An eddy current array measurement device and method for clutch slip

Abstract

A kind of clutch slip piece position eddy current array measuring device and method, it is related to the positioning field of clutch slip piece.This application is to solve the problem that the existing clutch slip piece position non-contact measuring device can only measure the clutch slip piece in disengaged position or engaged position, and cannot measure other positions and states.This application is composed of a fixed rectangular array of multiple miniature eddy current proximity switches, the installation starting position of each row of proximity switches is staggered from the installation starting position of the previous row of proximity switches by a minimum measurement distance.When the magnetically conductive measuring disc installed on the slip piece moves through the rectangular array of eddy current proximity switches, the proximity switches at different positions send effective signals in turn, and the signal processor records the time when each proximity switch sends effective signal, combined with the fixed position of each proximity switch, the position measurement curve of the slip piece is obtained.

Description

Technical Field

[0001] This invention belongs to the field of positioning technology for clutch sliding components. Background Technology

[0002] Conventional non-contact displacement sensors, such as eddy current displacement sensors, need to be positioned axially, and the longer the detection distance, the larger the sensor's diameter and length. Clutch sliding components involve both continuous rotational motion and axial sliding motion on the order of tens of millimeters, and are located between continuously rotating input and output components. The installation space for the measuring sensor can only be radial; axially arranging the displacement sensor would require increasing the clutch length, increasing the clutch's size and weight, and reducing its high-speed dynamic performance. Therefore, non-contact measurement of the axial displacement of clutch sliding components presents significant challenges.

[0003] Currently, non-contact measuring devices for determining the position of clutch slip members typically employ two small eddy current proximity switches positioned at the engagement and disengagement points of the clutch slip members. When the clutch slip members are engaged, the engagement indicator proximity switch outputs a valid signal; when they are disengaged, the disengagement indicator proximity switch outputs a valid signal. However, when the clutch slip members are in an intermediate position between engagement and disengagement, neither proximity switch outputs a valid signal, making it impossible to determine the specific position and movement state of the clutch slip members. Furthermore, when a clutch malfunctions, the location of the clutch slip members cannot be used to determine the extent of the fault. In other words, existing non-contact measuring devices for clutch slip member position have limited measurement range. Summary of the Invention

[0004] The present invention addresses the problem that existing non-contact measuring devices for the position of clutch slip members can only measure whether the clutch slip member is in the disengaged or engaged position, but cannot measure other positions and states. The present invention provides an eddy current array measuring device and method for measuring the position of clutch slip members.

[0005] An eddy current array measuring device for measuring the position of a clutch sliding member includes: a measuring disk 600, a measuring head 100, and a signal processor 700. The measuring disk 600 is fixed on the sliding member 20 of the clutch, and the measuring head 100 is fixed on the clutch housing 40.

[0006] The measuring head 100 includes m×n miniature eddy current proximity switches 400 and an electrical connector 200. The probes 410 of the m×n miniature eddy current proximity switches 400 are arranged in a rectangular array of m rows and n columns. The row and column spacing between two adjacent probes 410 is s, and the end column spacing between two adjacent rows differs by s / m. The cables 420 of the m×n miniature eddy current proximity switches 400 are all electrically connected to the signal processor 700 through the electrical connector 200. Both m and n are positive integers.

[0007] When the measuring disc moves to the Kth position... i,j When the detection range of the miniature eddy current proximity switch 400 is reached, the miniature eddy current proximity switch 400 sends a valid signal to the signal processor 700 through the electrical connector 200.

[0008] The signal processor 700 is used to record the emission time of each valid signal and calculate the displacement of the sliding member 20 at the emission time of each valid signal. It is also used to construct a position measurement curve 800 by combining the emission time of each valid signal with its corresponding displacement.

[0009] Furthermore, t is calculated using the following formula. i,j Displacement l of sliding component 20 at any time i,j :

[0010]

[0011] Where i = 1, 2, ..., m, j = 1, 2, ..., n.

[0012] Furthermore, the aforementioned eddy current array measuring device for the position of a clutch slip member further includes: a mounting plate 300, a bracket 310, and a base 320. The base 320 is fixed to the outside of the clutch housing 40, and the mounting plate 300 is fixedly connected to the base 320 via the bracket 310.

[0013] The mounting plate 300 has m×n mounting holes for placing the probe 410.

[0014] The mounting plate 300 is made of a low magnetic permeability material or a non-magnetic permeability material.

[0015] Furthermore, the mounting plate 300 is made of aluminum alloy or engineering plastic.

[0016] Furthermore, the aforementioned measuring disc 600 includes a working part 610 and a fixed part 620.

[0017] The working part 610 is located at the end of the fixed part 620.

[0018] The working part 610 is made of a magnetically conductive material.

[0019] Furthermore, the material of the aforementioned working part 610 is steel, mild steel, or ferrite.

[0020] Furthermore, the working part 610 has a thickness of H and a width of B, and the end diameter of the probe 410 is d.

[0021] Then we have: H≥2d, B≤d,

[0022] The array of m×n micro eddy current proximity switches 400 is arranged in a column orientation.

[0023] An eddy current array measurement method for the position of a clutch slip member is disclosed. The method is based on the aforementioned eddy current array measurement device for the position of a clutch slip member. The specific steps of the eddy current array measurement method are as follows:

[0024] Engaging the clutch causes the sliding component 20 to begin moving.

[0025] When the signal processor 700 receives a valid signal, it records the current time and the row and column position of the miniature eddy current proximity switch 400 on the measuring disk 600, and calculates the displacement of the measuring disk 600 at the current time based on the row and column position of the miniature eddy current proximity switch 400.

[0026] The beneficial effects of this invention patent are:

[0027] This invention enables millimeter-level measurement of the position of the sliding component, which is beneficial for comparative analysis of the movement state of the clutch sliding component. When a clutch malfunctions, the fault range can be quickly determined based on the positional displacement of the clutch sliding component. Attached Figure Description

[0028] Figure 1 A cross-sectional view of an existing clutch slip member position proximity switch measuring mechanism;

[0029] Figure 2 A cross-sectional view of the existing clutch slip member positioned between two eddy current proximity switches;

[0030] Figure 3 and Figure 4 These are all schematic diagrams illustrating the working principle of eddy current proximity switches in existing clutches. Figure 3 Indicates a disconnected state. Figure 4 Indicates the conduction state;

[0031] Figure 5 The theoretical displacement-time curve of the existing clutch sliding component;

[0032] Figure 6 and Figure 7 All are cross-sectional views of the engagement state of the measuring head and clutch in this invention, wherein... Figure 6 This indicates that the sliding component is in the disengaged position. Figure 7 This indicates that the sliding component is in the middle position;

[0033] Figure 8 This is a front sectional view of the measuring head;

[0034] Figure 9 for Figure 8 A bottom view;

[0035] Figure 10 for Figure 9 Left sectional view;

[0036] Figure 11 This is an electrical schematic diagram of the present invention;

[0037] Figure 12 This is a measurement curve of the displacement-time of the clutch sliding component obtained by the present invention;

[0038] Figure 13 A comparison chart of the theoretical and measured displacement-time curves of the clutch sliding component;

[0039] Figure 14 A detailed comparison of the theoretical and measured displacement-time curves of the clutch sliding component;

[0040] Figure 15 This is an extended arrangement diagram of the miniature proximity switch array for the measuring head.

[0041] In the figure, there is an input component 10, a sliding component 20, an output component 30, a housing 40, a measuring mechanism 50, an engagement indication proximity switch 52, a disengagement indication proximity switch 54, a measuring head 100, an electrical connector 200, a mounting plate 300, a bracket 310, a base 320, a miniature eddy current proximity switch 400, a probe 410, a cable 420, a measuring disc 600, a working part 610, a fixed part 620, a signal processor 700, a measurement curve 800, a measurement curve error 805, a theoretical curve 820, a simple fitting curve 830, and a simple fitting curve error 835. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0043] like Figure 1 and Figure 2As shown, the existing clutch slip member position measuring mechanism 50 is mounted on the stationary housing 40. The clutch input component 10 and output component 30 move in a continuous rotational motion. During clutch engagement and disengagement, the slip member 20 moves in a helical motion, which is a combination of rotational and axial motion. The measuring disc 600 is fixed to the slip member 20 and moves synchronously with the slip member 20. The engagement indication proximity switch 52 and the disengagement indication proximity switch 54 are fixed at specific positions on the measuring mechanism 50. When the clutch slip member 20 is in the engaged position, the engagement indication proximity switch 52 outputs a valid signal. When the clutch slip member 20 is in the disengaged position, the disengagement indication proximity switch 54 outputs a valid signal. When the clutch slip member 20 is in the intermediate position between engagement and disengagement, neither proximity switch outputs a valid signal. At this time, the specific position of the slip member 20 cannot be determined. When the clutch malfunctions, the fault range cannot be determined based on the position of the clutch slip member.

[0044] exist Figure 3 and Figure 4 In this paper, the working principle of the miniature eddy current proximity switch is as follows: when the measuring disk 600, made of magnetic material, is far away from the miniature eddy current proximity switch 400, the output voltage UBK at its signal terminal BK is 0; when the measuring disk 600 is close to the miniature eddy current proximity switch 400, the output voltage UBK at its signal terminal BK is U; by continuously detecting the voltage value UBK at a certain scanning time period, the moment when the measuring disk 600 and the miniature eddy current proximity switch 400 can be determined.

[0045] exist Figure 5 In the diagram, the thick solid line L'(t) represents the theoretical or actual displacement-time curve 820 of the clutch slip member, and the thin dashed line represents the simple fitting curve 830 of the clutch slip member displacement-time. The thin dashed line is fitted based on the interval between the effective signals of the engagement indication proximity switch 52 and the disengagement indication proximity switch 54, assuming that the clutch slip member moves at a constant velocity in a straight line. The derivative or slope of the thin dashed line represents the speed of the clutch slip member. The deviation between the thin dashed line and the thick solid line represents the displacement measurement error of the measuring mechanism 50, i.e., the error of the simple fitting curve 835. It can be seen that, for a displacement measurement length of 13.5S, the simple fitting curve error 835 measured by the existing clutch slip member position measuring mechanism is 1.98S absolute error and 14.67% relative error, where S is the unit of displacement measurement.

[0046] Specific implementation method one: Refer to Figures 6 to 11This embodiment describes an eddy current array measuring device for the position of a clutch sliding member, comprising: a mounting plate 300, a bracket 310, a base 320, a measuring disk 600, a measuring head 100, and a signal processor 700. The measuring disk 600 is fixed to the sliding member 20 of the clutch and can move with the sliding member 20. The base 320 is fixed to the outside of the clutch housing 40. The mounting plate 300 has m×n mounting holes arranged in an m-row-n-column rectangular array. The mounting plate 300 is fixedly connected to the base 320 via the bracket 310. The mounting plate 300 is made of a low-magnetic-permeability material or a non-magnetic material. Preferably, the mounting plate 300 is made of aluminum alloy or engineering plastic.

[0047] The measuring head 100 includes m×n miniature eddy current proximity switches 400 and electrical connectors 200. The probes 410 of each of the m×n miniature eddy current proximity switches 400 correspond one-to-one with m×n mounting holes and are embedded in the corresponding holes, extending a certain distance outwards. The row and column spacing between two adjacent probes 410 is s, and the end column spacing between two adjacent rows differs by sm. The cables 420 of each of the m×n miniature eddy current proximity switches 400 are all electrically connected to the signal processor 700 through the electrical connectors 200, where m and n are both positive integers.

[0048] The measuring disk 600 includes a working part 610 and a fixed part 620. The working part 610 is located at the end of the fixed part 620. The working part 610 has a thickness of H and a width of B. The end diameter of the probe 410 is d (s>d), then: H≥2d, B≤d. The width is the column arrangement direction of the array of m×n miniature eddy current proximity switches 400. The working part 610 is made of a magnetic material. Preferably, the working part 610 is made of steel, mild steel, or ferrite.

[0049] When the measuring disc moves to the Kth position... i,j When the detection range of a miniature eddy current proximity switch 400 is reached, the miniature eddy current proximity switch 400 sends a valid signal to the signal processor 700 through the electrical connector 200.

[0050] The signal processor 700 is used to record the emission time of each valid signal and calculate the displacement of the slider 20 at each valid signal emission time. Specifically, t is calculated using the following formula. i,j Displacement l of sliding component 20 at any time i,j :

[0051]

[0052] Where i = 1, 2, ..., m, j = 1, 2, ..., n. In this embodiment, the miniature eddy current proximity switch 400 is marked, and its location can be determined by the marked i and j.

[0053] The signal processor 700 is also used to construct a position measurement curve 800 by combining the emission time of each valid signal with its corresponding displacement.

[0054] In this embodiment, the physical resolution of the miniature eddy current proximity switch 400 is s / m, meaning that when the measuring disk 600 moves by s / m, one of the two adjacent miniature eddy current proximity switches 400 will inevitably emit a valid signal. In the circumferential direction, each row of miniature eddy current proximity switches 400 is concentrically arranged with the measuring disk 600, and the distance between them and the outer diameter R of the measuring disk 600 is u. The measuring disk 600 and each miniature eddy current proximity switch 400 are non-contact. The measuring head (100) is mechanically connected to the clutch housing 40 via the base 320, allowing for disassembly, assembly, and adjustment of the radial distance u. The electrical connector 200 is mounted on the base 320, and the bracket 310 connects the mounting plate 300 to the base 320, providing support and fixation for the mounting plate 300. The electrical connector 200 is electrically connected to the cable 420 of each miniature eddy current proximity switch 400, meaning that the valid signal of each miniature eddy current proximity switch 400 is output externally through the electrical connector 200. A specific embodiment of the electrical connector 200 is an aviation plug.

[0055] The following are the preferred values ​​for each parameter in a practical application: d = 3mm, m = 4mm, n = 15mm, s = 4mm.

[0056] Specific Implementation Method Two: The eddy current array measurement method for the position of a clutch slip member described in this embodiment is based on the eddy current array measurement device for the position of a clutch slip member described in Specific Implementation Method One above.

[0057] The specific steps of the eddy current array measurement method are as follows:

[0058] Engaging the clutch causes the sliding component 20 to begin moving.

[0059] When the signal processor 700 receives a valid signal, it records the current time and the row and column position of the miniature eddy current proximity switch 400 on the measuring disk 600, and calculates the displacement of the measuring disk 600 at the current time based on the row and column position of the miniature eddy current proximity switch 400.

[0060] t is calculated using the following formula. i,j Displacement l of sliding component 20 at any time i,j :

[0061]

[0062] Where i = 1, 2, ..., m, j = 1, 2, ..., n, m and n are the number of rows and columns of the rectangular array formed by the miniature eddy current proximity switches 400, and s is the row and column spacing between two adjacent probes 410.

[0063] like Figure 12 As shown in Figure 14, the measurement curve 800 of the clutch slip member position is obtained from l i,j and t i,j The curve consists of m×n-1 broken line segments. The theoretical or actual curve of L(t) versus the displacement-time of the clutch slipper is 820L'(t), which has a measurement curve error of 805. Figure 14 In the specific embodiment, the absolute error of the measurement curve error 805 is 0.13S, and the relative error is 0.963%.

[0064] Figure 15 In this invention, when the displacement of the sliding component of a large clutch is relatively long, the number of columns n of the micro eddy current proximity switch 400 array can be increased to expand the measurement range of the invention, and the number of rows m of the micro eddy current proximity switch 400 array can be increased to improve the measurement accuracy of the invention.

[0065] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. An eddy current array measuring device for the position of a clutch slip member, comprising: The measuring disc (600), measuring head (100), and signal processor (700) are provided, wherein the measuring disc (600) is fixed on the sliding part (20) of the clutch, and the measuring head (100) is fixed on the cover (40) of the clutch. The measuring head (100) is characterized by comprising m×n miniature eddy current proximity switches (400) and an electrical connector (200). The probes (410) of the m×n miniature eddy current proximity switches (400) are arranged in a rectangular array of m rows and n columns. The row and column spacing between two adjacent probes (410) is s, and the end column spacing between two adjacent rows differs by sm. The cables (420) of the m×n miniature eddy current proximity switches (400) are all electrically connected to the signal processor (700) through the electrical connector (200). Both m and n are positive integers. When the measuring disk (600) moves to the Kth position i,j When the detection range of a miniature eddy current proximity switch (400) is reached, the miniature eddy current proximity switch (400) sends a valid signal to the signal processor (700) through the electrical connector (200). The signal processor (700) is used to record the emission time of each valid signal and calculate the displacement of the sliding member (20) at the emission time of each valid signal. It is also used to construct a position measurement curve (800) by combining the emission time of each valid signal with its corresponding displacement.

2. The eddy current array measuring device for the position of a clutch slip member according to claim 1, characterized in that, t is calculated using the following formula. i,j Displacement l of the sliding element (20) at any time i,j : Where i = 1, 2, ..., m, j = 1, 2, ..., n.

3. The eddy current array measuring device for the position of a clutch slip member according to claim 1, characterized in that, It also includes: a mounting plate (300), a bracket (310), and a base (320), wherein the base (320) is fixed to the outside of the clutch housing (40), and the mounting plate (300) is fixedly connected to the base (320) via the bracket (310). The mounting plate (300) has m×n mounting holes for placing the probe (410). The mounting plate (300) is made of a low magnetic permeability material or a non-magnetic material.

4. The eddy current array measuring device for the position of a clutch slip member according to claim 3, characterized in that, The mounting plate (300) is made of aluminum alloy or engineering plastic.

5. The eddy current array measuring device for the position of a clutch slip member according to claim 1, characterized in that, The measuring disc (600) includes a working part (610) and a fixed part (620). The working part (610) is located at the end of the fixed part (620). The working part (610) is made of a magnetic material.

6. The eddy current array measuring device for the position of a clutch slip member according to claim 5, characterized in that, The working part (610) is made of steel, mild steel or ferrite.

7. The eddy current array measuring device for the position of a clutch slip member according to claim 5, characterized in that, The working part (610) has a thickness of H and a width of B, and the end diameter of the probe (410) is d. Then we have: H≥2d, B≤d, The array of m×n miniature eddy current proximity switches (400) is arranged in a column orientation.

8. A method for measuring the position of a clutch slip element using an eddy current array, characterized in that, The eddy current array measurement method is implemented based on the eddy current array measurement device for the position of a clutch slip member as described in any one of claims 1 to 7. The specific steps of the eddy current array measurement method are as follows: Engaging the clutch causes the sliding component (20) to begin moving. When the signal processor (700) receives a valid signal, it records the current time and the row and column position of the miniature eddy current proximity switch (400) that detected the measuring disk (600), and calculates the displacement of the measuring disk (600) at the current time based on the row and column position of the miniature eddy current proximity switch (400).

9. The eddy current array measurement method for the position of a clutch slip member according to claim 8, characterized in that, t is calculated using the following formula. i,j Displacement l of the sliding element (20) at any time i,j : Where i = 1, 2, ..., m, j = 1, 2, ..., n, m and n are the number of rows and columns of the rectangular array formed by the miniature eddy current proximity switches (400), and s is the row and column spacing between two adjacent probes (410).

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