Valve driving device and electronic valve

Abstract

The embodiment of the utility model relates to the technical field of automobile control valves, and discloses a valve driving device and an electronic valve.The valve driving device comprises a rotor, a circuit board, a first magnetic inductor and a second magnetic inductor, the circuit board is arranged on the outer side of the circumference of the rotor, and the rotor can rotate around the axis direction of the rotor relative to the circuit board; the first magnetic sensor is arranged on one side of the rotor and used for sensing the radial magnetic flux of the rotor, and the second magnetic sensor is arranged on one side of the rotor in the radial direction of the rotor and used for sensing the tangential magnetic flux of the rotor. In this way, according to the embodiment of the invention, the rotation angle of the rotor can be obtained through decoding calculation according to the radial magnetic flux signal and the tangential magnetic flux signal. Changes of different components of the same magnetic field are sensed through the first magnetic sensor and the second magnetic sensor, comprehensive assembly errors are effectively avoided, the orthogonality of two paths of sensing signals is improved, and the calculation precision of angle decoding is improved.

Description

Technical Field

[0001] This application relates to the field of control valve technology, and in particular to a valve drive device and an electronic valve. Background Technology

[0002] Electronic valves, such as electronic expansion valves and electronic water valves, are crucial components in automotive thermal management. These valves consist of a rotor, a valve core, and a Hall sensor. The rotor drives the valve core to rotate, and the Hall sensor detects the rotor's rotational position. Current electronic valve technologies typically use a single Hall sensor, which cannot identify the direction when the rotor is stalled, easily leading to misjudgments. While dual Hall sensors are arranged at an angle, they are highly susceptible to structural dimensional errors, easily causing overlap or even phase misalignment of the two sensor signals, resulting in stall misjudgments. Therefore, current electronic valves all suffer from the problem of not accurately feeding back the rotor's position. Utility Model Content

[0003] In view of the above problems, this application provides a valve driving device and an electronic valve, which solve the above problems.

[0004] According to one aspect of this application, a valve actuation device is provided, comprising a rotor having a rotation axis about which the rotor is rotatable; a first magnetic sensor along the radial direction of the rotor, the first magnetic sensor being disposed on one side of the rotor, the first magnetic sensor being used to sense radial magnetic flux of the rotor; and a second magnetic sensor along the radial direction of the rotor, the second magnetic sensor being disposed on one side of the rotor, the second magnetic sensor being used to sense tangential magnetic flux of the rotor; wherein the radial direction of the rotor is perpendicular to the rotation axis.

[0005] In one alternative, the magnetic sensing direction of the first magnetic sensor is parallel to the radial magnetic field direction of the rotor; and / or the magnetic sensing direction of the second magnetic sensor is parallel to the tangential magnetic field direction of the rotor.

[0006] In an alternative embodiment, the valve actuation device further includes a circuit board disposed on the outer periphery of the rotor, wherein the first magnetic sensor and the second magnetic sensor are respectively disposed on the circuit board.

[0007] In one alternative embodiment, along the axial direction of the rotor, the circuit board includes a first surface and a second surface disposed opposite to each other; a first magnetic sensor is disposed on the first surface, and a second magnetic sensor is disposed on the second surface; wherein the axial direction of the rotor is parallel to the rotation axis.

[0008] In one alternative approach, the positions of the first magnetic sensor and the second magnetic sensor at least partially coincide along the axial direction of the rotor.

[0009] In an alternative embodiment, the valve actuation device further includes an encapsulated plastic body, in which the first magnetic sensor and the second magnetic sensor are disposed.

[0010] In one alternative embodiment, the valve actuation device further includes a first amplifier and a second amplifier, the first amplifier and the second amplifier being disposed on the circuit board, the first amplifier being electrically connected to the first magnetic sensor, and the second amplifier being electrically connected to the second magnetic sensor.

[0011] In one alternative embodiment, the valve actuation device further includes a shielding plate disposed on one side of the circuit board along the rotor axis, and the first magnetic sensor and the second magnetic sensor are respectively disposed on one side of the shielding plate.

[0012] In an alternative embodiment, the valve actuation device further includes a housing, within which the rotor, the first magnetic sensor, and the second magnetic sensor are respectively disposed.

[0013] According to another aspect of this application, an electronic valve is provided, including a valve core and a valve actuation device as described above, wherein the rotor of the valve actuation device is connected to the valve core.

[0014] The beneficial effects of this application embodiment are as follows: This application embodiment includes a rotor, a first magnetic sensor, and a second magnetic sensor. The first magnetic sensor is used to sense the radial magnetic flux of the rotor, and the second magnetic sensor is used to sense the tangential magnetic flux of the rotor. The rotation angle of the rotor is calculated by decoding the radial and tangential magnetic flux signals. By sensing the changes of different components of the same magnetic field through the first and second magnetic sensors, the overall assembly error is effectively avoided, the orthogonality of the two sensing signals is improved, and the amplitude of the two sensing signals is adjusted by the first and second amplifiers, thereby improving the calculation accuracy and reliability of the angle decoding. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a partial structural cross-sectional view of the valve drive device of this application;

[0017] Figure 2 This is an exploded schematic diagram of the valve drive device structure of this application;

[0018] Figure 3This is a partial structural schematic diagram of the valve drive device of this application;

[0019] Figure 4 This is a partial structural schematic diagram of the valve drive device of this application;

[0020] Figure 5 This is a partial structural schematic diagram of the valve drive device of this application;

[0021] Figure 6 This is a schematic diagram of the magnetic field of the valve driving device of this application;

[0022] Figure 7 This is a partial structural schematic diagram of the valve drive device of this application;

[0023] Figure 8 This is a partial structural schematic diagram of the valve drive device of this application;

[0024] Figure 9 This is a schematic diagram showing the magnetic sensing directions of the first and second magnetic sensors.

[0025] Figure 10 This is the original output amplitude phase diagram of the valve drive device of this application;

[0026] Figure 11 This is a partial circuit diagram of the valve drive device of this application;

[0027] Figure 12 This is the phase diagram of the output amplitude of the valve drive device after adjustment in this application. Detailed Implementation

[0028] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0030] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0031] Please see Figures 1 to 3 The valve actuation device 1000 includes a rotor 10, a first magnetic sensor 30, and a second magnetic sensor 40. The rotor 10 has a rotation axis and can rotate about this axis. Along the radial direction X of the rotor, the first magnetic sensor 30 is disposed on one side of the rotor 10 and is used to sense the radial magnetic flux of the rotor 10. Along the radial direction X of the rotor, the second magnetic sensor 40 is disposed on one side of the rotor 10 and is used to sense the tangential magnetic flux of the rotor 10. The radial direction X of the rotor 10 is perpendicular to the rotation axis.

[0032] For the rotor 10 mentioned above, as Figure 4 and Figure 5 As shown, rotor 10 is a permanent magnet rotor, rotor 10 is radially magnetized, rotor 10 includes at least one pair of magnetic poles, each pair of magnetic poles includes an N pole and an S pole, and at least one pair of magnetic poles are arranged sequentially along the circumference of rotor 10.

[0033] Regarding the first magnetic sensor 30 and the second magnetic sensor 40 mentioned above, as Figure 4 and Figure 5 As shown, the first magnetic sensor 30 senses the radial magnetic flux of the rotor 10 and outputs a first signal, and the second magnetic sensor 40 senses the tangential magnetic flux of the rotor 10 and outputs a second signal. The rotation angle of the rotor 10 can be calculated based on the first signal and the second signal.

[0034] In some embodiments, the first signal is a sinusoidal voltage signal Vsin, the second signal is a cosine voltage signal Vcos, and the rotation angle θ of the rotor 10 is given by the formula:

[0035]

[0036] It should be noted that the radial magnetic flux of rotor 10 refers to the magnetic flux passing through the radial direction of rotor 10, and the tangential magnetic flux refers to the magnetic flux passing through the tangential direction of rotor 10.

[0037] In some embodiments, please refer to the following: Figures 3 to 6The magnetic sensing direction of the first magnetic sensor 30 is parallel to the radial X-field direction of the rotor 10, and perpendicular to the tangential T-field direction of the rotor 10. The first magnetic sensor 30 can sense the radial magnetic flux of the rotor 10. The magnetic sensing direction of the second magnetic sensor 40 is parallel to the tangential T-field direction of the rotor 10, and perpendicular to the radial magnetic field direction of the rotor 10. The second magnetic sensor 40 can sense the tangential magnetic flux of the rotor 10. It should be noted that the magnetic sensing direction of the magnetic sensor refers to the direction in which the magnetic sensor is most sensitive to changes in the magnetic field. This direction determines the location and manner in which the magnetic sensor can most effectively detect changes in the magnetic field.

[0038] It should be noted that: in this application, the rotor 10 has a sinusoidal magnetic field distributed around its circumference, and the types of the first magnetic sensor 30 and the second magnetic sensor 40 are not specifically limited. The first magnetic sensor 30 and the second magnetic sensor 40 can be one or two of magnetic effect sensors such as TMR, GMR, AMR, and HALL.

[0039] In some embodiments, please refer to the following: Figure 4 and Figure 5 The valve drive device also includes a circuit board 50, which is disposed on the outer periphery of the rotor 10. The first magnetic sensor 30 and the second magnetic sensor 40 are respectively disposed on the circuit board 50. The circuit board 50 can be used to detect and process the signals output by the first magnetic sensor 30 and the second magnetic sensor 40.

[0040] In some embodiments, along the axial direction Z of the rotor 10, the circuit board 50 includes a first surface 50a and a second surface 50b, a first magnetic sensor 30 is disposed on the first surface 50a, and a second magnetic sensor 40 is disposed on the second surface 50b. The axial direction Z of the rotor 10 is parallel to the rotation axis of the rotor 10.

[0041] In some embodiments, along the axial direction Z of the rotor 10, the positions of the first magnetic sensor 30 and the second magnetic sensor 40 at least partially coincide, to ensure that the first magnetic sensor 30 and the second magnetic sensor 40 are located at the same polar angle position on the circuit board 50. Here, "same polar angle position" refers to the same angle in polar coordinates, meaning that the first magnetic sensor 30 and the second magnetic sensor 40 should be located at the same angle in polar coordinates on the circuit board 50.

[0042] It is understood that in some other embodiments, the first magnetic sensor 30 and the second magnetic sensor 40 may be located simultaneously on the first surface 50a or simultaneously on the second surface 50b. Furthermore, the positions of the first magnetic sensor 30 and the second magnetic sensor 40 may not coincide along the axial direction Z of the rotor 10, as long as the first magnetic sensor 30 and the second magnetic sensor 40 are located at the same polar angle.

[0043] In some embodiments, please refer to the following: Figure 7 and Figure 8 The valve actuation device also includes a shielding plate 60, which is disposed on one side of the circuit board 50 along the rotor axis. The first magnetic sensor 30 and the second magnetic sensor 40 are both disposed on one side of the shielding plate 60, thereby preventing external magnetic fields from interfering with the first magnetic sensor 30 and the second magnetic sensor 40, ensuring that the first magnetic sensor 30 and the second magnetic sensor 40 output signals normally. The shielding plate 60 is spaced apart from the circuit board 50 so that the first magnetic sensor 30 and the second magnetic sensor 40 are located on the same side of the shielding plate 60. Along the axial direction Z of the rotor 10, the projection of the shielding plate 60 onto the circuit board 50 covers the first magnetic sensor 30 and the second magnetic sensor 40, thus allowing the shielding plate 60 to shield interference signals from one side of the circuit board 50.

[0044] In some embodiments, please refer to the following: Figure 1 and Figure 2 The valve drive device also includes a housing 70, and the rotor 10, circuit board 50, first magnetic sensor 30 and second magnetic sensor 40 are all disposed inside the housing 70.

[0045] In some embodiments, the housing 70 further includes an upper housing 701 and a lower housing 702, which are detachably connected and enclose a receiving cavity 70a, in which the rotor 10, circuit board 50, first magnetic sensor 30 and second magnetic sensor 40 are all located within the receiving cavity 70a.

[0046] In some embodiments, please refer to the following: Figures 7 to 9 The valve actuation device also includes a packaged plastic body 80, within which a first magnetic sensor 30 and a second magnetic sensor 40 are disposed. The first magnetic sensor 30 and the second magnetic sensor 40 are packaged together within the same plastic body in a direction perpendicular to each other's magnetic sensitivity directions, forming an integrated chip. This ensures the mounting accuracy of the first magnetic sensor 30 and the second magnetic sensor 40 and reduces the mounting volume. The magnetic sensitivity direction of the first magnetic sensor 30 is a horizontal arrow, and the magnetic sensitivity direction of the second magnetic sensor 40 is a vertical arrow. It is understood that the magnetic sensitivity directions of the first magnetic sensor 30 and the second magnetic sensor 40 can be interchanged according to actual needs.

[0047] In some embodiments, please refer to the following: Figure 1 and Figure 2The valve driving device also includes a driving mechanism 90, which is connected to the rotor 10 and can drive the rotor 10 to rotate relative to the housing 70. The driving mechanism 90 includes a driving motor 901 and a transmission assembly 902, which are respectively disposed inside the housing. The driving motor 901 is connected to the transmission assembly 902, and the transmission assembly 902 is connected to the rotor 10. The driving motor 901 can drive the rotor 10 to rotate through the transmission assembly 902.

[0048] Figure 10 The diagram shows the original output amplitude and phase of the first magnetic sensor 30 and the second magnetic sensor 40. Figure 11 This is a circuit diagram showing the connection between the first magnetic sensor 30, the second magnetic sensor 40, and the operational amplifier. Figure 12 The output amplitude and phase diagram of the first magnetic sensor 30 and the second magnetic sensor 40 after adjustment by the operational amplifier is shown. Under the action of the operational amplifier, the output amplitudes of the first magnetic sensor 30 and the second magnetic sensor 40 are made to be consistent.

[0049] In some embodiments, please refer to the following: Figure 11 and Figure 12 The circuit board 50 is equipped with a first amplifier 31 and a second amplifier 41. The first amplifier 31 is electrically connected to a first magnetic sensor 30, and the second amplifier 41 is electrically connected to a second magnetic sensor 40. The first magnetic sensor 30, connected to the first amplifier 31, outputs a first amplitude, and the second magnetic sensor 40, connected to the second amplifier 41, outputs a second amplitude, which is equal to the first amplitude. The first amplifier 31 and the second amplifier 41 have adjustable gains. When the rotor 10 rotates, the gain parameters are adjusted so that the output amplitudes of the first magnetic sensor 30 and the second magnetic sensor 40 are consistent.

[0050] It should be noted that when a magnetic sensor is connected to an amplifier, the amplifier can amplify the weak signal detected by the magnetic sensor and output a signal with a higher amplitude. The first amplitude refers to the output amplitude of the first magnetic sensor 30 after being amplified by the first amplifier 31, and the second amplitude refers to the output amplitude of the second magnetic sensor 40 after being amplified by the second amplifier 41. The output amplitude is the product of the input signal amplitude and the gain. By selecting an appropriate feedback resistor, the amplifier gain can be set, thereby determining the output amplitude. The aforementioned input signal amplitude refers to the output signal amplitude of the magnetic sensor.

[0051] It should be noted that, since the rotor 10 is in the same position, the peak values ​​of the radial and tangential magnetic flux densities are inconsistent. In the quadrature voltage signal output mode, the amplitude variation will cause a significant deviation in the positions of the magnetic field operating point BOP and magnetic field release point BRP of the first magnetic sensor 30 and the second magnetic sensor 40, resulting in non-orthogonal signal phases. In the arctangent angle calculation mode, the amplitude variation will lead to a decrease in the accuracy of the calculated output angle. Therefore, when the rotor 10 is rotating, it is necessary to adjust the gain of the first magnetic sensor 30 or the second magnetic sensor 40 to make the peak values ​​of the two channels consistent.

[0052] In some embodiments, the pole diameter of the first magnetic sensor 30 is ρ1 and the pole diameter of the second magnetic sensor 40 is ρ2. When the magnetic sensors are connected to an amplifier with a fixed gain, the output amplitudes of the first magnetic sensor 30 and the second magnetic sensor 40 can be made consistent by adjusting the relative positions of ρ1 and ρ2.

[0053] In some embodiments, a signal conversion module (not shown) is provided on the circuit board 50. The signal conversion module is connected to the first magnetic sensor 30 and the second magnetic sensor 40. The signal conversion module converts the input signal of the first magnetic sensor 30 into a first signal and the input signal of the second magnetic sensor 40 into a second signal. The signal conversion module can convert the analog signals in the first magnetic sensor 30 and the second magnetic sensor 40 into corresponding digital signals for output. In some embodiments, the signal conversion module is an analog-to-digital signal converter.

[0054] In some embodiments, please refer to the following: Figure 1 and Figure 2 The circuit board 50 is equipped with a microcontroller unit 501. The microcontroller unit 501 performs analog-to-digital conversion based on the first amplitude and the second amplitude output by the first amplifier 31 and the second amplifier 41, and calculates the output angle signal.

[0055] In this embodiment, a rotor 10, a first magnetic sensor 30, and a second magnetic sensor 40 are provided. The first magnetic sensor 30 is used to sense the radial magnetic flux of the rotor 10, and the second magnetic sensor 40 is used to sense the tangential magnetic flux of the rotor 10. The rotation angle of the rotor 10 is calculated based on the radial and tangential magnetic flux signals. By sensing the changes of different components of the same magnetic field through the first magnetic sensor 30 and the second magnetic sensor 40, the overall assembly error is effectively avoided, the orthogonality of the two sensing signals is improved, and the amplitude of the two sensing signals is adjusted through the first amplifier 31 and the second amplifier 41, thereby improving the calculation accuracy and reliability of angle decoding.

[0056] This application also provides an embodiment of an electronic valve, which includes a valve core and a valve drive device 1000 as described above. The rotor 10 of the valve drive device is connected to the valve core, and the rotor 10 can drive the valve core to rotate, thereby controlling the opening degree of the electronic valve. The function and structure of the valve drive device can be found in the above embodiments, and will not be described in detail here.

[0057] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A valve driving device, characterized in that, include: The rotor is provided with a rotation axis and can rotate around the rotation axis; A first magnetic sensor is disposed on one side of the rotor along the radial direction of the rotor, and the first magnetic sensor is used to sense the radial magnetic flux of the rotor. A second magnetic sensor is disposed on one side of the rotor along the radial direction of the rotor, and the second magnetic sensor is used to sense the tangential magnetic flux of the rotor. The radial direction of the rotor is perpendicular to the axis of rotation.

2. The valve driving device according to claim 1, characterized in that, The magnetic sensing direction of the first magnetic sensor is parallel to the radial magnetic field direction of the rotor; and / or The magnetic sensing direction of the second magnetic sensor is parallel to the tangential magnetic field direction of the rotor.

3. The valve driving device according to claim 1, characterized in that, The valve driving device also includes a circuit board, which is disposed on the outer periphery of the rotor, and the first magnetic sensor and the second magnetic sensor are respectively disposed on the circuit board.

4. The valve driving device according to claim 3, characterized in that, Along the axial direction of the rotor, the circuit board includes a first surface and a second surface disposed opposite to each other; The first magnetic sensor is disposed on the first surface, and the second magnetic sensor is disposed on the second surface; The rotor's axial direction is parallel to the rotation axis.

5. The valve driving device according to claim 4, characterized in that, Along the axial direction of the rotor, the positions of the first magnetic sensor and the second magnetic sensor at least partially coincide.

6. The valve driving device according to claim 1, characterized in that, The valve actuation device further includes a plastic encapsulation body, in which the first magnetic sensor and the second magnetic sensor are disposed.

7. The valve actuation device according to any one of claims 3-5, characterized in that, The valve driving device further includes a first amplifier and a second amplifier, which are disposed on the circuit board. The first amplifier is electrically connected to the first magnetic sensor, and the second amplifier is electrically connected to the second magnetic sensor.

8. The valve actuation device according to any one of claims 3-5, characterized in that, The valve driving device further includes a shielding plate, which is disposed on one side of the circuit board along the rotor axis, and the first magnetic sensor and the second magnetic sensor are respectively disposed on one side of the shielding plate.

9. The valve driving device according to claim 1, characterized in that, The valve driving device also includes a housing, and the rotor, the first magnetic sensor and the second magnetic sensor are respectively disposed inside the housing.

10. An electronic valve, characterized in that, include: Valve core; The valve drive device according to any one of claims 1-9, wherein the rotor of the valve drive device is connected to the valve core.

Images