An EGR valve shift testing device

Abstract

The utility model provides a kind of EGR valve displacement testing device, belong to engine detection technical field.The device includes bottom plate, fixed plate and clamping mechanism, fixed plate is arranged in parallel interval above bottom plate, fixed hole is opened in fixed plate, clamping mechanism is set on fixed plate, clamping mechanism includes two oppositely arranged variable clamping components, two variable clamping components are respectively arranged in the opposite sides of fixed hole, variable clamping component includes first cylinder, first push plate, shell and needle touch rod, opening is provided on shell towards fixed hole, needle touch rod is side by side with multiple along opening direction, needle touch rod and first push plate are slidably arranged in shell along opening direction, first cylinder is set on the side away from opening of shell, the output end of first cylinder passes through shell and is connected with first push plate.The utility model embodiment provides a kind of EGR valve displacement testing device, can solve the problem of lower accuracy of test result in prior art.

Description

Technical Field

[0001] This utility model relates to the field of engine testing technology, and in particular to an EGR valve displacement testing device. Background Technology

[0002] With the significant advancements in technology and the substantial improvement in residents' quality of life, energy consumption has become a major challenge in this era of rapid development. Current solutions primarily focus on renewable and clean energy sources, as well as the efficient utilization of existing energy sources. Meanwhile, automobiles have become an essential mode of transportation for almost every household. Given this large population base, solutions for efficient fuel energy utilization have become crucial, leading to the widespread application of EGR valves. EGR valves are electromechanical products used to control the amount of exhaust gas recirculated back to the intake system. The quality of the EGR valve directly impacts the efficiency of automotive energy use; therefore, how to test EGR valves has become a significant new challenge.

[0003] In existing technologies, when performing displacement tests on EGR valves, the EGR valve is usually vertically mounted on a clamping fixture, which clamps and fixes the EGR valve from the side. The clamping fixture usually uses a simple cylinder pressure plate for fixation. However, EGR valves are usually irregular cylindrical structures, and it is difficult to effectively fix the EGR valve with a simple pressure plate. Even slight shaking during the test can have a significant impact on the test structure.

[0004] Existing EGR valve displacement testing devices typically use a cylinder pressure plate, which may cause shaking when the EGR valve is fixed, resulting in low accuracy of the test results. Utility Model Content

[0005] This utility model provides an EGR valve displacement testing device, which can solve the problem of low accuracy of test results in the prior art. The technical solution is as follows: An EGR valve displacement testing device includes: a base plate, a fixing plate, and a clamping mechanism. The fixing plates are arranged parallel to each other above the base plate. The fixing plates have fixing holes. The clamping mechanism is disposed on the fixing plates. The clamping mechanism includes two variable clamping components arranged opposite each other. The two variable clamping components are respectively disposed on opposite sides of the fixing holes. The variable clamping components include a first cylinder, a first push plate, a housing, and a needle rod. The housing has an opening facing the fixing hole. Multiple needle rods are arranged side by side along the opening direction. The needle rods and the first push plate are slidably disposed in the housing along the opening direction. The first cylinder is disposed on the side of the housing away from the opening. The output end of the first cylinder passes through the housing and is connected to the first push plate. A transmission medium is disposed between the first push plate and the needle rods.

[0006] Optionally, the transmission medium is hydraulic oil.

[0007] Optionally, the clamping mechanism further includes two oppositely arranged auxiliary clamping components, which are respectively disposed on opposite sides of the fixing hole. Each auxiliary clamping component includes a second cylinder and a second push plate. The output end of the second cylinder is disposed facing the fixing hole, and the second push plate is fixedly connected to the output end of the second cylinder.

[0008] Optionally, a limiting protrusion is provided at the bottom of the second push plate, and a guide groove is provided on the fixed plate along the direction of the output end of the second cylinder, and the limiting protrusion is slidably disposed in the guide groove.

[0009] Optionally, the fixing plate and the base plate are detachably connected.

[0010] Optionally, a locking mechanism is provided between the fixing plate and the base plate. The locking mechanism includes a fixing ring, a locking pin, a sliding pin, and a locking ball. The base plate has a mounting hole, and the fixing ring is fixedly installed in the mounting hole. A first locking groove is provided on the inner ring of the fixing ring. The locking pin is slidably installed in the fixing ring in the vertical direction. A second locking groove matching the first locking groove is provided on the side wall of the locking pin. A first cavity is provided inside the locking pin. The sliding pin is slidably installed in the first cavity in the vertical direction. A third locking groove matching the second locking groove is provided on the outer wall of the sliding pin. The locking ball is slidably installed in the first locking groove, the second locking groove, and the third locking groove.

[0011] Optionally, an operating block is protruding on the outer side wall of the sliding column, and an operating hole is provided on the side wall of the locking column, with the operating block slidably disposed in the operating hole.

[0012] Optionally, the sliding column has a second cavity inside, and a vertically arranged fixing column is fixedly installed at the top of the locking column. The fixing column passes through the top of the sliding column, and a fixing block is installed at the bottom of the fixing column. The fixing block is slidably installed in the second cavity in the vertical direction, and a spring is installed between the fixing block and the top of the sliding column. The spring is sleeved on the fixing column.

[0013] Optionally, a column is provided between the fixing plate and the base plate.

[0014] Optionally, multiple columns are provided, and the multiple columns are arranged in a rectangular array. A support plate is provided at the bottom of each column, and the support plate is disposed on the base plate.

[0015] The beneficial effects of the technical solution provided by this utility model embodiment include at least the following: This utility model provides an EGR valve displacement testing device. A base plate serves as a fixing plate, providing bottom support. A clamping mechanism is provided to clamp and fix the EGR valve. By incorporating a variable clamping assembly, the combined action of a first cylinder, a first push plate, a needle rod, and a transmission medium allows multiple needle rods to conform to the shape of the EGR valve surface and provide clamping force, thereby increasing the clamping area. This allows the EGR valve to be more stably fixed on the clamping mechanism. When performing displacement testing on the EGR valve, it ensures that the EGR valve does not shift, thus guaranteeing the accuracy of the test results. This effectively solves the problem of low test result accuracy in existing technologies. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the auxiliary clamping component structure provided in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the locking mechanism structure provided in an embodiment of the present utility model; Figure 4 This is provided by the embodiment of the present utility model. Figure 3 A magnified structural diagram at point A; Figure 5 This is a schematic diagram of the disassembly state of the locking mechanism provided in this embodiment of the utility model; Figure 6 This is a schematic diagram of the active state of the locking mechanism provided in this embodiment of the utility model; Figure 7 This is a schematic diagram of the locking state of the locking mechanism provided in this embodiment of the utility model; Figure 8 This is a schematic diagram of the test system structure provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the upper and lower computer control system structure provided in an embodiment of the present utility model; Figure 10 This is a schematic diagram of the working principle of the laser sensor provided in this embodiment of the utility model.

[0018] In the diagram: 1-Base plate; 11-Mounting hole; 2-Fixing plate; 21-Fixing hole; 22-Guide groove; 3-Clamping mechanism; 31-Variable clamping assembly; 311-First cylinder; 312-First push plate; 313-Outer shell; 314-Pin rod; 32-Auxiliary clamping assembly; 321-Second cylinder; 322-Second push plate; 323-Limiting protrusion; 4-Locking mechanism; 41-Fixing ring; 411-First locking groove; 42-Locking post; 421-Second locking groove; 422-First cavity; 423-Operating hole; 424-Fixing post; 425-Fixing block; 43-Sliding post; 431-Third locking groove; 432-Operating block; 433-Second cavity; 44-Locking ball; 5-Spring; 6-Column; 7-Support plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the auxiliary clamping component structure provided in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the locking mechanism structure provided in an embodiment of the present utility model; Figure 4 This is provided by the embodiment of the present utility model. Figure 3 A magnified structural diagram at point A; Figure 5 This is a schematic diagram of the disassembly state of the locking mechanism provided in this embodiment of the utility model; Figure 6 This is a schematic diagram of the active state of the locking mechanism provided in this embodiment of the utility model; Figure 7 This is a schematic diagram of the locking state of the locking mechanism provided in an embodiment of this utility model. Figures 1 to 7An EGR valve displacement testing device is shown, comprising: a base plate 1, a fixing plate 2, and a clamping mechanism 3. The fixing plate 2 is arranged parallel to each other above the base plate 1, and a fixing hole 21 is provided on the fixing plate 2. The clamping mechanism 3 is disposed on the fixing plate 2 and includes two variable clamping components 31 arranged opposite each other. The two variable clamping components 31 are respectively disposed on opposite sides of the fixing hole 21. The variable clamping component 31 includes a first cylinder 311, a first push plate 312, a housing 313, and a needle rod 314. The housing 313 is provided with an opening facing the fixing hole 21. Multiple needle rods 314 are arranged side by side along the opening direction. The needle rods 314 and the first push plate 312 are slidably disposed in the housing 313 along the opening direction. The first cylinder 311 is disposed on the side of the housing 313 away from the opening. The output end of the first cylinder 311 passes through the housing 313 and is connected to the first push plate 312. A transmission medium is provided between the first push plate 312 and the needle rod 314.

[0021] For example, in this embodiment of the present invention, before testing, the EGR valve is vertically placed into the fixing hole 21, and the first cylinder 311 is activated to drive the first push plate 312 to slide inside the housing 313. This pushes the transmission medium to drive the needle rod 314 toward the EGR valve. The transmission medium is completely sealed between the first push plate 312 and the needle rod 314. When the end of the needle rod 314 touches the surface of the EGR valve, multiple needle rods 314 will fit and fix according to the shape of the EGR valve surface. This enables the variable clamping assembly 31 to clamp and fix according to the shape of the EGR valve surface, so that the clamping mechanism 3 can clamp and fix the EGR valve more stably and prevent it from shaking during the test and affecting the test results. Compared to traditional technologies that use only a flat push plate to fix the EGR valve, where there are usually only a few contact points between the flat push plate and the EGR valve, making it difficult to stably clamp the EGR valve, the clamping mechanism 3 in this embodiment uses a variable clamping component 31, which allows the needle rod 314 to fit tightly against the surface of the EGR valve, thereby increasing the clamping force area and thus more stably clamping and fixing the EGR valve. When using this device for testing, the accuracy of the test results can be guaranteed.

[0022] This utility model provides an EGR valve displacement testing device. A base plate serves as a fixed plate 2 for bottom support, and a clamping mechanism 3 clamps and fixes the EGR valve. By incorporating a variable clamping assembly 31, the combined action of a first cylinder 311, a first push plate 312, needle rods 314, and a transmission medium allows multiple needle rods 314 to conform to the shape of the EGR valve surface and provide clamping force, thereby increasing the clamping area. This allows the EGR valve to be more stably fixed on the clamping mechanism 3, ensuring that the EGR valve does not shift during displacement testing, thus guaranteeing the accuracy of the test results. This effectively solves the problem of low test result accuracy in existing technologies.

[0023] Optionally, the transmission medium is hydraulic oil.

[0024] For example, in this embodiment of the invention, hydraulic oil is used as the transmission medium. Its core advantages lie in its lubrication, sealing, heat dissipation, protection of metal parts, maintenance of viscosity stability, and near-incompressibility under high pressure. These characteristics work together to enable the variable clamping assembly 31 to achieve more precise control over the needle rod 314, allowing the needle rod 314 to more smoothly conform to the EGR valve surface, thereby increasing the lifespan of the device and improving its reliability.

[0025] Optionally, the clamping mechanism 3 further includes two oppositely arranged auxiliary clamping components 32, which are respectively arranged on opposite sides of the fixing hole 21. Each auxiliary clamping component 32 includes a second cylinder 321 and a second push plate 322. The output end of the second cylinder 321 is arranged facing the fixing hole 21, and the second push plate 322 is fixedly connected to the output end of the second cylinder 321.

[0026] Exemplary, in embodiments of this utility model, such as Figure 1 As shown, auxiliary clamping components 32 are provided on opposite sides of the fixing hole 21. The auxiliary clamping components 32 and the variable clamping components 31 are spaced 90° apart circumferentially along the fixing hole 21, so that the two auxiliary clamping components 32 can clamp and fix the EGR valve from another direction. By providing the auxiliary clamping components 32, the variable clamping components 31 can be assisted in clamping and fixing the EGR valve, thereby further improving the stability of the device.

[0027] Optionally, a limiting protrusion 323 is provided at the bottom of the second push plate 322, and a guide groove 22 is provided on the fixed plate 2 along the output end of the second cylinder 321. The limiting protrusion 323 is slidably disposed in the guide groove 22.

[0028] Exemplary, in embodiments of this utility model, such as Figure 1 and Figure 2As shown, by setting the limiting protrusion 323 and the guide groove 22 to cooperate, the guide groove 22 provides guidance for the movement direction of the second push plate 322, thereby enabling the auxiliary clamping assembly 32 to clamp and fix the EGR valve more stably, thus further improving the stability of the device.

[0029] Optionally, the fixing plate 2 and the base plate 1 can be detachably connected.

[0030] For example, in this embodiment of the present invention, by detachably connecting the fixing plate 2 and the base plate 1, the entire device can be easily disassembled and stored. On the other hand, multiple fixing plates 2 and clamping mechanisms 3 can be provided, and the fixing holes 21 on the multiple fixing plates 2 are of different sizes and shapes. Since the clamping mechanism 3 is fixed on the fixing plate 2, when testing EGR valves of different sizes or shapes, different fixing plates 2 carrying clamping mechanisms 3 can be selected to test the EGR valves. Even different clamping mechanism 3 forms can be set on multiple different fixing plates 2 to accommodate various EGR valves. By setting this structure, the device can adapt to testing EGR valves of different sizes or shapes, thereby improving the compatibility of the device.

[0031] Optionally, a locking mechanism 4 is provided between the fixing plate 2 and the base plate 1. The locking mechanism 4 includes a fixing ring 41, a locking pin 42, a sliding pin 43, and a locking ball 44. The base plate 1 has a mounting hole 11. The fixing ring 41 is fixedly installed in the mounting hole 11. The inner ring of the fixing ring 41 has a first locking groove 411. The locking pin 42 is slidably installed in the fixing ring 41 in the vertical direction. The side wall of the locking pin 42 has a second locking groove 421 that matches the first locking groove 411. The locking pin 42 has a first cavity 422 inside. The sliding pin 43 is slidably installed in the first cavity 422 in the vertical direction. The outer side wall of the sliding pin 43 has a third locking groove 431 that matches the second locking groove 421. The locking ball 44 is slidably installed in the first locking groove 411, the second locking groove 421, and the third locking groove 431.

[0032] Exemplary, in embodiments of this utility model, such as Figure 4As shown, the top of the locking post 42 is fixed to the bottom of the fixing plate 2. The first cavity 422 is arranged longitudinally. The first locking groove 411 is an arc-shaped locking groove bent from the inner sidewall of the fixing ring 41 to the outer sidewall. The second locking groove 421 is an arc-shaped locking groove bent vertically within the sidewall of the locking post 42. The third locking groove 431 is an arc-shaped locking groove bent inward from the outer sidewall of the sliding post 43. Multiple first locking grooves 411, second locking grooves 421, and third locking grooves 431 can be evenly spaced along the circumference of the locking post 42. In this embodiment, four first locking grooves 411, four second locking grooves 421, and four third locking grooves 431 are provided, and correspondingly, four locking balls 44 are also provided. The diameter of the locking ball 44 is larger than the diameter of the second locking groove 421. Therefore, during the movement of the locking post 42, the locking ball 44 remains within the locking post 42, preventing it from falling off. Figure 5 As shown, the locking pin 42 and the fixing ring 41 are detached at this time, and the fixing plate 2 and the base plate 1 are separated. The sliding pin 43 slides within the locking pin 42, adjusting its position so that the second locking groove 421 and the third locking groove 431 are aligned and connected. The locking ball 44 can then slide within the second locking groove 421 and the third locking groove 431. When the locking pin 42 is inserted into the fixing ring 41, the locking ball 44 is tightly pressed against the wall of the third locking groove 431 due to the restriction of the fixing ring 41. Figure 6 As shown, when the locking pin 42 moves to the point where the first locking groove 411, the second locking groove 421, and the third locking groove 431 are all engaged and connected, the first locking groove 411, the second locking groove 421, and the third locking groove 431 form a spherical cavity. At this time, the locking ball 44 can roll freely within the first locking groove 411, the second locking groove 421, and the third locking groove 431, as shown. Figure 7 As shown, the control slide 43 slides upward within the locking pin 42, causing the second locking groove 421 and the third locking groove 431 to misalign. At this time, the locking ball 44 is located in the first locking groove 411 and the second locking groove 421, and the locking ball 44 is in contact with the groove wall of the first locking groove 411. Due to the restriction of the locking ball 44, the locking pin 42 and the fixing ring 41 cannot be separated, thus completing the locking and fixing between the fixing plate 2 and the base plate 1. When it is necessary to release the lock between the fixing plate 2 and the base plate 1, slide the slide 43 downward, so that the first locking groove 411, the second locking groove 421 and the third locking groove 431 are all connected and aligned. Then, pull the locking pin 42 and the slide 43 upward together to separate the fixing plate 2 and the base plate 1. By setting this structure, the locking or separation between the fixing plate 2 and the base plate 1 can be quickly achieved, thereby improving the ease of operation of this device.

[0033] Optionally, an operating block 432 protrudes from the outer side wall of the sliding column 43, and an operating hole 423 is provided on the side wall of the locking column 42. The operating block 432 is slidably disposed in the operating hole 423.

[0034] Exemplary, in embodiments of this utility model, such as Figures 4 to 7 As shown, by setting the operating block 432, the sliding column 43 can be easily operated. By moving the operating block 432 up and down, the sliding column 43 can slide up and down within the locking column 42, thereby improving the ease of operation of this device. At the same time, by setting the operating hole 423, the sliding column 43 can also be limited, restricting the maximum stroke of the sliding column 43. When the operating block 432 is at the bottom of the operating hole 423, the first locking groove 411, the second locking groove 421, and the third locking groove 431 are all engaged and connected, thereby reducing the invalid stroke of the sliding column 43 and further improving the ease of operation of this device.

[0035] Optionally, the sliding column 43 has a second cavity 433 inside, and a vertically arranged fixing column 424 is fixedly installed at the top of the locking column 42. The fixing column 424 passes through the top of the sliding column 43, and a fixing block 425 is provided at the bottom of the fixing column 424. The fixing block 425 is slidably installed in the second cavity 433 in the vertical direction. A spring 5 is provided between the fixing block 425 and the top of the sliding column 43, and the spring 5 is sleeved on the fixing column 424.

[0036] Exemplary, in embodiments of this utility model, such as Figures 4 to 7 As shown, the second cavity 433 is arranged longitudinally, and the fixing block 425 limits the bottom of the spring 5. When installing the locking pin 42 and the fixing ring 41, the operating block 432 is pushed downwards. At this time, the spring 5 is compressed. After the locking pin 42 and the fixing ring 41 are engaged, when the first locking groove 411, the second locking groove 421 and the third locking groove 431 are all connected and aligned, the restriction on the operating block 432 is released. Under the action of the elastic force, the spring 5 drives the sliding pin 43 to slide upwards in the locking pin 42, thereby causing the third locking groove 431 to be misaligned, completing the locking between the fixing plate 2 and the base plate 1. By setting this structure, the spring 5 can achieve faster locking, further improving the ease of operation of this device.

[0037] Optionally, a column 6 is provided between the fixing plate 2 and the base plate 1.

[0038] Exemplary, in embodiments of this utility model, such as Figure 1 As shown, after the locking mechanism 4 is set between the fixed plate 2 and the base plate 1, the fixed plate 2 can be further supported by the column 6 set between the fixed plate 2 and the base plate 1 to prevent the fixed plate 2 from shaking during the test and affecting the test results. By setting this structure, the stability of the device is further improved.

[0039] Optionally, multiple columns 6 are provided, and the multiple columns 6 are arranged in a rectangular array. A support plate 7 is provided at the bottom of the column 6, and the support plate 7 is provided on the base plate 1.

[0040] Exemplary, in embodiments of this utility model, such as Figure 1 As shown, by setting multiple columns 6, a more stable supporting force is provided for the fixing plate 2. By setting a support plate 7, the multiple columns 6 are in contact with the base plate 1 through the support plate 7, changing from point contact to surface contact, which increases the force-bearing area of ​​the supporting force, thereby making the fixing plate 2 more stably fixed on the base plate 1, and further improving the stability of the device.

[0041] Exemplarily, in this embodiment of the present invention, the host computer part includes: a graphical user interface (UI), a test process control module, a data processing module, a data display module, and a communication module. The slave computer part includes: a main process control module, a serial communication module, an analog signal processing module, a digital signal processing module, a SENT communication module, a power supply module, a solenoid valve drive module, a key input module, and a sensor signal acquisition module. The EGR valve is clamped and fixed at clamping mechanism 3, and is started by the slave computer to perform performance testing. A displacement sensor is installed at the bottom of the valve seat in the upper airflow duct to measure the distance the valve stem of the EGR valve moves. The displacement data is collected by the slave computer and uploaded to the host computer for processing and storage in the database. An audible and visual alarm is installed on the top of the device to display the system test status and fault alarms. The test system is also equipped with a start button and an emergency stop switch for system circuit control. The host computer is mainly used to communicate with the slave computer, issue test commands to control the system's testing, receive sensor data from the slave computer, process the data, and display the test results graphically for easy worker judgment. The data is also saved to a database. The host computer and slave computer communicate via an RS485 communication module. Power supply modules include 12V, 5V, and 3.3V modules, supplying power to the EGR valve, audible and visual alarm, and the slave control system, respectively. The main process control module uses the STM32F103ZET6 as the main control chip. This microcontroller has high-performance processing capabilities, operating at a frequency of up to 72 MHz, excellent computing performance, and real-time response capabilities. It also has abundant peripheral resources. In this system, this module is used to receive commands from the host computer, collect sensor signals, and transmit the collected data to the host computer for processing. The main process control module uses the STM32F103ZET6 as the main control chip. This microcontroller has high-performance processing capabilities, operating at a frequency of up to 72 MHz, excellent computing performance, and real-time response capabilities. It also has abundant peripheral resources. In this system, this module receives instructions from the host computer, acquires signals from the sensors, and transmits the acquired data to the host computer for processing. The displacement sensor measures the displacement of the EGR valve. The sensor is located on the positioning plate, and consideration must be given not only to the center distance of the laser emitted by the laser sensor but also to the lateral distance between the laser and the displacement sensor. The ADC analog signal sampling module acquires the signals output by the sensors and then transmits them to the host computer for processing. The SENT communication module receives displacement data from the sensors via a circuit. Because the EGR valve has both open-loop and closed-loop control modes (open-loop control has no feedback signal, while closed-loop control does), a communication module is needed to read the feedback signal. The solenoid valve drive module is the drive circuit, and the main process control module drives the solenoid valve to start and stop.The button input module is a circuit designed to work with the start button on the mechanical test bench. After the host computer initiates the test, both buttons must be pressed simultaneously to start the test, preventing accidental presses or other abnormalities. The communication module includes a RS-485 communication module, a serial communication module, a bidirectional PWM communication module, and a SENT communication module. These are used for communication with the main controller module and the host computer, meeting various communication requirements.

[0042] In this embodiment, a non-contact laser displacement sensor can be used, avoiding the accuracy degradation problem caused by wear in contact sensors, and enabling long-term stable and high-precision displacement measurement. The measurement accuracy can reach 0.01mm, far exceeding that of traditional contact sensors. Precise control of the LATM motor ensures high-precision control and guarantees the accuracy of the EGR valve opening degree during each measurement, reducing repeatability errors caused by human operation or mechanical errors. The multi-point continuous automatic measurement function allows the system to capture the dynamic response characteristics of the EGR valve at different opening degrees. By analyzing the displacement change curve of the valve during rapid opening and closing, the dynamic performance of the EGR valve can be comprehensively evaluated.

[0043] The testing process for the EGR valve is as follows: The EGR valve to be tested is placed on the clamping mechanism 3. The operator uses the host computer to transmit the test command to the slave computer. After receiving the command, the STM32 chip waits for the input button to input the command. The STM32 chip in the slave computer outputs control commands to control the solenoid valves. The solenoid valves open, driving the first cylinder 311 and the second cylinder 321 to press vertically on the upper end of the EGR valve to be tested, fixing it in place. The STM32 microcontroller in the slave computer outputs a PWM signal to drive the EGR valve actuator (LATM motor) to generate valve displacement. Simultaneously, a non-contact laser displacement sensor collects the valve opening data in real time. The system detects changes in temperature and inputs displacement signals to the main control system via a SENT or ADC module. Real-time sensor data is transmitted to the host computer via serial communication. The host computer software analyzes, filters, and processes the data, generating key performance graphs such as the valve's displacement-time curve and repeatability comparison curve. The system has automatic judgment functions; in case of test anomalies (response delay, unique deviation, etc.) or equipment failure, it will trigger an audible and visual alarm system and display fault information. The host computer displays the test results and generates corresponding reports. Test data is synchronously saved to the database, supporting statistical analysis or batch comparison. After the test, the system automatically controls the solenoid valve to reset the clamp and release the EGR valve. The operator can then replace the test pieces for batch testing.

[0044] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0045] The above description is only an optional embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An EGR valve displacement testing device, characterized in that, include: The base plate (1), the fixing plate (2), and the clamping mechanism (3) are all included. The fixing plates (2) are arranged parallel to each other above the base plate (1). The fixing plates (2) have fixing holes (21). The clamping mechanism (3) is set on the fixing plates (2). The clamping mechanism (3) includes two oppositely arranged variable clamping components (31). The two variable clamping components (31) are respectively set on opposite sides of the fixing holes (21). The variable clamping components (31) include a first cylinder (311), a first push plate (312), a housing (313), and a needle rod (314). The housing (313) is provided with There is an opening facing the fixing hole (21), and multiple needle rods (314) are arranged side by side along the opening direction. The needle rods (314) and the first push plate (312) are slidably arranged in the housing (313) along the opening direction. The first cylinder (311) is arranged on the side of the housing (313) away from the opening. The output end of the first cylinder (311) passes through the housing (313) and is connected to the first push plate (312). A transmission medium is provided between the first push plate (312) and the needle rods (314).

2. The EGR valve displacement testing device according to claim 1, characterized in that, The transmission medium is hydraulic oil.

3. The EGR valve displacement testing device according to claim 1, characterized in that, The clamping mechanism (3) further includes two auxiliary clamping components (32) arranged opposite to each other. The two auxiliary clamping components (32) are respectively arranged on opposite sides of the fixing hole (21). The auxiliary clamping components (32) include a second cylinder (321) and a second push plate (322). The output end of the second cylinder (321) is arranged facing the fixing hole (21), and the second push plate (322) is fixedly connected to the output end of the second cylinder (321).

4. The EGR valve displacement testing device according to claim 3, characterized in that, The bottom of the second push plate (322) is provided with a limiting protrusion (323), and the fixed plate (2) is provided with a guide groove (22) along the output end of the second cylinder (321). The limiting protrusion (323) is slidably disposed in the guide groove (22).

5. The EGR valve displacement testing device according to claim 1, characterized in that, The fixing plate (2) and the base plate (1) are detachably connected.

6. The EGR valve displacement testing device according to claim 5, characterized in that, A locking mechanism (4) is provided between the fixing plate (2) and the base plate (1). The locking mechanism (4) includes a fixing ring (41), a locking pin (42), a sliding pin (43), and a locking ball (44). The base plate (1) has a mounting hole (11). The fixing ring (41) is fixedly installed in the mounting hole (11). The inner ring of the fixing ring (41) has a first locking groove (411). The locking pin (42) is slidably installed in the fixing ring (41) in the vertical direction. The side wall of the locking pin (42) has a locking groove (411). There is a second locking groove (421) that matches the first locking groove (411). The locking post (42) has a first cavity (422) inside. The sliding post (43) is slidably disposed in the first cavity (422) in the vertical direction. The outer wall of the sliding post (43) has a third locking groove (431) that matches the second locking groove (421). The locking ball (44) is slidably disposed in the first locking groove (411), the second locking groove (421) and the third locking groove (431).

7. The EGR valve displacement testing device according to claim 6, characterized in that, An operating block (432) is protruding on the outer side wall of the sliding column (43), and an operating hole (423) is provided on the side wall of the locking column (42). The operating block (432) is slidably disposed in the operating hole (423).

8. The EGR valve displacement testing device according to claim 7, characterized in that, The sliding column (43) has a second cavity (433) inside. A vertically arranged fixing column (424) is fixedly installed at the top of the locking column (42). The fixing column (424) passes through the top of the sliding column (43). A fixing block (425) is installed at the bottom of the fixing column (424). The fixing block (425) is slidably installed in the second cavity (433) in the vertical direction. A spring (5) is installed between the fixing block (425) and the top of the sliding column (43). The spring (5) is sleeved on the fixing column (424).

9. The EGR valve displacement testing device according to claim 6, characterized in that, A column (6) is provided between the fixing plate (2) and the base plate (1).

10. The EGR valve displacement testing device according to claim 9, characterized in that, Multiple columns (6) are provided, and the multiple columns (6) are arranged in a rectangular array. A support plate (7) is provided at the bottom of each column (6), and the support plate (7) is provided on the base plate (1).

Images