Three-way valve response performance detection system

Abstract

The utility model discloses a three-way valve response performance detection system. The detection system comprises a coil sleeved on the three-way valve, a current detection module, a voltage detection module, a signal acquisition module and a programmable power supply, the programmable power supply and the coil form a closed loop, and the current detection module is connected in the closed loop. The two ends of the voltage detection module are connected to the two ends of the coil respectively, and the signal acquisition module is used for receiving sampling signals output by the current detection module and the voltage detection module. According to the utility model, the response performance detection precision can be improved, and the safety of the brake-by-wire system can be ensured.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of three-way valve detection, and in particular to a three-way valve response performance detection system. Background Art

[0002] Vehicle braking systems are evolving towards a controlled-by-wire system, currently primarily an electro-mechanical hydraulic system. A controlled-by-wire system primarily consists of a master cylinder, electric cylinder, motor, solenoid valve, motor position sensor, pedal displacement sensor, pressure sensor, and an ECU (Electronic Control Unit). When the driver depresses the brake pedal, the brake-by-wire ECU detects the change in the pedal displacement sensor connected to the pedal. Based on this change, it determines the required braking pressure from the electric cylinder and activates the motor. The motor then drives the electric cylinder to compress the brake fluid, building up hydraulic pressure that is then transmitted to the wheel cylinders, providing braking force for the vehicle.

[0003] In response performance testing, under normal circumstances, only the coil current and voltage performance of the solenoid valve under no-pressure conditions are measured. Due to its 0.1 millisecond-level characteristics, it is difficult for general sampling systems to meet the usage requirements. For this reason, an oscilloscope is generally used to collect current and voltage signals. However, in the braking system of an actual vehicle, there is often a pressure difference between the inlet and outlet of the solenoid valve when it is working. Therefore, it is necessary to place the pressure curve and the current and voltage curves in the same time coordinate system to obtain the power-on response time and power-off response time. If the test bench uses an oscilloscope to collect the current and voltage of the solenoid valve coil, on the one hand, the current and voltage signals collected by the oscilloscope and the pressure sensor signals collected by the test equipment belong to two sets of collection systems. After these curves are processed and placed together, errors will be introduced; on the other hand, the expensive oscilloscope makes the equipment cost high. Therefore, it is necessary to design a test device to collect the response test requirements of the solenoid valve. Utility Model Content

[0004] The embodiment of the present utility model provides a three-way valve response performance detection system, which detects the response performance of the three-way valve, improves the detection accuracy, and ensures safety and reliability when applied to a wire control brake system.

[0005] The three-way valve response performance detection system provided by an embodiment of the present utility model includes a coil, a current detection module, a voltage detection module, a signal acquisition module and a programmable power supply, which are sleeved on the three-way valve. The programmable power supply and the coil form a closed loop, the current detection module is connected to the closed loop, the two ends of the voltage detection module are respectively connected to the two ends of the coil, and the signal acquisition module is used to receive the sampling signals output by the current detection module and the voltage detection module.

[0006] As an optional implementation, in an embodiment of the present utility model, the three-way valve response performance detection system also includes a test board, an electronic switch and an industrial computer, the first output end and the second output end of the industrial computer are electrically connected to the control end of the programmable power supply and the input end of the test board, respectively, the output end of the test board is electrically connected to the control end of the electronic switch, the input end and the output end of the electronic switch are connected to the closed loop, and the input end of the industrial computer is electrically connected to the output end of the signal acquisition module.

[0007] As an optional implementation, in an embodiment of the present utility model, the electronic switch is an NMOS tube, one end of the coil is connected to the output end of the programmable power supply through a current detection module, the other end of the coil is connected to the drain of the NMOS tube, the source of the NMOS tube is grounded, and the gate of the NMOS tube is connected to the output end of the test board.

[0008] As an optional implementation, in an embodiment of the present utility model, the signal acquisition module includes a signal conditioning circuit, which is a filtering circuit and / or an amplification circuit. The two input ends of the signal conditioning circuit are respectively connected to the output end of the current detection module and the output end of the voltage detection module, and the output end of the signal conditioning circuit is connected to the input end of the industrial computer.

[0009] As an optional implementation, in an embodiment of the present utility model, the current detection module is a current transformer, and the voltage detection module is a voltage transformer.

[0010] Compared with the prior art, the beneficial effects of the embodiments of the present invention are:

[0011] The embodiment of the utility model obtains the power-on or power-off response time of the three-way valve by controlling whether the coil is energized and the data of the current detection module and the voltage detection module, thereby detecting the response performance of the three-way valve, improving the detection accuracy, and ensuring safety when used in a wire control brake system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of a three-way valve response test system provided by an embodiment of the utility model;

[0013] Figure 2 This is a schematic structural diagram of a three-way valve provided by an embodiment of the present utility model;

[0014] Figure 3 This is a flow chart of a power-on / off response test method provided by an embodiment of the present utility model;

[0015] Figure 4It is a principle diagram of the power on / off response testing method provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the present invention clearer, the specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings. It should be noted that, under the premise of no conflict, the various embodiments described below or the various technical features can be arbitrarily combined to form a new embodiment. Except where otherwise specified, the materials and equipment used in this embodiment can be purchased from the market. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar numbers throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and cannot be understood as limiting this application.

[0017] In the description of this application, it should be understood that the terms "upper," "lower," "front," "back," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0018] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "connected," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, a connection through an intermediary medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0019] The terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. In addition, the terms "including," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to the process, method, product, or apparatus.

[0020] Example 1

[0021] See also Figure 1 , Figure 1This is a schematic diagram of a three-way valve response performance detection system disclosed in one embodiment of the present utility model. Figure 1 As shown, the three-way valve response performance detection system mainly includes a coil 31 mounted on the three-way valve, a current detection module 32, a voltage detection module 33, a signal acquisition module 20, and a programmable power supply 40. The programmable power supply and the coil form a closed loop. The current detection module is connected to the closed loop, and the two ends of the voltage detection module are respectively connected to the two ends of the coil. The signal acquisition module is used to receive the sampling signals output by the current detection module and the voltage detection module. By turning the coil on and off, the three-way valve's power-on or power-off response performance can be tested.

[0022] The above-mentioned current detection module and voltage detection module can be implemented using an ammeter and a voltmeter, respectively. Of course, in other embodiments, they can also be implemented using current transformers and voltage transformers, etc. The current and voltage signals collected by the current detection module and the voltage detection module are sent to the signal acquisition module. The signal acquisition module performs corresponding processing, such as filtering and amplification, and then sends it to the host computer (such as the industrial computer 10).

[0023] The three-way valve 50 can be realized by using conventional existing technology, and a coil is sleeved on the three-way valve. Figure 2 A three-way valve is shown, please refer to Figure 2 As shown, the three-way valve 50 may include a valve block 527, which includes a valve chamber 531 and a first valve oil port 517, a second valve oil port 519, and a third valve oil port 523 connected to the valve chamber 531. A valve body 515, a support seat 529, a valve seat 525, and a movable valve core 520 are disposed within the valve chamber 531. The upper end of the support seat 529 is fixedly connected to the lower end of the valve body 515. The valve seat 525 is fixedly connected to the lower end of the support seat 529. The valve core 520 is disposed within the support seat 529 and is positioned between the valve body 515 and the valve seat 525, allowing for vertical movement. A first communication port 530 is defined through the valve body 515, connecting the first valve oil port 517 with the interior of the support seat 529. A second communication port 521 is defined through the support seat 529, connecting the second valve oil port 519 with the interior of the support seat 529. The valve seat 525 is penetrated by a third communication port 524 that communicates with the third valve oil port 523 and the interior of the support seat 529 .

[0024] Specifically, the three-way valve is a solenoid valve. When energized, the valve core 520 is driven downward, sealing the third communication port 524 while simultaneously opening the first communication port 530, thereby enabling communication between the first valve oil port 517 and the second valve oil port 519 through the first communication port 530 and the second communication port 521. It is worth noting that a gap (not numbered in the figure) exists between the outer wall of the valve core 520 and the inner wall of the support seat 529, allowing oil to flow through this gap between the first communication port 530 and the second communication port 521.

[0025] In the power-off state, the valve core 520 is driven upward. When the valve core 520 moves upward, it seals the first connecting port 530 and opens the third connecting port 524 at the same time, so that the third valve oil port 523 and the second valve oil port 519 are connected through the third connecting port 524 and the second connecting port 521.

[0026] To drive the valve core 520 upward, an elastic member 526 is further disposed within the support seat 529. In this embodiment, one end of the elastic member 526 abuts against the valve core 520, while the other end abuts against the support seat 529. In other embodiments, one end of the elastic member 526 may abut against the valve core 520, while the other end abuts against the valve seat 525. The elastic member 526 provides a spring force to propel the valve core 520 upward. Specifically, the elastic member 526 may be a spring mounted on the valve core 520, but is not limited thereto.

[0027] The support seat 529 is hollow, annular, and funnel-shaped, wide at the top and narrow at the bottom. A cavity is formed within the support seat 529, which houses the valve core 520. A second communication port 521 extends through the sidewall of the support seat 529. Specifically, the inner diameter of the upper end of the support seat 529 is larger than the inner diameter of the middle portion of the support seat 529, forming a first step between the upper end and the middle portion of the support seat 529.

[0028] The inner diameter of the middle portion of the support seat 529 is larger than the inner diameter of the lower end of the support seat 529, and a second step portion is formed between the middle portion of the support seat 529 and the lower end of the support seat 529. The second communication port 521 is provided through the side wall of the middle portion of the support seat 529. The second communication port 521 is located above the second step portion.

[0029] The upper end of the valve core 520 is larger than the lower end of the valve core 520. A third step is formed between the upper and lower ends of the valve core 520. The elastic member 526 is sleeved around the lower end of the valve core 520. In this embodiment, the elastic member 526 is sandwiched between the second and third steps. That is, one end of the elastic member 526 abuts the second step, and the other end of the elastic member 526 abuts the third step.

[0030] A first sealing ring 518 and a second sealing ring 522 are provided within the valve chamber 531, outside the support seat 529. The first sealing ring 518 is located below the first step and sandwiched between the inner wall of the valve chamber 531 and the outer wall of the support seat 529. The second sealing ring 522 is located below the second step and sandwiched between the inner wall of the valve chamber 531 and the outer wall of the support seat 529. The first sealing ring 518 prevents oil from leaking from the outside of the support seat 529 and allows it to communicate only through the first and second communication ports 530, 521, and the interior of the support seat 529. The second sealing ring 522 prevents oil from leaking from the outside of the support seat 529 and allows it to communicate only through the second and third communication ports 521, 524, and the interior of the support seat 529.

[0031] The valve seat 525 is housed within the support seat 529. The valve seat 525 has an inverted cylindrical shape and includes an annular sidewall (not labeled) and a top plate (not labeled) located at the top of the sidewall. The third communication port 524 is disposed through the center of the top plate of the valve seat 525. Specifically, the third communication port 524 and the third valve oil port 523 are vertically aligned. The first valve oil port 517 and the second valve oil port 519 are arranged horizontally, while the third valve oil port 523 is arranged vertically and is located directly below the third communication port 524.

[0032] The support seat 529 and the valve body 515 are two different components. The upper end of the support seat 529 is fixedly connected to the lower end of the valve body 515. Specifically, the outer wall of the lower end of the valve body 515 and the inner wall of the upper end of the support seat 529 are fixed by laser welding.

[0033] The valve seat 525 and the support seat 529 are two different components. The valve seat 525 is fixedly connected to the lower end of the support seat 529. Specifically, the valve seat 525 and the lower end of the support seat 529 are interference fit, that is, the outer wall of the valve seat 525 and the inner wall of the lower end of the support seat 529 are interference fit.

[0034] In addition, a flange surface is provided on the bottom of the valve seat 525 protruding outward, and the flange surface abuts against the bottom of the support seat 529 to prevent the valve seat 525 from being displaced relative to the support seat 529 due to the hydraulic pressure.

[0035] Specifically, the first communication port 530 includes a radial communication hole defined along the radial direction of the valve body 515 and an axial communication hole defined along the axial direction of the valve body 515. The radial communication hole communicates with the first valve oil port 517, and the axial communication hole communicates with the cavity within the support seat 529. The radial communication hole and the axial communication hole communicate with each other. In this embodiment, the radial communication hole is positioned above or equal to the top of the support seat 529, allowing the radial communication hole to be exposed and not obstructed by the support seat 529. The radial communication hole corresponds to the first valve oil port 517, allowing the first valve oil port 517 to communicate with the cavity within the support seat 529 through the radial and axial communication holes.

[0036] Furthermore, an upper ring filter 516 and a lower ring filter 528 are provided in the valve chamber 531. The upper ring filter 516 is provided between the first valve oil port 517 and the first communication port 530, and the lower ring filter 528 is provided between the second valve oil port 519 and the second communication port 521. The filters provided in the valve chamber 531 can filter impurities in the oil and prevent them from entering the valve chamber 531.

[0037] The upper ring filter 516 and the lower ring filter 528 are both in a circular shape, with filter cloth (not numbered in the figure) inside.

[0038] Furthermore, a valve stem 514 is axially passed through the center of the valve body 515 . The valve stem 514 is movably disposed in the valve body 515 . The lower end of the valve stem 514 is fixedly connected to the valve core 520 or the two are in contact with each other.

[0039] The three-way valve also includes a movable iron 512. The coil 31 is sleeved on the outside of the movable iron 512. The movable iron 512 is located above the valve body 515. After the valve stem 514 passes through the valve body 515, the upper end of the valve stem 514 protrudes above the valve body 515. The movable iron 512 is fixedly connected to the upper end of the valve stem 514. Specifically, the upper end of the valve stem 514 and the movable iron 512 are interference-fitted. When the coil 31 is energized, the movable iron 512 is driven downward, which in turn drives the valve core 520 downward through the valve stem 514 and compresses the elastic member 526. When the coil 31 is de-energized, the elastic member 526 pushes the valve core 520 upward through its elastic force and drives the movable iron 512 upward through the valve stem 514.

[0040] The three-way valve further includes a magnetic isolation tube 511. The upper end of the magnetic isolation tube 511 can be sealed, and the lower end is open. The interior of the magnetic isolation tube 511 is a hollow cavity. The valve body 515 and the movable iron 512 are housed within the magnetic isolation tube 511 through the opening at the lower end of the magnetic isolation tube 511. The coil 31 is disposed outside the magnetic isolation tube 511. The valve body 515 is fixedly connected to the magnetic isolation tube 511. Specifically, the outer wall of the valve body 515 and the inner wall of the magnetic isolation tube 511 are fixed by laser welding. The movable iron 512 can move up and down within the magnetic isolation tube 511.

[0041] When the coil 31 is energized, the valve body 515 and the movable iron 512 are magnetized to generate an attractive force. Since the valve body 515 and the magnetic isolation tube 511 are connected by laser welding and cannot move, the movable iron 512 moves downward toward the valve body 515 due to the electromagnetic force, driving the valve stem 514 and the valve core 520 to move downward, and overcome the spring force to compress the spring. Finally, the bottom of the valve core 520 is tightly attached to the top plate of the valve seat 525 to seal the third communication port 524. Figure 2 As shown, at this time, the first valve oil port 517 and the second valve oil port 519 are communicated with each other through the first communication port 530 and the second communication port 521 .

[0042] When the coil 31 is de-energized, the spring pushes the valve core 520, the valve stem 514 and the moving iron 512 upwards through elastic force, and finally the top of the valve core 520 is tightly attached to the bottom wall of the valve body 515 to seal the axial connecting hole of the first connecting port 530. At this time, the third valve oil port 523 and the second valve oil port 519 are connected through the third connecting port 524 and the second connecting port 521.

[0043] The three-way valve provided by the embodiment of the present utility model has a valve cavity 531 and a first valve oil port 517, a second valve oil port 519, and a third valve oil port 523 connected to the valve cavity 531 within the valve block 527. A valve body 515, a support seat 529, a valve seat 525, and a movable valve core 520 are disposed within the valve cavity 531. A first communication port 530 is provided through the valve body 515, connecting the first valve oil port 517 with the interior of the support seat 529. A second communication port 521 is provided through the support seat 529, connecting the second valve oil port 519 with the interior of the support seat 529. A third communication port 524 is provided through the valve seat 525, connecting the third valve oil port 523 with the interior of the support seat 529. The three-way valve can connect the first valve oil port 517 with the second valve oil port 519, or connect the third valve oil port 523 with the second valve oil port 519, by moving the valve core 520 up and down. The overall structure of the three-way valve is relatively simple. The support seat 529 and the valve seat 525 are both formed by a molding process, and have a simple structure and low cost.

[0044] In this embodiment, the valve block 527 can be made of aluminum, the valve body 515 and the moving iron 512 can be made of low-carbon steel, the support seat 529, the valve seat 525, and the magnetic isolation tube 511 can be made of free-cutting stainless steel, the valve core 520 can be made of plastic, and the valve stem 514 can be made of low-carbon steel or free-cutting stainless steel.

[0045] The on / off control of the coil can be performed by controlling one of the programmable power supply or the closed loop. For example, the on / off control of the coil can be achieved by directly controlling the operation of the programmable power supply through the industrial computer. Of course, the coil control circuit can also achieve on / off control of the coil by controlling the closed loop. For example, the coil control circuit can include a test board (such as an FPGA card 50 or a PLC board or a CPLD board) and an electronic switch, wherein the industrial computer is connected to the control end of the electronic switch through the test board, and the input and output ends of the electronic switch are connected to the closed loop. The industrial computer sends a control signal to the test board, and the test board outputs the control signal to control the power supply of the electronic switch to achieve control of the closed loop.

[0046] There are many ways to implement an electronic switch, for example, it can be implemented using any of a triode, MOS tube, thyristor, and relay. For example, when an NMOS tube 34 is used, one of the two exposed terminals on the coil is connected to the power output terminal of the programmable power supply through the current detection module, and the other exposed terminal on the coil is connected to the drain of the NMOS tube. The source of the NMOS tube is grounded, and its gate is connected to the output terminal of the test board. When the coil needs to be energized, the test board outputs a high level, the NMOS tube is turned on, a closed loop is formed, and the programmable power supply supplies power to the coil. When the coil needs to be de-energized, the test board outputs a low level, the NMOS tube is turned off, the closed loop is broken, and the coil is not energized.

[0047] To obtain the power-on or power-off response time of the three-way valve by controlling whether the coil is energized, please refer to Figure 3 As shown, it may include the following steps:

[0048] S210 . In response to the first power-on of the coil, obtain a first voltage signal collected by a voltage detection module and / or a first current signal collected by a current detection module.

[0049] S220 , in response to the power-off operation of the coil, determining the inflection point moment of the first voltage signal or the first current signal, recorded as the first inflection point moment, and the moment when the outlet pressure of the three-way valve begins to rise.

[0050] The first inflection point can be considered as the power-off time t2. After a certain period of power outage, the outlet pressure of the three-way valve begins to rise. The moment when the outlet pressure of the three-way valve begins to rise ( Figure 4 The power failure response time (T1) can be determined as follows: T1 = t3 - t2.

[0051] S230. In response to the second energization of the coil, obtain a second voltage signal collected by the voltage detection module and a second current signal collected by the current detection module, determine the inflection point time of the second voltage signal or the second current signal, record it as the second inflection point moment, and the moment when the second current signal has a peak and valley.

[0052] The first inflection point can be considered as the second power-on time t4. After a certain period of time, the coil current will gradually increase. After increasing to a certain value, it will gradually decrease, and then gradually increase again until it stabilizes to a certain value. Therefore, starting from the second power-on time t4, the coil current will have a peak and a trough, and then reach the stable time t6 ( Figure 4 The peak-valley moment here refers to the moment t5 at which a trough is obtained after a peak appears, so that the power-on response time (T2) can be determined: T2=t5-t4.

[0053] The responsiveness of a three-way valve can be determined based on the power-on response time and the power-off response time. If the power-off response time is greater than a first preset time, and / or the power-on response time is greater than a second preset time, the three-way valve fails the response test. Specifically, the three-way valve meets the responsiveness test only if both the power-off response time is less than or equal to the first preset time and the power-on response time is less than or equal to the second preset time.

[0054] The above is a detailed introduction to a three-way valve response performance detection system disclosed in the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for general technical personnel in this field, based on the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A three-way valve response performance detection system, characterized in that: It includes a coil sleeved on the three-way valve, a current detection module, a voltage detection module, a signal acquisition module and a programmable power supply. The programmable power supply and the coil form a closed loop. The current detection module is connected to the closed loop. The two ends of the voltage detection module are respectively connected to the two ends of the coil. The signal acquisition module is used to receive the sampling signals output by the current detection module and the voltage detection module.

2. The three-way valve response performance detection system according to claim 1, characterized in that: The three-way valve response performance detection system also includes a test board, an electronic switch and an industrial computer. The first output end and the second output end of the industrial computer are electrically connected to the control end of the programmable power supply and the input end of the test board, respectively. The output end of the test board is electrically connected to the control end of the electronic switch. The input and output ends of the electronic switch are connected to the closed loop. The input end of the industrial computer is electrically connected to the output end of the signal acquisition module.

3. The three-way valve response performance detection system according to claim 2, characterized in that: The electronic switch is an NMOS tube, one end of the coil is connected to the output end of the programmable power supply through a current detection module, the other end of the coil is connected to the drain of the NMOS tube, the source of the NMOS tube is grounded, and the gate of the NMOS tube is connected to the output end of the test board.

4. The three-way valve response performance detection system according to claim 2, characterized in that: The signal acquisition module includes a signal conditioning circuit, which is a filtering circuit and / or an amplifying circuit. The two input ends of the signal conditioning circuit are respectively connected to the output end of the current detection module and the output end of the voltage detection module, and the output end of the signal conditioning circuit is connected to the input end of the industrial computer.

5. The three-way valve response performance detection system according to claim 1, characterized in that: The current detection module is a current transformer, and the voltage detection module is a voltage transformer.

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