Speed measuring device

Abstract

The embodiment of the utility model provides a speed measuring device which is used for measuring the running speed of a measured vehicle running on a road surface, the road surface is provided with a datum line consistent with the running direction of the measured vehicle, and the speed measuring device comprises a speed measuring module, a reference line projection module, an angle recording module and a calculation module, the speed measurement module and the angle recording module are electrically connected with the calculation module; the reference line projection module is used for projecting on the road surface to form a reference line; the relative positions of the reference line projection module and the speed measurement module are fixedly arranged, so that a first included angle is formed between the reference line and the detection direction of the speed measurement module; the angle recording module is used for recording the first included angle; when the reference line is perpendicular to the datum line, the calculation module is used for calculating the actual driving speed of the measured vehicle according to the first included angle obtained by the angle recording module.

Description

Technical Field

[0001] This application relates to the technical field of traffic speed measurement, and particularly to a speed measurement device. Background Art

[0002] A radar speed measurement device is a device that uses the Doppler effect to measure speed and is widely used in highway speed measurement. During the speed measurement process, the radar speed measurement device sends electromagnetic waves with a preset frequency to the vehicle to be measured, and then receives the electromagnetic waves reflected by the vehicle. If the vehicle to be measured moves in the direction approaching the radar speed measurement device, the frequency of the echo received by the radar speed measurement device is greater than the frequency of the electromagnetic waves it sends out, and the greater the speed of the vehicle to be measured, the greater the frequency difference between the transmitted and received electromagnetic waves. Similarly, if the vehicle to be measured moves in the direction away from the radar speed measurement device, the frequency of the echo received by the radar speed measurement device is less than the frequency of the electromagnetic waves sent out, and the greater the speed of the vehicle to be measured, the greater the frequency difference between the transmitted and received electromagnetic waves. Thus, the driving speed of the vehicle to be measured can be calculated through the frequency difference between the electromagnetic waves transmitted and received by the radar speed measurement device.

[0003] However, when the radar speed measurement device is installed on both sides of the road, there is a certain angle between the radar detection direction and the vehicle driving direction on the horizontal plane. When the radar speed measurement device measures the speed of an oncoming vehicle, as Figure 1 shown on the right side, the angle between the radar detection direction and the vehicle driving direction is α. The speed v1 directly measured by the radar speed measurement device according to the Doppler effect is only a component of the actual vehicle speed v in the radar detection direction, and the actual speed v of the oncoming vehicle to be measured still needs to be calculated through the formula v = v1 / cosα. Similarly, when measuring the speed of a departing vehicle, as Figure 1 shown on the left side, the angle between the radar detection direction and the vehicle driving direction is α'. The speed v1' directly measured by the radar speed measurement device according to the Doppler effect is only a component of the actual vehicle speed v' in the radar detection direction, and the actual speed v' of the departing vehicle to be measured still needs to be calculated through the formula v' = v1' / cosα'.

[0004] To facilitate the use of the radar speed measurement device, the angle between the radar detection direction and the vehicle driving direction is usually a preset value of the radar speed measurement device. When the radar speed measurement device is working, the radar speed measurement device calculates the actual speed of the vehicle to be measured at the set angle; therefore, when installing the radar speed measurement device, it is necessary to adjust the angle of the radar speed measurement device so that the actual value of the angle between the radar detection direction and the vehicle driving direction is consistent with the set value. The deviation between the actual value and the set value of the angle between the radar detection direction and the vehicle driving direction will affect the accuracy of the calculated vehicle speed. If the deviation between the actual value and the set value is greater, the deviation between the calculated vehicle speed and the actual vehicle speed will also be greater.

[0005] In order to make the actual value of the angle between the radar detection direction and the vehicle driving direction closer to the set value, in a radar speed measurement device of an existing technology, as Figure 1 shown, a first reference line X1 and a second reference line X2 are provided on the top cover of the radar speed measurement device. The first reference line X1 and the second reference line X2 respectively point to the left and right sides of the radar detection direction. The angles between the first reference line X1 and the radar detection direction and between the second reference line X2 and the radar detection direction are both 25°.

[0006] If it is necessary to measure the speed of an oncoming vehicle, as Figure 1 shown on the right side, the radar speed measurement device is installed on the outside of the lane where the speed needs to be measured, and the angle of the radar speed measurement device is visually adjusted so that the direction of the first reference line X1 on its top is parallel to the road edge line, and the direction of the first reference line X1 is opposite to the driving direction of the lane where the speed needs to be measured. Thus, the actual value of the angle α between the radar detection direction and the vehicle driving direction is equal to the set value of 25°; after installation, the radar speed measurement device detects the oncoming vehicle head, obtains the speed component v1 of the measured vehicle in the radar detection direction, and calculates the vehicle driving speed v based on the detected speed component v1 and the set value of the angle α between the radar detection direction and the vehicle driving direction.

[0007] Similarly, if it is necessary to measure the speed of a departing vehicle, as Figure 1 shown on the left side, the radar speed measurement device is installed on the outside of the lane where the speed needs to be measured, and the angle of the radar speed measurement device is visually adjusted so that the direction of the second reference line X2 on its top is parallel to the road edge line, and the direction of the second reference line X2 is the same as the driving direction of the lane where the speed needs to be measured. Thus, the actual value of the angle α' between the radar detection direction and the vehicle driving direction is equal to the set value of 25°; after installation, the radar speed measurement device detects the departing vehicle tail, obtains the speed component v1' of the measured vehicle in the radar detection direction, and calculates the vehicle driving speed v' based on the detected speed component and the set value of the angle α' between the radar detection direction and the vehicle driving direction.

[0008] In addition, if there is a median strip in the middle of the road, the radar speed measurement device can also be set on the median strip in the middle of the road. If it is necessary to measure the vehicle speed in the oncoming direction, the second reference line X2 is made parallel to the median strip, and the direction of the second reference line X2 is opposite to the driving direction of the lane where the speed needs to be measured; if it is necessary to measure the vehicle speed in the departing direction, the first reference line X1 is made parallel to the median strip, and the direction of the first reference line X1 is the same as the driving direction of the lane where the speed needs to be measured.

[0009] However, in this prior art, due to the error of the human eye's line of sight, it is actually very difficult to accurately adjust the first reference line X1 or the second reference line X2 to be completely parallel to the corresponding road edge line. There is still a certain deviation between the actual value and the set value of the included angle between the radar detection direction and the vehicle driving direction, resulting in an inaccurate calculated actual vehicle speed.

[0010] In the Chinese utility model patent with the application number CN202220242300.0 and the title "Portable Multifunctional Handheld Speed Measuring Instrument and Speed Measuring Instrument System", a speed measuring instrument system is disclosed. The speed measuring instrument system includes a radar module, a laser module, and an angle measurement module. When the angle zeroing program starts, the speed measuring instrument is set on a tripod and placed within a range of 1 - 2 meters from the lane. The laser module projects a crosshair on the road surface. Then, with the tripod as the center, the speed measuring instrument is rotated. When the crosshair is flush with the lane line, the radar irradiation direction is parallel to the lane line, and the gyroscope angle at this time is calibrated to 0°. Finally, the speed measuring instrument is rotated, and the gyroscope module built into the speed measuring instrument will automatically display the detected rotation angle on the display screen interface. After adjusting the angle to 25°, the radar speed measuring instrument is fixed on the tripod. During the test, calculations are performed in the background. For example, if the speed value given by the radar is set as V and the actual vehicle speed value is V1, the actual vehicle speed is calculated according to the formula V1 = V / COS25°.

[0011] However, in this prior art, the positional relationship between the crosshair and the lane line is determined through parallel or coincident geometric relationships. Therefore, the speed measuring instrument needs to be set within a certain distance range from the lane line. Otherwise, the distance between the crosshair projected by the laser and the lane line is too large to determine whether the crosshair is parallel or coincident with the lane line, which results in the setting position of the speed measuring instrument being not flexible enough and having the disadvantage of inconvenient use.

[0012] Technical problems existing in the prior art:

[0013] Using the reference line on the top of the radar speed measuring device visually by the human eye to determine the parallel or coincident relationship with the lane line, or using the crosshair projected by the laser module to determine the parallel or coincident relationship with the lane line, the speed measuring device needs to be set within a certain distance range from the lane line. Otherwise, the distance between the reference line or the crosshair projected by the laser and the lane line is too large to determine whether the lane line is parallel or coincident with the crosshair or the reference line, which results in the setting position of the speed measuring device being not flexible enough and having the disadvantage of inconvenient use. Utility Model Content

[0014] An embodiment of the present application provides a speed measurement device that determines the positional relationship between a reference line and a reference baseline through a vertical geometric relationship. Since the reference line has a certain length and extends from the road edge towards the road center, regardless of whether the speed measurement device is close to or far from the reference baseline, the projected reference line can intersect the reference baseline, enabling a more accurate determination of the vertical relationship and making the installation position of the speed measurement device more flexible.

[0015] An embodiment of the present application provides a speed measurement device for measuring the driving speed of a measured vehicle traveling on a road surface. A reference baseline consistent with the driving direction of the measured vehicle is provided on the road surface. The speed measurement device includes:

[0016] A speed measurement module, a reference line projection module, an angle recording module, and a calculation module. The speed measurement module and the angle recording module are electrically connected to the calculation module;

[0017] The reference line projection module is used to project and form a reference line on the road surface;

[0018] The relative positions of the reference line projection module and the speed measurement module are fixedly set, such that a first included angle is formed between the reference line and the detection direction of the speed measurement module;

[0019] The angle recording module is used to record the first included angle;

[0020] When the reference line is perpendicular to the reference baseline, the calculation module is used to calculate the actual driving speed of the measured vehicle according to the first included angle obtained from the angle recording module.

[0021] In an optional embodiment of the present application, the speed measurement module is one of:

[0022] A radar speed measurement module, a laser speed measurement module, or an ultrasonic speed measurement module.

[0023] In an optional embodiment of the present application, the reference line projection module is one of:

[0024] A single-line laser, a cross-line laser, or a projector.

[0025] In an optional embodiment of the present application, a camera module is further included. The imaging direction of the camera module is consistent with the detection direction, and the camera module is used to capture an image of the measured vehicle.

[0026] In an optional embodiment of the present application, a display module communicatively connected to the calculation module is further included. The display module is used to display the actual driving speed.

[0027] In an optional embodiment of the present application, a housing is further included;

[0028] The speed measurement module, the reference line projection module, the angle recording module, and the calculation module are disposed on the housing.

[0029] In an optional embodiment of the present application, it further includes a camera module, a housing, and a display module;

[0030] The shooting direction of the camera module is consistent with the detection direction, and the camera module is used to capture an image of the vehicle to be measured;

[0031] The display module is communicatively connected to the calculation module and is used to display the actual driving speed;

[0032] The speed measurement module and the camera module are jointly disposed on the first side surface of the housing;

[0033] The reference line projection module is disposed on the bottom surface of the housing;

[0034] The display module is disposed on the second side surface of the housing opposite to the first side surface, so that the display module is disposed opposite to the speed measurement module and the camera module on the housing.

[0035] In an optional embodiment of the present application, the reference line projection module includes a first reference line projection module and a second reference line projection module. The first reference line projection module can project a first reference line on the road surface, and the second reference line projection module can project a second reference line on the road surface.

[0036] In an optional embodiment of the present application, it further includes a housing. The bottom surface of the housing is provided with a first groove for placing the first reference line projection module and a second groove for placing the second reference line projection module;

[0037] The first reference line projection module is disposed in the first groove without protruding from the bottom surface of the housing, and the second reference line projection module is disposed in the second groove without protruding from the bottom surface of the housing.

[0038] In an optional embodiment of the present application, the first reference line projected by the first reference line projection module on the road surface is symmetrical to the second reference line projected by the second reference line projection module on the road surface along the detection direction of the speed measurement module.

[0039] Advantageous effects of the embodiments of the present application:

[0040] The utility model projects a reference line on the road surface through a reference line projection module, and adjusts the deflection angle of the speed measurement device according to the perpendicular relationship between the reference line and the reference line, so as to reduce the deviation between the set value and the actual value of the included angle between the driving direction of the vehicle to be measured and the detection direction, and improve the accuracy of the detection result of the speed measurement device.

[0041] In addition, the reference line is projected on the road surface so that the reference line and the reference line are in the same plane, and the positional relationship between the reference line and the reference line is determined through the perpendicular geometric relationship. Since the reference line has a certain length and extends from the edge of the road surface to the center of the road surface, no matter whether the speed measurement device is close to or far from the reference line, the projected reference line can intersect with the reference line, so that the perpendicular relationship can be judged more accurately, and the installation position of the speed measurement device can be more flexible. Description of the Drawings

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained according to these drawings without creative work.

[0043] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, where the same reference numerals represent the same parts in the following description.

[0044] Figure 1 Schematic diagram of the usage state of the speed measurement device in the prior art;

[0045] Figure 2 Stereogram of the speed measurement device in the embodiment of the present utility model;

[0046] Figure 3 Side structure diagram of the speed measurement device in the embodiment of the present utility model;

[0047] Figure 4 Bottom structure diagram of the speed measurement device in the embodiment of the present utility model;

[0048] Figure 5 Back structure diagram of the speed measurement device in the embodiment of the present utility model;

[0049] Figure 6 Circuit connection relationship diagram of the speed measurement device in the embodiment of the present utility model;

[0050] Figure 7 Schematic diagram of the beam structure of the one-line laser;

[0051] Figure 8Three-dimensional schematic diagram of the usage state of the reference line projection module of the speed measurement device according to the embodiment of the present utility model, which projects a reference line on the road surface;

[0052] Figure 9 Schematic diagram of the beam structure of a common laser;

[0053] Figure 10 Planar schematic diagram of the usage state of the speed measurement device according to the embodiment of the present utility model;

[0054] Figure 11 Another planar schematic diagram of the usage state of the speed measurement device according to the embodiment of the present utility model.

[0055] Reference numerals:

[0056] 100, speed measurement device; 10, speed measurement module; 20, reference line projection module; 20a, first reference line projection module; 20b, second reference line projection module; 30, recording module; 31, memory; 40, calculation module; 50, camera module; 60, housing; 61, first side; 62, second side; 63, top surface; 64, bottom surface; 65, first end face; 66, second end face; 67, holding portion; 641, first groove; 642, second groove; 70, display module; 80, support feet; 90, bracket mounting holes;

[0057] 200, vehicle to be measured;

[0058] 300, road surface;

[0059] L1, reference line; L11, road surface edge line; L12, road surface center line; L13, road shoulder; L2, reference line; L21, first reference line; L22, second reference line;

[0060] D1, detection direction; D2, driving direction; D21, incoming direction; D22, outgoing direction;

[0061] v, actual driving speed; v′, actual driving speed; v1, speed component; v1′, speed component; β, first included angle; α, second included angle; β′, first included angle; α′, second included angle. Detailed implementation manners

[0062] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0063] As used herein, the mention of "embodiment" or "implementation" means that the specific features, structures, or characteristics described in connection with the embodiment or implementation may be included in at least one embodiment of the present application. The appearance of this phrase at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0064] As Figures 2 to 11 shown, an embodiment of the present invention provides a speed measurement device 100. The speed measurement device 100 is used to measure the traveling speed of a measured vehicle 200 traveling on a road surface 300. A reference line L1 consistent with the traveling direction D2 of the measured vehicle 300 is provided on the road surface 300. The speed measurement device 100 includes a speed measurement module 10, a reference line projection module 20, an angle recording module 30, and a calculation module 40. Both the speed measurement module 10 and the angle recording module 30 are electrically connected to the calculation module 40. The reference line projection module 20 is used to project a reference line L2 on the road surface 300, and the reference line L2 intersects the reference line L1. The relative positions of the reference line projection module 20 and the speed measurement module 10 are fixedly arranged such that a first included angle β is formed between the reference line L2 and the detection direction D1 of the speed measurement module 10. The angle recording module 30 is used to record the first included angle β. When the reference line L2 is perpendicular to the reference line L1, the calculation module 40 is used to calculate the actual traveling speed v of the measured vehicle 200 based on the first included angle β obtained from the angle recording module 30.

[0065] It can be understood that when the reference line L2 is perpendicular to the reference line L1, the complementary angle of the first included angle β is a second included angle α, and the second included angle α is the included angle between the traveling direction D2 of the measured vehicle 200 and the detection direction D1. When the first included angle β is determined, the angle of the second included angle α is also determined. Based on this, the angle recording module 30 is further used to record the second included angle α.

[0066] The calculation module 40 is further used to calculate the actual traveling speed v of the measured vehicle 200 based on the second included angle α obtained from the angle recording module 30. It can be understood that the calculation module 40 calculating the actual traveling speed v of the measured vehicle 200 based on the second included angle α is equivalent to the calculation module 40 calculating the actual traveling speed v of the measured vehicle 200 based on the first included angle β. Calculating the actual traveling speed through the second included angle α is the most commonly used calculation method in the prior art.

[0067] Compared with the prior art, the reference line L2 of the present utility model is perpendicular to the reference line L1, which is different from the prior art (regardless of whether the reference line is generated by means of a laser). Moreover, compared with the prior art in terms of the way of generating the reference line, the present utility model uses the angle recording module 30 to record in advance the required included angle values such as the first included angle β and / or the second included angle α. That is, the present utility model uses preset angle values. After measuring the driving speed of the vehicle 200 to be measured, the calculation module 40 of the present utility model can directly obtain the angle value from the angle recording module 30, and then calculate the actual driving speed v of the vehicle 200 to be measured by combining the speed component of the vehicle 200 to be measured tested by the speed measurement module 10.

[0068] Compared with the prior art, the present utility model adopts a different relationship between the reference line and the reference line. Specifically, the present utility model adjusts the deflection angle of the speed measurement device 100 through the perpendicular relationship between the reference line and the reference line, so as to reduce the deviation between the set value and the actual value of the included angle between the driving direction D2 of the vehicle 200 to be measured and the detection direction D1, and improve the accuracy of the detection result of the speed measurement device 100.

[0069] On the basis of adjusting the deflection angle of the speed measurement device 100 through the perpendicular relationship between the reference line L2 and the reference line L1, the present utility model can directly calculate the actual driving speed v of the vehicle 200 to be measured by using the preset angle value after measuring the speed component v1 of the vehicle 200 to be measured. Therefore, the present utility model is simpler to operate than the prior art. In practical applications, the reference line L2 is projected onto the road surface 300 so that the reference line L2 and the reference line L1 are in the same plane. The positional relationship between the reference line L2 and the reference line L1 is determined through the vertical geometric relationship. Since the reference line L2 has a certain length and extends from the edge of the road surface 300 towards the center of the road surface 300, regardless of whether the speed measurement device 100 is close to or far from the reference line L1, the projected reference line L2 can intersect with the reference line L1, so that the perpendicular relationship between the reference line L1 and the reference line L2 can be judged more accurately, and the installation position of the speed measurement device 100 can be made more flexible.

[0070] From the comparison and analysis of the features between the present utility model and the prior art, on the one hand, the use of a parallel relationship between the reference line and the reference line in the prior art has potential inaccuracies, or rather, a relatively large uncertainty factor. The present utility model adopts the perpendicular relationship between the reference line L2 and the reference line L1, and uses the fact that there will be an intersection relationship between the two, which can reduce the inaccuracy and uncertainty factors of the geometric relationship between the reference line L2 and the reference line L1 to a certain extent.

[0071] On the other hand, compared with the prior art in which the angle is obtained after the gyroscope rotates, for those skilled in the art, during the rotation of the gyroscope, vibrations will be generated. Especially when operating the speed measurement device outdoors, due to the rotation of the gyroscope, the obtained angle value will have deviations. The utility model records the angle value in advance by using the angle recording module 30, which can be directly used by the calculation module 40. There is no need to use the rotation of the gyroscope to obtain the angle value in actual applications, and the problem of angle value deviation caused by the vibration generated by the rotation of the gyroscope can be solved.

[0072] The reference line L1 is a road marking whose direction is the same as the driving direction D2 of the vehicle 200 to be measured. Therefore, the reference line L1 is the same as the driving direction D2 of the vehicle 200 to be measured. Specifically, as Figure 8 , Figure 10 and Figure 11 shown, the above reference line L1 can be the road surface center line L12, the road surface edge line L11, the above reference line L1 can also be the road shoulder L13, etc. The reference line L1 can also be the road surface center isolation belt, and this road surface center isolation belt can refer to the road surface center line L12. The reference line L1 can also be the lane demarcation line. In some cases, each direction of the road surface 300 has multiple lanes. In this case, there is a lane demarcation line between two adjacent same-direction lanes, and this reference line L1 can be the lane demarcation line between the same-direction lanes. Of course, the reference line L1 can also be a specially set marking that is the same as the driving direction D2 of the vehicle 200 to be measured.

[0073] In this embodiment, the speed measurement module 10 is a radar speed measurement module. The radar speed measurement module 10 is used to send electromagnetic waves to the vehicle 200 to be measured and receive the reflected electromagnetic waves, and calculate the speed component v1 of the vehicle 200 to be measured in the detection direction according to the frequency difference between the sent and received electromagnetic waves. In other embodiments, the speed measurement module 10 can also be other types of speed measurement modules that use the Doppler effect for speed measurement, such as a laser speed measurement module, an ultrasonic speed measurement module, etc.

[0074] In this embodiment, as Figure 7 shown, the reference line projection module 20 is a one-line laser. Please refer to Figure 7 and Figure 9 , Figure 7 is the beam structure schematic diagram of the one-line laser. Figure 9Schematic diagram of the beam structure of a general laser. The light emitted by a general laser propagates in a straight line direction, forming a very narrow parallel beam, so the projected spot is a small dot; while the light emitted by a one-line laser propagates along the direction of the light-emitting fan surface. When the projection surface is a plane, the projected spot forms a one-line. This one-line is the intersection line between the light-emitting fan surface formed by the light emitted by the one-line laser and the projected plane. Thus, this one-line can be used as the reference line L2. The schematic diagram of the reference line projection module 20 projecting the reference line L2 on the road surface 300 is as Figure 8 shown. The reference line L2 is perpendicular to the reference line L1. It can be understood that when the road surface center line L12, the road surface edge line L11, and the road shoulder L13 are parallel to each other, the reference line L2 is perpendicular to the road surface center line L12, the road surface edge line L11, and the road shoulder L13.

[0075] It should be noted that Figure 8 、 Figure 10 and Figure 11 the reference line L2 in is exemplary of this application. For the convenience of drawing, Figure 8 、 Figure 10 and Figure 11 only a part of the reference line L2 in is drawn, which does not represent its actual length. In fact, the reference line L2 projected by the reference line projection module 20 can be very long.

[0076] In other embodiments, the reference line projection module 20 can also be a cross-line laser, a projector, or other devices that can project a reference line on the road surface through an optical method.

[0077] In this embodiment, as Figure 6 shown, the angle recording module 30 includes a memory 31, and the memory 31 is electrically connected to the calculation module 40. The memory 31 can store the first included angle β. In other embodiments, the memory 31 can also store the second included angle α.

[0078] In this embodiment, the relative positions of the reference line projection module 20 and the speed measurement module 10 are fixedly set. It can be understood that the two are fixedly connected, that is, the positional relationship between the reference line projection module 20 and the speed measurement module 10 cannot move. The reference line projection module 20 can be directly set on the speed measurement module 10, or indirectly connected to the speed measurement module 10. For example, the speed measurement module 10 and the reference line projection module 20 are fixedly set at different positions on the housing 60 of the speed measurement device 100.

[0079] As Figures 1 to 5As shown, a speed measurement module 10, a reference line projection module 20, an angle recording module 30, and a calculation module 40 are provided on a housing 60. Exemplarily, the housing 60 has a first side 61 and a second side 62 that are oppositely arranged, and the housing 60 further has a top surface 63 and a bottom surface 64 that are oppositely arranged. It should be understood that the bottom surface 64 of the housing 60 is the side close to its placement position, and the top surface 63 of the housing 60 is the side far from its placement position.

[0080] Exemplarily, the speed measurement module 10 is provided on the first side 61 of the housing 60. Exemplarily, the speed measurement module 10 is provided close to the bottom surface 64 of the housing 60.

[0081] Exemplarily, the speed measurement device 100 further includes a camera module 50. The imaging direction of the camera module 50 is consistent with the detection direction D1 of the speed measurement module 10. The camera module 50 is used to capture an image of the vehicle 200 to be measured, so as to match the actual driving speed v of the vehicle 200 to be measured with the vehicle information of the vehicle 200 to be measured. For example, the actually calculated driving speed v of the vehicle 200 to be measured can be displayed on the image of the vehicle 200 to be measured captured by the camera module 50.

[0082] The camera module 50 is provided on the housing 60. Exemplarily, the camera module 50 and the speed measurement module 10 are jointly provided on the first side 61 of the housing 60. Exemplarily, the camera module 50 and the speed measurement module 10 are arranged side by side on the first side 61 of the housing 60, and the speed measurement module 10 is arranged below the camera module 50. It can be understood that the speed measurement module 10 is closer to the bottom surface 64 of the housing 60 than the camera module 50.

[0083] Exemplarily, as Figure 2 and Figure 6 shown, the speed measurement device 100 further includes a display module 70. The display module 70 is communicatively connected to the calculation module 40. The display module 70 is used to display the actual driving speed v of the vehicle 200 to be measured. Exemplarily, the display module 70 is provided on the second side 62 of the housing 60 that is oppositely arranged to the first side 61, so that the display module 70 is oppositely arranged to the speed measurement module 10 and the camera module 50 on the housing 60. The display module 70 can also be electrically connected to the camera module 50 to display the image of the vehicle 200 to be measured captured by the camera module 50.

[0084] Exemplarily, the housing 60 further includes a first end face 65 and a second end face 66 that are oppositely arranged. The first end face 65 and the second end face 66 are both connected between the first side 61 and the second side 62. The first end face 65, the second end face 66, the first side 61, and the second side 62 are all connected between the top surface 63 and the bottom surface 64.

[0085] Exemplarily, at the connection positions of the housing 60 between the first end face 65 and the top face 63, and between the second end face 66 and the top face 63, there are provided gripping portions 67 for a user to grip, so as to facilitate the movement of the speed measurement device 100.

[0086] Exemplarily, the housing 60 is provided with a plurality of support feet 80 on the bottom face 64, and the support feet 80 are used to support the housing 60 and other components of the speed measurement device 100. Exemplarily, one support foot 80 is disposed adjacent to the first reference line projection module 20a, and the first reference line projection module 20a is closer to the first end face 65 of the housing 60 than the support foot 80 adjacent to it. Another support foot 80 is disposed adjacent to the second reference line projection module 20b, and the second reference line projection module 20b is closer to the second end face 66 of the housing 60 than the support foot 80 adjacent to it.

[0087] Exemplarily, the housing 60 is provided with bracket mounting holes 90 on the bottom face 64, and the bracket mounting holes 90 are used to mount the speed measurement device 100 onto a bracket. Exemplarily, the bracket mounting holes 90 are located at the central position of the bottom face 64.

[0088] Before using the speed measurement device 100 to measure the speed of the vehicle 200 to be measured, the speed measurement device 100 can be mounted beside the road surface 300 using a bracket, and the bracket enables the speed measurement device 100 to rotate about an axis in the vertical direction, so that the detection direction D1 of the speed measurement module 10 can be deflected. Since the positional relationship between the reference line projection module 20 and the speed measurement module 10 is fixed, when adjusting the deflection angle of the speed measurement module 10, the direction of the reference line L2 projected by the reference line projection module 20 on the road surface 300 will also deflect accordingly.

[0089] Before using the speed measurement device 100 to measure the speed of the vehicle 200 to be measured, first adjust the deflection angle of the speed measurement module 10 so that the reference line L2 projected by the reference line projection module 20 is perpendicular to the reference line L1. It can be visually judged whether the reference line L2 is perpendicular to the reference line L1, or it can also be detected whether the reference line L2 is perpendicular to the reference line L1 using measuring tools such as a protractor. For example Figure 10As shown, when the reference line L2 is perpendicular to the reference line L1, that is, the reference line L2 is perpendicular to the driving direction D2 of the vehicle 200 to be measured. Thus, the driving direction D2 of the vehicle 200 to be measured, the reference line L2, and the detection direction D1 of the speed measurement module 10 form a right triangle. There is a first included angle β between the reference line L2 and the detection direction D1, and the included angle between the reference line L2 and the driving direction D2 of the vehicle 200 to be measured is a right angle. The complementary angle of the first included angle β is the second included angle α between the detection direction D1 and the driving direction D2 of the vehicle 200 to be measured. When the value of the first included angle β is determined, the value of the second included angle α is also determined. The values of the first included angle β and / or the second included angle α can be stored in the memory 31 in advance.

[0090] After adjusting the reference line L2 to be perpendicular to the reference line L1, the vehicle 200 to be measured can be speed-measured by the speed measurement module 10. During the speed measurement process, the speed measurement module 10 detects the speed component v1 of the vehicle 200 to be measured in the detection direction D1. The calculation module 40 obtains the speed component v1 of the vehicle 200 to be measured in the detection direction D1 through the speed measurement module 10 and obtains the first included angle β between the reference line L2 and the detection direction D1 through the memory 31, and then calculates the actual driving speed v of the vehicle 200 to be measured through the formula v = v1 / sinβ. Of course, the calculation module 40 also obtains the speed component v1 of the vehicle 200 to be measured in the detection direction D1 through the speed measurement module 10 and obtains the second included angle α between the detection direction D1 and the driving direction D2 of the vehicle 200 to be measured through the memory 31, and then calculates the actual driving speed v of the vehicle 200 to be measured through the formula v = v1 / cosα. Since the first included angle β and the second included angle α are complementary angles, the formula v = v1 / sinβ can be transformed into the formula v = v1 / sin(90° - α), and the formula v = v1 / cosα can be transformed into v = v1 / cos(90° - β).

[0091] It should be noted that the driving direction D2 of the vehicle 200 to be measured includes the going direction D21 and the coming direction D22. Figure 9 Schematically shows the actual driving speed v of the vehicle 200 to be measured during the driving process in the going direction D21. It should be understood that the actual driving speed v of the vehicle 200 to be measured during the driving process in the coming direction D22 can be measured by using the speed measurement device 100 in the same way. This embodiment only takes the speed measurement of the oncoming vehicle as an example for illustration. The principle of speed measurement for the vehicle going in the other direction is basically the same as that for the oncoming vehicle, and will not be elaborated here.

[0092] Exemplarily, the reference line projection module 20 can be one or more.

[0093] Exemplarily, such as Figure 4 and Figure 10As shown, the reference line projection module 20 includes a first reference line projection module 20a and a second reference line projection module 20b. The first reference line projection module 20a can project and form a first reference line L21 on the road surface 300, and the second reference line projection module 20b can project and form a second reference line L22 on the road surface 300. The first reference line projection module 20a and the second reference line projection module 20b are arranged at both ends of the bottom surface 64 of the housing 60. Specifically, the first reference line projection module 20a is close to the first end surface 65, and the second reference line projection module 20b is close to the second end surface 66.

[0094] Exemplarily, the first reference line L21 projected by the first reference line projection module 20a on the road surface 300 is symmetric with the second reference line L22 projected by the second reference line projection module 20b on the road surface 300 along the detection direction D1 of the speed measurement module 10.

[0095] The angles formed between the first reference line L21 and the detection direction D1 and between the second reference line L22 and the detection direction D1 are between 65° and 75°. Specifically, the angles formed between the first reference line L21 and the detection direction D1 and between the second reference line L22 and the detection direction D1 can both be 65°. Preferably, the first reference line L21 and the second reference line L22 are symmetric along the detection direction D1, which is convenient for measuring the speed of the measured vehicle 200 in different directions to adapt to more usage scenarios.

[0096] The angle between the vehicle traveling direction and the detection direction can be between 15° and 25°, preferably 25°; therefore, the angle between the one-line direction and the detection direction can be between 65° and 75°, preferably 65°.

[0097] Exemplarily, the bottom surface 64 of the housing 60 is provided with a first groove 641 for placing the first reference line projection module 20a and a second groove 642 for placing the second reference line projection module 20b; the first reference line projection module 20a is arranged in the first groove 641 without protruding from the bottom surface 64 of the housing 60, and the second reference line projection module 20b is arranged in the second groove 642 without protruding from the bottom surface 64 of the housing 60.

[0098] Exemplarily, the first reference line projection module 20a and the second reference line projection module 20b are close to the first side surface 61 of the housing 60, and the first reference line projection module 20a and the second reference line projection module 20b are close to both ends of the first side surface 61 of the housing 60 to avoid being blocked; the speed measurement module 10 is disposed adjacent to the first reference line projection module 20a and the second reference line projection module 20b, and at least a part of the speed measurement module 10 is located between the first reference line projection module 20a and the second reference line projection module 20b, so that the detection direction D1 of the speed measurement module 10 is maintained between the first reference line L21 and the second reference line L22, specifically as Figure 11 shown.

[0099] As Figure 11 shown, when it is necessary to measure the speed of the vehicle 200 to be measured in the incoming direction D21, the speed measurement device 100 is disposed outside the road surface 300, and the deflection angle of the speed measurement device 100 is adjusted until the first reference line L21 is perpendicular to the reference line L1. When it is necessary to measure the speed of the vehicle 200 to be measured in the outgoing direction D22, the speed measurement device 100 is disposed outside the road surface 300, and the deflection angle of the speed measurement device 100 is adjusted until the second reference line L22 is perpendicular to the reference line L1. When there is a median strip in the middle of the road surface 300, the speed measurement device 100 can also be disposed on the median strip for speed measurement. When it is necessary to measure the speed of the vehicle 200 to be measured in the incoming direction D21, the deflection angle of the speed measurement device 100 is adjusted until the second reference line L22 is perpendicular to the reference line L1. When it is necessary to measure the speed of the vehicle 200 to be measured in the outgoing direction D22, the deflection angle of the speed measurement device 100 is adjusted until the first reference line L21 is perpendicular to the reference line L1. Thus, the speed measurement device 100 of the present utility model can measure the speed of the vehicle 200 to be measured in the incoming direction D21 and can also measure the speed of the vehicle 200 to be measured in the outgoing direction D22, and the corresponding first reference line projection module 20a or second reference line projection module 20b can be enabled according to the use scenario.

[0100] Specifically, as Figure 11 shown, the actual traveling speed v of the vehicle 200 to be measured in the incoming direction D21 measured by the speed measurement device 100 can refer to Figure 10 and the above content, which will not be elaborated here. It should be noted that, Figure 11 the first reference line L21 shown can refer to Figure 10 the reference line L2 shown.

[0101] Specifically, as Figure 11As shown, when the speed measurement device 100 measures the actual driving speed v' of the vehicle 200 going in the direction D22, after adjusting the second reference line L22 to be perpendicular to the reference line L1, the speed of the vehicle 200 to be measured can be measured by the speed measurement module 10. During the speed measurement process, the speed measurement module 10 detects the speed component v1' of the vehicle 200 to be measured in the detection direction D1'. The calculation module 40 obtains the speed component v1' of the vehicle 200 to be measured in the detection direction D1' through the speed measurement module 10 and obtains the first included angle β' between the second reference line L22 and the detection direction D1' through the memory 31 to calculate the vehicle 200 to be measured, and then calculates the actual driving speed v' of the vehicle 200 to be measured through the formula v' = v1' / sinβ'. Of course, the calculation module 40 also obtains the speed component v1' of the vehicle 200 to be measured in the detection direction D1' through the speed measurement module 10 and obtains the second included angle α' between the detection direction D1' and the direction D22 of the vehicle 200 to be measured through the memory 31, and then calculates the actual driving speed v' of the vehicle 200 to be measured through the formula v' = v1' / cosα'.

[0102] The speed measurement device provided by the embodiments of the present application has been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A speed measuring device (100), characterized in that, For measuring the driving speed of the vehicle under test (200) traveling on the road surface (300), a reference line (L1) is provided on the road surface (300) that is consistent with the traveling direction (D2) of the vehicle under test. The speed measuring device (100) includes: A speed measuring module (10), a reference line projection module (20), an angle recording module (30), and a calculation module (40). The speed measuring module (10) and the angle recording module (30) are electrically connected to the calculation module (40); The reference line projection module (20) is configured to project and form a reference line (L2) on the road surface (300); The relative positions of the reference line projection module (20) and the speed measuring module (10) are fixedly set such that a first included angle (β) is formed between the reference line (L2) and the detection direction (D1) of the speed measuring module (10); The angle recording module (30) is used to record the first included angle (β); When the reference line (L2) is perpendicular to the reference line (L1), the calculation module (40) is configured to calculate the actual driving speed (v) of the vehicle under test (200) based on the first included angle (β) obtained from the angle recording module (30).

2. The speed measurement device according to claim 1, characterized in that, The speed measuring module (10) is one of: A radar speed measuring module, a laser speed measuring module, and an ultrasonic speed measuring module.

3. The speed measurement device according to claim 1, characterized in that, The reference line projection module (20) is one of: A one-line laser, a cross-line laser, and a projector.

4. The speed measuring device according to claim 1, characterized in that It further includes a camera module (50). The imaging direction of the camera module (50) is consistent with the detection direction (D1). The camera module (50) is used to capture an image of the vehicle under test (200).

5. The speed measurement device according to claim 1, characterized in that, It further includes a display module (70) communicatively connected to the calculation module (40). The display module (70) is used to display the actual driving speed (v).

6. The speed measurement device according to claim 1, characterized in that, It further includes a housing (60); The speed measuring module (10), the reference line projection module (20), the angle recording module (30), and the calculation module (40) are arranged on the housing (60).

7. The speed measurement device according to claim 1, wherein It further includes a camera module (50), a housing (60), and a display module (70); The imaging direction of the camera module (50) is consistent with the detection direction (D1). The camera module (50) is used to capture an image of the vehicle under test (200); The display module (70) is communicatively connected to the calculation module (40) and is used to display the actual driving speed (v); The speed measuring module (10) and the camera module (50) are jointly arranged on the first side surface (61) of the housing (60); The reference line projection module (20) is arranged on the bottom surface (64) of the housing (60); The display module (70) is arranged on the second side surface (62) of the housing (60) that is opposite to the first side surface (61), such that the display module (70) is relatively arranged with the speed measuring module (10) and the camera module (50) on the housing (60).

8. The speed measuring device according to claim 1, characterized in that The reference line projection module (20) includes a first reference line projection module (20a) and a second reference line projection module (20b). The first reference line projection module (20a) is capable of projecting and forming a first reference line (L21) on the road surface (300), and the second reference line projection module (20b) is capable of projecting and forming a second reference line (L22) on the road surface (300).

9. The speed measurement device according to claim 8, characterized in that, It further includes a housing (60). A first groove (641) for placing the first reference line projection module (20a) and a second groove (642) for placing the second reference line projection module (20b) are formed in the bottom surface (64) of the housing (60). The first reference line projection module (20a) is disposed in the first groove (641) and does not protrude from the bottom surface (64) of the housing (60), and the second reference line projection module (20b) is disposed in the second groove (642) and does not protrude from the bottom surface (64) of the housing (60).

10. The speed measuring device according to claim 8, wherein The first reference line (L21) projected by the first reference line projection module (20a) on the road surface (300) is symmetrical to the second reference line (L22) projected by the second reference line projection module (20b) on the road surface (300) along the detection direction (D1) of the speed measurement module (10).

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