CN111751567A - Rotational speed detection device and vehicle - Google Patents
Rotational speed detection device and vehicle Download PDFInfo
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- CN111751567A CN111751567A CN201910244656.0A CN201910244656A CN111751567A CN 111751567 A CN111751567 A CN 111751567A CN 201910244656 A CN201910244656 A CN 201910244656A CN 111751567 A CN111751567 A CN 111751567A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/36—Devices characterised by the use of optical means, e.g. using infrared, visible, or ultraviolet light
Abstract
The invention discloses a speed detection device and a vehicle, wherein the speed detection device comprises: a light source assembly for emitting a plurality of light beams; the rotating speed reflecting counting disc receives the light beams emitted by the light source component and reflects the light beams into corresponding pulse light sources, and the rotating speed reflecting counting disc rotates along with the object to be measured; the data reading assembly comprises a plurality of photosensitive devices which are arranged in one-to-one correspondence with the light beams, and each photosensitive device is used for reading a corresponding pulse light source and converting the read pulse light source into an electric signal; and the processor is connected with the plurality of photosensitive devices and used for calculating the rotating speed of the object to be measured according to the electric signals output by the photosensitive devices. The rotating speed detection device can be used for detecting various rotating speeds, is high in reliability, and is convenient for improving the rotating speed detection precision.
Description
Technical Field
The invention relates to the technical field of detection, in particular to a rotating speed detection device and a vehicle.
Background
The rotating speed is an important characteristic parameter in performance test, and many characteristic parameters of the power machine cannot be determined from the function relation related to the rotating speed, so that the rotating speed measurement is the key point of various fields of industrial production. Therefore, the related technology provides a photoelectric code disc speed measurement method, which is characterized in that a photoelectric code disc is fixed on a motor rotor end shaft, one or more light-transmitting gratings are arranged on the photoelectric code disc, and a photosensitive element corresponds to the back of each grating. When the fixed light source irradiates on the photoelectric code disk, the light transmitted through the grating is received by the photosensitive element and generates a pulse electric signal. If the code number of the photoelectric code disc is 1 and the measured pulse number in the time t is N, the rotating speed N is 60N/(t × 1). The more the number of codes on the code disc, the higher the measurement accuracy.
However, in the above method, the coded code disc is used as a photoelectric switch, and by blocking light on a photoelectric transceiving path, coded pulse data is generated, and the rotating speed of the code disc is measured. Therefore, the light rays transmitted by the method are limited, so that the precision of measuring the angular speed and the rotating speed range are limited, and meanwhile, the light beam focusing transceiving system in the method is large in size, so that the angular resolution of the encoding code disc is limited. Moreover, photoelectric sensing requires a certain intensity, and when the rotating speed of the code wheel is too fast or the scales are too dense, the intensity of each light pulse is reduced, so that the photosensitive elements cannot respectively emit light signals.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a rotation speed detecting device, which can be used for detecting a plurality of rotation speeds, has high reliability, and facilitates to improve the rotation speed detecting precision.
A second object of the invention is to propose a vehicle.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a speed detection apparatus, including: a light source assembly for emitting a plurality of light beams; the rotating speed reflecting counting disc receives the light beams emitted by the light source component and reflects the light beams into corresponding pulse light sources, and the rotating speed reflecting counting disc rotates along with the object to be measured; the data reading assembly comprises a plurality of photosensitive devices which are arranged in one-to-one correspondence with the light beams, and each photosensitive device is used for reading a corresponding pulse light source and converting the read pulse light source into an electric signal; and the processor is connected with the photosensitive devices and used for calculating the rotating speed of the object to be measured according to the electric signals output by the photosensitive devices.
The rotating speed detection device provided by the embodiment of the invention has the advantages that the light source assembly emits a plurality of light beams to the rotating speed reflecting counting disc, the rotating speed reflecting counting disc driven by the object to be detected to rotate reflects the received light beams into the corresponding pulse light sources, the corresponding pulse light sources are read through the photosensitive devices in the data reading assembly and are converted into electric signals, and the processor calculates the rotating speed of the object to be detected according to the electric signals output by the photosensitive devices. The rotating speed detection device can be used for detecting various rotating speeds, is high in reliability, and is convenient for improving the rotating speed detection precision.
In order to achieve the above object, an embodiment of a second aspect of the present invention provides a vehicle, including: the rotating speed detection device.
According to the vehicle provided by the embodiment of the invention, the rotating speed of the wheel can be detected through the rotating speed detection device, the reliability is high, and the rotating speed detection precision is convenient to improve.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a block diagram showing a configuration of a rotation speed detecting apparatus according to a first embodiment of the present invention;
FIG. 2 is a block diagram showing a rotation speed detecting apparatus according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of recording data on a tachometer optical disc according to an embodiment of the present invention;
FIG. 4 is a block diagram showing the structure of a rotation speed detecting apparatus according to a third embodiment of the present invention;
FIG. 5 is a block diagram showing a rotation speed detecting apparatus according to a fourth embodiment of the present invention;
FIG. 6 is a schematic of an electrical signal output by a light sensing device according to one example of the present invention;
FIG. 7 is a schematic diagram of the operation of the rotational speed sensing apparatus according to an example of the present invention; and
fig. 8 is a block diagram of the structure of the vehicle of the embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A speed detection apparatus and a vehicle of an embodiment of the invention are described below with reference to the drawings.
Fig. 1 is a block diagram showing a speed detection device according to an embodiment of the present invention.
As shown in fig. 1, the speed detection apparatus 100 includes: light source assembly 110, tachometer retro-reflective disk 120, data reading assembly 130, and processor 140.
Wherein the light source assembly 110 is used for emitting a plurality of light beams; the counting plate 120 receives the light beams emitted by the light source assembly 110 and reflects the light beams into corresponding pulse light sources, and the counting plate 120 rotates according to the object 200 to be tested (such as a vehicle, a motor, etc.); the data reading assembly 130 includes a plurality of photosensitive devices 131 arranged in one-to-one correspondence with the plurality of light beams, each photosensitive device 131 is configured to read a corresponding pulse light source and convert the read pulse light source into an electrical signal; the processor 140 is connected to the plurality of photosensitive devices 131, and the processor 140 is configured to calculate the rotation speed of the object 200 according to the electrical signals output by the photosensitive devices 131.
In this embodiment, the photosensitive device 131 may include a photodiode, the light source assembly 110 may include a plurality of laser generators, each of the laser generators may be configured to emit a corresponding laser beam, and each of the photosensitive devices 131 and each of the laser generators may be disposed in a suitable manner.
Specifically, when the rotation speed detecting device 100 is used to detect the rotation speed of the object to be detected 200, the rotation speed reflective counting disc 120 is driven to rotate by the transmission mechanism 150 under the action of the object to be detected 200, the plurality of light beams emitted by the light source assembly 110 irradiate the rotation speed reflective counting disc 120, and the intensity of the reflected light beams changes due to the reflection of the light beams by the concave surface or the non-concave surface of the rotation speed reflective counting disc 120 (i.e., the light beams are reflected into corresponding pulse light sources). Each reflected light beam is reflected to the corresponding photosensitive device 131, each photosensitive device 131 converts each received pulse light source into a corresponding electrical signal (i.e. a digital signal "0" or "1"), and sends each electrical signal to the processor 140, and the processor 140 calculates the rotation speed of the object 200 according to each electrical signal. The data reading rate of the data reading component 130 may be 150KB/s to 2 MB/s.
The rotating speed detection device obtains a plurality of electric signals representing the rotating speed by utilizing the reflection principle of light through the matching of a plurality of light beams and a plurality of photosensitive devices, and then the rotating speed is obtained through calculation according to the plurality of electric signals. The rotating speed detection device is wide in application range, can be used for detecting various rotating speeds, such as the rotating speed of an engine, the rotating speed of a motor, the rotating speed of wheels and the like, is high in reliability, and facilitates improvement of the rotating speed detection precision.
In an embodiment of the present invention, as shown in fig. 2, the rotation speed detecting apparatus 100 may further include a transmission mechanism 150, the transmission mechanism 150 is connected to the object to be measured 200 through a transmission assembly 151, and the transmission mechanism 150 is configured to drive the revolution speed reflective counting plate 120 to rotate under the action of the object to be measured 200.
Alternatively, the transmission mechanism 150 may include a rotating shaft for rotating the tachometer dial 120, and the transmission assembly 151 may employ a universal joint or a pulley.
In one embodiment of the present invention, the tachometer light reflex counter 120 may be a tachometer code disc program data disc, and the tachometer code disc program data disc may be pre-recorded with a plurality of circles of data corresponding to the plurality of laser beams one to one. For example, the number of the laser generators is 4, and 4 circles of data are recorded on the speed measuring code disc program data disc.
Specifically, as shown in fig. 3,4 circles of data may be respectively recorded on a first circular ring, a second circular ring, a third circular ring and a fourth circular ring which are sequentially arranged from outside to inside on the velocity-measuring code-disc program data disc, wherein the first circular ring, the second circular ring, the third circular ring and the fourth circular ring are concentric circular rings. Thus, the data read by each photosensitive device 131 in the data reading assembly 130 at different radial positions is the same.
In one example, the second ring is provided with a first group of reflective dots, a second group of reflective dots, a third group of reflective dots and a fourth group of reflective dots, wherein one blocking dot is arranged between two adjacent groups of reflective dots. The first group of reflective dots can comprise one reflective dot, the second group of reflective dots can comprise two reflective dots which are continuously arranged, the third group of reflective dots can comprise three reflective dots which are continuously arranged, and the fourth group of reflective dots can comprise four reflective dots which are continuously arranged. It should be understood that a reflective spot refers to a region that reflects an incident beam and a blockage spot refers to a region that does not reflect an incident beam.
For example, starting from the first group of reflective dots, the second ring is sequentially recorded with one reflective dot, one blocking dot, two reflective dots, one blocking dot, three reflective dots, one blocking dot, four reflective dots, one blocking dot, and a blocking dot, for a total of 30 reflective dots and 12 blocking dots. When the rotating speed reflective counting disc 120 rotates according to the above direction, the counting value read by the photosensitive device 131 corresponding to the second ring is: 1,2,3,4,1,2,3,4,1,2,3, 4, …,1,2,3,4, …; when the rotating speed reflective counting disc 120 rotates in the reverse direction of the above direction, the photosensitive device 131 corresponding to the second ring reads the following count value: 4,3,2,1,4,3,2,1, 4,3,2,1, …,4,3,2,1, …. Thus, the rotation direction of the object 200 can be determined from the read count value.
Certainly, the arrangement manner of the reflective dots and the blocking dots on the second circular ring is not limited to the above manner, and a first group of reflective dots and a second group of reflective dots may be sequentially and cyclically arranged on the second circular ring, wherein one blocking dot is arranged between two adjacent groups of reflective dots, the first group of reflective dots may include one reflective dot, and the second group of reflective dots may include two reflective dots which are continuously arranged; or, referring to fig. 3, a reflection point, a blocking point, two reflection points, a blocking point, three reflection points, a blocking point, four reflection points, a blocking point, a reflection point, a blocking point, two reflection points, a blocking point, three reflection points, and a blocking point are sequentially recorded on the second ring, and 26 reflection points and 11 blocking points are counted. That is, as long as the tachometer light reflecting counting plate 120 rotates in two directions, the count values may be set differently.
Note that, in fig. 3, the closed dots are indicated by solid circles, and the light-reflecting dots are indicated by open circles.
Furthermore, n1 reflective points can be continuously arranged on the first circular ring, n2 reflective points are continuously arranged on the third circular ring, and n3 reflective points are continuously arranged on the fourth circular ring, wherein n1, n2 and n3 are positive integers, and n1 is greater than n2 is greater than n 3. The size of the reflective dots on each ring is the same, and the size of the blocking dots on the second ring is also the same as the size of the reflective dots. In addition, if m1 reflective dots and m2 blocking dots are arranged on the second circular ring, n1 > m1+ m2 > n2 > n 3.
In an embodiment of the present invention, as shown in fig. 4, the rotation speed detecting apparatus 100 may further include: the USB connector 160 and the USB connector 160 are respectively connected to the processor and the external controller 300, wherein the processor 140 is further configured to transmit the rotation speed to the external controller 300.
For example, when the rotation speed detecting device 100 is used to detect a vehicle speed, the object under test 200 may be a wheel axle of a vehicle, and the external controller 300 may be an onboard controller of the vehicle, and at this time, the transmission mechanism 150 of the rotation speed detecting device 100 may be connected to the wheel axle, so that the transmission mechanism 150 drives the rotation speed reflective counting plate 120 to rotate when the wheel axle rotates. The processor 140 may send the calculated rotational speed to the onboard controller via the USB connector 160.
Optionally, the USB connector 160 and the processor 140 may be a pluggable connection.
In an embodiment of the present invention, the rotation speed detecting apparatus 100 further includes a cd-rom box, a tray, an upper cover, and the like, wherein the tray is disposed in the cd-rom box and is used for placing the rotation speed reflective counting plate 120, and the upper cover covers the cd-rom box; the light source assembly 110 may further include a semi-total reflecting prism, an objective lens, a lens, and the like.
When the data reading assembly 130 reads the data on the tachometer dish 120, the laser light emitted from the laser generator passes through the semi-reflective prism and is focused on the objective lens, which focuses the laser light into an extremely fine light spot and strikes the tachometer dish 120. At this time, the reflecting material on the revolution counter 120 reflects the irradiated light back, passes through the objective lens, and then irradiates the semi-reflecting prism.
Because the prism is a semi-reflective structure, the laser beam does not pass completely through it and back to the laser generator, but is reflected, through the lens, and focused onto the photodiode. Since the surface of the tachometer dial 120 is formed with a plurality of uneven spots for recording data, the reflected light is directed in different directions. The signals emitted to different directions can be defined as "0" or "1", the photodiode receives the data arranged by "0" or "1", the photodiode outputs corresponding electrical signals according to the data, and the processor 140 calculates the rotating speed according to the electrical signals.
In one embodiment of the present invention, the processor 140 is further configured to calculate a tracking error according to the electrical signal output by each photosensitive device 131, and generate a tracking command according to the tracking error when the tracking error is not 0. In this embodiment, as shown in fig. 5, the rotation speed detecting apparatus 100 further includes: a tracking component 170. The tracking module 170 is connected to the processor 140, and the tracking module 170 is configured to adjust the light source module 110 and/or the data reading module 130 according to the tracking command after receiving the tracking command, so that the tracking error is 0.
In particular, tracking means that the light source assembly 110 and the data reading assembly 130 can always be correctly aligned with the track on which data is recorded. When the laser beam just coincides with the track, the tracking error is 0, otherwise the tracking error may be positive or negative, and at this time, the processor 140 generates a tracking command according to the tracking error and sends the tracking command to the tracking component 170, and the tracking component 170 can properly adjust the posture of the light source component 110 and/or the data reading component 130 according to the tracking command, for example, can control the objective lens in the light source component 110 to move on the plane parallel to the tacho reflectometer 120. This can improve the accuracy of reading data by the data reading unit 130, and can improve the error correction capability and stability of the rotation speed detecting apparatus 100.
Further, the processor 140 may be further configured to calculate a focus error from the electrical signals output from the respective photosensitive devices 131, and generate a focus instruction from the focus error when the focus error is not 0. In this embodiment, as shown in fig. 5, the rotation speed detecting apparatus 100 further includes: a focusing assembly 180. The focusing assembly 180 is connected to the processor 140, and the focusing assembly 180 is configured to adjust the light source assembly 110 and/or the data reading assembly 130 according to the focusing instruction after receiving the focusing instruction, so that the focusing error is 0.
In particular, focusing means that the laser generator can accurately hit the laser beam onto the tachometer plate 120 and each photodiode can receive the strongest signal. Therefore, the invention engraves the same data on all tracks on the revolution speed reflecting counting disc 120, i.e. the revolution speed calculated according to the data read from each circle of data is the same. Referring to fig. 3, when 4 laser beams are reflected from the tachometer plate 120, they hit 4 photodiodes simultaneously. They add the signals to form a focus error, and when the focus is accurate, the focus error is 0, otherwise, the focus is not accurate, and at this time, the processor 140 generates a focus instruction according to the focus error and sends the focus instruction to the focusing assembly 180, and the focusing assembly 180 can correct the position of the light source assembly 110 and/or the data reading assembly 130 according to the focus instruction, for example, the objective lens in the light source assembly 110 can be controlled to move on the surface perpendicular to the surface of the rotating speed reflective counting disc 120. This can further improve the accuracy of reading data by the data reading unit 130, and further improve the error correction capability and stability of the rotation speed detecting apparatus 100.
For ease of understanding, the operation principle of the rotation speed detecting apparatus 100 according to the embodiment of the present invention is described below with reference to fig. 3, 6 and 7:
as shown in fig. 7, the control circuit 1 can control 4 laser generators in the light source module 110 to emit four laser beams, wherein the control circuit 1 can be connected to the corresponding light source module 110 through 4 GPIOs (General-purpose input/output ports). As shown in fig. 3, four laser beams may be respectively applied to the first ring, the second ring, the third ring and the fourth ring of the tacho light reflecting counting plate 120. The revolution counter 120 can rotate with the object 200 (e.g. a certain wheel axle of a vehicle) under the driving of the transmission mechanism 150; equal-interval reflective points are arranged on the four circular rings, 36 reflective points are arranged on the third circular ring, and some of the reflective points on the second circular ring are blocked and marked as blocking points. It should be noted that the density of the reflective dots on each ring of the actual speed reflective counting disc 120 is very large, and may be ten thousand times of the number of the reflective dots in fig. 3, for example, 36 reflective dots are arranged on the third ring in fig. 3, and may actually be 360000 reflective dots.
Specifically, referring to fig. 3, a reflection point, a blocking point, two consecutive reflection points, a blocking point, three consecutive reflection points, a blocking point, four consecutive reflection points, a blocking point, a reflection point, a blocking point, two consecutive reflection points, a blocking point, three consecutive reflection points, and a blocking point are sequentially arranged on the second ring from a, and the loop is completed.
When the revolution counter 120 rotates in this direction, the count value is 1,2,3,4,1,2,3,4,1,2,3, …,1,2,3,4,1,2,3,4,1,2,3, 4,1,2,3 numbers from small to large; when the tachometer retroreflective counter disk 120 is rotated in the opposite direction, the count is a number of 3,2,1,4,3,2,1, 4,3,2,1, … 3,2,1,4,3,2,1, 4,3,2,1, from large to small.
Referring to fig. 7, the four laser beams are reflected by the tachometer plate 120 to each corresponding photodiode, and as the tachometer plate 120 rotates, the continuous laser beams are reflected to a pulse light source, and the photodiodes are sensed to the pulse light source and converted to electrical signals. The electrical signal is integrated by the control circuit 2 and then output to the processor 140, and the processor 140 calculates the rotation speed according to the electrical signal, and then the calculated rotation speed is output to the vehicle-mounted controller through the USB connector 160, so that the vehicle-mounted controller correspondingly controls the vehicle according to the rotation speed. The control circuit 2 may be connected to the corresponding photosensitive device 131 through 4 GPIOs.
As shown in fig. 6, when the object 200 to be measured rotates at a constant rotational speed, the electrical signals output by the photodiodes corresponding to the first ring (i.e., (synchronous) photodiodes), the photodiodes corresponding to the third ring (i.e., (high-speed) photodiodes), and the photodiodes corresponding to the fourth ring (i.e., (low-speed) photodiodes) are uniform pulse signals, and the number of pulses decreases sequentially, and the rotational speed can be calculated according to the three groups of pulses. Meanwhile, due to the existence of the blockage point, the electrical signal output by the photodiode (i.e., the (directional) photodiode) corresponding to the second ring is a non-uniform pulse signal, and the steering of the object 200 to be measured can be judged according to the pulse signal. Thus, the measured rotating speed can be obtained.
Alternatively, referring to fig. 7, a memory 190 may be provided corresponding to the processor 140, and the memory 190 may store a program for calculating the rotation speed, and the processor 140 may execute the program; the processor 140 may also store the calculated rotational speed in the memory 190.
For example, taking 36 reflective dots arranged on the third ring as an example, each wheel rotates 10 ° and outputs one pulse. Let the radius of the revolution counter 120 be r, the angular resolution be θ, and the time be t, then the distance resolution is: 2 pi r theta/360 degrees, and the rotation speed resolution is as follows: sigma/t; when θ is 10 °, r is 4cm, and t is 1ms, σ is 2 π r θ/360 ° is 0.7cm, and σ/t is 7 m/s.
Taking the example that 9 reflective points are arranged on the fourth ring, a pulse is output every 40 degrees of rotation of the wheel. Let the radius of the revolution counter 120 be r and the angular resolution be θ, then the distance resolution is: σ ═ 2 π r θ/360 °; when theta is 40 degrees, r is 4cm and t is 1ms, sigma is 2 pi r theta/360 degrees, 2.8cm and sigma/t is 28 m/s.
Therefore, when the density of the reflection points is high, the measurement accuracy of the rotating speed is high. In addition, because the resolution ratio of the rotating speed calculated according to the outer ring is higher than that calculated by the inner ring, the requirement on the measurement precision is not high for the measured object with lower rotating speed, and the rotating speed can be calculated by adopting the electric signal detected by the inner ring to reduce the calculation cost; for a measured object with higher rotating speed, the requirement on measuring precision is higher, and at the moment, the rotating speed can be calculated by adopting an electric signal obtained by detecting the inner ring circular ring.
In summary, the rotation speed detection device according to the embodiment of the invention can be used for detecting various rotation speeds (such as engine rotation speed, motor rotation speed, wheel rotation speed, and the like), including the magnitude and direction of the detected rotation speed, and has high detection accuracy.
Fig. 8 is a block diagram of the structure of the vehicle of the embodiment of the invention.
As shown in fig. 8, the vehicle 1000 includes the rotation speed detection apparatus 100 of the above embodiment.
In this embodiment, the rotation speed detecting apparatus 100 may be mounted on one wheel axle of the vehicle 1000 to detect the rotation speed of the wheel.
According to the vehicle provided by the embodiment of the invention, the rotating speed detection device can be used for detecting the magnitude and the direction of the rotating speed of the wheel, and the detection precision is high.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (13)
1. A speed detection device, comprising:
a light source assembly for emitting a plurality of light beams;
the rotating speed reflecting counting disc receives the light beams emitted by the light source component and reflects the light beams into corresponding pulse light sources, and the rotating speed reflecting counting disc rotates along with the object to be measured;
the data reading assembly comprises a plurality of photosensitive devices which are arranged in one-to-one correspondence with the light beams, and each photosensitive device is used for reading a corresponding pulse light source and converting the read pulse light source into an electric signal;
and the processor is connected with the photosensitive devices and used for calculating the rotating speed of the object to be measured according to the electric signals output by the photosensitive devices.
2. A rotation speed detecting apparatus according to claim 1, wherein the light source assembly includes a plurality of laser generators, each for emitting a corresponding laser beam.
3. A rotation speed detecting device according to claim 2, wherein the rotation speed reflecting counting disc is a speed measuring code disc program data disc, and a plurality of circles of data corresponding to the plurality of laser beams one to one are recorded on the speed measuring code disc program data disc.
4. The device for detecting the rotation speed according to claim 3, wherein the number of the laser generators is 4, and the data are respectively recorded on a first circular ring, a second circular ring, a third circular ring and a fourth circular ring which are sequentially arranged from outside to inside on the velocity measurement code disc program data disc, wherein the first circular ring, the second circular ring, the third circular ring and the fourth circular ring are concentric circular rings.
5. A rotation speed detecting device according to claim 4, wherein the second ring has a first set of reflective dots, a second set of reflective dots, a third set of reflective dots and a fourth set of reflective dots, and wherein a jam point is provided between two adjacent sets of reflective dots.
6. A rotation speed detecting device according to claim 5, wherein the first group of the light reflecting dots includes one light reflecting dot, the second group of the light reflecting dots includes two light reflecting dots arranged in series, the third group of the light reflecting dots includes three light reflecting dots arranged in series, and the fourth group of the light reflecting dots includes four light reflecting dots arranged in series.
7. A rotation speed detecting apparatus according to any one of claims 4-6, wherein n1 reflective dots are continuously disposed on the first ring, n2 reflective dots are continuously disposed on the third ring, and n3 reflective dots are continuously disposed on the fourth ring, wherein n1, n2, n3 are positive integers, and n1 > n2 > n 3.
8. A rotation speed detecting apparatus according to claim 1, wherein the processor is further configured to calculate a tracking error from the electrical signal output from each photosensitive device, and generate a tracking command from the tracking error when the tracking error is not 0, the rotation speed detecting apparatus further comprising:
and the tracing component is connected with the processor and used for adjusting the light source component and/or the data reading component according to the tracing instruction after receiving the tracing instruction so as to enable the tracing error to be 0.
9. A rotation speed detecting apparatus according to claim 1, wherein the processor is further configured to calculate a focus error from the electrical signals output from the respective photosensitive devices, and to generate a focus command from the focus error when the focus error is not 0, the rotation speed detecting apparatus further comprising:
and the focusing assembly is connected with the processor and is used for adjusting the light source assembly and/or the data reading assembly according to the focusing instruction after receiving the focusing instruction so as to enable the focusing error to be 0.
10. A rotation speed detecting apparatus according to claim 1, further comprising:
and the transmission mechanism is connected to the measured object through the transmission assembly and is used for driving the rotating speed reflecting counting disc to rotate under the action of the measured object.
11. A rotation speed detecting apparatus according to claim 1, further comprising:
and the USB connector is respectively connected with the processor and the external controller, and the processor is also used for sending the rotating speed to the external controller.
12. A speed detection device according to claim 10, wherein the transmission assembly comprises a universal joint or a pulley.
13. A vehicle, characterized by comprising: a rotation speed detecting apparatus according to any one of claims 1 to 12.
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Cited By (1)
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