Simulation analysis and evaluation method for vehicle emergency braking working condition sensor sensing arrangement protection

Abstract

The present application relates to a kind of vehicle HDS sensor sensing arrangement protection simulation analysis and evaluation method under sudden braking condition, including boundary setting, simulation loading and result evaluation.This method selects multiple different sizes of luggage compartment to set HDS sensor collision impact block size;Impact angle is set as flat and angle two directions;Impact condition is set as sudden braking condition under the condition of high-speed driving of vehicle;Through the establishment of detailed simulation model of HDS sensor and HDS sensor fixing device, simulation analysis boundary is designed, the deformation posture of HDS under impact load in the process of sudden braking condition is simulated, and the simulation analysis precision is improved;Through the establishment of simulation analysis index of HDS sensor and HDS sensor fixing device, HDS sensor sudden braking condition simulation analysis standard is established, and HDS sensor sudden braking condition collision protection simulation analysis is realized;This method can reduce design redundancy, realize structure light weight and cost minimization.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology, specifically relating to a simulation analysis and evaluation method for the protection of HDS sensor arrangement under vehicle emergency braking conditions. Background Technology

[0002] As vehicles become increasingly electrified, intelligent, and connected, the number of related sensors is also increasing, and the placement requirements are becoming more complex. The existing space in the engine compartment and passenger compartment can no longer meet the needs. To solve this problem, the luggage compartment has been introduced as a new location for sensor placement.

[0003] HDS sensors are key sensors for Level 2 driving assistance and parking functions. Considering their requirements for heat dissipation and placement space, some vehicles place them in the trunk partition. To ensure their safety performance during daily use, they must be able to function normally even under sudden braking conditions, even if impacted by objects in the trunk. Summary of the Invention

[0004] The purpose of this invention is to provide a simulation analysis and evaluation method for the protection of HDS sensor arrangement under vehicle emergency braking conditions, so as to solve the problem of simulating the deformation posture of HDS under impact load during emergency braking, realize the collision protection simulation analysis of HDS sensor under emergency braking conditions, improve the accuracy of simulation analysis, and make the structure lightweight and minimize cost.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A method for simulation analysis and evaluation of HDS sensor layout protection under vehicle emergency braking conditions includes the following steps:

[0007] A. Boundary Setting

[0008] A1. Select multiple suitcases of different sizes, set the size of the HDS sensor collision impact block, and set the mass of the collision simulator;

[0009] A2. The impact angle is set to two directions: horizontal impact and corner impact;

[0010] A3. The impact condition is set as an emergency braking condition under high-speed vehicle driving conditions, with a deceleration of 1g during the emergency braking process;

[0011] B. Simulation Loading

[0012] B1. Establish a white body, HDS sensor and HDS sensor fixing device, and collision impact block half-vehicle model;

[0013] B2. The collision impact block is located at the rear of the trunk, and the impact angle is set to two directions: horizontal impact and corner impact.

[0014] B3. Establish the self-contact of the whole vehicle using the half-vehicle model, and set the friction coefficient to μ;

[0015] B4. The HDS sensor and the HDS sensor fixing device establish force measurement contact;

[0016] B5. Apply deceleration under emergency braking conditions to the half-vehicle model, with the loading position selected as the longitudinal beam of the vehicle body under the floor.

[0017] B6. Establish a local coordinate system in the non-deformable area of ​​the half-vehicle model;

[0018] C. Result Evaluation

[0019] C1. The contact force between the HDS sensor and the HDS sensor fixing device is zero;

[0020] C2, Strain of HDS sensor fixing device ≤ S;

[0021] C3, Deformation of HDS sensor fixing device ≤ D.

[0022] Further, in step A1, the suitcase size is selected as 20, 24, or 28 inches.

[0023] Further, in step A1, the collision simulator mass is set to 60kg.

[0024] Further, in step B2, the flat impact angle is when the luggage collision simulator is 100% aligned with the HDS sensor fixing device in the Y direction and located at the rear end of the trunk in the X direction; the corner impact angle is when the luggage collision simulator is 100% aligned with the HDS sensor fixing device in the Y direction and located at the rear end of the trunk in the X direction.

[0025] Further, in step B4, the HDS sensor and the HDS sensor mounting device establish force contact through PRIMER-CONTACT-FORCE_TRANSDUCER_PENALTY. The slave side selects the HDS sensor component through part id mode, and the master side selects the HDS sensor mounting device component through part id mode. This is used to evaluate whether contact occurs between the HDS sensor and the HDS sensor mounting device and the magnitude of the contact force.

[0026] Further, in step B5, the deceleration under emergency braking is applied to the half-vehicle model using the PRIMER-BOUNDRY-PRESCRIBED_MOTION function. The loading position is selected at the longitudinal beam of the vehicle body under the floor, and the loading point is selected according to the corresponding NODE using the NSID mode. The degrees of freedom of the half-vehicle model are restricted by DOF, with DOF set to 1, retaining only the X-direction degree of freedom. The loading mode is selected as acceleration using VAD, and the acceleration under emergency braking is applied using LCID.

[0027] Further, in step B6, by using PRIMER-DEFINE-COORDINATE and selecting DEFINE-COORDINATE-NODES, three NODEs are selected in sequence: the origin, the X-axis positioning point, and the Y-axis positioning point. A local coordinate system CSYS1 is then established in the non-deformable area of ​​the half-vehicle model.

[0028] Further, in step C1, based on the calculation results of the half-vehicle model, the contact force between the HDS sensor and the HDS sensor fixing device output by CONTACT-FO RCE_TRANSDUCER_PENALTY is read through IHIS. It is required that the contact force between the HDS sensor and the HDS sensor fixing device is zero, that is, the HDS sensor and the HDS sensor fixing device are not in contact.

[0029] Further, in step C2, based on the calculation results of the half-vehicle model, the strain of the HDS sensor fixing device is read through STRAIN-PLA STIC-STRAIN in D3PLOT with the mode selected as MAX ALL INT PTS. The strain of the HDS sensor fixing device should be ≤S. If the yield of the HDS sensor fixing device is ≤280MPa, S is recommended to be 20%. If the yield of the HDS sensor fixing device is ≥280MPa, S is recommended to be 10%.

[0030] Further, in step C3, based on the calculation results of the half-vehicle model, the deformation of the HDS sensor fixing device is output through Displacement_DX-X-DISPLACEMENT in D3PLOT and CSYS1 in USER-DEFINED in REF FRAME. It is required that the deformation of the HDS sensor fixing device ≤ D, where D is recommended to be the distance between the HDS sensor and the HDS sensor fixing device.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. This invention establishes a refined simulation model of the HDS sensor and its fixing device, designs simulation analysis boundaries, and simulates the deformation posture of the HDS under impact load during emergency braking, thereby improving the accuracy of simulation analysis.

[0033] 2. This invention establishes simulation analysis indicators for HDS sensors and HDS sensor fixing devices, and establishes simulation analysis standards for HDS sensors under emergency braking conditions, thus achieving a technological breakthrough in the simulation analysis of collision protection of HDS sensors under emergency braking conditions, starting from scratch.

[0034] 3. This invention reduces design redundancy and achieves lightweight structure and minimized cost by establishing a refined simulation analysis and evaluation method for HDS sensors and HDS sensor fixing devices. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 Flowchart of steps for simulation analysis and evaluation of sensor layout protection under vehicle emergency braking conditions;

[0037] Figure 2 Schematic diagram of a half-car model;

[0038] Figure 3 Schematic diagram of HDS sensor in luggage;

[0039] Figure 4 A schematic diagram of the collision simulation of the roll-to-roll collision angle;

[0040] Figure 5 A schematic diagram of the collision simulation corner angle. Detailed Implementation

[0041] The present invention will be further described below with reference to embodiments:

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0043] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] The simulation analysis and evaluation method is established as follows: First, data is collected; then, the analysis boundary is defined; next, the evaluation criteria are established; and finally, the results are analyzed. Since the HDS sensor is a key sensor for L2-level driving assistance and parking functions, considering its requirements for heat dissipation and placement space, some vehicles place it in the trunk partition. To ensure its safety performance during daily use, it must be guaranteed to maintain normal operation even under sudden braking conditions caused by impact from objects in the trunk.

[0045] Therefore, this invention provides a method for simulation analysis and evaluation of HDS sensor arrangement protection under vehicle emergency braking conditions, comprising the following steps:

[0046] I. Boundary Setting

[0047] 1. Select 20-inch, 24-inch, and 28-inch suitcases as the size of the HDS sensor collision impact block, and set the collision simulator mass to 60kg;

[0048] 2. The impact angle is set to two directions: horizontal impact and corner impact;

[0049] 3. The impact condition is set as an emergency braking condition under high-speed vehicle conditions, with a deceleration of 1g during the emergency braking process.

[0050] II. Simulation Loading

[0051] Take a 20-inch suitcase as an example:

[0052] 1. Establish a white body, HDS sensor and HDS sensor fixing device, and collision impact block half-vehicle model;

[0053] 2. The collision impact block is located at the rear of the trunk, and the impact angle is set to two directions: horizontal impact and corner impact;

[0054] 3. The half-vehicle model is established by creating the full vehicle self-contact using PRIMER-CONTACT-AUTOMATIC_SINGLE_SURFA CE, with the friction coefficient set to μ;

[0055] 4. The HDS sensor and the HDS sensor fixing device establish force contact through PRIMER-CONTACT-FORCE_TR ANSDUCER_PENALTY;

[0056] 5. Apply deceleration under emergency braking conditions to the half-vehicle model using the PRIMER-BOUNDRY-PRESCRIBED_MOTION function, with the loading position selected as the longitudinal beam of the vehicle body under the floor.

[0057] 6. Establish a local coordinate system CSYS1 in the non-deformable area of ​​the half-vehicle model using PRIMER-DEFINE-COORDINATE.

[0058] III. Results Evaluation

[0059] 1. The contact force between the HDS sensor and the HDS sensor fixing device is zero;

[0060] 2. The strain of the HDS sensor fixing device is ≤ S;

[0061] 3. The deformation of the HDS sensor fixing device is ≤D.

[0062] Example 1

[0063] A method for simulation analysis and evaluation of HDS sensor layout protection under vehicle emergency braking conditions includes the following steps:

[0064] I. Boundary Setting

[0065] Considering common usage scenarios and impact loads, 20, 24, and 28-inch suitcases were selected as the size of the HDS sensor collision impact block, and the collision simulator mass was set to 60kg.

[0066] Considering the characteristics of items placed in the trunk in actual use scenarios, the impact angles are set in two directions: horizontal impact and corner impact. The horizontal impact angle is when the trunk collision simulator is 100% aligned with the HDS sensor fixing device in the Y direction, and located at the rear end of the trunk in the X direction; the corner impact angle is when the trunk collision simulator is 100% aligned with the HDS sensor fixing device in the Y direction, and located at the rear end of the trunk in the X direction.

[0067] The impact condition is an emergency braking situation under high-speed vehicle conditions, with a deceleration of 1g during the emergency braking process.

[0068] II. Simulation Loading

[0069] Taking a 20-inch suitcase as an example, the simulation methods and evaluation rules for 24-inch and 28-inch suitcases are the same.

[0070] Establish a white body, HDS sensors and their mounting devices, and a half-vehicle model of the collision impact block. Material and thickness information should be assigned according to actual conditions. Figure 2 As shown.

[0071] The collision impact block is located at the rear of the trunk. The impact angles are set in two directions: a level impact and a corner impact. For the level impact, the luggage compartment collision simulator is 100% aligned with the HDS sensor fixing device in the Y-direction, and the impact point is at the rear end of the trunk in the X-direction. For the corner impact, the luggage compartment collision simulator is 100% aligned with the HDS sensor fixing device in the Y-direction, and the impact point is at the rear end of the trunk in the X-direction. Figure 3 As shown.

[0072] The half-vehicle model establishes full-vehicle self-contact through PRIMER-CONTACT-AUTOMATIC_SINGLE_SURFACE. The slave side selects all part numbers that need to be contacted through part set mode, and the friction coefficient is set to μ, with μ recommended to be 0.3.

[0073] The HDS sensor and the HDS sensor mounting device establish force contact through PRIMER-CONTACT-FORCE_TR ANSDUCER_PENALTY. The slave side selects the HDS sensor component using the part id mode, and the master side selects the HDS sensor mounting device component using the part id mode. This is used to evaluate whether contact occurs between the HDS sensor and the HDS sensor mounting device and the magnitude of the contact force.

[0074] The PRIMER-BOUNDRY-PRESCRIBED_MOTION function was used to apply deceleration under emergency braking to the half-vehicle model. The loading location was selected at the longitudinal beam of the vehicle body under the floor. The loading point was selected at the corresponding node using NSID mode. The degrees of freedom of the half-vehicle model were restricted using DOF, with DOF set to 1, retaining only the X-axis degree of freedom. The loading mode was selected as acceleration using VAD, and the acceleration under emergency braking was applied using LCID. Figure 2 As shown.

[0075] Using PRIMER-DEFINE-COORDINATE, with the mode selected as DEFINE-COORDINAT E-NODES, three NODEs are selected in sequence: the origin, the X-axis positioning point, and the Y-axis positioning point. A local coordinate system CSYS1 is then established in the non-deformable area of ​​the half-vehicle model.

[0076] III. Result Evaluation: Based on the calculation results of the half-vehicle model, the contact force between the HDS sensor and the HDS sensor fixing device output by CONTACT-FORCE_TRANSDUCER_PENALTY is read through IHIS. It is required that the contact force between the HDS sensor and the HDS sensor fixing device is zero, that is, there is no contact between the HDS sensor and the HDS sensor fixing device.

[0077] Based on the calculation results of the half-vehicle model, the strain of the HDS sensor fixing device was read through STRAIN-PLASTIC-STRAIN in D3PLOT with the mode set to MAXALL INT PTS. The strain of the HDS sensor fixing device should be ≤S. If the yield of the HDS sensor fixing device is ≤280MPa, S is recommended to be 20%. If the yield of the HDS sensor fixing device is ≥280MPa, S is recommended to be 10%.

[0078] Based on the calculation results of the half-vehicle model, the deformation of the HDS sensor fixing device is output through Displacement_DX-X-DISPLACE MENT in D3PLOT and CSYS1 in USER-DEFINED in REFFRAME. It is required that the deformation of the HDS sensor fixing device ≤ D, where D is recommended to be the distance between the HDS sensor and the HDS sensor fixing device.

[0079] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A method for simulation analysis and evaluation of the protection of HDS sensor arrangement under vehicle emergency braking conditions, characterized in that, Includes the following steps: A. Boundary Setting A1. Select multiple suitcases of different sizes, set the size of the HDS sensor collision impact block, and set the mass of the collision simulator; A2. The impact angle is set to two directions: horizontal impact and corner impact; A3. The impact condition is set as an emergency braking condition under high-speed vehicle driving conditions, with a deceleration of 1g during the emergency braking process; B. Simulation Loading B1. Establish a white body, HDS sensor and HDS sensor fixing device, and collision impact block half-vehicle model; B2. The collision impact block is located at the rear of the trunk, and the impact angle is set to two directions: horizontal impact and corner impact. B3. Establish the self-contact of the whole vehicle using the half-vehicle model, and set the friction coefficient to μ; B4. The HDS sensor and the HDS sensor fixing device establish force measurement contact; B5. Apply deceleration under emergency braking conditions to the half-vehicle model, with the loading position selected as the longitudinal beam of the vehicle body under the floor. B6. Establish a local coordinate system in the non-deformable area of ​​the half-vehicle model; C. Result Evaluation C1. The contact force between the HDS sensor and the HDS sensor fixing device is zero; C2, Strain of HDS sensor fixing device ≤ S; C3, Deformation of HDS sensor fixing device ≤ D.

2. The method for simulation analysis and evaluation of HDS sensor arrangement protection under vehicle emergency braking conditions according to claim 1, characterized in that: Step A1, the suitcase size is selected as 20, 24, or 28 inches.

3. The method for simulation analysis and evaluation of HDS sensor arrangement protection under vehicle emergency braking conditions according to claim 1, characterized in that: Step A1: Set the collision simulator mass to 60kg.

4. The method for simulation analysis and evaluation of HDS sensor arrangement protection under vehicle emergency braking conditions according to claim 1, characterized in that: Step B2: The flat impact angle is when the luggage collision simulator is 100% aligned with the HDS sensor fixing device in the Y direction and located at the rear end of the trunk in the X direction; the corner impact angle is when the luggage collision simulator is 100% aligned with the HDS sensor fixing device in the Y direction and located at the rear end of the trunk in the X direction.

5. The method for simulation analysis and evaluation of HDS sensor arrangement protection under vehicle emergency braking conditions according to claim 1, characterized in that: Step B4: The HDS sensor and the HDS sensor mounting device establish force contact through PRIMER-CONTACT-FORCE_TRANSDUCER_PENALTY. The slave side selects the HDS sensor component through part id mode, and the master side selects the HDS sensor mounting device component through part id mode. This is used to evaluate whether contact occurs between the HDS sensor and the HDS sensor mounting device and the magnitude of the contact force.

6. The method for simulation analysis and evaluation of HDS sensor arrangement protection under vehicle emergency braking conditions according to claim 1, characterized in that: Step B5: Apply deceleration under emergency braking conditions to the half-vehicle model using the PRIMER-BOUNDRY-PRESCRI BED_MOTION function. Select the loading location as the longitudinal beam of the vehicle body under the floor, and select the corresponding NODE for the loading point using NSID mode. Restrict the degrees of freedom of the half-vehicle model using DOF, with DOF set to 1, retaining only the X-direction degree of freedom. Select acceleration as the loading mode using VAD, and apply acceleration under emergency braking conditions using LCID.

7. The method for simulation analysis and evaluation of HDS sensor arrangement protection under vehicle emergency braking conditions according to claim 1, characterized in that: Step B6: Using PRIMER-DEFINE-COORDINATE TE, select DEFINE-COORDINATE-NODES mode, and sequentially select the coordinate origin, X-axis positioning point, and Y-axis positioning point to establish a local coordinate system CSYS1 in the non-deformable area of ​​the half-vehicle model.

8. The method for simulation analysis and evaluation of HDS sensor arrangement protection under vehicle emergency braking conditions according to claim 1, characterized in that: Step C1: Based on the calculation results of the half-vehicle model, read the contact force between the HDS sensor and the HDS sensor fixing device output by CONTACT-FORCE_TRANSDUCER_PENALTY through IHIS. It is required that the contact force between the HDS sensor and the HDS sensor fixing device is zero, that is, there is no contact between the HDS sensor and the HDS sensor fixing device.

9. The method for simulation analysis and evaluation of HDS sensor arrangement protection under vehicle emergency braking conditions according to claim 1, characterized in that: Step C2: Based on the calculation results of the half-vehicle model, read the strain of the HDS sensor fixing device through STRAIN-PLASTIC-STRAIN in D3PL OT, with the mode selected as MAX ALL INT PTS. The strain of the HDS sensor fixing device should be ≤S. If the yield of the HDS sensor fixing device is ≤280MPa, S is recommended to be 20%. If the yield of the HDS sensor fixing device is ≥280MPa, S is recommended to be 10%.

10. The method for simulation analysis and evaluation of HDS sensor arrangement protection under vehicle emergency braking conditions according to claim 1, characterized in that: Step C3: Based on the calculation results of the half-vehicle model, output the deformation of the HDS sensor fixing device through Displacement_DX-X-DISPLACEMENT in D3PL OT and CSYS1 in USER-DEFINE D in REF FRAME. The deformation of the HDS sensor fixing device should be ≤D, where D is recommended to be the distance between the HDS sensor and the HDS sensor fixing device.

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