Automatic inner hole depth inspection and linkage marking system and method for high-pressure oil rail

Abstract

The invention relates to the field of high-pressure oil rail inspection, in particular to an automatic inner hole depth inspection and linkage marking system and method for a high-pressure oil rail, and the system comprises a fixing unit, a measuring unit, a marking unit and a control unit. The fixing unit locks the high-pressure oil rail. The measuring unit and the marking unit are installed near the fixing unit, and oil sprayer base inner hole depth inspection and high-pressure oil rail marking are completed. The control unit is connected to the fixing unit, the measuring unit and the marking unit. And for the detected high-pressure oil rail, the control unit uses the marking unit to mark the high-pressure oil rail. On the contrary, only detection disqualification is prompted. The invention also comprises a method. According to the invention, automatic depth inspection of the fuel injector seat and automatic marking linkage and inspection are realized, and only qualified products are marked, so that the labor cost is greatly saved, missing inspection and result judgment errors caused by manual judgment of inspection results are reduced, the inspection quality is improved, and unqualified products are prevented from entering the next process. And unqualified products can be effectively prompted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of high-pressure oil rail inspection, and in particular to a high-pressure oil rail automatic inner hole depth inspection and linkage marking system and method. BACKGROUND

[0002] The Chinese automobile industry is experiencing rapid development, and the automobile industry is increasingly subject to safety accident recall events, and consumers are increasingly demanding product production quality and safety. The injector seat in the super-high-pressure oil rail, as a safety component of the automobile engine, is subject to even greater quality requirements.

[0003] The inner hole depth dimension inspection of the injector seat part in the high-pressure oil rail is of the utmost importance. Current inspection instruments have low inspection efficiency, high manual missed inspection probability, and increased labor costs.

[0004] For example, existing instruments require manual insertion of a measurement instrument detection head into a product, and the insertion depth cannot be accurately controlled, which cannot meet the standard detection requirements, causing data distortion and internal product scratches, and cannot guarantee that the inspection action has been completed. SUMMARY

[0005] The present application aims to provide a high-pressure oil rail automatic inner hole depth inspection and linkage marking system and method, which mainly solves the problems of the prior art and avoids missed inspection risks. It can perform automatic inspection, improve production efficiency and product quality, and reduce production labor costs.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present application is to provide a high-pressure oil rail automatic inner hole depth inspection and linkage marking system for measuring the inner hole depth of an injector seat on a high-pressure oil rail and marking on the high-pressure oil rail, characterized in that it comprises a fixing unit, a measuring unit, a marking unit, and a control unit.

[0007] The fixing unit locks the high-pressure oil rail to be measured at a measurement position; the measuring unit and the marking unit are installed near the fixing unit and perform inner hole depth inspection of the injector seat and marking operation on the high-pressure oil rail in the measurement position, respectively;

[0008] The control unit is connected to the fixing unit, the measuring unit, and the marking unit, locks the position of the high-pressure oil rail using the fixing unit, and then detects the inner hole depth of the injector seat using the measuring unit; for the high-pressure oil rail that passes the detection, the control unit prompts that the detection is qualified, and further marks the high-pressure oil rail using the marking unit; for the high-pressure oil rail that fails the detection, the control unit prompts that the detection is unqualified.

[0009] Further, the fixing unit comprises a supporting module, a positioning module and a pressing module mounted on the jig base plate;

[0010] The supporting module supports the high-pressure oil rail from below, and its size matches the shape of the high-pressure oil rail, while supporting the high-pressure oil rail and the fuel injector seat; the positioning module is installed around the supporting module to ensure that the high-pressure oil rail is placed on the supporting module in the correct direction and angle; the pressing module is operated by the control unit to press or release the high-pressure oil rail placed on the supporting module.

[0011] Further, the supporting module comprises a plurality of supporting blocks and fuel injector seat clamping blocks fixed on the jig base plate; the supporting blocks are used to support the main body of the high-pressure oil rail; one supporting block is arranged on the inner side of each end of the high-pressure oil rail respectively; additional supporting blocks are arranged as needed in the middle section of the high-pressure oil rail; the upper end of the supporting block has a semicircular opening, and the diameter of the semicircle matches the outer diameter of the high-pressure oil rail; the fuel injector seat clamping block is used to support the fuel injector seat on the high-pressure oil rail, and its shape matches the outer shape of the fuel injector seat and its position matches the position of the fuel injector seat on the high-pressure oil rail.

[0012] Further, the positioning module comprises an error-proof pin and a positioning pin;

[0013] The error-proof pin is fixed on the jig base plate and located outside the supporting module to define the axial position of the high-pressure oil rail when placed; the positioning pin is installed on the opposite side of the pressing module and cooperates with the position of the fuel injector seat, located between different fuel injector seats and close to the main body of the high-pressure oil pipe.

[0014] Further, the pressing module comprises a pressing cylinder and a cylinder support block; the cylinder support block is fixed on the jig base plate; the pressing cylinder is fixed on the cylinder support block; the pressing cylinder is connected to the control unit; when the pressing cylinder operates, the movable end approaches the positioning module to fix the high-pressure oil rail; when the pressing cylinder releases, the movable end moves away from the positioning module to release the high-pressure oil rail.

[0015] Further, the measuring unit comprises a sensing support plate, a cover plate and a plurality of distance sensors; the number of distance sensors matches the number of fuel injector seats on the high-pressure oil rail, and they are all connected to the control unit; the sensing support plate is installed on the fixing unit; the cover plate is fixedly connected to the sensing support plate; the distance sensors are installed on the cover plate; the positions of the distance sensors on the cover plate correspond to the positions of the fuel injector seats.

[0016] Further, the control unit comprises a programmable logic controller and a human-computer interaction module.

[0017] The programmable logic controller is externally connected to the fixing unit, the measuring unit and the marking unit, and internally connected to the human-computer interaction module; the programmable logic controller reads working parameters from the human-computer interaction module, coordinates the fixing unit, the measuring unit and the marking unit to work together according to the working parameters, and displays the detection results of the measuring unit by using the human-computer interaction module.

[0018] Further, the human-computer interaction module comprises a central control screen and a three-color lamp, both of which are connected to the programmable logic controller; the central control screen receives the working parameters sent to the programmable logic controller, and displays the detection results from the programmable logic controller; the three-color lamp displays different colors according to the detection results.

[0019] The application also discloses a method for automatic inner hole depth inspection and linkage marking of a high-pressure oil rail.

[0020] S100, configuring working parameters of the control unit;

[0021] S200, placing the high-pressure oil rail on the fixing unit;

[0022] S300, using the control unit to operate the fixing unit to press the high-pressure oil rail;

[0023] S400, using the control unit to operate the measuring unit to complete inner hole depth measurement of the fuel injector seat on the high-pressure oil rail, obtaining detection results and feeding back to the control unit;

[0024] S500, the control unit displays the detection results;

[0025] S600, if the detection results are unqualified, jumping to S800, otherwise, entering S700;

[0026] S700, using the control unit to operate the marking unit to mark on the high-pressure oil rail;

[0027] S800, using the control unit to operate the fixing unit to release the high-pressure oil rail;

[0028] S900, taking down the high-pressure oil rail.

[0029] Further, in step S500, if the detection result is unqualified, the control unit alarms the operator to prompt unqualification, and prompts the specific position of the unqualified oil injector seat.

[0030] In view of the above technical features, relative to the prior art, the present application has the following advantages:

[0031] 1. The automatic inner hole depth inspection and linkage marking system for high-pressure oil rails can realize automatic depth inspection of the key safety part, the oil injector seat, in the ultrahigh-pressure oil rail, and basically does not need manual intervention except for placing the oil rail product to be tested, thereby greatly saving labor cost and reducing the missed inspection and result judgment errors caused by human judgment.

[0032] 2. The automatic inner hole depth inspection and linkage marking system and method for high-pressure oil rails can simultaneously realize automatic marking linkage and inspection, and only marks the qualified products, thereby improving the inspection quality and preventing unqualified products from flowing into the next process.

[0033] 3. The automatic inner hole depth inspection and linkage marking system and method for high-pressure oil rails can accurately find the product defects and effectively prompt the operators when unqualified products appear. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a system block diagram of a preferred embodiment of the automatic inner hole depth inspection and linkage marking system for high-pressure oil rails;

[0035] Figure 2 is a structural schematic diagram of a preferred embodiment of the automatic inner hole depth inspection and linkage marking system for high-pressure oil rails;

[0036] Figure 3 is a structural schematic diagram of the fixing unit and the measuring unit in a preferred embodiment of the automatic inner hole depth inspection and linkage marking system for high-pressure oil rails;

[0037] Figure 4 is a method flowchart of a preferred embodiment of the method of the automatic inner hole depth inspection and linkage marking system for high-pressure oil rails.

[0038] In the figure: 100 - fixing unit, 200 - measuring unit, 300 - marking unit, 400 - control unit;

[0039] 1-cover plate, 2-distance sensor, 3-support block, 4-cylinder support block, 5-tight cylinder, 6-locking plate, 7-control box, 8-three-color light, 9-positioning pin, 10-sensing support plate, 11-mistake-proof needle, 12-marking machine, 13-high-pressure oil rail, 14-oil injector seat clamping groove block, 15-jig bottom plate. DETAILED DESCRIPTION

[0040] The application will be further described below in connection with specific embodiments. It should be understood that these embodiments are only used to illustrate the application and not to limit the scope of the application. Furthermore, it should be understood that those skilled in the art can make various modifications or changes to the application after reading the content taught by the application, and these equivalent forms also fall within the scope defined by the appended claims.

[0041] Please refer to Figures 1 to 3 The application discloses a high-pressure oil rail automatic inner hole depth inspection and linkage marking system, which is used for automatically measuring the inner hole depth of an oil injector seat on a high-pressure oil rail and marking on the high-pressure oil rail according to the detection result. As shown in the figure, a preferred embodiment thereof comprises a fixing unit 100, a measuring unit 200, a marking unit 300 and a control unit 400.

[0042] The fixing unit 100 is used for limiting the placement position and angle of the high-pressure oil rail 13, and locking the high-pressure oil rail 13 at the measuring position according to the instruction of the control unit 400, so as to be aligned with the measuring unit 200. The measuring unit 200 and the marking unit 300 are both installed near the fixing unit 100. The measuring unit 200 checks the inner hole depth of the oil injector seat on the high-pressure oil rail 13 at the fixed measuring position under the scheduling of the control unit 400, and then feeds back the detection result to the control unit 400. For the high-pressure oil rail 13 that passes the measurement, the control unit 400 continues to schedule the marking unit 300 to mark on the surface of the high-pressure oil rail 13, and completes the production process. The control unit 400 also shows the detection result to the operator, i.e. whether the inner hole depth of the oil injector seat of the high-pressure oil rail 13 meets the design standard.

[0043] The fixing unit 100 is composed of a support block 3, an oil injector seat clamping groove block 14, a mistake-proof needle 11, a positioning pin 9, a tight cylinder 5, a cylinder support block 4 and a jig bottom plate 15. Among them, the support block 3 and the oil injector seat clamping groove block 14 constitute a support module, the mistake-proof needle 11 and the positioning pin 9 constitute a positioning module, and the tight cylinder 5 and the cylinder support block 4 constitute a pressing module. They are all installed and fixed on the jig bottom plate 15.

[0044] The support module supports the high-pressure oil rail 13 from below, and its size matches the shape of the high-pressure oil rail 13, so it can support the main body (tubular part) of the high-pressure oil rail 13 and the injector seat mounted on the main body at the same time, ensuring stable support. Specifically, the support block 3 has multiple. In this embodiment, one support block 3 is arranged on the inner side of each end of the high-pressure oil rail 13, respectively, for lifting the high-pressure oil rail 13. In other embodiments, additional support blocks 3 are also arranged as needed in the middle of the high-pressure oil rail 13, for example, for a high-pressure oil rail 13 that is very long. Each support block 3 is fixed at the lower end on the jig base plate 15, and the upper end is provided with a semicircular opening. The diameter of the semicircle matches the outer diameter of the high-pressure oil rail 13, so that the high-pressure oil rail 13 can be reliably lifted after being placed. The injector seat clamping block 14 is used to support the injector seat mounted on the high-pressure oil rail 13, so its upper end shape matches the shape of the injector seat. The lower end of the injector seat clamping block 14 is fixed on the jig base plate 15, and its position matches the position of the injector seat. In this way, when the main body of the high-pressure oil rail 13 is lifted by the support block 3, the corresponding injector seat can also be lifted by the injector seat clamping block 14 in position, so as to determine the placement angle of the high-pressure oil rail 13. The number of injector seat clamping blocks 14 does not need to correspond to the number of injector seats one by one, as long as it can limit the angle of the high-pressure oil rail 13.

[0045] The positioning module ensures that the high-pressure oil rail 13 is placed on the support module in the correct direction and angle. Specifically, the error-proof needle 11 in the positioning module is arranged on the outer side of the support block 3, thereby limiting the axial position of the high-pressure oil rail 13 when placed, ensuring that the high-pressure oil rail 13 is in the correct measurement position, i.e. the injector seat is aligned with the measurement unit 200. The lower end of the error-proof needle 11 is fixed on the jig base plate 15, and the height is greater than the height of the high-pressure oil rail 13 after being placed. The positioning pin 9 is located on the opposite side of the pressing module, which cooperates with the jacking cylinder 5 to lock the high-pressure oil rail 13 in the measurement position. On the other hand, the position of the positioning pin 9 also matches the position of the injector seat, which is close to the main body of the high-pressure oil rail 13 between the two injector seats. In this way, if the high-pressure oil rail 13 is not in the correct position, the injector seat will rest on the positioning pin 9, thereby blocking the locking of the jacking cylinder 5.

[0046] The pressing module, under the control of the control unit 400, uses the jacking cylinder 5 to press or release the high-pressure oil rail 13 placed on the support module. Specifically, the jacking cylinder 5 is fixed on the cylinder support block 4, and the cylinder support block 4 is fixed on the jig base plate 15. The jacking cylinder 5 is connected to the control unit 400 and is controlled by it. When the jacking cylinder 5 operates, its movable end extends, approaches and finally adheres to the positioning pin 9 in the support module, thereby limiting the high-pressure oil rail 13 from being pulled out upward, completing the locking and allowing the measurement state. When the jacking cylinder 5 is released, its movable end is retracted away from the positioning pin 9, thereby releasing the high-pressure oil rail 13, and the operator can take away the high-pressure oil rail 13 that has completed the measurement from above.

[0047] The measuring unit 200 comprises the induction support plate 10, the cover plate 1 and the distance sensor 2. The distance sensor 2 is in plurality, the number of which is consistent with the number of the injector seat on the high-pressure oil rail 13. The specific model of the distance sensor 2 is Keyence LR-ZB100N, which is connected to the control unit 400. The induction support plate 10 is in plurality, the lower end of which is fixed on the jig bottom plate 15, and is used to support the cover plate 1. In the embodiment, one induction support plate 10 is arranged at each end of the cover plate 1. The cover plate 1 is fixed on the induction support plate 10, and is arranged in parallel with the jig bottom plate 15. The plurality of distance sensors 2 are installed on the cover plate 1. The positions of the distance sensors 2 on the cover plate 1 correspond to the positions of the inner holes of the injector seats fixed on the high-pressure oil rail 13 at the measuring position. In this way, when the high-pressure oil rail 13 is locked, the control unit 400 can use the distance sensor 2 to measure the depth of the inner hole of each injector seat, and obtain the detection result.

[0048] The marking unit 300 is a marking machine 12, and the specific model is Dazhong YLP-D20. The marking machine 12 is dispatched by the control unit 400, and is used to print the mark on the surface of the high-pressure oil rail 13. On the top surface of the marking machine 12, the locking plate 6 is arranged. The jig bottom plate 15 in the fixing unit 100 is fixed on the locking plate 6 by bolts.

[0049] The control unit 400 comprises a programmable logic controller and a human-computer interaction module. The human-computer interaction module is further composed of a central control screen and a three-color light 8. In the embodiment, the programmable logic controller and the central control screen are integrated together to form an integral whole, i.e. the control box 7. In the control box 7, the programmable logic controller is connected to the central control screen and the three-color light 8. Outside the control box 7, the programmable logic controller is connected to the jacking cylinder 5 in the fixing unit 100, the distance sensor 2 in the measuring unit 200, and the marking machine 12. The central control screen is an input-output module, which receives the working parameters provided by the operator, and sends them to the programmable logic controller, and is also used to display the detection result from the programmable logic controller. The three-color light 8 is an output module, which is used as an alarm device, and uses different colors of light to send reminders according to the detection result. After reading the working parameters, the programmable logic controller coordinates the jacking cylinder 5, the distance sensor and the marking unit 300 to work together, and uses the central control screen and the three-color light 8 to display the detection result.

[0050] Please refer to Figure 4 The application further discloses a method for automatically checking the inner hole depth and marking the high-pressure oil rail.

[0051] Step S1, configuring working parameters

[0052] The operator configures the working parameters of the programmable logic unit through the central control screen. The working parameters are related to the product parameters of the high-pressure oil rail to be tested, such as the length of the high-pressure oil rail, the number of fuel injector seats, and the inner hole depth.

[0053] Step S2, place the high-pressure oil rail.

[0054] The operator places the high-pressure oil rail to be tested on the fixing unit. With the assistance of the error-proofing needle and the positioning pin in the positioning module, the high-pressure oil rail is lifted by the supporting module and stays in the correct position and angle at the measurement position.

[0055] Step S3, lock the high-pressure oil rail.

[0056] The control unit sends instructions to the pressing module in the fixing unit, and the pressing cylinder acts to press against the positioning pin, completing the pressing and fixing of the high-pressure oil rail.

[0057] Step S4, measure the inner hole depth

[0058] The control unit operates the distance sensor in the measuring unit to complete the inner hole depth measurement of the fuel injector seat, obtains the test result and feeds back to the control unit.

[0059] Step S5, display the test result.

[0060] The control unit reads the test result and displays it on the central control screen and the three-color light. If the test result is unqualified, the abnormal fuel injector seat position is further displayed on the central control screen. The fuel injector seat position corresponds to the distance sensor, so as long as it is known which distance sensor reported abnormal data, it can be inferred that the corresponding fuel injector seat is unqualified. If the test result is qualified, the three-color light displays green, otherwise it displays red.

[0061] Step S6, determine the test result.

[0062] If the test result is unqualified, no marking operation is performed and it directly jumps to step S8, otherwise it enters step S7 to mark the qualified high-pressure oil rail.

[0063] Step S7, mark the qualified product.

[0064] The control unit sends instructions to the marking unit to operate the marking unit to mark the qualified high-pressure oil rail.

[0065] Step S8, release the high-pressure oil rail.

[0066] The control unit sends instructions to the pressing module in the fixing unit, and the pressing cylinder acts to move away from the positioning pin, releasing the high-pressure oil rail.

[0067] Step S9, remove the high-pressure oil rail.

[0068] The operator takes the high-pressure oil rail from the fixed unit, and makes different treatments according to the detection result, such as putting into a substandard product box or a finished product box.

[0069] The above merely describes the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which is made by using the content of the present application specification and drawings, is also included in the patent protection scope of the present application.

Claims

1. A high-pressure fuel rail automated inner hole depth inspection and linkage marking system, used to measure the inner hole depth of the injector seat on the high-pressure fuel rail and mark the high-pressure fuel rail, characterized in that, It includes a fixing unit, a measuring unit, a marking unit, and a control unit; The fixing unit locks the high-pressure oil rail to be tested at the measurement position; the measuring unit and the marking unit are installed near the fixing unit, and respectively perform the inner hole depth inspection of the injector seat and the marking operation on the high-pressure oil rail at the measurement position; The control unit is connected to the fixing unit, the measuring unit, and the marking unit. The fixing unit locks the position of the high-pressure fuel rail, and the measuring unit detects the inner hole depth of the injector seat. For high-pressure fuel rails that pass the test, the control unit indicates that the test is qualified and further marks the high-pressure fuel rail using the marking unit. For high-pressure fuel rails that fail the test, the control unit indicates that the test is unqualified.

2. The automated internal bore depth inspection and linkage marking system for high-pressure oil rails according to claim 1, characterized in that, The fixing unit includes a support module, a positioning module, and a clamping module mounted on the base plate of the fixture; The support module supports the high-pressure oil rail from below, and its size matches the shape of the high-pressure oil rail. It also supports the high-pressure oil rail and the injector seat. The positioning module is installed around the support module to ensure that the high-pressure oil rail is placed on the support module in the correct direction and angle. The clamping module, under the operation of the control unit, clamps or releases the high-pressure oil rail placed on the support module.

3. The automated inner hole depth inspection and linkage marking system for high-pressure oil rails according to claim 2, characterized in that, The support module includes multiple support blocks and an injector seat slot block fixed to the base plate of the fixture; the support blocks are used to support the main body of the high-pressure oil rail; one support block is provided on the inner side near both ends of the high-pressure oil rail; additional support blocks are provided as needed in the middle section of the high-pressure oil rail; the upper end of the support block has a semi-circular opening, the diameter of which matches the outer diameter of the high-pressure oil rail; the injector seat slot block is used to support the injector seat on the high-pressure oil rail, the shape of which matches the shape of the injector seat, and the position of which matches the position of the injector seat on the high-pressure oil rail.

4. The automated inner hole depth inspection and linkage marking system for high-pressure oil rails according to claim 2, characterized in that, The positioning module includes an anti-misalignment pin and a positioning pin; The anti-misalignment pin is fixed on the base plate of the fixture and located on the outside of the support module to limit the axial position of the high-pressure oil rail when it is placed; the positioning pin is installed on the opposite side of the clamping module and cooperates with the position of the oil injector seat, located between different oil injectors and close to the body of the high-pressure oil pipe.

5. The automated inner hole depth inspection and linkage marking system for high-pressure oil rails according to claim 2, characterized in that, The clamping module includes a clamping cylinder and a cylinder support block; the cylinder support block is fixed to the base plate of the fixture; the clamping cylinder is fixed to the cylinder support block; the clamping cylinder is connected to the control unit; when the clamping cylinder is activated, the movable end moves towards the positioning module, thereby fixing the high-pressure oil rail; when the clamping cylinder is released, the movable end moves away from the positioning module, thereby releasing the high-pressure oil rail.

6. The automated internal bore depth inspection and linkage marking system for high-pressure oil rails according to claim 1, characterized in that, The measuring unit includes a sensing support plate, a cover plate, and multiple distance sensors; the number of distance sensors is the same as the number of injector seats on the high-pressure fuel rail, and all are connected to the control unit; there are multiple sensing support plates, which are installed on the fixing unit; the cover plate is fixedly connected to the sensing support plate; the distance sensors are installed on the cover plate; the position of the distance sensors on the cover plate corresponds to the position of the injector seats.

7. The automated internal bore depth inspection and linkage marking system for high-pressure oil rails according to claim 1, characterized in that, The control unit includes a programmable logic controller and a human-machine interface module; The programmable logic controller (PLC) is externally connected to the fixing unit, the measuring unit, and the marking unit, and internally connected to the human-machine interface module. The PLC reads operating parameters from the human-machine interface module, coordinates the fixing unit, the measuring unit, and the marking unit to work together according to the operating parameters, and displays the detection results of the measuring unit using the human-machine interface module.

8. The automated internal bore depth inspection and linkage marking system for high-pressure oil rails according to claim 7, characterized in that, The human-computer interaction module includes a central control screen and a tri-color light, both of which are connected to the programmable logic controller (PLC). The central control screen receives the operating parameters and sends them to the PLC, and displays the detection results from the PLC. The tri-color light displays different colors according to the detection results.

9. A method for automated internal bore depth inspection and linkage marking system for high-pressure oil rails as described in claim 1, characterized in that, Includes the following steps: Step S100: Configure the operating parameters of the control unit; Step S200: Place the high-pressure oil rail on the fixed unit; Step S300: Using the control unit, operate the fixing unit to press the high-pressure oil rail; Step S400: Using the control unit, operate the measuring unit to complete the inner hole depth measurement of the injector seat on the high-pressure oil rail, obtain the detection result, and feed it back to the control unit; In step S500, the control unit displays the detection result; In step S600, if the test result is unqualified, proceed to step S800; otherwise, proceed to step S700. Step S700: Using the control unit, operate the marking unit to mark on the high-pressure oil rail; Step S800: Using the control unit, operate the fixing unit to release the high-pressure oil rail; Step S900: Remove the high-pressure oil rail.

10. The method for automated internal hole depth inspection and linkage marking system using high-pressure oil rails according to claim 9, characterized in that, In step S500, if the test result is unqualified, the control unit will alarm the operator to indicate the unqualified result and indicate the specific location of the unqualified injector seat.

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