain the adjustment vector characterizing the direction and distance of the horizontal movement of the tooling fixture.

[0039] In this embodiment, the eccentricity vector is determined based on the eccentricity and the offset azimuth angle to characterize the direction and magnitude of the eccentricity in the horizontal coordinate system. The theoretical adjustment step size is determined based on the degree of deviation between the eccentricity and the preset eccentricity threshold, as well as the preset deviation coefficient, to determine the target displacement of a single installation adjustment. The preset deviation coefficient is determined comprehensively based on the convergence speed and adjustment stability of the closed-loop installation adjustment process to characterize the proportional relationship between the theoretical adjustment step size and the deviation. When the preset deviation coefficient is too small, the single adjustment amount is insufficient, requiring multiple iterations to meet the installation requirements, reducing installation efficiency. When the preset deviation coefficient is too large, the single adjustment amount is too large, easily leading to over-adjustment or oscillation, affecting installation accuracy and closed-loop adjustment stability. Therefore, this embodiment selects a proportional range that ensures rapid convergence of the closed-loop adjustment and avoids over-adjustment, enabling the installation error to converge to within the preset eccentricity threshold within a fewer adjustment cycles.

[0040] Adjust the tooling fixture to a horizontal position according to the adjustment vector until the installation is qualified, so as to obtain the installation qualification result.

[0041] In this embodiment, the eccentricity is remeasured and iteratively calculated after each adjustment until the eccentricity does not exceed the preset threshold. The maximum number of iterations is five. If the limit is exceeded, an alarm is triggered to prompt manual intervention. After intervention, the iteration counter is reset and the test is retried. The maximum number of manual interventions is two. If the test is still unqualified after two interventions, the test is terminated and the fault code is recorded.

[0042] By fully exposing the installation station to an open area, the installation deviation can be quantified into an eccentricity vector with a directional component. The theoretical movement distance required for a single adjustment can be calculated based on the degree of deviation of the eccentricity from the preset eccentricity threshold. This enables the tooling fixture to perform vectorized step compensation in the opposite direction of the deviation, transforming the installation alignment from a qualitative operation relying on manual observation and repeated trial and error into precise displacement control driven by measured data. The iterative process can reduce the eccentricity and avoid overshoot oscillation, improving installation efficiency and alignment consistency.

[0043] Please see Figure 4 As shown, this is the logic diagram for determining that the cause of the anomaly is eccentricity-dominated in this embodiment. In this embodiment, the process of adjusting the theoretical adjustment step size or determining the output room temperature performance index and the first test completion signal includes: The ratio of the calculated angular output fluctuation value to the sum of the coupling drift angle and the fractional part (excluding zero) is used to obtain the measured noise coupling ratio.

[0044] In this embodiment, the angle output fluctuation value is determined based on the standard deviation of the output angle value within the previous preset test duration, so as to characterize the short-term fluctuation of the output angle value.

[0045] In this embodiment, the preset test duration is determined based on the constraints of meeting noise statistical stability requirements and maintaining a high level of test efficiency, thus characterizing the sampling time window that balances noise estimation reliability and test cycle time. If the test duration is too short, the noise statistical results are easily affected by random fluctuations, leading to a decrease in the reliability of the noise coupling ratio determination; if the test duration is too long, the improvement in noise statistical stability tends to saturate, while the test cycle continues to increase, reducing batch testing efficiency. Therefore, by analyzing the correspondence between test duration and noise statistical stability, and combining it with test efficiency requirements, a preset test duration that satisfies both noise statistical reliability and optimal test efficiency is determined. In this embodiment, the coupling drift angle is determined based on the product of the square of the current turntable rotation speed, the eccentricity, and the preset coupling coefficient, to determine the spurious angular velocity output caused by eccentricity.

[0046] In this embodiment, the preset coupling coefficient is determined based on the fit consistency between the eccentric motion theoretical model and the actual test data, to characterize the proportional relationship between the influence of eccentricity and spurious angular velocity. If the preset coupling coefficient is too small, the theoretical model's characterization of the eccentricity effect is insufficient, leading to an underestimation of the eccentricity contribution; if the preset coupling coefficient is too large, the theoretical model's characterization of the eccentricity effect is enhanced, leading to an overestimation of the eccentricity contribution. Therefore, by comprehensively analyzing the fit consistency between the theoretical model and the actual test results, a preset coupling coefficient is determined that allows the theoretical prediction results to truly reflect the eccentricity effect.

[0047] When the measured noise coupling ratio is less than the preset ratio threshold, the cause of the abnormality is determined to be eccentricity, and the process returns to the installation stage. The preset deviation coefficient is increased proportionally to the relative deviation between the measured noise coupling ratio and the preset ratio threshold in order to accelerate the convergence speed of subsequent installation adjustments. When the measured noise coupling ratio is greater than or equal to the preset ratio threshold, the turntable servo is judged to be abnormal based on the angle output fluctuation value, or the room temperature performance index is determined based on the angle output fluctuation value, and the first test completion signal is output to characterize the passability of the room temperature dynamic performance.

[0048] Specifically, the process of determining a turntable servo malfunction based on the angle output fluctuation value or determining the room temperature performance index based on the angle output fluctuation value and outputting the first test completion signal includes: When the angle output fluctuation value is less than or equal to the preset speed threshold, the room temperature performance index and the first test completion signal are determined and output in an exponential decay form according to the degree of deviation between the angle output fluctuation value and the preset speed threshold.

[0049] In this embodiment, the preset speed threshold is determined according to the dual constraints of the recognition accuracy of normal fluctuations and the detection ability of servo anomalies, so as to characterize the demarcation threshold between normal fluctuations and abnormal fluctuations. When the preset speed threshold is too low, normal noise fluctuations are easily misjudged as servo anomalies, resulting in unnecessary parameter adjustments; when the preset speed threshold is too high, the fluctuations caused by servo anomalies are difficult to detect in time, affecting the subsequent test accuracy. Therefore, by comprehensively analyzing the statistical distribution laws of normal fluctuations and abnormal fluctuations, a preset speed threshold that can balance the recognition accuracy of the normal state and the detection ability of anomalies is determined.

[0050] When the angle output fluctuation value is greater than the preset speed threshold, it is determined that the turntable servo is abnormal, and the proportional gain coefficient of the turntable servo driver is reduced according to the preset step size, so as to suppress the instability of the turntable drive and reduce the angle output fluctuation value.

[0051] In this embodiment, the preset step size is determined according to the balance between the convergence speed of the turntable servo system and the control stability, so as to determine the gain adjustment range that takes into account both rapid adjustment and stable control. When the preset step size is too small, the proportional gain adjustment speed is slow, resulting in a decrease in the convergence efficiency of control parameters; when the preset step size is too large, the proportional gain adjustment is likely to exceed the stable range of the system, causing overshoot or oscillation, affecting the stability of the test results. Therefore, by comprehensively analyzing the influence of different adjustment step sizes on the system dynamic response, a preset step size that can balance the adjustment efficiency and control stability is determined.

[0052] In this embodiment, after each reduction of the proportional gain coefficient of the turntable servo driver, a retest is performed, and the maximum number of adjustments is three times; if the angle output fluctuation value drops below the preset speed threshold within three times, it is determined that the normal temperature performance is qualified and a signal is output. If it still does not meet the requirement after more than three times, an alarm is given to indicate an irreparable fault, and the operator is allowed to choose to terminate the test and mark the abnormal product, or to manually repair and then choose to retest. When retesting, the adjustment times counter is reset and the initial gain coefficient is restored, and the maximum number of retests is two times; after more than two times, the test is forced to terminate and an irrecoverable fault is recorded.

[0053] By comparing the ratio of the measured output angle value fluctuation value to the theoretical coupling drift angle with the preset threshold, it is possible to distinguish whether the fluctuation source is installation eccentricity or turntable servo anomaly, thus avoiding misjudging eccentricity as an intrinsic defect of the angle sensor. Decoupling installation eccentricity, turntable servo and the intrinsic noise of the angle sensor step by step can reduce the repeatability and misjudgment risk caused by source confusion. By mapping the fluctuation deviation in the form of exponential decay into a continuous performance index, slowly decaying when not exceeding the limit to retain performance margin, and quickly returning to zero when exceeding the limit to give a clear deterioration indication, it is possible to achieve smooth gradual differentiation within the qualified range and quickly punish abnormal fluctuations.

[0054] Specifically, the process of determining the temperature stability index of the angle sensor and the second test completion signal based on the static zero-point angle value and each preset test temperature includes: The temperature stability index of the angle sensor and the second test completion signal are determined based on the first temperature sensitivity coefficient and the second temperature sensitivity coefficient.

[0055] In this embodiment, the first temperature sensitivity coefficient is based on the ratio of the absolute value of the difference between the first zero mean and the second zero mean to the first temperature change. The first zero mean is determined based on the arithmetic mean of the static zero angle values ​​at the first preset test temperature within a preset monitoring period.

[0056] In this embodiment, the preset monitoring duration is determined based on the balance between static zero-point noise suppression effect and testing efficiency, representing a sampling duration that balances noise stability and detection cycle time. If the monitoring duration is too short, random noise has not been sufficiently averaged, leading to insufficient stability in the sensitivity coefficient calculation; if the monitoring duration is too long, the noise suppression effect improves more slowly, while the overall testing cycle increases significantly, which is detrimental to batch testing efficiency. By analyzing the decay law of static noise with integration time, the monitoring duration is determined to correspond to the integration interval where noise decreases and tends to stabilize while testing efficiency remains at a high level, thereby ensuring sufficient suppression of random noise and avoiding unnecessary extension of testing time.

[0057] In this embodiment, the second zero-point average is based on the arithmetic mean of the static zero-point angle values ​​under the second preset test temperature within a preset monitoring period to determine the stable zero point of the intermediate temperature point; the first temperature change is determined based on the absolute value of the difference between the first preset test temperature and the second preset test temperature.

[0058] In this embodiment, the second temperature sensitivity coefficient is determined based on the ratio of the absolute value of the difference between the second zero-point mean and the third zero-point mean to the second temperature change. The third zero-point mean is based on the arithmetic mean of the static zero-point angle values ​​at the third preset test temperature within a preset monitoring period, to characterize the stable zero point of the high-temperature point. The second temperature change is determined based on the absolute value of the difference between the second preset test temperature and the third preset test temperature, to characterize the temperature difference between the intermediate and high-temperature points.

[0059] Specifically, the process of determining the temperature stability index of the angle sensor and the second test completion signal based on the first temperature sensitivity coefficient and the second temperature sensitivity coefficient includes: When the overall temperature sensitivity coefficient is less than the preset sensitivity threshold, the angle sensor is deemed to be stable and qualified. The ratio of the overall temperature sensitivity coefficient to the preset sensitivity threshold is used as the exponent of the exponential decay. The natural exponential function value is calculated to determine and output the temperature stability index and the second test completion signal. When the overall temperature sensitivity coefficient is greater than or equal to the preset sensitivity threshold, the angle sensor is deemed to be unqualified and the temperature stability index is set to the preset limit. The temperature stability index and the second test completion signal are then output. In this embodiment, the comprehensive temperature sensitivity coefficient is the maximum value between the first temperature sensitivity coefficient and the second temperature sensitivity coefficient.

[0060] In this embodiment, the preset sensitivity threshold is determined based on the actual testing patterns of normal and abnormal temperature drift to establish a temperature sensitivity judgment boundary that balances false positive and false negative rates. If the preset sensitivity threshold is too low, normal testing fluctuations can easily trigger abnormal judgments, affecting testing efficiency; if the preset sensitivity threshold is too high, abnormal temperature drifts are difficult to identify in a timely manner, reducing quality screening capabilities. By analyzing the distribution patterns of temperature sensitivity coefficients for normal and abnormal samples, a judgment boundary with strong distinguishing ability between the two types of samples is determined, ensuring a high pass rate for normal products while guaranteeing that abnormal products can be effectively identified.

[0061] In this embodiment, the preset limit is calculated based on the exponential result of the qualified index range from zero to one. The unqualified flag is set as a single value outside the range. In this embodiment, it is set to 0. This value does not overlap with the qualified range, so that the contribution of this item in the comprehensive confidence calculation is zero, and the unqualified state is clearly identified.

[0062] By calculating the local temperature sensitivity coefficients of the low-temperature and high-temperature ranges separately and selecting the maximum value of both to capture the worst drift conditions across the entire temperature range, we can avoid the overall averaging from masking the performance shortcomings of a single temperature zone. When the maximum value is lower than the preset sensitivity threshold, it is mapped to a continuous performance index between zero and one using an exponential decay method. This allows for a smooth transition at the acceptable boundary and a rapid zeroing penalty for excessive fluctuations. When the maximum value is higher than or equal to the threshold, the index is directly assigned to zero. This enables non-compliant samples to contribute zero in subsequent comprehensive evaluations and clearly marks defects, thus transforming the temperature stability assessment of angle sensors from an empirical qualitative process into a statistically objective quantitative process.

[0063] Specifically, the process of adjusting the preset fan speed or determining the output high and low temperature performance indicators and the third test completion signal based on the output angle value and the relevant characteristics of the thermal deformation between the temperature chamber and the turntable at the preset fan speed during the high and low temperature test, and the relevant characteristics of the output angle value and the multi-point temperature fluctuation values ​​within the temperature chamber, includes: Adjust the preset fan speed based on the speed variation correlation and temperature variation correlation, or determine the high and low temperature performance indicators and the third test completion signal based on the angle range.

[0064] In this embodiment, the variable speed correlation is determined based on the Pearson correlation coefficient of the output angle value and thermal deformation at each temperature during the high and low temperature test, so as to characterize the degree of linear correlation between the change in output angle value and the thermal deformation.

[0065] In this embodiment, the temperature change correlation is determined based on the Pearson correlation coefficient of the output angle value and the multi-point temperature fluctuation value at each temperature during the high and low temperature test, so as to characterize the degree of linear correlation between the change of output angle value and the non-uniformity of the temperature field.

[0066] In this embodiment, the angle range is determined based on the absolute value of the difference between the output angle value corresponding to the lowest temperature and the output angle value corresponding to the highest temperature during the high and low temperature test, so as to characterize the total drift of the output angle value of the angle sensor in the entire temperature range.

[0067] Specifically, the process of adjusting the preset fan speed based on the speed variation correlation and temperature variation correlation, or determining the high and low temperature performance indicators and the third test completion signal based on the angle range, includes: When the speed change correlation is less than the preset first correlation threshold and the temperature change correlation is greater than the preset second correlation threshold, it is determined that the difference between high and low temperature output is caused by uneven temperature field. The preset fan speed is increased by adjusting the step size according to the preset and the high and low temperature test is re-executed.

[0068] In this embodiment, the preset first correlation threshold is determined based on the actual test patterns of the correlation between the output angle value and the amount of thermal deformation, to define the judgment boundary between thermal deformation-dominated drift and random fluctuations. If the preset first correlation threshold is too low, random fluctuations are easily misjudged as thermal deformation effects, increasing the probability of misjudgment; if the preset first correlation threshold is too high, output drift caused by thermal deformation is difficult to identify in a timely manner, increasing the probability of missed judgment. By analyzing the distribution patterns of the correlation coefficients between normal samples and thermally deformed samples, a correlation judgment boundary that balances the misjudgment rate and the missed judgment rate is determined to ensure that the influence of thermal deformation can be accurately identified while avoiding misjudgments caused by random fluctuations.

[0069] In this embodiment, the preset second correlation threshold is determined based on the changing relationship between temperature field uniformity and output angle value, thus defining the boundary between a uniform and non-uniform temperature field. If the preset second correlation threshold is too low, normal temperature field fluctuations are easily misjudged as non-uniform temperature field, affecting test stability; if the preset second correlation threshold is too high, output anomalies caused by non-uniform temperature field are difficult to identify in a timely manner, reducing anomaly detection capability. By analyzing the correlation characteristics between output angle value and temperature distribution under different temperature field states, a correlation boundary that can effectively distinguish between normal and abnormal temperature fields is determined, thereby improving the accuracy of temperature field anomaly identification.

[0070] In this embodiment, the preset adjustment step size is determined based on the balance between the efficiency of improving temperature field uniformity and the stability of fan operation, to determine the fan speed adjustment range that balances adjustment efficiency and operational stability. If the preset adjustment step size is too small, the improvement of temperature field uniformity is slow, requiring multiple adjustments to reach the target state, reducing testing efficiency; if the preset adjustment step size is too large, the fan speed changes too quickly, easily causing airflow disturbance and temperature field fluctuations, affecting the system's operational stability. By analyzing the temperature field uniformity improvement trend corresponding to different speed adjustment ranges, the adjustment range corresponding to the stable improvement effect of temperature field uniformity and the stable operation of the system is determined, thereby reducing the number of adjustments and ensuring the stability of the temperature field adjustment process.

[0071] When the speed variation correlation is less than the preset first correlation threshold and the temperature variation correlation is less than or equal to the preset second correlation threshold, the natural exponential function value is calculated based on the ratio of the angle range to the preset extreme value threshold as the exponential decay index, so as to obtain the high and low temperature performance index and the third test completion signal are output.

[0072] In this embodiment, the preset extreme value threshold is determined comprehensively based on the range of output angle range variation and performance evaluation sensitivity to establish a normalization benchmark for the natural index mapping. If the preset extreme value threshold is too small, the performance indicators are overly sensitive to normal fluctuations, resulting in an overly dispersed indicator distribution; if the preset extreme value threshold is too large, the performance indicators' ability to distinguish abnormal fluctuations decreases, causing the indicators of different performance products to tend to converge. By analyzing the performance indicator distribution patterns corresponding to different extreme value thresholds, a mapping benchmark that balances indicator resolution and evaluation stability is determined, enabling high and low temperature performance indicators to effectively distinguish between normal and abnormal output fluctuations.

[0073] By calculating the linear correlation between the output angle value and thermal deformation, and between the output angle value and multi-point temperature fluctuation value, the root cause of drift is precisely decoupled by utilizing the physical independence of the two interference sources. When the temperature field is non-uniform, the fan speed can be automatically increased to physically eliminate environmental disturbances. After both interferences are suppressed, the range of the output angle value across the entire temperature range is mapped to a continuous performance index through exponential decay. This allows small drifts to retain performance margins while excessive drifts are quickly penalized. The evaluation of high and low temperature dynamic performance is upgraded from a qualitative binary qualification judgment to a quantifiable continuous index, preventing environmental factors from contaminating the temperature response evaluation of the angle sensor itself.

[0074] Specifically, the process of adjusting the preset ratio threshold based on the room temperature performance index, high and low temperature performance index, temperature stability index, and the frequency of adjusting the theoretical adjustment step size within the preset test rounds includes: When the corrected confidence level is less than or equal to the preset confidence threshold, the preset ratio threshold is increased proportionally to the relative deviation between the corrected confidence level and the preset confidence threshold.

[0075] In this embodiment, the corrected confidence level is determined based on the product of the confidence mean and the frequency factor, in order to characterize the overall performance level of the batch after the installation adjustment frequency correction.

[0076] In this embodiment, the confidence mean is determined based on the average of the geometric mean of the room temperature performance index, high and low temperature performance index, and temperature stability index of the angle sensor within a preset test cycle, so as to characterize the overall average performance level of the current batch of angle sensors.

[0077] In this embodiment, the frequency factor is determined based on the complement of the relative deviation between the frequency of the adjustment step size and the preset frequency threshold, so as to characterize the stability weight of the installation process. Its value decreases monotonically as the adjustment frequency increases.

[0078] In this embodiment, the preset frequency threshold is determined based on the actual testing patterns of installation adjustment frequencies to define the boundary between occasional installation fluctuations and continuous installation anomalies. If the preset frequency threshold is too small, occasional adjustments during normal installation are easily judged as continuous anomalies, leading to unnecessary threshold adjustments and affecting system stability. If the preset frequency threshold is too large, continuous installation anomalies are difficult to identify in a timely manner, reducing the responsiveness to installation anomalies. By analyzing the distribution patterns of installation adjustment frequencies in different batches, an adjustment frequency judgment boundary that balances the ability to filter out occasional fluctuations and identify continuous anomalies is determined to ensure accurate judgment of changes in installation status.

[0079] In this embodiment, the preset confidence threshold is determined based on the actual test patterns of the comprehensive confidence level to define the judgment boundary between normal process fluctuations and process performance drift. If the preset confidence threshold is too low, normal process fluctuations can easily trigger parameter adjustments, leading to an over-response of the system to normal changes and affecting control stability. If the preset confidence threshold is too high, process performance drift is difficult to identify in a timely manner, reducing the timeliness of process adjustments. By analyzing the distribution patterns of the comprehensive confidence level under normal and drift states, a confidence judgment boundary that balances false trigger control and drift identification capabilities is determined to ensure that process parameters can be adjusted stably and accurately according to the actual state.

[0080] By converting the frequency of installation adjustments into a frequency factor that decreases with increasing frequency, and by weighting and correcting the geometric mean confidence values ​​of the three performance indicators, the confidence level of frequently adjusted batches can be proactively lowered, preventing overestimation of overall performance due to installation instability. When the corrected confidence level falls below a preset threshold, the judgment threshold is automatically reduced to improve defect interception capabilities; conversely, it remains at a normal level. This achieves a closed-loop linkage between installation quality and performance evaluation, resolving the imbalance between missed and false judgment risks caused by ignoring installation fluctuations.

[0081] On the other hand, this embodiment also provides a multifunctional high and low temperature precision testing stage, including: The test bench body 1 is equipped with a tooling fixture (not shown in the figure) for fixing the angle sensor under test and adjusting its horizontal position, a turntable for driving the angle sensor under test to rotate, a temperature chamber 2 for providing a closed temperature field and applying a programmable temperature environment, a transverse movement device 3 for driving the temperature chamber to move laterally along the guide rail, and a control module 4 for executing and controlling the test process. The control module includes a data acquisition unit, an installation and adjustment unit, a room temperature determination unit, a stability determination unit, a thermal field determination unit, an output unit, and an adjustment unit. The data acquisition unit is used to acquire the eccentricity of the angle sensor under test during installation, the turntable speed, the output angle value of the angle sensor under test, the static zero-point angle value, and the thermal deformation between the temperature chamber and the turntable when the fan is running at a preset speed. The installation adjustment unit is used to determine whether the installation is qualified based on the eccentricity and the preset eccentricity threshold. Based on the determination that the installation is not qualified, the horizontal position of the tooling fixture is adjusted according to the theoretical adjustment step length until the installation is qualified. The room temperature determination unit is used to adjust the step size or determine the room temperature performance index and the first test completion signal based on the determination result of qualified installation, according to the measured noise coupling ratio and the preset ratio threshold. The measured noise coupling ratio is determined based on the eccentricity, turntable speed and output angle value. The stability determination unit is used to determine the temperature stability index of the angle sensor and the second test completion signal based on the first test completion signal, the static zero-point angle value during the independent temperature chamber test and each preset test temperature; The thermal field determination unit is used to adjust the preset fan speed or determine the output high and low temperature performance indicators and the third test completion signal based on the second test completion signal, according to the relevant characteristics of the output angle value and thermal deformation during the high and low temperature test process, and the relevant characteristics of the output angle value and the multi-point temperature fluctuation value in the temperature chamber. The output unit is used to output test reports based on the room temperature performance index, temperature stability index, and high and low temperature performance index. The adjustment unit is used to adjust the preset ratio threshold according to the room temperature performance index, high and low temperature performance index, temperature stability index and the frequency of adjustment of the theoretical adjustment step size within the preset test cycle.

[0082] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention; various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A working method for a multifunctional high and low temperature precision testing stage, characterized in that, include: The installation is judged to be qualified based on the eccentricity of the measured angle sensor during installation and the preset eccentricity threshold. Based on the judgment result of unqualified installation, the horizontal position of the tooling fixture is adjusted according to the theoretical adjustment step size until the installation is qualified. Based on the installation qualification result, the theoretical adjustment step size or the judgment output room temperature performance index and the first test completion signal are adjusted according to the measured noise coupling ratio and the preset ratio threshold. The measured noise coupling ratio is determined based on the eccentricity, the acquired turntable speed and the output angle value of the angle sensor. Based on the first test completion signal, the temperature stability index of the angle sensor and the second test completion signal are determined according to the static zero angle value of the angle sensor and each preset test temperature obtained during the independent temperature chamber test. Based on the second test completion signal, adjust the preset fan speed or determine the output high and low temperature performance index and the third test completion signal according to the output angle value and the relevant characteristics of the thermal deformation between the temperature chamber and the turntable when the temperature chamber is running at the preset fan speed, the output angle value and the relevant characteristics of the multi-point temperature fluctuation value in the temperature chamber. Based on the third test completion signal, a test report is output according to the room temperature performance index, the temperature stability index, and the high and low temperature performance index; The preset ratio threshold is adjusted based on the room temperature performance index, the high and low temperature performance index, the temperature stability index, and the frequency of adjusting the theoretical adjustment step size within the preset test rounds.

2. The working method of the multifunctional high and low temperature precision testing stage according to claim 1, characterized in that, The process of adjusting the step length and leveling the tooling fixture to achieve the correct installation includes: The determination of installation failure is based on the comparison between the eccentricity and the preset eccentricity threshold, and the offset azimuth angle is recorded. Based on the determination of installation failure, the adjustment vector is determined according to the eccentricity vector, the theoretical adjustment step size, and the eccentricity. The eccentricity vector is determined based on the eccentricity and the offset azimuth angle, and the theoretical adjustment step size is determined based on the eccentricity and the preset eccentricity threshold. Adjust the tooling fixture to a horizontal position according to the adjustment vector until the installation is qualified, so as to obtain the installation qualification result.

3. The working method of the multifunctional high and low temperature precision testing stage according to claim 2, characterized in that, The process of adjusting the theoretical adjustment step size or determining the output room temperature performance index and the first test completion signal includes: The measured noise coupling ratio is determined based on the fluctuation characteristics of the output angle value and the coupling drift angle, wherein the coupling drift angle is determined based on the turntable rotation speed and the eccentricity. Based on the comparison results of the measured noise coupling ratio being less than the preset ratio threshold, the cause of the anomaly is determined to be eccentricity-dominated, and the preset deviation coefficient is increased according to the measured noise coupling ratio and the preset ratio threshold. Based on the comparison result that the measured noise coupling ratio is greater than or equal to the preset ratio threshold, the turntable servo is determined to be abnormal according to the angle output fluctuation value, or the room temperature performance index is determined according to the angle output fluctuation value, and the first test completion signal is output.

4. The working method of the multifunctional high and low temperature precision testing stage according to claim 3, characterized in that, The process of determining a turntable servo malfunction based on the angle output fluctuation value or determining the room temperature performance index based on the angle output fluctuation value and outputting the first test completion signal includes: Based on the comparison result that the angle output fluctuation value is less than or equal to the preset speed threshold, the room temperature performance index is determined according to the angle output fluctuation value and the preset speed threshold, and the first test completion signal is output. Based on the comparison result that the angle output fluctuation value is greater than the preset speed threshold, the turntable servo is determined to be abnormal and the proportional gain coefficient of the turntable servo driver is adjusted.

5. The working method of the multifunctional high and low temperature precision testing stage according to claim 4, characterized in that, The process of determining the temperature stability index of the angle sensor and the second test completion signal based on the static zero-point angle value and each preset test temperature includes: The temperature stability index of the angle sensor and the second test completion signal are determined based on the first and second temperature sensitivity coefficients, wherein... The first temperature sensitivity coefficient is determined based on the first zero-point mean, the second zero-point mean, and the first temperature change, wherein, The first zero-point mean is determined based on the static zero-point angle value at the first preset test temperature within the preset monitoring period; The second zero-point mean is determined based on the static zero-point angle value at the second preset test temperature within the preset monitoring period; The first temperature change is determined based on the first preset test temperature and the second preset test temperature; The second temperature sensitivity coefficient is determined based on the second zero-point mean, the third zero-point mean, and the second temperature change, wherein, The third zero-point average value is determined based on the static zero-point angle value at the third preset test temperature within the preset monitoring period. The second temperature change is determined based on the second and third preset test temperatures.

6. The working method of the multifunctional high and low temperature precision testing stage according to claim 5, characterized in that, The process of determining the temperature stability index of the angle sensor and the second test completion signal based on the first temperature sensitivity coefficient and the second temperature sensitivity coefficient includes: A comprehensive temperature sensitivity coefficient is determined based on the first temperature sensitivity coefficient and the second temperature sensitivity coefficient. Based on the threshold comparison result of the comprehensive temperature sensitivity coefficient, it is determined whether the stability of the angle sensor is qualified, and based on the determination result of whether the stability of the angle sensor is qualified, the temperature stability index and the second test completion signal are determined and output.

7. The working method of the multifunctional high and low temperature precision testing stage according to claim 6, characterized in that, The process of adjusting the preset fan speed or determining the output of the high and low temperature performance indicators and the third test completion signal based on the correlation characteristics of the output angle value and the thermal deformation amount, and the correlation characteristics of the output angle value and the multi-point temperature fluctuation value during the high and low temperature test includes: The preset fan speed is adjusted based on the speed variation correlation and temperature variation correlation, or the high and low temperature performance indicators and the third test completion signal are output based on the angle range. The variable speed correlation is determined based on the correlation characteristics of the output angle value and the thermal deformation at each temperature during the high and low temperature test. Temperature change correlation is determined based on the correlation characteristics of the output angle value and the multi-point temperature fluctuation value at each temperature during the high and low temperature test. The angle range is determined based on the output angle value during the high and low temperature test.

8. The working method of the multifunctional high and low temperature precision testing stage according to claim 7, characterized in that, The process of adjusting the preset fan speed based on the speed variation correlation and the temperature variation correlation, or determining and outputting the high and low temperature performance indicators and the third test completion signal based on the angle range, includes: Based on the comparison results that the speed change correlation is less than the preset first correlation threshold and the temperature change correlation is greater than the preset second correlation threshold, it is determined that the difference between high and low temperature output is caused by uneven temperature field. The preset fan speed is adjusted according to the preset adjustment step size and the high and low temperature test is re-executed. Based on the comparison results of the speed change correlation being less than a preset first correlation threshold and the temperature change correlation being less than or equal to a preset second correlation threshold, high and low temperature performance indicators and a third test completion signal are determined and output according to the angle range and the preset extreme value threshold.

9. The working method of the multifunctional high and low temperature precision testing stage according to claim 8, characterized in that, The process of adjusting the preset ratio threshold based on the room temperature performance index, the high and low temperature performance index, the temperature stability index, and the frequency of adjusting the theoretical adjustment step size within a preset test cycle includes: Based on the threshold comparison results of the corrected confidence level, the preset ratio threshold is adjusted according to the degree of deviation of the corrected confidence level, wherein, The confidence level is adjusted based on the confidence mean and the frequency of adjusting the theoretical adjustment step size; The confidence mean is determined based on the room temperature performance index, the high and low temperature performance index, and the temperature stability index of the angle sensor within the preset test rounds.

10. A multifunctional high and low temperature precision testing stage, applied to the testing method of the multifunctional high and low temperature precision testing stage according to any one of claims 1-9, characterized in that, include: The main body of the test bench is equipped with a tooling fixture for fixing the angle sensor under test and adjusting its horizontal position, a turntable for driving the angle sensor under test to rotate, a temperature chamber for providing a closed temperature field and applying a programmable temperature environment, a transverse movement device for driving the temperature chamber to move laterally along the guide rail, and a control module for executing and controlling the test process. The control module includes a data acquisition unit, an installation and adjustment unit, a room temperature determination unit, a stability determination unit, a thermal field determination unit, an output unit, and an adjustment unit. The acquisition unit is used to acquire the eccentricity of the angle sensor under test during installation, the turntable rotation speed, the output angle value of the angle sensor under test, the static zero-point angle value, and the thermal deformation between the temperature chamber and the turntable when the temperature sensor is running at a preset fan speed. The installation adjustment unit is used to determine whether the installation is qualified based on the eccentricity and the preset eccentricity threshold. Based on the determination that the installation is not qualified, the horizontal position of the tooling fixture is adjusted according to the theoretical adjustment step size until the installation is qualified. The room temperature determination unit is used to adjust the theoretical adjustment step size or determine the room temperature performance index and the first test completion signal based on the determination result of qualified installation, according to the measured noise coupling ratio and the preset ratio threshold. The measured noise coupling ratio is determined based on the eccentricity, the turntable speed and the output angle value. The stability determination unit is used to determine the temperature stability index of the angle sensor and the second test completion signal based on the first test completion signal, the static zero-point angle value during the independent temperature chamber test and each of the preset test temperatures. The thermal field determination unit is used to adjust the preset fan speed or determine the output high and low temperature performance index and the third test completion signal based on the second test completion signal, according to the relevant characteristics of the output angle value and the thermal deformation during the high and low temperature test, and the relevant characteristics of the output angle value and the multi-point temperature fluctuation value in the temperature chamber. The output unit is used to output a test report based on the room temperature performance index, the temperature stability index, and the high and low temperature performance index. The adjustment unit is used to adjust the preset ratio threshold according to the room temperature performance index, the high and low temperature performance index, the temperature stability index and the frequency of adjusting the theoretical adjustment step size within a preset test cycle.

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