Detection method of automotive wiring harness conduction?

The safety function of automobile wiring harness is directly related to the safety of automobiles, so automobile manufacturers pay more and more attention to the quality of wiring harness. At present, in the detection of automobile wiring harness conduction, the definition of error types is single, and multiple error types cannot be distinguished, and the location of errors cannot be accurately identified by supplying, which makes the operator unable to accurately find the problem point and reduces the working power. Most of the existing conduction machines in China are controlled by PLC or single chip microcomputer. When the LED flash screen flashes, it can only flash the serial number of a single I/O port. For incorrect wiring harnesses, it cannot provide more detailed information. This kind of interactivity is poor, which is extremely inconvenient for the inspector to operate. The LED flash screen cannot flash intuitive and visual graphics, which is not humanized. Therefore, it is one of the important issues that technicians in this field need to solve urgently to supply a detection method of car wiring harness conduction with reasonable planning, concise application and remarkable function. The present invention aims to overcome the above shortcomings and provide a method for detecting the conduction of a car wiring harness with reasonable planning, simple process and remarkable function. The technical plan selected by the present invention to finish the above intention is a method for detecting the conduction of an automobile wiring harness, characterized in that the implementation process of the method is as follows: The system selected by the detection method includes a wiring harness detection tooling station, an I/O card, a collection card, a wiring harness detection host, a detection information flash screen, and a bar code printer, and a system selected by the detection method includes a wiring harness detection tooling station, an I/O card, a collection card, a wiring harness detection information flash screen; The wiring harness detection tooling table is provided with a fixture connected with the wiring harness, so that the wires in the wiring harness are connected with the wiring harness detection tooling table, and an interface connected with the conducting machine is provided, and the I/O ports (input/output ports) on the I/O card are connected one by one by special wires, and a closed-loop circuit is formed between the wires in the wiring harness and the I/O ports; The wiring harness detection host sends the detection signal to the I/O port on the I/O card through the collection card, and then collects the signal on the I/O port of the I/O card through the collection card, and transmits the signal back to the host; The host computer will analyze and process the signal, and when a bad condition is detected, it will be prompted through the detection information flash screen connected with the host computer; And the host computer is coupled with the barcode printer; Let the voltages Vl and V2 be separated as the voltages at both ends of the automobile wiring harness loop, and Vl is the standard voltage. The voltage of V2 is logically compared to obtain the logic signal Vo, and the voltage Vo is discriminated. After all, the discriminant function of the wiring harness loop is obtained. The above is the conduction connection of a single circuit, and the car wiring harness is the on-off of a multi-loop multi-terminal circuit. Therefore, all the end points of the car wiring harness are discriminated, the transmitting port and the receiving port are defined, each circuit is identified, the standard DC voltage signal is declared at the transmitting end in turn, the signal is received at the receiving end, and the received data is compared and discriminated with the standard data, after all, the on-off and wiring status of the whole wiring harness is obtained. The inspection function is flashed on the harness detection information flashing window, and voice prompt is performed to identify three error types of open circuit, mismatch and short circuit. The information flashed on the graphical interface includes (1) the error type, (2) the orientation of the error line on the harness, (3) the shape of the pair plug-in of the error line address, (4) the color of the line and (5) the number of the line; And the interface prompts to modify and determine the opinion. The inspection operator finds the error line according to the interface prompt, modifies the wiring harness according to the prompt, sends a signal to the printer after all inspections are qualified, prints the qualified product label, or outputs a signal to control the automatic tooling to eject the car wiring harness. The advantageous effect of the invention is that the method of the invention separately defines and distinguishes a plurality of error types, can supply the orientation of accurately recognizing three errors, enables the operator to accurately find the problem point, and improves the operation power. More detailed information can be supplied for the incorrect harness. This has good interactivity, is extremely convenient for inspectors to operate, and can supply intuitive and visual graphics, making it more humanized. The method of the invention has the advantages of simple implementation process, reasonable planning, accurate and reliable detection data, remarkable function and wide application planning. Detailed Embodiment Method Hereinafter, with reference to the drawings and preferred embodiments, a detailed implementation method, structure and features provided according to the present invention are described below. As shown in FIG. 1 below, the inspection system of the present invention is composed of six parts: a wire harness inspection tooling table, an I/O card, a collection card, a wire harness inspection host, a detection information flash window, and a bar code printer; The wiring harness is fixed on the detection tooling table, the wiring harness detection tooling table is provided with a fixture connected with the wiring harness, the wires in the wiring harness are connected with the wiring harness detection tooling table, and an interface connected with the conducting machine is arranged, and the input and output ports on the I/O card are connected one by one by using special wires, and at this moment, a closed-loop circuit is formed between the wires in the wiring harness and the I/O ports; The wiring harness detection host sends the detection signal to the I/O port on the I/0 card through the collection card, and then collects the signal on the I/O port of the I/O card through the collection card, and transmits the signal back to the host; The host computer will analyze and process the signal, and assume that a bad condition is detected, it will prompt it through the detection information flash window; If no bad condition is detected, the detection information flash window prompts that it is qualified, and the host sends a message to the barcode printer for printing. As shown in Fig. 2, in the wire harness detection, a sending end and a receiving end are defined for each wire. The figure shows a comparison circuit schematic diagram of the receiving end; The transmitting terminal outputs a voltage signal, and V 1 is indicated as the voltage of the receiving terminal; V indicates the standard voltage, V becomes V2 after dividing the voltage by resistor R1 and resistor R2, and is coupled to a voltage comparator; V 1 and V 2 are compared by means of a voltage comparator, and after all, the compared signal V 0 is obtained. The above is the detection connection of a single circuit, and the car wiring harness is the on-off of a multi-loop multi-terminal circuit; It is necessary to discriminate all the end points of the car wiring harness, define the sending and receiving ends, identify each circuit, declare the standard voltage signal at the sending end, receive the signal at the receiving end, and compare and discriminate the received data with the standard data. After all, the On-off and wiring status of the whole wiring harness are obtained; The inspection function is flashed on the information detection flash window, and voice prompt is performed to identify three error types: open circuit, mismatch and short circuit. The information flashed on the graphical interface includes (1) error type, (2) orientation of error line on the wire harness, (3) shape of pair plug-in of error line address, (4) color of line and (5) number of line; And the interface prompts to correct and determine the opinion. The inspection operator finds the error line according to the interface prompt, modifies the wiring harness according to the prompt, sends a signal to the printer after all inspections are qualified, prints the qualified product label, or outputs a signal to control the automatic tooling to eject the car wiring harness. As shown in Figure 3, A and B in the figure indicate both ends of the wiring harness, and there are five wires from No. 1 to No. 5 in the wiring harness; The first is the normally connected wire harness, and the other are the three failure methods of the wire harness (1) disconnect (open) the circuit, and the wires in the wire harness are disconnected; (2) Short circuit, two or more of the wiring harness are short circuited; (3) Mismatch, miswiring of wires in the wiring harness; Through the measurement of the line signal, the data is calculated and analyzed, and whether the wiring harness is qualified or not is obtained. The unqualified wiring harness hints the failure method of the wiring harness. The failure detected by the wire harness detection system can be concluded by the above method; The flashing method of the detection system is to input the graphic information of the wiring harness, and prompt the error type and error orientation together with the detection. The error orientation is prompted by the wiring harness graphic, and the modified opinion is given. At the same time, only one circuit error record flashes, and the employee operating at the moment can repair it according to the content of the graphic prompt. If the bad condition at that time is modified, the next error record will continue to flash in the future. Due to its specific safety and low-loss functional requirements, it is particularly important to plan the voltage standard and device selection of this circuit. The standard voltage set in this circuit is 5-6V, and the standard resistance value for judging wire failure is 50Ω, which completely meets the safety requirements and quality requirements of the wire harness in the process of automotive wire harness testing. The above-described detailed description of the method for detecting the conduction of the automobile wiring harness with reference to the embodiment is illustrative and not limiting; Therefore, changes and modifications without departing from the overall concept of the present invention should fall within the maintenance plan of the present invention.

-------------------------------------------------------------------------------------------------

A method for detecting automobile wiring harness conduction is characterized in that the implementation process of the method is as follows: The system selected by the detection method includes a wiring harness detection tooling table, an I/O card, a collection card, a wiring harness detection host, a detection information flash screen, and a bar code printer; The wiring harness detection tooling table is provided with a fixture connected with the wiring harness, so that the wires in the wiring harness are connected with the wiring harness detection tooling table, and an interface connected with the conducting machine is provided, and the I/O ports on the I/O card are connected one by one by using special wires, and a closed-loop circuit is formed between the wires in the wiring harness and the I/O ports; The wiring harness detection host sends the detection signal to the I/O port on the I/O card through the collection card, and then collects the signal on the I/O port of the I/O card through the collection card, and transmits the signal back to the host; The host computer will analyze and process the signal, and when a bad condition is detected, it will be prompted through the detection information flash screen connected with the host computer; And the host computer is coupled with the barcode printer; Let the voltages V1 and V2 be separated as the voltages at both ends of the car wiring harness loop, and V1 is the standard voltage. The voltage of V2 is logically compared to obtain the logic signal Vo, and the voltage Vo is discriminated. After all, the discriminant function of the wiring harness loop is obtained. The above is the conduction connection of a single circuit, and the car wiring harness is the on-off of a multi-loop multi-terminal circuit. Therefore, all the end points of the car wiring harness are discriminated, the transmitting port and the receiving port are defined, each circuit is identified, the standard DC voltage signal is declared at the transmitting end in turn, the signal is received at the receiving end, and the received data is compared and discriminated with the standard data, after all, the on-off and wiring status of the whole wiring harness is obtained. The inspection function is flashed on the harness detection information flashing window, and voice prompt is performed to identify three error types of open circuit, mismatch and short circuit. The information flashed on the graphical interface includes (1) the error type, (2) the orientation of the error line on the harness, (3) the shape of the pair plug-in of the error line address, (4) the color of the line and (5) the number of the line; And the interface prompts to modify and determine the opinion. The inspection operator finds the error line according to the interface prompt, modifies the wiring harness according to the prompt, sends a signal to the printer after all inspections are qualified, prints the qualified product label, or outputs a signal to control the automatic tooling to eject the car wiring harness. The invention relates to a method for detecting the conduction of automobile wiring harness, which comprises the following steps: setting voltages V1 and V2 as two ends of the automobile wiring harness circuit, applying a standard voltage to V1, carrying out logical comparison on the voltage of V2 to obtain the voltage Vo, and carrying out discrimination comparison on the voltage Vo, after all, obtaining the discrimination function of whether the wiring harness is qualified or not; The above is the detection connection of a single circuit, and the detection of automobile wiring harness is the detection discrimination of multi-loop and multi-endpoint circuits; To judge all the end points of the automobile wiring harness, it is necessary to define the sending and receiving ends, identify each circuit, announce the standard voltage signal at the sending end, receive the signal at the receiving end, and compare and judge the received data with the standard data. After all, the on-off and wiring status of the whole wiring harness are obtained, the inspection function graph is flashed on the liquid crystal flasher, and voice prompt is supplied. After all the inspection is qualified, the product qualification label is printed, or the output signal is output to control the automatic tooling to pop up the automobile wiring harness. Its planning is reasonable and its effect is remarkable.

---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- If you have related [connector wiring harness and cable production] purchasing/purchasing needs or want to purchase/understand which connector wiring harness and cable product solutions we can provide, please contact our business staff below; If you have related sales/resources and promotion needs of [Connector Wiring Harness and Cable Production], please click "→ Business Cooperation ←" to negotiate with a dedicated person!