A detection device and detection method for ICV valve of automobile fuel tank

Abstract

The present invention relates to an automobile fuel tank ICV valve detection device and detection method, the difference of which is that the device includes a workbench; a mounting part, which has two and symmetrically spaced mounting parts arranged on the workbench, and the two mounting parts can move toward or away from each other to adjust the distance between them; a positioning tool, including two profiling tables that cooperate with each other to place the fuel tank, and the two profiling tables are detachably arranged on the two mounting parts respectively; a clamping mechanism, which is arranged on the workbench and is used to clamp the fuel filling pipe; a valve cover plate detection part, including a first driving member, and a camera and a vent pipe arranged on the first driving member, under the action of the first driving member, the camera and the vent pipe can be inserted into the fuel filling pipe at the same time or withdrawn from the fuel filling pipe at the same time; and an opening and sealing detection part, including an opening detection part and a sealing detection part that are detachably connected to the fuel vapor adsorption pipe respectively. The present invention can effectively detect the performance of the fuel tank ICV valve and is easy to use.

Description

Technical Field

[0001] The invention relates to the field of automobile fuel tank detection, in particular to an automobile fuel tank ICV valve detection device and a detection method. Background Art

[0002] The ICV valve of a car fuel tank is a necessary component that connects the car fuel tank and the refueling pipe. When refueling the vehicle, the refueling gun adds the oil into the fuel tank through the refueling pipe and the ICV valve in sequence. The main function of the ICV valve is to assist the fuel to enter the fuel tank when refueling and prevent the fuel from flowing out of the fuel tank through the refueling pipe. The ICV valve consists of a valve body, a valve cover, a spring and a sealing ring. Due to the particularity of its structure, the valve cover may fall off during the production and assembly of the fuel tank. The falling off of the valve cover will affect the filling performance, sealing performance and refueling hydrocarbon emission performance of the fuel tank assembly. In addition, since the ICV valve is inside the fuel tank, the valve cover often cannot be detected when the fuel tank assembly is offline after it falls off, resulting in unqualified fuel tanks flowing out to the vehicle manufacturer. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an automobile fuel tank ICV valve detection device that can effectively detect the performance of the fuel tank ICV valve and is easy to use.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: an ICV valve detection device for an automobile fuel tank, wherein the fuel tank is connected with a refueling pipe and a fuel vapor adsorption pipe, and an ICV valve is provided at the connection between the fuel tank and the refueling pipe, and the difference is that:

[0005] It includes a workbench;

[0006] There are two mounting parts which are symmetrically arranged on the workbench, and the two mounting parts can move toward or away from each other to adjust the distance between them;

[0007] A positioning tool, comprising two shaped tables cooperating with each other to place the fuel tank, wherein the two shaped tables are detachably arranged on the two mounting parts respectively;

[0008] A clamping mechanism, disposed on the workbench, for clamping the refueling pipe;

[0009] The valve cover plate detection unit includes a first driving member, and a camera and a vent pipe provided on the first driving member, wherein the camera and the vent pipe can be simultaneously inserted into the refueling pipe or simultaneously withdrawn from the refueling pipe under the action of the first driving member;

[0010] and

[0011] The opening and sealing detection part includes an opening detection component and a sealing detection component which are respectively detachably connected to the fuel vapor adsorption tube, wherein the opening detection component is an exhaust pipe provided with a flow meter, and the sealing detection component includes a pressure sensor which is detachably arranged in the fuel vapor adsorption tube.

[0012] According to the above technical solution, each of the mounting parts includes a mounting plate and two limit blocks, the two limit blocks are symmetrically arranged on the mounting plate, and the interval between the two limit blocks is constructed as a positioning groove that cooperates with the profiling table.

[0013] According to the above technical solution, the device also includes an adjustment mechanism for driving the two mounting parts to move.

[0014] According to the above technical scheme, the adjustment mechanism includes a double-headed motor, two threaded rods and two sliding blocks. The double-headed motor is arranged at the lower end of the workbench, and the two threaded rods are respectively fixed to the two output ends of the double-headed motor. The workbench is provided with sliding holes that cooperate with the sliding blocks. The two sliding blocks are threadedly connected to the two threaded rods one by one and are arranged one by one with the two mounting parts. Each of the sliding blocks passes through the corresponding sliding holes and is fixed to the lower end of the corresponding mounting parts. Under the action of the double-headed motor, the two sliding blocks can drive the two mounting parts to move toward or away from each other.

[0015] According to the above technical solution, the clamping mechanism includes a first clamping block and a second clamping block that can open and close relative to each other, the first clamping block is fixed to the workbench, the first clamping block is provided with a first clamping groove, the second clamping block is provided with a second clamping groove, and the second clamping groove and the first clamping groove can be connected to form a clamping hole for clamping the refueling pipe.

[0016] According to the above technical solution, the valve cover plate detection unit also includes a first sealing member for sealing the refueling pipe.

[0017] According to the above technical solution, the first sealing member is a sealing plug, the first driving member is a cylinder, the first driving member includes a first cylinder body and a first piston rod that cooperate with each other, the end of the first piston rod is connected to the ventilation pipe and the mounting rod parallel to the first piston rod, the ventilation pipe and the mounting rod pass through the first sealing member, and the camera is fixed to the end of the mounting rod.

[0018] According to the above technical solution, the opening and sealing detection unit further includes a second sealing member for sealing the fuel vapor adsorption tube.

[0019] According to the above technical solution, the second sealing member is a sealing plug, and the second sealing member is fixed to the pressure sensor.

[0020] Compared with the prior art, the beneficial features of the present invention are as follows: the automobile fuel tank ICV valve detection device has replaceable positioning tooling and an adjustable distance between two profiling tables, and can be applicable to a variety of fuel tanks; after the camera and the ventilation pipe are simultaneously inserted into the fuel pipe, a photo of the valve cover of the ICV valve is taken by the camera to detect whether the valve cover is qualified; the ventilation pipe ventilates into the fuel tank through the ICV valve, and the opening performance of the ICV valve can be detected through the exhaust pipe provided with a flow meter; the sealing performance of the ICV valve can also be detected through a pressure sensor inserted into the fuel vapor adsorption tube; the performance of the ICV valve of the fuel tank can be effectively detected, and it is easy to use.

[0021] The present invention also provides a detection method using any of the above-mentioned automobile fuel tank ICV valve detection devices, the difference being that: it comprises

[0022] Step a), placing the fuel tank on the positioning fixture, and fixing the refueling pipe with the clamping mechanism;

[0023] Step b), docking the exhaust pipe to the nozzle of the fuel vapor adsorption pipe and fixing the two;

[0024] Step c), inserting the camera and the vent pipe into the refueling pipe at the same time, and sealing the refueling pipe opening;

[0025] Step d), using the camera to take a photo of the ICV valve cover plate, and comparing the photo with a photo of a qualified ICV valve cover plate, if there is no difference between the two, the valve cover plate is qualified, otherwise it is unqualified;

[0026] Step e), after the valve cover plate is tested to be qualified, the vent pipe is ventilated into the fuel tank through the ICV valve, and the gas flow rate at the outlet of the fuel vapor adsorption pipe is monitored. If the gas flow rate meets the set value, the ICV valve opening performance is qualified, otherwise it is unqualified;

[0027] Step f), after detecting that the opening performance of the ICV valve is qualified, remove the exhaust pipe, then insert the pressure sensor into the fuel vapor adsorption tube and seal the pipe opening of the fuel vapor adsorption tube, and then continue to allow the ventilation pipe to ventilate the fuel tank through the ICV valve. When the internal pressure of the fuel tank rises to a set value, stop charging. At this time, the valve cover is closed under the action of the ICV valve spring force, and then the refueling pipe is opened. Then, the camera and the ventilation pipe are withdrawn from the refueling pipe at the same time. After the fuel tank is pressurized for a certain period of time, the pressure sensor detects the internal pressure of the fuel tank. If the internal pressure of the fuel tank is within the set range, the sealing performance of the ICV valve is qualified, otherwise it is unqualified.

[0028] Compared with the prior art, the beneficial features of the present invention are as follows: the detection method of the automobile fuel tank ICV valve detection device, after inserting the camera and the ventilation pipe into the fuel pipe at the same time, takes a photo of the ICV valve cover plate through the camera, and can detect whether the valve cover plate is qualified; the ventilation pipe ventilates into the fuel tank through the ICV valve, and can detect whether the opening performance of the ICV valve is qualified through the exhaust pipe equipped with a flow meter; and can also detect whether the sealing of the ICV valve is qualified through the pressure sensor extended into the fuel vapor adsorption tube; it can effectively detect the performance of the ICV valve of the fuel tank, and is easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of an ICV valve detection device for an automobile fuel tank according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Schematic diagram of the local A structure;

[0031] Figure 3 This is a partial structural schematic diagram of an ICV valve detection device for an automobile fuel tank according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic structural diagram of an ICV valve detection device for an automobile fuel tank according to an embodiment of the present invention;

[0033] Figure 5 This is a partial structural schematic diagram of an ICV valve detection device for an automobile fuel tank according to an embodiment of the present invention;

[0034] Figure 6 It is a schematic diagram of the partial structure of the clamping mechanism in an embodiment of the present invention;

[0035] Figure 7 for Figure 6 Schematic diagram of the local structure;

[0036] Figure 8 It is a schematic diagram of the partial structure of the clamping mechanism in an embodiment of the present invention;

[0037] Fig. 9 This is a schematic diagram of the structure of the installation part in an embodiment of the present invention;

[0038] Fig.10 It is a cross-sectional view of the local structure of the mounting part in the embodiment of the present invention;

[0039] Fig.11 It is a partial structural cross-sectional view when the positioning tool is assembled on the mounting portion in the embodiment of the present invention;

[0040] Fig.12 It is a partial structural cross-sectional view when the positioning tool is not assembled on the mounting portion in the embodiment of the present invention;

[0041] Among them: 1- fuel tank (101- refueling pipe, 102- fuel vapor adsorption pipe), 2- workbench (201- sliding hole), 3- mounting part (301- mounting plate, 302- limiting block (3021- first limiting hole, 3022- second limiting hole, 3023- shifting block hole), 303- positioning groove, 304- first spring, 305- second spring, 306- third spring, 307- ejector rod, 308- clamping block (3081- assembly hole), 309- spring block, 310- clamping boss, 311- limiting boss, 312- shifting block), 4- clamping mechanism (401- first clamping block (4011- first clamping groove), 402- second clamping block (4021- second clamping groove), 403- Guide frame (4031-assembly groove, 4032-guide groove), 404-lifting frame, 405-first limiting body, 406-second limiting body (4061-second limiting surface), 407-gear, 408-rack, 409-rotating shaft, 410-guide block, 411-second cylinder body, 412-second piston rod), 5-valve cover plate detection part (501-camera, 502-ventilation pipe, 503-first sealing member, 504-first cylinder body, 505-first piston rod, 506-mounting rod, 507-air supply pipe), 6-profiling table (601-block, 602-clamping hole), 7-adjusting mechanism (701-double-headed motor, 702-threaded rod, 703-sliding block), 8-opening and sealing detection part (801-second sealing member, 802-pressure sensor). DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0043] Please refer to Figures 1 to 12The embodiment of the present invention provides an ICV valve detection device for a fuel tank of an automobile, which is used to detect the performance of the ICV valve of a fuel tank 1. A fuel tank 1 is connected with a refueling pipe 101 and a fuel vapor adsorption pipe 102, and an ICV valve is arranged at the connection between the fuel tank 1 and the refueling pipe 101. The detection device includes a workbench 2, a mounting portion 3, a positioning fixture, a clamping mechanism 4, a valve cover plate detection portion 5, and an opening and sealing detection portion 8. There are two mounting portions 3, the two mounting portions 3 are symmetrical in front and back and are arranged on the workbench 2 at intervals, the two mounting portions 3 can move toward each other on the workbench 2 to shorten the distance between the two mounting portions 3, and the two mounting portions 3 can also move back to back on the workbench 2 to increase the distance between the two mounting portions 3. The positioning fixture includes two profiling tables 6, the two profiling tables 6 are symmetrically arranged in front and back and are arranged one by one with the two mounting portions 3, each profiling table 6 is detachably arranged on the corresponding mounting portion 3, and the two profiling tables 6 cooperate with each other to place the fuel tank 1. The clamping mechanism 4 is arranged on the workbench 2, and is used to clamp the refueling pipe 101. The valve cover plate detection unit 5 includes a first driving member, a camera 501 and a vent pipe 502. The camera 501 and the vent pipe 502 are both arranged on the first driving member. Under the action of the first driving member, the camera 501 and the vent pipe 502 can simultaneously move to the left and insert into the refueling pipe 101, or simultaneously move to the right and withdraw from the refueling pipe 101. The opening and sealing detection unit 8 includes an opening detection member and a sealing detection member, and the opening detection member and the sealing detection member are detachably connected to the fuel vapor adsorption pipe 102 respectively. Among them, the opening detection member is an exhaust pipe provided with a flow meter, and the exhaust pipe can be docked with the fuel vapor adsorption pipe 102 and detachably connected. The sealing detection member includes a pressure sensor 802, and the pressure sensor 802 is detachably arranged in the fuel vapor adsorption pipe 102.

[0044] In the embodiment of the present invention, each mounting portion 3 includes a mounting plate 301 and two stop blocks 302, the two stop blocks 302 are symmetrically fixed to the left and right ends of the mounting plate 301, and the interval between the two stop blocks 302 is configured as a positioning groove 303 that cooperates with the profiling table 6. When in use, the profiling table 6 is detachably arranged in the positioning groove 303.

[0045] In a most preferred embodiment of the present invention, each limit block 302 is further provided with a first spring 304, a second spring 305, a third spring 306, a push rod 307, a clamping block 308, a spring block 309 and a clamping boss 310. Fig. 9Each of the limiting blocks 302 is provided with a first limiting hole 3021 extending left and right. The openings of the two first limiting holes 3021 on the same mounting portion 3 are arranged facing each other, that is, arranged toward the positioning groove 303. Each of the first limiting holes 3021 is provided with a first spring 304 extending left and right. One end of the first spring 304 is connected to the first limiting hole 3021, and the other end of the first spring 304 is connected to the clamping block 308. The clamping block 308 is limited in the first limiting hole 3021. A clamping boss 310 is provided at one end of each clamping block 308 away from the first spring 304. The clamping boss 310 can be retracted into the first limiting hole 3021; ​​under the action of the first spring 304, the clamping boss 310 can extend out of the first limiting hole 3021. The rear end of each limiting block 302 is also provided with a second limiting hole 3022 extending forward and backward, and the second limiting hole 3022 is communicated with the first limiting hole 3021. The push rod 307 is arranged in the second limiting hole 3022 so as to be movable forward and backward. A limiting boss 311 is fixedly formed on the push rod 307. The second spring 305 is sleeved on the push rod 307, and the rear end of the second spring 305 abuts against the limiting boss 311, and the front end of the second spring 305 abuts against the second limiting hole 3022. Under the action of the second spring 305, the rear end of the push rod 307 can extend backward out of the second limiting hole 3022. The rear end of each block 308 is provided with an assembly hole 3081 extending forward. The third spring 306 is arranged in the assembly hole 3081, the front end of the third spring 306 is fixed to the assembly hole 3081, and the rear end of the third spring 306 is fixed to the spring block 309. The spring block 309 can be retracted into the assembly hole 3081; under the action of the third spring 306, the spring block 309 can extend out of the assembly hole 3081 and extend into the second limiting hole 3022. When the spring block 309 extends into the second limiting hole 3022, the clamping boss 310 retracts into the first limiting hole 3021, and the clamping block 308 is restricted from moving forward and backward. Please refer to Fig.12 A shift block 312 is also fixed to the upper end of the clamp block 308. The limit block 302 is also provided with a shift block hole 3023 extending left and right and cooperating with the shift block 312. The shift block hole 3023 is communicated with the first limit hole 3021. Figure 3 Two symmetrically arranged stoppers 601 are fixed on the opposite surfaces of the two profiling platforms 6, and the stoppers 601 are arranged one by one with the top rods 307. The left and right sides of each profiling platform 6 are also provided with a clamping hole 602 that cooperates with the clamping boss 310. Please refer to Figures 10 to 12 , take the limit block 302 on the left side of the front mounting portion 3 as an example. In the initial state, when the profiling table 6 is not installed, please refer to Fig.12, the rear end of the push rod 307 extends out of the second limiting hole 3022, the spring block 309 is stuck in the second limiting hole 3022, and the clamping boss 310 is retracted into the first limiting hole 3021. During installation, the profiling platform 6 is inserted into the positioning groove 303 from the back to the front, and the stopper 601 squeezes the push rod 307, so that the rear end of the push rod 307 is retracted into the second limiting hole 3022. At this time, the spring block 309 is squeezed out of the second limiting hole 3022 by the push rod 307. Under the action of the first spring 304, the clamping boss 310 extends from the first limiting hole 3021 into the clamping hole 602, so that the profiling platform 6 is fixed on the mounting portion 3. Please refer to Fig.10 and Fig.11 When the profiling platform 6 needs to be removed, the block 312 is pushed to the left to completely withdraw the clamping boss 310 from the clamping hole 602 of the profiling platform 6, and the profiling platform 6 can be removed. At this time, the spring block 309 is clamped into the second limit hole 3022, and the rear end of the push rod 307 extends out of the second limit hole 3022, and the mounting part 3 is reset. Please refer to Fig.12 .

[0046] In order to facilitate the movement of the mounting part 3, the automobile fuel tank ICV valve detection device also includes an adjustment mechanism 7 for driving the two mounting parts 3 to move. In some preferred embodiments of the present invention, the adjustment mechanism 7 includes a double-headed motor 701, two threaded rods 702 and two sliders 703. The double-headed motor 701 is fixedly arranged at the lower end of the workbench 2. The two threaded rods 702 are respectively fixed to the two output ends of the double-headed motor 701. The workbench 2 is provided with a sliding hole 201 that cooperates with the slider 703. The sliding hole 201 extends in the front-to-back direction. The two sliders 703 are threadedly connected with the two threaded rods 702 in a one-to-one correspondence. The two sliders 703 are also arranged in a one-to-one correspondence with the two mounting parts 3. Each slider 703 passes through the corresponding sliding hole 201 and is fixed to the lower end of the corresponding mounting part 3. Under the action of the double-headed motor 701, the two sliders 703 can move forward and backward in the corresponding sliding hole 201 and drive the corresponding mounting part 3 to move toward or away from each other.

[0047] In some preferred embodiments of the present invention, the clamping mechanism 4 includes a first clamping block 401 and a second clamping block 402, and the first clamping block 401 and the second clamping block 402 can open and close relative to each other, wherein the first clamping block 401 is fixed on the workbench 2, and a first clamping groove 4011 is provided at the upper end of the first clamping block 401, and a second clamping groove 4021 is provided at the lower end of the second clamping block 402, and the second clamping groove 4021 and the first clamping groove 4011 can be connected to form a clamping hole for clamping the refueling pipe 101.

[0048] In a most preferred embodiment of the present invention, the clamping mechanism 4 further includes a second driving member, a guide frame 403, a lifting frame 404, a first limiting body 405, a second limiting body 406, a gear 407, a rack 408, a rotating shaft 409, and a guide block 410. The second driving member is a cylinder, and the second driving member includes a second cylinder body 411 and a second piston rod 412 that cooperate with each other. The second piston rod 412 can extend upward or retract downward, and the upper end of the second piston rod 412 abuts against the lower end surface of the lifting frame 404. A clearance hole suitable for the second piston rod 412 to pass through is opened on the workbench 2, and the second cylinder body 411 is fixed to the lower end of the workbench 2. The rotating shaft 409 extends in the left-right direction, the gear 407 is rotatably arranged on the lifting frame 404 through the rotating shaft 409, the second clamping block 402 is fixed on the gear 407, the first limiting body 405 is fixed on the lifting frame 404, the rear end surface of the first limiting body 405 is the first limiting surface, and the guide blocks 410 are symmetrically fixed on the left and right sides of the lifting frame 404. A vertically extending assembly groove 4031 is provided at the front end of the guide frame 403, and vertically extending guide grooves 4032 are symmetrically provided on the two groove walls of the assembly groove 4031, and the guide grooves 4032 are slidably matched with the guide blocks 410 in a one-to-one correspondence, and the rack 408 is fixed to the groove bottom of the assembly groove 4031 and extends vertically. The second limiting body 406 is symmetrically fixed to the left and right sides of the rack 408. The second limiting body 406 and the first limiting body 405 are matched one by one. The front end surface of the second limiting body 406 is the second limiting surface 4061. The second limiting surface 4061 is slidably matched with the first limiting surface. When the second piston rod 412 extends upward, the lifting frame 404 moves upward along the guide frame 403, and the guide block 410 slides upward in the guide groove 4032. The first limiting body 405 slides upward along the second limiting body 406, and the gear 407 moves upward along the rack 408 to drive the second clamping block 402 to rotate upward, so that the second clamping block 402 is opened relative to the first clamping block 401, which is convenient for placing the refueling pipe 101. When the second piston rod 412 is retracted downward, the lifting frame 404 moves downward, and at the same time, the guide block 410 slides downward in the guide groove 4032, the first limiter 405 slides downward along the second limiter 406, and the gear 407 moves downward along the rack 408 to drive the second clamping block 402 to rotate downward, so that the second clamping block 402 is closed relative to the first clamping block 401 to clamp the refueling pipe 101. Figure 2 shown.

[0049] Specifically, the valve cover plate detection unit 5 further includes a first sealing member 503 , which is used to seal the nozzle of the fuel filling pipe 101 , and the first sealing member 503 is detachably connected to the fuel filling pipe 101 . Preferably, the first sealing member 503 is a sealing plug, the first driving member is a cylinder, the first driving member includes a first cylinder body 504 and a first piston rod 505 that cooperate with each other, the first cylinder body 504 is fixed on the workbench 2, the first piston rod 505 can extend to the left or retract to the right, and the end of the first piston rod 505 is fixed with a ventilation pipe 502 and a mounting rod 506, the ventilation pipe 502 and the mounting rod 506 both extend along the extension direction of the first piston rod 505, the ventilation pipe 502 and the mounting rod 506 pass through the first sealing member 503, and the first sealing member 503 is arranged near the right end of the ventilation pipe 502 and the mounting rod 506, an air inlet is provided on one side of the right end of the ventilation pipe 502, the air inlet is connected to the air source through the air supply pipe 507, and the camera 501 is fixed to the left end of the mounting rod 506.

[0050] Specifically, the opening and sealing detection unit 8 further includes a second sealing member 801, which is used to seal the pipe opening of the fuel vapor adsorption pipe 102, and the second sealing member 801 is detachably connected to the fuel vapor adsorption pipe 102. More specifically, the second sealing member 801 is a sealing plug, and the second sealing member 801 is fixed to the pressure sensor 802.

[0051] The automobile fuel tank ICV valve detection method of the embodiment of the present invention adopts any of the above detection devices, and the detection method comprises the following steps in sequence:

[0052] Step a): Place the fuel tank 1 on the positioning fixture and fix the fuel pipe 101 with the clamping mechanism 4.

[0053] Step b) docking and fixing the exhaust pipe and the fuel vapor adsorption pipe 102.

[0054] Step c) inserting the camera 501 and the vent pipe 502 into the refueling pipe 101 at the same time, and sealing the pipe opening of the refueling pipe 101.

[0055] Step d), use camera 501 to take a photo of the ICV valve cover plate, compare the photo with the photo of the qualified ICV valve cover plate, if there is no difference between the two, the valve cover plate is qualified, otherwise it is unqualified.

[0056] Step e), after the valve cover is tested to be qualified, the vent pipe 502 is ventilated into the fuel tank 1 through the ICV valve, and the gas flow rate at the outlet of the fuel vapor adsorption pipe 102 is monitored. If the gas flow rate value meets the set value, the ICV valve opening performance is qualified, otherwise it is unqualified.

[0057] Step f), after checking that the opening performance of the ICV valve is qualified, remove the exhaust pipe, then insert the pressure sensor 802 into the fuel vapor adsorption tube 102 and seal the tube mouth of the fuel vapor adsorption tube 102, and then continue to allow the vent pipe 502 to ventilate the fuel tank 1 through the ICV valve. When the internal pressure of the fuel tank 1 rises to the set value, stop charging. At this time, the valve cover is closed under the action of the ICV valve spring force, and then open the tube mouth of the filling pipe 101, so that the camera 501 and the vent pipe 502 are withdrawn from the filling pipe 101 at the same time. After the fuel tank 1 is pressurized for a certain period of time, the pressure sensor 802 detects the internal pressure of the fuel tank 1. If the internal pressure of the fuel tank 1 is within the set range, the ICV valve sealing is qualified, otherwise it is unqualified.

[0058] In a preferred embodiment of the present invention, the vehicle fuel tank ICV valve detection method comprises the following steps in sequence:

[0059] Step a): Place the fuel tank 1 on the positioning fixture and fix the fuel pipe 101 with the clamping mechanism 4.

[0060] Step b), docking the exhaust pipe to the pipe opening of the fuel vapor adsorption pipe 102 and fixing the exhaust pipe and the fuel vapor adsorption pipe 102.

[0061] Step c), the first piston rod 505 extends to the left, the camera 501 and the vent pipe 502 simultaneously move to the left and insert into the refueling pipe 101, and the first sealing member 503 moves to the left along with the first piston rod 505 to seal the pipe opening of the refueling pipe 101.

[0062] Step d), use camera 501 to take a photo of the ICV valve cover plate, and compare the taken photo with the photo of the qualified ICV valve cover plate. If there is no difference between the two, the valve cover plate is intact and qualified, and continue to the next step of inspection. Otherwise, the valve cover plate is unqualified.

[0063] Step e), after the valve cover plate is tested and found to be qualified, the ventilation pipe 502 is ventilated to the fuel tank 1 through the ICV valve, and the ventilation flow rate is 1L / min. After 10s of ventilation, the outlet flow rate of the fuel vapor adsorption pipe 102 is monitored by the flow meter on the exhaust pipe. If the outlet flow rate is greater than 0.9L / min, the ICV valve opening performance is qualified, and the next step of inspection is continued. Otherwise, the ICV valve opening performance is unqualified.

[0064] Step f), after testing the ICV valve opening performance, remove the exhaust pipe, then insert the pressure sensor 802 into the fuel vapor adsorption tube 102 and seal the fuel vapor adsorption tube 102 with the second seal 801, and then continue to ventilate the vent pipe 502 into the fuel tank 1 through the ICV valve. When the internal pressure of the fuel tank 1 rises to 3kPa, stop the inflation. At this time, under the action of the ICV valve spring force, the valve cover is closed, and then the first piston rod 505 is retracted to the right, and the first seal 503 is pulled out from the nozzle of the refueling pipe 101 with the first piston rod 505 moving to the right. The camera 501 and the vent pipe 502 are withdrawn from the refueling pipe 101 at the same time with the first piston rod 505. At the same time, after the fuel tank 1 is kept under pressure for 10s, the pressure sensor 802 is used to detect the internal pressure of the fuel tank 1. If the internal pressure of the fuel tank 1 is within the range of 2.5kPa to 3kPa, the ICV valve sealing is qualified. Otherwise, the ICV valve sealing is unqualified.

[0065] Step g), after the ICV valve sealing test is completed, the internal pressure of the fuel tank 1 is released and the test is completed.

[0066] The above contents are further detailed descriptions of the present invention in combination with specific implementation methods. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as belonging to the protection scope of the present invention.

Claims

1. An ICV valve detection device for a vehicle fuel tank, wherein the fuel tank is connected with a refueling pipe and a fuel vapor adsorption pipe. The connection between the fuel tank and the filling pipe is provided with an ICV valve, which is characterized by: It includes a workbench; There are two mounting parts which are symmetrically arranged on the workbench, and the two mounting parts can move toward or away from each other to adjust the distance between them; A positioning tool, comprising two shaped tables cooperating with each other to place the fuel tank, wherein the two shaped tables are detachably arranged on the two mounting parts respectively; A clamping mechanism, disposed on the workbench, for clamping the refueling pipe; The valve cover plate detection unit includes a first driving member, and a camera and a vent pipe provided on the first driving member, wherein the camera and the vent pipe can be simultaneously inserted into the refueling pipe or simultaneously withdrawn from the refueling pipe under the action of the first driving member; and an opening and sealing detection unit, comprising an opening detection member and a sealing detection member respectively detachably connected to the fuel vapor adsorption tube, wherein the opening detection member is an exhaust pipe provided with a flow meter, and the sealing detection member comprises a pressure sensor, and the pressure sensor is detachably arranged in the fuel vapor adsorption tube; The clamping mechanism comprises a first clamping block and a second clamping block which can be opened and closed relative to each other, the first clamping block is fixed to the workbench, a first clamping groove is formed on the first clamping block, a second clamping groove is formed on the second clamping block, and the second clamping groove and the first clamping groove can be connected to form a clamping hole for clamping the fuel filling pipe; The valve cover plate detection unit also includes a first sealing member for sealing the fuel filling pipe; The first sealing member is a sealing plug, the first driving member is a cylinder, the first driving member includes a first cylinder body and a first piston rod that cooperate with each other, the end of the first piston rod is connected to the ventilation pipe and the mounting rod parallel to the first piston rod, the ventilation pipe and the mounting rod pass through the first sealing member, and the camera is fixed to the end of the mounting rod.

2. The automobile fuel tank ICV valve detection device according to claim 1, characterized in that: Each of the mounting parts comprises a mounting plate and two limiting blocks, wherein the two limiting blocks are symmetrically arranged on the mounting plate at intervals, and the interval between the two limiting blocks is constructed as a positioning groove matched with the profiling platform.

3. The automobile fuel tank ICV valve detection device according to claim 1, characterized in that: The device further comprises an adjusting mechanism for driving the two mounting parts to move.

4. The automobile fuel tank ICV valve detection device according to claim 3, characterized in that: The adjusting mechanism comprises a double-headed motor, two threaded rods and two sliding blocks, the double-headed motor is arranged at the lower end of the workbench, the two threaded rods are respectively fixed to the two output ends of the double-headed motor, a sliding hole cooperating with the sliding block is provided on the workbench, the two sliding blocks are threadedly connected with the two threaded rods in a one-to-one correspondence and are arranged in a one-to-one correspondence with the two mounting parts, each of the sliding blocks passes through the corresponding sliding hole and is fixed to the lower end of the corresponding mounting part, and under the action of the double-headed motor, the two sliding blocks can drive the two mounting parts to move toward or away from each other.

5. The automobile fuel tank ICV valve detection device according to claim 1, characterized in that: The opening and sealing detection unit further includes a second sealing member for sealing the fuel vapor adsorption pipe.

6. The automobile fuel tank ICV valve detection device according to claim 5, characterized in that: The second sealing member is a sealing plug, and the second sealing member is fixed to the pressure sensor.

7. A detection method using the automobile fuel tank ICV valve detection device according to any one of claims 1 to 6, characterized in that: It includes Step a), placing the fuel tank on the positioning fixture, and fixing the refueling pipe with the clamping mechanism; Step b), docking the exhaust pipe to the nozzle of the fuel vapor adsorption pipe and fixing the two; Step c), inserting the camera and the vent pipe into the refueling pipe at the same time, and sealing the refueling pipe opening; Step d), using the camera to take a photo of the ICV valve cover plate, and comparing the photo with a photo of a qualified ICV valve cover plate, if there is no difference between the two, the valve cover plate is qualified, otherwise it is unqualified; Step e), after the valve cover plate is tested to be qualified, the vent pipe is ventilated into the fuel tank through the ICV valve, and the gas flow rate at the outlet of the fuel vapor adsorption pipe is monitored. If the gas flow rate meets the set value, the ICV valve opening performance is qualified, otherwise it is unqualified; Step f), after detecting that the opening performance of the ICV valve is qualified, remove the exhaust pipe, then insert the pressure sensor into the fuel vapor adsorption tube and seal the pipe opening of the fuel vapor adsorption tube, and then continue to allow the ventilation pipe to ventilate the fuel tank through the ICV valve. When the internal pressure of the fuel tank rises to a set value, stop charging. At this time, the valve cover is closed under the action of the ICV valve spring force, and then open the refueling pipe to allow the camera and the ventilation pipe to withdraw from the refueling pipe at the same time. After the fuel tank is pressurized for a certain period of time, the pressure sensor detects the internal pressure of the fuel tank. If the internal pressure of the fuel tank is within the set range, the sealing performance of the ICV valve is qualified, otherwise it is unqualified.

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