Automobile air conditioner damper actuator linearity detection method and device

Abstract

The present application relates to actuator linearity detection technical field, specifically relates to a kind of linear degree detection method and equipment for automobile air conditioner air door actuator.The present application utilizes guide plastic potentiometer to measure the rotation angle of air door actuator, then obtains the correction angle of each rotation angle, and then corrects the corresponding guide plastic voltage;Then analyze the error of guide plastic voltage before and after correction under each rotation angle, obtain measurement accuracy coefficient;Again, in combination with the change relationship between correction guide plastic voltage and execution voltage, obtain the measurement confidence under each rotation angle;Finally, based on the measurement confidence, analyze the fitting error of the fitting straight line relationship between execution voltage and rotation angle, evaluate the linearity of air door actuator.The present application analyzes the change relationship between guide plastic voltage, rotation angle and execution voltage, evaluates the measurement accuracy of guide plastic potentiometer, and then accurately evaluates the linear relationship between execution voltage and rotation angle, improves the linearity detection accuracy of air door actuator.

Description

Technical Field

[0001] This invention relates to the field of actuator linearity testing technology, specifically to a method and equipment for testing the linearity of automotive air conditioning damper actuators. Background Technology

[0002] The damper actuator in an automotive air conditioning system is used to control the opening and closing or position of the dampers in the air conditioning system, thereby regulating the airflow direction, temperature, and air volume. The linearity of the damper actuator refers to the degree to which the output of the damper actuator (such as damper opening degree, rotation angle, etc.) maintains a linear relationship with the input (usually a control signal, such as the actuator's execution voltage or current). Good linearity helps to accurately control the automotive air conditioning system, so it is crucial to test the linearity of the automotive air conditioning damper actuator.

[0003] Currently, the working environment of an automotive air conditioning damper actuator can be simulated by continuously adjusting the actuator's control signal (such as voltage or current) and inputting it into the damper. The damper adjusts the damper angle (theoretical angle) according to the signal. Then, the actual damper angle is detected by a sensor such as a conductive potentiometer, and the actual angle is compared with the theoretical adjustment angle to determine whether the actuator exhibits good linearity. However, this method is also affected by sensor acquisition errors or accuracy, resulting in low accuracy in detecting the linearity of the damper actuator. Summary of the Invention

[0004] To address the technical problem of low accuracy in linearity detection of damper actuators, the present invention aims to provide a method and device for linearity detection of automotive air conditioning damper actuators. The specific technical solution adopted is as follows:

[0005] A method for detecting the linearity of an automotive air conditioning damper actuator, the method comprising:

[0006] The rotation angle of the damper actuator was measured using a conductive potentiometer; at each rotation angle, the angle fluctuation deviation was obtained, and the conductive voltage of the conductive potentiometer and the actuation voltage of the damper actuator were recorded.

[0007] At each rotation angle, the angle fluctuation range is determined based on the angle fluctuation deviation, and the voltage fluctuation range of the execution voltage is determined by combining the relationship between the execution voltage and the rotation angle. Based on the execution voltage recorded under the angle fluctuation range of each rotation angle, and the deviation of the execution voltage relative to the voltage fluctuation range, the correction angle for each rotation angle is obtained by combining the angle fluctuation deviation and the relationship between the execution voltage and the rotation angle.

[0008] Based on the ideal linear relationship between the guide voltage and the rotation angle, and combined with the correction angle, the corresponding guide voltage is corrected. Then, based on the change relationship between the guide voltage and the correction angle, the error of the guide voltage before and after correction at each rotation angle is analyzed to obtain the measurement accuracy coefficient. Based on the change relationship between the corrected guide voltage and the actuation voltage, and combined with the measurement accuracy coefficient, the measurement confidence level at each rotation angle is obtained. Based on the measurement confidence level, the fitting error of the fitted linear relationship between the actuation voltage and the rotation angle is analyzed to evaluate the linearity of the damper actuator.

[0009] Furthermore, the method for obtaining the angle fluctuation deviation includes:

[0010] Under the same operating voltage, the instantaneous rotation angle of the damper actuator is measured using a conductive potentiometer, and the random error is obtained based on the fluctuation of the instantaneous rotation angle. The angle fluctuation deviation is obtained by combining the random error and the systematic error during measurement.

[0011] Furthermore, the methods for obtaining the angle fluctuation range and the voltage fluctuation range include:

[0012] By floating the angle fluctuation deviation upwards and downwards for each rotation angle, the corresponding angle fluctuation range is obtained;

[0013] A first linear relationship model between the execution voltage and the rotation angle is fitted; the upper and lower limits of the angle within the angle fluctuation range are substituted into the first linear relationship model to determine the upper and lower limits of the execution voltage, thus obtaining the voltage fluctuation range of the execution voltage.

[0014] Furthermore, the method for obtaining the correction angle includes:

[0015] At each rotation angle, based on the execution voltage recorded within the angle fluctuation range, and the difference between the execution voltage and the execution voltage within the voltage fluctuation range, the voltage deviation and deviation direction of the execution voltage are obtained.

[0016] A local linear relationship model is established between the rotation angle within the angle fluctuation range and the execution voltage recorded within the voltage fluctuation range. Based on the difference between the corresponding model parameters of the first linear relationship model and the local linear relationship model, and combined with the angle fluctuation deviation and the voltage deviation, the angle deviation under the corresponding rotation angle is obtained.

[0017] At each rotation angle, the opposite direction of the deviation direction is taken as the angle correction direction. Based on the correction direction and the angle deviation, the deviation correction amplitude is determined, and the rotation angle is corrected in combination with the correction direction to obtain the correction angle.

[0018] Furthermore, the method for obtaining the voltage deviation and the direction of the deviation includes:

[0019] Within the angular fluctuation range of each rotation angle, the execution voltage recorded at the upper limit of the angle is taken as the upper limit of the recorded voltage, and the execution voltage recorded at the lower limit of the angle is taken as the lower limit of the recorded voltage.

[0020] The voltage deviation is determined by combining the difference between the upper limit of the recorded voltage and the upper limit of the voltage fluctuation range, and the difference between the lower limit of the recorded voltage and the lower limit of the voltage fluctuation range.

[0021] The deviation direction is determined based on the relationship between the upper limit of the recorded voltage and the upper limit of the voltage fluctuation range, and the relationship between the lower limit of the recorded voltage and the lower limit of the voltage fluctuation range.

[0022] Furthermore, the method for obtaining the angle deviation includes:

[0023] The model parameters are two-dimensional data consisting of the slope and intercept in the linear relationship model; the Euclidean norm between the corresponding model parameters of the first linear relationship model and the local linear relationship model is used as the first angle error; the angle fluctuation deviation and the voltage deviation under the corresponding rotation angle are fused to obtain the second angle error; the first angle error and the second angle error are fused to obtain the angle deviation weight under the corresponding rotation angle; the angle fluctuation deviation is weighted using the angle deviation weight to obtain the angle deviation under the corresponding rotation angle.

[0024] Furthermore, the method for obtaining the measurement accuracy coefficient includes:

[0025] A second linear relationship model between the plastic guide voltage and the correction angle is fitted; the slope of the model is determined based on the maximum voltage of the plastic guide potentiometer and the maximum rotation angle of the actuator, and an ideal linear model between the plastic guide voltage and the rotation angle is fitted.

[0026] At each correction angle, the difference between the pre-correction conductive voltage and the corresponding conductive voltage in the ideal linear model is taken as the ideal deviation, and the difference between the corrected conductive voltage and the corresponding conductive bias voltage in the second linear relationship model is taken as the actual deviation.

[0027] For each interval endpoint of the rotation angle, the first variation error is obtained based on the absolute value of the difference between the ideal deviation and the actual deviation, and the magnitude of the ideal deviation; the negative correlation mapping result of the first variation error is used as the measurement accuracy coefficient.

[0028] For each other interval value of the rotation angle, the measurement accuracy coefficient is obtained based on the magnitude of the ideal deviation and the actual deviation, combined with the deviation between the two.

[0029] Furthermore, the method for obtaining the measurement confidence level includes:

[0030] A third linear relationship model is fitted between the corrected guide voltage and the execution voltage. At each rotation angle, the corrected guide voltage is input into the third linear relationship model to obtain the fitted execution voltage. The difference between the fitted execution voltage and the execution voltage recorded at the corresponding rotation angle is negatively correlated and mapped. The negative correlation mapping result is used as the measurement reference weight at each rotation angle. The measurement accuracy coefficient is weighted using the measurement reference weight, and the weighted result is used as the measurement confidence level at each rotation angle.

[0031] Furthermore, methods for evaluating the linearity of damper actuators include:

[0032] When calculating the deviation of each data point corresponding to the voltage-rotation angle from the first linear relationship model, the measurement confidence level is used as the weight of the corresponding deviation, and the weighted sum of all deviations is used as the fitting error; when the fitting error is greater than the preset threshold, the linearity of the damper actuator is determined to be poor.

[0033] A linearity testing device for an automotive air conditioning damper actuator includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements any of the steps of the method for testing the linearity of an automotive air conditioning damper actuator.

[0034] The present invention has the following beneficial effects:

[0035] This invention utilizes a conductive potentiometer to measure the rotation angle of a damper actuator. At each rotation angle, the angle fluctuation deviation is acquired, and the conductive voltage of the potentiometer and the actuator's execution voltage are recorded. At each rotation angle, the angle fluctuation range is determined based on the angle fluctuation deviation, and the voltage fluctuation range of the execution voltage is determined by combining the relationship between the execution voltage and the rotation angle. Based on the recorded execution voltage at each rotation angle's angle fluctuation range, and its deviation relative to the voltage fluctuation range, combined with the angle fluctuation deviation and the relationship between the execution voltage and the rotation angle, a correction angle is obtained for each rotation angle. Based on the ideal linear relationship between the conductive voltage and the rotation angle, and combined with the correction angle, the corresponding conductive voltage is corrected. Furthermore, based on the relationship between the conductive voltage and the correction angle, the error of the conductive voltage before and after correction at each rotation angle is analyzed, and a measurement accuracy coefficient is obtained. Based on the relationship between the corrected conductive voltage and the execution voltage, and combined with the measurement accuracy coefficient, the measurement confidence level at each rotation angle is obtained. Based on the measurement confidence level, the fitting error of the linear relationship between the execution voltage and the rotation angle is analyzed, and the linearity of the damper actuator is evaluated. This invention evaluates the measurement accuracy of the conductive potentiometer by analyzing the relationship between the conductive voltage, rotation angle, and actuation voltage, and then accurately assesses the linear relationship between the actuation voltage and rotation angle, thereby improving the accuracy of linearity detection of the damper actuator. Attached Figure Description

[0036] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a flowchart of a method for detecting the linearity of an automotive air conditioning damper actuator, provided in one embodiment of the present invention.

[0038] Figure 2 This is a flowchart illustrating a method for obtaining a correction angle according to an embodiment of the present invention. Detailed Implementation

[0039] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a method and device for detecting the linearity of an automotive air conditioning damper actuator according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0040] 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.

[0041] The following description, in conjunction with the accompanying drawings, details a specific scheme for a linearity detection method and device for automotive air conditioning damper actuators provided by the present invention.

[0042] Please see Figure 1 The document illustrates a flowchart of a method for detecting the linearity of an automotive air conditioning damper actuator according to an embodiment of the present invention, specifically including:

[0043] Step S1: Measure the rotation angle of the damper actuator using a conductive potentiometer; at each rotation angle, obtain the angle fluctuation deviation and record the conductive voltage of the conductive potentiometer and the actuation voltage of the damper actuator.

[0044] In one embodiment of the present invention, the conductive potentiometer is first powered by a constant 12V vehicle voltage. The resistance of the conductive potentiometer can be adjusted to provide different execution voltages (0-12V) to the actuator potentiometer of the damper actuator, thereby controlling the damper actuator to rotate at different angles under different execution voltages. At the same time, the conductive potentiometer can also be used to measure the rotation angle of the damper actuator.

[0045] Then, under different execution voltages, the rotation angle of the damper actuator is obtained using a conductive potentiometer, and the angle fluctuation deviation of the damper actuator is evaluated. Here, angle fluctuation refers to the situation where the rotation angle of the damper actuator cannot be stabilized and fluctuates up and down under each execution voltage due to the control factors of the damper actuator or the measurement factors of the conductive potentiometer. The angle fluctuation deviation is the floating value.

[0046] When measuring the rotation angle of the damper actuator, the conductive voltage of the conductive potentiometer and the execution voltage of the actuator potentiometer are recorded simultaneously at each rotation angle. The conductive voltage reflects the input voltage of the actuator potentiometer, and the execution voltage reflects the output voltage of the actuator potentiometer, as well as the input voltage or control voltage of the actuator.

[0047] Preferably, in one embodiment of the present invention, considering that when the conductive potentiometer measures the rotation angle of the actuator under a certain execution voltage, the rotation angle may fluctuate, resulting in random errors. Furthermore, the conductive potentiometer itself may also experience systematic errors due to factors such as sensor accuracy when measuring the rotation angle. Both types of errors can cause fluctuations in the rotation angle under the same execution voltage. Therefore, the method for obtaining the angle fluctuation deviation includes:

[0048] Under the same operating voltage, the instantaneous rotation angle of the damper actuator is measured using a conductive potentiometer, and the random error is obtained based on the fluctuation of the instantaneous rotation angle. The angle fluctuation deviation is obtained by combining the random error and the systematic error during measurement.

[0049] In one embodiment of the present invention, the change of the execution voltage is first controlled, that is, the resistance of the conductive potentiometer is changed so that the conductive voltage of the actuator changes continuously in an arithmetic manner, for example, starting from 0V and increasing by 1V per minute until it reaches 12V and stops. The change of the conductive voltage causes the execution voltage to change continuously. Then, under the execution voltage corresponding to each conductive voltage, the instantaneous rotation angle of the damper actuator at each sampling moment within each minute is collected using the conductive potentiometer. The sampling frequency can be set to once per second or can be customized.

[0050] Then, the mean of the instantaneous rotation angles within one minute is taken as the rotation angle of the actuator measured by the conductive potentiometer under that operating voltage, and the standard deviation of the instantaneous rotation angles within one minute is taken as the random error; then, the linearity of the conductive potentiometer is obtained. ,Will The systematic error during the measurement of the conductive potentiometer is the angle measurement deviation; finally, the sum of the random error and the systematic error is taken as the angle fluctuation deviation for each rotation angle.

[0051] It should be noted that the linearity of the conductive potentiometer can be obtained from the design specifications, and will not be elaborated further.

[0052] Step S2: For each rotation angle, determine the angle fluctuation range based on the angle fluctuation deviation, and determine the voltage fluctuation range of the execution voltage based on the relationship between the execution voltage and the rotation angle; based on the execution voltage recorded under the angle fluctuation range of each rotation angle, and the deviation of the execution voltage relative to the voltage fluctuation range, and combined with the angle fluctuation deviation and the relationship between the execution voltage and the rotation angle, obtain the correction angle for each rotation angle.

[0053] Considering that the rotation angle will fluctuate within a certain range due to the angular fluctuation deviation at each rotation angle, this embodiment of the invention first determines the angular fluctuation range for each rotation angle based on the angular fluctuation deviation; at the same time, it further determines the voltage fluctuation range of the execution voltage by combining the relationship between the execution voltage and the rotation angle. The voltage fluctuation range reflects the theoretical fluctuation of the execution voltage caused by the rotation angle fluctuation, which prepares for subsequent evaluation of the measurement accuracy of the rotation angle by using the actual fluctuation of the execution voltage caused by the rotation angle fluctuation, in order to correct the rotation angle.

[0054] Preferably, in one embodiment of the present invention, considering that the rotation angle will fluctuate during measurement, the angle fluctuation range can be obtained; and considering the relationship between the execution voltage and the rotation angle, it can provide a theoretical analysis basis for evaluating the theoretical fluctuation of the execution voltage caused by the rotation angle fluctuation, thereby facilitating the evaluation of the execution voltage fluctuation range based on the angle fluctuation range; therefore, the method for obtaining the fitting angle fluctuation range and voltage fluctuation range includes:

[0055] The angle fluctuation range is obtained by floating the angle fluctuation deviation upwards and downwards for each rotation angle.

[0056] A first linear relationship model between the execution voltage and the rotation angle is fitted; the upper and lower limits of the angle within the angle fluctuation range are substituted into the first linear relationship model to determine the upper and lower limits of the execution voltage, thus obtaining the voltage fluctuation range of the execution voltage.

[0057] As an example, suppose at each rotation angle Below, the corresponding angular fluctuation deviation is The range of angular fluctuation is ,in This is the lower limit of the angle. The upper limit of the angle is determined; then, a linear fit is performed between the fitted execution voltage and the rotation angle using the least squares method, where the rotation angle is the horizontal axis parameter and the execution voltage is the vertical axis parameter, resulting in the first linear relationship model L1, and the model parameters (k1, d1) are obtained, where k1 is the slope of the line and d1 is the intercept of the line; the lower limit of the execution voltage is obtained using the first linear relationship model L1. and voltage upper limit This allows us to obtain the voltage fluctuation range of the execution voltage. .

[0058] It should be noted that the methods for line fitting using the least squares method and for obtaining the slope and intercept of the line are existing technologies well known to those skilled in the art, and will not be elaborated further.

[0059] After obtaining the theoretical voltage fluctuation range of the execution voltage corresponding to the angle fluctuation range of each rotation angle, we can further compare the actual fluctuation range of the actual execution voltage corresponding to the angle fluctuation range, thereby indirectly analyzing the measurement deviation of the conductive potentiometer on the rotation angle, so as to help correct the rotation angle.

[0060] Considering the relationship between the operating voltage and the rotation angle within the actual fluctuation range, which reflects a local linear relationship, while the actual measurement obtains a global linear relationship, comparing the local and global linear relationships can help evaluate the measurement deviation of the conductive potentiometer on the rotation angle, thereby helping to correct the rotation angle; also, considering that the smaller the angle fluctuation deviation, it also indicates that the measurement deviation of the rotation angle is smaller, so as to correct the rotation angle.

[0061] Based on this, the embodiments of the present invention will obtain the correction angle for each rotation angle by combining the recorded execution voltage under the angle fluctuation range of each rotation angle, the deviation of the execution voltage relative to the voltage fluctuation range, the angle fluctuation deviation, and the change relationship between the execution voltage and the rotation angle; this prepares for reducing measurement interference of the conductive potentiometer and accurately evaluating linearity.

[0062] Preferably, in one embodiment of the present invention, the method for obtaining the correction angle includes:

[0063] Please see Figure 2 The diagram illustrates a flowchart of a method for obtaining a correction angle according to an embodiment of the present invention, specifically including:

[0064] Step S201: At each rotation angle, based on the execution voltage recorded within the angle fluctuation range and the difference in execution voltage within the relative voltage fluctuation range, obtain the voltage deviation and deviation direction of the execution voltage.

[0065] Considering that the change in the executed voltage within the voltage fluctuation range may differ from the actual change in the executed voltage, a large deviation indicates that the conductive potentiometer may have a large measurement error. This may cause the theoretical executed voltage to differ from the actual executed voltage at the same rotation angle. Therefore, the voltage deviation can be obtained and the direction of the deviation can be evaluated to prepare for subsequent correction.

[0066] In a preferred embodiment of the present invention, the method for obtaining the voltage deviation and the deviation direction includes:

[0067] Within the angular fluctuation range of each rotation angle, the execution voltage recorded at the upper limit of the angle is taken as the upper limit of the recorded voltage, and the execution voltage recorded at the lower limit of the angle is taken as the lower limit of the recorded voltage.

[0068] By comprehensively recording the difference between the upper limit of voltage and the upper limit of voltage fluctuation range, and by recording the difference between the lower limit of voltage and the lower limit of voltage fluctuation range, the voltage deviation is determined.

[0069] The direction of deviation is determined by the relationship between the upper limit of the recorded voltage and the upper limit of the voltage fluctuation range, and the relationship between the lower limit of the recorded voltage and the lower limit of the voltage fluctuation range.

[0070] As an example, taking any rotation angle as an example, adjust the conductive voltage so that the rotation angle of the actuator measured by the conductive potentiometer is the lower limit of the angle fluctuation range. The execution voltage recorded at this time is used as the lower limit of the recording voltage. Similarly, obtain the upper limit of the recorded voltage. ;

[0071] Then measure the voltage deviation. ,in , These are the voltage fluctuation ranges. The lower and upper limits; the difference is measured by the absolute value of the difference, obtaining the difference between the upper limit of the recorded voltage and the upper limit of the voltage fluctuation range. And record the difference between the lower limit of voltage and the lower limit of voltage fluctuation range. And select the maximum value from the two as the voltage deviation;

[0072] Finally, the direction of deviation is determined, and the formula for obtaining the direction of deviation is: ;in, The sign for the direction of deviation; This is a sign function; when the upper limit of the recorded voltage is greater than the upper limit of the voltage fluctuation range, and the lower limit of the recorded voltage is greater than the lower limit of the voltage fluctuation range, and If both are positive, the sign function is 1, the deviation direction is positive, indicating that the actual record is larger than the theoretical record; conversely, when the upper limit of the recorded voltage is greater than the upper limit of the voltage fluctuation range and the lower limit of the recorded voltage is greater than the lower limit of the voltage fluctuation range, the sign function is -1, the deviation direction is negative, indicating that the actual record is smaller than the theoretical record.

[0073] It should be noted that adjusting the conductive voltage to control the rotation angle of the actuator measured by the conductive potentiometer is a well-known technique in the art and will not be elaborated further.

[0074] Step S202: Fit a local linear relationship model between the rotation angle within the angle fluctuation range and the execution voltage recorded within the voltage fluctuation range; based on the difference between the corresponding model parameters of the first linear relationship model and the local linear relationship model, and combined with the angle fluctuation deviation and voltage deviation, obtain the angle deviation under the corresponding rotation angle.

[0075] To assess the measurement deviation of the rotation angle by leveraging the difference between local and global linear relationships, one embodiment of the present invention first analyzes the local linear relationship between the rotation angle within the angle fluctuation range and the actual recorded execution voltage, fitting a local linear relationship model. Specifically, using the rotation angle within the angle fluctuation range as the horizontal axis parameter and the recorded execution voltage as the vertical axis parameter, two data points are determined based on the upper and lower limits of the recording voltage corresponding to the upper and lower limits of the angle fluctuation range. , Then, the local linear relationship model is determined directly based on the two-point method. The implementer can also determine multiple data points to perform line fitting and obtain the local linear relationship model.

[0076] After obtaining the local linear relationship model, the difference between the local linear relationship model and the global linear relationship model, i.e. the first linear relationship model, can be further compared to preliminarily assess the measurement deviation; further, the angle fluctuation deviation and voltage fluctuation deviation can be combined to comprehensively assess the angle deviation under each rotation angle.

[0077] In a preferred embodiment of the present invention, the method for obtaining the angle deviation includes:

[0078] The model parameters are two-dimensional data consisting of the slope and intercept in the linear relationship model; the Euclidean norm between the corresponding model parameters of the first linear relationship model and the local linear relationship model is used as the first angle error; the angle fluctuation deviation and the voltage deviation under the corresponding rotation angle are fused to obtain the second angle error; the first angle error and the second angle error are fused to obtain the angle deviation weight under the corresponding rotation angle; the angle fluctuation deviation is weighted using the angle deviation weight to obtain the angle deviation.

[0079] As an example, taking any rotation angle as an example, let's consider the angle fluctuation deviation. With voltage deviation The product of the first and second angle errors is used as the second angle error; then the first angle error and the second angle error are multiplied and combined, and the product is mapped to the hyperbolic tangent function for normalization to obtain the angle deviation weight; then the angle deviation weight is multiplied by the angle fluctuation deviation to obtain the angle deviation.

[0080] It should be noted that the calculation of Euclidean norm is an existing technology and will not be elaborated further; in other examples, implementers may also use addition or weighted summation to perform the fusion operation, which will not be elaborated further.

[0081] Step S203: For each rotation angle, the opposite direction of the deviation direction is taken as the angle correction direction. Based on the correction direction and the angle deviation, the deviation correction amplitude is determined, and the rotation angle is corrected in combination with the correction direction to obtain the correction angle.

[0082] As an example, the formula for calculating the correction angle is: ;in, To correct the angle; The rotation angle; The sign for the direction of deviation; This is the angle deviation.

[0083] By adjusting the rotation angle in the opposite direction of the deviation, when the deviation direction is positive, the rotation angle is appropriately reduced, and when the deviation direction is negative, the rotation angle is appropriately increased to correct the rotation angle, obtain the correction angle, and reduce interference caused by measurement accuracy.

[0084] It should be noted that the above-mentioned rotation angle correction process does not include the correction of the rotation angle at the endpoints. That is, when the guide voltage is 0V and 12V, since the damper actuator is in a special state of being fully open and closed, no correction is required.

[0085] Step S3: Based on the ideal linear relationship between the guide voltage and the rotation angle, and combined with the correction angle, correct the corresponding guide voltage. Then, based on the change relationship between the guide voltage and the correction angle, analyze the error of the guide voltage before and after correction at each rotation angle to obtain the measurement accuracy coefficient. Based on the change relationship between the corrected guide voltage and the actuation voltage, and combined with the measurement accuracy coefficient, obtain the measurement confidence level at each rotation angle. Based on the measurement confidence level, analyze the fitting error of the fitted linear relationship between the actuation voltage and the rotation angle to evaluate the linearity of the damper actuator.

[0086] Considering that the conductive voltage provides the control source for the rotation of the actuator, after obtaining the correction angle, this embodiment of the invention can further analyze the theoretical conductive voltage at the corresponding correction angle based on the ideal linear relationship between the conductive voltage and the rotation angle, thereby analyzing and correcting the conductive voltage, correcting the error caused by the imprecise adjustment of the conductive potentiometer's resistance, and preparing for subsequent analysis and measurement accuracy coefficient.

[0087] In one embodiment of the present invention, the model slope is first determined based on the maximum voltage of the conductive potentiometer and the maximum rotation angle of the actuator, and an ideal linear model between the conductive voltage and the rotation angle is fitted; specifically, the maximum output voltage U of the conductive potentiometer under ideal conditions and the maximum rotation angle of the actuator are obtained. ;Will As the model slope, the ideal linear model L is fitted: ,in It can be regarded as the independent variable (rotation angle) of an ideal linear model. This can be considered as the dependent variable (conducting voltage) of an ideal linear model; then the model parameters Cd = (kL, dL) of the ideal linear model can be obtained, where kL = dL = 0 represents the slope of the line, and dL = 0 represents the intercept of the line.

[0088] Then, a second linear relationship model L2 between the conductive voltage and the correction angle is fitted. The fitting method is the same as that for the first linear relationship model, and will not be repeated here. The model parameters (k2, d2) are obtained, where k2 is the slope of the line and d2 is the intercept of the line. Then, the data points in the second linear relationship model L2 are mapped to the ideal linear model through rotation and translation operations, thereby obtaining each data point in the second linear relationship model. The corresponding correction data points in the ideal linear model Specifically, first rotate L2. An angle is chosen such that the slope of L2 matches that of the straight line in the ideal linear model, where... The angle between the slopes of the lines corresponding to the ideal linear model L2 is used to rotate model L2. Then, model L2 is translated using the linear intercept between the two models to align model L2 with the ideal linear model. This maps the data points in the second linear relationship model L2 to the ideal linear model. This is an existing technique and will not be described in detail here.

[0089] In another embodiment of the present invention, the implementer may also directly adjust the correction angle. Substituting into the ideal linear model L, the corrected conductive voltage is obtained. To obtain the corresponding data points It should be noted that rotational correction is an existing technique well-known to those skilled in the art, and will not be elaborated upon further. and Both can represent correction angles The corresponding data points.

[0090] After obtaining the corresponding correction voltage of the conductive plastic at each correction angle, the error of the conductive plastic voltage before and after correction at each rotation angle can be analyzed by combining the relationship between the conductive plastic voltage and the correction angle, and the measurement accuracy coefficient can be obtained. The measurement accuracy coefficient reflects the measurement accuracy of the conductive plastic potentiometer and also reflects whether the conductive plastic potentiometer is in good condition, which prepares for the subsequent accurate evaluation of linearity.

[0091] Preferably, in one embodiment of the present invention, considering that the deviation between the pre-correction conductive voltage and the corresponding conductive voltage in the ideal linear model, and the deviation between the corrected conductive voltage and the corresponding conductive voltage in the second linear relationship model, can reflect the abnormal situation of the conductive potentiometer at each correction angle, that is, the change of conductive voltage cannot accurately affect or reflect the change of rotation angle, and the measurement accuracy of the conductive potentiometer for rotation angle is low; and considering that there are special cases for rotation angle, at which time the conductive voltage should be in the extreme state of 0V or 12V, the endpoint value of rotation angle can be distinguished from the other interval values ​​to evaluate the measurement accuracy coefficient of the conductive potentiometer, and the endpoint value can also be used to verify and evaluate the measurement performance of the conductive potentiometer; based on this, the method for obtaining the measurement accuracy coefficient includes:

[0092] A second linear relationship model between the plastic guide voltage and the correction angle is fitted; the slope of the model is determined based on the maximum voltage of the plastic guide potentiometer and the maximum rotation angle of the actuator, and an ideal linear model between the plastic guide voltage and the rotation angle is fitted.

[0093] At each correction angle, the difference between the pre-correction conductive voltage and the corresponding conductive voltage in the ideal linear model is taken as the ideal deviation, and the difference between the corrected conductive voltage and the corresponding conductive bias voltage in the second linear relationship model is taken as the actual deviation.

[0094] For each interval endpoint of the rotation angle, the first variation error is obtained based on the absolute value of the difference between the ideal deviation and the actual deviation, and the magnitude of the ideal deviation; the negative correlation mapping result of the first variation error is used as the measurement accuracy coefficient.

[0095] For each other interval value of the rotation angle, the measurement accuracy coefficient is obtained based on the magnitude of the ideal deviation and the actual deviation, combined with the deviation between the two.

[0096] As an example, firstly, a second linear relationship model L2 between the conductive voltage and the correction angle is fitted. The fitting method is the same as that for the first linear relationship model, and will not be repeated here. The model parameters (k2, d2) are obtained, where k2 is the slope of the line and d2 is the intercept of the line. Then, an ideal linear model between the conductive voltage and the rotation angle is fitted. Then, the difference is measured by the absolute value of the difference, and the ideal deviation and actual deviation under each correction angle are obtained.

[0097] For each endpoint of the rotation angle interval, the formula for calculating the measurement accuracy coefficient t is:

[0098] ;in, It is a linear normalization function; This is the deviation from the ideal. The actual deviation is denoted by t. In the formula, the smaller the ideal deviation and the closer the ideal deviation is to the actual deviation, the smaller the normalized value and the larger the measurement accuracy coefficient, indicating that the measurement effect of the conductive potentiometer is better. When t is less than or equal to 0.95, the conductive potentiometer needs to be calibrated.

[0099] For the remaining non-interval endpoint values ​​of the rotation angle, the formula for calculating the measurement accuracy coefficient t is:

[0100] ;in, It is an exponential function with the natural constant e as the base; This represents the actual deviation. The ideal deviation is denoted by ; where, the closer the actual deviation is to the actual deviation, and the smaller both the ideal deviation and the actual deviation are, the smaller the exponential function value and the larger the measurement accuracy coefficient, indicating that the measurement effect of the conductive potentiometer is better.

[0101] Furthermore, considering that the conductive voltage of the conductive potentiometer will affect the execution voltage of the actuator, and that the execution voltage of the actuator will also be affected when the conductive potentiometer is abnormal, this embodiment of the invention will further combine analysis and correction of the relationship between the conductive voltage and the execution voltage to obtain the measurement confidence level at each rotation angle.

[0102] Preferably, in one embodiment of the present invention, the method for obtaining the confidence level includes:

[0103] A third linear relationship model is fitted between the plastic guide voltage and the execution voltage. At each rotation angle, the corrected plastic guide voltage is input into the third linear relationship model to obtain the fitted execution voltage. The difference between the fitted execution voltage and the execution voltage recorded at the corresponding rotation angle is negatively correlated and mapped. The negative correlation mapping result is used as the measurement reference weight at each rotation angle. The measurement accuracy coefficient is weighted using the measurement reference weight, and the weighted result is used as the measurement confidence level at each rotation angle.

[0104] As an example, firstly, a third linear relationship model L3 is fitted between the corrected guide voltage and the execution voltage. The fitting method is the same as that of the first linear relationship model, so it will not be repeated here. Then, the corrected guide voltage at each rotation angle is input into the third linear relationship model to obtain the fitted execution voltage. Next, the difference is measured using the absolute value of the difference. If the difference between the fitted execution voltage and the actual execution voltage at the corresponding rotation angle is larger, it indicates that the measurement confidence of the data point is lower. Therefore, the absolute value of the difference is reciprocal to perform a negative correlation mapping, so that the larger the difference, the smaller the measurement reference weight. Finally, the measurement reference weight is multiplied and combined with the corresponding measurement accuracy coefficient, and the product is used as the measurement confidence at the corresponding rotation angle.

[0105] After obtaining the measurement confidence level for each rotation angle, this embodiment of the invention will analyze the fitting error of the linear relationship between the actuation voltage and the rotation angle based on the measurement confidence level, and evaluate the linearity of the damper actuator.

[0106] Preferably, in one embodiment of the present invention, considering that the fitting error of the first linear relationship model corresponding to the actuation voltage and rotation angle can reflect the linearity of the actuator, the larger the fitting error, the worse the linearity; and considering that the measurement confidence reflects the confidence reference or importance of each rotation angle and actuation voltage corresponding to the data point for evaluating the fitting error, which can help to accurately evaluate the linearity of the damper actuator; therefore, the method for evaluating the linearity of the damper actuator includes:

[0107] When calculating the deviation of each data point corresponding to the voltage-rotation angle from the first linear relationship model, the measurement confidence level is used as the weight of the corresponding deviation, and the weighted sum of all deviations is used as the fitting error; when the fitting error is greater than the preset threshold, the linearity of the damper actuator is determined to be poor.

[0108] It should be noted that the acquisition of fitting error is a well-known existing technology in the art and will not be described in detail here; in one embodiment of the present invention, the preset threshold is set to 5%, but the implementer may also customize it.

[0109] One embodiment of the present invention also proposes a linearity detection device for automotive air conditioning damper actuators. The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the linearity detection method for automotive air conditioning damper actuators.

[0110] In summary, this invention utilizes a conductive potentiometer to measure the rotation angle of a damper actuator; then, based on the angular fluctuation range of each rotation angle, it determines the voltage fluctuation range of the actuator voltage; further, based on the actuator voltage recorded under each rotation angle fluctuation range and its deviation relative to the voltage fluctuation range, combined with the angular fluctuation deviation and the relationship between the actuator voltage and the rotation angle, it obtains the correction angle for each rotation angle; then, combining the ideal linear relationship between the conductive voltage and the rotation angle, it corrects the corresponding conductive voltage, and, combining the relationship between the conductive voltage and the correction angle, analyzes the error of the conductive voltage before and after correction at each rotation angle, obtaining the measurement accuracy coefficient; then, combining the relationship between the corrected conductive voltage and the actuator voltage, it obtains the measurement confidence level for each rotation angle; finally, based on the measurement confidence level, it analyzes the fitting error of the linear relationship between the actuator voltage and the rotation angle, evaluating the linearity of the damper actuator. This invention improves the accuracy of linearity detection of damper actuators by analyzing the relationship between conductive voltage, rotation angle, and actuator voltage, thus evaluating the measurement accuracy of the conductive potentiometer.

[0111] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0112] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

Claims

1. A method for detecting the linearity of automotive air conditioning damper actuators, characterized in that, The method includes: The rotation angle of the damper actuator was measured using a conductive potentiometer; at each rotation angle, the angle fluctuation deviation was obtained, and the conductive voltage of the conductive potentiometer and the actuation voltage of the damper actuator were recorded. At each rotation angle, the angle fluctuation range is determined based on the angle fluctuation deviation, and the voltage fluctuation range of the execution voltage is determined by combining the relationship between the execution voltage and the rotation angle. Based on the execution voltage recorded under the angle fluctuation range of each rotation angle, and the deviation of the execution voltage relative to the voltage fluctuation range, the correction angle for each rotation angle is obtained by combining the angle fluctuation deviation and the relationship between the execution voltage and the rotation angle. Based on the ideal linear relationship between the guide voltage and the rotation angle, and combined with the correction angle, the corresponding guide voltage is corrected. Furthermore, by combining the change relationship between the guide voltage and the correction angle, the error of the guide voltage before and after correction at each rotation angle is analyzed to obtain the measurement accuracy coefficient. Based on the change relationship between the corrected guide voltage and the actuation voltage, and combined with the measurement accuracy coefficient, the measurement confidence level at each rotation angle is obtained. Based on the measurement confidence level, the fitting error of the fitted linear relationship between the actuation voltage and the rotation angle is analyzed to evaluate the linearity of the damper actuator. Fit the first linear relationship model between the execution voltage and the rotation angle; The method for obtaining the correction angle includes: At each rotation angle, based on the execution voltage recorded within the angle fluctuation range, and the difference between the execution voltage and the execution voltage within the voltage fluctuation range, the voltage deviation and deviation direction of the execution voltage are obtained. A local linear relationship model is established between the rotation angle within the angle fluctuation range and the execution voltage recorded within the voltage fluctuation range. Based on the difference between the corresponding model parameters of the first linear relationship model and the local linear relationship model, and combined with the angle fluctuation deviation and the voltage deviation, the angle deviation under the corresponding rotation angle is obtained. At each rotation angle, the opposite direction of the deviation direction is taken as the angle correction direction. Based on the correction direction and the angle deviation, the deviation correction amplitude is determined, and the rotation angle is corrected in combination with the correction direction to obtain the correction angle.

2. The linearity detection method for automotive air conditioning damper actuators according to claim 1, characterized in that, The method for obtaining the angle fluctuation deviation includes: Under the same operating voltage, the instantaneous rotation angle of the damper actuator is measured using a conductive potentiometer, and the random error is obtained based on the fluctuation of the instantaneous rotation angle. The angle fluctuation deviation is obtained by combining the random error and the systematic error during measurement.

3. The linearity detection method for automotive air conditioning damper actuators according to claim 1, characterized in that, The methods for obtaining the angle fluctuation range and the voltage fluctuation range include: By floating the angle fluctuation deviation upwards and downwards for each rotation angle, the corresponding angle fluctuation range is obtained; Substitute the upper and lower limits of the angle within the angle fluctuation range into the first linear relationship model to determine the upper and lower limits of the execution voltage, thus obtaining the voltage fluctuation range of the execution voltage.

4. The linearity detection method for automotive air conditioning damper actuators according to claim 1, characterized in that, The method for obtaining the voltage deviation and the direction of the deviation includes: Within the angular fluctuation range of each rotation angle, the execution voltage recorded at the upper limit of the angle is taken as the upper limit of the recorded voltage, and the execution voltage recorded at the lower limit of the angle is taken as the lower limit of the recorded voltage. The voltage deviation is determined by combining the difference between the upper limit of the recorded voltage and the upper limit of the voltage fluctuation range, and the difference between the lower limit of the recorded voltage and the lower limit of the voltage fluctuation range. The deviation direction is determined based on the relationship between the upper limit of the recorded voltage and the upper limit of the voltage fluctuation range, and the relationship between the lower limit of the recorded voltage and the lower limit of the voltage fluctuation range.

5. The linearity detection method for automotive air conditioning damper actuators according to claim 1, characterized in that, The method for obtaining the angle deviation includes: The model parameters are two-dimensional data consisting of the slope and intercept in the linear relationship model; the Euclidean norm between the corresponding model parameters of the first linear relationship model and the local linear relationship model is used as the first angle error; the angle fluctuation deviation and the voltage deviation under the corresponding rotation angle are fused to obtain the second angle error; the first angle error and the second angle error are fused to obtain the angle deviation weight under the corresponding rotation angle; the angle fluctuation deviation is weighted using the angle deviation weight to obtain the angle deviation under the corresponding rotation angle.

6. The method for detecting the linearity of automotive air conditioning damper actuators according to claim 1, characterized in that, The method for obtaining the measurement accuracy coefficient includes: Fit a second linear relationship model between the plastic guide voltage and the correction angle; determine the model slope based on the maximum voltage of the plastic guide potentiometer and the maximum rotation angle of the actuator, and fit an ideal linear model between the plastic guide voltage and the rotation angle. At each correction angle, the difference between the pre-correction conductive voltage and the corresponding conductive voltage in the ideal linear model is taken as the ideal deviation, and the difference between the corrected conductive voltage and the corresponding conductive bias voltage in the second linear relationship model is taken as the actual deviation. For each interval endpoint of the rotation angle, the first variation error is obtained based on the absolute value of the difference between the ideal deviation and the actual deviation, and the magnitude of the ideal deviation; the negative correlation mapping result of the first variation error is used as the measurement accuracy coefficient. For each other interval value of the rotation angle, the measurement accuracy coefficient is obtained based on the magnitude of the ideal deviation and the actual deviation, combined with the deviation between the two.

7. The linearity detection method for automotive air conditioning damper actuators according to claim 1, characterized in that, The method for obtaining the measurement confidence level includes: A third linear relationship model is fitted between the corrected guide voltage and the execution voltage. At each rotation angle, the corrected guide voltage is input into the third linear relationship model to obtain the fitted execution voltage. The difference between the fitted execution voltage and the execution voltage recorded at the corresponding rotation angle is negatively correlated and mapped. The negative correlation mapping result is used as the measurement reference weight at each rotation angle. The measurement accuracy coefficient is weighted using the measurement reference weight, and the weighted result is used as the measurement confidence level at each rotation angle.

8. The linearity detection method for automotive air conditioning damper actuators according to claim 3, characterized in that, Methods for evaluating the linearity of damper actuators include: When calculating the deviation of each data point corresponding to the voltage-rotation angle from the first linear relationship model, the measurement confidence level is used as the weight of the corresponding deviation, and the weighted sum of all deviations is used as the fitting error; when the fitting error is greater than the preset threshold, the linearity of the damper actuator is determined to be poor.

9. A linearity testing device for an automotive air conditioning damper actuator, the device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the linearity detection method for automotive air conditioning damper actuators as described in any one of claims 1 to 8.

Images