CN118050180A - Brake distance testing device, system and method - Google Patents
Brake distance testing device, system and method Download PDFInfo
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Abstract
The application relates to a brake distance testing device, a system and a method, which are applied to the technical field of equipment testing, wherein the brake distance testing device comprises a first ranging module, a second ranging module and a control module, and the first ranging module and the second ranging module are connected with the control module; the control module is used for sending a braking instruction to the tested object so as to enable the tested object to start braking until stopping; the first distance measuring module is used for measuring the measuring distance from the position of the measured object when the brake instruction is acquired to the stop position of the measured object; the second distance measuring module is used for measuring the error distance of the measured object from the acquisition of the braking instruction to the execution of the braking instruction; and the control module is used for determining the braking distance of the measured object according to the error distance and the measured distance. The problem of among the prior art, manual control issues brake instruction and has the time delay, causes great brake distance test error is solved.
Description
Technical Field
The application relates to the technical field of equipment testing, in particular to a braking distance testing device, a braking distance testing system and a braking distance testing method.
Background
With the development of modern technology, robots are receiving more and more attention. More and more service robots are developed for use in different scenarios, such as meal delivery, welcome, patrol, etc. These robots usually travel through the wheels under the robots, and it is important to analyze the travel conditions of these robots, especially the braking conditions.
The braking distance of the robot has very important influence on the safety of the robot. Therefore, it is particularly important to test the braking distance of the robot after the robot is generated.
In the related art, the measurement of the braking distance of the robot is mostly manual control of the robot braking and manual measurement of the distance. Because of the time delay of the manual control for issuing the brake command, the time delay caused by the actual manual operation may reach 0.5 s-1 s, thereby causing a larger brake distance test error.
Disclosure of Invention
The application provides a brake distance testing device, a system and a method, which are used for solving the problem of larger brake distance testing error caused by time delay in manual control of issuing a brake instruction in the prior art.
In a first aspect, an embodiment of the present application provides a braking distance testing apparatus, including: the system comprises a first ranging module, a second ranging module and a control module, wherein the first ranging module and the second ranging module are connected with the control module;
The control module is used for sending a braking instruction to the tested object so as to enable the tested object to start braking until stopping;
the first distance measuring module is used for measuring the measuring distance from the position of the measured object when the brake instruction is acquired to the stop position of the measured object;
The second distance measuring module is used for measuring the error distance of the measured object from the acquisition of the braking instruction to the execution of the braking instruction;
And the control module is used for determining the braking distance of the measured object according to the error distance and the measurement distance.
Optionally, the second ranging module is specifically configured to:
Acquiring the speed of the tested object before acquiring the braking instruction;
Acquiring a first duration from the acquisition of the brake instruction to the execution of the brake instruction of the object to be tested;
and determining an error distance according to the speed and the first time length.
Optionally, a marker is arranged on the measured object, and the marker has a preset width;
the second ranging module is specifically configured to transmit infrared data outwards, and determine a second duration for receiving reflected data, where the reflected data is generated after the tag reflects the infrared data;
And determining the speed based on the preset width and the second duration.
Optionally, the method further comprises: the detector is connected with the control module;
the detector is used for detecting whether a detected object reaches a preset braking position or not, and sending a detection signal to the control module when the detected object is detected to reach the preset braking position;
and the control module is used for generating a brake instruction according to the detection signal and sending the brake instruction to the tested object.
Optionally, the first ranging module is specifically configured to:
Measuring a first distance between the position of the measured object when the brake instruction is acquired and the first distance measuring module;
Measuring a second distance between the measured object at a stop position and the first distance measuring module;
and determining the difference value between the first distance and the second distance as the measured distance.
In a second aspect, an embodiment of the present application provides a braking distance testing system, including: the object to be tested and the braking distance testing device according to the first aspect.
In a third aspect, an embodiment of the present application provides a method for testing a braking distance, including:
sending a brake instruction to a measured object so as to enable the measured object to start braking until stopping;
Acquiring a measuring distance from a position of the measured object when the brake instruction is acquired to a stop position of the measured object;
acquiring the error distance of the tested object from the acquisition of the braking instruction to the execution of the braking instruction;
And determining the braking distance of the measured object according to the error distance and the measured distance.
Optionally, the obtaining the error distance travelled by the object under test from obtaining the braking instruction to executing the braking instruction includes:
Acquiring the speed of the tested object before acquiring the braking instruction;
Acquiring a first duration from the acquisition of the brake instruction to the execution of the brake instruction of the object to be tested;
and determining an error distance according to the speed and the first time length.
Optionally, the obtaining a measured distance between the position of the measured object when the brake instruction is obtained and the stopping position of the measured object includes:
Acquiring a first distance between the position of the measured object when acquiring the brake instruction and the first distance measuring module;
Acquiring a second distance between the stop position of the measured object and the first distance measuring module;
and determining the difference value between the first distance and the second distance as the measured distance.
Optionally, the acquiring the speed of the measured object when acquiring the braking instruction includes:
Determining a second duration of receiving reflection data, wherein the reflection data is generated after a marker on the measured object reflects infrared data transmitted by a second ranging module;
the speed is determined based on a preset width of the marker and the second duration.
In a fourth aspect, an embodiment of the present application provides an electronic device, including: the device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
The memory is used for storing a computer program;
The processor is configured to execute the program stored in the memory, and implement the braking distance testing method according to the third aspect.
In a fifth aspect, an embodiment of the present application provides a computer readable storage medium storing a computer program, where the computer program when executed by a processor implements the braking distance testing method according to the third aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages: according to the braking distance testing device provided by the embodiment of the application, the first ranging module, the second ranging module and the control module are arranged, and the first ranging module and the second ranging module are connected with the control module; the control module is used for sending a braking instruction to the tested object so as to enable the tested object to start braking until stopping; the first distance measuring module is used for measuring the measuring distance from the position of the measured object when the brake instruction is acquired to the stop position of the measured object; the second distance measuring module is used for measuring the error distance of the measured object from the acquisition of the braking instruction to the execution of the braking instruction; and the control module is used for determining the braking distance of the measured object according to the error distance and the measurement distance. Therefore, the control module directly sends the brake instruction to the measured object, the time delay of manually issuing the brake instruction is avoided, the measurement distance is automatically measured through the first distance measuring module, and the error distance is automatically measured through the second distance measuring module, so that the actual brake distance of the measured object can be calculated, the calculated brake distance is more accurate, and the measurement error is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a block diagram of a brake distance testing apparatus according to an embodiment of the present application;
FIG. 2 is a block diagram of a brake distance testing device according to an embodiment of the present application;
FIG. 3 is a flowchart of a braking distance testing method according to an embodiment of the present application;
FIG. 4 is a flowchart of a braking distance testing method according to another embodiment of the present application;
fig. 5 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In one embodiment of the present application, a braking distance testing apparatus is provided, referring to fig. 1, the apparatus includes: the system comprises a first ranging module 101, a second ranging module 102 and a control module 103, wherein the first ranging module and the second ranging module are connected with the control module;
The control module is used for sending a braking instruction to the tested object so as to enable the tested object to start braking until stopping;
the first distance measuring module is used for measuring the measuring distance from the position of the measured object when the brake instruction is acquired to the stop position of the measured object;
The second distance measuring module is used for measuring the error distance of the measured object from the acquisition of the braking instruction to the execution of the braking instruction;
And the control module is used for determining the braking distance of the measured object according to the error distance and the measurement distance.
In some embodiments, the control module directly sends the braking instruction to the measured object, so that the time delay of manually issuing the braking instruction is avoided, the measurement distance is automatically measured through the first ranging module, and the error distance is automatically measured through the second ranging module, so that the actual braking distance of the measured object can be calculated, the calculated braking distance is more accurate, and the measurement error is reduced.
Because the measured object needs a certain period of time from receiving the braking instruction to executing the braking, the measured object runs at the original speed within the period of time. Therefore, the obtained braking distance is more accurate by calculating the error distance in the period of time and subtracting the error distance from the measured distance.
The first ranging module may be disposed at a position that is a certain distance away from the stop position on the driving route of the measured object. The first ranging module may be, but is not limited to being, a radar rangefinder.
Further, the second ranging module is specifically configured to:
Acquiring the speed of the tested object before acquiring the braking instruction;
Acquiring a first duration from the acquisition of the brake instruction to the execution of the brake instruction of the object to be tested;
and determining an error distance according to the speed and the first time length.
The speed of the measured object can be obtained through detection by a velocimeter, and the measured object is obtained through active reporting.
And calculating the error distance by calculating the product of the speed and the first duration.
In an alternative embodiment, a marker is arranged on the tested object, and the marker has a preset width; the preset width may be set according to the size of the object to be measured or set according to a specified size.
The second ranging module is specifically configured to transmit infrared data outwards, and determine a second duration of receiving reflected data, where the reflected data is generated after the tag reflects the infrared data;
And determining the speed based on the preset width and the second duration.
The second ranging module may be disposed on a side of a driving route of the measured object, and when the measured object passes, the infrared data sent by the second ranging module is blocked by a marker on the measured object, so that the infrared data is reflected, and the duration of obtaining the reflected data is determined to be a second duration.
In an alternative embodiment, the braking distance testing device further includes: the detector is connected with the control module;
the detector is used for detecting whether a detected object reaches a preset braking position or not, and sending a detection signal to the control module when the detected object is detected to reach the preset braking position;
and the control module is used for generating a brake instruction according to the detection signal and sending the brake instruction to the tested object.
In some embodiments, the brake command acquired by the object to be tested may be triggered after the object to be tested reaches the preset brake position, and by setting the detector at the preset brake position, the object to be tested can be detected by the detector after the object to be tested reaches the preset brake position, so that the detector generates a detection signal and sends the detection signal to the controller, and the controller generates the brake command based on the detection signal to instruct the object to be tested to brake.
The preset braking position can be set according to actual conditions, and the detector is arranged on the side face of the preset braking position.
In an alternative embodiment, the first ranging module is specifically configured to:
Measuring a first distance between the position of the measured object when the brake instruction is acquired and the first distance measuring module;
Measuring a second distance between the measured object at a stop position and the first distance measuring module;
and determining the difference value between the first distance and the second distance as the measured distance.
In some embodiments, the first ranging module may obtain the first distance by measuring its own distance to a preset braking position. After the measured object stops, the distance between the measured object and the first distance measuring module is not changed any more, and the obtained distance is taken as a second distance.
In a specific embodiment, referring to fig. 2, taking a measured object as a robot, the first ranging module is a ranging detector, the second ranging module is an infrared detector and a speed measuring module, and the controller is set in a PC for example, and the infrared detector is set 1 meter away from a preset braking position.
The braking position is defined in advance, the ranging detector is connected with the PC through Bluetooth, the infrared detector and the speed measuring module are connected with the PC through USB data lines, special markers are deployed right in front of the robot and on the side face of the robot, the special markers are placed at the starting position, the position of the infrared detector is set to be the marker which can just detect the side face of the robot, and the ranging detector can accurately detect the marker distance X1 right in front of the robot. Then the robot moves back by 5-10 m in a straight line, the robot moves forward at different speeds by a PC remote control, and when the robot moves to a starting position, the speed measuring module and the built-in photoelectric switch of the infrared detector are triggered simultaneously.
When the infrared detector detects that a blocking object exists in the range of 1m in front of the infrared detector, analog signal change exists, the digital signal change can be converted into digital output at the PC end, and therefore, a robot braking instruction, such as P, can be output when the infrared detector PC end is set to detect that the blocking object exists in the range of 1m, and then the digital signal P converted by the infrared detector is analyzed and implanted into a program at the robot remote control program end. Therefore, when the robot runs to the braking position, the infrared detector is immediately triggered to send a braking instruction, and after the robot receives the braking instruction, the braking instruction is sent to the robot.
The PC remotely controls the robot to brake and the client interface displays the trigger moment of the running speed V of the robot, the measurement error X S is calculated, the robot continues to slide until stopping, the distance detector accurately detects the distance X2 of the marker right in front of the robot again, and the braking distance DeltaX is calculated through the system.
The infrared detector continuously receives and transmits infrared data (a receiving and transmitting period is 0.5 ms), when the robot passes through the marker, the infrared detector only receives available infrared data within the range of the width of the marker, and the speed V=L/Δt of the passing moment of the robot can be calculated according to the time difference deltat of the first and last frames of the received effective data and the width L of the marker.
Specifically, when the robot is placed at the brake starting position, the distance measuring detector can accurately detect that the distance of a blocking object right in front of the vertical direction of the robot is X1, the distance measuring detector is connected with the PC through Bluetooth, the distance measuring detector is used for transmitting the acquired X1 to the PC application end, when the robot vertically drives towards the brake starting position at a certain speed (any speed in the specification), the robot stops at the brake end position after the final infrared detector triggers the brake function, the distance measuring detector can accurately detect that the distance of the blocking object right in front of the vertical direction of the robot is X2 (X1 is more than X2), and the brake distance DeltaX=X 1-X2-X S can be obtained by subtracting the system error X S.
The braking distance testing device can accurately and efficiently measure the braking distance of the robot, reduce errors caused by manual control, greatly improve the overall performance of the product, and ensure more reliability of running, suspension and the like of the product.
Based on the same concept, an embodiment of the present application provides a braking distance testing system, which includes an object to be tested and the braking distance testing device described in the above related embodiments.
The object to be measured may be any device having a braking function, for example: automobiles, toy vehicles, robots, and the like.
Based on the same conception, an embodiment of the application provides a braking distance testing method which can be applied to any type of electronic equipment, such as a terminal and a server.
As shown in fig. 3, the braking distance testing method includes:
step 301, a braking instruction is sent to a measured object, so that the measured object starts to brake until stopping.
Step 302, obtaining a measured distance from a position of the object to be measured when the brake instruction is obtained to a stop position of the object to be measured.
Step 303, obtaining the error distance of the tested object from obtaining the braking instruction to executing the braking instruction.
And 304, determining the braking distance of the measured object according to the error distance and the measured distance.
In an optional embodiment, the acquiring the error distance travelled by the object from acquiring the braking instruction to executing the braking instruction includes:
Acquiring the speed of the tested object before acquiring the braking instruction;
Acquiring a first duration from the acquisition of the brake instruction to the execution of the brake instruction of the object to be tested;
and determining an error distance according to the speed and the first time length.
In an optional embodiment, the acquiring the measured distance between the position of the object to be measured when the brake command is acquired and the stopping position of the object to be measured includes:
Acquiring a first distance between the position of the measured object when acquiring the brake instruction and the first distance measuring module;
Acquiring a second distance between the stop position of the measured object and the first distance measuring module;
and determining the difference value between the first distance and the second distance as the measured distance.
In an alternative embodiment, the acquiring the speed of the tested object when acquiring the brake command includes:
determining a second time length for receiving reflection data, wherein the reflection data is infrared data transmitted by a marker on the measured object to a second ranging module;
the speed is determined based on a preset width of the marker and the second duration.
In an alternative embodiment, referring to fig. 4, a specific implementation flow of the braking distance testing method of the present application is that a robot is placed at a braking start position, an infrared detector is debugged to keep horizontal with a marker on the side surface of the robot, so as to ensure that the robot can trigger, a ranging module is adjusted to be in front of the robot, and a ranging laser is directly hit on the marker arranged in front of the robot, so as to measure an initial distance X1. The infrared detector is debugged and kept level with the robot side marker, ensure that the robot can trigger, and the infrared detector is connected with the PC through USB. And setting the infrared detector to call the virtual keyboard output P of the PC. Starting the robot, connecting the PC with the robot through WIFI, and starting a robot remote control program. The remote control robot is linearly retreated to a position 10m from the start position, and the remote control robot is linearly retreated to a position 10m from the start position. The remote control robot linearly advances to a brake starting position, the infrared detector ranging module obtains the running speed V of the robot, and the client of the infrared detector PC calculates a system error X S. The robot acquires a virtual key P, the robot starts to brake and slides to stop, and the distance measuring module measures the brake end point distance X2 of the robot. The final braking distance deltax=x1-X2-X S is calculated in combination with the measured data of each sensor and displayed on the upper computer.
Based on the same conception, the embodiment of the application also provides an electronic device, as shown in fig. 5, which mainly comprises: processor 501, memory 502 and communication bus 503, wherein processor 501 and memory 502 accomplish the communication between each other through communication bus 503. The memory 502 stores a program executable by the processor 501, and the processor 501 executes the program stored in the memory 502 to implement the following steps:
sending a brake instruction to a measured object so as to enable the measured object to start braking until stopping;
Acquiring a measuring distance from a position of the measured object when the brake instruction is acquired to a stop position of the measured object;
acquiring the error distance of the tested object from the acquisition of the braking instruction to the execution of the braking instruction;
And determining the braking distance of the measured object according to the error distance and the measured distance.
The communication bus 503 mentioned in the above electronic device may be a peripheral component interconnect standard (PERIPHERAL COMPONENT INTERCONNECT, abbreviated as PCI) bus or an extended industry standard architecture (Extended Industry Standard Architecture, abbreviated as EISA) bus, or the like. The communication bus 503 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in fig. 5, but not only one bus or one type of bus.
The memory 502 may include random access memory (Random Access Memory, RAM) or may include non-volatile memory (nonvolatile memory), such as at least one disk memory. Optionally, the memory may also be at least one memory device located remotely from the aforementioned processor 501.
The processor 501 may be a general-purpose processor, including a central Processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), a digital signal processor (DIGITAL SIGNAL Processing, DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, or discrete hardware components.
In yet another embodiment of the present application, there is also provided a computer-readable storage medium having stored therein a computer program which, when run on a computer, causes the computer to perform the braking distance test method described in the above embodiment.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, by a wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, microwave, etc.) means from one website, computer, server, or data center to another. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape, etc.), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk), etc.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A braking distance testing device, comprising: the system comprises a first ranging module, a second ranging module and a control module, wherein the first ranging module and the second ranging module are connected with the control module;
The control module is used for sending a braking instruction to the tested object so as to enable the tested object to start braking until stopping;
the first distance measuring module is used for measuring the measuring distance from the position of the measured object when the brake instruction is acquired to the stop position of the measured object;
The second distance measuring module is used for measuring the error distance of the measured object from the acquisition of the braking instruction to the execution of the braking instruction;
And the control module is used for determining the braking distance of the measured object according to the error distance and the measurement distance.
2. The braking distance testing device according to claim 1, wherein the second ranging module is specifically configured to:
Acquiring the speed of the tested object before acquiring the braking instruction;
Acquiring a first duration from the acquisition of the brake instruction to the execution of the brake instruction of the object to be tested;
and determining an error distance according to the speed and the first time length.
3. The braking distance testing device according to claim 2, wherein a marker is arranged on the object to be tested, and the marker has a preset width;
the second ranging module is specifically configured to transmit infrared data outwards, and determine a second duration for receiving reflected data, where the reflected data is generated after the tag reflects the infrared data;
And determining the speed based on the preset width and the second duration.
4. The braking distance testing apparatus according to claim 1, further comprising: the detector is connected with the control module;
the detector is used for detecting whether a detected object reaches a preset braking position or not, and sending a detection signal to the control module when the detected object is detected to reach the preset braking position;
and the control module is used for generating a brake instruction according to the detection signal and sending the brake instruction to the tested object.
5. The braking distance testing device according to claim 1, wherein the first ranging module is specifically configured to:
Measuring a first distance between the position of the measured object when the brake instruction is acquired and the first distance measuring module;
Measuring a second distance between the measured object at a stop position and the first distance measuring module;
and determining the difference value between the first distance and the second distance as the measured distance.
6. A brake distance testing system, comprising: a test object and a braking distance testing apparatus according to any one of claims 1 to 5.
7. A method for testing a braking distance, comprising:
sending a brake instruction to a measured object so as to enable the measured object to start braking until stopping;
Acquiring a measuring distance from a position of the measured object when the brake instruction is acquired to a stop position of the measured object;
acquiring the error distance of the tested object from the acquisition of the braking instruction to the execution of the braking instruction;
And determining the braking distance of the measured object according to the error distance and the measured distance.
8. The braking distance testing method according to claim 7, wherein the obtaining the error distance traveled by the object from the obtaining of the braking instruction to the executing of the braking instruction includes:
Acquiring the speed of the tested object before acquiring the braking instruction;
Acquiring a first duration from the acquisition of the brake instruction to the execution of the brake instruction of the object to be tested;
and determining an error distance according to the speed and the first time length.
9. The braking distance testing method according to claim 7, wherein the acquiring the measured distance of the object from the position at which the braking instruction is acquired to the object stop position includes:
Acquiring a first distance between the position of the measured object when acquiring the brake instruction and the first distance measuring module;
Acquiring a second distance between the stop position of the measured object and the first distance measuring module;
and determining the difference value between the first distance and the second distance as the measured distance.
10. The braking distance test method according to claim 7, wherein the acquiring the speed at which the object acquires the braking instruction includes:
Determining a second duration of receiving reflection data, wherein the reflection data is generated after a marker on the measured object reflects infrared data transmitted by a second ranging module;
the speed is determined based on a preset width of the marker and the second duration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311834225.2A CN118050180A (en) | 2023-12-27 | 2023-12-27 | Brake distance testing device, system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311834225.2A CN118050180A (en) | 2023-12-27 | 2023-12-27 | Brake distance testing device, system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118050180A true CN118050180A (en) | 2024-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311834225.2A Pending CN118050180A (en) | 2023-12-27 | 2023-12-27 | Brake distance testing device, system and method |
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| Country | Link |
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| CN (1) | CN118050180A (en) |
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2023
- 2023-12-27 CN CN202311834225.2A patent/CN118050180A/en active Pending
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