Angle sensor and automatic gearbox

Abstract

The utility model discloses an angle sensor and an automatic gearbox, the angle sensor comprises a sensor shell, a magnet support and a PCBA board, the magnet support is embedded in the sensor shell in a directional rotation mode, and a gear shifting arm rotating shaft channel is formed in the middle of the magnet support and used for installing a gear shifting arm rotating shaft; the gear shifting arm rotating shaft can penetrate through the sensor shell in the direction perpendicular to the rotating direction of the magnet support, an odd number of magnets are evenly distributed on the outer side of the magnet support to form a magnet array which is sequentially distributed in an attached mode, the number of the magnets in the magnet array is larger than or equal to three, and all the magnets in the magnet array have the preset magnetizing direction. And the PCBA board is fixedly arranged in the sensor shell and is provided with a Hall chip which is opposite to the magnet array, so that more than 95% of the magnetic field is positioned below the magnet. According to the angle sensor and the automatic gearbox, the influence of the gear shifting arm on the magnetic field can be basically eradicated, and the output accuracy of the angle sensor is effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor equipment, in particular to an angle sensor and an automatic transmission. Background Art

[0002] Angle sensors are widely used in automatic transmissions, mainly to detect the gear position of the transmission. The driver controls the rotation angle of the angle sensor by manipulating the gear lever in the cockpit. At different angles, the angle sensor outputs corresponding analog signals or PWM signals. The transmission control unit (TCU) detects the analog or PWM signal of the angle sensor and calculates the current gear position, thereby accurately controlling the gear position, improving the shifting quality, improving the driving performance of the car, saving fuel consumption, and improving driving and riding comfort.

[0003] At present, most angle sensors use the Hall principle. The shift arm drives the magnet inside the sensor to rotate, causing the magnetic field to change. The Hall chip detects the changing magnetic field and converts the changing magnetic field into an analog signal or PWM output through calculation.

[0004] Generally, a whole arc-shaped magnet is placed inside the angle sensor. When the angle changes, the shift arm drives the magnet to rotate, and by detecting the magnetic field generated at different positions, the changing magnetic field is converted into the corresponding angle position. However, the magnetic field is easily affected by external ferromagnetic materials, resulting in large output deviations of the angle sensor and low control accuracy. Utility Model Content

[0005] One advantage of the utility model is that it provides an angle sensor and an automatic transmission, wherein the magnet array on the outside of the magnet bracket is composed of an odd number of magnets greater than or equal to three, and each magnet has a predetermined magnetization direction, so that more than 95% of the magnetic field is located below the magnet, that is, away from the side of the shift arm, thereby basically eliminating the influence of the shift arm as a conductive material on the magnetic field, and further effectively ensuring the output accuracy of the angle sensor, ensuring the shifting quality, and ensuring the driving and riding comfort.

[0006] In order to achieve at least one of the above advantages of the utility model, in a first aspect, the utility model provides an angle sensor, comprising a sensor housing, a magnet bracket and a PCBA board, wherein the sensor housing is fixed on an automatic transmission, wherein the magnet bracket is embedded in the sensor housing in a manner that allows it to be directional and rotatable, and the magnet bracket is provided with a shift arm shaft channel at a middle position for installing the shift arm shaft, and enables the shift arm shaft to pass through the sensor housing in a direction perpendicular to the rotation direction of the magnet bracket, wherein the magnet bracket is evenly provided with an odd number of magnets on the outside to form a magnet array that is sequentially fitted and distributed, the number of magnets in the magnet array is greater than or equal to three, and all magnets in the magnet array have a predetermined magnetizing direction, so that more than 95% of the magnetic field is located below the magnet, wherein the below of the magnet refers to a side away from the shift arm, wherein the PCBA board is fixedly arranged in the sensor housing, and the PCBA board is provided with a Hall chip facing the magnet array at one end close to the magnet array to sense changes in the magnetic field when the magnet array rotates.

[0007] According to an embodiment of the present invention, the magnet array includes three magnets, five magnets, seven magnets or nine magnets.

[0008] According to an embodiment of the utility model, the predetermined magnetizing direction includes horizontal and vertical directions, wherein the horizontal direction refers to the direction of rotation of the magnet holder, and the vertical direction refers to the direction perpendicular to the rotation direction of the magnet holder. The predetermined magnetizing direction is: the magnetizing directions at the boundaries on both sides are horizontal, the magnets with horizontal and vertical magnetizing directions are alternately distributed in sequence, and the magnetizing directions of two adjacent magnets with the horizontal magnetizing direction are symmetrically facing outward or inward, the magnetizing directions of two adjacent magnets with the vertical magnetizing direction are opposite, and the magnet with the magnetizing direction facing the bottom of the magnet array is located between the two adjacent magnets with the magnetizing direction facing inward.

[0009] According to an embodiment of the utility model, the magnet array includes three magnets, wherein the magnetization directions of the magnets near the two sides are symmetrically oriented inward, and the magnetization direction of the magnet near the middle is oriented downward of the magnet array.

[0010] According to one embodiment of the utility model, the magnet array includes five magnets, wherein the magnetization directions of the five magnets are, from left to right: toward the inside, toward the bottom of the magnet array, symmetrical with the magnetization direction of the leftmost magnet, toward the top of the magnet array, and toward the outside.

[0011] According to one embodiment of the utility model, the magnet array includes seven magnets, wherein the magnetization direction of the middle magnet is toward the top of the magnet array, and the magnetization directions of the three magnets located on both sides of the middle magnet are consistent, namely: the magnetization directions of the magnets located on both sides are symmetrically toward the inside, and the magnetization direction of the magnet located in the middle is toward the bottom of the magnet array.

[0012] According to one embodiment of the utility model, the magnet array includes nine magnets, wherein the magnetization directions of the nine magnets are, from left to right: toward the right side, toward the bottom of the magnet array, toward the left side, toward the top of the magnet array, toward the right side, toward the bottom of the magnet array, toward the left side, toward the top of the magnet array, and toward the right side.

[0013] In a second aspect, the utility model also provides an automatic transmission, comprising a shift arm, a shift arm shaft and the aforementioned angle sensor, wherein the shift arm shaft is vertically connected to the shift arm, wherein the shift arm shaft is fixedly embedded in the shift arm shaft channel of the magnet bracket and passes through the sensor housing in a direction vertical to the rotation direction of the magnet bracket, wherein the shift arm is located above the magnet array.

[0014] These and other purposes, features and advantages of the present invention are fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of an angle sensor according to a preferred embodiment of the present application is shown.

[0016] Figure 2 A schematic diagram of the partial structure of an angle sensor according to a preferred embodiment of the present application is shown when viewed from above.

[0017] Figure 3 A partial structural schematic diagram of the automatic transmission in the present application is shown.

[0018] Figure 4 A schematic diagram of magnetic field distribution around a magnet in the prior art is shown.

[0019] Figure 5 A schematic diagram showing the influence of the shift arm on the magnetic field in the prior art is shown.

[0020] Figure 6 A schematic diagram of the magnetic field distribution around the magnet in this application is shown.

[0021] Figure 7 A schematic diagram showing the effect of the shift arm on the magnetic field in the present application is shown.

[0022] Figure 8 A schematic diagram showing the magnetization directions of three magnets in the magnet array of the present application is shown.

[0023] Fig. 9 A schematic diagram showing the magnetization directions of five magnets in the magnet array of the present application is shown.

[0024] Fig.10 A schematic diagram showing the magnetization directions of seven magnets in the magnet array of the present application is shown.

[0025] Fig.11 A schematic diagram of the magnetic field distribution of seven magnets in the magnet array of the present application is shown.

[0026] Fig.12 A schematic diagram showing the magnetization directions of nine magnets in the magnet array of the present application is shown. DETAILED DESCRIPTION

[0027] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0028] Those skilled in the art should understand that, in the disclosure of the specification, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0029] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0030] refer to Figures 1 to 3An angle sensor according to a preferred embodiment of the utility model will be described in detail below, wherein the angle sensor 100 includes a sensor housing 10, a magnet bracket 20 and a PCBA board 30, wherein the sensor housing 10 is fixed on an automatic transmission, wherein the magnet bracket 20 is embedded in the sensor housing 10 in a manner that allows it to be directional and rotatable, and the magnet bracket 20 is provided with a shift arm shaft channel 201 at a middle position for installing a shift arm shaft 41, and the shift arm shaft 41 is enabled to pass through the sensor housing 10 in a direction perpendicular to the rotation direction of the magnet bracket 20, so that when the shift arm 40 is rotated, the magnet bracket 20 can be directly driven to directional rotate in the sensor housing 10, and the magnet bracket 20 is evenly provided with an odd number of magnets 51 on the outside to form a magnet array 50 that is sequentially fitted and distributed, and the magnet array 50 is The number of the magnets 51 is greater than or equal to three, and all the magnets 51 in the magnet array 50 have a predetermined magnetization direction, so that more than 95% of the magnetic field is located below the magnet 51, wherein the below of the magnet 51 refers to the side away from the shift arm 40. In addition, the PCBA board 30 is fixedly arranged in the sensor housing 10, and the PCBA board 30 is installed with a Hall chip 31 facing the magnet array 50 at one end close to the magnet array 50 to sense the change of the magnetic field when the magnet array 50 rotates. In this way, since there is basically no magnetic field above the magnet 51 (the magnetic field is less than 5%), when the shift arm 40 made of conductive material above the magnetic field works, it basically does not affect the magnetic field of the angle sensor 100, thereby effectively ensuring the output accuracy of the angle sensor 100, ensuring the shift quality and driving and riding comfort;

[0031] In addition, it is also worth noting that since the present application does not use a whole magnet, but is composed of an odd number of magnets 51 greater than or equal to three, the overall volume of the magnet array 50 can be reduced. At the same time, since the magnetic field is diffusely distributed in space, and there is basically no magnetic field on one side of the magnet array 50, most of the magnetic field is concentrated below the magnet array 50. Therefore, for magnets of the same volume, the effective magnetic field generated by this magnet array 50 will be much larger than the effective magnetic field generated by a whole magnet, thereby allowing the present application to use a smaller magnet array, which can effectively reduce costs and save materials.

[0032] In the traditional design, a whole arc-shaped magnet is selected, and the magnetic field is evenly distributed around the magnet, such as Figure 4 and Figure 5As shown, the red part in the middle is a magnet; if a magnetic material is placed above the magnet, since the magnetic permeability of the magnetic material is much smaller than the magnetic permeability of air, the magnetic field will be transmitted along the path of the magnetic material, changing the original magnetic field distribution, causing the magnetic field distribution around the magnetic field to change. The angle sensor needs to be calibrated before leaving the factory, and there is no shift arm during calibration. However, when the customer actually uses it, the shift arm will be installed, which will cause the magnetic field of the angle sensor to change, resulting in a large output deviation of the angle sensor.

[0033] In the present application, an odd number of magnets 51 greater than or equal to three are arranged to form a magnet array 50, and each magnet 51 has a predetermined magnetization direction, so that the magnetic lines of force of the magnet are distributed at one end of the magnet, that is, there is almost no magnetic field above the magnet array 50, and more than 95% of the magnetic field is distributed below the magnet array 50. In this way, even if a magnetic conductive material, such as a shift arm, is placed above the magnet array 50, it will hardly affect the magnetic field below the magnet array 50, thereby ensuring the output accuracy of the angle sensor 100 and the shift quality. This basically unaffected effect is shown in the figure below. Figure 6 and Figure 7 shown.

[0034] In one embodiment, the magnet array 50 includes three magnets 51 , five magnets 51 , seven magnets 51 , or nine magnets 51 .

[0035] In one embodiment, the predetermined magnetizing direction includes horizontal and vertical directions, wherein the horizontal direction refers to the direction in which the magnet support 20 rotates, and the vertical direction refers to the direction perpendicular to the direction in which the magnet support 20 rotates. The predetermined magnetizing direction is: the magnetizing directions at both side boundaries are horizontal, and the magnets 51 with horizontal and vertical magnetizing directions are alternately distributed in sequence, and the magnetizing directions of two adjacent magnets 51 with horizontal magnetizing directions are symmetrically facing outward or inward, and the magnetizing directions of two adjacent magnets 51 with vertical magnetizing directions are opposite, and the magnet 51 with a magnetizing direction facing the bottom of the magnet array 50 is located between two adjacent magnets 51 with a magnetizing direction facing inward.

[0036] In one embodiment, Figure 8 As shown, the magnet array 50 includes three magnets 51 , wherein the magnetization directions of the magnets 51 near the two sides are symmetrically oriented inward, and the magnetization direction of the magnet 51 near the middle is oriented downward of the magnet array 50 .

[0037] In one embodiment, Fig. 9As shown, the magnet array 50 includes five magnets 51, wherein the magnetization directions of the five magnets 51 are, from left to right: toward the inside, toward the bottom of the magnet array 50, symmetrical with the magnetization direction of the leftmost magnet 51, toward the top of the magnet array 50, and toward the outside.

[0038] In one embodiment, Fig.10 and Fig.11 As shown, the magnet array 50 includes seven magnets 51, wherein the magnetization direction of the middle magnet 51 is toward the top of the magnet array 50, and the magnetization directions of the three magnets 51 located on both sides of the middle magnet 51 are consistent, namely: the magnetization directions of the magnets 51 located on both sides are symmetrically toward the inside, and the magnetization direction of the middle magnet 51 is toward the bottom of the magnet array 50.

[0039] In one embodiment, Fig.12 As shown, the magnet array 50 includes nine magnets 51, wherein the magnetization directions of the nine magnets 51 are from left to right: toward the right, toward the bottom of the magnet array 50, toward the left, toward the top of the magnet array 50, toward the right, toward the bottom of the magnet array 50, toward the left, toward the top of the magnet array 50, and toward the right.

[0040] Second, combining Figures 1 to 3 The utility model also provides an automatic transmission, including a shift arm 40, a shift arm shaft 41 and the aforementioned angle sensor 100, wherein the shift arm shaft 41 is vertically connected to the shift arm 40, wherein the shift arm shaft 41 is fixedly embedded in the shift arm shaft channel 201 of the magnet bracket 20, and passes through the sensor housing 10 in a vertical direction of the rotation direction of the magnet bracket 20, wherein the shift arm 40 is located above the magnet array 50. Since the various excellent characteristics of the aforementioned angle sensor 100 have been described in detail, the automatic transmission provided by the present application also has the various excellent characteristics of the forward viewing angle sensor 100, which will not be described in detail herein.

[0041] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. An angle sensor, characterized in that The invention comprises a sensor housing, a magnet bracket and a PCBA board, wherein the sensor housing is fixed on an automatic transmission, wherein the magnet bracket is embedded in the sensor housing in a directional rotatable manner, and a shift arm shaft channel is provided at a middle position of the magnet bracket for installing the shift arm shaft, so that the shift arm shaft can pass through the sensor housing in a direction perpendicular to the rotation direction of the magnet bracket, wherein an odd number of magnets are evenly arranged on the outer side of the magnet bracket to form a magnet array that is sequentially fitted and distributed, the number of magnets in the magnet array is greater than or equal to three, and all magnets in the magnet array have a predetermined magnetizing direction, so that more than 95% of the magnetic field is located below the magnet, wherein the below of the magnet refers to a side away from the shift arm, wherein the PCBA board is fixedly arranged in the sensor housing, and a Hall chip facing the magnet array is installed at one end of the PCBA board close to the magnet array to sense changes in the magnetic field when the magnet array rotates.

2. The angle sensor according to claim 1, characterized in that: The magnet array includes three magnets, five magnets, seven magnets or nine magnets.

3. The angle sensor according to claim 2, characterized in that: The predetermined magnetizing direction includes horizontal and vertical directions, wherein the horizontal direction refers to the direction in which the magnet holder rotates, and the vertical direction refers to the direction perpendicular to the direction in which the magnet holder rotates. The predetermined magnetizing direction is: the magnetizing directions at the boundaries on both sides are horizontal, the magnets with horizontal and vertical magnetizing directions are alternately distributed in sequence, and the magnetizing directions of two adjacent magnets with the horizontal magnetizing direction are symmetrically facing outward or inward, the magnetizing directions of two adjacent magnets with the vertical magnetizing direction are opposite, and the magnet with the magnetizing direction facing the bottom of the magnet array is located between the two adjacent magnets with the magnetizing direction facing inward.

4. The angle sensor according to claim 3, characterized in that: The magnet array includes three magnets, wherein the magnets near the two sides have magnetization directions symmetrically facing inwards, and the magnetization direction of the magnet near the middle faces downwards of the magnet array.

5. The angle sensor according to claim 3, characterized in that: The magnet array includes five magnets, wherein the magnetization directions of the five magnets are, from left to right: toward the inside, toward the bottom of the magnet array, symmetrical with the magnetization direction of the leftmost magnet, toward the top of the magnet array, and toward the outside.

6. The angle sensor according to claim 3, characterized in that: The magnet array includes seven magnets, wherein the magnetization direction of the middle magnet is toward the top of the magnet array, and the magnetization directions of the three magnets located on both sides of the middle magnet are consistent, namely: the magnetization directions of the magnets located on both sides are symmetrically toward the inside, and the magnetization direction of the magnet located in the middle is toward the bottom of the magnet array.

7. The angle sensor according to claim 3, characterized in that: The magnet array includes nine magnets, wherein the magnetization directions of the nine magnets are, from left to right: toward the right side, toward the bottom of the magnet array, toward the left side, toward the top of the magnet array, toward the right side, toward the bottom of the magnet array, toward the left side, toward the top of the magnet array, and toward the right side.

8. Automatic transmission, characterized in that, It includes a shift arm, a shift arm shaft and an angle sensor as described in any one of claims 1 to 7, wherein the shift arm shaft is vertically connected to the shift arm, wherein the shift arm shaft is fixedly embedded in the shift arm shaft channel of the magnet bracket and passes through the sensor housing in a direction vertical to the rotation direction of the magnet bracket, wherein the shift arm is located above the magnet array.

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