Electronic actuator temperature characteristic calibration and verification method

Abstract

The invention provides an electronic actuator temperature characteristic calibration and verification method, and the calibration method comprises the steps: arranging an electronic actuator in an established gradient temperature test environment, and simulating the environment of an exhaust gas turbocharger; acquiring temperature field distribution data of the surface of the electronic actuator shell, and identifying the highest temperature point temperature and room temperature of the surface of the electronic actuator shell; recording the measurement angle of the output shaft of the electronic actuator and the standard output angle of the electronic actuator; calculating the angle deviation at the current temperature according to the measurement angle of the output shaft of the electronic actuator and the standard output angle of the electronic actuator; if the output shaft measurement angle is corrected to obtain an output shaft angle, the output shaft angle is taken as the output shaft angle, and the output shaft angle is a set angle deviation threshold value. The measurement angle of the output shaft is burnt into the memory of the electronic actuator, so that the measurement angle of the output shaft is corrected.

Description

Technical Field

[0001] This invention relates to the field of electronic actuator technology, and more specifically to a method for calibrating and verifying the temperature characteristics of electronic actuators. Background Technology

[0002] In the field of automotive electronic control technology, the exhaust gas turbocharger, as a key component for improving engine power performance and fuel economy, operates in a high-temperature environment, often reaching 150°C or even higher. The electronic actuator, as the core control unit of the exhaust gas turbocharger, needs to precisely control the output shaft angle under these high-temperature conditions to accurately adjust key parameters such as turbocharger boost pressure and bypass valve opening. The accuracy of its angle control directly determines the turbocharger's efficiency and the overall engine performance.

[0003] However, electronic actuators are susceptible to angular deviations due to temperature variations in high-temperature environments. Thermal deformation leads to control inaccuracies: at 150℃, the thermal expansion of the aluminum alloy housing causes a displacement of 0.25–0.35 mm in the output shaft (corresponding to an angular deviation of 1.8°–2.5°). Current calibration methods for thermal deformation involve manual measurement using a micrometer, followed by inputting the data into the system for calibration. However, manual measurement is inefficient (3–5 minutes per piece) and lacks accuracy (error > 1.0°).

[0004] In summary, there is an urgent need for a method for calibrating and verifying the temperature characteristics of electronic actuators to solve, or at least partially solve, the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a method for calibrating and verifying the temperature characteristics of electronic actuators, aiming to solve the technical problems of low efficiency and insufficient accuracy of existing calibration methods. The specific technical solution is as follows: A method for calibrating the temperature characteristics of an electronic actuator, comprising: S1. The electronic actuator is placed in the constructed gradient temperature test environment to simulate the environment of the exhaust gas turbocharger; S2. Obtain the temperature field distribution data on the surface of the electronic actuator housing, and identify the highest temperature point on the surface of the electronic actuator housing. and room temperature ; S3. Record the measured angle of the electronic actuator output shaft. and standard output angle of electronic actuator ; S4. Measure the angle based on the output shaft of the electronic actuator. and standard output angle of electronic actuator Calculate the angle deviation at the current temperature. ;like Then measure the angle of the output shaft. The output shaft angle is obtained after correction. ,like Then As the output shaft angle ,in This is the set angle deviation threshold.

[0006] Furthermore, angular deviation Specifically: (1) in, θ_std This is the standard angle value.

[0007] Furthermore, the output shaft measures the angle. The output shaft angle is obtained after correction. Specifically: (2) in, The coefficient of thermal expansion of the electronic actuator housing material. This is the maximum working angle of the electronic actuator.

[0008] Furthermore, a non-contact infrared image temperature matrix probe is used to scan the surface of the electronic actuator housing to obtain temperature field distribution data and identify the highest temperature point. .

[0009] Furthermore, the non-contact infrared image temperature matrix probe adopts... The array sensor, the spatial resolution of the non-contact infrared image temperature matrix probe .

[0010] Furthermore, the measured angle of the electronic actuator output shaft is recorded in real time via a coaxially connected magnetic encoder. sampling frequency .

[0011] Furthermore, in the constructed gradient temperature test environment, each time the temperature is heated to a set gradient temperature, the holding time at that gradient temperature is [duration missing]. H ; During this gradient temperature holding period, the electronic actuator operates cyclically according to a preset angle sequence: 5°→30°→60°→90°→60°→30°→5°; Dwell time at each angle For each second, S3 to S4 are executed sequentially for each angle of descent.

[0012] Furthermore, the gradient temperatures are 50℃, 100℃, and 150℃, respectively.

[0013] Further, the acquisition of the temperature field distribution data includes the following steps: S21. Divide the surface of the electronic actuator housing into an 8×8 grid area; S22. Synchronously collect the temperature values of 64 grid areas; S23. Denoise the collected temperature values through a Gaussian filtering algorithm; S24. Identify the coordinates (x, y) and the temperature value of the area with the highest temperature T_max .

[0014] In addition, the present invention also provides a method for verifying the temperature characteristics of an electronic actuator. By using the above calibration method, at each gradient temperature, at a certain standard angle value , a temperature-angle deviation relationship curve graph is generated; when the difference between the output angle values in all test data and the standard angle value is less than or equal to the angle threshold F, the product is determined to be qualified; otherwise, it is unqualified; where .

[0015] Applying the technical solution of the present invention has the following beneficial effects: By calibrating the electronic actuator using the above calibration method, by measuring the deviation between the measured angle of the output shaft corresponding to each gradient temperature and the standard output angle , if , then the measured angle of the output shaft is corrected to obtain the output shaft angle , if , then is used as the output shaft angle , where is the set angle deviation threshold. By burning the output shaft angle into the memory of the electronic actuator, the correction of the measured angle of the output shaft is realized; the entire correction process is self-detected by the sensor without manual measurement, which not only improves the detection efficiency but also improves the detection accuracy, thereby improving the correction speed and accuracy, greatly saving time, and improving the economy of correction.

[0016] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The following will refer to the accompanying drawings for a further detailed description of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a flowchart of a method for calibrating and verifying the temperature characteristics of an electronic actuator according to the present invention; Figure 2 It is a graph showing the actual measured temperature-angle deviation relationship, where the horizontal axis represents the temperature value and the vertical axis represents the angle value. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description is provided below, along with preferred embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0020] Example: See Figure 1 and Figure 2 This embodiment provides a method for calibrating the temperature characteristics of an electronic actuator, including: S1. The electronic actuator is placed in the constructed gradient temperature test environment to simulate the environment of the exhaust gas turbocharger. The gradient temperature test environment is constructed using a thermal environment simulation chamber with a temperature control range of -40℃ to 180℃ and an accuracy of ±1℃, so that the electronic actuator will undergo deformation due to temperature changes under the corresponding ambient temperature. S2. Obtain the temperature field distribution data on the surface of the electronic actuator housing, and identify the highest temperature point on the surface of the electronic actuator housing. and room temperature The temperature inside the thermal environment simulation chamber is increased from room temperature at a rate of 4-6℃ / min. T_room Rise to the target temperature; In this embodiment, the temperature of the highest temperature point is obtained. The method is as follows: S21. Divide the surface of the electronic actuator housing into an 8×8 grid area; measure the temperature of the grid area; Specifically, a non-contact infrared image temperature matrix probe is used to scan the surface of the electronic actuator housing to obtain temperature field distribution data and identify the highest temperature point. The non-contact infrared image temperature matrix probe measures the temperature of the electronic actuator housing. It can not only quickly acquire the temperature data of the electronic actuator, but also measure the temperature of multiple points simultaneously to form a real-time temperature matrix and image, which intuitively displays the temperature distribution of the electronic actuator. It can clearly show the highest temperature point of the electronic actuator, and the detected temperature data can be output as a numerical value, which is convenient for subsequent recording and processing of temperature data.

[0021] Furthermore, the non-contact infrared image temperature matrix probe adopts... The array sensor, the spatial resolution of the non-contact infrared image temperature matrix probe It is known that the smaller the spatial resolution value, the higher the accuracy of the measurement; the larger the data volume, the more precise the result.

[0022] S22. Simultaneously collect temperature values ​​from 64 grid areas; S23. Denoise the collected temperature values ​​using a Gaussian filtering algorithm; S24. Identify the coordinates (x, y) of the region with the highest temperature and its temperature value. T_max .

[0023] S3. Record the measured angle of the electronic actuator output shaft. and standard output angle of electronic actuator ; Electronic actuator output shaft angle measurement The following method is used to obtain the measured angle of the output shaft: A magnetic encoder is installed on the output shaft of the electronic actuator. The actual output angle of the output shaft is measured using the magnetic encoder, thereby obtaining the measured angle of the output shaft. The magnetic encoder has a resolution of 0.1° and a sampling frequency of [missing information]. Compared to manual measurement, the accuracy is greatly improved, and the measurement efficiency is significantly increased.

[0024] S4. Measure the angle based on the output shaft of the electronic actuator. and standard output angle of electronic actuator Calculate the angle deviation at the current temperature. ;like Then measure the angle of the output shaft. The output shaft angle is obtained after correction. ,like Then As the output shaft angle ,in The set angle deviation threshold is D. The value of D is between 0.1° and 0.3°, and in this embodiment, D is 0.3°.

[0025] Output shaft angle The data is programmed into the electronic actuator's memory via a dedicated programmer's communication bus, enabling the electronic actuator to retrieve the output shaft angle data from the memory based on the actual temperature measured by the temperature sensor during actual use. It also outputs the output shaft angle data at the corresponding temperature. .

[0026] Furthermore, angular deviation Specifically: (1) in, θ_std This is the standard angle value, which refers to the theoretical output angle of the electronic actuator.

[0027] Furthermore, the output shaft measures the angle. The output shaft angle is obtained after correction. Specifically: (2) in, The coefficient of thermal expansion is the material of the electronic actuator housing. Different materials used for the electronic actuator housing result in different coefficients of thermal expansion. In this embodiment, aluminum alloy is used. Value / ℃, This is the maximum working angle of the electronic actuator; For temperature difference load, This is the angular position scaling factor.

[0028] Furthermore, in the constructed gradient temperature test environment, each time the temperature is heated to a set gradient temperature, the holding time at that gradient temperature is [duration missing]. H Specifically, H can be between 8 minutes and 15 minutes; in this embodiment, H is 10 minutes.

[0029] During this gradient temperature holding period, the electronic actuator operates cyclically according to a preset angle sequence: 5°→30°→60°→90°→60°→30°→5°; Dwell time at each angle For each second, S3 to S4 are executed sequentially for each angle of descent.

[0030] Furthermore, the gradient temperatures are 50℃, 100℃, and 150℃. The temperature is maintained at each of the three gradient temperature points for 10 minutes.

[0031] In addition, this embodiment also provides a method for verifying the temperature characteristics of an electronic actuator, which uses the above-described calibration method to obtain the temperature characteristics of a certain standard angle value at various gradient temperatures. , , , the corresponding and are obtained to generate a temperature-angle deviation relationship curve; among them, the temperature-angle deviation relationship curve when the standard value angle is 90° is as shown in Figure 2 . It can be intuitively seen from the temperature-angle deviation relationship curve that the measured angle of the output shaft before correction and the standard output angle ; as well as the relationship between the angle of the output shaft after correction and the standard output angle ; when the difference between the output angle value and the standard angle value in all test data is less than or equal to the angle threshold F, the product is judged to be qualified, otherwise unqualified; among them, . The value of F ranges from 0.1° to 0.8°; in this embodiment, F takes 0.5°, of course, in some other embodiments of this application, according to the actual needs of the application, F can also take other values between 0.1° and 0.8°, and the higher the requirement, the lower the value.

[0032] Application case: Install the electronic actuator to be tested on the heat conduction tooling in the thermal environment simulation chamber, and ensure that the magnetic encoder is coaxially connected to the output shaft of the electronic actuator; Select the electronic actuator model in the control software, and automatically load the material parameter α (such as ADC12 aluminum alloy α = 23.4×10⁻ 5 / ℃).

[0033] Record that at room temperature, control the actuator to rotate to 90.0° and hold for 5 seconds; The infrared probe scans the housing, and the actual highest temperature point is shown to be located at the upper right corner of the motor cover, T_max = 25.5℃; The magnetic encoder records the measured angle of the output shaft θ_meas = 90.0°.

[0034] Start the thermal environment simulation chamber and heat it up at a rate of 5℃ / min; Heat up the thermal environment simulation chamber to 50℃ and hold: Control the actuator to rotate to 90° and hold for 5 seconds; The infrared probe scans the housing, and the actual highest temperature point is shown to be located at the upper right corner of the motor cover, T_max = 52.3℃; The magnetic encoder records the measured angle of the output shaft θ_meas = 89.9°.

[0035] The thermal environment simulation chamber was heated to 100°C and maintained at that temperature. Control the actuator to rotate to 90° and hold for 5 seconds; The infrared sensor scanned the casing and showed that the highest temperature point was located at the center of the motor cover. T_max =52.3℃; Magnetic encoder records output shaft measurement angle θ_meas =89.6°.

[0036] The thermal environment simulation chamber was heated to 150°C and maintained at that temperature. Control the actuator to rotate to 90° and hold for 5 seconds; The infrared sensor scanned the housing, and the actual highest temperature point was located at the lower right corner of the gearbox. T_max =52.3℃; Magnetic encoder records output shaft measurement angle θ_meas =88.7°.

[0037] Based on the actual temperature data, the highest temperature points of the electronic actuator housing at ambient temperatures of 25℃, 50℃, 100℃, and 150℃ were obtained. Among them: At 25℃, the highest temperature point is located at the upper right corner of the motor cover, with a temperature of 25.5℃; At 50℃, the highest temperature point is located at the upper right corner of the motor cover, with a temperature of 51.5℃; At 100℃, the highest temperature point is located at the center of the motor cover, with a temperature of 106.2℃; At 150℃, the highest temperature point is located at the center of the motor cover, with a temperature of 156.8℃.

[0038] This phenomenon of temperature peak migration is due to changes in the equilibrium state of heat exchange between the actuator's internal heat sources (motor coil, gear friction heat) and the environment at different temperature ranges. This method captures... T_max The real-time position and temperature value are used to accurately correct angular deviations caused by thermal expansion.

[0039] Further, follow step S4 to obtain the results for each test case. All obtained through the data bus Write it into the memory of the electronic actuator.

[0040] Among them, it meets the requirements under the test conditions of 150℃ / 90°. ,but The calculation is as follows: =88.7 + 0.2925 × 0.986 =88.7+0.288 =88.988 → Calibration rounded to 89.0° Furthermore, after summarizing all the test data and filling in the table, the following report is generated: Note: After compensation at 150℃, the deviation exceeds 0.3° ( The angle threshold F) is used to determine that the material deformation is out of tolerance.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the 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 scope of protection of the present invention.

Claims

1. A method for calibrating the temperature characteristics of an electronic actuator, characterized in that, include: S1. The electronic actuator is placed in the constructed gradient temperature test environment to simulate the environment of the exhaust gas turbocharger; S2. Obtain the temperature field distribution data on the surface of the electronic actuator housing, and identify the highest temperature point on the surface of the electronic actuator housing. and room temperature ; S3. Record the measured angle of the electronic actuator output shaft. and standard output angle of electronic actuator ; S4. Measure the angle based on the output shaft of the electronic actuator. and standard output angle of electronic actuator Calculate the angle deviation at the current temperature. ;like Then measure the angle of the output shaft. The output shaft angle is obtained after correction. ,like Then As the output shaft angle ,in This is the set angle deviation threshold.

2. The method for calibrating the temperature characteristics of an electronic actuator according to claim 1, characterized in that, Angle deviation Specifically: （1）。 3. The method for calibrating the temperature characteristics of an electronic actuator according to claim 2, characterized in that, Output shaft measuring angle The output shaft angle is obtained after correction. Specifically: （2） in, The coefficient of thermal expansion of the electronic actuator housing material. This is the maximum working angle of the electronic actuator.

4. The method for calibrating the temperature characteristics of an electronic actuator according to claim 1, characterized in that: A non-contact infrared imaging temperature matrix probe is used to scan the surface of the electronic actuator housing to acquire temperature field distribution data and identify the highest temperature point. .

5. The method for calibrating the temperature characteristics of an electronic actuator according to claim 4, characterized in that: The non-contact infrared image temperature matrix probe uses The array sensor, the spatial resolution of the non-contact infrared image temperature matrix probe .

6. The method for calibrating the temperature characteristics of an electronic actuator according to claim 1, characterized in that: The measured angle of the output shaft of the electronic actuator is recorded in real time via a coaxially connected magnetic encoder. sampling frequency .

7. The method for calibrating the temperature characteristics of an electronic actuator according to claim 1, characterized in that: The established gradient temperature test environment, when heated to a set gradient temperature, requires a holding time of [duration missing]. H ; During this gradient temperature holding period, the electronic actuator operates cyclically according to a preset angle sequence: 5°→30°→60°→90°→60°→30°→5°； Dwell time at each angle For each second, S3 to S4 are executed sequentially for each angle of descent.

8. The method for calibrating the temperature characteristics of an electronic actuator according to claim 7, characterized in that: The gradient temperatures are 50℃, 100℃, and 150℃, respectively.

9. The method for calibrating the temperature characteristics of an electronic actuator according to claim 1, characterized in that: The acquisition of the temperature field distribution data includes the following steps: S21. Divide the surface of the electronic actuator housing into an 8×8 grid area; S22. Simultaneously collect temperature values ​​from 64 grid areas; S23. Denoise the collected temperature values ​​using a Gaussian filtering algorithm; S24. Identify the coordinates (x, y) of the region with the highest temperature and its temperature value. T_max .

10. A method for verifying the temperature characteristics of an electronic actuator, characterized in that: The calibration method described in any one of claims 1-9 is used to obtain the value of a standard angle at each gradient temperature. Generate a temperature-angle deviation curve; When the output angle values in all test data and the standard angle values The difference are all less than or equal to the angle threshold F the product is judged to be qualified, otherwise unqualified; among them, .

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