CN211697864U - Simple motor vehicle speed detector calibrating device - Google Patents
Simple motor vehicle speed detector calibrating device Download PDFInfo
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- CN211697864U CN211697864U CN202020443252.2U CN202020443252U CN211697864U CN 211697864 U CN211697864 U CN 211697864U CN 202020443252 U CN202020443252 U CN 202020443252U CN 211697864 U CN211697864 U CN 211697864U
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Abstract
The application discloses simple and easy type motor vehicle speed detector calibrating device sets up a cavity stand pipe along vertical direction between two beam transmitter and two beam receiver, is equipped with first light trap, the second light trap that supplies the light beam of two beam transmitter transmission to pass along its axial vertically direction on the cavity stand pipe, and the test piece is from cavity stand pipe top free fall, through two light beams in proper order. The application provides a calibrating device simple structure, utilize the running state of test piece free fall simulation motor vehicle on the road, can calibrate the operation in the workshop laboratory, according to test piece motion stroke and the time through two detection light beams, calculate the speed and the acceleration of test piece in each stage, compare with the acceleration theoretical value of test piece through each stage again, obtain the acceleration calibration coefficient, the convenience carries out real-time calibration and demarcation to the motor vehicle speed detector of production, it is convenient to provide for the research and development production of road motor vehicle speed detector.
Description
Technical Field
The application relates to the technical field of optical electromechanical devices, in particular to a simple motor vehicle speed detector calibrating device.
Background
The road motor vehicle speed detector is a special instrument device designed for a road motor vehicle tail gas detection system in a matching way, and provides real-time and high-precision motor vehicle running speed and acceleration values for motor vehicle tail gas emission monitoring points. In a road detection site, besides the amount of the tail gas emission of the motor vehicle, the running speed, particularly the parameter values such as the acceleration and the like of the motor vehicle passing through a monitoring point are detected, and the comprehensive conclusion that the tail gas emission of the motor vehicle is qualified or unqualified is obtained by combining the speed and the acceleration change condition of the motor vehicle, so that reference is provided for road environment monitoring.
The road motor vehicle speed detector can be put into use after being debugged and calibrated generally, the production and calibration processes of the existing road motor vehicle speed detector are complex, the consumed period is long, how to realize the debugging and calibration of the detector in real time and high efficiency is the problem to be solved in the research and development and product batch production processes of the road motor vehicle speed detector.
Content of application
The utility model provides a simple and easy motor vehicle speed detector calibrating device aims at improving detection, the calibration efficiency of motor vehicle speed detector.
In order to achieve the above object, the utility model provides a simple and easy type motor vehicle speed detector calibrating device is applied to the calibration of road motor vehicle speed detector, include:
two light beam emitters: the two light beam emitters emit light beams along the horizontal direction, and the two light beam emitters are arranged along the vertical direction;
the two light beam receivers are arranged in one-to-one correspondence with the two light beam transmitters;
the hollow guide tube is arranged between the two light beam transmitters and the two light beam receivers along the vertical direction, a first light-transmitting hole and a second light-transmitting hole are formed in the hollow guide tube along the axial vertical direction, and light beams emitted by the two light beam transmitters respectively penetrate through the first light-transmitting hole and the second light-transmitting hole and are received by the two light beam receivers;
the test piece falls into in the cavity stand pipe along vertical direction, shelters from two in proper order the light beam of light beam transmitter transmission for the simulation motor vehicle passes through the running state of speed of a motor vehicle detector.
The effects in the above embodiment are: the speed and acceleration change conditions in the running process of the motor vehicle are simulated through the free falling process of the test piece. In the calibration process, the time difference value of the test piece when the test piece moves to shield and release the two light beams is measured, the theoretical speed and the acceleration of the test piece when the test piece passes through the two light beams are solved according to the motion equation of the test piece, the theoretical speed and the acceleration are compared with the speed measured by the motor vehicle speed measuring instrument, and the speed and the acceleration calculated by the theory are used for calibrating and calibrating the motor vehicle speed detector in real time.
Optionally, the distance between two light beams emitted by the two light beam emitters is equal to the distance between the first light-transmitting hole and the second light-transmitting hole, and the distance ranges from 50cm to 70 cm.
The effects in the above embodiment are: ensuring that the two light beams can smoothly pass through the two groups of light holes; the distance between the two light beams is equal to the distance between the two groups of light holes, so that the distance between the two light beams and the distance between the two light holes can be conveniently and synchronously adjusted.
Optionally, the length of the test piece ranges from 23cm to 70cm, and the length of the hollow guide tube ranges from 2.0m to 3.0 m; the first light hole is arranged above the second light hole, and the distance range from the first light hole to the top end of the hollow guide tube is 1/2-2/3 of the length of the hollow guide tube.
The effects in the above embodiment are: the test piece is ensured to have enough movement stroke when passing through the two light holes, and meanwhile, the operation convenience is not influenced by the overlong movement stroke.
Optionally, the diameters of the first light transmission hole and the second light transmission hole are both set to be 10 cm.
The effects in the above embodiment are: the light beam can conveniently pass through the light hole, and the light path range of the light beam can be conveniently adjusted.
Optionally, the test piece is a tubular test piece, and the inner diameter of the hollow guide tube is larger than the outer diameter of the tubular test piece.
The effects in the above embodiment are: the friction between the test piece and the pipe wall in the falling process is prevented, and the motion state of the test piece is prevented from being influenced.
Optionally, the inner diameter of the hollow guide pipe is 45cm, and the outer diameter of the tubular test piece is 40 cm.
The effects in the above embodiment are: the test piece can freely fall from the hollow guide tube under the specification.
Optionally, the calibration device further comprises a mounting assembly for ensuring that the test piece falls freely.
The effects in the above embodiment are: the auxiliary test piece freely falls down, the height of the test piece when freely falling down is conveniently adjusted, and then the speed of the test piece when passing through the two light holes is adjusted.
Optionally, the test piece is an iron test piece, and the hollow guide tube is a plastic hollow guide tube;
the mounting assembly comprises an electromagnet arranged above the hollow guide pipe, and the test piece is vertically adsorbed on the electromagnet; the mounting assembly further comprises a displacement driving mechanism used for adjusting the position of the test piece along the vertical direction, and the electromagnet is mounted at the driving end of the displacement driving mechanism.
The effects in the above embodiment are: the iron test piece is adsorbed by the electromagnet, and the hollow guide pipe is a plastic hollow guide pipe, so that the electromagnet does not influence the adsorption of the test piece; after the electromagnet is desorbed, the test piece freely falls, and meanwhile, the iron test piece is hollow and has enough gravity, and the interference factors caused by external acting force such as air friction and the like are small; the test piece and the electromagnet are both arranged at the driving end of the displacement driving mechanism, so that the installation heights of the test piece and the electromagnet can be conveniently and synchronously adjusted.
Optionally, the displacement driving mechanism includes an electric screw rod lifter arranged along the vertical direction, and the electromagnet is mounted at the driving end of the electric screw rod lifter through a mounting plate.
The effects in the above embodiment are: the electric screw rod lifter can drive the test piece and the electromagnet to stably move along the vertical direction.
Optionally, the lower end of the test piece is arranged at the inlet of the upper end of the hollow guide tube.
The effects in the above embodiment are: the convenient counterpoint ensures that the test piece accurately falls into the cavity stand pipe.
The calibration device for the road motor vehicle speed detector has the advantages that the hollow guide pipe is arranged between the two light beam transmitters and the two light beam receivers along the vertical direction, the test piece is moved to the position above the hollow guide pipe to release the test piece, the test piece freely falls down to sequentially pass through the two light beams, the running state of a motor vehicle on a road is simulated by utilizing the free fall of the test piece, the calibration device has simple structure, and can carry out calibration operation in a workshop laboratory, the speed and the acceleration of the test piece in each stage are calculated according to the motion stroke of the test piece and the time of passing through the two detection light beams, and then the speed and the acceleration are compared with the theoretical value of the acceleration of the test piece in each stage to obtain an acceleration calibration coefficient, so that the produced motor vehicle speed detector can be conveniently calibrated and calibrated in real time, and convenience is provided for the research and development of the road motor vehicle speed detector.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a front view of a calibration device for a simplified motor vehicle speed detector according to the present application;
FIG. 2 is a diagram showing a movement state of the lower end of the test piece blocking the first beam of light through the first light hole;
FIG. 3 is a diagram showing a motion state of the lower end of the test piece blocking the second beam of light through the second light hole;
FIG. 4 is a diagram showing the state of motion of the upper end of the test piece of the present application releasing a first beam of light through a first light hole;
FIG. 5 is a diagram showing the movement of the upper end of the test piece through the second light hole to release the second beam of light.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The utility model provides a simple and easy type motor vehicle speed detector calibrating device is applied to the calibration of road motor vehicle speed detector, and wherein motor vehicle speed detector is a setting in the road both sides for detect the device through detecting highway section vehicle speed and acceleration, with monitoring road vehicle running state. Before putting into motor vehicle speed detector into road use, or after putting into service a period, all need its calibration to ensure motor vehicle speed detector testing result's accuracy, the utility model provides a simple and easy motor vehicle speed detector calibrating device, specifically, as shown in fig. 1, include:
two-beam emitter 100: the two light beam emitters 100 emit light beams along the horizontal direction, and the two light beam emitters 100 are arranged along the vertical direction;
two light beam receivers 200, wherein the two light beam receivers 200 and the two light beam transmitters 100 are arranged in a one-to-one correspondence manner;
the hollow guide tube 300 is arranged between the two light beam emitters 100 and the two light beam receivers 200 along the vertical direction, a first light hole 301 and a second light hole 302 are arranged on the hollow guide tube 300 along the axial vertical direction, and light beams emitted by the two light beam emitters 100 respectively pass through the first light hole 301 and the second light hole 302 and are received by the two light beam receivers 200;
the test piece 400 falls into the hollow guide tube 300 along the vertical direction, and the test piece 400 shields the light beams emitted by the light beam emitters 100 in sequence and is used for simulating the running state of a motor vehicle passing through the vehicle speed detector.
Before the calibration is started, the installation positions of the two light beam transmitters 100 and the two light beam receivers 200 are adjusted, so that the two light beam transmitters 100 emit light beams in the horizontal direction, and the two light beams are emitted to the two light beam receivers side by side in the vertical direction and are accurately received by the two light beam receivers. The hollow guiding tube 300 is installed between the two light beam emitters 100 and the two light beam receivers 200, the hollow guiding tube 300 is fixedly installed on an installation support 600, and the installation position of the hollow guiding tube 300 is adjusted so that the two light beams emitted by the two light beam emitters 100 can respectively pass through the first light-transmitting hole 301 and the second light-transmitting hole 302 of the hollow guiding tube 300. Then, the test piece 400 is moved to the upper side of the hollow guide tube 300, so that the test piece 400 is in a vertical state, and the position of the test piece 400 is adjusted, so that the test piece 400 falls into the hollow guide tube 300 and does not contact with the wall of the hollow guide tube 300.
To ensure that the two light beams can smoothly pass through the first light hole 301 and the second light hole 302, the distance between the two light beams is preferably equal to the distance between the two light holes, so that the distance between the two light beams and the distance between the first light hole 301 and the second light hole 302 can be conveniently and synchronously adjusted. And during calibration, the test piece 400 needs to have enough movement stroke when passing through the two detection light beams, so as to conveniently detect the time and speed change condition of the test piece 400 when passing through the two light beams, in this embodiment, the distance between the two light beams emitted by the two light beam emitters 100 is equal to the distance between the first light transmission hole 301 and the second light transmission hole 302, the two distance ranges are both set to be 50cm-70cm, for example, the distances are set to be 50cm, 60cm and 70cm, and the specific distance can be adjusted according to the length of the test piece 400, the length of the hollow guide tube 300, the diameter of the first light transmission hole 301 and the diameter of the second light transmission hole 302.
Alternatively, the test piece 400 may have a length ranging from 23cm to 70cm, for example, the test piece 400 may have a length of 23cm, 50cm, or 70cm, and the hollow guide tube 300 may have a length ranging from 2.0m to 3.0m, for example, the hollow guide tube 300 may have a length of 2.0m, 2.5m, or 3.0 m. The first light hole 301 on the hollow guide tube 300 is disposed above the second light hole 302, and the distance from the first light hole 301 to the top end of the hollow guide tube 300 is 1/2-2/3 of the length of the hollow guide tube 300, for example, the distance from the first light hole 301 to the top end of the hollow guide tube 300 is 1/2, 2/3 of the length of the hollow guide tube 300, so that the test piece 400 has sufficient movement stroke when passing through the first light hole 301, and the position of the second light hole 302 is conveniently designed according to the position of the first light hole 301.
During calibration, the two light beams and the axes of the first light transmission hole 301 and the second light transmission hole 302 may be allowed to be in the same line or not, specifically, the two light beams may pass through the first light transmission hole 301 and the second light transmission hole 302 without obstruction, in this embodiment, the first light transmission hole 301 and the second light transmission hole 302 are both circular light transmission holes, and the diameters of the first light transmission hole 301 and the second light transmission hole 302 are both set to be 10cm, and under the diameters, the two light beams may pass through the first light transmission hole 301 and the second light transmission hole 302 smoothly without causing the light beams to pass due to too small aperture, and the apertures may occupy installation space too large.
Optionally, the test piece 400 is a tubular test piece 400, the inner diameter of the hollow guide tube 300 is larger than the outer diameter of the tubular test piece 400, and the inner wall surface of the hollow guide tube 300 and the outer wall surface of the test piece 400 are straight and smooth, so that the test piece 400 is prevented from rubbing with the tube wall in the falling process to influence the motion state of the test piece 400. Specifically, the inner diameter of the hollow guide tube 300 was 45cm, and the outer diameter of the tubular test piece 400 was 44cm, at which specification the test piece 400 could freely fall from the hollow guide tube 300.
The utility model discloses a mainly utilize object free fall acceleration unchangeable, simulate the acceleration change condition among the car operation process. The bigger its self gravity of test piece 400 is in the in-process that falls, receives the influence of external effort such as air friction etc. to speed the less, in this embodiment, test piece 400 is iron test piece 400, and cavity stand pipe 300 is plastics cavity stand pipe 300, puts test piece 400 for the convenience, and calibrating device is still including being used for guaranteeing the installation component 500 that test piece 400 freely falls takes into account the height when adjustment test piece 400 freely falls simultaneously, and then the speed when adjustment test piece 400 passes through two light traps.
Specifically, the installation assembly 500 includes an electromagnet 501 disposed above the hollow guide tube 300, the test piece 400 is vertically adsorbed on the electromagnet 501, and after desorption of the electromagnet 501, the iron test piece 400 freely falls down into the hollow guide tube 300. The mounting assembly 500 further comprises a displacement driving mechanism 502 for adjusting the position of the test piece 400 along the vertical direction, and the electromagnet 501 is mounted at the driving end of the displacement driving mechanism 502, so that the mounting heights of the test piece 400 and the electromagnet 501 can be conveniently and synchronously adjusted, and the speed of the test piece 400 passing through the two light beams can be further adjusted.
In order to consider the convenience and stability of the displacement driving mechanism 502 to move the electromagnet 501 and the test piece 400, in this embodiment, the displacement driving mechanism 502 includes an electric screw rod lifter arranged along the vertical direction, the electric screw rod lifter is mounted on the mounting bracket 600, the electromagnet 501 is mounted at the driving end of the electric screw rod lifter through a mounting plate, the rear end control system controls the electric screw rod to operate, the test piece 400 is driven to move up and down stably along the vertical direction, and the mounting height of the test piece 400 is adjusted.
The displacement driving mechanism 502 drives the test piece 400 to move up and down, the position of the test piece 400 is too high, the occupied space of the equipment is large in the operation process, and the position of the test piece 400 is too low, so that the operation is relatively troublesome. In this embodiment, the lower end of the testing part 400 is adjusted at the inlet 303 of the upper end of the hollow guiding tube 300, so as to facilitate alignment and ensure that the testing part 400 accurately falls into the hollow guiding tube 300.
When calibration is started, the test piece 400 is adjusted to a preset height, the test piece 400 is loosened, the test piece 400 freely falls into the hollow guide tube 300, and after two lights are shielded in sequence, the test piece 400 penetrates out from the outlet 304 at the lower end of the test piece 400, and the speed and acceleration change conditions of the motor vehicle in the road running process are simulated by utilizing the condition that the acceleration of the test piece 400 is unchanged in the free falling process. As shown in fig. 2 to 4, observing the motion state of the test piece 400 during the whole free-falling motion process, and recording the motion data of each falling stage, specifically includes: time t at which test piece 400 starts to fall0The time that the lower end of the test piece 400 shields the first beam of light through the first light hole 301t1The time t when the lower end of the test piece 400 shields the second beam of light through the second light hole 3022The time t for the upper end of the test piece 400 to release the first beam of light through the first light-transmitting hole 3013The time t when the upper end of the test piece 400 passes through the second light hole 302 to release the second beam of light4And the length L of the test piece 4001The free fall movement distance L of the test piece 4002Distance L between two light beam centers3。
Data analysis was then performed as follows:
the test piece 400 blocks the first beam of light and is t when the first beam of light is released31＝t3-t1The average speed in the stroke is v31＝LI/(t3-t1) And t is the time when the test piece 400 shields the second beam of light and releases the second beam of light42＝t4-t2The average speed in the stroke is v42＝LI/(t4-t2) Thus, the average speed of the test piece 400 passing through the two beams is V ═ V (V ═ V)31+v42) /2, the time t for the test piece 400 to shield the first beam of light and the second beam of light in sequence21＝t2-t1The time t for the test piece 400 to release the first beam of light and the second beam of light in sequence43＝t4-t3The average time t (t) of the test piece 400 passing through the two light beams is obtained21+t43) 2, so that the average acceleration a of the test piece 400 passing through the first beam of light and the second beam of light0＝(v42-v31) T, repeated calibration tests can be carried out for multiple times to obtain multiple groups of acceleration values a0The acceleration of the test piece 400 is the gravity acceleration g in the free falling process, the acceleration is fixed and can be compared with the actually measured acceleration value through the theoretical acceleration value to obtain an acceleration calibration coefficient k, wherein k is g/△ a', therefore, when the calibrated motor vehicle speed detector is applied to road speed detection, when the acceleration measured by the system is a, the acceleration true value A actually output by the system is A, k is a, wherein the speed is defined as the ratio of the displacement of an object to the time used for generating the displacement, namely the speedThe degree can be obtained by displacement and the time for generating the displacement, and the speed is not considered to be corrected in the embodiment.
When the motor vehicle speed detector is applied to real-time detection of road speed, the body length L' of the motor vehicle to be detected is unknown1The initial speed value of the motor vehicle when reaching the monitoring point is not known, but the motor vehicle velocimeter can detect the time value t' of the motor vehicle passing through two light beams of the monitoring point in real time1、t`2、t`3、t`4I.e. the time t' for the front end of the motor vehicle to shield the first beam of light1The time t' for the front end of the motor vehicle to shield the second beam of light2Time t' for releasing the first beam of light at the rear end of the motor vehicle3Time t' for releasing the second beam of light at the rear end of the motor vehicle4. Because of the two beam spacing L ″3The time t' from the first beam of light to the second beam of light is known to be blocked by the locomotive21＝t`2-t`1And the time t' from the tail of the vehicle releasing the first light to the second light43＝t`4-t`3The average speed v' of the motor vehicle moving between the two beams can be determined, where v ═ L ″, in3/t`21+L`3/t`43) (v 2) passing the average velocity v ', and then according to the time t' of the vehicle for shielding the first light and releasing the first light31＝t`3-t`1And the time t' for shielding the second beam of light and releasing the second beam of light42＝t`4-t`2The average time t' of the motor vehicle passing through the two light beams is determined, wherein t ═ t ″31+t`42) /2, the average length of the motor vehicle, namely L ″, can be determined1V't'. Finally, the speed v' of the motor vehicle passing through the first beam of light can be obtained1＝L`1/(t`3-t`1) The speed v' of the motor vehicle passing through the second beam2＝L`1/(t`4-t`2) According to v ″, again1、v`2Determining the acceleration a of the vehicle passing the monitoring point, i.e. the acceleration a measured by the system, wherein a ═ v ″2-v`1)*2/(t`21+t`43) And then correcting the acceleration according to the acceleration calibration coefficient k obtained by calibration to obtain the accelerationThe truth value a is k a.
The working principle of the calibration device for the simple motor vehicle speed detector provided by the present application is specifically described below with reference to an embodiment of the present application.
In this embodiment, the test piece 400 is an iron tubular test piece, and has a length of 23cm, an inner diameter of 36cm, and an outer diameter of 40 cm; the hollow guide tube 300 is a plastic hollow guide tube 300, and has a length of 1.4m, an inner diameter of 45cm and an outer diameter of 50 cm; the hollow guide tube 300 is respectively provided with a first light hole 301 and a second light hole 302 with the inner diameters of 10cm along the length direction of the hollow guide tube, the distances from the axes of the first light hole 301 and the second light hole 302 to the top end of the hollow guide tube 300 are respectively 0.7m and 1.4m, the hollow guide tube 300 is arranged between the two light beam transmitters 100 and the two light beam receivers 200 along the vertical direction, two light beams emitted by the two light beam transmitters 100 respectively pass through the first light hole 301 and the second light hole 302 along the horizontal direction, and then are respectively received by the two light beam receivers 200. The electromagnet 501 adsorbs the test piece 400, the lower end of the test piece 400 is adjusted to be arranged at the inlet 303 at the upper end of the hollow guide tube 300, then the electromagnet 501 naturally puts down the test piece 400, and the system records the time t when the lower end of the test piece 400 shields the first beam of light through the first light-transmitting hole 3011The time t when the lower end of the test piece 400 shields the second beam of light through the second light hole 3022The time t for the upper end of the test piece 400 to release the first beam of light through the first light-transmitting hole 3013The time t when the upper end of the test piece 400 passes through the second light hole 302 to release the second beam of light4。
During actual measurement, the time t for the lower end of the test piece 400 to shield the first beam of light through the first light hole 3011Is the starting point of the timing, i.e. t1The time for 5 groups of test pieces 400 to pass each position during the fall is recorded in table 1 as 0 seconds:
TABLE 1
| Serial number | t1 | t2 | t3 | t4 |
| 1 | 0 | 0.16280186 | 0.06080916 | 0.20652900 |
| 2 | 0 | 0.16251706 | 0.06106146 | 0.20639953 |
| 3 | 0 | 0.16239512 | 0.06038446 | 0.20597418 |
| 4 | 0 | 0.16274722 | 0.06074050 | 0.20642216 |
| 5 | 0 | 0.16236640 | 0.06054176 | 0.20598256 |
As is known, the test piece 400 has a length L1Is 0.23m, and the free fall movement distance L of the test piece 4002Is 0.70m and the center distance L between the two beams3Is 0.50m, and t is the time when the test piece 400 shields the first beam of light and releases the first beam of light31＝t3-t1The velocity v of the test piece 400 passing through the first beam of light31＝L1/(t3-t1) And t is the time when the test piece 400 shields the second beam of light and releases the second beam of light42＝t4-t2The velocity v of the test piece 400 passing through the second beam of light42＝L1/(t4-t2) So that the average speed V ═ V (V) of the test piece 400 passing between the two beams31+v42) /2, velocity variation value V0Is v is42-v31On the other hand, the test piece 400 sequentially blocks the first beam of light and the second beam of light for a time t21＝t2-t1The time t for the test piece 400 to release the first beam of light and the second beam of light in sequence43＝t4-t3The average time of the test piece 400 after the first and second light beams is t ═ t (t ═ t-21+t43) 2, so that the average acceleration a of the test piece 400 passing through the first beam of light and the second beam of light0＝(v42-v31) T is calculated. Tables 3 and 4 show the average velocity v and the acceleration a of the test piece 400 passing between the two light beams according to the 5 sets of test data measured in table 10The value is obtained.
TABLE 2
According to the results of the experiments in Table 2, the average speed of the test piece 400 passing between the two light beams was 4.52787 m/s.
TABLE 3
| Serial number | t21＝t2-t1 | t43＝t4-t3 | V0＝v42-v31 | t＝(t21+t43)/2 | a0＝(v42-v31)/t |
| 1 | 0.16280186 | 0.14571174 | 1.47757 | 0.15425680 | 9.5786 |
| 2 | 0.16251706 | 0.14533807 | 1.47477 | 0.15392756 | 9.5809 |
| 3 | 0.16239512 | 0.14558972 | 1.46944 | 0.15399242 | 9.5423 |
| 4 | 0.16274722 | 0.14568166 | 1.47958 | 0.15421444 | 9.5943 |
| 5 | 0.16236640 | 0.14544080 | 1.47425 | 0.15390360 | 9.5790 |
| Mean value of | —— | —— | —— | —— | 9.5750 |
According to the results of the experiments in Table 3, the average acceleration of the test piece 400 passing between the two light beams was 9.5750m/s2According to the theoretical gravitational acceleration value g being 9.80m/s2When the calibrated vehicle speed detector is applied to road speed detection, and the acceleration measured by the system is a, the true value a of the acceleration actually output by the system is a, namely a 1.02307 a. The application provides a road motor vehicle speed detector calibrating device, simple structure can carry out the school in the workshop laboratoryThe method comprises the steps of performing quasi operation, simulating the running state of the motor vehicle when the motor vehicle runs on a road by utilizing the unchanged gravity acceleration of free falling of an object, calculating the speed and the acceleration of the test piece 400 in each stage according to the motion stroke of the test piece 400 and the time of passing through two detection light beams, comparing the speed and the acceleration with the theoretical value of the test piece 400 in each stage to obtain an acceleration calibration coefficient, conveniently calibrating and calibrating the produced motor vehicle speed detector in real time, and providing convenience for research and development of the road motor vehicle speed detector.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a simple and easy motor vehicle speed detector calibrating device, is applied to the calibration of road motor vehicle speed detector, its characterized in that includes:
two light beam emitters: the two light beam emitters emit light beams along the horizontal direction, and the two light beam emitters are arranged along the vertical direction;
the two light beam receivers are arranged in one-to-one correspondence with the two light beam transmitters;
the hollow guide tube is arranged between the two light beam transmitters and the two light beam receivers along the vertical direction, a first light-transmitting hole and a second light-transmitting hole are formed in the hollow guide tube along the axial vertical direction, and light beams emitted by the two light beam transmitters respectively penetrate through the first light-transmitting hole and the second light-transmitting hole and are received by the two light beam receivers respectively;
the test piece falls into in the cavity stand pipe along vertical direction, shelters from two in proper order the light beam of light beam transmitter transmission for the simulation motor vehicle passes through the running state of speed of a motor vehicle detector.
2. The simplified calibration apparatus for a motor vehicle speed detector according to claim 1, wherein the distance between the two light beams emitted from the two light beam emitters is equal to the distance between the first light-transmitting hole and the second light-transmitting hole, and both distances are set in a range of 50cm to 70 cm.
3. The calibration device of the simplified motor vehicle speed detector according to claim 2, wherein the length of the test piece ranges from 23cm to 70cm, the length of the hollow guide tube ranges from 2.0m to 3.0 m; the first light hole is arranged above the second light hole, and the distance range from the first light hole to the top end of the hollow guide tube is 1/2-2/3 of the length of the hollow guide tube.
4. The calibrating apparatus for a simplified motor vehicle speed detecting instrument as claimed in claim 3, wherein the diameters of the first and second light-transmitting holes are set to 10 cm.
5. The calibrating apparatus for a simplified motor vehicle speed detecting instrument as claimed in claim 1, wherein the testing member is a tubular testing member, and the inner diameter of the hollow guiding tube is larger than the outer diameter of the tubular testing member.
6. The calibrating apparatus for a simplified motor vehicle speed detecting instrument as claimed in claim 5, wherein the inner diameter of said hollow guiding tube is 45cm, and the outer diameter of said tubular testing member is 40 cm.
7. The simplified vehicle speed tester calibration apparatus according to claim 1, wherein the calibration apparatus further comprises a mounting assembly for ensuring free fall of the test piece.
8. The calibrating apparatus for a simplified motor vehicle speed detecting instrument according to claim 7, wherein the testing member is an iron testing member, and the hollow guiding tube is a plastic hollow guiding tube;
the mounting assembly comprises an electromagnet arranged above the hollow guide pipe, and the test piece is vertically adsorbed on the electromagnet; the mounting assembly further comprises a displacement driving mechanism used for adjusting the position of the test piece along the vertical direction, and the electromagnet is mounted at the driving end of the displacement driving mechanism.
9. The simplified calibration apparatus for a motor vehicle speed detector according to claim 8, wherein the displacement driving mechanism comprises a vertically disposed electric lead screw lift, and the electromagnet is mounted to the driving end of the electric lead screw lift through a mounting plate.
10. The calibrating apparatus for a simplified motor vehicle speed detecting instrument as claimed in claim 8, wherein the lower end of the testing member is disposed at the inlet of the upper end of the hollow guiding tube.
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| CN202020443252.2U CN211697864U (en) | 2020-03-31 | 2020-03-31 | Simple motor vehicle speed detector calibrating device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113970653A (en) * | 2021-10-21 | 2022-01-25 | 陕西鼎泰光宇科技有限公司 | Novel laser sensing simulation speed measurement method, system, equipment and terminal |
| CN113970652A (en) * | 2021-10-20 | 2022-01-25 | 陕西鼎泰光宇科技有限公司 | Laser sensing simulation speed measurement method and system, computer equipment, terminal and medium |
| CN113983939A (en) * | 2021-10-19 | 2022-01-28 | 浙江吉尚汽车部件有限公司 | Device and method for measuring through hole distance on inner hole wall of brake pump cylinder body |
| CN113970652B (en) * | 2021-10-20 | 2024-05-28 | 陕西鼎泰光宇科技有限公司 | Laser sensing simulation speed measuring method, system, computer equipment, terminal and medium |
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- 2020-03-31 CN CN202020443252.2U patent/CN211697864U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113983939A (en) * | 2021-10-19 | 2022-01-28 | 浙江吉尚汽车部件有限公司 | Device and method for measuring through hole distance on inner hole wall of brake pump cylinder body |
| CN113983939B (en) * | 2021-10-19 | 2024-03-26 | 浙江吉尚汽车部件有限公司 | Device and method for measuring distance between through holes on inner hole wall of brake pump cylinder body |
| CN113970652A (en) * | 2021-10-20 | 2022-01-25 | 陕西鼎泰光宇科技有限公司 | Laser sensing simulation speed measurement method and system, computer equipment, terminal and medium |
| CN113970652B (en) * | 2021-10-20 | 2024-05-28 | 陕西鼎泰光宇科技有限公司 | Laser sensing simulation speed measuring method, system, computer equipment, terminal and medium |
| CN113970653A (en) * | 2021-10-21 | 2022-01-25 | 陕西鼎泰光宇科技有限公司 | Novel laser sensing simulation speed measurement method, system, equipment and terminal |
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