TW490409B - Impact analysis device - Google Patents

Abstract

This invention provides an impact analysis device for determining the severity of a vehicle impact. The impact severity analysis device includes an accelerometer installed on a vehicle for detecting the accelerated speed of the vehicle and generating an acceleration signal; and an impact severity analysis circuit installed on the vehicle and electrically connected to the accelerometer. The circuit is capable of determining the impact severity of the vehicle based on the acceleration signal generated by the accelerometer, and generates a analysis signal from its output end. When the acceleration signal of acceleration speed in an impact exceeds a pre-determined activation value, the impact severity analysis circuit will determine whether the impact should be categorized as a severe impact based on the displacement generated by the acceleration signal during a pre-determined period of time. If the impact is determined to be a non-severe one, the impact severity analysis circuit will continues to determine the impact severity of the vehicle by means of the displacement generated by the acceleration signal, the accumulated times that of the jerk values of the acceleration signal exceeds a threshold value, and the time duration from the acceleration values exceeds the activation value to first time the that jerk value of the acceleration signal exceeds the threshold value, until a analysis signal is finally generated.

Description

V. Description of the invention (1) The present invention refers to a slamming and slamming judgment device, especially a judging device for judging a vehicle. Airbag (whether the air hit should exceed the calculation of a certain amount of change. When there is a judgment, it is judged that the air is sent and controlled according to the vehicle's front airbag is (deceleration) energy or windows), etc., although a good judgment can be made Yuan is used as a strike method 0 bag) is one of the standard equipment of the vehicle «/.# ^ 5 is the standard for determining the firing of airbags. The algorithm used in the conventional discussion includes a method based on the accelerometer's G-integration threshold (Threshold) to determine the firing method based on the rate, a sliding window (s 1 iding method, and a rate of change based on the G value). The methods and algorithms of each method have their own advantages, but they also have their own shortcomings. It is still difficult to finish here. If a set of algorithms can be proposed and developed into a device of slam severity, it can provide a reference basis for electronically controlling a single airbag inflation. Will be the master of better performance: = =-a way to judge the impact of the sequence when the block flow side can control the power of the road device to determine the criticality of the severe impact of the crash instructions The single version of the map is a formula of one or two maps, maps, maps, maps, blocks, roads, flow meters, and roads, which are set by the flow meter ιρητ ipnr. Figures for three or four

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Page 5 490409 V. Description of the invention (2) Figure 5 is a schematic diagram of the first displacement input assignment function of the impact severity determination circuit shown in Figure 3. Figure 6 is the second displacement input assignment of the impact severity determination circuit shown in Figure 3. Schematic diagram of the function Figure 7 is a schematic diagram of the time interval input attribution function of the impact severity determination circuit shown in Figure 3 'Figure 8 is a schematic diagram of the cumulative number of input impact functions of the impact severity determination circuit shown in Figure 3 Figure 9 is shown in Figure 3 Schematic diagrams showing the severity output attribution function of the impact severity judgment circuit. Figures 10 to 13 are the impact severity judgment circuits shown in Figure 3, which are 4 30 mph, r ughr 〇ad, 17 mph, 8 mph, etc. Schematic diagram of the test results of the test data. Table 1 is the fuzzy rule of the impact severity judgment circuit shown in Figure 3. Table 2 is the correspondence table of the language variables and words of the impact severity judgment circuit shown in Figure 3. The test results of the akf 1 test data of the impact severity judgment circuit shown in Table 3 are shown in Table 4. According to the test result table reference symbols of the drawings illustrate the severity of the collision determining apparatus 10,: 12 * 14 vehicle accelerometer 15 analog / digital converter

Page 6 490409 V. Description of the invention (3) 16 18 22 26 28 30 32 Q λ 5) Impact severity judgment circuit Air bag device memory ζ First displacement input assignment function module Second displacement input detailed function module Time interval input attribution function module Cumulative number of inputs attribution function module, attribution function module 17 20 24 output electronic control unit fuzzy control unit at the output end 浐 Refer to FIG. 1 ′ FIG. 1 is a device for judging the severity of a vehicle impact according to the present invention Q No block diagram. The present invention provides a vehicle collision severity judgment ί〇 ί ο, b is used to determine the severity of a previous collision of a vehicle 12 (Severi ty). The vehicle mounting strike severity judgment device 10 includes an accelerometer 14 located on the 7-line portion of the vehicle 12 to sense the reverse acceleration of the vehicle 12 in the driving direction and generate an acceleration signal. An analogy / A digital converter 15 is provided on the vehicle 12-and is electrically connected to the accelerometer 14 for converting the acceleration signal into a digital acceleration signal G. The integrity judgment circuit 16 is set on the vehicle} $ It is electrically connected to the analog / digital converter 15 for determining the severity of the collision of the vehicle 12 according to the digital acceleration signal G and generating a judgment number S at its output terminal 7. In addition, vehicle 1 2 is provided with a vacant #i 賫 _ 81 8 ,,, / u

:: ίΓ: (Γ) 20 is electrically connected to the air ϊΐ8 to severely break the device 10 'to control the strike # of the airbag device 18, and = 0 is to judge S and the occupant generated by the device u based on the severity of the collision Dynamics and related letters " Control ";

The second reading of Minger's second figure 'Figure 2 is the timing diagram of the control flow i 6 = control flow shown in Figure 1. According to the impact severity determination device 10 of the present invention, the impact severity determination circuit 16 adopts the "two-stage fuzzy control algorithm" set. 'The first stage (tQ ~,) is when the digital acceleration signal G is When the acceleration value in the impact exceeds a predetermined activation value, the impact severity judgment power will start to determine whether the impact is a "severe impact" based on the amount of displacement learned by the digital acceleration signal G in a preset period ti. ; If it cannot be judged as "severe collision" within the time period, enter the second stage (h ~). The amount of time that the digital acceleration signal G differentiates with respect to time is called, "Jerk" ". After the digital acceleration signal g exceeds the start value, its product value will accumulate once as long as it exceeds the critical value. The cumulative value is called the "accumulated number". The time difference between the digital acceleration signal (; and the first product's threshold value after reaching the threshold value after exceeding the start value, is called, the time interval ". Impact severity judgment circuit 1 6 will continue to be based on the total displacement generated by the digital acceleration signal g after exceeding the starting value, the cumulative number of times the product of the digital acceleration signal G exceeds a critical value, and the product of the digital acceleration signal G after exceeding the starting value The time interval when the critical value is reached to determine the impact severity of the vehicle i 2 'until the determination signal S is generated and output. The impact severity of the second stage includes "severe impact," "moderate impact," and "mild." Impact ", etc. Please refer to Figure 2 'and Figure 3 for the impact severity judgment circuit shown in Figure 1! 6

Page 8 490409 V. Function block diagram of invention description (5) 15. The impact severity judgment circuit 6 includes a memory 22 for storing a plurality of fuzzy rules, and a fuzzy control unit 24 is electrically connected to the analog / digital converter ..., Based on the complex and fuzzy rules, the digital acceleration signal G is converted into an impact severity judgment signal s. The fuzzy control unit 24 processes the digital acceleration signal G generated by the analog / digital converter 15 and generates a first displacement fuzzy input variable d1Spl, a second displacement fuzzy input variable 仏 ", a time interval fuzzy input variable tw, and a Cumulative number of fuzzy input variables njyk, where the first displacement fuzzy input variable displR refers to the digital acceleration #, which is the amount of displacement generated within a preset period u after exceeding the activation value, and the displacement is determined by the digital acceleration signal G versus time Generated by double integration, the second displacement fuzzy input variable disp2 represents the total displacement amount generated after the digital addition exceeds the starting value, the cumulative number of fuzzy inputs ^ input ㉟ change G = ^ table ϋ addition / degree signal ° since exceeding the starting value When the product value exceeds the threshold G, the product value reaches the critical value for the first time after exceeding the starting value: when the force ρ ί f 'f hits each of the fuzzy rules of the severity judgment circuit 16 using the == meaning first displacement The fuzzy input variable displ, the second displacement fuzzy y input variable disp2, the time interval fuzzy input variable tw, and the cumulative number of modulo input variables njerk correspond to a severity fuzzy output variable From: the number of fuzzy rules fyIF_then relationship), · ^ rain fuzzy control unit of the first fuzzy input variable displacement displ, the second displacement

Page 9 V. Description of the invention (6) Product, input variable diSp2, time interval fuzzy input variable "converted by -number of fuzzy input variables njerk to one will loose svty. Feng Severity fuzzy output variables please refer to Figure III, Impact severity judging circuit 丨 6 Eight displacement inputs are assigned to the function module 26, one dagger 3 has the first 28, and the time interval is input to the function module modulo: 30, input: == module belongs to group 32, and a severity output Attribution function 2 = input two return f shift input detailed function module 26 stored in memory 22, and use the first shift to input the attribution function "㈠ 丨 based on one, ㈣ is converted into a first displacement fuzzy P1 second second_ Bit, the modulo attribution function module 28 is stored in the memory 22, and the first-shift displacement is returned to the second displacement input variable = the first displacement fuzzy value fdlsp2. Feng Feng is stored in the memory 22, and is used to convert the time interval fuzzy input variable tw into a time according to the moment "::: = 30." The module M is stored in the memory 22, and is used to input the attribution function e according to a cumulative number (njer fuzzy input variable fnjeirk is converted into a cumulative number modulo 2 J e 7 multiple output attribution function module 34 is stored in the memory 22 In jerk, the severity modulus generated by the severity output attribution function (svty) == converted to the severity output value after deblurring according to m (that is, the output variable svty), where the severity fuzzy value fsvty is composed of the first displacement blur value fdispi, the second displacement blur value fdisp2, and the interval blur value is 409.

ftw and the minimum value of the cumulative number of fuzzy values fnjerk correspond to the severity of the loss function / (svty) and are generated by combination. Finally, the fuzzy control unit tg24 will convert the severity fuzzy value fsvty into a representative vehicle severe impact signal s (ie the value of the output variable svty) and output it at the output 17. When breaking through 10 strikes, first, the severity of the impact of the present invention is judged: ϊ ί m m ΐ ί ί according to the reverse direction of the vehicle 12 in the driving direction plus the second speed production number " speed clock degrees, and then, borrow Based on the analog / digital converter 15-segment ί 5 ϊ ϊ, Λ \ bit acceleration signal G, and finally, according to "Eiyi's design of the impact severity judgment circuit 16 will also produce a judgment to determine the severity of the impact of the vehicle 12 impact At the same time, isiimf—as an electronic control unit firing the airbag device. See the design flow chart in Figure 4. The impact severity judgment circuit 16 shown in the fft of the present invention. Therefore, the following is needed: Designed, Ming, where the design flow of the impact severity judgment circuit 16 is proposed to establish the model, fuzzy rules μ The design flow of the circuit 16 includes the test mode stage, as shown in Figure 4; The establishment of four test models such as simulation test] 490409 V. Description of the invention (8) The purpose of establishing the test model is to hope that after obtaining the experimental data, a computer program can be used to add the vehicle 12 to the acceleration sensor 4 when it impacts. Speed physical characteristics are simulated to enable fuzzy rule design. The design of the impact severity determination circuit 16 of the impact severity determination device 10 of the present invention is implemented. The embodiment uses two sets of impact wave test data data akfl, akf2 provided by the Auto 1 iv French branch, and reference data a [A Predictive Based Algorithm for Actuation of an Airbag, T. Gioutsos, Automotive System Lab ·, Inc · SAE920479] proposed two sets of data materials, such as 30mph and rough road, and reference material B [The Use of Signal Processing Techniques in an Occupant Detection System, EJ · Gillis, T. Gioutosos, Automotive System Lab ·, Inc · SAE940 9 0 6] two sets of data, such as 17mph and 8mph, are used to find out the four physical characteristics of the vehicle when it hits 12, and also That is, the first displacement fuzzy input variable displ, the second displacement fuzzy input variable disp2, the time interval fuzzy input variable, and the cumulative number of fuzzy input variables n jerk. Due to different impacts, different physical characteristic values are generated. , You can find the correlation between the physical characteristics and the severity of the impact, so it can be used as an impact severity judgment Basis for designing fuzzy rules for circuit breaking 16. Say

[Fuzzy Rule Design] Please refer to Table 1. Table 1 shows the impact severity judgment circuit shown in Figure 4.

Page 12 490409 V. Description of the invention (9)--Fuzzy rule table. The plurality of fuzzy rules of the impact judging device of the present invention are: the control core of the hit severity judgment circuit, and each fuzzy rule is composed of if (if) · · · (then) ... A part describes the input condition of the first half of the impact severity judgment circuit 16, and a part of the η describes the reaction condition of the second half of the impact severity judgment circuit 16. Each fuzzy rule is finally passed through a fuzzy inference procedure to obtain a fuzzy value, and this fuzzy value is converted into a digital value by a defuzzification procedure. In order to make the inference rules more rigorous, so as to cope with various impact situations, the fuzzy rule design of the impact severity judgment circuit 16 in this embodiment uses a "two-stage fuzzy control algorithm", and the design details are as follows: The design of the fuzzy rules in the first stage mainly uses the first displacement fuzzy input variable displ to determine whether it is a "severe collision". If the first displacement fuzzy input variable disp 1 does not respond, the collision severity judgment circuit 16-will be at Waiting state. When the acceleration value of the digital acceleration signal G in an impact exceeds a certain initial value, the fuzzy control unit 24 of the impact severity determination circuit 16 will start to calculate the displacement amount within a specific time, that is, calculate and generate the first The value of a displacement fuzzy input variable displ. If the value of (if) the first displacement fuzzy input variable (1 丨 31) 1 is greater than a set value, (the η) is immediately judged as "severe impact"; if (if) The value of the first displacement fuzzy input variable displ is in another specific range that is lower than the set value. The collision severity determination circuit 16 does not make a decision within the specific time, but instead Then make a decision, that is, enter the second stage of fuzzy rule design. ·

Page 13 490409 V. Description of the invention The fuzzy rule design in the second stage mainly uses the first displacement fuzzy input variable displ, the second displacement fuzzy input variable (1) [3132, time interval fuzzy input variable tw, and the cumulative number of times. The fuzzy wheel-in variable n jerk is used to determine whether the impact is "severe impact" or "moderate impact" or "mild impact." When the impact severity determination circuit 16 does not determine "severe impact" within that specific time , The fuzzy control unit 24 of the impact severity judgment circuit 6 will continue to calculate the total displacement generated by the digital acceleration signal g after exceeding the initial specific value, that is, the second displacement fuzzy input variable (1 i sp 2 of Value 'the cumulative number of times that the digital acceleration signal G has exceeded a critical value since the specific value was exceeded, that is, the value of the cumulative number of fuzzy input variables njerk' and the digital acceleration signal G's first product value after exceeding the start value The time interval between J reaching the Bm boundary value, that is, the value of the time interval fuzzy input variable ^ slave, is used as the reference basis for judging the severity of the impact in the second stage. The second phase of the fuzzy rule design uses time interval fuzzy, input variable tw and cumulative number of fuzzy input variables 11 The purpose of jerk is mainly to determine the impact of the power rate on the severity of the impact, so the following is for the power rate The theoretical basis of the severity of the impact is put forward. First, the expression of the power p is derived from the formula, as shown below: E = 1 / 2m · V2 P = dE / dt = m. V · g G = dV / dt

Page 14 490409 V. Description of the invention (11) where E represents energy’m represents mass, v represents speed, p power, t represents time, G represents acceleration, and power rate of change g 彳,,

The differential I for time t is the power P dP / dt = mGHm · V · J, J = dG / dt where J represents the value of the product grams, that is, the acceleration G for the supply of time seven can be found from the expression of the power rate of change, When V does not change much, accumulate a knife. Change is the main factor affecting power variability. When the cumulative value J of the accumulated value J, bound: more: 'that is, the greater the value of the second jerk in the fuzzy input of the cumulative number, it means that the power change at this moment = more energy E accumulated in a short time, That is to say, the impact is: according to the above-mentioned fuzzy rules for the phase (1), if the first and second displacement fuzzy input input variables tw know that the threshold value exceeds the threshold, and it exceeds 10, it also changes. Severe collision (2) If the description of the change in energy E when the first and second displacement fuzzy input input variables tw can collide, it can be applied to the second establishment. The description with Table 1 is as follows:, = The value of the shift fuzzy input variable displ is about 0 · 3. The value of the 1st sρ2 exceeds 1, and the time interval is changed from fuzzy to f. A product value can be entered in the first 5ms of the impact, and the number of times of fuzzy input variables is 11. The cumulative number of jerk U-meters causes the product product to produce the product value first. The larger the amount of j, the greater the amount of displacement. The value of the model input variable displ is about 0, the value of == disp2 is 55, and the time interval is ambiguous. If you get up before the first 5ms, the cumulative number of times

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4VU4UV, the description of the invention (12), the male input variable n jerk of 如 7 such as ..e, the quantity first causes the product value jd, and after 10, it represents the energy displacement at the time of the impact, then this type is six μ, There is a moderate bit in about 20ms (the impact of nt represents "moderate impact". The value of the interval mode input variable idjsp2 exceeds 1, and the value of 1 ^ is equal when the time hits. When it exceeds the limit, it means the collision. ”If the field and% are set, this type of collision represents“ moderate collision with two-position (shift 4). The mode is ambiguous. The value of the input variable dispi is about 0.3. The first input variable is tw. The value of Isp2 can exceed 1, but the fuzzy input variable at the time interval occurs after 20%, and the cumulative number of fuzzy inputs-^ ^ L Μ ί The value of 5 shift fuzzy input variables displ is about 0.3, No .: # 1+, & 2) The value of the variable diSP2 exceeds 1, but the time interval is ambiguous. ^^ ^^ It is also classified as "moderate \ yu; 0". This type of impact is still not a serious impact. Helmet n If the M-th displacement fuzzy wheel input variable displ is only a small displacement, about > right, the amount of the t-th displacement fuzzy input variable disp2 is not large, about ^ 90, right 'simultaneous time When the interval fuzzy input variable tw can be started after the impact, and the value of the cumulative number of fuzzy input variables n j erk is also less than 4, this type of impact represents a "light impact". , The design results of fuzzy rules in the first and second stages above σ,

490409

The impact severity of the impact severity determining device of the present invention can be summarized into ten fuzzy rules, as shown in Table 1. ㉟Circuit 16 can be [Design of the attribution function] Refer to Table 1 for details. Table 1 is the correspondence table between the control circuit and the language items shown in Figure 3. In the present invention, the impact severity judgment is based on the fuzzy severity severity judgment circuit 16. The fuzzy variables include the first number of knocks, displ, and the second displacement fuzzy wheel-in variable. "I, time gate = wheel-in variable. tw, cumulative number of fuzzy round-in variables 11] · erk and ° module * fuzzy input and output variables svty, where the first displacement fuzzy input variable d ^ fuzzy design includes very low, iow, medium, high, mouth broken, etc. Five language terms (Linguistic terms), the second # For Jery — hlgh number disP2, time interval fuzzy input variables, seven cumulative fuzzy input variables-and severity fuzzy input = = there are three language terms: low, medium, high For example, if the skin sigh is 0 = the affiliation function of a language term is defined by a triangle function, and the parent circuit / = 图 ίί 五 ίJ5 is the impact severity judgment shown in Figure 3 == belonging function " (displ) Schematic diagram, figure, number MdiSp2), Figure 7 is a schematic diagram of the impact severity of the impact shown in Figure 3 / 'K Road 1' attribution function Chuan ... Figure 8 is the non-impact weight determination circuit 16 of Figure 2 Cumulative number of attribution letters

Page 17 490409 V. Description of the invention (14) --------- Schematic diagram of the number // (njerk), Figure 9 is the severity output impact function of the impact severity judgment shown in Figure 3 = 16 " The diagram of "Take". The so-called turn-in = general function is mainly the if part of the fuzzy inference that defines the inference of the input control amount. According to the analysis and test results of the foregoing test model, In this embodiment, the physical characteristics hspl, disP2, tw, and njerk at the time of the impact of the vehicle 2 are used as input assignment functions for design. The first displacement input assignment function # (displ) is shown in FIG. 5, and the first displacement The input ^ attribution function is shown in Figure 6, and the time interval input attribution function is shown in Figure 7. 'The cumulative number of input attribution functions is shown in Figure 8. Furthermore, the output attribution function is f · · then which defines fuzzy inference. • Then / part, because the purpose of the impact severity judgment circuit 6 is to determine the severity of the collision, so take a control setting of the severity output attribution function not output, as shown in Figure 9. [Simulation test] Simulation test The purpose is to verify the occurrence of various impacts, and whether the impact severity can be determined immediately through the impact severity determination circuit 16. Therefore, the following is the use of developed test models, fuzzy rules, and attribution functions in conjunction with the Autoliv French branch Two sets of shock wave test data akf 1, akf2 are provided. The impact data of 30mph and rough road proposed by reference a, and the impact data of 17mph and 8mph proposed by reference a, I use "two "Segmented paste control algorithm" to conduct simulation tests to prove the impact severity judgment device of the present invention

Page 18 490409 V. Description of the invention (15) The practicability and rigor of the collision severity judgment circuit 16. Please refer to Table 3, Table 4, and Figures 10 to 13. Table 3 is the test result table of the akf 1 test data of the impact severity judgment circuit 16 shown in Figure 3. Table 4 is the impact severity judgment shown in Figure 3. The test result table of the akf 2 test data of circuit 16 is shown in Figs. 10 to 13 respectively, which are schematic diagrams of test results of test data of 30 mph 'rough road, 17 mph, and 8 mph of impact severity judgment circuit 16 shown in FIG. 3. The test results and analysis of impact data such as 30mph 'rough road, 17mph, and 8mph proposed by Aut ο 1 iv French branch company for two types of impact wave test data akf 1, akf 2 and reference materials A and B are as follows Shows: (1) The test is performed on 5 2 records of ak f 1, and the test results are shown in Table 3. The test results are ideal. (2) The test was performed on 15 data of a k f 2. The test results are shown in Table 4. Each test was successful. (3) The impact data of 30mph, rough road, 17mph, and 8mph proposed by reference materials a and b were tested. After the simulation test, all of them were also tested, as shown in Figures 10 to 13. For the impact test of 30 mph, Lu's judged that it was a severe impact at about 15ms. Compared with the result of reference a, 18.8ms, it was 3.8ms faster, as shown in Figure 10. For r〇ugh r〇ad For the impact test, it has been maintained at a light impact, as shown in Figure 11; ^ For a 17mph impact test, it is judged as a moderate impact at about 28ms, if shown at twelve; for an impact of 8mph In terms of testing, it has been maintained at a light impact, and this result can reach the same as described in reference B

490409 V. Description of the invention (16) is divided into two moderate impacts with similar impact waveforms, as shown in the algorithm of device 10 shown in Figure 13. "How to design the signal displacement of the occupant due to the impact of the impact, The launch time was “two-stage measurement” and “3. 8 m ahead was used to determine the impact wave of the airbag. After filling in the“ differentiation of the above simulation test results, it can be seen that the impact severity determination circuit 16 of the present invention uses "Two-stage fuzzy control can simultaneously meet a variety of different needs. In Reference A, it is emphasized that the speed change cannot distinguish between 30mph and rough road. Therefore, the product value J is used to make predictions, but the algorithm is not described. Ming. In Reference B, it is explained that the members measured by Noise Reduction (Occupant Position Sensor) when processed with impact distinguish the moderate and light impact waveforms with similar appearance, but The description of the touch is not explained. The design method of the fuzzy control algorithm used in the impact severity determination device 10 of the present invention is simple and has a "pre-distance" It can, for impact than 30mph A reference mention s, can also further differentiate the impact of rough road characteristics. The similar shape of 17 mph and 8 mph can also be distinguished. For a "moderate impact", it can be completed within the first 30 ms of the impact. The "two-stage fuzzy control algorithm" also has "timely" ”Function, at the same time a wide range of applications and strong judgment. Compared with the conventional technology, the impact severity determination device 10 of the present invention adopts a "two-stage fuzzy control algorithm" to design the impact severity determination circuit 16. The first stage uses the digital acceleration signal G in a preset The amount of displacement generated during the period (10 ms) to determine whether the impact is `` severe

Page 20 490409 V. Description of the invention (17) Strike "; if the impact cannot be judged as" severe shock "during this period, then enter the second stage, the impact severity judgment circuit 16 will continue to use the digital acceleration signal G The total displacement generated after exceeding the starting specific value, the cumulative number of times that the product of the digital acceleration signal G exceeds a critical value, and the time when the digital acceleration signal G reaches the critical value for the first time after exceeding the starting specific value Interval to determine whether the impact is "severe impact" or "moderate impact" or "light impact". Furthermore, simulation results using two sets of data provided by the French branch of Aut ο 1 iv French branch and four sets of typical data discussed in reference materials A and B show that the impact severity determination device 10 of the present invention uses The "two-stage fuzzy control algorithm" has both "timely" and "differentiation" functions. The designed impact severity judgment circuit 16 can also distinguish the severity of the impact and generate a judgment signal in a very short time. S, as one of the control signals of the electronic control unit 20 firing the airbag device 18. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in the patentable scope of the present invention shall fall within the scope of the patent of the present invention.

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Claims (1)

490409 VI. Scope of patent application 1. A strict accelerometer when a vehicle collides with a front end and generates an acceleration-impact serious instrument, which can be set according to the acceleration of the installed vehicle; the degree of confidence is determined as the value of the continuation of strict continuation The output is the time when the start value number hits a heavy impact according to the time when the gram value is exceeded, and the impact should be added. It is preset that if the acceleration is over, the severe impact severity determination device is used to determine when the vehicle is severe, which includes: It is provided on the vehicle to sense the acceleration signal of the vehicle; and a sex determination circuit is provided on the vehicle and electrically connected to the acceleration signal output by the accelerometer to determine the severity of the impact and output it. The terminal generates a judgment signal that the acceleration value of an impact signal in an impact exceeds a pre-determined impact severity judgment circuit that will begin to determine whether the impact is a non-severe impact based on the amount of displacement generated during the acceleration period. The amount of displacement generated by the circuit's degree signal, the cumulative number of times the threshold value of the acceleration signal, and the first product Pro value reaches the means to determine the severity of the impact, and until a judgment of a signal. 2. For the impact judging device according to item 1 of the scope of patent application, wherein the "cumulative number" of the acceleration signal is the accumulation of the number of times that the product's gram value generated by differentiating the acceleration signal with respect to time exceeds a critical value. As for the π time interval π, it is the digital acceleration signal G, which is the time difference between the first accumulative value and the critical value after the start value is exceeded. 3. For the impact severity judgment device in the scope of patent application, item 1, Page 22 490409 VI. Patent application scope When the impact severity judgment circuit judges that the impact is not a severe impact at the end of the preset period, the impact severity judgment circuit will continue to use the acceleration signal after exceeding the start value. The total displacement generated and the cumulative number of times that the accumulative signal exceeds the threshold after the acceleration signal exceeds the threshold value are used to determine the severity of the impact of the device until the determination signal is generated. 4. For the impact severity determination device of the first patent application range, wherein the impact severity determination circuit will additionally determine the time interval between the acceleration signal reaching the critical value after exceeding the start value and the acceleration signal 加速度 B The amount of displacement generated within the preset time interval is used to judge the impact severity of the device until the judgment signal is generated. 5. If the impact severity determination device of the first patent application range, wherein when the impact severity determination circuit determines that the impact is a severe impact based on the displacement of the acceleration signal in the preset period, the impact The severity judgment circuit generates a judgment signal representing a severe impact at its output. 6. For the impact severity determination device of the scope of patent application, the impact severity determination circuit includes: ® a memory for storing a plurality of fuzzy rules; and a fuzzy control unit unit), which is electrically connected to the accelerometer, and is used to convert the acceleration signal into the 490409 according to several fuzzy rules. 6. The patent application scope impact severity judgment signal. The module generates a first product number after adding displacement. The paste control variable and accumulative number are the impact severity judgment device according to item 6 of the patent application scope, wherein the paste control unit will generate the acceleration signal representative of the acceleration signal in the preset period according to the acceleration signal generated by the accelerometer. The displacement fuzzy input variable of the generated displacement amount, a second fuzzy input variable representing the total displacement amount generated by the speed signal since exceeding the activation value, and a gram value representing the acceleration signal since exceeding the activation value. The time interval of the time interval when the critical value is reached is fuzzy input change and a signal representing that the acceleration signal has exceeded the The cumulative number of cumulative times of the cumulative value of the excess product value after the momentum value is fuzzy input variables, and then the molding unit will blur the first displacement fuzzy input, the second displacement fuzzy input variable, and the time interval according to the fuzzy rules. The input variable is converted into an impact severity fuzzy output variable by a product number fuzzy input variable and finally the fuzzy control unit converts the severity fuzzy output variable into an impact severity judgment signal. Page 24