Wire harness intelligent detection device

Abstract

The application discloses a kind of harness intelligent detection devices, at least comprising first interface, second interface and multiple detection units, wherein, first interface and second interface are provided with multiple independent pins, for being connected with the connector of both ends of the harness to be measured, to be connected with both ends of each core wire of the harness to be measured in turn according to the pin order set;Each detection unit is connected with corresponding pin and forms a serial path by the harness to be measured, in the serial path, the input end of the detection unit at the head of string is connected with power supply, the output end of the detection unit is connected with corresponding pin, the input end and the output end of the remaining detection unit are all connected with corresponding pin, the output end of the detection unit at the tail of string is grounded through corresponding core wire, to form serial detection loop in this way.Adopting the technical scheme of the application, whether the harness is normal can be automatically detected, and broken wire, short circuit, line sequence dislocation and the like conditions can be detected, so as to improve the maintenance ability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wire harness detection, and in particular to a wire harness intelligent detection device. BACKGROUND

[0002] In recent years, new energy technology has developed rapidly, and power batteries (storage batteries, super capacitors, etc. storage devices) are increasingly widely used. The single cell voltage and capacity of the power battery are relatively low, and in actual application, multiple batteries are often connected in series to increase the voltage, and multiple batteries are connected in parallel to increase the capacity. Therefore, a large number of wire harnesses are needed for connection in the application system of the power battery, especially in electric vehicles, energy storage power stations and the like, which have high requirements for the quality of the wire harnesses. The quality of the wire harnesses needs to be detected to ensure that the wire harnesses are free from unqualified phenomena such as short circuit, open circuit, line sequence error, and damage to the insulation protective layer, and to prevent major safety accidents from occurring during operation. The structures on the wire harnesses of different projects differ, and production and detection personnel cannot use special test fixtures for batch detection. Once the connection is wrong, it may cause serious consequences.

[0003] The wire harness is in a flow line mode during the manufacturing process, and all processes need to be manually involved. Inevitably, terminal insertion errors, short circuits, open circuits and the like may occur in the middle, such as inconsistent identification of the sleeve wire at both ends, which may cause terminal insertion errors in subsequent processes; unreliable parallel welding / pressing or terminal pressing may cause open circuits; unreliable insulation treatment of parallel welding / pressing points may cause short circuits; although the wire harness factory may conduct continuity detection on the wire harness, there may be inevitable omissions, low efficiency, and it is difficult to detect short circuits between different wires.

[0004] Some wire harness factories generally do not timely manufacture corresponding wire harness continuity test fixtures when producing a certain type of wire harness for the first time, and adopt manual continuity test. For short circuit test, any wire harness of a wire mark needs to be continuity tested with all wire harnesses of other wire marks, and only when all do not continuity, it is normal. This step has a large workload and a high probability of omissions in part of the test.

[0005] At present, when the wire harness enters the warehouse, the detection personnel usually adopts the manual continuity test method of the multimeter to detect the continuity, short circuit and line sequence of the wire harness. The ordinary multimeter can only detect the continuity of one cable at a time, and needs to find the corresponding connector pin definition of the same wire mark according to the drawing to detect, which has low detection efficiency. Since the pin hole diameter of the connector is small, the multimeter probe is not easy to be inserted into the pin of the connector, and the detection is prone to errors and slow. Obviously, this detection method excessively depends on the working ability, proficiency and patience of the detection personnel.

[0006] From the above analysis, the existing wire harness detection scheme at least has the following defects:

[0007] (1) The existing manual inspection scheme requires several production inspection personnel to cooperate in point-by-point inspection, which is inefficient, has a large workload, is tedious, easy to get tired, makes mistakes, and takes too long to inspect.

[0008] (2) Manual testing requires reference to CAD drawings, which can easily lead to missed or incorrect detections, especially for wire harnesses with a large number of core wires.

[0009] (3) Manual testing can generally only detect continuity and is difficult to detect short circuits in multi-core wire harnesses; at the same time, manual testing is generally only a random inspection and cannot guarantee the quality of batch wire harnesses.

[0010] Therefore, given the shortcomings of existing technologies, it is necessary to propose a technical solution to address the technical problems existing in the current technology. Summary of the Invention

[0011] In view of this, it is indeed necessary to provide a wire harness intelligent detection device that can automatically detect whether the wire harness is normal, and at the same time detect conditions such as broken wires, short circuits, and misaligned wire sequences, thereby improving maintenance capabilities.

[0012] In order to solve the technical problems existing in the prior art, the technical solution of the present invention is as follows:

[0013] A wire harness intelligent testing device includes at least a first interface, a second interface, and multiple testing units. Each of the first and second interfaces has multiple independent pins for connecting to connectors at both ends of the wire harness under test, sequentially connecting to the ends of each core wire of the wire harness according to a set pin order. Each testing unit is connected to a corresponding pin and forms a serial path through the wire harness under test. In this serial path, the input terminal of the testing unit at the beginning of the series is connected to a power supply, and its output terminal is connected to a corresponding pin. The input and output terminals of the remaining testing units are both connected to corresponding pins. The output terminal of the testing unit at the end of the series is grounded via a corresponding core wire, thus forming a serial testing loop for detecting whether the wire harness under test is normal.

[0014] The detection unit includes at least a bias module, a voltage detection module, a current detection module, and an indicator module. The input terminal of the detection unit is connected to the bias module, the voltage detection module, and the current detection module. The other end of the bias module is grounded to form a closed loop with the upper-level circuit to provide bias current. The voltage detection module is used to detect whether the input voltage is normal. The current detection module is used to detect whether the current current is normal. When the input voltage and the current current are normal, the indicator module is driven to output an indicator signal to indicate that the corresponding core wire is detected normally; otherwise, it indicates that the tested wire harness is abnormal.

[0015] As a further improvement, in the serial detection circuit, the end pin is grounded through a resistor.

[0016] As a further improvement, multiple switches are also provided, with each switch having its two ends connected to the corresponding pins of the first and second interfaces, respectively, to short-circuit the unused pins on the connectors at both ends of the tested wire harness.

[0017] As a further improvement, multiple switches are implemented using DIP switches.

[0018] As a further improvement, the detection unit also includes an AND gate module. The input terminal of the AND gate module is connected to the output terminals of the voltage detection module and the current detection module, respectively. The AND gate module uses logic circuits to implement the AND logic function, and is used to output a control signal to cause the indicator module to output an indicator signal when the input voltage is normal and the current current is normal.

[0019] As a further improvement, the indicator module includes an LED indicator and a driving module, wherein the driving module is used to drive the LED indicator according to a control signal.

[0020] As a further improvement, the bias module is implemented using a resistor.

[0021] As a further improvement, the voltage detection module is implemented using a resistor divider.

[0022] As a further improvement, the current detection module is implemented using an optocoupler.

[0023] As a further improvement, the driving module is implemented using a MOSFET or a transistor.

[0024] Compared with the prior art, the technical solution of the present invention has the following technical effects:

[0025] 1. It can not only detect whether the wire harness is normal, but also detect broken wires, short circuits, and misaligned wire sequences. At the same time, it can quickly find the abnormal location of the core wire based on the indication pattern of the LED lights, thereby improving the repair capability.

[0026] 2. The testing process is completed automatically, eliminating the problems of incorrect or missed core wires that occur with manual testing; the only time required is for manually plugging and unplugging the wire harness and checking the LED lights, which is fast and reduces labor costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the intelligent wire harness detection device of the present invention.

[0028] Figure 2 This is a schematic diagram of the detection unit in this invention.

[0029] Figure 3 This is a circuit diagram of a preferred embodiment of the detection unit of the present invention.

[0030] Figure 4 The circuit schematic diagram of another preferred embodiment of the detection unit of the present application.

[0031] Figure 5 The schematic diagram of normal connection of all core wires of the device of the present application.

[0032] Figure 6 The schematic diagram of the case of broken wire of the core wire of the device of the present application.

[0033] Figure 7 The schematic diagram of the case of short circuit of the core wire of the device of the present application.

[0034] Figure 8 The schematic diagram of the case of odd-even misposition line sequence error of the core wire of the device of the present application.

[0035] Figure 9 The schematic diagram of the case of odd-odd misposition line sequence error of the core wire of the device of the present application.

[0036] Figure 10 The schematic diagram of the case of even-even misposition line sequence error of the core wire of the device of the present application.

[0037] The following specific embodiments will further illustrate the present application in combination with the above-mentioned drawings. DETAILED DESCRIPTION

[0038] The technical solutions provided by the present application will be further illustrated in combination with the drawings.

[0039] At present, the detection means of the wire harness is limited, and the artificial detection is not only time-consuming and laborious but also low in efficiency and easy to make mistakes. In order to reduce the problem of wire harness leading to non-working product and possible safety problem, the present application provides a wire harness intelligent detection device, which defines and designs a general wire harness detection device for different types of connectors and wire harnesses. Referring to Figure 1 , the structure schematic diagram of the wire harness intelligent detection device of the present application is shown, which comprises at least a first interface, a second interface and a plurality of detection units, wherein the first interface and the second interface are provided with a plurality of independent pins, which are used for being connected with the connectors at two ends of the measured wire harness, so as to be connected with two ends of each core wire of the measured wire harness in turn according to the set pin sequence; each detection unit is connected with the corresponding pin and forms a serial access through the measured wire harness, in which the input end of the detection unit at the head of the series is connected with the power supply, the output end of the detection unit is connected with the corresponding pin, the input end and the output end of the remaining detection units are connected with the corresponding pin, and the output end of the detection unit at the tail of the series is grounded through the corresponding core wire, so as to form a serial detection loop, which is used for detecting whether the measured wire harness is normal.

[0040] The device of the present application can detect the wire harness with any core number from 1 to n, such as Figure 1The working principle of the present application is illustrated by taking a 4-core wire harness as an example, wherein L1-L4 are different cores in the wire harness under test, J1 and J2 are different connectors on the wire harness under test, J1' and J2' are the sockets of the wire harness detection board, i.e. the first interface and the second interface, and detection units 1-4 are the detection circuits of the wire harness L1-L4 respectively. In a preferred embodiment, in the serial detection loop, the pin at the end of the loop on the first interface or the second interface is grounded through a resistor. That is Figure 1 R in the formula (1) is k R in the formula (2) is k The bias current and bias voltage are provided for the last detection unit 4.

[0041] In another preferred embodiment, the device is further provided with a plurality of switches, the two ends of each switch are connected with the corresponding serial number pins of the first interface and the second interface respectively, and the switches are used to short the empty pin positions on the connectors at both ends of the wire harness under test. In theory, any switch with two positions of opening and closing can be applied. As a preferred, the plurality of switches are realized by using DIP switches. Generally, the DIP switches are not in action by default when they are opened, and when there is no core wire in a pin position on the wire harness (equivalent to an open circuit), the corresponding DIP switch position is closed to simulate the normal connection of the core wire, so that the normality of other core wires can be detected. By shorting the empty pin through the DIP switch, the wire harness without core wire in some positions can be detected, Figure 1 In the DIP switch, switches S1-S4 correspond to L1-L4 respectively, and when there is no core wire in a wire harness interface, the empty pin can be shorted through the DIP switch, so as to form a serial detection loop. Vs is the power supply for the wire harness detection board; Vni and Ini are the input voltage and input current of the nth detection unit, and Vno and Ino are the output voltage and output current of the nth detection unit. If the wire harness under test is normal, V ni = V (n-1)o , I ni = I (n-1) , and the input and output parameter relationships can be used to detect whether the wire harness is normal.

[0042] Further, the connectors of the wire harness under test are not limited to two, and when there are a plurality of connectors, they can be detected step by step, one of the connectors is plugged with J1' of the wire harness detection board, and the remaining connectors are plugged with J2' for testing. If all the light emitting diodes (LEDs) are normal, the wire harness detection passes.

[0043] Referring to Figure 2The diagram shows the principle of the detection unit in this invention, which includes at least a bias module, a voltage detection module, a current detection module, and an indicator module. The input terminal of the detection unit is connected to the bias module, the voltage detection module, and the current detection module. The other end of the bias module is grounded to form a closed loop with the upper-level circuit to provide bias current. The voltage detection module is used to detect whether the input voltage is normal. The current detection module is used to detect whether the current current is normal. When the input voltage and the current current are both normal, the indicator module is driven to output an indicator signal to indicate that the corresponding core wire is detected normally; otherwise, it indicates that the tested wire harness is abnormal.

[0044] In the above technical solution, the detection unit further includes an AND gate module. The input terminals of the AND gate module are connected to the output terminals of the voltage detection module and the current detection module, respectively. It uses logic circuitry to implement the AND logic function, and outputs a control signal to cause the indicator module to output an indicator signal when both the input voltage and current are normal. The indicator module includes an LED indicator and a driver module. The driver module drives the LED indicator according to the control signal. The detection result indicator LEDn can be replaced by other display circuits, such as a digital tube, or automatically determined by processing 0 / 1 signals through an MCU.

[0045] like Figure 2 As shown in the schematic diagram of the detection unit, its bias current Inb provides bias current for the current detection module of the previous detection unit n-1, and Ini = Ino + Inb; the voltage detection module detects whether the input voltage Vni has a normal voltage greater than the threshold, and the detection result is affected by the continuity of the preceding stage core wires. If there is an open circuit in the preceding stage core wires, there is no voltage in Vni, and the voltage detection module outputs 0 (logic NOT); if all preceding stage chips are turned on, there is a voltage in Vni greater than the threshold, and the voltage detection module outputs 1 (logic true).

[0046] The current detection module checks whether the nth core wire is connected. If it is connected and Vni > Vno, then current Ino flows through it, and the current detection module outputs 1 (logic true). If either of these two conditions is not met, no current Ino flows through it, and the current detection module outputs 0 (logic NOT). If there are incorrectly connected or short-circuited core wires in the wiring harness, then between the two problematic core wires, there must be a situation where Vni ≯ Vno, causing the current detection output of the corresponding detection unit to be 0.

[0047] The voltage and current detection results are passed through an AND gate to drive the indicator module. The LED in the indicator module will only light up when both the voltage and current detections are true; if either is false, the LED will turn off. The driving module is implemented using a MOSFET or a transistor.

[0048] See Figure 3, as shown in the circuit principle of a preferred embodiment of the detection unit of the application, the bias module can be implemented by resistance; voltage detection module can be implemented by resistance voltage division; current detection module can be implemented by optocoupler. The specific circuit connection is as shown in Figure 3 , which will not be described here. Among them, the resistance Rn1, Rn2 is both a current bias module and a voltage detection module. The bias current is required to be greater than the input threshold current of the optocoupler of the current detection module in the previous detection unit n-1. When all the core wires of the measured wire harness are normal, the input current I1i of the detection unit 1 is Ino+I1b+...Inb=Ino+n*Ib, which reaches the maximum value, and Ino+n*Ib is required to be less than the rated input current of the optocoupler.

[0049] At the same time, it is required that be greater than the threshold voltage of the drive circuit, that is, the threshold voltage of the MOS tube Qn2, wherein Vf is the forward conduction voltage drop of the light-emitting LED at the input end of the optocoupler.

[0050] The optocoupler OPn and the resistors Rn3, Rn4 are current detection modules. When the Ln core wire is connected and Vni is greater than Vno, the optocoupler outputs logic true, otherwise it outputs logic not.

[0051] The MOS tube Qn1 realizes the function of an AND gate module. Only when the current detection and voltage detection logic are both true (1), the drive signal Vnd is pulled up, otherwise it is low.

[0052] Rn5 and Qn2 realize the function of a drive module, matching the voltage and current of LEDn and power supply Vs.

[0053] Referring to Figure 4 , the circuit principle of another preferred embodiment of the detection unit of the application is shown. Among them, Rn6 is a current bias resistor, which realizes the bias module; Rn7 and Rn8 are resistance voltage division to realize the voltage detection module; the optocoupler OPn realizes the current detection module; the output end of the optocoupler is directly connected into the voltage detection circuit to realize the AND gate function; Qn2 and Rn9 realize the drive function. When the voltage detection and current detection are both true, the LEDn lights up.

[0054] In the above circuit, the MOS tubes Qn1, Qn2 can be replaced by NPN triodes; the optocoupler OPn can also be replaced by high-side current detection elements based on Hall or operational amplifier / comparator.

[0055] By using the above technical scheme, the wire harness breakage, short circuit, wire sequence dislocation and other conditions of the measured wire harness can be detected, and the specific principle is as follows:

[0056] 1) The wire harness is normal

[0057] The following analysis is still taken as an example of 4 cores. When all 4 cores of the measured wire harness are normal,Figure 5 As shown. The input voltages V1i to V4i of all four detection units are true; the four current detection circuits are connected in series and grounded through Rk, so they are all conducting, meaning that the current detection results of all four are true. Therefore, all four LED indicators are lit.

[0058] 2) Broken core wire

[0059] If the tested wire harness has a broken core wire, such as Figure 6 As shown. If L3 is disconnected, detection units 1, 2, and 3 are connected in series to the power supply, and their input voltages Vi1 to Vi3 are all detected as true. The input voltage of detection unit 4 is disconnected by L3, and its detection result is false. The bias currents I2b and I3b at the input terminals of detection units 2 and 3 provide bias to detection units 1 and 2, so the current detection results of detection units 1 and 2 are true. The disconnection of L3 means that the detection currents I3o and I4o have no loop, so the current detection results of detection units 3 and 4 are false. Therefore, the voltage and current detection results of detection units 1 and 2 are both true, and their LEDs are lit. The voltage detection of detection unit 3 is true, but the current detection is false, so its LED is off. The voltage and current detection of detection unit 4 are both false, so its LED is off.

[0060] Therefore, all LEDs before the core wire breaks are lit, and all LEDs at and after the break point are turned off.

[0061] 3) Core wire short circuit

[0062] If L1 and L3 are short-circuited, as follows: Figure 7 As shown. Detection units 1 and 4 are normally connected to the power supply, and LEDs 1 and 4 are lit; the input of detection unit 2 and the output of detection unit 3 are short-circuited, there is no voltage difference between them, no current flows through their current detection circuits, the output is logic NOT, and LEDs 2 and 3 are off.

[0063] Therefore, (LED1, LED) k1 ]&(LED k2 ,LED n All LEDs are lit; k1 LED k2 [Turn off.] Where k1 is the number of the previous shorted core wire, and k2 is the number of the next shorted core wire. That is: all LEDs corresponding to the core wires before (inclusive) the previous shorted core wire, and all LEDs corresponding to the core wires after (exclusive) the next shorted core wire, are lit; all LEDs in between are turned off.

[0064] 4) Misaligned core wires (incorrect wiring sequence)

[0065] A) Parity misalignment

[0066] L2, L3 core wire dislocation as shown in Figure 8 The detection unit 1 voltage detection and current detection are normal before the core wire dislocation, and LED1 is lighted; the current detection output ends of the detection unit 2 and the detection unit 3 are connected together, and the current in two directions is blocked, and the current detection results of them and the detection units after them are all non, and LED2, 3, 4 are extinguished.

[0067] Therefore, the LED lamp before the odd-even dislocation is lighted; all the LED lamps at the dislocation position and after the dislocation position are extinguished.

[0068] B) odd-odd dislocation

[0069] L1, L3 core wire dislocation as shown in Figure 9 The detection unit 1 and 4 are still connected to the power supply in the correct way, and LED1, LED4 are lighted; the detection unit 2 and 3 are skipped and disconnected from the power supply, and LED2 / 3 are extinguished.

[0070] Therefore, (LED1, LED k1 ] & (LED k2 , LED n ) are all lighted; (LED k1 ~ LED k2 ] are extinguished. Wherein k1 is the number of the dislocation core wire before, and k2 is the number of the dislocation core wire after. That is, the LED corresponding to all the core wires before the first dislocation core wire (including) and the LED corresponding to all the core wires after the second dislocation core wire (not including) are lighted; all the LED lamps between them are extinguished.

[0071] C) even-even dislocation

[0072] L2, L4 core wire dislocation as shown in Figure 10 The detection unit 1 and 2 are still connected to the power supply in the correct way, and LED1, LED2 are lighted; the detection unit 3 and 4 are skipped and disconnected from the power supply, and LED3 / 4 are extinguished.

[0073] Therefore, (LED1, LED k1 ] & (LED k2 , LED n ) are all lighted; (LED k1 ~ LED k2 ] are extinguished. The rule is exactly the same as the odd-odd dislocation.

[0074] From the above analysis, the technical scheme of the present application has the following technical effects:

[0075] 1. Not only can the harness be detected, but also the disconnection, short circuit, line sequence dislocation and the like can be detected, and the core wire abnormal position can be quickly found according to the indication rule of the LED lamp, so that the maintenance ability is improved.

[0076] 2, the detection process is automatically completed, and there is no problem of wrong picking and missing detection of the core wire in manual detection; only manual plug-in and checking of the LED light time, fast speed, and reduced labor cost.

[0077] The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be noted that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0078] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A harness intelligent detection device, characterized by, The first interface and the second interface are provided with a plurality of independent pins for connecting with the connectors at both ends of the wire harness to be tested to sequentially connect with both ends of each core wire of the wire harness to be tested according to a set pin sequence; each detection unit is connected with a corresponding pin and forms a serial path through the wire harness to be tested, in which the input end of a detection unit at the head of the serial path is connected with a power supply, the output end of the detection unit is connected with the corresponding pin, the input end and the output end of the remaining detection units are both connected with the corresponding pin, and the output end of a detection unit at the tail of the serial path is grounded through a corresponding core wire to form a serial detection loop for detecting whether the wire harness to be tested is normal; The detection unit at least includes a biasing module, a voltage detection module, a current detection module and an indication module, in which the input end of the detection unit is connected with the biasing module, the voltage detection module and the current detection module, the other end of the biasing module is grounded for forming a closed loop with a superior circuit to provide a biasing current; the voltage detection module is used for detecting whether the input voltage is normal; the current detection module is used for detecting whether the current is normal; when the input voltage is normal and the current is normal, the indication module is driven to output an indication signal to represent that the detection of the corresponding core wire is normal, otherwise, it represents that the wire harness to be tested is abnormal; The detection unit further includes an AND gate module, the input ends of the AND gate module are connected with the output ends of the voltage detection module and the current detection module, a logic circuit is adopted to realize the AND logic function, and the AND gate module is used for outputting a control signal to make the indication module output the indication signal when the input voltage is normal and the current is normal; The biasing module is realized by a resistor; the voltage detection module is realized by resistor voltage division; the current detection module is realized by an optocoupler, in which the nth detection unit includes an optocoupler OPn, a MOS tube Qn1, a MOS tube Qn2, a light emitting diode LEDn, a resistor Rn1, a resistor Rn2, a resistor Rn3, a resistor Rn4, a resistor Rn5, the two input ends of the optocoupler OPn are connected in series in the loop, in which the input positive end of the optocoupler OPn is connected with one end of the resistor Rn1, the other end of the resistor Rn1 is connected with the drain of the MOS tube Qn1, the gate of the MOS tube Qn2 and one end of the resistor Rn2, the output positive end of the optocoupler OPn is connected with one end of the resistor Rn3, one end of the resistor Rn4 and the gate of the MOS tube Qn1, the other end of the resistor Rn3 and one end of the resistor Rn5 are connected with the power supply Vs, the other end of the resistor Rn5 is connected with the positive end of the light emitting diode LEDn, the negative end of the light emitting diode LEDn is connected with the drain of the MOS tube Qn2, the output negative end of the optocoupler OPn, the other end of the resistor Rn4, the other end of the resistor Rn2, the source of the MOS tube Qn1 and the source of the MOS tube Qn2 are grounded; The resistor Rn1 and the resistor Rn2 are both current biasing modules and voltage detecting modules, and the biasing current is greater than the input threshold current of the optocoupler of the current detecting module in the previous detection unit n-1. At the same time greater than the threshold voltage of the driving circuit, that is, the threshold voltage of the MOS tube Qn2, wherein Vf is the forward conduction voltage drop of the light emitting LED at the input end of the optocoupler. The optocoupler OPn and the resistors Rn3 and Rn4 are the current detection module; the MOS tube Qn1 realizes the function of the AND gate module; The resistor Rn5 and the MOS tube Qn2 realize the function of the driving module, and match the voltage and current of the LEDn and the power supply Vs.

2. The wire harness intelligent detection apparatus according to claim 1, characterized by, In the serial detection loop, the end pin is grounded through a resistor.

3. The wire harness intelligent detection apparatus according to claim 1 or 2, characterized by, A plurality of switches are further arranged, two ends of each of the switches are connected with the corresponding serial number pins of the first interface and the second interface respectively, and the switches are used for short-circuiting the empty pin positions on the two end connectors of the measured wire harness.

4. The wire harness smart detection device of claim 3, wherein, The plurality of switches are implemented by DIP switches.

5. The wire harness smart detection device of claim 3, wherein, The indication module comprises an LED indicator and a driving module, and the driving module is used for driving the LED indicator according to a control signal.

6. The wire harness smart detection device of claim 3, wherein, The biasing module is implemented by a resistor.

7. The wire harness smart detection device of claim 3, wherein, The voltage detection module is implemented by a resistor voltage divider.

8. The wire harness smart detection device of claim 3, wherein, The current detection module is implemented by an optocoupler.

9. The wire harness smart detection device of claim 5, wherein, The driving module is implemented by a MOS tube or a triode.

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