CN105333885A - Speedometer - Google Patents
Speedometer Download PDFInfo
- Publication number
- CN105333885A CN105333885A CN201410370832.2A CN201410370832A CN105333885A CN 105333885 A CN105333885 A CN 105333885A CN 201410370832 A CN201410370832 A CN 201410370832A CN 105333885 A CN105333885 A CN 105333885A
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- China
- Prior art keywords
- odometer
- drain pan
- computing unit
- fork
- wheel
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Abstract
The invention discloses a speedometer, which includes a bottom shell, a shaft, a swing rod, Hall sensors and a calculation unit. The bottom shell is connected with a wheel; the shaft is arranged on the bottom shell and coaxial with the wheel, and rotates synchronously with the rotation of the wheel; the swing rod is configured to swing freely surround the shaft, and the free end of the swing rod is provided with a magnet; the Hall sensors are arranged on the bottom shell to rotate with the wheel, and induce the magnetic field of the magnet when rotation with the wheel to a position near the magnet; and the calculation unit calculates the mileage according to the sensing signal output by the Hall sensors. Through the technical scheme, the speedometer has the advantages of simple structure, convenient use, accuracy comparable to mechanical counter, flexible arrangement and strong universality.
Description
Technical field
The present invention relates to vehicle electric field, particularly, relate to a kind of odometer.
Background technology
Along with popularizing of automobile, relevant accessory is used to be developed to automobile.Drop and pull transport becomes the topic that logistics dealer pays close attention to.This America and Europe popular efficient transportation mode for many years gradually coastal developed regions at home bud out into popularity gradually.But implementing Drop and pull transport, the use of tractor has mileometer to count, but the use of trailer is then without rule, and the distance travelled of trailer is become and is difficult to statistics, the maintenance of vehicle bridge has just become a problem.In order to calculate the mileage of trailer, the sight that trailer mileage counting is more and more subject to people is paid close attention to.
The method of current trailer mileage counting mainly contains two kinds: mechanical count method and GPS localization method, and the former, by mechanical counter is installed on trailer wheels, detect the number of turns of wheel walking, then be converted into the mileage of trailer according to the diameter of wheel; The latter calculates the mileage of trailer with GPS localization method.
But, find that the method for above-mentioned two kinds of trailer mileages counting has certain limitation through using.Mechanical counter, complex structure, install difficulty, cost is high, and easily artificially being revised mileage can not long-rangely read.Although can long-rangely read with GPS localization method, there is no continuity, trailer mileage will be paid close attention to constantly, be inconvenient to use.
Good solution is there is no in the problems referred to above prior art.
Summary of the invention
The object of this invention is to provide a kind of equipment, this device structure is simple and accurate to mileage counting.
To achieve these goals, the invention provides a kind of odometer, this odometer comprises: drain pan, is configured to wheel affixed; Axle, to be configured to be arranged on drain pan and with wheel concentric, described axle follows the rotation of wheel and synchronous axial system; Fork, be configured to freely swing around described axle, the free end of this fork is provided with magnet; Hall element, is configured to be arranged on with vehicle wheel rotation on drain pan, and when with near vehicle wheel rotation to magnet time sensor magnet magnetic field; And computing unit, the induced signal being configured to export according to Hall element calculates mileage.
Further, Hall element quantity is multiple, and uniform on the same periphery concentric with wheel.
Further, the quantity of Hall element is two.
Further, two Hall elements are relative to being arranged on drain pan axisymmetrically.
Further, Hall element is configured to be arranged on the movement locus of magnet in the projection of drain pan.
Further, computing unit comprises: Hall counter, is configured to according to the induced signal of Hall element the turning collar counting number of wheel; And controller, be configured to calculate mileage according to the rotation number of turns.
Further, odometer also comprises: cover plate, and this cover plate is suitable for assembling with drain pan, and the space that this cover plate and drain pan surround is suitable for holding axle, fork, Hall element and computing unit.
Further, odometer also comprises: antenna, is arranged on cover plate, is configured to the signal wireless from computing unit launch and export the signal of wireless receiving to computing unit.
Further, odometer also comprises: starting switch, be arranged on the surface of contact of drain pan and wheel, be configured to communicate with described computing unit according to the installment state of described odometer, wherein after described odometer is installed, installation signal communicates described computing unit by described starting switch, and responsively, described computing unit starts counting; And when described odometer is disassembled, dismounting signal communicates described computing unit by this starting switch, responsively, described computing unit stops counting.
Further, the free end of fork is also provided with balancing weight, keeps sagging to make described fork.
Further, fork is T-shaped, and the free end of this fork has two projections relative to fork center line symmetry on swaying direction.
Further, the free end of fork is also provided with balancing weight, and balancing weight quantity is two and is symmetricly set in two projections.
Further, odometer also comprises dormancy awakening unit; When wheel does not rotate, mileage counts dormant state; And when vehicle wheel rotation, dormancy awakening unit makes odometer power on; Wherein dormancy awakening unit is at least one in Hall switch and accelerometer.
Further, axle passes drain pan from outside, and is fixed on drain pan by fastener by one end of axle; The other end of axle is connected by bearing with fork; And magnet embeds the free end of fork.
Further, Hall element and computing unit are arranged on a printed circuit on part (PCBA) assembly, and this PCBA assembly is bolted on drain pan; And this odometer also comprises battery, for powering to Hall element and computing unit, and this battery is suitable for being arranged in the space that surrounded by described PCBA assembly and described drain pan.
By technique scheme, simple, the easy to use accuracy can with the mechanical counter that matches in excellence or beauty of the odometer structure provided, and set-up mode is flexible, highly versatile.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for instructions, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the composition structural representation of the odometer provided according to embodiment of the present invention;
Fig. 2 is the side view of the odometer shown in Fig. 1;
Fig. 3 is the assembly structure schematic diagram of the odometer provided according to embodiment of the present invention;
Fig. 4 is the swing rod structure schematic diagram of the odometer provided according to embodiment of the present invention;
Fig. 5 is the example assembled schematic diagram of the odometer provided according to embodiment of the present invention; And
Fig. 6 is the exemplary electrical structural representation of the odometer provided according to embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Fig. 1 is the composition structural representation of the odometer provided according to embodiment of the present invention.As shown in Figure 1, odometer of the present invention can comprise: drain pan 1, is configured to wheel (not shown) affixed; Axle 5, to be configured to be arranged on described drain pan 1 and with described wheel concentric, described axle 5 can follow the rotation of wheel and synchronous axial system; Fork 14, be configured to freely swing around axle 5, the free end of this fork 14 is provided with magnet 15; Hall element 8 and 16, is configured to be arranged on with described vehicle wheel rotation on described drain pan 1, and when responding to the magnetic field of described magnet 15 with time near described vehicle wheel rotation to described magnet 15; And computing unit, the induced signal being configured to export according to described Hall element 8 and 16 calculates mileage.
By the odometer provided in above-mentioned embodiment, when installed wheel (such as, trailer wheels) rotates, Hall element 8 and 16 can with vehicle wheel rotation, and the free end of fork 14 is by gravity sag.Like this, the magnetic field of magnet 15 can be picked up when Hall element 8 or 16 arrives extreme lower position, thus export induced signal to computing unit.If the output signal of Hall element 8 is set to signal 1, the output signal of Hall element 16 is set to signal 2, then when vehicle wheel rotation make computing unit receive signal 1 and signal 2 each once time (such as, signal 1, signal 2; Or signal 2, signal 1) vehicle wheel rotation one circle can be judged.So repeatedly, the number of turns of vehicle wheel rotation can be calculated.
In embodiments, Hall element and computing unit can be arranged on a printed circuit on part (PCBA) assembly, are then fixed on drain pan 1 by PCBA assembly.
In various embodiments, the quantity of Hall element can require to arrange according to cost control and counting precision.Such as, if require higher and less demanding to counting precision to cost control, then an only Hall element can be adopted.In such embodiment, vehicle wheel rotation one circle can be judged when vehicle wheel rotation makes computing unit receive signal 1; If to cost control less demanding and to counting precision require higher, then can adopt multiple Hall element, such as, 3,4.Like this, when the vehicle wheel rotation signal group arranged in turn that makes computing unit receive, such as, when signal 1,2,3,4 or signal 2,3,4,1 etc., then vehicle wheel rotation one circle can be judged.In a preferred embodiment, 2 Hall elements are adopted to be the selection taking into account cost control and counting precision.
In embodiments, when the quantity of Hall element is multiple, multiple Hall element can be uniform on the same periphery concentric with wheel, makes the Detection results on magnet 15 of multiple Hall element can not be subject to the impact of diverse location on wheel.Certainly, in order to ensure that each Hall element can both carry out actual induction to the magnetic field of magnet 15, in a preferred embodiment, Hall element can be arranged on the movement locus of magnet 15 in the projection of drain pan 1.
After the number of turns obtaining vehicle wheel rotation, the distance utilizing the wheel rolling one that pre-sets to enclose to advance computing can obtain the distance that wheel advances, i.e. mileage.Wheel rolling one is enclosed the distance of advancing and can be calculated by wheel diameter.In embodiments, the calculating of mileage is undertaken by computing unit.In enforceable embodiment, computing unit can comprise: Hall counter, according to the induced signal of Hall element 8 and 16 to the turning collar counting number of wheel; And controller (such as, microprocessor (MCU)), calculate mileage according to the described rotation number of turns.In above-mentioned embodiment, vehicle wheel rotation one encloses the distance of advancing and can arrange in the controller in advance.After controller obtains the rotation number of turns, the number of turns can be multiplied by vehicle wheel rotation one enclose advanced distance, thus obtain mileage.In enforceable embodiment, computing unit can be MCU, and the tally function utilizing MCU to carry and arithmetic capability can realize the function of counter and controller.Like this, the built-in operation rule of MCU (or program) just can be utilized to obtain mileage by being input in MCU by the signal of Hall element 8 and 16.
By technique scheme, simple, the easy to use accuracy can with the mechanical counter that matches in excellence or beauty of the odometer structure provided, and set-up mode is flexible, highly versatile.
Below in conjunction with Fig. 3, the structure of the odometer that embodiment of the present invention provides is described in detail.Fig. 3 is the assembly structure schematic diagram (elevational schematic) of the odometer provided according to embodiment of the present invention.As shown in Figure 3, the odometer that embodiment of the present invention provides can comprise: cover plate 13, and this cover plate 13 is suitable for assembling with drain pan 1, such as, by bolt 7.The space that this cover plate 13 and drain pan 1 surround is suitable for holding axle 5, fork 14, Hall element 8 and 16, PCBA assembly 6 and battery 2.
Wherein, assembled shaft 5 on drain pan 1, can pass drain pan 1 by axle 5 from outside, then make axle 5 be fixed on drain pan 1 with jump ring 3; Again by 2 batteries 2 and 2 Hall elements are housed (are respectively Hall element 8 and Hall element 16, and two Hall elements are point-blank) PCBA assembly 6 be fixed on drain pan 1 with screw 9, wherein, battery 2 can be suitable for being arranged in the space that surrounded by PCBA assembly and drain pan 1.Fork 14 can be T-shaped, and the free end of this fork 14 can have two projections relative to fork 14 center line symmetry on swaying direction.Fork 14 is equipped with magnet 15 and 2 balancing weights 18 (as Fig. 4), fork 14 is connected with axle 5 by bearing 17, and locks with jump ring 11 and jump ring 10.Odometer can also comprise: starting switch 4, be arranged on drain pan 1 with on the surface of contact of wheel (not shown), be configured to communicate with computing unit according to the installment state of odometer, wherein after odometer is installed, installation signal can to communicate computing unit by starting switch, responsively, computing unit can start counting; And when odometer is disassembled, dismounting signal can to communicate computing unit by this starting switch, responsively, computing unit can stop counting (describing in detail below).In embodiments, starting switch can be configured to, after described odometer is installed, described odometer be powered on.
In embodiments, Hall element, computing unit and peripheral circuit module etc. can be arranged on PCBA.For the ease of with the devices communicating being arranged on pilothouse, the odometer that embodiment of the present invention provides can have antenna 12, such as can be arranged on cover plate 13, the signal wireless from computing unit can be configured to launch and export the signal of wireless receiving to computing unit.In embodiments, in order to ensure signal transmission effect, in drain pan 1 and cover plate 13, at least the material of cover plate 13 is PET.Preferably, drain pan 1 and cover plate 13 are all made up of PET.
In embodiments, when drain pan 1 and cover plate 13 are all made up of PET, in order to ensure stable installation, odometer can be arranged on wheel by combining with the fixed support or fixed support of odometer form fit, as shown in Figure 5.First fixed support can be suitable for the axle head being assemblied in wheel, and multiple screws that circumferentially can be arranged by the first fixed support use bolt to fix axle head periphery.Second fixed support can be suitable for the odometer that accommodation embodiment of the present invention provides.In embodiments, for the vehicle of different model, can by selecting suitable the first support bracket fastened size, the shaft size of itself and wheel of vehicle is adapted.
As can be seen from Fig. 3 and Fig. 5 and above-mentioned assembling process, the odometer assembling that embodiment of the present invention provides is simple, structure is reliable, highly versatile, is suitable for Long-Time Service and is convenient to safeguard.
Fig. 4 is the swing rod structure schematic diagram of the odometer provided according to embodiment of the present invention.As shown in Figure 4, fork 14 can arrange bearing 17 with the link of axle 5 (not shown), to ensure to rotate flexibly.The free end of fork 14 can be provided with balancing weight 18, to ensure that fork 14 remains hang at vehicle wheel rotation.Breeding block 18 can be configured to make the line of axle 5 and fork 14 center of gravity by described magnet.In embodiments, the quantity of balancing weight 18 can be any amount, but is preferably even number and is symmetricly set in the both sides of above-mentioned line.
The electrical principle of the odometer provided below in conjunction with accompanying drawing 6 pairs of embodiment of the present invention is described.
Fig. 6 is the exemplary electrical structural representation of the odometer provided according to embodiment of the present invention.As shown in Figure 6, the odometer that embodiment of the present invention provides adopts 6V power supply (such as, by the battery of 2 3V of series connection) power supply.In odometer, each electricity consumption assembly rated voltage can be 3V.Can be that 3.3V is transported to each electricity consumption assembly by 6V power conversion by low pressure difference linear voltage regulator (LDO) like this.Odometer can adopt voltage detection module (such as, the PIC16LF1509 chip AD port of the micro-core of the U.S.) to detect the voltage of power supply (such as, battery), to inform MCU when supply voltage worsens.
In embodiments, Hall module can be arranged on PCBA assembly 6, and it can comprise Hall element and Hall counter, and Hall module can be carried out pickup output sensor signal to the magnetic field of magnet and/or count up to MCU.
In embodiments, control (RTC) module in real time can be arranged on PCBA assembly 6.This RTC module can provide a real-time clock for odometer.This RTC module can pass through I
2c line is connected with MCU.RTC module is mainly made up of the peripheral circuit of a RTC chip (such as, the MCP79410 of the micro-core of the U.S.) and necessity.When trailer wheels starts rotation or trailer starts, start-up time now can be passed to MCU by RTC module; When trailer power cut-off, MCU is also by the record time now.RTC module is used in conjunction with mileage counting, the details such as the average velocity of trailer and the running time of record trailer can be obtained.
In embodiments, the signal emitting antenna 12 speedometer arranged can be driven by near-field communication (NFC) module (such as, the PN5321A3HN/C106 of NXP company) that PCBA assembly 6 is arranged.NFC module exemplarily can be made up of the match circuit of a PN532 chip and antenna.This NFC module can be connected with MCU by UART interface, its effect can be the data that MCU stores sent by antenna 12, simultaneously, when needs transfer signals to odometer from outside, this NFC module can receive data, then transfers data to MCU, like this can so that set some parameters of odometer, for example wheel diameter or girth, and license plate number etc.
In embodiments, in order to prevent someone from dismantling odometer Update Table, in the odometer that embodiment of the present invention provides, an Anti-dismantling module is devised.Anti-dismantling module can have a starting switch 4, when odometer is contained on trailer, starting switch 4 becomes closure state with trailer wheels axle close contact, can give MCU high level.When there being people that odometer is disassembled, starting switch 4 is released, that passes to MCU becomes a low level, now MCU can record split temporal information when getting off, and does not count the signal (or number of turns of wheel) from Hall element when the MCU signal that can be provided in from starting switch is low level.In various embodiments, starting switch 4 can be arranged in current supply circuit, and make only when starting switch 4 is because odometer is mounted during conducting, each electricity consumption assembly of odometer just can power on.By above-mentioned embodiment, after dismounting can be prevented, distort mileage.
In embodiments, odometer can also comprise dormancy awakening unit; In order to saves energy, when wheel does not rotate, odometer can be dormant state.When vehicle wheel rotation, dormancy awakening unit can detect that the rotary state of wheel makes odometer power on.Dormancy awakening unit can be Hall switch (such as, MLX90248) in embodiments.Dormancy awakening unit can also be accelerometer.In a preferred embodiment, dormancy awakening unit can comprise both Hall switch and accelerometer, and the two supplements mutually, avoids fault.In embodiment, odometer can also comprise storer, and be such as with EEPROM (Electrically Erasable Programmable Read Only Memo) (EEPROM), this storer can pass through I
2c line is connected with MCU.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible array mode.
In addition, also can carry out combination in any between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (15)
1. an odometer, is characterized in that, this odometer comprises:
Drain pan, is configured to wheel affixed;
Axle, to be configured to be arranged on described drain pan and with described wheel concentric, described axle follows the rotation of wheel and synchronous axial system;
Fork, be configured to freely swing around described axle, the free end of this fork is provided with magnet;
Hall element, is configured to be arranged on with described vehicle wheel rotation on described drain pan, and when responding to the magnetic field of described magnet with time near described vehicle wheel rotation to described magnet; And
Computing unit, the induced signal being configured to export according to described Hall element calculates mileage.
2. odometer according to claim 1, is characterized in that, described Hall element quantity is multiple, and uniform on the same periphery concentric with described wheel.
3. odometer according to claim 2, is characterized in that, the quantity of described Hall element is two.
4. odometer according to claim 3, is characterized in that, two described Hall elements are arranged on described drain pan axisymmetrically relative to described.
5. odometer according to claim 1, is characterized in that, described Hall element is configured to be arranged on the movement locus of described magnet in the projection of described drain pan.
6. odometer according to claim 1, is characterized in that, described computing unit comprises:
Hall counter, is configured to according to the described induced signal of described Hall element the turning collar counting number of described wheel; And
Controller, is configured to calculate mileage according to the described rotation number of turns.
7. odometer according to claim 1, is characterized in that, described odometer also comprises:
Cover plate, this cover plate is suitable for assembling with described drain pan, and the space that this cover plate and described drain pan surround is suitable for holding described axle, described fork, described Hall element and described computing unit.
8. odometer according to claim 7, is characterized in that, described odometer also comprises antenna, is arranged on described cover plate, is configured to the signal wireless from described computing unit launch and export the signal of wireless receiving to described computing unit.
9. odometer according to claim 1, is characterized in that, described odometer also comprises:
Starting switch, is arranged on the surface of contact of described drain pan and described wheel, is configured to communicate with described computing unit according to the installment state of described odometer, wherein
After described odometer is installed, installations signal communicates described computing unit by described starting switch, and responsively, described computing unit starts and counts; And
When described odometer is disassembled, dismounting signal communicates described computing unit by this starting switch, and responsively, described computing unit stops counting.
10. odometer according to claim 1, is characterized in that, the free end of described fork is also provided with balancing weight, keeps sagging to make described fork.
11. odometers according to claim 1, is characterized in that, described fork is T-shaped, and the free end of this fork has two projections relative to fork center line symmetry on swaying direction.
12. odometers according to claim 11, is characterized in that, the free end of described fork is also provided with balancing weight, and described balancing weight quantity is two and is symmetricly set in described two projections.
13. odometers according to claim 1, is characterized in that, described odometer also comprises dormancy awakening unit;
When described wheel does not rotate, described mileage counts dormant state; And
When described vehicle wheel rotation, described dormancy awakening unit makes described odometer power on;
Wherein said dormancy awakening unit is at least one in Hall switch and accelerometer.
14. odometers according to claim 1, is characterized in that, described axle passes described drain pan from outside, and is fixed on described drain pan by fastener by one end of described axle;
The other end of described axle is connected by bearing with described fork; And
Described magnet embeds the free end of described fork.
15. odometers according to claim 1, is characterized in that, described Hall element and described computing unit are arranged on a printed circuit on part (PCBA) assembly, and this PCBA assembly is bolted on described drain pan; And
This odometer also comprises battery, and for powering to described Hall element and described computing unit, and this battery is suitable for being arranged in the space that surrounded by described PCBA assembly and described drain pan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410370832.2A CN105333885A (en) | 2014-07-30 | 2014-07-30 | Speedometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410370832.2A CN105333885A (en) | 2014-07-30 | 2014-07-30 | Speedometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105333885A true CN105333885A (en) | 2016-02-17 |
Family
ID=55284543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410370832.2A Pending CN105333885A (en) | 2014-07-30 | 2014-07-30 | Speedometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105333885A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111928871A (en) * | 2020-09-15 | 2020-11-13 | 深圳大学 | Precision magnetic Hall odometer |
| CN114353822A (en) * | 2022-01-11 | 2022-04-15 | 深圳市几米物联有限公司 | Trailer mileage recording method, trailer and recording system |
| CN114739421A (en) * | 2022-04-14 | 2022-07-12 | 湖南庄耀光电科技有限公司 | Automobile and mileage counting device thereof |
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| CN1345916A (en) * | 2000-09-29 | 2002-04-24 | 姜伟志 | Multi-function gasoline synergist and preparation process thereof |
| CN2558959Y (en) * | 2001-12-25 | 2003-07-02 | 北京海弗莱医疗设备有限责任公司 | Swing stem type pedometer |
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| CN203605951U (en) * | 2013-09-16 | 2014-05-21 | 昆山高诠电子有限公司 | Novel electronic stopwatch |
| CN203772887U (en) * | 2013-11-06 | 2014-08-13 | 曾广海 | Device used for detecting state of rotating body and wheel hub odometer comprising same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08249440A (en) * | 1995-03-08 | 1996-09-27 | Omron Corp | Sensor structure of pedometer |
| CN1345916A (en) * | 2000-09-29 | 2002-04-24 | 姜伟志 | Multi-function gasoline synergist and preparation process thereof |
| CN2558959Y (en) * | 2001-12-25 | 2003-07-02 | 北京海弗莱医疗设备有限责任公司 | Swing stem type pedometer |
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| CN203605951U (en) * | 2013-09-16 | 2014-05-21 | 昆山高诠电子有限公司 | Novel electronic stopwatch |
| CN203772887U (en) * | 2013-11-06 | 2014-08-13 | 曾广海 | Device used for detecting state of rotating body and wheel hub odometer comprising same |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111928871A (en) * | 2020-09-15 | 2020-11-13 | 深圳大学 | Precision magnetic Hall odometer |
| CN114353822A (en) * | 2022-01-11 | 2022-04-15 | 深圳市几米物联有限公司 | Trailer mileage recording method, trailer and recording system |
| CN114739421A (en) * | 2022-04-14 | 2022-07-12 | 湖南庄耀光电科技有限公司 | Automobile and mileage counting device thereof |
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