Device for measuring rotation angle of handlebar

Abstract

The utility model relates to a handlebar rotation angle measuring device, and belongs to the technical field of steering instruments. The device comprises a connecting pipe connected with a three-star column, the periphery of the connecting pipe is sleeved with a main pipe, the connecting pipe synchronously rotates along with swing of a handlebar, the main pipe is fixedly connected with a frame, and the main pipe keeps still when the connecting pipe rotates; a Hall sensor and a magnetic block are respectively arranged on the main pipe and the connecting pipe; when the handlebar rotates, the relative position between the Hall sensor and the magnetic block changes, and the magnetic field intensity sensed by the Hall sensor changes along with the change of the rotation angle. According to the utility model, the Hall sensor and the magnetic block are respectively arranged on the main pipe and the connecting pipe, and the relative position of the Hall sensor and the magnetic block can be represented by calculating the magnetic induction intensity, so that the problem of collecting the steering angle of the handlebar is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of steering equipment, in particular to a device for measuring the rotation angle of a steering wheel. Background Art

[0002] Two-wheeled electric vehicles have been developed for more than 20 years. Nowadays, more and more sensors are used in vehicles, such as gyroscope sensors or nine-axis acceleration sensors. With the help of these sensors, the steering angle of the vehicle's steering wheel can be calculated. However, these sensors often have an integral drift problem, that is, the data will be inaccurate after long-term use, and these sensors cannot obtain the initial absolute angle; if the geomagnetic induction is added, although it is feasible to a certain extent, the vehicle needs to perform complex steering calibration operations (the pointer direction of the mobile phone map also requires the user to rotate the phone to calculate accurately). In actual application, it has great limitations and does not meet the needs of instantaneous extraction of absolute angle values.

[0003] Therefore, there is an urgent need to develop a vehicle steering rotation angle measuring device. Utility Model Content

[0004] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a vehicle handlebar rotation angle measurement device to solve the problem of collecting the steering angle of a two-wheeled vehicle handlebar. The device can simultaneously collect absolute angle, relative angle, angular velocity, and angular acceleration. The solution is easy to assemble and low in cost.

[0005] The technical solution adopted by the present invention is as follows: a device for measuring the rotation angle of a car faucet, including a connecting pipe connected to a three-star column, a main pipe sleeved on the periphery of the connecting pipe, the connecting pipe rotating synchronously with the swing of the car faucet, the main pipe fixedly connected to the vehicle frame, and the main pipe remains stationary when the connecting pipe rotates; a Hall sensor and a magnetic block are respectively installed on the main pipe and the connecting pipe; when the car faucet rotates, the relative position between the Hall sensor and the magnetic block changes, and the strength of the magnetic field induced by the Hall sensor changes with the change of the rotation angle.

[0006] As a further improvement of the above technical solution:

[0007] In one embodiment, a fixed sensor bracket is added to the periphery of the main pipe, a Hall plate is assembled at the bottom of the sensor bracket, and a Hall sensor is installed at the bottom of the Hall plate; a magnetic block mounting bracket is provided at the connecting pipe connected to the middle of the lower base plate of the three-star column, and a matching magnetic block is arranged in the magnetic block mounting bracket, and the magnetic block is radially magnetized; the Hall sensor is directly opposite the magnetic block, and when the magnetic block mounting bracket rotates with the connecting pipe, the Hall sensor always faces the magnetic block; the magnetic block mounting bracket is based on the center of the connecting pipe and rotates around the center of the circle, and during the rotation of the magnetic block mounting bracket, the Hall sensor always faces the magnetic block;

[0008] Alternatively, a magnetic block mounting bracket is added to the periphery of the main pipe and a matching magnetic block is set in the magnetic block mounting bracket to radially magnetize the magnetic block; a sensor bracket is added to the connecting pipe connected to the middle of the lower base plate of the three-star column, the bottom of the sensor bracket is equipped with a Hall plate, and a Hall sensor is installed at the bottom of the Hall plate; the Hall sensor is directly opposite the magnetic block, and when the sensor bracket rotates with the connecting pipe, the Hall sensor is always opposite to the magnetic block; the sensor bracket is based on the center of the connecting pipe and rotates around the center of the circle, and when the sensor bracket rotates, the Hall sensor is always directly opposite to the magnetic block;

[0009] Alternatively, a sensor bracket is added to the connecting pipe at the faucet on the upper part of the three-star column, a Hall plate is assembled at the bottom of the sensor bracket, and a Hall sensor is installed at the bottom of the Hall plate; a magnetic block mounting bracket is added to the main pipe fixedly connected to the vehicle frame, a magnetic block is set in the magnetic block mounting bracket, and the magnetic block is radially magnetized; when the faucet rotates, the sensor bracket drives the Hall sensor to rotate synchronously with the center of the connecting pipe of the vehicle head as the reference, and the Hall sensor always rotates directly opposite the magnetic block;

[0010] Alternatively, a Hall effect sensor and a magnetic block are installed on the main pipe and the connecting pipe respectively; the Hall effect sensor is placed parallel to the side of the magnetic block; when the faucet rotates, the Hall effect sensor and the magnetic block rotate relative to each other, and their relative positions change. The magnetic field strength sensed by the Hall effect sensor changes with the rotation angle;

[0011] Furthermore, the Hall sensor is placed parallel to the inner circle position or the outer circle position of the side of the magnetic block;

[0012] Furthermore, the magnetization direction of the magnetic block is the tangent direction of the arc center point of the magnetic block.

[0013] The beneficial effects of the utility model are as follows:

[0014] The utility model has a reasonable structure and is easy to assemble. Based on the principle that the connecting pipe swings with the handlebars while the main pipe and the frame are fixed, a Hall sensor and a magnetic block are respectively installed on the connecting pipe and the main pipe. By calculating the magnetic induction intensity, the relative position of the Hall sensor and the magnetic block can be characterized. Since the main pipe is fixed, the absolute position on the main pipe can be set to 0. The relative position of the Hall sensor and the magnetic block plus the absolute position set on the main pipe can be used to obtain the absolute position of the Hall sensor, that is, the absolute angle of the handlebars. Based on the difference in the absolute angles (the change brought about by the swing of the handlebars), the steering angle, steering angular velocity and steering angular acceleration of the electric vehicle's handlebars can be obtained, thereby finally solving the problem of collecting the steering angle of the handlebars of two-wheeled vehicles and providing tools and data support for the digital detection of the handlebars of two-wheeled electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1This is a schematic diagram of the existing electric vehicle three-star column structure.

[0016] Figure 2 It is a schematic diagram of the overall layout structure of the utility model.

[0017] Figure 3 for Figure 2 The structural diagram after the sensor bracket is hidden in the figure.

[0018] Figure 4 It is a three-dimensional diagram of the overall structure of the utility model.

[0019] Figure 5 This is a schematic diagram of the cooperation between the Hall sensor and the magnetic block in the utility model.

[0020] Figure 6 Schematic diagram of the relative position of the Hall sensor and the magnetic block in the positive direction state.

[0021] Figure 7 Schematic diagram of the relative position of the Hall sensor and the magnetic block in the right turn state.

[0022] Figure 8 Schematic diagram of the relative position of the Hall sensor and the magnetic block in the left turn state.

[0023] Figure 9 This is a schematic diagram of the parallel radial magnetization of the magnetic block in the present invention.

[0024] Figure 10 Schematic diagram of the system architecture of the Hall sensor of the present invention.

[0025] Figure 11 This is a test curve of the steering wheel rotation angle-magnetic induction intensity of the present invention.

[0026] Figure 12 This is a schematic diagram of the steering wheel rotation angle-sensing system error of the present invention.

[0027] Figure 13 This is a schematic diagram of the installation position of the utility model in the second embodiment.

[0028] Figure 14 This is a schematic diagram of the cooperation between the Hall sensor and the magnet in the third embodiment of the present invention.

[0029] Figure 15 This is a schematic diagram of the cooperation between the Hall sensor and the magnet in the fourth embodiment of the present invention.

[0030] Among them: 1. Connecting pipe; 2. Three-star column; 3. Main pipe; 4. Sensor bracket; 5. Magnetic block mounting bracket; 6. Magnetic block; 7. Hall plate; 8. Hall sensor. DETAILED DESCRIPTION

[0031] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0032] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be provided below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to facilitate a more thorough and comprehensive understanding of the disclosure of the present invention.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of this invention are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] In the case of using “including,” “having,” and “comprising” described herein, another component may be added unless a clear limiting term such as “only,” “consisting of,” etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as having one number.

[0035] It should be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of the present invention.

[0036] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0037] Example 1:

[0038] like Figures 1 to 12 , shows a schematic diagram of the structural state of a steering wheel rotation angle measuring device in one embodiment of the present invention; for the convenience of description, the accompanying drawings only show the structure related to the first embodiment of the present invention.

[0039] In this embodiment, a device for measuring the rotation angle of a vehicle faucet is provided. The device includes a connecting pipe 1 connected to a three-star column 2. A main pipe 3 is sleeved around the outer periphery of the connecting pipe 1. The connecting pipe 1 rotates synchronously with the swing of the vehicle faucet. The main pipe 3 is fixedly connected to the vehicle frame so that the main pipe 3 remains stationary when the connecting pipe 1 rotates. A Hall effect sensor 8 and a magnetic block 6 are respectively mounted on the main pipe 3 and the connecting pipe 1.

[0040] Specifically, a fixed sensor bracket 4 is added to the periphery of the main pipe 3, a Hall plate 7 is assembled at the bottom of the sensor bracket 4, and a Hall sensor 8 is installed at the bottom of the Hall plate 7; a magnetic block mounting bracket 5 is set at the connecting pipe 1 connected to the middle part of the lower bottom plate of the three-star column 2, and a matching magnetic block 6 is set in the magnetic block mounting bracket 5. The magnetic block 6 is radially magnetized, and the Hall sensor 8 is facing the magnetic block 6. In the process of the magnetic block mounting bracket 5 rotating with the connecting pipe 1, the Hall sensor 8 is always opposite the magnetic block 6;

[0041] When the steering wheel rotates, the relative position between the Hall sensor 8 and the magnet 6 changes, and the intensity of the magnetic field sensed by the Hall sensor 8 changes with the change of the rotation angle; the magnet mounting bracket 5 rotates around the center of the connecting tube 1 with the center as the reference, and the Hall sensor 8 is always facing the magnet 6 during the rotation of the magnet mounting bracket 5.

[0042] In this embodiment, since there is a fender under the lower base plate of the Samsung column 2, and a tire under the fender, and there is a cavity above the lower base plate of the Samsung column 2, this installation position is relatively less susceptible to environmental interference, making it easier to protect and maintain the device.

[0043] In this embodiment, taking the installation method of embodiment 1 as an example, the specific measurement process is as follows:

[0044] First, the magnetic block 6 adopts N35 semicircular arc 180° bar magnetic block, the outer ring diameter of the magnetic block 6 is 156mm, the inner ring diameter is 120mm, and the height is 10mm. The magnetic block 6 is radially magnetized. The magnetization method is as follows: Figure 9 As shown in the figure, this magnetization method can make the induced magnetic field strength change linearly (related to the angle) when the sensor rotates around the center of the circle;

[0045] Second, let the left side of the magnetic block 6 be -90 degrees, the right side be +90 degrees, and the middle be 0 degrees. Usually, a two-wheeled electric vehicle can rotate a maximum of 45 degrees to the left and a maximum of 45 degrees to the right, for a total rotation range of 90 degrees.

[0046] Third, the Hall sensor 8 is a bipolar linear Hall sensor, which is mounted on the sensor bracket 4 and the distance between the bottom surface of the Hall sensor 8 chip and the surface of the magnetic block 6 is controlled to be 7.75 mm. The bipolar linear Hall sensor is a Hall sensor that can sense and distinguish between the north pole and the south pole.

[0047] Fourth, let the 0 degree direction of the magnetic block 6 represent the positive direction of the car, and install the three-dimensional bipolar linear Hall sensor in front of the main tube 3, aligned with the 0 degree line of the magnetic block 6, as shown Figure 6 The schematic diagram of the positive direction is shown;

[0048] Fifth, the Hall sensor 8 is powered by 5V DC and is in the same power network as the vehicle computer unit and is connected via a data line. The Hall sensor 8 outputs a digital signal of the magnetic field strength, and the angle value is obtained by the calculation unit;

[0049] Sixth, as Figure 11 The figure shows the steering wheel rotation angle-magnetic induction test curve of the present invention. The X-axis test curve is relatively accurate. The magnetic field strength value of the sensor system can be directly read. The vehicle computer system fits the curve into a formula and substitutes the independent variable X-axis magnetic field strength value to obtain the absolute angle value of the steering wheel. The angular velocity and angular acceleration can also be calculated based on the measurement time. In addition, the Z-axis test curve has a certain deviation.

[0050] Seventh, such as Figure 12 The figure shows the error diagram of the steering wheel rotation angle-sensing system of the present invention. It can be seen without a doubt that the error of the sensor system is within 0.7°, which meets the application requirements.

[0051] In the sixth step above, if the Z-axis data is to be used, calibration is required. However, the Z-axis data cannot distinguish whether the steering wheel is turning left or right. When the vehicle is equipped with a gyroscope, the gyroscope has the ability to distinguish the direction of rotation. The gyroscope system can assist in distinguishing the direction, and the left and right steering data can also be obtained through the Z-axis data. However, there is an error accumulation problem in calculating the Euler angle through the gyroscope. Generally, the error will exceed the acceptable range after 1 minute. The Hall sensor measurement system mentioned above can just make up for this loophole, that is, when the steering wheel rotates to 0 o'clock, the error will accumulate. (Since the vehicle needs to maintain balance while riding, it will repeatedly pass through the 0 point) Reset the gyroscope vehicle system and set the current angle value to 0. In this way, the error of the gyroscope attitude solution system can always be kept within the control range; further, since the gyroscope's multi-sensor fusion system only needs the Hall sensor to provide a 0-point signal, the volume of the magnetic block can be reduced at this time, retaining only the 0-point area. There are also more options for magnetization methods. When the handlebar rotates to 0, an electrical signal is provided to reset the gyroscope attitude solution system, thereby ensuring that the error of the vehicle's attitude calculation is within the control range;

[0052] Furthermore, if it is necessary to obtain a signal indicating that the steering wheel has turned to 0 o'clock, the Hall sensor 8 can be replaced with a reflective infrared sensor. The installation position remains unchanged, and a reflective surface is designed at the 0 o'clock position on the bottom surface of the three-star column. When the steering wheel rotates to the 0 o'clock position, the infrared light emitted by the infrared sensor will be reflected back by the reflective surface, thereby triggering an electrical signal. After receiving the electrical signal, the vehicle computer system resets the gyroscope attitude solution system, thereby returning the accumulated error to 0; the reflective infrared sensor system does not require magnetic blocks as consumables, the system will be more stable and the cost will be lower, but it is necessary to ensure that when the steering wheel rotates, the reflection signal will not be triggered at non-0 point positions. This needs to be achieved by controlling the sensing distance and reflective material of the infrared sensor. For example, we can set a shorter distance at the 0 o'clock position and a longer distance at non-0 point positions, and make the infrared sensor only sense 0 point; we can also use more special reflective materials at the 0 o'clock position so that only the signal value at the 0 o'clock position meets the requirements, thereby realizing the function of triggering the reset system at 0 o'clock.

[0053] Example 2:

[0054] The difference between Example 2 and Example 1 is that in this embodiment, a magnetic block mounting bracket 5 is added to the periphery of the main pipe 3, and a magnetic block 6 is matched and installed within the magnetic block mounting bracket 5, and the magnetic block 6 is radially magnetized. A sensor bracket 4 is added to the connecting pipe 1 connected to the middle of the lower base plate of the three-star column 2. The bottom of the sensor bracket 4 is equipped with a Hall plate 7, and the bottom of the Hall plate 7 is installed with a Hall sensor 8. The Hall sensor 8 faces the magnetic block 6, and as the sensor bracket 4 rotates with the connecting pipe 1, the Hall sensor 8 always faces the magnetic block 6. The sensor bracket 4 rotates around the center of the connecting pipe 1 with the reference point. During the rotation of the sensor bracket 4, the Hall sensor 8 always faces the magnetic block 6.

[0055] Example 3:

[0056] The difference between Example 3 and Example 1 is that: a sensor bracket 4 is added to the connecting pipe 1 at the faucet on the upper part of the three-star column 2, a Hall plate 7 is assembled at the bottom of the sensor bracket 4, and a Hall sensor 8 is installed at the bottom of the Hall plate 7; a magnetic block mounting bracket 5 is added to the main pipe 3 fixedly connected to the vehicle frame, a magnetic block 6 is arranged in the magnetic block mounting bracket 5, and the magnetic block 6 is radially magnetized; when the faucet rotates, the sensor bracket 4 drives the Hall sensor 8 to rotate synchronously with the center of the connecting pipe 1 of the vehicle head as the reference, and the Hall sensor 8 is always facing the magnetic block 6 when rotating.

[0057] In this embodiment, there is a faucet mounting hole on the upper part of the three-star column. The rotation angle of the faucet has a high precision, and its precision is guaranteed by this mounting hole. This mounting hole plays a positioning role, ensuring that the rotation angle of the faucet to the left and to the right is consistent.

[0058] For example, the relative position of the faucet mounting hole is fixed at the factory, for example, facing straight ahead, and a sensor bracket 4 is fixed on the screw of the faucet mounting hole, the Hall sensor 8 is installed on this sensor bracket 4, and the magnetic block 6 is placed on the main pipe 3. In this way, when the faucet rotates, the Hall sensor 8 and the magnetic block 6 will be driven to move relative to each other.

[0059] Example 4:

[0060] The fourth embodiment differs from the first embodiment in that a Hall effect sensor 8 and a magnetic block 6 are respectively installed on the main pipe 3 and the connecting pipe 1; the Hall effect sensor 8 is placed parallel to the side of the magnetic block 6; when the steering wheel rotates, the Hall effect sensor 8 and the magnetic block 6 rotate relative to each other, and their relative positions change. The intensity of the magnetic field sensed by the Hall effect sensor 8 changes with the rotation angle.

[0061] Specifically, the Hall sensor 8 is placed parallel to the inner circle position of the side of the magnetic block 6. When the Hall sensor 8 and the magnet 6 rotate relative to each other, the shortest distance between the Hall sensor 8 and the magnetic block 6 remains unchanged, and the magnetization direction of the magnetic block 6 is the tangent direction of the center point of the magnetic block arc.

[0062] Embodiment 5:

[0063] The difference between Example 5 and Example 1 is that: a Hall sensor 8 and a magnetic block 6 are respectively installed on the main pipe 3 and the connecting pipe 1; the Hall sensor 8 is placed parallel to the side of the magnetic block 6; when the steering wheel rotates, the Hall sensor 8 and the magnetic block 6 rotate relative to each other, and their relative positions change. The strength of the magnetic field sensed by the Hall sensor 8 changes with the change of the rotation angle.

[0064] Specifically, the Hall sensor 8 is placed parallel to the outer circle position of the side of the magnetic block 6. When the Hall sensor 8 and the magnet 6 rotate relative to each other, the shortest distance between the Hall sensor 8 and the magnetic block 6 remains unchanged, and the magnetization direction of the magnetic block 6 is the tangent direction of the center point of the magnetic block arc.

[0065] The options of the Hall sensor 8 of the present invention include but are not limited to triaxial (XYZ), biaxial (XZ, XY, YZ), single-axis Hall sensing (X, Y, Z), unipolar (N|S) and bipolar (N&S);

[0066] The magnetic block 6 used in the present invention can be a bar-shaped magnetic block with an arc of 90° to 360°. When the arc is 360°, it is a circular magnetic block.

[0067] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments merely represent implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A device for measuring the rotation angle of a car steering wheel, characterized in that: include: A connecting pipe (1) connected to the three-star column (2) is provided with a main pipe (3) on the periphery of the connecting pipe (1). The connecting pipe (1) rotates synchronously with the swing of the handlebar. The main pipe (3) is fixedly connected to the vehicle frame. When the connecting pipe (1) rotates, the main pipe (3) remains stationary. A Hall sensor (8) and a magnetic block (6) are respectively installed on the main pipe (3) and the connecting pipe (1); When the steering wheel rotates, the relative position between the Hall sensor (8) and the magnetic block (6) changes, and the intensity of the magnetic field induced by the Hall sensor (8) changes as the rotation angle changes.

2. The steering wheel rotation angle measuring device according to claim 1, characterized in that: A fixed sensor bracket (4) is additionally provided on the periphery of the main pipe (3); a Hall plate (7) is mounted on the bottom of the sensor bracket (4); and a Hall sensor (8) is installed on the bottom of the Hall plate (7); A magnetic block mounting frame (5) is provided at a connection pipe (1) connected to the middle portion of the lower base plate of the three-star column (2), a magnetic block (6) is matched and provided in the magnetic block mounting frame (5), and the magnetic block (6) is radially magnetized; The Hall sensor (8) is directly opposite to the magnetic block (6), and when the magnetic block mounting frame (5) rotates along with the connecting pipe (1), the Hall sensor (8) is always opposite to the magnetic block (6).

3. The steering wheel rotation angle measuring device according to claim 2, characterized in that: The magnetic block mounting frame (5) is based on the center of the connecting pipe (1) and rotates around the center of the circle. During the rotation of the magnetic block mounting frame (5), the Hall sensor (8) is always facing the magnetic block (6).

4. The steering wheel rotation angle measuring device according to claim 1, characterized in that: A magnetic block mounting frame (5) is added to the periphery of the main pipe (3), and a magnetic block (6) is matched and arranged in the magnetic block mounting frame (5), and the magnetic block (6) is radially magnetized; A sensor bracket (4) is added to the connecting pipe (1) connected to the middle of the lower base plate of the three-star column (2), a Hall plate (7) is assembled at the bottom of the sensor bracket (4), and a Hall sensor (8) is installed at the bottom of the Hall plate (7); The Hall sensor (8) is directly opposite to the magnetic block (6), and when the sensor bracket (4) rotates along with the connecting pipe (1), the Hall sensor (8) is always opposite to the magnetic block (6).

5. The steering wheel rotation angle measuring device according to claim 4, characterized in that: The sensor bracket (4) rotates around the center of the connecting tube (1) with the center of the circle as a reference, and the Hall sensor (8) always faces the magnetic block (6) during the rotation of the sensor bracket (4).

6. The steering wheel rotation angle measuring device according to claim 1, characterized in that: A sensor bracket (4) is added to the connecting pipe (1) at the faucet of the upper part of the three-star column (2), a Hall plate (7) is assembled at the bottom of the sensor bracket (4), and a Hall sensor (8) is installed at the bottom of the Hall plate (7); A magnetic block mounting frame (5) is added to the main pipe (3) fixedly connected to the vehicle frame, a magnetic block (6) is arranged in the magnetic block mounting frame (5), and the magnetic block (6) is radially magnetized; When the steering wheel of the vehicle rotates, the sensor bracket (4) drives the Hall sensor (8) to rotate synchronously with the center of the connecting pipe (1) of the vehicle head as a reference, and the Hall sensor (8) always faces the magnetic block (6) when rotating.

7. The steering wheel rotation angle measuring device according to claim 1, characterized in that: A Hall sensor (8) and a magnetic block (6) are respectively installed on the main pipe (3) and the connecting pipe (1); the Hall sensor (8) is placed parallel to the side of the magnetic block (6); When the steering wheel rotates, the Hall sensor (8) and the magnetic block (6) rotate relative to each other, and their relative positions change. The intensity of the magnetic field induced by the Hall sensor (8) changes as the rotation angle changes.

8. The steering wheel rotation angle measuring device according to claim 7, characterized in that: The Hall sensor (8) is placed parallel to the inner circle of the side of the magnetic block (6).

9. The steering wheel rotation angle measuring device according to claim 7, characterized in that: The Hall sensor (8) is placed parallel to the outer circle of the side of the magnetic block (6).

10. The steering wheel rotation angle measuring device according to any one of claims 7 to 9, characterized in that: The magnetization direction of the magnetic block (6) is the tangent direction of the arc center point of the magnetic block.

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