Device and method for testing active safety protection function for pedestrians behind vehicle

Abstract

The invention relates to a device and a method for testing an active safety protection function for pedestrians behind a vehicle. The test device comprises a guide rail mechanism, a target dummy, a camera support and a test computer. The testing method comprises the following steps: fixing the reversing camera device on the camera bracket; setting a dummy initial position, a camera initial position, a dummy moving track and moving speed, and a camera moving track and moving speed in a test computer; starting the reversing camera device and the guide rail mechanism to enable the target dummy and the reversing camera device to move according to a preset track and speed; the test computer detects whether the reversing camera device sends a brake request signal or not when a collision risk occurs; if the brake request signal is sent, the test result is qualified, and if the brake request signal is not sent, the test result is unqualified. During testing, complete running and braking functions of the whole vehicle are not needed, participation of the whole vehicle is also not needed, and the method is suitable for early functional verification of camera part development.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle safety testing, and in particular to a testing device and method for an active safety protection function of pedestrians behind a vehicle. Background Art

[0002] As assisted driving functions become more and more sophisticated, the requirements for active vehicle safety are also getting higher and higher. Active safety protection for pedestrians behind the vehicle will also appear as a test item in C-NCAP2025 and CIASI3.0.

[0003] At present, the testing of active safety functions for rear pedestrians in vehicles generally adopts the method of testing in an open field with a real vehicle and a dummy. Since the whole vehicle needs to have mature driving and braking functions, this testing method is not suitable for early functional development. For example, since the reversing camera device and other controllers on the whole vehicle are developed simultaneously, it is difficult to have a fully functional whole vehicle environment for testing in the early stage of camera parts development.

[0004] In view of the above problems, the inventors of the present invention finally obtained the present invention after a long period of research and practice. Summary of the invention

[0005] In order to solve at least one aspect of the above technical problems, the present invention provides a testing device and method for the active safety protection function of pedestrians behind a vehicle. During the test, the driving and braking functions of the entire vehicle do not need to be perfect, nor does the entire vehicle need to be involved. It is suitable for functional verification in the early stage of camera parts development.

[0006] The technical solution adopted by the present invention is:

[0007] On the one hand, a test device for active safety protection function of pedestrians behind a vehicle is provided, comprising: a guide rail mechanism, a target dummy, a camera bracket and a test computer;

[0008] The camera bracket is used to fix the reversing camera device;

[0009] The target dummy and the camera bracket are both mounted on the guide rail mechanism, and the target dummy and the camera bracket can move arbitrarily in the XY coordinate system formed by the guide rail mechanism;

[0010] The test computer is connected to the reversing camera device and the guide rail mechanism, and is used for receiving a brake request signal sent by the reversing camera device, and controlling the moving track and moving speed of the target dummy and the camera bracket.

[0011] Further, the guide rail mechanism includes an X-guide rail and a Y-guide rail arranged orthogonally;

[0012] The Y guide rail can be displaced in the X direction along the X guide rail, and the Y guide rail includes a first Y guide rail and a second Y guide rail arranged in parallel; the target dummy is arranged on the first Y guide rail and can be displaced in the Y direction along the first Y guide rail; the camera bracket is arranged on the second Y guide rail and can be displaced in the Y direction along the second Y guide rail.

[0013] Further, the guide rail mechanism includes an X-guide rail and a Y-guide rail arranged orthogonally;

[0014] The X-guide rail can be displaced in the Y direction along the Y-guide rail, and the X-guide rail includes a first X-guide rail and a second X-guide rail arranged in parallel; the target dummy is arranged on the first X-guide rail and can be displaced in the X direction along the first X-guide rail; the camera bracket is arranged on the second X-guide rail and can be displaced in the X direction along the second X-guide rail.

[0015] On the other hand, a method for testing the active safety protection function of pedestrians behind a vehicle is provided, using the above-mentioned testing device for the active safety protection function of pedestrians behind a vehicle;

[0016] The steps include:

[0017] Step 1. Fix the reversing camera device on the camera bracket;

[0018] Step 2. Set the dummy's initial position, the camera's initial position, the dummy's moving trajectory and moving speed, and the camera's moving trajectory and moving speed in the test computer;

[0019] Step 3. Start the reversing camera device and the guide rail mechanism to make the target dummy and the reversing camera device move according to the preset trajectory and speed;

[0020] Step 4. Test computer detection: when a collision risk occurs, whether the reversing camera device sends out a brake request signal; if a brake request signal is sent, the test result is qualified, if not, the test result is unqualified.

[0021] Furthermore, in step 4, the test computer can calculate the time and number of times the brake request signal should be received according to the design requirements of the risk of collision between the vehicle and the pedestrian, and based on the preset dummy initial position, camera initial position, dummy movement trajectory and movement speed, camera movement trajectory and movement speed. If the time and number of times the brake request signal is actually received are consistent, the test result is qualified; otherwise, it is unqualified.

[0022] Furthermore, in step 3, the preset camera movement trajectory and movement speed are used to simulate the reverse movement of a real vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of a testing device according to an embodiment of the present invention is shown;

[0025] Figure 2 A flow chart showing a testing method according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0026] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0027] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". Other explicit and implicit definitions may also be included below.

[0028] At present, there are two main technical solutions for active safety protection of pedestrians behind vehicles: one is a camera-based technical solution, and the other is a radar-based technical solution. The test device and test method of the present invention are aimed at the camera-based technical solution.

[0029] The implementation principle of the camera-based rear pedestrian protection function is as follows: the reversing camera device is installed on the rear cover or rear bumper of the vehicle. The reversing camera device includes a camera and a computing module integrated therewith. When the vehicle is reversing, the camera collects images and uses the image recognition algorithm of the computing module to identify pedestrians behind the vehicle and evaluate the collision risk between the vehicle and the pedestrians. When the risk is greater than a predetermined value, the reversing camera device will send a brake request signal, and the vehicle will brake in response to the brake request to protect the pedestrians.

[0030] like Figure 1As shown, in this embodiment, a test device for active safety protection function of pedestrians behind a vehicle is provided, comprising: a guide rail mechanism, a target dummy 3, a camera bracket 4 and a test computer 5. The camera bracket 4 is used to fix the reversing camera device 6; the target dummy 3 and the camera bracket 4 are both installed on the guide rail mechanism, and the target dummy 3 and the camera bracket 4 can move arbitrarily in the XY coordinate system formed by the guide rail mechanism. The test computer 5 is connected to the reversing camera device 6 and the guide rail mechanism through a wiring harness, and the test computer 5 is used to receive a brake request signal sent by the reversing camera device 6, and control the moving trajectory and moving speed of the target dummy 3 and the camera bracket 4.

[0031] In a specific embodiment, the guide rail mechanism includes an X-direction guide rail 1 and a Y-direction guide rail 2 arranged orthogonally. The Y-direction guide rail 2 can be displaced in the X direction along the X-direction guide rail 1, and the Y-direction guide rail includes a first Y-direction guide rail 22 and a second Y-direction guide rail 21 arranged in parallel. The target dummy 3 is arranged on the first Y-direction guide rail 22 and can be displaced in the Y direction along the first Y-direction guide rail 22. The camera bracket 4 is arranged on the second Y-direction guide rail 21 and can be displaced in the Y direction along the second Y-direction guide rail 21. It can be understood that the guide rails in the X direction and the Y direction are orthogonal, and the dummy is arranged on the Y-direction guide rail. The X-direction guide rail can control the dummy to move along the X direction together with the Y-direction guide rail, and the Y-direction guide rail can control the dummy to move along the Y direction. The test computer can control the movement direction and speed of the dummy in real time and obtain current position feedback. Similarly, the camera is arranged on another Y-direction guide rail, and the X-direction guide rail can control the camera to move along the X direction together with the Y-direction guide rail, and the Y-direction guide rail can control the camera to move along the Y direction. The test computer can control the movement direction and speed of the camera in real time and obtain current position feedback.

[0032] In another specific embodiment, the X-guide rail can be displaced in the Y direction along the Y-guide rail, and the X-guide rail includes a first X-guide rail and a second X-guide rail arranged in parallel. The target dummy is arranged on the first X-guide rail and can be displaced in the X direction along the first X-guide rail. The camera bracket is arranged on the second X-guide rail and can be displaced in the X direction along the second X-guide rail. The test computer can control the movement direction and speed of the dummy and the camera in real time and obtain current position feedback.

[0033] In the above embodiment, the functions of the test computer are: 1. Run the corresponding engineering files and provide the interactive signal environment required for the camera to work, so that the camera device can work alone. 2. Control the position and movement speed of the camera to simulate the reverse movement of the real car. 3. Control the position and movement speed of the dummy. 4. Detect whether the camera sends a brake request signal.

[0034] like Figure 2As shown, in one embodiment, a method for testing the active safety protection function of pedestrians behind a vehicle is provided, using the above-mentioned testing device. The method comprises the following steps:

[0035] 1. Fix the reversing camera device on the camera bracket;

[0036] 2. Set the dummy's initial position, camera's initial position, dummy's moving trajectory and moving speed, camera's moving trajectory and moving speed in the test computer;

[0037] 3. Start the reversing camera device and the guide rail mechanism to make the target dummy and the reversing camera device move according to the preset trajectory and speed; the preset camera movement trajectory and movement speed are used to simulate the reversing movement of the real vehicle;

[0038] 4. Test computer detection: When there is a risk of collision, whether the reversing camera device sends out a brake request signal; if a brake request signal is sent, the test result is qualified; if no brake request signal is sent, the test result is unqualified.

[0039] In some embodiments, the test computer can calculate the time and number of times the brake request signal should be received based on the design requirements of the risk of collision between the vehicle and the pedestrian, and based on the preset initial position of the dummy, the initial position of the camera, the movement trajectory and movement speed of the dummy, and the movement trajectory and movement speed of the camera. If the time and number of times the brake request signal is actually received are consistent, the test result is qualified, otherwise it is unqualified. For example, the collision risk judgment logic in the calculation module of the reversing camera device can be used to calculate the time and number of times the brake request signal should be received.

[0040] The testing device and method of the present invention use speed signals instead of the actual movement of the vehicle when testing the active safety protection function of rear pedestrians. When evaluating the test results, it is detected whether the brake signal is received in time, rather than observing whether a collision occurs. The active safety protection function of rear pedestrians of the vehicle can be tested without the participation of the entire vehicle.

[0041] Any process or method description in the flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes additional implementations, in which the order shown or discussed may not be followed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0042] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processing module, or other system that can fetch instructions from an instruction execution system, apparatus or device and execute instructions), or used in combination with these instruction execution systems, apparatuses or devices.

[0043] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. The structures and connection modes of the components in the present invention can be changed, and any equivalent transformations and improvements based on the technical solution of the present invention should not be excluded from the protection scope of the present invention.

Claims

1. A test device for active safety protection function of pedestrians behind a vehicle, characterized in that: include: Guide rail mechanism, target dummy, camera bracket and test computer; The camera bracket is used to fix the reversing camera device; The target dummy and the camera bracket are both mounted on the guide rail mechanism, and the target dummy and the camera bracket can move arbitrarily in the XY coordinate system formed by the guide rail mechanism; The test computer is connected to the reversing camera device and the guide rail mechanism, and is used for receiving a brake request signal sent by the reversing camera device, and controlling the moving track and moving speed of the target dummy and the camera bracket.

2. A testing device for active safety protection function of pedestrians behind a vehicle as claimed in claim 1, characterized in that: The guide rail mechanism includes an X-guide rail and a Y-guide rail arranged orthogonally; The Y guide rail can be displaced in the X direction along the X guide rail, and the Y guide rail includes a first Y guide rail and a second Y guide rail arranged in parallel; the target dummy is arranged on the first Y guide rail and can be displaced in the Y direction along the first Y guide rail; the camera bracket is arranged on the second Y guide rail and can be displaced in the Y direction along the second Y guide rail.

3. A testing device for active safety protection function of pedestrians behind a vehicle as claimed in claim 1, characterized in that: The guide rail mechanism includes an X-guide rail and a Y-guide rail arranged orthogonally; The X-guide rail can be displaced in the Y direction along the Y-guide rail, and the X-guide rail includes a first X-guide rail and a second X-guide rail arranged in parallel; the target dummy is arranged on the first X-guide rail and can be displaced in the X direction along the first X-guide rail; the camera bracket is arranged on the second X-guide rail and can be displaced in the X direction along the second X-guide rail.

4. A test method for active safety protection function of pedestrians behind a vehicle, characterized in that: A test device for active safety protection function of pedestrians behind a vehicle as described in any one of claims 1 to 3 is used; The steps include: Step 1. Fix the reversing camera device on the camera bracket; Step 2. Set the dummy's initial position, the camera's initial position, the dummy's moving trajectory and moving speed, and the camera's moving trajectory and moving speed in the test computer; Step 3. Start the reversing camera device and the guide rail mechanism to make the target dummy and the reversing camera device move according to the preset trajectory and speed; Step 4. Test computer detection: when a collision risk occurs, whether the reversing camera device sends out a brake request signal; if a brake request signal is sent, the test result is qualified, if not, the test result is unqualified.

5. A method for testing the active safety protection function of pedestrians behind a vehicle as claimed in claim 4, characterized in that: In step 4, the test computer can calculate the time and number of times the brake request signal should be received according to the design requirements of the risk of collision between the vehicle and the pedestrian, and based on the preset dummy initial position, camera initial position, dummy movement trajectory and movement speed, camera movement trajectory and movement speed. If the time and number of times the brake request signal is actually received are consistent, the test result is qualified, otherwise it is unqualified.

6. A method for testing active safety protection function for pedestrians behind a vehicle as claimed in claim 4, characterized in that: In step 3, the preset camera movement trajectory and movement speed are used to simulate the reverse movement of a real vehicle.

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