High-precision vehicle sensing device and method for forced parking device

Abstract

According to the high-precision vehicle sensing device and method for the forced parking device, a T-shaped mounting plate is fixed to a target parking space, a pressure bearing shaft is movably arranged on the T-shaped mounting plate, at least two pressure bearing plates are fixed to the T-shaped mounting plate through concave mounting blocks, at least two pressure plates are arranged on the pressure bearing shaft, and the tail ends of the pressure plates are arranged on the pressure bearing plates; the limiting support is arranged on the pressure bearing shaft, the stroke detector is arranged on the T-shaped mounting plate through the mounting support and matched with the limiting support, and the top protection plate is arranged on the pressure plate and moves synchronously with the pressure plate. According to the invention, a mechanical pressure sensing structure and an intelligent pressure forming value setting method are used to solve the pain point in the prior art. Compared with an easily-interfered infrared sensing device, a pure mechanical transmission path is adopted, only the wheel pressure of the vehicle is responded, the anti-interference performance is high, the sensing precision is high, and misjudgment and missed judgment are avoided; compared with a ground induction coil scheme needing to damage the ground, the device is directly fixed through the T-shaped mounting plate, complex construction is not needed, the maintenance cost is low, the ground adaptability is high, and the mounting and maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of parking lock, in particular to a high-precision vehicle sensing device and method for a mandatory parking lock. BACKGROUND

[0002] The parking lock is a device used to prevent vehicles from being stolen or accidentally moving in outdoor parking lots, roadside parking spaces and other scenarios. One of its core functions is to accurately sense whether the vehicle has been correctly parked at the target position, so as to trigger the subsequent parking locking action. However, the vehicle sensing device in the prior art has many shortcomings: for example, the device using infrared sensing is easily disturbed by environmental light (such as strong light, rainy weather), obstacles and other factors, resulting in a decrease in sensing accuracy and false positives or false negatives; the device using a ground inductive coil needs to be pre-buried and installed by damaging the ground, which is difficult to construct and has high maintenance costs, and it is not suitable for vehicles with different wheelbases and track widths, making it difficult to meet the needs of various parking scenarios. The application number 202511205628X, a method and system for unattended urban roadside parking charging, detects through geomagnetic and radar, therefore, there is an urgent need for a high-precision vehicle sensing device and method that can overcome the above-mentioned defects to improve the reliability and adaptability of the parking lock in different environments and scenarios. SUMMARY

[0003] The present application aims to at least solve the technical problems existing in the prior art, and particularly innovatively proposes a high-precision vehicle sensing device and method for a mandatory parking lock.

[0004] In order to achieve the above-mentioned purpose of the present application, the present application provides a high-precision vehicle sensing device for a mandatory parking lock, which comprises: A T-shaped mounting plate fixedly installed on the target parking space; A pressure bearing shaft movably arranged on the T-shaped mounting plate; At least two pressure bearing plates, each of which is fixed to the T-shaped mounting plate through two concave mounting blocks; At least two pressure plates arranged on the pressure bearing shaft and having their distal ends arranged on the pressure bearing plates; A limiting support arranged on the pressure bearing shaft; A stroke detector arranged on the T-shaped mounting plate through a mounting support and cooperating with the limiting support; A top guard plate arranged on the pressure plate and moving synchronously with the pressure plate.

[0005] As an optional embodiment of the present application, the stroke detector is an optional stroke switch.

[0006] In another aspect, the application also provides a high-precision vehicle sensing method for a mandatory parking device, applied to the device, the method comprising: Setting the pressure value of each pressure plate as n; When the actual pressure value is greater than n, the pressure plate bends downward, the pressure shaft moves downward, and the limit support moves downward synchronously; When the travel detector detects the limit support moving downward synchronously signal, the travel detector sends a vehicle parking signal to the controller; The controller sends a start command to the driver within a set time based on the vehicle parking signal; Based on the start command, the driver controls the turning box to turn the flap upward.

[0007] As another optional embodiment of the application, optionally, setting the pressure value of each pressure plate comprises: Determining the type of vehicle that the target parking space is suitable for, and obtaining the minimum static pressure value of a single wheel of the type of vehicle; Based on the material mechanics parameters and structural dimensions of the pressure plate and the minimum static pressure value of the single wheel, the pressure threshold value required for the pressure plate to bend downward by a preset amount is calculated through a mechanics model as an initial pressure value; Field loading test is performed on the pressure plate to simulate the single wheel pressure action when the vehicle is parked, and the actual pressure value when the pressure plate bends downward to trigger the pressure shaft to move and make the travel detector reliably output a signal is recorded; Comparing the initial pressure value with the field test value, repeatedly adjusting the pressure value to an optimal value that meets the material mechanics performance requirements of the pressure plate and ensures that the travel detector reliably outputs a signal; Repeat the above steps for each pressure plate to complete the individual setting of the pressure values of all pressure plates.

[0008] As another optional embodiment of the application, optionally, based on the material mechanics parameters and structural dimensions of the pressure plate and the minimum static pressure value of the single wheel, the pressure threshold value required for the pressure plate to bend downward by a preset amount is calculated through a mechanics model as an initial pressure value, which comprises: Obtaining the material mechanics parameters and structural dimension parameters of the pressure plate; Establishing a deflection and pressure relationship model based on the material mechanics parameters and structural dimension parameters; Based on the deflection and pressure relationship model, inputting a preset bending amount, and through the pressure relationship model, the corresponding pressure value is calculated to determine the initial pressure value required for the pressure plate to bend downward by the preset amount.

[0009] As another optional embodiment of the present application, optionally, the mathematical expression of the deflection-pressure relationship model is: F=(48*E*I*f) / L³, wherein F is the actual pressure value borne by the pressure plate, E is the elastic modulus of the pressure plate material, I is the moment of inertia of the pressure plate section, f is the preset deflection of the pressure plate, and L is the effective support span of the pressure plate, i.e., the distance between the two concave mounting blocks.

[0010] The present application has the following advantages: the present application effectively solves the key pain points in the prior art through the mechanical pressure sensing structure and the intelligent pressure value setting method. Compared with the infrared sensing device which is easily disturbed by environmental light and obstacles, the present application adopts a pure mechanical transmission path of the pressure plate-pressure bearing shaft-travel detector, only responds to the vehicle wheel pressure, has strong anti-interference ability and high sensing accuracy, avoids the misjudgment and missed judgment problems in rainy weather or strong light environment, and greatly reduces the installation difficulty and the later maintenance cost. At the same time, the initial pressure value is calculated based on the vehicle type, material mechanics parameters and structure size, and is dynamically adjusted to the optimal value through the field loading test, which not only ensures the reliable triggering of the pressure plate under the preset deflection, but also adapts to the differentiated pressure characteristics of vehicles with different wheelbases and track widths, and improves the adaptability of the device to diversified parking scenes. Finally, when the actual pressure of the vehicle exceeds the set threshold, the system can quickly trigger the flap rotation through the linkage mechanism of the travel detector-controller-driver, realize accurate and efficient vehicle parking sensing and parking locking action, and significantly improve the reliability and adaptability of the parking lock in different environments and scenes.

[0011] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0012] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings. Figure 1 is a structural schematic diagram of a high-precision vehicle sensing device for a forced parking lock according to the present application; Figure 2 is a structural schematic diagram of a high-precision vehicle sensing device for a forced parking lock according to the present application.

[0013] In the figure: 1, T-shaped mounting plate, 2, pressure plate, 3, concave mounting block, 4, pressure plate, 5, pressure bearing shaft, 6, limit support, 7, travel detector, 8, mounting support, 9, flap, 10, driver, 11, rotating box, 12, top guard plate. DETAILED DESCRIPTION

[0014] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like component having the same or similar designations are used to designate throughout the accompanying drawings the same or like components or elements having the same or similar functionalities. The embodiments described below are exemplary only, and are not to be construed as limiting the present application.

[0015] Embodiment 1 As shown in Figure 1 and 2 , a high-precision vehicle sensing device for a mandatory parking brake, the device comprising: A T-shaped mounting plate 1 is fixedly mounted on the target parking space; the T-shaped mounting plate 1 of the present embodiment is fixed on the target parking space transversely by a plurality of expansion screws.

[0016] A pressure-bearing shaft 5 is movably arranged on the T-shaped mounting plate 1; As shown in Figure 2 , the pressure-bearing shaft 5 is installed through the T-shaped mounting plate 1, and both ends of the pressure-bearing shaft 5 can move within a controllable range, and it is suspendedly installed in the initial state due to the action of the pressure plate 2; At least two pressure plates 2, each of which is fixed to the T-shaped mounting plate 1 by two concave mounting blocks 3; as shown in Figure 2 , each pressure plate 2 is fixedly clamped on the T-shaped mounting plate 1 by two concave mounting blocks 3, and each concave mounting block 3 is welded to the T-shaped mounting plate 1; At least two pressure plates 4 are arranged on the pressure-bearing shaft 5, and the distal end is arranged on the pressure plate 2; As shown in Figure 2 , the present embodiment is provided with three pressure plates 4, the number of which corresponds to the pressure plate 2, one end of the pressure plate 4 is welded to the pressure plate 2, and the other end is movably connected to the T-shaped mounting plate 1 through a hinge with a reinforced structure, and when the pressure plate 4 is subjected to a pressure greater than its bearing range, it can rotate downward; the pressure-bearing shaft 5 is welded to the pressure plate 4.

[0017] A limiting support 6 is arranged on the pressure-bearing shaft 5; As shown in Figure 1 , the limiting support is fixed on the pressure-bearing shaft 5 by welding, and the top thereof cooperates with the stroke detector 7, and the specific structure thereof is shown in Figure 1 .

[0018] A stroke detector 7 is arranged on the T-shaped mounting plate 1 by a mounting bracket 8, and cooperates with the limiting support 6.

[0019] As shown in Figure 1As shown, the limit detector 7 in this embodiment is a limit switch used to detect whether the limit bracket 6 moves downward.

[0020] The top guard plate (12) is disposed on the pressure plate (4) and moves synchronously with the pressure plate (4).

[0021] like Figure 1 As shown, the top guard plate (12) is welded to the pressure plate (4); like Figure 1 and 2 As shown, in this embodiment, when a vehicle runs over the top guard plate (12), the top guard plate (12) moves downward synchronously with the pressure plate (4), and the pressure plate (4) transmits the pressure of the vehicle's single wheel to the pressure plate (2). If the pressure is greater than the preset pressure value n of the pressure plate (2), the pressure plate (2) bends downward by a preset amount, thereby pushing the pressure shaft (5) to move downward along the movement path of the T-shaped mounting plate (1), and the limit bracket (6) fixed on the pressure shaft (5) moves downward synchronously. At this time, the travel detector (7) (travel switch) that cooperates with the limit bracket (6) is triggered and immediately sends a vehicle parking signal to the controller. After receiving the signal, the controller sends a start command to the driver (10) according to the preset response time (e.g., 300 seconds). The driver (10) drives the transmission mechanism inside the rotating box (11) to rotate, and controls the flip plate (9) to rotate upward at a preset angle (e.g., 45°) to complete the triggering action of parking lock. Throughout the process, the downward bending of the pressure plate (2) is strictly controlled within the allowable range of the material's mechanical properties to ensure the stability and reliability of the device during long-term use.

[0022] Example 2 A high-precision vehicle sensing method for a forced parking brake, applied to the aforementioned device, the method comprising: S1. Set the pressure value of each pressure plate 2 to n; Setting the pressure value for each bearing plate 2 in step S1 includes: S101. Determine the vehicle type suitable for the target parking space and obtain the minimum static pressure value of a single wheel for that type of vehicle. In step S101, it needs to be specified that the hydraulic device is used to apply a gradual pressure to the pressure plate, simulating the dynamic process of slowly parking a single wheel of a vehicle onto the pressure plate; the deflection change of the pressure plate 2 (through a laser displacement sensor), the displacement amount of the pressure shaft (through a linear encoder), and the signal output state of the travel detector are monitored in real time during the loading process; when the travel detector first stably outputs a high-level signal, the pressure value displayed by the hydraulic loading device at this time is immediately recorded as the actual test value; the loading test is repeated 3-5 times, and the average value of the test values is taken to eliminate accidental errors; at the same time, it is observed whether plastic deformation or cracks appear on the surface of the pressure plate 2 to ensure that the mechanical properties of the pressure plate 2 are not damaged during the test process.

[0023] In step S102, based on the material mechanics parameters and structural size of the pressure plate 2 and the minimum static pressure value of the single wheel, the pressure threshold value required for the pressure plate 2 to occur a preset downward bending amount is calculated through a mechanical model as an initial pressure value. As another optional embodiment of the present application, optionally, in step S102, based on the material mechanics parameters and structural size of the pressure plate 2 and the minimum static pressure value of the single wheel, the pressure threshold value required for the pressure plate 2 to occur a preset downward bending amount is calculated through a mechanical model as an initial pressure value, including: In step S1021, the material mechanics parameters and structural size parameters of the pressure plate 2 are obtained. In step S1021, it needs to be specified that the material mechanics parameters of the pressure plate include but are not limited to the elastic modulus E, the Poisson's ratio v, and the yield strength s, which can be obtained by referring to the material inspection report provided by the supplier of the metal material (such as Q235 carbon structural steel) used; the structural size parameters include the effective support span L (i.e. the center distance between the two concave mounting blocks), the width W and the thickness H of the pressure plate, wherein the effective support span L is measured by a laser range finder to measure the horizontal distance inside the concave mounting block, the width W and the thickness H are measured 3-5 times at different positions of the pressure plate by a vernier caliper with an accuracy of 0.02 mm, and the arithmetic mean value is taken as the final size parameter.

[0024] In step S1022, a deflection and pressure relationship model is established based on the material mechanics parameters and structural size parameters; the mathematical expression of the deflection and pressure relationship model is: F=(48xExIxf) / L³, wherein F is the actual pressure value borne by the pressure plate 2, E is the elastic modulus of the material of the pressure plate 2, I is the moment of inertia of the cross section of the pressure plate 2, f is the preset downward bending deflection of the pressure plate 2, and L is the effective support span of the pressure plate 2, i.e. the distance between the two concave mounting blocks.

[0025] The calculation of the moment of inertia I needs to be based on the rectangular cross-sectional characteristics of the pressure plate, and the specific formula is I=(W×H³) / 12, wherein W is the width of the pressure plate, and H is the thickness of the pressure plate. For example, if the width W of the pressure plate is 0.3 m and the thickness H of the pressure plate is 0.01 m, then I=(0.3×(0.01)³) / 12=2.5×10-9 m4. The value of the preset downward bending amount f needs to take into account the triggering reliability of the stroke detector and the material performance of the pressure plate: on the one hand, f needs to be not less than the minimum triggering stroke of the stroke detector (for example, when the triggering stroke of the stroke switch is 1×10-3 m, f can be set to 1.2×10-3 m), to ensure that the limit support can be stably triggered when it moves downward; on the other hand, the maximum allowable elastic deflection fmax of the pressure plate needs to be calculated through the material mechanics formula fmax=(σs×L²) / (6×E×H) (wherein σs is the yield strength of the pressure plate material), to ensure that f≤fmax, so as to avoid plastic deformation of the pressure plate. For example, if the pressure plate material is Q235 steel (σs=235×106 Pa, E=2.06×1011 Pa), the effective support span L is 0.5 m, and the thickness H is 0.01 m, then fmax=(235×106×(0.5)2) / (6×2.06×1011×0.01)≈4.7×10-3 m, so the preset downward bending amount f can be selected in the range of 1.2×10-3 m to 4.7×10-3 m. By substituting I, f, E, and L into the deflection-pressure relationship model formula, the theoretical calculation result of the initial pressure value n can be obtained. For example, when E=2.06×1011 Pa, I=2.5×10-9 m4, f=1.2×10-4 m, and L=0.5 m, F=(48×2.06×1011×2.5×10-9×1.2×10-3) / (0.5)³≈237.31 N, which is the theoretical reference value of the initial pressure value n of the pressure plate.

[0026] S1023, input the preset downward bending amount based on the deflection-pressure relationship model, and inversely calculate the corresponding pressure value through the pressure relationship model, to determine the initial pressure value required for the pressure plate 2 to occur the preset downward bending amount.

[0027] The detailed description in step S1023 is that firstly, it is necessary to ensure that the preset bending amount f has passed the rationality verification of S1022 (i.e. f≥minimum triggering stroke of the stroke detector and f≤maximum allowable elastic deflection fmax). Then, the f value after verification, the calculated moment of inertia I, the elastic modulus E of the pressure plate material and the effective support span L are substituted into the deflection and pressure relationship model formula F=(48×E×I×f) / L³ for numerical calculation. For example, the minimum triggering stroke of the pressure plate stroke detector is 1.5×10-3m, fmax=5.0×10-3m is calculated, and f=2.0×10-3m is finally selected; E=2.06×1011Pa, I=3.0×10-9m4, and L=0.6m are known, then substituted into the formula: numerator=48×2.06×1011×3.0×10-9×2.0×10-3=48×2.06×3.0×2.0×10-1=59.328; denominator=0.6³=0.216; therefore F≈59.328 / 0.216≈274.66N, which is the initial pressure value. In order to ensure accuracy, all parameters need to be reviewed: E needs to use the material batch test report value, L needs to be measured by the inside distance of the concave mounting block on site, I needs to be recalculated combined with the actual processing size of the pressure plate, and the error needs to be controlled within ±2%. Finally, the inverse calculated pressure value is determined as the initial pressure value of the pressure plate, which is used as the theoretical benchmark for subsequent field test adjustment.

[0028] S103, performing field loading test on the pressure plate 2, simulating single wheel pressure action when the vehicle is parked, and recording the actual pressure value when the pressure plate 2 bends and triggers the pressure shaft 5 to move and the stroke detector 7 reliably outputs a signal; The detailed description in step S103 is that the test preparation needs to be equipped with a high-precision hydraulic loading system (precision level ±0.5%FS), a laser displacement sensor with a resolution of 0.01mm, a data acquisition instrument with a sampling frequency of 100Hz, and a rubber loading head with a diameter of 300mm (simulating the contact area of the vehicle tire); the test environment needs to ensure that the target parking space ground levelness error is ≤±0.5mm / m, the device components are firmly welded without loosening, and there is no vibration or electromagnetic interference around.

[0029] The test process is divided into the following steps: ① align the rubber loading head to the center area of the pressure plate (corresponding to the typical rolling position of the vehicle tire); ② start the hydraulic system to slowly apply pressure at a rate of 0.5 kN / s, avoiding abnormal structural deformation caused by instantaneous impact; ③ record the hydraulic pressure value, the deflection of the pressure plate measured by the laser displacement sensor, the displacement of the pressure shaft fed back by the linear encoder, and the signal output state of the travel detector in real time; ④ when the travel detector first outputs a high-level signal for more than 1 s, immediately lock the current hydraulic pressure value as the single test trigger pressure Ftest, and record the corresponding deflection ftest, confirming that the deviation of ftest from the preset deflection f is ≤±0.1 mm; ⑤ after each test, unload the pressure and wait for 5 minutes for the device to recover the elastic deformation, and repeat the test 3-5 times to eliminate accidental errors; ⑥ perform the above test on all pressure plates on the device (such as the left, middle, and right three plates) to ensure consistency in triggering at each position.

[0030] Data processing: calculate the arithmetic mean Favg of multiple test Ftest, for example, when the initial pressure value n=274.66 N, the test results of 5 times are 280 N, 278 N, 282 N, 279 N, and 281 N, Favg=(280+278+282+279+281) / 5=280 N; compare the relative deviation of Favg and the initial pressure value n, if the deviation is ≤±5% (such as the deviation ≈1.94% in this example), then Favg is directly determined as the final pressure value nfinal; if the deviation is >±5% (such as Favg=300 N, deviation ≈9.2%), the preset deflection f needs to be reviewed for reasonableness, if f is too small, it can be increased to 2.2×10-3 m and then recalculated, and the field test is carried out again until the deviation meets the requirements; if it is found during the test that the pressure plate has plastic deformation (the deflection does not completely recover after unloading), the preset deflection needs to be reduced to within 80% of the maximum allowable elastic deflection fmax, or the material with higher yield strength (such as Q345 steel) is replaced for retesting.

[0031] Finally, the adjusted final pressure value nfinal is written into the controller parameter library as the trigger threshold for subsequent vehicle parking perception, ensuring that the device can reliably respond to the single wheel pressure of different vehicles in real scenarios.

[0032] S104, compare the initial pressure value with the field test value, and repeatedly adjust the pressure value to the optimal value that meets the material mechanics performance requirements of the pressure plate 2 and ensures that the travel detector can reliably output a signal; In step S104, it needs to be specified that first, calculate the relative deviation Δ of the initial pressure value n and the field test average value Favg, the formula is Δ=(Favg-n) / n×100%. The core adjustment logic needs to consider both theoretical rationality and actual reliability: 1. If Δ ∈ [-5%, 5%], it indicates that the theory and the actual match well, directly determine Favg as the final pressure value nfinal, and record the deviation source (such as small fluctuation of material batch elastic modulus, installation gap ≤0.1 mm, etc.), and store into the device operation file; 2. If Δ > 5% (positive deviation), it indicates that the actual trigger pressure is higher than the theoretical value, which may be caused by the small preset sag f, resulting in the high trigger threshold of the travel detector, or the upward pre-deformation of the pressure plate. First, check the installation state (such as whether the concave mounting block is welded horizontally), and then increase the value of f (such as from 2.0 × 10-3 m to 2.3 × 10-3 m, and ensure that it is still ≤90% of fmax), recalculate the theoretical n value and repeat S103 test until Δ ≤5%; 3. If Δ <-5% (negative deviation), it indicates that the actual trigger pressure is lower than the theoretical value, which may be caused by the large f, resulting in the easy deformation of the pressure plate, or the contact area of the rubber loading head does not match the actual tire (such as the actual tire width is larger). First, replace the matching loading head (such as diameter 350 mm), and if it is invalid, reduce the value of f to 70% of fmax (such as from 2.0 × 10-3 m to 1.8 × 10-3 m), recalculate n and test until the deviation is up to standard.

[0033] The final pressure value nfinal needs to be verified twice: ① In the field test, the output signal of the travel detector is stable for ≥1 s without interruption or false triggering; ② The elastic recovery rate of the pressure plate after unloading is ≥99% (i.e. the residual sag is ≤0.01 mm), avoiding plastic damage. After verification, nfinal, corresponding f value, material parameters and adjustment records are integrated into the “calibration report of pressure value”, which is written into the controller parameter library as the basis for subsequent operation and maintenance.

[0034] S105, repeat the above steps for each pressure plate 2 to complete the individual setting of the pressure value of all pressure plates 2.

[0035] S2, when the actual pressure value is greater than n, the pressure plate 2 sags, the pressure shaft 5 moves downward, and the limiting support 6 moves downward synchronously; In step S2, it needs to be specified that when the vehicle enters the target parking space, the static pressure of the tire on the pressure plate gradually increases with the parking position, and when the single-wheel pressure continuously exceeds the pressure value n (such as 274.66N), the pressure plate produces a preset bending amount based on the elastic properties of the material. When the pressure plate bends, the center of its bottom moves downward synchronously through the pressure shaft 5 (diameter 20mm, material 45# steel). The limit support (L-shaped structure) fixed to the lower end of the pressure shaft moves downward, and the lower edge of the support maintains a preset initial distance (equal to the displacement value corresponding to the preset bending amount) from the trigger contact (travel switch) of the travel detector. At this time, the linear encoder collects the downward displacement of the pressure shaft 5 in real time, and the data acquisition instrument synchronously records the pressure value, displacement and travel detector signal state at a frequency of 100Hz, ensuring that the downward movement process is linear and has no sudden changes. When verifying the scene of multiple wheels rolling at the same time (such as the front and rear wheels of the vehicle rolling on the left and right pressure plates respectively), each pressure shaft 5 moves downward independently without interference.

[0036] S3, when the travel detector 7 detects the signal of the limit support 6 moving downward synchronously, the travel detector 7 sends a vehicle parking signal to the controller; S4, based on the vehicle parking signal, the controller sends a start command to the driver 10 within a set time; S5, based on the start command, the driver 10 controls the turning box 11 to rotate the flap 9 upward.

[0037] It also needs to be explained that the driver 10, the turning box 11 and the flap 9 have been disclosed in a kind of unattended urban roadside parking charging method and system with application number 202511205628X, which will not be repeated here.

[0038] The principle of the high-precision vehicle sensing method for the above-mentioned embodiment 2 is as follows: by integrating material mechanics parameters and structure size to establish a deflection-pressure mathematical model, the initial pressure value of the pressure plate to produce a preset bending amount is calculated inversely, and then the deviation between the theoretical value and the actual trigger pressure is calibrated by field loading test, so as to finally determine the optimal pressure threshold value considering the elastic safety of the pressure plate and the reliable triggering of the travel detector; when the single-wheel pressure of the vehicle exceeds the threshold value, the pressure plate produces a preset elastic bending, and the displacement is transmitted to the limit support through the pressure shaft, so as to trigger the travel detector to output a stable signal; the controller determines that the vehicle has been reliably parked based on the signal, and then sends a command to the driver to control the flap to rotate, so as to realize the accurate triggering of forced parking.

[0039] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A high-precision vehicle sensing device for a forced parking brake, characterized in that, The device includes: T-shaped mounting plate (1) is fixedly installed in the target parking space; The pressure-bearing shaft (5) is movably mounted on the T-shaped mounting plate (1); At least two pressure plates (2), each pressure plate (2) is fixed to the T-shaped mounting plate (1) by two concave mounting blocks (3); At least two pressure plates (4) are disposed on the pressure bearing shaft (5), and their ends are disposed on the pressure bearing plate (2); A limiting bracket (6) is mounted on the pressure-bearing shaft (5); The travel detector (7) is mounted on the T-shaped mounting plate (1) via the mounting bracket (8) and cooperates with the limiting bracket (6); The top guard plate (12) is disposed on the pressure plate (4) and moves synchronously with the pressure plate (4).

2. The high-precision vehicle sensing device for a forced parking brake as described in claim 1, characterized in that, The travel detector (7) is a travel switch.

3. A high-precision vehicle sensing method for a forced parking brake, characterized in that, Applied to the apparatus of any one of claims 1 to 2, the method comprises: Set the pressure value of each bearing plate (2) to n; When the actual pressure value is greater than n, the pressure plate (2) bends downward, the pressure shaft (5) moves downward, and the limiting bracket (6) moves downward simultaneously; When the travel detector (7) detects the signal that the limit bracket (6) moves downward synchronously, the travel detector (7) sends a vehicle stop signal to the controller; The vehicle parking signal controller sends a start command to the driver (10) within a set time. Based on the start command driver (10), the rotating box (11) controls the flap (9) to rotate upward.

4. The high-precision vehicle sensing method for a forced parking brake as described in claim 3, characterized in that, The pressure value for each bearing plate (2) is set as follows: Determine the vehicle type suitable for the target parking space and obtain the minimum static pressure value of a single wheel for that type of vehicle; Based on the material mechanical parameters and structural dimensions of the bearing plate (2) and the minimum static pressure value of the single wheel, the pressure threshold required for the bearing plate (2) to undergo a preset downward bending amount is calculated by the mechanical model as the initial pressure value; The pressure plate (2) was subjected to an on-site loading test to simulate the single wheel pressure when the vehicle was parked. The actual pressure value was recorded when the pressure plate (2) bent down to trigger the pressure shaft (5) to move and make the stroke detector (7) reliably output a signal. Compare the initial pressure value with the actual test value, and repeatedly adjust the pressure value to the optimal value that meets the mechanical performance requirements of the bearing plate (2) material and ensures the reliable output signal of the stroke detector; Repeat the above steps for each bearing plate (2) to complete the personalized setting of the pressure value of all bearing plates (2).

5. The high-precision vehicle sensing method for a forced parking brake as described in claim 4, characterized in that, Based on the material mechanical parameters and structural dimensions of the bearing plate (2) and the minimum static pressure value of the single wheel, the pressure threshold required for the bearing plate (2) to undergo a preset downward bending amount is calculated through a mechanical model as the initial pressure value, including: Obtain the material mechanical parameters and structural dimensional parameters of the bearing plate (2); A model relating deflection and pressure is established based on the aforementioned material mechanical parameters and structural dimensional parameters. Based on the relationship model between deflection and pressure, a preset downward bending amount is input, and the corresponding pressure value is obtained by back-calculation through the relationship model of pressure. This pressure value is determined as the initial pressure value required for the bearing plate (2) to undergo the preset downward bending amount.

6. The high-precision vehicle sensing method for a forced parking brake as described in claim 5, characterized in that, The mathematical expression of the relationship model between deflection and pressure is: F=(48×E×I×f) / L³, where: F is the actual pressure value of the bearing plate (2), E is the elastic modulus of the material of the bearing plate (2), I is the moment of inertia of the cross section of the bearing plate (2), f is the preset downward bending amount (deflection) of the bearing plate (2), and L is the effective support span of the bearing plate (2) (i.e., the distance between the two concave mounting blocks).

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