Active headrest device based on acceleration trolley
Through the active headrest device based on the acceleration trolley, the emergency braking and rear-end collision situations are simulated and their movement time and distance are tested, the problem of unclear protection in the existing technology is solved, and more effective occupant protection is achieved.
Patent Information
- Application Number
- CN202421726823.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-19
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-19
AI Technical Summary
The existing active headrests protect the head and neck of the occupant during emergency braking or rear-end collision are unclear, and relevant experimental studies are lacking to determine the time and distance of movement to begin.
The active headrest device based on the acceleration trolley is used to simulate waveform signals and record and test the movement time and distance of the active headrest to evaluate its protective effect on the head and neck of the dummy.
Through multiple tests, the optimal movement time and distance of active headrests can be determined, helping enterprises develop more effective active headrests to provide better occupant protection.
Smart Images
Figure CN222784340U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of seat headrests, in particular to an active headrest device based on an acceleration trolley. Background Art
[0002] Active safety of automobiles plays a vital role in automobile safety. Among them, the automatic emergency braking system (AEB) is widely adopted by many manufacturers. When a possible collision is detected, it will automatically brake, effectively reduce the risk of collision, and provide protection for the safety of passengers. However, in the case of emergency braking, although the life safety of passengers is protected, the emergency braking action itself will cause certain damage to the body of passengers, especially the neck. In view of this, a series of active headrests have emerged in the market. During the emergency braking process, the active headrest can actively move forward to shorten the distance between the active headrest and the passenger's head, thereby protecting the passenger's head and neck from injury. At the same time, when the car is rear-ended, the active headrest can also reduce the damage to the passenger's head and neck.
[0003] However, the degree of protection that existing active headrests provide to occupants is still unclear. For example, in the event of emergency braking or a rear-end collision, there has been no relevant experimental research on when the active headrest should start to move forward and how far it should move forward. Utility Model Content
[0004] The utility model aims to provide an active headrest device based on an accelerating trolley to determine the time when the active headrest starts to move and the moving distance.
[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an active headrest device based on an acceleration trolley, comprising a trolley, a seat detachably connected to the trolley, a dummy placed on the seat, a driving unit provided on the top of the seat, an active headrest detachably connected to the driving unit, and the driving unit can drive the active headrest to move.
[0006] The beneficial effects of this solution are as follows: during the test, the trolley is started, the waveform signal to be loaded is simulated by the trolley, and the time when the waveform signal starts to be loaded is recorded; after the waveform signal has been loaded for a period of time, the active headrest is driven by the drive unit to move to the side close to the dummy, shortening the distance between the dummy and the active headrest, and the time and distance when the drive unit starts to drive the active headrest to move are recorded; by examining the degree of protection of the active headrest against injuries to the dummy's head and neck, it is determined whether the time when the active headrest starts to move and the distance when the active headrest starts to move meet the requirements; through multiple tests, the time when the active headrest starts to move and the distance when the active headrest starts to move are determined, which helps companies better develop active headrests and thus provide better protection for occupants.
[0007] This technical solution can be used to test seats of different models and is universal.
[0008] Since the active headrest is detachably connected to the drive unit, the active headrest can be easily replaced.
[0009] Furthermore, the driving unit includes a mounting bracket, which is fixedly connected to the seat frame, a driving member is installed above the mounting bracket, the active headrest is detachably connected to the output shaft of the driving member, and the driving member can drive the active headrest to move.
[0010] The beneficial effects of this solution are as follows: when the waveform signal that needs to be loaded is simulated by the trolley, after the waveform signal has been loaded for a period of time, the active headrest can be driven by the driving component to move toward the side close to the dummy, thereby shortening the distance between the dummy and the active headrest and providing protection for the dummy. At the same time, the time when the active headrest starts to move and whether the moving distance is reasonable can be judged based on the degree of protection against injuries to the dummy's head and neck.
[0011] Furthermore, the moving distance of the active headrest is 100-120mm.
[0012] The beneficial effect of this solution is that this technical solution can minimize the damage to the dummy's head and neck by setting the moving distance of the active headrest to 100-120 mm.
[0013] Furthermore, the moving speed of the active headrest is 0.2-0.24 m / s.
[0014] The beneficial effect of this solution is as follows: this technical solution can prevent the dummy's head from contacting the active headrest by controlling the moving speed of the active headrest to 0.2-0.24 m / s, and can also enable the active headrest to protect the dummy's head and neck, thereby minimizing the degree of damage to the dummy's head and neck.
[0015] Furthermore, the time when the active headrest starts to move is 200-400ms after the trolley is loaded with the waveform signal.
[0016] The beneficial effect of this solution is: this technical solution starts to drive the active headrest 200-400ms after the trolley is loaded with the waveform signal, which can keep the dummy's head at an appropriate distance from the active headrest and minimize the damage to the dummy's head and neck.
[0017] Furthermore, it also includes a power supply circuit and a control circuit. The power supply circuit is used to supply power to the control circuit. An air switch is installed on the power supply circuit. The control circuit includes a controller, a time relay and a solid-state relay. The time relay is used to record the time when the active headrest starts to start. The trolley system, the drive component, the time relay and the solid-state relay are all electrically connected to the controller.
[0018] The beneficial effects of this scheme are as follows: during the test, first close the air switch of the power supply circuit, and then click the start button on the trolley. The trolley system feeds back the start signal to the controller, and the controller controls the closure of the contacts of the trolley system output signal (that is, the required waveform curve is loaded on the trolley). The 2nd and 7th pins of the time relay coil are energized, and the timing starts. After 200-400ms, the 6th and 8th pins of the time relay coil are closed, and the solid-state relay coil and the solenoid valve coil are energized. The solenoid valve coil is energized so that the driver drives the active headrest to move to the side close to the dummy, and the solid-state relay coil is energized so that the output end of the solid-state relay is closed to keep the control circuit continuously powered, so that the active headrest remains in the extended state to provide protection for the dummy. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a three-dimensional diagram of an active headrest device based on an acceleration trolley in Example 1 of the utility model;
[0020] Figure 2 This is a schematic diagram of the structure of the power supply circuit in Embodiment 2 of the present utility model;
[0021] Figure 3 This is a schematic diagram of the structure of the control loop in Example 2 of the utility model. DETAILED DESCRIPTION
[0022] The following is further described in detail through specific implementation methods:
[0023] The figure marks in the drawings of the specification include: trolley 1, seat 2, mounting bracket 3, drive part 4, active headrest 5, nut 6, air switch 7, trolley system output signal 8, pins 2 and 7 of the time relay coil 9, pins 6 and 8 of the time relay coil 10, solid-state relay coil 11, solenoid valve coil 12, and solid-state relay output terminal 13.
[0024] Example 1
[0025] like Figure 1An active headrest device based on an accelerating trolley is shown, comprising a trolley 1, a seat 2 is bolted on the top of the trolley 1, a dummy is placed on the seat 2, a driving unit is provided on the top of the seat 2, the driving unit comprises a mounting bracket 3, the mounting bracket 3 is welded to the right side of the frame of the seat 2, a driving member 4 is bolted on the upper side of the mounting bracket 3, an active headrest 5 is bolted on the output shaft of the driving member 4, and the driving member 4 can drive the active headrest 5 to move. The driving member 4 adopts an adjustable stroke cylinder, and the stroke of the cylinder can be adjusted by the nut 6 on the cylinder, so as to determine the moving distance of the active headrest 5; the moving distance of the active headrest is 100-120mm; the moving speed of the active headrest is 0.2-0.24m / s, and the time when the active headrest starts to move is 200-400ms after the trolley is loaded with the waveform signal.
[0026] In this embodiment, a simulation test is performed on the active headrest 5 above the car seat 2. The moving speed of the active headrest 5 is 0.2 m / s. The time when the active headrest 5 starts to move is 200 ms after the waveform signal is loaded. The moving distances of the active headrest 5 are respectively no movement, 50 mm forward, 70 mm forward, 100 mm forward, and 120 mm forward. The degree of protection of the dummy from injury after collision is tested respectively. The test results are shown in Table 1. It should be noted that the ordinary headrest in this embodiment is a case where the active headrest 5 does not move.
[0027] Table 1
[0028]
[0029]
[0030] It can be seen from Table 1 that the more the active headrest 5 moves forward, the shear force and tensile force of the upper and lower neck of the dummy, as well as the NIC are significantly reduced; the more the active headrest 5 moves forward, the acceleration of the dummy's head increases first and then decreases, and the overall trend is a reduction in the dummy's head injury; the more the active headrest 5 moves forward, the bending moment of the upper and lower neck of the dummy and the TI injury increase.
[0031] Taking into account the limitation of the internal structure of the active headrest 5 and the manufacturing cost, it is most appropriate to set the moving distance of the active headrest 5 to 100 mm.
[0032] The specific implementation process is as follows:
[0033] During the test, the trolley 1 is started, and the waveform signal to be loaded is simulated by the trolley 1 (the loaded waveform signal is any one of the acceleration curve of emergency braking and the acceleration curve of rear-end collision. In the present embodiment, the acceleration curve of emergency braking is loaded), and the time when the waveform signal starts to be loaded is recorded. 200ms after the waveform signal is loaded, the active headrest 5 is driven by the driving member 4 to move toward the side close to the dummy, so as to shorten the distance between the dummy and the active headrest 5, and the time and the distance when the driving member 4 starts to drive the active headrest 5 to move are recorded. By examining the degree of protection of the active headrest 5 against the head and neck injuries of the dummy, it is judged whether the time and the distance when the active headrest 5 starts to move meet the requirements. Through multiple tests, the time and the distance when the active headrest 5 starts to move are determined, so as to help enterprises better develop the active headrest 5 and provide better protection for the occupants.
[0034] Example 2
[0035] On the basis of Example 1, Figure 2-3 As shown, it also includes a power supply circuit and a control circuit. The power supply circuit is used to supply power to the control circuit. An air switch 7 is installed on the power supply circuit. The control circuit includes a controller, a time relay and a solid-state relay. The time relay is used to record the time when the active headrest 5 starts to start. The trolley system, the drive component 4, the time relay and the solid-state relay are all electrically connected to the controller.
[0036] During the test, first close the air switch 7 of the power circuit, and then click the start button on the trolley 1. The trolley system feeds back the start signal to the controller, and the controller controls the closure of the contacts of the output signal 8 of the trolley system (that is, the acceleration curve of the emergency brake is loaded on the trolley). The 2nd and 7th pins 9 of the time relay coil are energized, and the timing starts. After 200ms, the 6th and 8th pins 10 of the time relay coil are closed, and the solid-state relay coil 11 and the solenoid valve coil 12 are energized. The solenoid valve coil 12 is energized so that the drive component 4 drives the active headrest 5 to move to the side close to the dummy, and the solid-state relay coil 11 is energized so that the solid-state relay output terminal 13 is closed, and the control circuit is continuously powered, so that the active headrest 5 remains in the extended state to provide protection for the dummy.
[0037] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. An active headrest device based on an acceleration trolley, characterized in that: The utility model comprises a trolley, a seat is detachably connected to the trolley, a dummy is placed on the seat, a driving unit is arranged on the top of the seat, an active headrest is detachably connected to the driving unit, and the driving unit can drive the active headrest to move.
2. The active headrest device based on the acceleration trolley according to claim 1, characterized in that: The driving unit includes a mounting bracket, which is fixedly connected to the seat frame. A driving component is installed above the mounting bracket. The active headrest is detachably connected to the output shaft of the driving component, and the driving component can drive the active headrest to move.
3. The active headrest device based on the acceleration trolley according to claim 2, characterized in that: The active headrest has a movement distance of 100-120mm.
4. The active headrest device based on the acceleration trolley according to claim 3, characterized in that: The moving speed of the active headrest is 0.2-0.24m / s.
5. The active headrest device based on the acceleration trolley according to claim 4, characterized in that: The active headrest starts to move 200-400ms after the trolley is loaded with the waveform signal.
6. The active headrest device based on the acceleration trolley according to claim 5, characterized in that: It also includes a power supply circuit and a control circuit. The power supply circuit is used to supply power to the control circuit. An air switch is installed on the power supply circuit. The control circuit includes a controller, a time relay and a solid-state relay. The time relay is used to record the time when the active headrest starts to start. The trolley system, drive components, time relays and solid-state relays are all electrically connected to the controller.