CN115574701A - Eddy current induction type redundant linear displacement sensor - Google Patents
Eddy current induction type redundant linear displacement sensor Download PDFInfo
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- CN115574701A CN115574701A CN202211168175.4A CN202211168175A CN115574701A CN 115574701 A CN115574701 A CN 115574701A CN 202211168175 A CN202211168175 A CN 202211168175A CN 115574701 A CN115574701 A CN 115574701A
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- circuit board
- receiving coil
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- target
- base
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
Abstract
The invention discloses an eddy current induction type redundant linear displacement sensor which comprises a connector, a circuit board base, a circuit board, a target board base and a target board, wherein the circuit board is arranged on the circuit board base; the circuit board is provided with a first chip, a transmitting coil, a first receiving coil and a second receiving coil, the first chip is respectively connected with the transmitting coil, the first receiving coil and the second receiving coil, the first chip drives the transmitting coil to generate excitation voltage after being electrified, when the target plate base drives the target plate to move, the first receiving coil and the second receiving coil generate secondary voltage, and the first chip receives the secondary voltage to obtain the position of the target plate; the circuit board and the target board of the invention are not contacted, do not need magnets, do not need shielding, are not influenced by stray magnetic fields, namely adopt the design of the eddy current induction type principle, the high-resolution high-linearity high-resolution wide-range high-resolution high-linearity high-sensitivity temperature sensor has the excellent performances of high response speed, high resolution, high linearity, small signal temperature drift, magnetic field interference resistance, high temperature resistance, wide range and the like.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to an eddy current induction type redundant linear displacement sensor.
Background
Along with the development of the improvement of the automation degree to the intelligent direction, the application market of the eddy current displacement sensor is larger and larger. For passenger vehicles and non-road vehicles, oversteer is often generated when the vehicles turn at high speed, the vehicles with the rear wheel steering system can make up the driving danger caused by the oversteer, the rear wheel steering system is not directly and mechanically physically connected with the front wheel steering actuating mechanism and the steering hand feeling simulation mechanism, the rear wheel steering system belongs to a steer-by-wire component, and the safety of the linear displacement sensor is more and more outstanding when the rear wheel steering system is applied to the rear wheel steering. The existing linear displacement sensors are provided with magnets, so that the linear displacement sensors are easily influenced by a scattered magnetic field or need to be shielded by the magnetic field, the accuracy of the existing linear displacement sensors is not influenced by the magnetic field, and the cost and the structure are increased due to the fact that shielding structures are added; therefore, a displacement sensor with a simple structure and capable of resisting magnetic field interference and applied to a rear wheel steering system is urgently needed.
Disclosure of Invention
Aiming at the defects in the problems, the invention provides an eddy current induction type redundant linear displacement sensor.
In order to achieve the purpose, the invention provides an eddy current induction type redundant linear displacement sensor which comprises a connector, a circuit board base, a circuit board, a target board base and a target board, wherein the circuit board is arranged on the circuit board base;
the circuit board comprises a circuit board base, a connector, a first chip, a transmitting coil, a first receiving coil and a second receiving coil, wherein the circuit board base is provided with pins, the connector is connected with the circuit board through the pins, the circuit board is provided with the first chip, the transmitting coil, the first receiving coil and the second receiving coil, the first chip is connected with the transmitting coil, the first receiving coil and the second receiving coil respectively, the first receiving coil and the second receiving coil are in a sine shape and are printed on the circuit board in a 90-degree offset mode, the transmitting coil is printed on the circuit board and surrounds the first receiving coil and the second receiving coil, the first chip is driven after being electrified to generate excitation voltage, when the monitoring moving part drives the target board to move through the target board base, so that the first receiving coil and the second receiving coil generate secondary voltage, and the first chip receives the secondary voltage to obtain the position of the target board.
Preferably, a second chip identical to the first chip is disposed on the circuit board, and the second chip is also connected to the transmitting coil, the first receiving coil and the second receiving coil respectively.
Preferably, the portable electronic device further comprises a housing, the circuit board base is arranged on one side of the housing, the circuit board is arranged on the inner side of the housing and connected with the circuit board base, the connector is arranged on the outer side of the housing and connected with the circuit board base, one side of the target board is arranged on one side of the circuit board and is not in contact with the circuit board, and the other side of the target board is connected with the target board base.
Preferably, the target board and the circuit board are spaced 3.5mm apart.
Preferably, the target plate is made of metal and is fixed on the target plate base through injection molding.
Preferably, the first chip and the second chip are both ZMID5203 chips.
Compared with the prior art, the invention has the following beneficial effects:
the circuit board and the target board of the invention are not contacted, do not need magnets, do not need shielding, are not influenced by stray magnetic fields, namely adopt the design of the eddy current induction type principle, the high-resolution high-linearity high-resolution wide-range high-resolution high-linearity high-sensitivity temperature sensor has the excellent performances of high response speed, high resolution, high linearity, small signal temperature drift, magnetic field interference resistance, high temperature resistance, wide range and the like.
Drawings
FIG. 1 is a cross-sectional view of an eddy current induced redundant-type linear displacement sensor in accordance with the present invention;
FIG. 2 is a block diagram of a circuit board of the eddy current sensing type redundant type linear displacement sensor according to the present invention;
fig. 3 is a circuit connection diagram of a first chip and a second chip in the eddy current induction type redundant linear displacement sensor according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The invention is described in further detail below with reference to the accompanying figure 1:
the invention provides an eddy current induction type redundant linear displacement sensor which comprises a connector 1, a circuit board base 2, a circuit board 3, a target board base 5 and a target board 4, wherein the circuit board 3 is arranged on the circuit board base 2, the target board 4 is arranged on the target board base 5, the target board base 5 is arranged on a monitoring moving part 7, and the target board 4 is adjacent to the circuit board 2 and can linearly move along the length direction of the circuit board 2;
referring to fig. 1, the present embodiment further includes a housing 8, the circuit board base 2 is disposed on one side of the housing 8, the circuit board 3 is disposed on the inner side of the housing 8 and connected to the circuit board base 2, the connector 1 is disposed on the outer side of the housing 8 and connected to the circuit board base 2, one side of the target board 4 is disposed on one side of the circuit board 3 and is not in contact with the circuit board 3, and the other side is connected to the target board base 5. The monitoring moving member 7 is supported in the housing 8 for axial movement.
Specifically, the circuit board base 2 is injection-molded by a mold, pins are wrapped in the circuit board base 2 during injection molding, and the connector 1 is connected with the pins of the circuit board base 2; the circuit board base 2 is provided with a circuit board 3 positioning pin 14, when the circuit board 3 is installed, the circuit board 3 is positioned by the guide of the positioning pin 14, and after the circuit board 3 is assembled on the circuit board base 2, the circuit board 3 is fixed on the circuit board base 2 by carrying out hot melting riveting on a fixing column on the circuit board base 2; the target plate 4 is made of metal materials and fixed on the target plate base 5 through injection molding, bolt holes are formed in the target plate base 5, and the target plate base 5 is installed on the moving part 7 through bolts and moves synchronously with the moving part 7. The target plate 4 and the circuit board 3 are spaced 3.5mm apart.
In the present embodiment, when the linear displacement sensor is applied to a vehicle, the monitoring moving member 7 is a screw of a rear wheel steering system, which is connected to a tie bar of the vehicle, the tie bar is connected to a wheel, and the housing 8 may be a rear wheel steering system housing 8, that is, the connector 1, the circuit board base 2, the circuit board 3, the target board base 5 and the target board 4 are all disposed on the rear wheel steering system housing 8. When the monitoring moving part 7 moves, a pull rod of the vehicle is driven to move, and the pull rod drives the wheels to steer.
The manufacturing process of the displacement sensor comprises the following steps:
the circuit board base 2 is subjected to injection molding by adopting a mold, pins are wrapped in the circuit board base 2 during injection molding, and the connector 1 is connected with the pins of the circuit board base 2; the connector 1 is connected with the controller through a wire harness;
electronic components (the chips and the like) of the detection circuit are previously attached to the circuit board 3 and then welded;
assembling a circuit board 3 with electronic component patches welded on a circuit board base 2, and fixing the circuit board 3 on the circuit board base 2 by adopting a fixed column top hot melting mode for the circuit board 3 arranged on the circuit board base 2; then, welding pins of the circuit board 3 and the circuit board base 2;
the circuit board base 2 is fixed on a rear wheel steering system shell 8 through four screws 6, the PCBA is arranged on the circuit board base 2 through hot riveting, the target plate 4 is fixed on the target plate base 5 through a clamping groove, and the target plate base 5 is fixed on a lead screw of a rear wheel steering system through bolts to be assembled.
Referring to fig. 2, pins are arranged on a circuit board base 2, a connector 1 is connected with a circuit board 3 through the pins, a first chip 12, a transmitting coil 11, a first receiving coil 9 and a second receiving coil 10 are arranged on the circuit board 3, the first chip 12 is respectively connected with the transmitting coil 11, the first receiving coil 9 and the second receiving coil 10 are in a sine shape and are printed on the circuit board 3 at an angle of 90 degrees, the transmitting coil 11 is printed on the circuit board 3 and surrounds the first receiving coil 9 and the second receiving coil 10, the transmitting coil 11 is driven to generate an excitation voltage after the first chip 12 is electrified, when a monitoring moving component 7 drives a target plate 4 to move through the target plate base 5, the first receiving coil 9 and the second receiving coil 10 generate a secondary voltage, and the first chip 12 receives the secondary voltage to obtain the position of the target plate 4.
In particular, the three coils mentioned above are usually printed on the printed circuit board 3 in the form of copper tracks, wherein the first receiving coil 9 and the second receiving coil 10 are sinusoidal in shape and are printed on the circuit board 3 offset from each other by 90 °. The movement of the metal target plate 4 over the coil causes the transmitting coil 11 to generate a secondary voltage in the first receiving coil 9 and the second receiving coil 10, and the first chip 12 obtains the position of the target plate 4 on the coils by demodulating and processing the secondary voltage from the first receiving coil 9 and the second receiving coil 10. The first chip 12 detects that different receiving secondary voltages represent different positions of the target plate 4, so as to output a SENT signal representing different positions of the target plate 4, and the controller can judge the absolute position of the target plate 4 through the analysis of the SENT signal.
In the present embodiment, the circuit board 3 is provided with a second chip 13 which is the same as the first chip 12, and the second chip 13 is also connected to the transmitting coil 11, the first receiving coil 9 and the second receiving coil 10, respectively. While the target plate 4 is moving with the moving part 7, the first chip 12 and the second chip 13 can obtain the position of the target plate 4 on the coil by simultaneously demodulating and processing the secondary voltages from the first receiving coil 9 and the second receiving coil 10. That is, the first chip 12 and the second chip 13 are redundant with each other, that is, the redundant circuit design is used in the same space, as shown in fig. 3, in the using process, if one path of signal fails or fails, the controller can still perform the displacement control of the motor through the other path of detected position signal, thereby ensuring the working stability of the control system and having high fault tolerance of the system.
In the present embodiment, the first chip 12 and the second chip 13 are each a ZMID5203 chip.
The present invention has been described in terms of the preferred embodiment, and it is not intended to be limited to the embodiment. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The eddy current induction type redundant linear displacement sensor is characterized by comprising a connector, a circuit board base, a circuit board, a target board base and a target board, wherein the circuit board is arranged on the circuit board base;
the circuit board comprises a circuit board base, a connector, a first chip, a transmitting coil, a first receiving coil and a second receiving coil, wherein the circuit board base is provided with pins, the connector is connected with the circuit board through the pins, the circuit board is provided with the first chip, the transmitting coil, the first receiving coil and the second receiving coil, the first chip is connected with the transmitting coil, the first receiving coil and the second receiving coil respectively, the first receiving coil and the second receiving coil are in a sine shape and are printed on the circuit board in a 90-degree offset mode, the transmitting coil is printed on the circuit board and surrounds the first receiving coil and the second receiving coil, the first chip is driven after being electrified to generate excitation voltage, when the monitoring moving part drives the target board to move through the target board base, so that the first receiving coil and the second receiving coil generate secondary voltage, and the first chip receives the secondary voltage to obtain the position of the target board.
2. The eddy current-induced redundant linear displacement sensor according to claim 1, wherein a second chip identical to the first chip is disposed on the circuit board, and the second chip is also connected to the transmitter coil, the first receiver coil and the second receiver coil, respectively.
3. The eddy current induction type redundant linear displacement sensor according to claim 1, further comprising a housing, wherein the circuit board base is disposed on one side of the housing, the circuit board is disposed inside the housing and connected to the circuit board base, the connector is disposed outside the housing and connected to the circuit board base, the target board is disposed on one side of the circuit board and has no contact with the circuit board, and the other side of the target board is connected to the target board base.
4. The eddy current induced, redundant linear displacement sensor of claim 3, wherein the target board and the circuit board are spaced 3.5mm apart.
5. The eddy current induction type redundant linear displacement sensor according to claim 3, wherein the target plate is made of metal and is fixed on the target plate base through injection molding.
6. The eddy current induced redundant type linear displacement sensor of claim 3, wherein the first chip and the second chip are both ZMID5203 chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211168175.4A CN115574701A (en) | 2022-09-23 | 2022-09-23 | Eddy current induction type redundant linear displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211168175.4A CN115574701A (en) | 2022-09-23 | 2022-09-23 | Eddy current induction type redundant linear displacement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115574701A true CN115574701A (en) | 2023-01-06 |
Family
ID=84581926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211168175.4A Pending CN115574701A (en) | 2022-09-23 | 2022-09-23 | Eddy current induction type redundant linear displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115574701A (en) |
-
2022
- 2022-09-23 CN CN202211168175.4A patent/CN115574701A/en active Pending
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