CN114545982A - Angle sensing device - Google Patents
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- CN114545982A CN114545982A CN202011345607.5A CN202011345607A CN114545982A CN 114545982 A CN114545982 A CN 114545982A CN 202011345607 A CN202011345607 A CN 202011345607A CN 114545982 A CN114545982 A CN 114545982A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D3/10—Control of position or direction without using feedback
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Abstract
An angle sensing device comprises a shell, a linkage gear, a first gear set, a second gear set, a magnetic element, an angle sensing unit and a processing unit. The linkage gear is pivotally arranged on the shell and is used for being coupled with a steering column of a mobile carrier. The first gear set is meshed with the linkage gear and is used for converting the rotation angle of the linkage gear into a comparison angle within a range of 360 degrees in an equal proportion mode. The second gear set is connected with the first gear set. The magnetic element is fixed on the second gear set. The angle sensing unit is used for sensing a magnetic field change value generated by the rotation of the magnetic element. The processing unit is electrically connected with the angle sensing unit and used for comparing the absolute angle of the steering column according to the magnetic field change value generated by the magnetic element. Through the above framework, the invention not only reduces the cost of resources, time and manpower, but also overcomes the problems and disadvantages caused by complex structure and large volume.
Description
Technical Field
The present invention relates to an angle sensing device, and more particularly, to an angle sensing device for a mobile carrier.
Background
Under the condition of increasingly advanced technology, most steering systems of the existing power vehicles are provided with power steering wheels, so that drivers can easily control the steering wheels. Currently, most power steering wheels are matched with a plurality of (for example, two) angle sensors to sense the operation of a driver, one of the angle sensors is used for measuring the rotation angle of a rotating member of the steering wheel, the other angle sensor is used for determining the coarser rotation number of the rotating member, and then the overall angle information of the rotating member is obtained through the matching calculation of the two sets of angle information. For example, both of the aforementioned US9097559 and JP2004184264 describe that at least two sets of angle detectors are required, and two sets of information are combined to calculate the angle information of the steering wheel rotating member.
However, the steering system using two sets of angle detectors will increase the resource, time and labor costs, and is accompanied by the problems and disadvantages of complex structure and large volume.
Disclosure of Invention
An object of the present invention is to provide an angle sensing device to solve the above mentioned difficulties in the prior art.
An embodiment of the present invention provides an angle sensing device. The angle sensing device comprises a shell, a linkage gear, a first gear set, a second gear set, a magnetic element, an angle sensing unit and a processing unit. The linkage gear is pivotally arranged on the shell and is used for being coupled with a steering column of a mobile carrier. The first gear set is meshed with the linkage gear and is used for converting the rotation angle of the linkage gear into a comparison angle within a range of 360 degrees in an equal proportion mode. The second gear set is connected with the first gear set and used for rotating the comparison angle along with the first gear set. The magnetic element is fixed on the second gear set. The angle sensing unit is arranged opposite to the linkage gear, keeps a gap with the magnetic element and is used for sensing a magnetic field change value generated by the rotation of the magnetic element. The processing unit is electrically connected with the angle sensing unit and used for comparing the absolute angle of the steering column according to the magnetic field change value generated by the magnetic element.
According to one or more embodiments of the present invention, in the angle sensing device, the second gear set includes a gear body and a magnet holder. The magnet seat is positioned on one surface of the gear body and protrudes towards the angle sensing unit. One end of the magnet seat is formed with a containing groove which is used for containing the magnetic element in a matching way.
According to one or more embodiments of the present invention, in the angle sensing apparatus, the housing includes a top cover and a bottom cover. The bottom cover and the top cover are combined with each other. One side of the bottom cover facing the top cover is provided with a concave part, and the linkage gear and the first gear set are respectively positioned in the concave part.
According to one or more embodiments of the present invention, in the angle sensing device, the first gear set includes a first speed reduction gear portion, a second speed reduction gear portion and a third speed reduction gear portion. The first speed reduction gear part is pivoted on the shell and meshed with the linkage gear to reduce the rotating speed of the linkage gear. The second speed reduction gear part is pivoted on the shell and meshed with the first speed reduction gear part to reduce the rotating speed of the first speed reduction gear part. The third speed reduction gear part is coaxially pivoted on the first speed reduction gear part and is meshed with the second speed reduction gear part and the second gear set so as to reduce the rotating speed of the second speed reduction gear part and synchronously rotate the magnetic element.
According to one or more embodiments of the present invention, in the angle sensing apparatus, the first reduction gear portion includes a first pivot, a first gearwheel and a first pinion. The first gearwheel is pivoted on the shell through a first pivot, is meshed with the linkage gear and is positioned at the same level height with the linkage gear. The first small gear is coaxially and fixedly connected to one surface, opposite to the shell, of the first large gear through a first pivot. The number of teeth of the first large gear is larger than that of the first small gear.
According to one or more embodiments of the present invention, in the angle sensing apparatus, the second reduction gear portion includes a second pivot, a second gearwheel and a second pinion. The second gearwheel is pivoted to the shell through a second pivot, is engaged with the first pinion and is positioned at the same level height with the first pinion. The second small gear is coaxially and fixedly connected to the second big gear relative shell through a second pivot. The number of teeth of the second gearwheel is greater than that of the second pinion, and the second gearwheel group is coaxially pivoted to one surface of the second pinion, which is opposite to the shell, through a second pivot.
According to one or more embodiments of the present invention, in the angle sensing apparatus, the third reduction gear portion includes a third large gear and a third small gear. The third gearwheel is coaxially pivoted to one surface of the first pinion opposite to the first gearwheel through a first pivot, is meshed with the second pinion and is positioned at the same level height with the second pinion. The third pinion is coaxially and fixedly connected to the third gearwheel opposite shell through a first pivot, is meshed with the second gearwheel group, is positioned at the same level height with the second gearwheel group, and has a larger number of teeth than the third pinion.
According to one or more embodiments of the present invention, in the angle sensing device, the first gear set includes a first speed reduction gear portion, a second speed reduction gear portion and a third speed reduction gear portion. The first speed reduction gear part is pivoted on the shell through a first pivot and is meshed with the linkage gear to reduce the rotating speed of the linkage gear. The second speed reduction gear part is pivoted on the shell through a second pivot and is meshed with the first speed reduction gear part to reduce the rotating speed of the first speed reduction gear part. The third speed reduction gear part is pivoted on the shell through a third pivot and is meshed with the second gear set to reduce the rotating speed of the second speed reduction gear part and synchronously rotate the magnetic element. The second gear set is pivoted on the shell through a fourth pivot, and the first pivot, the second pivot, the third pivot and the fourth pivot are parallel to each other.
According to one or more embodiments of the present invention, in the angle sensing apparatus, the first reduction gear portion includes a first large gear and a first small gear. The first gearwheel is pivoted on the shell through a first pivot, is meshed with the linkage gear and is positioned at the same level height with the linkage gear. The first pinion is coaxially and fixedly connected to one surface, opposite to the shell, of the first big gear through the first pivot, and the number of teeth of the first big gear is larger than that of the first pinion.
According to one or more embodiments of the present invention, in the angle sensing apparatus, the second reduction gear portion includes a second large gear and a second small gear. The second gearwheel is pivoted to the shell through a second pivot, is meshed with the first pinion and is positioned at the same level height with the first pinion. The second pinion is coaxially and fixedly connected to one surface of the second bull gear, which is opposite to the shell, through a second pivot, wherein the number of teeth of the second bull gear is greater than that of the second pinion.
According to one or more embodiments of the present invention, in the angle sensing apparatus, the third reduction gear portion includes a third large gear and a third small gear. The third gearwheel is coaxially pivoted to the shell through a third pivot, meshed with the second pinion and positioned at the same level height with the second pinion. The third pinion is coaxially and fixedly connected to one surface of the third bull gear, which is opposite to the shell, through a third pivot, is meshed with the second gear set, and is positioned at the same level height with the second gear set. The number of teeth of the third gearwheel is greater than that of the third pinion.
According to one or more embodiments of the present invention, in the angle sensing device, the angle sensing unit includes a wiring board, a first magnetic sensing element and a second magnetic sensing element. The first magnetic sensing element and the second magnetic sensing element are respectively positioned on two opposite sides of the wiring board, and the sensing signal of the first magnetic sensing element is complementary to the sensing signal of the second magnetic sensing element. The second magnetic sensing element is positioned between the first magnetic sensing element and the magnetic element.
According to one or more embodiments of the present invention, in the angle sensing apparatus, the processing unit divides a maximum rotation angle at which the steering column can rotate by a total resolution of the angle sensing unit to obtain a unit resolution, and compares an absolute angle of the steering column according to a magnetic field variation value induced by the angle sensing unit to the rotation of the magnetic element.
Thus, through the architecture of the above embodiments, the present invention not only reduces the resource, time and labor costs, but also overcomes the problems and disadvantages caused by the complicated structure and the large volume.
The foregoing is merely illustrative of the problems to be solved, solutions to problems, and effects produced by the present invention, and specific details thereof are set forth in the following description and the related drawings.
Drawings
In order to make the aforementioned and other objects, features, and advantages of the invention, as well as others which will become apparent, reference is made to the following description taken in conjunction with the accompanying drawings in which:
FIG. 1 is an exploded view of an angle sensor according to an embodiment of the present invention;
FIG. 2 is a perspective view of the angle sensor of FIG. 1;
fig. 3A and 3B are schematic diagrams illustrating a comparison between a comparison angle and an absolute angle of the angle sensing apparatus of fig. 1;
FIG. 4 is a top view of an angle sensor according to an embodiment of the invention; and
fig. 5 is a schematic diagram illustrating an angle sensing unit according to an embodiment of the invention.
[ notation ] to show
10. 11: angle sensing device
100 casing
110 top cover
120: bottom cover
121: recessed part
122 opening (c)
200 linkage gear
210 gear body
220 through hole
221 inner wall
230 coupling part
300 first gear set
310 first speed reduction gear portion
311 first pivot
312 the first gearwheel
313 first pinion
320 second reduction gear part
321 the second pivot
322 the second gearwheel
323 second pinion
330 third reduction gear part
331: third pivot
332 the third gearwheel
333 third pinion gear
340 second gear set
341 gear body
342 magnet seat
343 accommodating groove
344 fourth pivot
345 in the axial direction
400 magnetic element
500. 501 angle sensing unit
510 wiring board
520 first magnetic sensing element
530 second magnetic sensing element
600 processing unit
A. B voltage value
Detailed Description
In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that these implementation details are not required in some embodiments of the invention and are not to be construed as limiting the invention. In addition, for the sake of simplicity, some conventional structures and elements are shown in the drawings in a simple schematic manner. In addition, the dimensions of the various elements in the drawings are not necessarily to scale, for the convenience of the reader.
Fig. 1 is an exploded view of an angle sensor 10 according to an embodiment of the invention. Fig. 2 is a perspective view of the angle sensor 10 of fig. 1 showing a top cover 110. As shown in fig. 1 and 2, the angle sensing device 10 is provided. The angle sensing device 10 includes a housing 100, a linkage gear 200, a first gear set 300, a second gear set 340, a magnetic element 400, an angle sensing unit 500 and a processing unit 600. The linking gear 200 is pivotally disposed on the housing 100, and is hollow for coupling with a steering column (not shown) of a steering wheel of a mobile vehicle. The mobile vehicle is, for example, a motor vehicle or a forklift, however, the present invention is not limited to the type of the mobile vehicle. The first gear set 300 is engaged with the interlocking gear 200 to proportionally convert the rotation angle of the interlocking gear 200 into a comparison angle within a range of 360 °. The second gear set 340 is connected to the first gear set 300 for rotating the comparison angle with the first gear set 300. The magnetic element 400 is fixed on the second gear set 340 and faces the angle sensing unit 500, and in the present embodiment, the magnetic field direction of the magnetic element 400 is parallel to the magnetic field direction of the first magnetic sensing element 520 and the magnetic field direction of the second magnetic sensing element 520. The angle sensing unit 500 is disposed opposite to the linking gear 200 and keeps a gap with the magnetic element 400 for sensing a magnetic field variation value generated by the rotation of the magnetic element 400. The processing unit 600 is electrically connected to the angle sensing unit 500 for comparing the absolute angle of the steering column according to the magnetic field variation value generated by the magnetic element 400.
As shown in fig. 1 and fig. 2, in the present embodiment, the housing 100 includes a top cover 110 and a bottom cover 120. The bottom cover 120 and the top cover 110 are combined with each other, so that the linkage gear 200, the first gear set 300, the second gear set 340, the magnetic element 400, the angle sensing unit 500 and the processing unit 600 can be fixed between the bottom cover 120 and the top cover 110. More specifically, the bottom cover 120 includes a recess 121 and an opening 122. A recess 121 is formed at a side of the bottom cover 120 facing the top cover 110. The opening 122 is formed at the bottom of the recess 121 and penetrates the bottom cover 120 from the bottom of the recess 121. The recess 121 can accommodate the interlocking gear 200 and the first gear set 300.
In the present embodiment, the linking gear 200 has a gear body 210, a through opening 220 and a plurality of coupling portions 230. The through hole 220 penetrates the gear body 210 and is connected to two opposite surfaces of the gear body 210. The coupling portions 230 are formed at intervals on the inner wall 221 of the gear body 210 facing the through opening 220. Thus, the steering column of the mobile carrier can extend into the through hole 220 and be engaged with the coupling portion 230 to drive the linkage gear 200 to rotate in the recess 121.
The first gear set 300 includes a first speed reduction gear portion 310, a second speed reduction gear portion 320 and a third speed reduction gear portion 330. The first speed reduction gear portion 310 is pivoted on the housing 100 and engaged with the linkage gear 200 for reducing the rotation speed of the linkage gear 200. More specifically, the first reduction gear portion 310 includes a first pivot 311, a first large gear 312 and a first small gear 313. The first large gear 312 is pivoted in the recess 121 of the bottom cover 120 through the first pivot 311, engages with the linking gear 200, and is located at the same level as the linking gear 200. The first small gear 313 is coaxially fixed to a surface of the first large gear 312 opposite to the bottom cover 120 through the first pivot 311, and the number of teeth of the first large gear 312 is greater than that of the first small gear 313. In other words, the first small gear 313 is fixed to the first large gear 312 via the first pivot 311, so that the first small gear 313 and the first large gear 312 move synchronously.
The second reduction gear portion 320 is pivoted on the housing 100 and engaged with the first reduction gear portion 310 to reduce the rotation speed of the first reduction gear portion 310. More specifically, the second reduction gear portion 320 includes a second pivot 321, a second large gear 322 and a second small gear 323. The first pivot 311, the second pivot 321 and the steering column (not shown) are parallel to each other. The second large gear 322 is pivotally connected to the recess 121 of the bottom cover 120 through a second pivot 321, engages with the first small gear 313, and is located at the same level as the first small gear 313. The second small gear 323 is coaxially fixed to a surface of the second large gear 322 opposite to the bottom cover 120 through the second pivot 321, in other words, the second small gear 323 is fixed to the second large gear 322 through the second pivot 321, so that the second small gear 323 and the second large gear 322 move synchronously. The number of teeth of the second large gear 322 is greater than that of the second small gear 323, and the second gear set 340 is coaxially pivoted to one surface of the second small gear 323 opposite to the bottom cover 120 through the second pivot 321, in other words, the second gear set 340 and the second reduction gear 320 share an axis, the second gear set 340 can rotate around the second pivot 321 opposite to the second reduction gear 320, and the second gear set 340 and the second reduction gear 320 can rotate independently without interfering with each other.
The third reduction gear 330 is coaxially pivoted to the first reduction gear 310, and is engaged with the second reduction gear 320 and the second gear set 340 to reduce the rotation speed of the second reduction gear 320 and synchronously rotate the magnetic element 400. In other words, the first reduction gear portion 310 and the third reduction gear portion 330 share the axle center, the third reduction gear portion 330 can rotate relative to the first reduction gear portion 310 around the first pivot 311, and the first reduction gear portion 310 and the third reduction gear portion 330 can rotate independently without interference.
More specifically, the third reduction gear portion 330 includes a third large gear 332 and a third small gear 333. The third gearwheel 332 is coaxially pivoted to a surface of the first pinion 313 opposite to the first gearwheel 312 through the first pivot 311, engages with the second pinion 323, and is located at the same level as the second pinion 323. The number of teeth of the third large gear 332 is greater than that of the third small gear 333, and the third small gear 333 is coaxially and fixedly connected to one surface of the third large gear 332 opposite to the bottom cover 120 through the first pivot 311, and is engaged with the second gear set 340, and is located at the same level height as the second gear set 340. In other words, the third small gear 333 is fixed to the third large gear 332 via the first pivot 311, so that the third small gear 333 and the third large gear 332 move simultaneously. Therefore, the interlocking gear 200, the first pinion gear 313, the second pinion gear 323, the third pinion gear 333, and the magnetic element 400 are at different step heights.
In this way, since the first, second and third reduction gear parts 310, 320 and 330 of the first gear set 300 are arranged to have an appropriate reduction gear ratio, the rotation angle of the second gear set 340 can be converted in equal proportion to the reduction speed to be within the range of 360 ° through the appropriate reduction gear ratio.
It should be appreciated that, since the first speed reduction gear portion 310 and the third speed reduction gear portion 330 having a common axis (i.e. the first pivot 311) are overlapped with each other, and the second speed reduction gear portion 320 and the second gear set 340 having a common axis (i.e. the second pivot 321) are overlapped with each other, the angle sensing device 10 of the present embodiment can obtain an advantage of being reduced in size.
In addition, the second gear set 340 includes a gear body 341 and a magnet holder 342. The magnet holder 342 is located on one surface of the gear body 341 and protrudes toward the angle sensing unit 500. An accommodating groove 343 is formed at one end of the magnet holder 342, the accommodating groove 343 is configured to accommodate the magnetic element 400 in a matching manner, and the axial direction 345 of the magnet holder 342 shares the same axis with the reference point of the first magnetic sensing element 520. The gear body 341 is coaxially pivoted to a surface of the second small gear 323 opposite to the second large gear 322 via the first pivot 311. The second reduction gear portion 320 and the second gear group 340 are rotatable, respectively, without interfering with each other.
Furthermore, the angle sensing unit 500 is disposed on the inner wall of the top cover 110, and the angle sensing unit 500 includes a wiring board 510 and a first magnetic sensing element 520. The wiring board 510 includes two faces opposing each other. The first magnetic sensing element 520 is soldered to one surface of the wiring board 510, faces the magnetic element 400, and aligns the magnetic element 400 in a non-contact manner. For example, but not limited thereto, the orthographic projection of the axis of the magnetic element 400 overlaps the orthographic projection of the sensing reference point of the first magnetic sensing element 520 and the second magnetic sensing element 530).
When designing a product, a designer divides the maximum rotation angle at which the steering column can rotate by the total resolution of the angle sensing unit 500 to obtain a unit resolution, that is, divides 360 ° into the number of degrees of the total resolution longitude to obtain the unit resolution longitude. Thus, when the driver rotates the steering column through the steering wheel to a rotation angle, and the first gear set 300 reduces the rotation angle proportionally to a comparison angle, that is, when the magnetic element 400 rotates relative to the angle sensing unit 500 by the comparison angle, the angle sensing unit 500 senses a magnetic field variation value (e.g., a voltage value) generated by the rotation of the magnetic element 400, so that the processing unit 600 compares the absolute angle of the steering column according to the magnetic field variation value (e.g., the voltage value).
Fig. 3A and 3B are schematic diagrams illustrating a comparison between a comparison angle and an absolute angle of the angle sensing apparatus of fig. 1. In the present embodiment, since the steering column of the mobile vehicle is turned left and right by about 2.5 turns, the maximum rotation angle at which the steering column can rotate is 0 ° to 1800 °, as shown in fig. 3A. Since the resolution of the angle sensing unit 500 is 12 bits (bit) and the total resolution longitude of the angle sensing unit 500 is 4096 (i.e., 2^12), the designer first divides 1800 into 4096 degrees, i.e., the horizontal axis of FIG. 3A is 4096 scales. Next, 4096 scales are respectively mapped one by one to different voltage values within the range of voltage values a to B of fig. 3A (fig. 3A). Next, as shown in FIG. 3B, the designer instead divides 360 into 4096 degrees and follows the voltage values corresponding to each of the 4096 scales of FIG. 3A.
Thus, for example, in the present embodiment, the basic resolution of the angle sensing device 10 is 0.439 ° (i.e., 1800/4096). Therefore, as shown in fig. 3A and 3B, the processing unit 600 (fig. 2) can compare the absolute angle of the corresponding steering column (fig. 3A) in equal proportion from any one of different angles of 4096 steps within the range of voltage values a to B.
However, the invention is not limited thereto, and in other embodiments, the resolution of the angle sensing unit 500 may be larger than 12 bits.
For example, when the driver sits the mobile vehicle in the straight driving direction on a flat road and the driver operates the steering wheel with hands, the mobile vehicle generally has a deflection of about 2 ° during the flat driving, however, since the angle resolution of the steering column measured by the angle sensing device of this embodiment is 0.439 ° and is much smaller than the deflection of 2 ° of the steering wheel during the straight driving on a flat road, the angle sensing device representing this embodiment has a resolution higher than the actual requirement, and can perform very precise angle measurement.
It should be understood that, since the absolute angle of rotation of the steering column can be obtained by only one angle sensing unit, the present embodiment does not need to arrange an additional angle sensor beside the linkage gear of the steering column, and does not need to collect the number of rotation turns of the steering column.
Fig. 4 is a top view of the angle sensor 11 according to an embodiment of the invention. As shown in fig. 4, the angle sensing device 11 of this embodiment is substantially the same as the angle sensing device 10 of fig. 1, except that the first gear set 300 includes a first speed reduction gear portion 310, a second speed reduction gear portion 320 and a third speed reduction gear portion 330. The first speed reduction gear portion 310 is pivoted on the housing 100 through a first pivot 311, and engages with the linkage gear 200 to reduce the rotation speed of the linkage gear 200. The second reduction gear 320 is pivoted on the housing 100 through a second pivot 321, and engages with the first reduction gear 310 to reduce the rotation speed of the first reduction gear 310. The third reduction gear 330 is pivoted to the housing 100 through a third pivot 331, and engages with the second gear set 340 to reduce the rotation speed of the second reduction gear 320 and synchronously rotate the magnetic element 400. The second gear set 340 is pivotally disposed on the housing 100 through a fourth pivot 344, and the first pivot 311, the second pivot 321, the third pivot 331, the fourth pivot 344 and the steering column (not shown) are parallel to each other. In this way, the magnetic element 400 can be converted into a matching angle within 360 ° by sequentially reducing the rotation speed of the interlocking gear 200 through the first reduction gear portion 310, the second reduction gear portion 320, and the third reduction gear portion 330.
More specifically, the first reduction gear portion 310 includes a first large gear 312 and a first small gear 313. The first large gear 312 is pivoted on the casing 100 through the first pivot 311, engages with the linking gear 200, and is located at the same level as the linking gear 200. The first small gear 313 is coaxially fixed to a surface of the first large gear 312 opposite to the housing 100 through the first pivot 311, and the number of teeth of the first large gear 312 is greater than that of the first small gear 313, in other words, the first small gear 313 is fixed to the first large gear 312 through the first pivot 311, so that the first small gear 313 and the first large gear 312 move synchronously.
The second reduction gear portion 320 includes a second large gear 322 and a second small gear 323. The second large gear 322 is pivotally connected to the housing 100 through a second pivot 321, engages with the first small gear 313, and is located at the same level as the first small gear 313. The second small gear 323 is coaxially fixed to a surface of the second large gear 322 opposite to the housing 100 through the second pivot 321, in other words, the second small gear 323 is fixed to the second large gear 322 through the second pivot 321, so the second small gear 323 and the second large gear 322 move synchronously.
The third reduction gear 330 includes a third pivot 331, a third gearwheel 332 and a third pinion 333. The third gearwheel 332 is coaxially pivoted to the housing 100 via a third pivot 331, engages with the second pinion 323, and is located at the same level as the second pinion 323. The third small gear 333 is coaxially fixed to a surface of the third large gear 332 opposite to the housing 100 through the third pivot 331, engages with the second gear set 340, and is located at the same level as the second gear set 340, in other words, the third small gear 333 is fixed to the third large gear 332 through the third pivot 331, so that the third small gear 333 and the third large gear 332 move synchronously.
Fig. 5 is a schematic diagram illustrating an angle sensing unit 501 according to an embodiment of the invention. As shown in fig. 5, the angle sensing unit 501 of this embodiment is substantially the same as the angle sensing unit 500 of fig. 1, except that the angle sensing unit 501 further includes a second magnetic sensing element 530, and the sensing signal of the second magnetic sensing element 530 is complementary to the sensing signal of the first magnetic sensing element 520. The second magnetic sensing element 530 is soldered to the other side of the wiring board 510 and faces away from the first magnetic sensing element 520 and the magnetic element 400, such that the second magnetic sensing element 530 is located between the first magnetic sensing element 520 and the magnetic element 400. For example, but not limited thereto, the orthographic projection of the axis of the magnetic element 400 overlaps the orthographic projection of the sensing reference points of the first magnetic sensing element 520 and the second magnetic sensing element 530.
Since the first magnetic sensing element 520 or the second magnetic sensing element 530 can sense the magnetic field variation (e.g., voltage) of the magnetic element 400, and the sensing signal of the second magnetic sensing element 530 is complementary to the sensing signal of the first magnetic sensing element 520, in this embodiment, it is determined whether the magnetic field variation opposite to the magnetic field variation of the second magnetic sensing element 530 and the magnetic field variation opposite to the magnetic field variation of the first magnetic sensing element 520 are abnormal, so as to determine whether the angle sensing unit 501 of the angle sensing apparatus is faulty, thereby improving the reliability of the angle sensing unit 501.
Thus, through the architecture of the above embodiments, the present invention not only reduces the resource, time and labor costs, but also overcomes the problems and disadvantages caused by the complicated structure and the large volume.
Finally, the above-described embodiments are not intended to limit the invention, and those skilled in the art should be able to make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the present invention is defined by the appended claims.
Claims (13)
1. An angle sensing device, comprising:
a housing;
a linkage gear pivotally located on the housing for coupling with a steering column of a mobile carrier;
a first gear set which is meshed with the linkage gear and is used for proportionally reducing a rotation angle of the linkage gear into a comparison angle within a range of 360 degrees;
a second gear set connected to the first gear set for rotating the comparison angle with the first gear set;
a magnetic element fixed on the second gear set; and
an angle sensing unit, which is configured corresponding to the linkage gear, keeps a gap with the magnetic element and is used for sensing a magnetic field change value generated by the rotation of the magnetic element; and
and the processing unit is electrically connected with the angle sensing unit and used for comparing the absolute angle of the steering column according to the magnetic field change value generated by the magnetic element.
2. The angle sensing device as claimed in claim 1, wherein the second gear set comprises a gear body and a magnet holder, the magnet holder is disposed on one side of the gear body and protrudes toward the angle sensing unit, and a receiving slot is formed at one end of the magnet holder for receiving the magnetic element in a matching manner.
3. The angle sensing device of claim 1, wherein the housing comprises a top cover and a bottom cover, the bottom cover and the top cover are combined with each other, and a surface of the bottom cover facing the top cover has a recess, wherein the linking gear and the first gear set are respectively located in the recess.
4. The angle sensing device of claim 1, wherein the first gear set comprises:
a first speed reduction gear part which is pivoted on the shell and is meshed with the linkage gear for reducing the rotating speed of the linkage gear;
a second speed reduction gear part which is pivoted on the shell and is meshed with the first speed reduction gear part for reducing the rotating speed of the first speed reduction gear part; and
a third speed reduction gear part coaxially pivoted on the first speed reduction gear part and meshed with the second speed reduction gear part and the second gear set to reduce the rotation speed of the second speed reduction gear part and synchronously rotate the magnetic element.
5. The angle sensing device of claim 4, wherein the first reduction gear portion comprises:
a first pivot;
a first gearwheel, which is pivoted on the shell through the first pivot, engages with the linkage gear and is positioned at the same level height with the linkage gear; and
a first pinion gear coaxially and fixedly connected to a surface of the first gearwheel opposite to the casing through the first pivot, wherein the number of teeth of the first gearwheel is greater than that of the first pinion gear.
6. The angle sensing device of claim 5, wherein the second reduction gear portion comprises:
a second pivot;
a second large gear pivotally connected to the housing through the second pivot, engaging the first small gear, and sharing the same level height with the first small gear; and
a second small gear coaxially fixed to the second large gear via the second pivot shaft relative to the housing,
the number of teeth of the second gearwheel is greater than that of the second pinion, and the second gearwheel group is coaxially pivoted to one surface of the second pinion, which is opposite to the shell, through the second pivot.
7. The angle sensing device of claim 6, wherein the third reduction gear portion comprises:
a third gearwheel, which is coaxially pivoted to one surface of the first pinion opposite to the first gearwheel through the first pivot, engages with the second pinion, and shares the same level height with the second pinion; and
a third pinion gear coaxially and fixedly connected to the third gearwheel relative to the casing through the first pivot shaft, meshing with the second gearwheel group and sharing the same level height with the second gearwheel group, wherein the number of teeth of the third gearwheel is greater than that of the third pinion gear.
8. The angle sensing device of claim 1, wherein the first gear set comprises:
a first speed reduction gear part which is pivoted on the shell through a first pivot and is engaged with the linkage gear so as to reduce the rotating speed of the linkage gear;
a second speed reduction gear part which is pivoted on the shell through a second pivot and is meshed with the first speed reduction gear part for reducing the rotating speed of the first speed reduction gear part; and
a third speed reduction gear part pivotally installed on the housing through a third pivot and engaged with the second gear set for reducing the rotation speed of the second speed reduction gear part and synchronously rotating the magnetic element,
the second gear set is pivoted on the housing through a fourth pivot, and the first pivot, the second pivot, the third pivot and the fourth pivot are parallel to each other.
9. The angle sensing device of claim 8, wherein the first reduction gear portion comprises:
a first gearwheel, which is pivoted on the shell through the first pivot, engages with the linkage gear and is positioned at the same level height with the linkage gear; and
a first pinion gear coaxially and fixedly connected to a surface of the first gearwheel opposite to the casing through the first pivot, wherein the number of teeth of the first gearwheel is greater than that of the first pinion gear.
10. The angle sensing device of claim 9, wherein the second reduction gear portion comprises:
a second large gear pivotally connected to the housing through the second pivot, engaging the first small gear, and sharing the same level height with the first small gear; and
a second pinion gear coaxially and fixedly connected to a surface of the second bull gear opposite to the housing through the second pivot, wherein the number of teeth of the second bull gear is greater than that of the second pinion gear.
11. The angle sensing device of claim 10, wherein the third reduction gear portion comprises:
a third gearwheel, which is pivoted to the housing coaxially through the third pivot, engages with the second pinion, and is located at the same level as the second pinion; and
and a third pinion gear coaxially and fixedly connected to one surface of the third gearwheel, which is opposite to the shell, through a third pivot, is meshed with the second gear set and is positioned at the same level height with the second gear set, wherein the number of teeth of the third gearwheel is greater than that of the third pinion gear.
12. The angle sensing device according to claim 1, wherein the angle sensing unit comprises a wiring board, a first magnetic sensing element and a second magnetic sensing element, the first magnetic sensing element and the second magnetic sensing element are respectively located on two opposite sides of the wiring board, and the sensing signal of the first magnetic sensing element is complementary to the sensing signal of the second magnetic sensing element,
wherein the second magnetic sensing element is located between the first magnetic sensing element and the magnetic element.
13. The angle sensing device of claim 1, wherein the processing unit divides a maximum rotation angle at which the steering column can rotate by a total resolution of the angle sensing unit to obtain a unit resolution, and compares an absolute angle of the steering column according to a variation value of a magnetic field induced by the angle sensing unit to the rotation of the magnetic element.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011345607.5A CN114545982A (en) | 2020-11-26 | 2020-11-26 | Angle sensing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011345607.5A CN114545982A (en) | 2020-11-26 | 2020-11-26 | Angle sensing device |
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|---|---|---|---|---|
| KR200395736Y1 (en) * | 2005-06-21 | 2005-09-13 | 대성전기공업 주식회사 | Steering Wheel Angular Velocity Sensor |
| KR20080091889A (en) * | 2007-04-10 | 2008-10-15 | 대성전기공업 주식회사 | Steering wheel angle sensing device for vehicle |
| JP2010175527A (en) * | 2009-02-02 | 2010-08-12 | Showa Corp | Detector and power steering system |
| KR20120004031A (en) * | 2010-07-06 | 2012-01-12 | 엘지이노텍 주식회사 | Torque angle sensor |
| US20140208890A1 (en) * | 2013-01-30 | 2014-07-31 | Hitachi Automotive Systems Steering, Ltd. | Steering angle sensor |
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2020
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200395736Y1 (en) * | 2005-06-21 | 2005-09-13 | 대성전기공업 주식회사 | Steering Wheel Angular Velocity Sensor |
| KR20080091889A (en) * | 2007-04-10 | 2008-10-15 | 대성전기공업 주식회사 | Steering wheel angle sensing device for vehicle |
| JP2010175527A (en) * | 2009-02-02 | 2010-08-12 | Showa Corp | Detector and power steering system |
| KR20120004031A (en) * | 2010-07-06 | 2012-01-12 | 엘지이노텍 주식회사 | Torque angle sensor |
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