Multi-wire harness test method and system

Abstract

The invention discloses a multi-wire-harness testing method and system, relates to the technical field of wire harness testing, solves the problem that an original testing mode is insufficient in comprehensiveness, and aims at a confirmed normal wire harness, a standard reaching test is carried out again, the attenuation rate associated with the corresponding wire harness is confirmed based on the signal characteristics of a corresponding wire harness transmission signal, and the testing accuracy is improved. And based on the numerical parameter of the attenuation rate, locking whether the corresponding normal wire harness is a standard wire harness or a substandard wire harness, and for the substandard wire harness, determining the current numerical representation associated with the corresponding wire harness by adopting a voltage interval and gradually increasing the internal voltage value of the wire harness, and based on the specific numerical representation result, determining the current numerical representation associated with the corresponding wire harness. And whether the corresponding substandard wire harness affects the normal use in the later period is determined, so that the overall evaluation effect between the wire harnesses is improved, the comprehensiveness of comprehensive test is guaranteed, and the effective test effect of the multiple wire harnesses can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of wire harness testing, and in particular to a multi-wire harness testing method and system. Background Art

[0002] By using an automated harness tester, test parameters and processes can be set by programming to automatically complete multiple test tasks. Automatic testing has the advantages of fast speed, high accuracy, and good repeatability. It is suitable for testing large-scale and complex harness production lines. The harness is placed in a simulated actual use environment, such as a high and low temperature test chamber, a vibration test bench, an electromagnetic shielding room, etc., for comprehensive performance testing; this method can more realistically reflect the performance of the harness in actual work, but the test equipment and environment requirements are high, and the cost is relatively high.

[0003] The application with publication number CN110850337A discloses a multi-harness test system, method, device and storage medium, which includes: computer equipment for storing, decomposing, receiving and analyzing test files; test files include basic data, production data and product test data; several harness test equipment for testing the technical parameters of the harness; several test boards and / or test fixtures for connecting the harness and the harness test equipment; the computer equipment is connected to the harness test equipment through a communication interface. In the test system, the computer equipment is connected to the test equipment through a communication interface, the test equipment is connected to the harness through a test board and / or a test fixture, and the test data of the harness test is analyzed to determine whether the test is qualified, so as to realize simultaneous testing of multiple products or joint testing of multiple test equipment, automatic processing of test data and test results, and high utilization rate of the test equipment, good expansibility and high efficiency. The invention can be widely used in the field of harness testing technology.

[0004] During the test process of the wiring harness, the numerical parameter performance of the corresponding wiring harness is used to evaluate whether the corresponding wiring harness is normal. However, the test results of the original wiring harness processing method are not comprehensive. When the wiring harness is tested, substandard wiring harnesses are evaluated based on the test results. However, such substandard wiring harnesses do not affect normal use in actual use, so there will be some errors in the test accuracy, and the comprehensiveness of the test is insufficient. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a multi-harness testing method and system, which solves the problem that the original testing method is not comprehensive enough.

[0006] To achieve the above objectives, the present invention is implemented by the following technical scheme: a multi-wire harness testing method, comprising the following steps: Step 1: Use a preset pulse signal to synchronously test multiple harnesses to identify whether there is a reflected signal at the signal transmitting end. Based on the identification result, lock the faulty harness and the normal harness. Then, based on the waveform difference between the pulse signal and the reflected signal in the abnormal harness, lock the abnormal cause of the faulty harness and display it. The specific method is as follows: S11, transmitting a preset pulse signal from the signal transmitting end to each wiring harness in the multi-wiring harness, identifying whether the corresponding wiring harness generates a reflection signal, if a reflection signal exists, marking the corresponding wiring harness as a faulty wiring harness, if no reflection signal exists, marking the corresponding wiring harness as a normal wiring harness; S12, confirm the signal waveforms of the pulse signal and the reflected signal, take the starting point of the signal waveform of the pulse signal as the calibration point, take the amplitude associated with the calibration point as the reference amplitude, and calibrate it as Jz, then confirm the specific amplitude associated with the turning point of the internal signal waveform of the reflected signal, and calibrate it as Fz, the trend of the waveform segments before and after the turning point of the waveform is opposite, and use: Fz-Jz=Tz to confirm the waveform feature Tz associated with the reflected signal; If Tz < 0, it means that the reflected signal and the pulse signal are in the opposite state, then a low-resistance signal is directly generated, and then the time t from the start of the pulse signal transmission to the reception of the reflected signal is confirmed. The distance parameter L1 of the abnormal node is confirmed using: L1 = v × t / 2, where v is a preset value, representing the transmission speed of the signal in the harness, and the generated low-resistance signal and distance parameter L1 are displayed; If Tz>0, it means that there is a reflection signal, but it is not opposite to the pulse signal. Then, an impedance mismatch point signal is directly generated, and the time t from the start of pulse signal transmission to the reception of the reflection signal is synchronized. The distance parameter L2 of the abnormal node is confirmed by using: L2=v×t / 2, and the generated impedance mismatch point signal and distance parameter L2 are displayed; Step 2: Based on the normal wire bundle determined in the multi-wire bundle, confirm the receiving signal associated with the normal wire bundle during the synchronization test from the signal receiving end, confirm the attenuation rate of the corresponding pulse signal in the corresponding normal wire bundle based on the waveform characteristics associated with the received signal, and evaluate whether the normal wire bundle is a qualified wire bundle based on the attenuation rate. The specific method is as follows: S21, confirm the signal characteristics of the preset pulse signal, lock the amplitude and width associated with the pulse signal, calibrate the confirmed amplitude as Fz, calibrate the horizontal width between the start point and the end point of the pulse signal waveform as Kd, and use: XT=Fz×C1+Kd×C2 to confirm the signal characteristic XT associated with the pulse signal, where C1 and C2 are both preset fixed coefficient factors; S22, using the same processing method as step S21, confirm the signal characteristics of the received signal associated with the normal line bundle, and mark the different signal characteristics confirmed by different normal line bundles as T k , where k represents different normal harnesses, using: XJ k =[(XT-T k )÷XT]×100%Confirm the attenuation rate XJ associated with the corresponding normal harness k , evaluate the attenuation rate XJ associated with the corresponding normal harness k Satisfied: XJ k ≥20%, otherwise, the normal wiring harness is regarded as a qualified wiring harness; if it is satisfied, the normal wiring harness is regarded as a non-qualified wiring harness; Step 3: For the calibrated substandard wiring harness, retest the substandard wiring harness, test the substandard wiring harness through the set voltage value range, and evaluate whether the substandard wiring harness is an abnormal wiring harness based on the current value performance associated with the substandard wiring harness. The specific sub-steps are: S31, testing the substandard wiring harness based on a preset voltage value interval: gradually increasing the operating voltage of the substandard wiring harness from the minimum value of the voltage value interval to the maximum value to confirm the voltage climbing curve, and recording the current value curve generated in the climbing stage, wherein the voltage value interval is the preset interval; S32, based on the preset resistance parameter C and the confirmed voltage climbing curve, a standard current change curve associated with the voltage climbing curve is generated, wherein the current value = the voltage value ÷ the resistance parameter C, and based on the different voltages associated with different moments in the voltage climbing curve, different currents associated with different moments can be confirmed, and then the corresponding standard current change curve is generated; S33, placing the standard current change curve and the current value curve in the same two-dimensional coordinate system, and moving the standard current change curve by ±X1 to confirm a set of moving areas, where X1 is a preset current fluctuation value, confirming a portion of the current value curve located in the moving area, and calibrating the confirmed portion of the curve as the standard curve; The total line length ratio ZB of the standard curve located in the current value curve is recorded, where ZB=standard curve line length÷current value curve line length. If ZB<80%, the substandard wiring harness is calibrated as an abnormal wiring harness, and an abnormal signal is generated synchronously for display. If ZB≥80%, no calibration is performed, which means that the substandard wiring harness will not affect normal use in the future.

[0007] Preferably, the multi-harness test system comprises: At the initial evaluation end of the wiring harness, a preset pulse signal is used to synchronously test multiple wiring harnesses to identify whether there is a reflected signal at the signal transmitting end. Based on the identification result, the faulty wiring harness and the normal wiring harness are locked. Then, based on the waveform difference between the pulse signal and the reflected signal in the abnormal wiring harness, the abnormal cause of the faulty wiring harness is locked and displayed; The qualified wiring harness evaluation end, based on the normal wiring harness determined in the multi-wiring harness, confirms the receiving signal associated with the normal wiring harness during the synchronization test from the signal receiving end, confirms the attenuation rate generated by the corresponding pulse signal in the corresponding normal wiring harness based on the waveform characteristics associated with the receiving signal, and evaluates whether the normal wiring harness belongs to the qualified wiring harness based on the attenuation rate; At the abnormal wiring harness assessment end, for the calibrated substandard wiring harness, such substandard wiring harness is retested, the substandard wiring harness is tested through a set voltage value range, and based on the current value performance associated with the substandard wiring harness, it is assessed whether the substandard wiring harness is an abnormal wiring harness.

[0008] The present invention provides a multi-wire harness testing method and system. Compared with the prior art, it has the following beneficial effects: When the present invention performs synchronous testing on multiple wiring harnesses, the reflection signal is confirmed based on the reflection condition of the corresponding wiring harness, and the polarity of the reflection signal is analyzed to confirm whether the polarity between the reflection signal and the pulse signal is the same. If the confirmation result is the same, it means that there is an impedance abnormal point in the corresponding wiring harness. If the confirmation result is opposite, it means that there is a low resistance in the corresponding wiring harness. The step-by-step test confirmation method can effectively confirm whether the corresponding wiring harness is a normal wiring harness, improve the comprehensiveness of the test process, and quickly lock the faulty wiring harness. For the confirmed normal wiring harness, the compliance test is carried out again. Based on the signal characteristics of the corresponding wiring harness transmission signal, the attenuation rate associated with the corresponding wiring harness is confirmed. Based on the numerical parameters of the attenuation rate, it is locked whether the corresponding normal wiring harness is a standard wiring harness or a substandard wiring harness. For the substandard wiring harness, the voltage range is used and the internal voltage value of the wiring harness is gradually increased to confirm the current numerical performance associated with the corresponding wiring harness. Based on the specific numerical performance results, it is confirmed whether the corresponding substandard wiring harness will affect the normal use in the later period, improve the overall assessment effect between the wiring harnesses, ensure the comprehensiveness of the comprehensive test, and enable multiple wiring harnesses to obtain effective test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the process of the present invention; Figure 2 It is a schematic diagram of the principle framework of the present invention. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0011] First embodiment See also Figure 1 , the present application provides a multi-harness testing method, comprising the following steps: Step 1: Use a preset pulse signal to synchronously test multiple harnesses to identify whether there is a reflected signal at the signal transmitting end. Based on the identification result, lock the faulty harness and the normal harness. Then, based on the waveform difference between the pulse signal and the reflected signal in the abnormal harness, lock the abnormal cause of the faulty harness and display it. Specifically, when performing pulse testing on the harness, give priority to determining a group of pulse signals that are most suitable for testing. The amplitude, width and frequency of the pulse signal are all set values, which are prepared in advance by relevant personnel. Each different harness is tested with a corresponding pulse signal. If there is an abnormal node in the corresponding harness, a reflected signal will be generated at the abnormal node. Based on the specific form of the corresponding reflected signal, the corresponding abnormal cause can be locked, which is convenient for subsequent relevant personnel to perform maintenance and repair. Among them, the specific method of locking the faulty wiring harness and the abnormal cause is as follows: S11, transmitting a preset pulse signal from the signal transmitting end to each wiring harness in the multi-wiring harness, identifying whether the corresponding wiring harness generates a reflection signal, if there is a reflection signal, marking the corresponding wiring harness as a faulty wiring harness, if there is no reflection signal, marking the corresponding wiring harness as a normal wiring harness (that is, the corresponding pulse signal is normally transmitted from the transmitting end to the receiving end without any reflection), and the signal transmitting end can directly receive the reflection signal, and based on the reception result, assess whether there is a reflection signal in the corresponding wiring harness; S12, confirm the signal waveforms of the pulse signal and the reflected signal, take the starting point of the signal waveform of the pulse signal as the calibration point, take the amplitude associated with the calibration point as the reference amplitude, and calibrate it as Jz, then confirm the specific amplitude associated with the turning point of the internal signal waveform of the reflected signal, and calibrate it as Fz, the trend of the waveform segments before and after the waveform turning point is opposite, that is, when the waveform at one end climbs upward, after passing the waveform turning point, the subsequent waveform falls downward, similarly, when the waveform at one end falls downward, after passing the waveform turning point, the subsequent waveform climbs upward, adopt: Fz-Jz=Tz to confirm the waveform feature Tz associated with the reflected signal; If Tz < 0, it means that the reflected signal and the pulse signal are in the opposite state, that is, the amplitude line associated with the calibration point is used as the baseline, the pulse signal is above the baseline, and the reflected signal is below the baseline, then it is in the opposite state, and a low-resistance signal is directly generated. The low resistance is most likely caused by a short circuit inside the harness. When there is low resistance inside the harness, a set of waveforms with opposite polarity will be reflected back due to the presence of the pulse signal, that is, the reflected signal presents a state opposite to the pulse signal. Then confirm the time t from the start of the pulse signal transmission to the receipt of the reflected signal, and use: L1 = v × t / 2 to confirm the distance parameter L1 of the abnormal node, where v is a preset value, representing the transmission speed of the signal in the harness, which is prepared in advance by relevant personnel, and the generated low-resistance signal and distance parameter L1 are displayed; If Tz>0, it means that the reflected signal exists, but it does not present the opposite state to the pulse signal. Then, the impedance mismatch point existence signal is directly generated, and the time t from the start of the pulse signal transmission to the reception of the reflected signal is synchronized. The distance parameter L2 of the abnormal node is confirmed by using: L2=v×t / 2, and the generated impedance mismatch point existence signal and distance parameter L2 are displayed; Its Tz cannot be equal to 0. If it is equal to 0, it means there is no reflection signal. Then this type of wiring harness is a normal wiring harness, so Tz here cannot be equal to 0. Specifically, during normal testing, the signal transmitted in the wiring harness will be transmitted from the transmitting end to the receiving end. However, when there is an abnormal node inside the wiring harness, a reflected signal will be generated. The waveform polarity of the reflected signal generated by different types of abnormal nodes is different, either the same as the polarity of the pulse signal or the opposite to the polarity of the pulse signal. Therefore, based on the specific performance state of the signal waveform corresponding to the reflected signal and the associated time parameters, the location of the abnormal node associated with the corresponding reflected signal can be locked, and the abnormal cause associated with the abnormal node can be locked synchronously. By determining the amplitude standard and the method of determining the amplitude, the corresponding abnormal cause can be quickly locked; Step 2: Based on the normal wiring harness determined in the multi-wiring harness, confirm the receiving signal associated with the normal wiring harness during the synchronization test from the signal receiving end, confirm the attenuation rate of the corresponding pulse signal in the corresponding normal wiring harness based on the waveform characteristics associated with the receiving signal, and evaluate whether the normal wiring harness belongs to the qualified wiring harness based on the attenuation rate. Specifically, the better the overall performance of the corresponding wiring harness, the weaker the attenuation ability of its signal strength, and the attenuation rate of the corresponding pulse signal generated during the transmission process can be confirmed based on the specific strength data of the wiring harness to perform relevant evaluations of the qualified wiring harness and the non-qualified wiring harness. The specific sub-steps for evaluating whether the normal wiring harness belongs to the qualified wiring harness are as follows: S21. Confirm the signal characteristics of the preset pulse signal, lock the amplitude and width associated with the pulse signal, calibrate the confirmed amplitude as Fz, calibrate the horizontal width between the start point and the end point of the pulse signal waveform as Kd, and use: XT=Fz×C1+Kd×C2 to confirm the signal characteristic XT associated with the pulse signal, where C1 and C2 are both preset fixed coefficient factors, and their specific values ​​are determined by the operator based on experience; S22, using the same processing method as step S21, confirm the signal characteristics of the received signal associated with the normal line bundle, and mark the different signal characteristics confirmed by different normal line bundles as T k , where k represents different normal harnesses, using: XJ k =[(XT-T k )÷XT]×100%Confirm the attenuation rate XJ associated with the corresponding normal harness k , evaluate the attenuation rate XJ associated with the corresponding normal harness k Satisfied: XJ k ≥20%, if it is satisfied, the normal wiring harness is marked as a substandard wiring harness, otherwise, the normal wiring harness is marked as a standard wiring harness; Specifically, when the corresponding wiring harness is confirmed to meet the standard or not, the performance of the corresponding wiring harness in actual use needs to be evaluated based on the specific waveform attenuation during the corresponding signal transmission process. However, in the actual processing process, the signal attenuation rate generated by the normal wiring harness is generally not too high. If the signal attenuation rate is too large, it will lead to the normal use behavior of such wiring harness in the later stage, resulting in the deterioration of the use effect of such wiring harness, and the use effect of the wiring harness cannot be fully guaranteed; For the substandard wiring harnesses that have been identified, it is necessary to re-analyze the normal use status of such substandard wiring harnesses in the later use process. Based on the specific performance of the voltage and current values, the use status performance of such substandard wiring harnesses in the actual use process is evaluated to conduct a comprehensive evaluation and complete the comprehensive evaluation and analysis effect of multiple groups of wiring harnesses. Step 3: For the calibrated substandard wiring harness, retest the substandard wiring harness, test the substandard wiring harness through the set voltage value range, and evaluate whether the substandard wiring harness is an abnormal wiring harness based on the current value performance associated with the substandard wiring harness. The specific sub-steps of the evaluation are: S31, testing the substandard wiring harness based on a preset voltage value interval: gradually increasing the operating voltage of the substandard wiring harness from the minimum value of the voltage value interval to the maximum value to confirm the voltage climbing curve, and recording the current value curve generated during the climbing stage, wherein the voltage value interval is a preset interval, which is prepared in advance by the operator based on experience; S32, based on the preset resistance parameter C and the confirmed voltage climbing curve, a standard current change curve associated with the voltage climbing curve is generated, wherein the current value = the voltage value ÷ the resistance parameter C, and based on the different voltages associated with different moments in the voltage climbing curve, different currents associated with different moments can be confirmed, and then the corresponding standard current change curve is generated; S33, placing the standard current change curve and the current value curve in the same two-dimensional coordinate system, and moving the standard current change curve by ±X1 to confirm a set of moving areas, where X1 is a preset current fluctuation value, which is prepared in advance by relevant operators based on experience, confirming a portion of the current value curve located in the moving area, and calibrating the confirmed portion of the curve as the standard curve; Record the total line length ratio ZB of the standard curve located in the current value curve, where ZB=standard curve line length÷current value curve line length. If ZB≥80%, no calibration is performed, which means that this substandard wiring harness will not affect the normal use in the future. If ZB<80%, this substandard wiring harness is calibrated as an abnormal wiring harness, and an abnormal signal is generated synchronously for display for external personnel to view; Specifically, during the normal testing of the wiring harness, the relevant current value curve is confirmed based on the corresponding voltage parameter change process, and then the standard current curve is determined based on the set specific standards. The confirmed current value curve is compared with the standard current curve, and the corresponding current fluctuation area is confirmed by the standard current curve. Then, the specific curve characteristics associated with the corresponding current value curve and the fluctuation area are evaluated, and the corresponding wiring harness usage status is evaluated. It is locked whether the corresponding wiring harness will affect normal use, so as to achieve better multi-wiring harness assessment and analysis management effects.

[0012] Second embodiment Multi-harness test system, including: At the initial evaluation end of the wiring harness, a preset pulse signal is used to synchronously test multiple wiring harnesses to identify whether there is a reflected signal at the signal transmitting end. Based on the identification result, the faulty wiring harness and the normal wiring harness are locked. Then, based on the waveform difference between the pulse signal and the reflected signal in the abnormal wiring harness, the abnormal cause of the faulty wiring harness is locked and displayed; The qualified wiring harness evaluation end, based on the normal wiring harness determined in the multi-wiring harness, confirms the receiving signal associated with the normal wiring harness during the synchronization test from the signal receiving end, confirms the attenuation rate generated by the corresponding pulse signal in the corresponding normal wiring harness based on the waveform characteristics associated with the receiving signal, and evaluates whether the normal wiring harness belongs to the qualified wiring harness based on the attenuation rate; At the abnormal wiring harness assessment end, for the calibrated substandard wiring harness, such substandard wiring harness is retested, the substandard wiring harness is tested through a set voltage value range, and based on the current value performance associated with the substandard wiring harness, it is assessed whether the substandard wiring harness is an abnormal wiring harness.

[0013] Some of the data in the above formulas are dimensionless and numerically calculated. Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0014] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A multi-harness test method, characterized in that: The following steps are involved: Step 1: Use a preset pulse signal to synchronously test multiple wiring harnesses to identify whether there is a reflected signal at the signal transmitting end. Based on the identification result, the faulty wiring harness and the normal wiring harness are locked. Then, based on the waveform difference between the pulse signal and the reflected signal in the abnormal wiring harness, the abnormal cause of the faulty wiring harness is locked and displayed; Step 2: Based on the normal wire bundle determined in the multi-wire bundle, confirm the receiving signal associated with the normal wire bundle during the synchronization test from the signal receiving end, confirm the attenuation rate of the corresponding pulse signal in the corresponding normal wire bundle based on the waveform characteristics associated with the receiving signal, and evaluate whether the normal wire bundle belongs to the qualified wire bundle based on the attenuation rate; Step 3: Retest the substandard wiring harnesses that are calibrated to be non-compliant, test the non-compliant wiring harnesses through a set voltage value range, and assess whether the non-compliant wiring harness is an abnormal wiring harness based on the current value performance associated with the non-compliant wiring harness.

2. The multi-harness testing method according to claim 1, characterized in that: In step 1, the specific method of locking the faulty wiring harness is: S11, transmitting a preset pulse signal from the signal transmitting end to each wiring harness in the multi-wiring harness, identifying whether the corresponding wiring harness generates a reflection signal, if a reflection signal exists, marking the corresponding wiring harness as a faulty wiring harness, if no reflection signal exists, marking the corresponding wiring harness as a normal wiring harness; S12, confirm the signal waveforms of the pulse signal and the reflected signal, take the starting point of the signal waveform of the pulse signal as the calibration point, take the amplitude associated with the calibration point as the reference amplitude, and calibrate it as Jz, then confirm the specific amplitude associated with the turning point of the internal signal waveform of the reflected signal, and calibrate it as Fz, the trend of the waveform segments before and after the turning point of the waveform is opposite, and use: Fz-Jz=Tz to confirm the waveform feature Tz associated with the reflected signal; If Tz is less than 0, it means that the reflected signal and the pulse signal are in the opposite state, then a low-resistance signal is directly generated, and then the time t from the start of pulse signal transmission to the receipt of the reflected signal is confirmed. The distance parameter L1 of the abnormal node is confirmed using: L1=v×t / 2, where v is a preset value, representing the transmission speed of the signal in the wiring harness, and the generated low-resistance signal and distance parameter L1 are displayed.

3. The multi-wire harness testing method according to claim 2, characterized in that: In step S12, if Tz>0, it means that there is a reflected signal, but it does not present an opposite state to the pulse signal, then an impedance mismatch point existence signal is directly generated, and synchronously based on the time t from the start of pulse signal transmission to the reception of the reflected signal, the distance parameter L2 of the abnormal node is confirmed using: L2=v×t / 2, and the generated impedance mismatch point existence signal and distance parameter L2 are displayed.

4. The multi-wire harness testing method according to claim 1, characterized in that: In the step 2, the specific method of evaluating whether the normal wiring harness is a qualified wiring harness based on the attenuation rate is as follows: S21, confirm the signal characteristics of the preset pulse signal, lock the amplitude and width associated with the pulse signal, calibrate the confirmed amplitude as Fz, calibrate the horizontal width between the start point and the end point of the pulse signal waveform as Kd, and use: XT=Fz×C1+Kd×C2 to confirm the signal characteristic XT associated with the pulse signal, where C1 and C2 are both preset fixed coefficient factors; S22, using the same processing method as step S21, confirm the signal characteristics of the received signal associated with the normal line bundle, and mark the different signal characteristics confirmed by different normal line bundles as T k , where k represents different normal harnesses, using: XJ k =[(XT-T k )÷XT]×100%Confirm the attenuation rate XJ associated with the corresponding normal harness k , evaluate the attenuation rate XJ associated with the corresponding normal harness k Satisfied: XJ k ≥20%, otherwise, the normal wiring harness is regarded as the qualified wiring harness.

5. The multi-wire harness testing method according to claim 4, characterized in that: In step S22, if XJ k Meet XJ k ≥20%, the normal wiring harness will be marked as a substandard wiring harness.

6. The multi-harness testing method according to claim 5, characterized in that: In step 3, the specific sub-steps for evaluating whether the substandard wiring harness is an abnormal wiring harness are as follows: S31, testing the substandard wiring harness based on a preset voltage value interval: gradually increasing the operating voltage of the substandard wiring harness from the minimum value of the voltage value interval to the maximum value to confirm the voltage climbing curve, and recording the current value curve generated in the climbing stage, wherein the voltage value interval is the preset interval; S32, based on the preset resistance parameter C and the confirmed voltage climbing curve, a standard current change curve associated with the voltage climbing curve is generated, wherein the current value = the voltage value ÷ the resistance parameter C, and based on the different voltages associated with different moments in the voltage climbing curve, different currents associated with different moments can be confirmed, and then the corresponding standard current change curve is generated; S33, placing the standard current change curve and the current value curve in the same two-dimensional coordinate system, and moving the standard current change curve by ±X1 to confirm a set of moving areas, where X1 is a preset current fluctuation value, confirming a portion of the current value curve located in the moving area, and calibrating the confirmed portion of the curve as the standard curve; Record the total line length ratio ZB of the standard curve located in the current value curve, where ZB=standard curve line length÷current value curve line length. If ZB<80%, the substandard wire harness is calibrated as an abnormal wire harness, and an abnormal signal is generated synchronously for display.

7. The multi-harness testing method according to claim 6, characterized in that: In step S33, if ZB≥80%, no calibration is performed, which means that the substandard wiring harness will not affect normal use in the future.

8. A multi-beam test system, the test system being operated according to the multi-beam test method according to any one of claims 1 to 7, characterized in that: include: At the initial evaluation end of the wiring harness, a preset pulse signal is used to synchronously test multiple wiring harnesses to identify whether there is a reflected signal at the signal transmitting end. Based on the identification result, the faulty wiring harness and the normal wiring harness are locked. Then, based on the waveform difference between the pulse signal and the reflected signal in the abnormal wiring harness, the abnormal cause of the faulty wiring harness is locked and displayed; The qualified wiring harness evaluation end, based on the normal wiring harness determined in the multi-wiring harness, confirms the receiving signal associated with the normal wiring harness during the synchronization test from the signal receiving end, confirms the attenuation rate generated by the corresponding pulse signal in the corresponding normal wiring harness based on the waveform characteristics associated with the receiving signal, and evaluates whether the normal wiring harness belongs to the qualified wiring harness based on the attenuation rate; At the abnormal wiring harness assessment end, for the calibrated substandard wiring harness, such substandard wiring harness is retested, the substandard wiring harness is tested through a set voltage value range, and based on the current value performance associated with the substandard wiring harness, it is assessed whether the substandard wiring harness is an abnormal wiring harness.

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