JP3086295U - Variable volume charge simulation device for safety airbag test - Google Patents

Abstract

(57) [Summary] [Problem] To provide a variable capacity charge simulation device for a safety airbag test. A gas storage unit having a hollow interior for storing gas and having a gas supply switch at an outlet, an opening connected to the gas supply switch, an opening, and a firing device provided at the opening. A variable-capacity gas supply tank that provides different capacity volumes; a nozzle positioned at the front end of the variable-capacity gas supply tank, for delivering gas in the variable-capacity gas supply tank; and a nozzle provided at an opening of the nozzle. , A membrane piece module including a blast membrane piece, and a charging module having a hollow shape and connected to the membrane piece module.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention is a kind of test device, and particularly relates to a variable-volume simulating device for a safety airbag test.

[0002]

[Prior art]

 In general, the primary purpose of the design of a safety airbag is to protect the head, neck and chest of front seat occupants and to prevent occupants from being injured in the event of a collision. This system is composed of three basic components. That is, (1) a crash sensor, (2) a detection device (Diagnostic Package), and (3) an airbag module (Airbag Assemblies). An application of the safety airbag is required to satisfy a specific or appropriate airbag pressure waveform (Bag Pressure waveform), that is, a pt curve distribution diagram. Generally, the operating pressure in the airbag is about 300-800 mbar, however, in the actual situation of a car accident, the vehicle occupant collides with the buffer airbag, and the pressure in the airbag increases by 50%, and the pressure increase increases. Excessive, the occupant's neck rebounds, creating personal injury and death. Therefore, it is important for the airbag design to select an airbag cloth with an appropriate air permeability or an airbag with an appropriate vent hole area, which makes the airbag more flexible and has an optimal cushioning effect. Can be achieved. However, if it was too soft, the occupants collided with the steering wheel, resulting in injuries and death, and on the contrary the effectiveness of occupant protection was lost.

[0003] After the above-mentioned parts are assembled, it is necessary to satisfy a pressure-time (pt) curve distribution diagram inside a specific or appropriate safety airbag. As shown in FIG. (1st peak pressure value) is the maximum pressure before the gas ruptures the cover plate, and point B is the negative pressure phenomenon in the safety airbag formed at the moment when the gas ruptures the cover plate, and point C ( The second peak pressure value is a phenomenon in which the safety airbag is gradually filled with air to maintain the pressure state, and then gradually leaks pressure. Of particular note is that the magnitude and time shift of the peak pressure at point C affects the stiffness of the airbag and the cushioning effect of the best timing of occupant protection. For this reason, in order for the airbag to achieve the pressure waveform of the standard airbag, at least an airbag module composed of the components of the airbag, the airbag, and the cover plate is required. It is necessary to verify whether each part complies with the functional requirements by static deployment tests of high, low, room temperature and cycle tests.

[0004] Factors that affect the pressure-time (pt) curve distribution diagram include a cover plate material, a cover plate shape design, a safety airbag material, a folding system, a bag diameter, a suspender length in the bag, and exhaust. Includes total hole area, bag permeability, total charge mass, gas mass flow rate, gas temperature, and charge filter net, which are important variables that need to be considered in safety airbag design. In particular, the magnitude of the point C (second peak pressure value) in the pressure-time (pt) curve distribution diagram affects the hardness of the safety airbag after inflation and the effect of protecting the human body, A second peak value that was too high resulted in the explosion of the safety airbag, resulting in loss of occupant protection and even burns from leakage of hot air. Therefore, the pressure limit that the safety airbag can withstand is evaluated by the research and development organization, and the design variables are modified, the basis for sewing the combination of the airbag cloth and the sewing line, and the reference for all system components.

FIG. 1 shows a known charge test apparatus 10. Before the test, first, the gas supply switch 15 of the nitrogen gas cylinder 14 is opened, and the electromagnetic valve 16 measures the pressure from the accumulator 12 to the required test pressure. At the time of the test, a person opens the solenoid valve 16 to release the pressure and supply gas, and the gas is caused to flow through the pipeline to impact a blast membrane piece (not shown) sandwiched between the pressure accumulation tank 12 and the nozzle 13. Then, the airbag module 17 is filled with air and quickly closed. However, the artificial pressure release method causes inaccuracies in the test data due to the unevenness of the gas in the accumulator 12. In addition, it is necessary to always accumulate pressure in advance in order to reduce the crash delay time when testing high and low temperature modules. Unexpected blasting may occur due to a high temperature accumulating state during assembly of the known airbag module 11, or damage to the parts themselves or incorrect selection of membrane pieces, which may cause danger. . In addition, nitrogen gas injection at room temperature cannot simulate the true situation at the time of blasting. In addition, the gases could not be reused and the costs were relatively high, none of which was ideal.

[0006]

[Problems to be solved by the invention]

 The main purpose of the present invention is to provide a variable volume charge simulation device for safety airbag testing, which is based on the variable volume gas storage tank or the charging characteristics of the marketed charge device with the starting pressure. Is a device that can simulate

A further object of the present invention is to provide a variable-volume charging simulating apparatus for testing a safety airbag, which uses a general gas to provide different charging targets (charging tank, airbag). Alternatively, it is assumed that the device can perform an airbag module) test and save the test cost.

Another object of the present invention is to provide a variable-volume charging simulator for a safety airbag test, fix the charging conditions, target the charging tank, and achieve the desired airbag pressure waveform. The airbag design can be designed to determine the required air volume and the total leakage flow area, and the airbag test must be performed again to improve the airbag design and conform to the standard airbag pressure waveform. Is to do.

Another object of the present invention is to provide a variable-volume charging simulating device for safety airbag testing, to fix the airbag size and adjust the charging conditions, thereby conversely achieving the standard air to be achieved. The purpose is to acquire the charging characteristic curve of the bag pressure waveform and use it as the basis for the development of the aerator, and to use it for research and development of gentle bags.

[0010]

[Means for Solving the Problems]

 The invention according to claim 1 is a gas storage unit in a variable-volume filling simulation device for a safety airbag test, wherein the inside is hollow, used for gas storage, and a gas supply switch is provided at an outlet thereof. A variable-capacity gas supply tank connected to the gas supply switch, having an opening, provided with a firing device in the opening, and capable of providing different volume volumes; and a front end of the variable-capacity gas supply tank. A nozzle for supplying gas in the variable-volume gas supply tank, a membrane piece module provided at an opening of the nozzle and having a blast membrane piece, and a hollow interior. , A charging module connected to the membrane piece module, and a variable volume charging simulator for a safety airbag test. The invention of claim 2 is characterized in that the variable capacity gas supply tank comprises a gas storage cylinder and a piston device to provide different gas storage volumes, for a safety airbag test according to claim 1. It is a variable capacity charge simulation device. The invention of claim 3 is characterized in that the variable-volume gas supply tank controls the position of the piston device using a hydraulic system, and the variable-volume charge for testing a safety airbag according to claim 2. It is a simulation device.

[0011]

[Embodiment of the invention]

 The present invention includes a variable capacity gas supply tank, a nozzle, a gas storage unit, a membrane piece module, and a charging module. In the variable capacity gas supply tank, the volume of the gas storage tank is modified by the hydraulic positioning method, and the required gas storage volume is calculated using the position sensor. And providing a different starting pressure to the gas storage unit by the high pressure gas of the gas storage unit. Before use, first set the required charging volume and gas pressure, and select the charging target (filling tank, air bag or air bag module) to be assembled with an appropriate nozzle. Finally, when the firing device is activated, a simulated charging test can be performed, and a pt curve diagram of the gas storage tank and the charging target can be obtained by measurement.

[0012]

【Example】

 Please refer to FIG. FIG. 2 is a schematic view of a variable-volume charging simulator for a safety airbag test according to the present invention. This embodiment includes a variable capacity gas supply tank 30, a gas storage unit 20, a membrane piece module 40, and a charging module 50.

The inside of the gas storage unit 20 has a hollow shape, is provided for gas storage, and a gas supply switch 21 is provided at an outlet portion thereof. As shown in the figure, a variable-capacity gas supply tank 30 is connected to the gas supply switch 21, has a hollow inside, has an opening 32 at the upper end, a firing device 34 is provided at the opening 32, and a side wall has A tank pressure gauge 38 is provided to measure the maximum instantaneous tank pressure Pr inside the variable capacity gas supply tank 30. The variable capacity gas supply tank 30 includes a gas storage cylinder 35 and a piston device 36 to provide different gas storage volumes. The variable capacity gas supply tank 30 controls the position of the piston device 36 using a hydraulic system (not shown). In addition, the variable capacity gas supply tank 30 is provided with a position sensor 37, which calculates the current gas storage volume inside the gas storage cylinder 35. According to the present embodiment, air or other gas having the same effect is used, instead of the well-known nitrogen gas.

The membrane piece device 40 includes a blast membrane piece 41, is suppressed by an O-ring 42 and a nozzle connecting head 43, and is fixed to the opening 32 of the variable capacity gas supply tank 30 by a plurality of bolts 44 and nuts 45. Have been. The charging module 50 includes a safety airbag 51 and is connected to the nozzle 43. The diameter of the nozzle 43 is adjusted according to different simulation conditions. A bag pressure gauge is separately assembled to the safety airbag 51 to measure the bag pressure Pb inside the safety airbag 51.

In a closed container, the relational expression between ideal gas pressure P, volume V and temperature T is: PV = NRT. General actual gases (eg, CO ₂ , N ₂ ) need to be modified by adding the Van der Waal variables a, B in the relational expression. However, this part is not the focus of the present invention and will not be described. Thus, before use, the predetermined explosion high temperature (85 ° C.), low temperature (−35 ° C.), or normal temperature (25 ° C.) can be simulated by controlling the position sensor 37 and the output pressure thereof. First, the gas pressure of the gas inside the entire variable capacity gas supply tank 30 and the required charged volume are set, and different blast temperatures are simulated. Subsequently, the gas supply switch 21 is opened, gas of a predetermined pressure is made to enter the variable capacity gas supply tank 30 from the gas storage unit 20, and the gas supply switch 21 is closed. At the time of the test, the charging module 50, which has already reached the equilibrium temperature, is assembled to the membrane piece module 40, and by the instantaneous firing of the firing device 34, the blasting membrane piece 41 is blasted with high-pressure gas to reach the nozzle 43, and the safety air bag is provided. Rapid charging for 51 is performed. A general ball valve can be used for the firing device 34, but the description is omitted because it is not the focus of the present invention.

Please refer to FIG. FIG. 3 shows a second embodiment of the variable-volume charging simulator for testing safety airbags according to the present invention. The air filling module of the present invention can be a closed air tank (or an air tank with a variable opening exhaust port) of different volume, an airbag or an airbag module. As shown in FIG. 3, the charging module according to another embodiment of the present invention has a folded safety airbag placed in a lid plate.

The variable-volume charging simulator for safety airbag testing according to the present invention is required to test or simulate the impact pressure after the airbag is fully deployed by using the volume of the gas supply tank and the gas pressure control. Simulated temperature conditions can be implemented. The simulated pressure data obtained by testing the variable volume charge simulator for the safety airbag test of the present invention is the same or more detailed than the valid data obtained by the airbag module inflator and airbag conversion. However, the gas used in the simulation test of the simulation method and apparatus of the present invention does not need to be pressurized or heated first, and the simulation process can be effectively simplified. Furthermore, in this embodiment, the cost is relatively low because ordinary air is used as the test gas, and the gas used can be used repeatedly. The ability to adjust the simulation conditions for different situations without having to replenish the gas used in the test and save considerable material costs and material waste, and the benefits are clear.

[0018]

[Effect of the invention]

 Taken together, the present invention is a variable capacity charge simulation device for safety airbag testing that differs in its purpose, means and function from known techniques. In addition, any modification or alteration of details that can be made based on the present invention shall fall within the scope of the claims of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic view of a well-known charging test apparatus.

FIG. 2 is a schematic view of a variable-volume charging simulator for a safety airbag test according to the present invention.

FIG. 3 is a schematic view of another embodiment of the variable air charge simulation device for testing a safety airbag according to the present invention.

[Explanation of symbols]

Reference Signs List 10 Filling simulation device 11 Air bag module 12 Pressure storage tank 13 Nozzle 14 Nitrogen gas cylinder 15 Gas supply switch 16 Solenoid valve 20 Gas storage unit 21 Gas supply switch 30 Variable capacity gas supply tank 32 Opening 34 Shooting device 35 Gas storage cylinder 36 Piston Apparatus 37 Position sensor 38 Tank pressure gauge 40 Membrane module 41 Exploding membrane piece 42 O-ring 43 Nozzle 44 Bolt 45 Nut 50 Charging module 51 Safety airbag

Claims (3)

[Utility model registration claims] A gas storage unit having a hollow interior, used for gas preservation, and provided with a gas supply switch at an outlet thereof, comprising: a gas preservation unit; A variable-capacity gas supply tank, connected to the switch, having an opening, wherein the opening is provided with a firing device and capable of providing different volume volumes; A nozzle for supplying gas in the variable capacity gas supply tank; a membrane piece module provided at an opening of the nozzle and provided with a blast membrane piece; and a membrane piece module having a hollow interior. Pneumatic module and a variable capacity pneumatic simulator for safety airbag testing. 2. The variable capacity charging system according to claim 1, wherein the variable capacity gas supply tank includes a gas storage cylinder and a piston device to provide different gas storage volumes. Ki simulation device. 3. The variable-capacity simulating device according to claim 2, wherein the variable-capacity gas supply tank controls a position of a piston device using a hydraulic system.