A testing method and system for a non-contact sensor of an automobile tailgate

Abstract

The present application relates to a test method and system for a non-contact sensor of an automobile tailgate. The method includes: S1: Timing and controlling a first antenna to send a first detection signal; S2: Timing and controlling a second antenna to receive the first detection signal to generate a first feedback signal, and taking the difference between the value of the first detection signal and the value of the first feedback signal as a detection difference; S3: Calculating the average value of n detection differences within the nearest set time period as a detection average value; S4: Calculating the difference between the detection average value and a comparison value. If the difference is greater than a preset first fluctuation value and less than a preset second fluctuation value, the detection average value is used to update the comparison value. The present application can reduce the adverse effects caused by the non-contact sensor being interfered by the external environment.

Description

Technical Field

[0001] This application relates to the field of automotive tailgate sensors, and particularly to a test method and system for a non-contact sensor of an automotive tailgate. Background Art

[0002] The trunk of a vehicle is equipped with a tailgate. For some vehicle models, an electric actuator is provided at the tailgate so that the tailgate can be controlled by an electrical signal, thereby realizing the function of an electric tailgate.

[0003] During the process of opening or closing the electric tailgate, the electric tailgate will automatically execute a fixed opening or closing program. If there is no recognition of foreign objects around the electric tailgate, when a foreign object falls into the moving range of the electric tailgate, the electric tailgate may hit the foreign object, which may damage the electric tailgate or the foreign object. The foreign object can be a person walking into the moving area of the electric tailgate. Therefore, for some vehicle models, non-contact sensors are provided at the edge of the trunk opening or on the vehicle body of the trunk opening to identify whether there is a human body in a specific area.

[0004] In the prior art, generally two substantially parallel antennas are provided to detect a human body. The processor can detect the capacitance value between the two antennas through the two antennas. If a person enters the detection area, the capacitance value will change. By identifying the capacitance value change waveform corresponding to the human body, it is measured whether a human body enters the moving area of the electric tailgate.

[0005] In the process of implementing the above prior art, the inventor found that in addition to the human body changing the capacitance value between the antennas, the environment where the vehicle is located will also change the comparison value of the capacitance value between the antennas. For example, the background waveforms of the capacitance values between the antennas are different when the vehicle is parked in an open environment and when it is parked beside a crowded road, resulting in a change in the comparison value of the capacitance value. In particular, the vehicles in the vicinity of the automotive tailgate and the electromagnetic waves emitted by them will cause fluctuations in the comparison value of the capacitance value between the antennas, which easily leads to errors in the result of the processor identifying a human body. Summary of the Invention

[0006] In order to reduce the adverse effects caused by the interference of the existing non-contact sensor by the external environment, this application provides a test method and system for a non-contact sensor of an automotive tailgate.

[0007] In a first aspect, this application provides a test method for a non-contact sensor of an automotive tailgate, adopting the following technical solution:

[0008] A test method for a non-contact sensor of an automotive tailgate, based on a first antenna and a second antenna, the method includes the following steps:

[0009] S1: Timingly control the first antenna to send a first detection signal;

[0010] S2: Timingly control the second antenna to receive the first detection signal to generate a first feedback signal, and the difference between the value of the first detection signal and the value of the first feedback signal is the detection difference;

[0011] S3: Take n of the detection differences within the nearest set time period and calculate the average value as the detection average value;

[0012] S4: Calculate the difference between the detection average value and the comparison value. If the difference is greater than the preset first fluctuation value and less than the preset second fluctuation value, then use the detection average value to update the comparison value.

[0013] By adopting the above technical solution, when no one passes by the rear door of the vehicle, first the first antenna sends the first detection signal, and then based on the second antenna, a first feedback signal is generated. At this time, the detection difference is the background noise of the non-contact sensor at the rear door of the vehicle when no one is present. The background noise can include two parts: the attenuation of the electromagnetic signal by the environment and the frequency response. Some environments have a large impact on the attenuation of the electromagnetic signal, and some environments can have a large impact on the frequency response of the electromagnetic signal. At this time, using n detection differences to calculate the detection average value can fully consider these two parts of the attenuation of the electromagnetic signal by the environment and the frequency response, and then update the comparison value after the detection average value meets the above conditions for use in the comparison process of the non-contact sensor during normal operation, reducing the adverse effects caused by the non-contact sensor being interfered by the external environment and being beneficial to improving the test and debugging effect.

[0014] Preferably, in step S2, it further includes:

[0015] S21: Transform the first feedback signal to obtain a second frequency set, and the weighted average value of a set number of frequency components in the second frequency set is the value of the first feedback signal;

[0016] S22; The value of the first detection signal is the first frequency value, and the detection difference is obtained by subtracting the weighted average value from the first frequency value.

[0017] By adopting the above technical solution, a time-domain to frequency-domain transformation is performed on the first feedback signal to obtain multiple frequency components and calculate their weighted average values. Thus, not only the change in the frequency value is calculated, but also the values corresponding to the frequencies near the center frequency point are calculated, thereby highlighting the interference factor of the frequency response of the electromagnetic signal by the environment and being beneficial to improving the test and debugging effect.

[0018] Preferably, in step S2, it further includes:

[0019] S23: Sequentially change the value of the first frequency value according to the preset frequency data set, and call S21 and S22 to calculate and obtain the corresponding number of detection differences;

[0020] S24: Calculate a composite detection difference using a preset weighting value corresponding to the frequency dataset according to the detection difference corresponding to the quantity, and update the detection difference output in the step S2 with the composite detection difference.

[0021] By adopting the above technical solution, the frequency value of the first detection signal is changed to obtain a plurality of first feedback signals corresponding to different frequencies, and then a plurality of detection differences corresponding to different frequencies are measured and calculated, thereby taking into account the change in the frequency of the first detection signal; as the working time of the vehicle becomes longer and the materials of the first antenna and the second antenna age, frequency offset is likely to occur. At this time, the interference factor of the influence of the environment on the first detection signal emitted by the first antenna is highlighted, which is beneficial to improving the test and debugging effect.

[0022] Preferably, the method further includes:

[0023] During the execution of the step S2, control the vehicle tailgate to open or close;

[0024] Alternatively, during the execution of the step S2, control the vehicle tailgate to open and close cyclically.

[0025] By adopting the above technical solution, when the vehicle tailgate moves, the electric actuator of the vehicle tailgate will generate electromagnetic interference, and especially when the vehicle tailgate changes its motion state, the electromagnetic interference is particularly large. In this case, calculating the detection difference can take into account the influence of the electromagnetic interference, thereby reducing the influence of the electromagnetic interference on the non-contact sensor.

[0026] Preferably, in the step S3, it further includes:

[0027] When the first antenna does not send the first detection signal, control the second antenna to receive the environmental signal to generate a second feedback signal, and record the value of the second feedback signal as a new detection difference.

[0028] By adopting the above technical solution, when there is no first detection signal, the second antenna can still receive the external electromagnetic signal. At this time, using the external electromagnetic signal as a new detection difference to participate in the calculation, the influence of the external electromagnetic signal in the environment can be taken into account when calculating the detection average value, thereby reducing the influence of the external electromagnetic signal in the environment on the non-contact sensor.

[0029] In a second aspect, the present application provides a test system for a non-contact sensor of a vehicle tailgate, adopting the following technical solution:

[0030] A test system for a non-contact sensor of a vehicle tailgate, based on a first antenna, a second antenna, and a controller, the controller further includes the following modules:

[0031] A timing control module for timing and controlling the first antenna to send a first detection signal;

[0032] A timing receiving module, which is data-connected to the timing control module, for timing and controlling the second antenna to receive the first detection signal to generate a first feedback signal, and the difference between the value of the first detection signal and the value of the first feedback signal is used as a detection difference;

[0033] An average calculation module, which is data-connected to the timing receiving module, for taking n of the detection differences within a set time period recently and calculating an average value as a detection average value;

[0034] A comparison and update module, which is data-connected to the average calculation module, for calculating the difference between the detection average value and a comparison value. If the difference is greater than a preset first fluctuation value and less than a preset second fluctuation value, the detection average value is used to update the comparison value.

[0035] By adopting the above technical solution, when no one passes by the rear door of the vehicle, the timing control module makes the first antenna send a first detection signal, and the timing receiving module calculates a detection difference based on the first feedback signal generated by the second antenna. At this time, the detection difference is the background noise of the non-contact sensor at the rear door of the vehicle when no one is present. The background noise can include two parts: the attenuation of the electromagnetic signal by the environment and the frequency response. Some environments have a greater impact on the attenuation of the electromagnetic signal, and some environments can have a greater impact on the frequency response of the electromagnetic signal. At this time, the average calculation module calculates a detection average value using n detection differences, which can fully consider these two parts: the attenuation of the electromagnetic signal by the environment and the frequency response. The comparison and update module updates the comparison value after the detection average value meets the above conditions, which is used for the comparison process of the non-contact sensor during normal operation, reduces the adverse effects caused by the non-contact sensor being interfered by the external environment, and is conducive to improving the test and debugging effect.

[0036] Preferably, the timing receiving module further includes:

[0037] A weighted calculation unit for transforming the first feedback signal to obtain a second frequency set, and the weighted average value of a set number of frequency components in the second frequency set is the value of the first feedback signal;

[0038] A detection calculation unit, which is data-connected to the weighted calculation unit, for using the value of the first detection signal as a first frequency value, and then subtracting the weighted average value from the first frequency value to obtain a detection difference.

[0039] By adopting the above technical solution, the weighted calculation unit performs a time-domain to frequency-domain calculation on the first feedback signal, obtains multiple frequency components and calculates their weighted average value. The detection difference calculated by the detection calculation unit takes into account not only the change in the frequency value, but also the values corresponding to the frequencies near the center frequency point, thereby highlighting the interference factor of the environmental frequency response to the electromagnetic signal, which is conducive to improving the test and debugging effect.

[0040] Preferably, the timing receiving module further includes:

[0041] A frequency conversion test unit, which is data-connected to both the weighted calculation unit and the detection calculation unit, is used to sequentially change the value of the first frequency value according to a preset frequency data set, and call the weighted calculation unit and the detection calculation unit to calculate the corresponding number of detection differences;

[0042] A composite calculation unit, which is data-connected to the frequency conversion test unit, is used to calculate a composite detection difference according to the detection differences corresponding to the quantity using a preset weighted value corresponding to the frequency data set, and update the detection difference output in the step S2 with the composite detection difference.

[0043] By adopting the above technical solution, the frequency conversion test unit changes the frequency value of the first detection signal to obtain multiple first feedback signals in response to different frequencies, and then calculates multiple detection differences in response to different frequencies. The calculation result of the composite calculation unit takes into account the change in the frequency of the first detection signal; as the working time of the vehicle becomes longer and the materials of the first antenna and the second antenna age, frequency offset is likely to occur. At this time, the interference factor of the influence of the environment on the first detection signal emitted by the first antenna is highlighted, which is conducive to improving the test and debugging effect.

[0044] Preferably, the timing receiving module further includes:

[0045] A tailgate control unit, which is used to control the opening or closing of the vehicle tailgate; or, which is used to control the cyclic opening and closing of the vehicle tailgate.

[0046] By adopting the above technical solution, when the vehicle tailgate moves, the electric actuator of the vehicle tailgate will generate electromagnetic wave interference, and when the vehicle tailgate changes its motion state, the electromagnetic wave interference is particularly large. Calculating the detection difference under the action of the tailgate control unit can take into account the influence of the electromagnetic wave interference, thereby reducing the influence of the electromagnetic wave interference on the non-contact sensor.

[0047] Preferably, the average calculation module further includes:

[0048] A new recording unit is used to control the second antenna to receive an environmental signal to generate a second feedback signal when the first antenna does not send the first detection signal, and record the value of the second feedback signal as a new detection difference.

[0049] By adopting the above technical solution, when there is no first detection signal, the second antenna can still receive the external electromagnetic signal. The new recording unit uses the external electromagnetic signal as a new detection difference to participate in the calculation, and the calculated detection average value can take into account the influence of the external electromagnetic signal in the environment, thereby reducing the influence of the external electromagnetic signal in the environment on the non-contact sensor. Description of the Drawings

[0050] Figure 1 is a schematic flowchart of a method for testing a non-contact sensor for a vehicle tailgate in an embodiment of the present application;

[0051] Figure 2 is a system block diagram of a system for testing a non-contact sensor for a vehicle tailgate in an embodiment of the present application.

[0052] Reference numerals: 1, first antenna; 2, second antenna; 3, controller; 31, timing control module; 32, timing receiving module; 321, tailgate control unit; 322, weighted calculation unit; 323, detection calculation unit; 324, frequency conversion test unit; 325, composite calculation unit; 33, average calculation module; 331, new recording unit; 34, comparison and update module. Detailed Embodiments

[0053] The following will Figure 1-2 further describe the present application in detail.

[0054] An embodiment of the present application discloses a method for testing a non-contact sensor for a vehicle tailgate. Referring to Figure 1 , a method for testing a non-contact sensor for a vehicle tailgate is based on a first antenna 1, a second antenna 2, and a controller 3. The lengths of the first antenna 1 and the second antenna 2 can be approximately equal, and they are both horizontally arranged on the vehicle body shell below the vehicle tailgate. A spacing within a set range is provided between the first antenna 1 and the second antenna 2. The controller 3 can adopt a single-chip microcomputer system, which can output a PWM square wave with a set frequency to the first antenna 1 and also has an acquisition module to acquire the electrical signal on the second antenna 2. The method includes the following steps:

[0055] S1: Timing control the first antenna 1 to send a first detection signal. The controller 3 has a built-in timer, and the timer can periodically send a PWM square wave. The frequency value of the PWM square wave is the first frequency value or other frequency values.

[0056] S2: Timing control is performed such that the second antenna 2 receives the first detection signal to generate a first feedback signal, and the difference between the value of the first detection signal and the value of the first feedback signal is the detection difference. During the process of the first antenna 1 continuously transmitting the first detection signal, the second antenna 2 generates the first feedback signal based on electromagnetic induction. The acquisition module acquires the first feedback signal, and the first feedback signal is voltage waveform data in the time domain dimension. The controller 3 can read the first feedback signal. The value of the first detection signal can be the energy value of the first detection signal, and there is a positive correlation between the energy value and the voltage value. The larger the value in the voltage waveform data, the larger the energy value. In some other cases, the value of the first detection signal can be the frequency value extracted from the frequency distribution data after the Fourier transform of the voltage waveform data. The extraction method can be the weighted average value weighted by the product value of the set frequency band and its components. In a microcontroller, the algorithm for Fourier transform can adopt the fast FFT algorithm.

[0057] S3: Calculate the average value of n detection differences within the nearest set time period as the detection average value. The set time period can be the nearest 3 hours, and n can be 20. Take the 20 detection differences detected at the average time interval within the nearest 3 hours and calculate the average value as the detection average value. In the case of a test environment, when the first antenna 1 does not transmit the first detection signal, the controller 3 controls the second antenna 2 to receive the environmental signal to generate a second feedback signal, and records the value of the second feedback signal as a new detection difference. At this time, the new detection difference is the detected environmental background interference. When there is no first detection signal, the second antenna 2 can also receive the electromagnetic signal existing in the environmental background. Generating a new detection difference to participate in the calculation means taking the external electromagnetic signal as a new detection difference to participate in the calculation. Calculating the detection average value can take into account the influence of the external electromagnetic signal in the environment, thereby reducing the influence of the external electromagnetic signal in the environment on the non-contact sensor.

[0058] S4: Calculate the difference between the detected average value and the comparison value. If the difference is greater than a preset first fluctuation value and less than a preset second fluctuation value, update the comparison value with the detected average value. The comparison value used in the first calculation is the judgment threshold of the vehicle control system without using the test method described in this embodiment. The vehicle control system determines whether there is someone behind the vehicle based on the relationship between the actual detected value and the comparison value. If it is determined that there is someone behind the vehicle, the vehicle tailgate is opened or closed. If it is determined that there is no one behind the vehicle, the action of the vehicle tailgate is not controlled. If the comparison value is not changed by using the test method described in this embodiment, that is, the comparison value remains fixed all the time, when no one passes through the detection area, it will be interfered by the environment, such as weak external electromagnetic wave interference, which may cause the vehicle tailgate to open or close incorrectly. After adopting the test method described in this embodiment, the comparison value will change according to the change of the environment. If the environmental interference can have a certain degree of influence, this influence will be recorded in the comparison value. When a person enters the detection area, the environmental interference can be distinguished from the change brought by the person, reducing the adverse impact caused by the external environmental interference on the non-contact sensor and facilitating the improvement of the test and debugging effect.

[0059] In some other cases, the following steps can be added in step S2: Control the vehicle tailgate to open or close, or it can be in the test mode: Control the vehicle tailgate to open and close continuously in a cycle. When the vehicle tailgate moves, the electric actuator of the vehicle tailgate will generate electromagnetic wave interference, and especially when the vehicle tailgate changes its motion state, the electromagnetic wave interference is particularly large. In this case, calculating the detection difference can take into account the influence of the electromagnetic wave interference, thereby reducing the influence of the electromagnetic wave interference on the non-contact sensor.

[0060] In some other cases, based on controlling the vehicle tailgate, the following steps can also be added in step S2: S21: Transform the first feedback signal to obtain a second frequency set. The weighted average value of a set number of frequency components in the second frequency set is the value of the first feedback signal.

[0061] S22: The value of the first detection signal is the first frequency value. The detection difference is obtained by subtracting the weighted average value from the first frequency value. For example, if the first frequency value is 500 KHZ and the weighted average value is 497 KHZ, the detection difference is 3 KHZ.

[0062] S23: Sequentially change the value of the first frequency value according to a preset frequency data set, and call S21 and S22 to calculate the corresponding number of detection differences. For example, the preset frequency data set includes 300 KHZ, 450 KHZ, 500 KHZ, and 550 KHZ, and the corresponding number is 4. Then the calculated weighted average values can be 301 KHZ, 448 KHZ, 503 KHZ, and 547 KHZ, and the calculated detection differences can be 1 KHZ, -2 KHZ, 3 KHZ, and -3 KHZ.

[0063] S24: Calculate a composite detection difference using a preset weighting value corresponding to the frequency dataset according to the detection difference corresponding to the quantity, and update the detection difference output in step S2 with the composite detection difference. The weighting values can be 1, 1, 1, and 1, and the composite detection difference can be -1 KHZ. If the comparison value is -500 KHZ, the composite detection difference can be used to update the comparison value.

[0064] In some other cases, the capacitance value detection between the first antenna 1 and the second antenna 2 can be used to replace the frequency detection. The steps of using capacitance value detection are simpler than those of using frequency detection, but the dimensions available for analysis of the capacitance value are fewer than those of frequency analysis. Compared with the steps of using capacitance value detection, the steps of using frequency detection perform a time-domain to frequency-domain transformation on the first feedback signal, obtain multiple frequency components and calculate their weighted average values, thereby not only calculating the change in the frequency value but also calculating the values corresponding to the frequencies near the center frequency point, thus highlighting the interference factor of the environmental frequency response to the electromagnetic signal. Adding multiple changes in the frequency value to the first detection signal in the steps of using frequency detection to obtain multiple first feedback signals responsive to different frequencies can calculate multiple detection differences responsive to different frequencies. As the working time of the vehicle increases and the materials of the first antenna 1 and the second antenna 2 age, frequency shift is likely to occur. At this time, the detection differences responsive to different frequencies can highlight the interference factor of the environment's influence on the first detection signal emitted by the first antenna 1, which is beneficial to improving the test and debugging effect.

[0065] The implementation principle of the embodiment of this application is as follows: When no one passes by the tailgate of the vehicle, there will be background interference in the environment where the vehicle is located. The interference sources may include floating foreign objects, passing metal objects, other vehicles passing by the vehicle with electromagnetic wave sources on them, or welding equipment that can generate strong electromagnetic fields. In order to enable the non-contact sensor to accurately identify a person passing by the tailgate of the vehicle in the above background interference, the controller 3 first controls the first antenna 1 to send a first detection signal. During the continuous emission of the first detection signal, the controller 3 generates a first feedback signal based on the electrical signal received by the second antenna 2. The first feedback signal can be a voltage signal or can be converted into a capacitance value. After calculation by the controller 3, a detection difference is obtained. At this time, the detection difference is the background noise of the non-contact sensor at the tailgate of the vehicle when no one is present. The background noise includes two components: the attenuation of the electromagnetic signal by the environment and the frequency response to the electromagnetic signal. When a non-metal object passes by the rear of the vehicle, the attenuation of the electromagnetic signal is large. When a passive metal object passes by the rear of the vehicle, the frequency response to the electromagnetic signal is large. When an active metal object passes by the rear of the vehicle, it may increase the frequency of the electromagnetic wave received on the second antenna 2. At this time, n detection differences are used to calculate the detection average value, which can fully consider the two parts of the attenuation of the electromagnetic signal by the environment and the frequency response. Then, when the detection average value meets the above conditions, the comparison value is updated and used in the comparison process of the non-contact sensor during normal operation, reducing the adverse effects caused by the non-contact sensor being interfered by the external environment and facilitating the improvement of the test and debugging effect.

[0066] The embodiment of this application also discloses a test system for a non-contact sensor of an automobile tailgate. Refer to Figure 2 , a test system for a non-contact sensor of an automobile tailgate is based on the first antenna 1, the second antenna 2, and the controller 3. The controller 3 further includes the following modules:

[0067] A timing control module 31, configured to control the first antenna 1 to send a first detection signal at regular intervals.

[0068] The timing receiving module 32 is connected to the timing control module 31 for data, and is used to control the second antenna 2 to receive the first detection signal at regular intervals to generate a first feedback signal. The detection difference is based on the difference between the value of the first detection signal and the value of the first feedback signal. The timing receiving module 32 further includes: a tailgate control unit 321 for controlling the opening or closing of the vehicle tailgate; or for controlling the cyclic opening and closing of the vehicle tailgate. A weighted calculation unit 322 for transforming the first feedback signal to obtain a second frequency set, and the weighted average of a set number of frequency components in the second frequency set is the value of the first feedback signal. A detection calculation unit 323 is connected to the weighted calculation unit 322 for data, and is used to take the value of the first detection signal as the first frequency value, and then subtract the weighted average from the first frequency value to obtain the detection difference. A frequency conversion test unit 324 is connected to both the weighted calculation unit 322 and the detection calculation unit 323 for data, and is used to sequentially change the value of the first frequency value according to a preset frequency data set, and call the weighted calculation unit 322 and the detection calculation unit 323 to calculate and obtain a corresponding number of detection differences. A composite calculation unit 325 is connected to the frequency conversion test unit 324 for data, and is used to calculate a composite detection difference according to the corresponding detection differences using a preset weighted value corresponding to the frequency data set, and update the detection difference output in step S2 with the composite detection difference.

[0069] The average calculation module 33 is connected to the timing receiving module 32 for data, and is used to calculate the average value of n detection differences within the nearest set time period as the detection average value. The average calculation module 33 may further include a new record unit 331. The new record unit 331 is used to control the second antenna 2 to receive the ambient signal to generate a second feedback signal when the first antenna 1 does not send the first detection signal, and record the value of the second feedback signal as a new detection difference.

[0070] The comparison and update module 34 is connected to the average calculation module 33 for data, and is used to calculate the difference between the detection average value and the comparison value. If the difference is greater than a preset first fluctuation value and less than a preset second fluctuation value, the detection average value is used to update the comparison value.

[0071] The above are all the preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A test method for a non-contact sensor of an automobile tailgate, based on a first antenna (1) and a second antenna (2), characterized in that: The method includes the following steps: S1: Timingly control the first antenna (1) to send a first detection signal; S2: Timingly control the second antenna (2) to receive the first detection signal to generate a first feedback signal, and based on the difference between the value of the first detection signal and the value of the first feedback signal as the detection difference; S3: Take the average value of n of the detection differences in the most recent set time period as the detection average value, and further include: when the first antenna (1) does not send the first detection signal, control the second antenna (2) to receive the environmental signal to generate a second feedback signal, and record the value of the second feedback signal as a new detection difference; S4: Calculate the difference between the detection average value and the comparison value. If the difference is greater than a preset first fluctuation value and less than a preset second fluctuation value, then update the comparison value with the detection average value; In step S2, it further includes: S21: Transform the first feedback signal to obtain a second frequency set, and the weighted average value of a set number of frequency components in the second frequency set is the value of the first feedback signal; S22; The value of the first detection signal is the first frequency value, and the detection difference is obtained by subtracting the weighted average value from the first frequency value; In step S2, it further includes: S23: Sequentially change the value of the first frequency value according to a preset frequency data set, and call S21 and S22 to calculate and obtain the corresponding number of the detection differences; S24: Calculate a composite detection difference according to the detection differences corresponding to the quantity using a preset weighted value corresponding to the frequency data set, and update the detection difference output in step S2 with the composite detection difference.

2. The test method for a non-contact sensor of an automobile tailgate according to claim 1, wherein: The method further includes: During the execution of step S2, control the vehicle tailgate to open or close; Or, during the execution of step S2, control the vehicle tailgate to open and close cyclically.

3. A test system for a non-contact sensor of an automobile tailgate, based on a first antenna (1), a second antenna (2), and a controller (3), characterized in that: The controller (3) further includes the following modules: A timing control module (31) for timing control the first antenna (1) to send a first detection signal; A timing reception module (32), data-connected to the timing control module (31), for timing control the second antenna (2) to receive the first detection signal to generate a first feedback signal, and based on the difference between the value of the first detection signal and the value of the first feedback signal as the detection difference; An average calculation module (33), data-connected to the timing reception module (32), for taking the average value of n of the detection differences in the most recent set time period as the detection average value; A comparison update module (34), data-connected to the average calculation module (33), for calculating the difference between the detection average value and the comparison value. If the difference is greater than a preset first fluctuation value and less than a preset second fluctuation value, then update the comparison value with the detection average value; The timing reception module (32) further includes: A weighted calculation unit (322) for transforming the first feedback signal to obtain a second frequency set, and the weighted average value of a set number of frequency components in the second frequency set is the value of the first feedback signal; The detection calculation unit (323), which is data-connected to the weighted calculation unit (322), is configured to use the value of the first detection signal as the first frequency value, and then subtract the weighted average from the first frequency value to obtain a detection difference; The timing reception module (32) further includes: The frequency conversion test unit (324), which is data-connected to both the weighted calculation unit (322) and the detection calculation unit (323), is configured to sequentially change the value of the first frequency value according to a preset frequency data set, and call the weighted calculation unit (322) and the detection calculation unit (323) to calculate and obtain a corresponding number of the detection differences; The composite calculation unit (325), which is data-connected to the frequency conversion test unit (324), is configured to calculate a composite detection difference according to the detection differences corresponding to the quantity using a preset weighted value corresponding to the frequency data set, and update the detection difference output in the step S2 with the composite detection difference; The average calculation module (33) further includes: The new record unit (331), which is configured to control the second antenna (2) to receive an environmental signal to generate a second feedback signal when the first antenna (1) does not send the first detection signal, and record the value of the second feedback signal as a new detection difference.

4. The test system for a non-contact sensor of an automobile tailgate according to claim 3, characterized in that: The timing reception module (32) further includes: The tailgate control unit (321), which is configured to control the opening or closing of the vehicle tailgate; or, to control the cyclic opening and closing of the vehicle tailgate.

Images