CN103112421A

CN103112421A - Vehicle collision decision device

Info

Publication number: CN103112421A
Application number: CN2012105972481A
Authority: CN
Inventors: 大崎达治; 曾杰男
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd; Keihin Corp
Priority date: 2011-11-16
Filing date: 2012-11-14
Publication date: 2013-05-22
Also published as: JP2013103683A; JP5816533B2; DE102012021272A1

Abstract

The invention provides a vehicle collision decision device comprising a vibration detecting device for detecting high-frequency vibration of voice band generated on a vehicle with an extending frame and low-frequency vibration with a frequency band lower than the voice band, wherein the extending frame is provided with a plurality of absorption areas for absorbing collision impact; a threshold value judging and switching device for determining whether to switch a collision determination threshold value based on energy change of the high-frequency vibration and integral value of the low-frequency vibration calculated by crush of any absorption region of the plurality of the absorption areas arranged on the extending frame; and a collision determination device for determining collision through comparing collision determination threshold value and the integral value set based on the determination results.

Description

Collision determining apparatus for vehicle

Technical field

The present invention relates to collision determining apparatus for vehicle.

Background technology

Usually, as the system that is used for protection passenger when the vehicle collision, known have a SRS (Supplemental Restraint System: supplemental restraint system) gas-bag system.This SRS gas-bag system detects the device for passenger protection such as the generation of vehicle collision, and starting air bag based on the acceleration information that obtains from the acceleration pick-up that is arranged on the vehicle each several part.

A kind of like this SRS gas-bag system is disclosed in Japanese kokai publication hei 10-287203 communique, it also has a plurality of frontal collision sensors that are arranged on front part of vehicle except the cell sensor that is arranged on the SRS unit (ECU of overall control SRS gas-bag system) that is positioned at vehicle central section.In this system; determine whether based on the acceleration information from cell sensor and the acquisition of frontal collision sensor frontal collision (comprising head-on crash, biasing (offset) collision and oblique collision) occurs, and carry out the starting control of device for passenger protection according to this result of determination.

In addition, in recent years, researching and developing CISS (Crash Impact Sound Sensing: clash into sound detection) technology, the impulsive sound that the car body distortion when this technology adopts sound transducer to detect by collision produces, and carry out collision determination based on this testing result.Japanese Unexamined Patent Application Publication 2001-519268 communique discloses employing body (bulk) sonic sensor and has detected the vibration of the bulk acoustic wave of upper horizontal (transversal) that occurs of car body element (longeron (side member)) when vehicle collision, and carries out collision determination based on this testing result.

In addition, although above-mentioned acceleration pick-up and sound transducer all belong to the vibration sensor that detects vibration, the frequency band that detects the other side's vibration is different.Usually, the acceleration pick-up measurement bandwidth is the low-frequency vibration of 0Hz～400Hz and as acceleration information output, and the sound transducer measurement bandwidth is the high-frequency vibration of 5kHz～20kHz (voiceband) and exports as voice data.

Yet; in Japanese kokai publication hei 10-287203 communique, except cell sensor, also adopt the frontal collision sensor; to judge that rapidly and correctly the vehicle collision pattern is the pattern that needs the starting device for passenger protection, the pattern that does not still need to start device for passenger protection.In addition, needing the crash mode of starting device for passenger protection is for example the high speed offset collision, and the crash mode that does not need to start device for passenger protection is for example the low speed offset collision.

Particularly, car body distortion less vehicle central section place when being located at frontal collision due to cell sensor, thus light when collision occurs show to the sensor output can correct decision crash mode degree the time (approximately more than 40ms) that will grow of large difference.Here, from protection passenger's viewpoint, it is desirable to light when collision occurs and start device for passenger protection between 20～30ms, so only the range site sensor can not satisfy desired occupant protection performance.Therefore, in the past, the larger front part of vehicle of car body distortion when colliding in front arranged the frontal collision sensor and realized rapid and correct collision determination.

It is the major cause that causes system cost to rise due to the frontal collision sensor; carry out collision determination so it is desirable to only utilize the cell sensor that is built in the SRS unit; but as mentioned above, only the range site sensor can not satisfy desired occupant protection performance.So, as cell sensor, replace acceleration pick-up and use sound transducer, to attempt the not system and arranging of front shock sensor.The voice data that obtains from sound transducer is considered to have the tendency of the feature that is easy to catch car body distortion (damage), and the differentiation of crash mode is also easy, for realizing that rapid and correct collision determination is actv..

Yet the voice data that obtains from sound transducer during collision not only comprises the damage sound of own vehicle, also comprises the relevant sound that collide the other side (for example, impacting sound, collide the other side's damage sound during collision).Here, the frequency content of collision the other side's relevant sound and big or small structure according to collision the other side, material etc. change larger, so exist the collision determination precision due to collision the other side variation problem greatly.In addition, the vibration component of voiceband is easy to decay in from damaged location (car body collision position) to the interval that arrives the SRS unit, and due to the difference on body Structure, the degree of decay is also different, so there is the unsettled problem of collision determination precision.

Summary of the invention

The difference that the purpose of this invention is to provide a kind of structure that no matter collides the other side, material how can both stably obtain high collision determination precision and collision determining apparatus for vehicle.

(1) a kind of mode of the present invention comprises: vibration detection device, it detects in the low-frequency vibration lower than described voiceband of the high-frequency vibration with the voiceband that produces on the vehicle that lengthens vehicle frame and frequency band, the absorption region of the impact when described lengthening vehicle frame is provided with a plurality of absorptions collision; The first arithmetical device, it calculates the energy changing amount of described high-frequency vibration; The second arithmetical device, it calculates the integrated value of described low-frequency vibration; Threshold value switching judging device, it is based on described energy changing amount and the described integrated value calculated due to the arbitrary absorption region conquassation in the described a plurality of absorption regions that are located on described lengthening vehicle frame (Collapse れ Ru), judge whether that needs switch the collision determination threshold value, described collision determination threshold value is used in the collision determination of the collision whether needs starting device for passenger protection occurs; And collision determination device, by described collision determination threshold value and the described integrated value of relatively setting according to the judged result of described threshold value switching judging device, carry out described collision determination.

(2) in the mode of above-mentioned (1) record, can adopt following structure: described the second arithmetical device is calculated integrated value and the quadratic integral value of described low-frequency vibration; Described threshold value switching judging device by relatively take the energy changing amount of described high-frequency vibration as the first axle and the first threshold of setting on take the quadratic integral value of described low-frequency vibration as the X-Y scheme of the second axle, with described energy changing amount and the described quadratic integral value of utilizing described the first arithmetical device and described the second arithmetical device to calculate, judge whether to need to switch described collision determination threshold value; Described collision determination device comparison take an integrated value of described low-frequency vibration as the first axle and the described collision determination threshold value of setting according to the judged result of described threshold value switching judging device on take the quadratic integral value of described low-frequency vibration as the X-Y scheme of the second axle, with a described integrated value and the described quadratic integral value of utilizing described the second arithmetical device to calculate.

(3) in the mode of above-mentioned (1) record, can adopt following structure: described the first arithmetical device is also calculated the energy changing amount and the energy changing amount that is included in the vibration component of the second frequency band in described high-frequency vibration of the vibration component that is included in the first frequency band in described high-frequency vibration except the energy changing amount of calculating described high-frequency vibration; Described the second arithmetical device is calculated integrated value and the quadratic integral value of described low-frequency vibration; Described threshold value switching judging device comprises: the first judgment means, its by relatively take the energy changing amount of described high-frequency vibration as the first axle and the first threshold of setting on take the quadratic integral value of described low-frequency vibration as the X-Y scheme of the second axle, with described energy changing amount and the described quadratic integral value of utilizing described the first arithmetical device and described the second arithmetical device to calculate, whether need to switch the first threshold switching judging of described collision determination threshold value; The second judgment means, its by relatively take the energy changing amount of the vibration component of described the first frequency band as the first axle and the Second Threshold of setting on take the energy changing amount of the vibration component of described the second frequency band as the X-Y scheme of the second axle, with the energy changing amount of the vibration component of described first, second frequency band that utilizes described the first arithmetical device to calculate, whether need to switch the Second Threshold switching judging of described collision determination threshold value; And final switching judging device, whether its judged result judgement based on described first, second threshold value switching judging finally needs to switch described collision determination threshold value; Described collision determination device comparison take an integrated value of described low-frequency vibration as the first axle and the described collision determination threshold value of setting according to the judged result of described final switching judging device on take the quadratic integral value of described low-frequency vibration as the X-Y scheme of the second axle, with a described integrated value and the described quadratic integral value of utilizing described the second arithmetical device to calculate.

(4) in the mode that in above-mentioned (1) to (3), any one is put down in writing, described vibration detection device can have: measurement bandwidth is that the vibration of 5kHz～20kHz is as the first vibration sensor of described high-frequency vibration; And measurement bandwidth is that the vibration of 0Hz～400Hz is as the second vibration sensor of described low-frequency vibration.

(5) in above-mentioned (1) to (4) in the mode of any one record, described lengthening vehicle frame can be to be formed with rib or hole in the boundary portion office of described absorption region, and is arranged on the tubular vehicle frame of front part of vehicle.

(6) in the mode that in above-mentioned (1) to (4), any one is put down in writing, described lengthening vehicle frame is that described a plurality of absorption region is mutual different material or structures, and is arranged on the tubular vehicle frame of front part of vehicle.

According to mode of the present invention, no matter collide the other side's structure, how the difference of material can both stably obtain high collision determination precision.That is to say; according to mode of the present invention, no matter collide the difference of the other side's structure, material and how can both differentiate the collision (comprising the high speed offset collision in the interior fierceness collision of following the car body distortion) that needs the starting device for passenger protection and the collision that does not need to start device for passenger protection (comprising the part that the low speed offset collision causes in the slight gentleness collision of interior car body distortion, by slungshot etc. hits) with high collision determination stable accuracy ground.

Description of drawings

Figure 1A～1C means the planar view of schematic configuration of the vehicle of the SRS gas-bag system with one embodiment of the present invention.

Fig. 2 A～2C means the block diagram of the structure of the main portion structure of SRS unit of one embodiment of the present invention and Δ E calculating section 13.

The figure that the time of the voice data S (t) that obtains from sound transducer when Fig. 3 A～3D means respectively the figure of the X-Y scheme that uses in collision determination and expression high speed offset collision and during the low speed offset collision changes.

Fig. 4 A, 4B mean the block diagram of the variation of SRS unit.

Label declaration

Unit 1...SRS (collision determining apparatus for vehicle),

2... air bag (device for passenger protection),

11... sound transducer (vibration detection device, the first vibration sensor),

12... acceleration pick-up (vibration detection device, the second vibration sensor),

13... Δ E calculating section (the first arithmetical device),

14... a BPF (the first arithmetical device),

15... the 2nd BPF (the first arithmetical device),

16... Δ E1 calculating section (the first arithmetical device),

17... Δ E2 calculating section (the first arithmetical device),

18... Δ S calculating section (the second arithmetical device),

19... Δ V calculating section (the second arithmetical device),

20... Δ S-Δ E figure detection unit (threshold value switching judging device, the first judgment means),

21... Δ E1-Δ E2 figure detection unit (threshold value switching judging device, the second judgment means),

22... " with " (AND) section's (threshold value switching judging device, final switching judging device),

23... Δ S-Δ V figure detection unit (collision determination device),

24... the first comparing section (threshold value switching judging device),

25... threshold value selection portion (collision determination device),

26... the second comparing section (collision determination device),

27... the first comparing section (threshold value switching judging device),

28... threshold value selection portion (collision determination device),

29... the second comparing section (collision determination device),

100... vehicle,

111... extension vehicle frame (lengthening vehicle frame),

A1, the A2... absorption region.

The specific embodiment

Below, the collision determining apparatus for vehicle of the embodiment that present invention will be described in detail with reference to the accompanying.Figure 1A～1C means the planar view of schematic configuration of the vehicle of the SRS gas-bag system with one embodiment of the present invention.As shown in Figure 1A, be located at SRS gas-bag system on vehicle 100 by SRS unit 1 (collision determining apparatus for vehicle) that is arranged on vehicle 100 central portions and be separately positioned on the operator's saddle of vehicle 100 and the air bag 2 (device for passenger protection) of vice operator's seat consists of.

SRS unit 1 is ECU (Electronic Control Unit: electronic control unit), its output signal based on built-in sound transducer 11 and acceleration pick-up 12 carries out the judgement (collision determination) whether vehicle 100 frontal collision has occured, and carries out the starting control of air bag 2 according to this collision determination result.Air bag 2 is device for passenger protection, and it is in response to from the ignition signal of SRS unit 1 and launch, and the passenger who causes with the frontal collision that alleviates due to vehicle 100 forwards secondary collision is hurt.In addition, usually, except air bag 2, also be provided with other device for passenger protection such as seat belt pretensioner (seat belt pretensioner) on vehicle 100, but omitted diagram in Figure 1A.

Here, as shown in Figure 1A, the extension vehicle frame (extension flame) 111 (lengthening vehicle frame) of the impact the when front portion of vehicle 100 (right front portion and left front section) is provided with for the absorption collision.

This extends vehicle frame 111 is the absorption region A1 that is provided with a plurality of impacts when absorbing collision, the cylindrical member of A2, and is arranged on forwards outstanding state on the leading section of the vehicle frame 110 that the fore-and-aft direction (directions X in Figure 1A) along vehicle 100 extends.Extension vehicle frame 111 is constituted as in the situation that the opposing party's conquassation after the either party's conquassation in vehicle 100 generation frontal collision absorption region A1, A2.In addition, below, for easy understanding, extend vehicle frame 111 after the A1 conquassation of absorption region, absorption region A2 conquassation.

A plurality of absorption region A1, A2 are set on vehicle frame 111 is in order stably to obtain high collision determination precision extending, and regardless of the difference of the structure that collides the other side, material.That is to say, by get rid of the voice data that obtains from sound transducer 11 (voice data that contains the frequency content of the structure that depends on collision the other side, material) during the absorption region A1 conquassation of extending vehicle frame 111, and adopt the voice data that obtains from sound transducer 11 due to absorption region A1 conquassation to carry out collision determination, obtain high collision determination precision.

Here, because extend the absorption region A1 of vehicle frame 111 in case conquassation fully becomes rigid body, so due to absorption region A1 conquassation, rigid body (absorption region A1) impact absorption zone A2 is so absorption region A2 begins conquassation.The material of the rigid body that is formed by absorption region A1 conquassation is known, the structure of the absorption region A2 that this rigid body collides and material are also known, so can obtain voice data due to the given frequency composition of structure that absorption region A1 conquassation containing of causing do not rely on collision the other side, material from sound transducer 11.Thus, if use this voice data to carry out collision determination, can obtain high collision determination precision.

Figure 1B, 1C are the planar views that schematically shows the extension vehicle frame of vehicle 100.Extension vehicle frame 111 shown in Figure 1B processes to arrange a plurality of absorption region A1, A2 by carry out rib (rib) processing or perforate in the side.In addition, in the example shown in Figure 1A, form hole H by the boundary member at absorption region A1, A2 a plurality of absorption region A1, A2 are set.

Extension vehicle frame 111 shown in Fig. 1 C is by utilizing mutually different materials or tectosome formation leading section and basic courses department that a plurality of absorption region A1, A2 are set.

Can consider that cost etc. suitably determines to adopt and extend any in vehicle frame 111 shown in Figure 1B, 1C.In addition, be illustrated for the example that extends vehicle frame 111 and be provided with two absorption region A1, A2 in the present embodiment, but also the absorption region more than three can be set.

Fig. 2 A means the block diagram according to the main portion structure of the SRS unit of one embodiment of the present invention.as shown in Fig. 2 A, SRS unit 1 comprises sound transducer 11 (the first vibration sensor), acceleration pick-up 12 (the second vibration sensor), Δ E calculating section 13, the one BPF (bandpass filter) 14, the 2nd BPF15, Δ E1 calculating section 16, Δ E2 calculating section 17, Δ S calculating section 18, Δ V calculating section 19, Δ S-Δ E figure detection unit 20 (the first judgment means), Δ E1-Δ E2 figure detection unit 21 (the second judgment means), " with " (AND) section 22 (final switching judging device), and Δ S-Δ V figure detection unit 23 (collision determination devices).

In addition, in above-mentioned inscape, sound transducer 11 and acceleration pick-up 12 are equivalent to vibration detection device of the present invention.In addition, Δ E calculating section 13, a BPF14, the 2nd BPF15, Δ E1 calculating section 16 and Δ E2 calculating section 17 are equivalent to the first arithmetical device of the present invention, and Δ S calculating section 18 and Δ V calculating section 19 are equivalent to the second arithmetical device of the present invention.And, Δ S-Δ E figure detection unit 20, Δ E1-Δ E2 figure detection unit 21 and " with " section 22 is equivalent to threshold value switching judging device of the present invention.

Sound transducer 11 is the vibratioies sensor that are built in SRS unit 1, it detects the high-frequency vibration at the upper voiceband that produces of fore-and-aft direction (directions X in Figure 1A) of vehicle 100, and this testing result is exported to Δ E calculating section 13, a BPF14 and the 2nd BPF15 as voice data S (t).Particularly, sound transducer 11 measurement bandwidths are the vibration (structure sound) of 5kHz～20kHz.The voice data S (t) that obtains from this sound transducer 11 has caught the feature that the vehicle 100 that causes due to frontal collision is out of shape (damage) well.

Acceleration pick-up 12 is the vibratioies sensor that are built in SRS unit 1, it detects the frequency band produce lower than the low-frequency vibration of voiceband on the fore-and-aft direction of vehicle 100, and this testing result is exported to Δ S calculating section 18 and Δ V calculating section 19 as acceleration information G (t).Particularly, acceleration pick-up 12 measurement bandwidths are the vibration of 0Hz～400Hz.The acceleration information G (t) that obtains from this acceleration pick-up 12 has caught the deceleration/decel that produces at vehicle 100 due to frontal collision well.

Like this, sound transducer 11 and acceleration pick-up 12 all belong to the vibration sensor that detects vibration, but the frequency band of detected object vibration is different.In addition, sound transducer 11 and acceleration pick-up 12 can be located at as shown in Figure 1A in SRS unit 1 individually, perhaps also can be built in a sensor group (cell).

Δ E calculating section 13 calculates the energy changing amount Δ E from the voice data S of sound transducer 11 (t), and this is calculated result export to Δ S-Δ E figure detection unit 20.Fig. 2 B means the block diagram of the structure of Δ E calculating section 13.As shown in Fig. 2 B, Δ E calculating section 13 comprises absolute value calculating section 13a and the interval integral 13b of section.Absolute value calculating section 13a calculates the absolute value from the voice data S of sound transducer 11 (t) | S (t) |, and this is calculated result export to the interval integral 13b of section.The absolute value of the 13b of interval integral section by absolute value calculating section 13a is calculated | S (t) | carry out interval integral and calculate energy changing amount Δ E, and this is calculated result export to Δ S-Δ E figure detection unit 20.

Originally, the energy changing amount Δ E of voice data S (t) can be by the interval integral of square carrying out to voice data S (t), namely as shown in following (1) formula, by in the certain hour interval to { S (t) } ²Sue for peace and obtain.Yet, in the present embodiment in order to alleviate the load of calculating processing that carries out energy changing amount Δ E, as shown in following (2) formula, by the absolute value to voice data S (t) | S (t) | carry out interval integral (suing for peace) and calculate approx energy changing amount Δ E in the certain hour interval.

ΔE＝∑{S(t)} ² ...(1)

ΔE≈∑|S(t)| ...(2)

The one BPF14 is from being the vibration component (vibration component of the first frequency band) of 5kHz～15kHz from extracting frequency band the voice data S (t) of sound transducer 11, and the vibration component of this extraction is exported to Δ E1 calculating section 16 as the first frequency band voice data S1 (t).The 2nd BPF15 is from being the vibration component (vibration component of the second frequency band) of 15kHz～20kHz from extracting frequency band the voice data S (t) of sound transducer 11, and the vibration component of this extraction is exported to Δ E2 calculating section 17 as the second frequency band voice data S2 (t).

Δ E1 calculating section 16 calculate from the energy changing amount Δ E1 of the first frequency band voice data S1 (t) of a BPF14 (the energy changing amount of the vibration component of the first frequency band: below, be called " the first frequency band energy variation delta E1 "), and this is calculated result export to Δ E1-Δ E2 figure detection unit 21.Δ E2 calculating section 17 calculate from the energy changing amount Δ E2 of the second frequency band voice data S2 (t) of the 2nd BPF15 (the energy changing amount of the vibration component of the second frequency band: below, be called " the second frequency band energy variation delta E2 "), and this is calculated result export to Δ E1-Δ E2 figure detection unit 21.In addition, the calculation method of first, second frequency band energy variation delta E1, Δ E2 is the same with the calculation method of energy changing amount Δ E.

Δ S calculating section 18 is by carrying out the amount of movement Δ S (quadratic integral value) that the secondary interval integral is calculated the passenger to the acceleration information G (t) from acceleration pick-up 12, and this calculated result export to Δ S-Δ E figure detection unit 20 and Δ S-Δ V figure detection unit 23.Δ V calculating section 19 is calculated passenger's velocity variable Δ V (integrated value) by the acceleration information G (t) from acceleration pick-up 12 being carried out an interval integral, and this is calculated result export to Δ S-Δ V figure detection unit 23.

Whether Δ S-Δ E figure detection unit 20 needs to switch the first threshold switching judging of collision determination threshold value (back detailed description) based on the energy changing amount Δ E that utilizes respectively Δ E calculating section 13 and Δ S calculating section 18 to calculate and amount of movement Δ S, and this collision determination threshold value is used in the collision determination of the collision whether needs starting air bag 2 occurs.Particularly, as shown in Figure 3A, the first switching judging threshold value TH1 that relatively two dimension is set on the X-Y scheme of (the second axle) take energy changing amount Δ E as the longitudinal axis (the first axle) and take amount of movement Δ S as transverse axis, with the energy changing amount Δ E and the amount of movement Δ S that utilize Δ E calculating section 13 and Δ S calculating section 18 to calculate, judge whether need to switch collision determination threshold value described later, and with this threshold value switching judging as a result R1 export to " with " section 22.

On the X-Y scheme of Fig. 3 A, the curve table of diacritic W1 is shown in the Δ S-Δ E characteristic waveforms that occurs in fierceness collision (needing the collision of deployment balloon 2) situation that high speed offset collision etc. is accompanied by the car body distortion.Relative with it, the curve table of diacritic W2 is shown in wait for bus Δ S-Δ E characteristic waveforms in slight gentleness collision (not needing the collision of the deployment balloon 2) situation of body deformability of low speed offset collision occurs.In addition, the curve of diacritic W3 represents to occur not follow the part that is caused by slungshot etc. of car body distortion to hit Δ S-Δ E characteristic waveforms in (not needing the collision of deployment balloon 2) situation.

With reference to Fig. 3 A, be appreciated that in the slight gentleness collision of fierceness collision, the car body distortion of following car body distortion and do not follow under the part that is caused by slungshot etc. of car body distortion hits, Δ S-Δ E characteristic waveforms produces obvious difference.Therefore, as shown in Figure 3A, if the first switching judging threshold value TH1 is set as the value that to divide reliably the slight gentleness collision of fierceness collision, the car body distortion of following car body distortion and not follow the part that is caused by slungshot etc. of car body distortion to hit, when the energy changing amount Δ E that utilizes Δ E calculating section 13 and Δ S calculating section 18 to calculate and amount of movement Δ S surpass the first switching judging threshold value TH1 when R1 is for " 1 " as a result (threshold value switching judging), can judge rightly has needed the collision of deployment balloon 2 (needs switching collision determination threshold value).

The establishing method of above-mentioned the first switching judging threshold value TH1 is as follows.As previously mentioned, the voice data S (t) that obtains from sound transducer 11 has the tendency of the feature that is easy to catch car body distortion (damage), also is easy to differentiate high speed offset collision and low speed offset collision and effectively realizes rapid and correct collision determination.Fig. 3 D is when representing respectively the high speed offset collision and the figure that changes of the time of the voice data S (t) that obtains from sound transducer 11 during the low speed offset collision.

As shown in Fig. 3 D, obtain a kind of like this voice data S (t) during the high speed offset collision: approximately occur initial large peak value P1 between 10～15ms from collision generation time point (moment 0), light approximately appearance the second second largest peak value P2 between 20～30ms when collision occurs.Here, initial large peak value P1 is included in the peak value P12 that occurs during the peak value P11 that occurs during the absorption region A1 conquassation of the extension vehicle frame 111 shown in Figure 1A and absorption region A2 conquassation.On the other hand, during the low speed offset collision, initial large peak value P3 appears lighting through the about time point of 18ms left and right when collision occurs.

Be appreciated that with reference to Fig. 3 D, the peak value P3 of the voice data S (t) that the peak value P11 of the voice data S (t) that obtains during the high speed offset collision obtains during in size with the low speed offset collision is substantially identical, but the peak value P12 of the voice data S (t) that obtains during the high speed offset collision is in size fully greater than peak value P3.Here, extending the Size-dependent of the peak value P11 that produces during the absorption region A1 conquassation of vehicle frame 111 changes in collision the other side's structure, material, so adopt peak value P12 to carry out collision determination by getting rid of peak value P11, can correctly differentiate high speed offset collision and low speed offset collision.

Therefore, the part of extending along X direction of the first switching judging threshold value TH1 on X-Y scheme shown in Fig. 3 A is set to the peak value P11 shown in eliminating Fig. 3 D and can adopts peak value P12 to carry out the value of collision determination.That is to say, this part is set to the large and value below the maxim of the peak value P12 that obtains due to the absorption region A1 conquassation of extending vehicle frame 111 of maxim than the peak value P11 of the structure of having considered collision the other side, material.

In addition, due to amount of movement Δ S larger (colliding larger), the structure sound that vehicle 100 occurs is larger, so if the part of extending along X direction of the first switching judging threshold value TH1 is certain value, even if original generation does not need the collision of deployment balloon 2, also may judge by accident and be decided to be the collision that needs deployment balloon 2.Therefore, in order to prevent this misinterpretation, as shown in Figure 3A, preferably, the part along the X direction extension of the first switching judging threshold value TH1 is set as amount of movement Δ S and more increases and more uprise.

On the other hand, the voice data S (t) that obtains from sound transducer 11 comprises many parts that caused by slungshot etc. of car body distortion of not following and hits sound, so need to correctly differentiate the impulsive sound that is caused by the collision that needs deployment balloon 2 and the part that does not need deployment balloon 2 strike sound.Can utilize the acceleration information G (t) that obtains from acceleration pick-up 12 to differentiate impulsive sound that collision thus causes and hit sound by the part that slungshot etc. causes.In the situation that the impulsive sound that caused by collision occurs, produces large deceleration/decel, and occur only to produce little deceleration/decel in the situation of the part strike sound that caused by slungshot etc.

That is to say, in the X-Y scheme shown in Fig. 3 A, the part of extending along y direction of the first switching judging threshold value TH1 is set to the value that can differentiate the collision (following the fierceness collision of car body distortion) that needs deployment balloon 2 and the collision that does not need deployment balloon 2 (the part strike that is caused by slungshot etc.).In addition, large even if the change of tune is hit in the part that is caused by slungshot etc., because deceleration/decel can not have greatly changed thus, so the part of extending along y direction of the first switching judging threshold value TH1 can be set as certain value with respect to energy changing amount Δ E.

Whether Δ E1-Δ E2 figure detection unit 21 needs to switch the Second Threshold switching judging of collision determination threshold value based on first, second frequency band energy variation delta E1, the Δ E2 that utilize respectively Δ E1 calculating section 16 and Δ E2 calculating section 17 to calculate.Particularly, as shown in Fig. 3 B, relatively take the first frequency band energy variation delta E1 as transverse axis and the second switching judging threshold value TH2 that on take the second frequency band energy variation delta E2 as the X-Y scheme of the longitudinal axis, two dimension is set, with first, second frequency band energy variation delta E1, the Δ E2 that utilize Δ E1 calculating section 16 and Δ E2 calculating section 17 to calculate, judge whether need to switch collision determination threshold value described later, and with this threshold value switching judging as a result R2 export to " with " section 22.

In the X-Y scheme of Fig. 3 B, the curve table of diacritic W4 is shown in the Δ E1-Δ E2 characteristic waveforms that occurs in fierceness collision (needing the collision of deployment balloon 2) situation that high speed offset collision etc. is accompanied by the car body distortion.Relative with it, the curve table of diacritic W5 is shown in wait for bus Δ E1-Δ E2 characteristic waveforms in the situation of the slight gentleness collision (not needing the collision of deployment balloon 2) of body deformability of low speed offset collision occurs.

With reference to Fig. 3 B, be appreciated that in the fierceness collision of following the car body distortion and car body and be out of shape under slight gentleness collision, Δ E1-Δ E2 characteristic waveforms produces obvious difference.Therefore, as shown in Fig. 3 B, if the second switching judging threshold value TH2 is set as the value that to divide reliably the gentleness that fierceness is collided and the car body distortion the is slight collision of following the car body distortion, when first, second frequency band energy variation delta E1, the Δ E2 that utilize Δ E1 calculating section 16 and Δ E2 calculating section 17 to calculate surpass the second switching judging threshold value TH2 when R2 is for " 1 " as a result (threshold value switching judging), can judge rightly has needed the collision of deployment balloon 2 (needs switching collision determination threshold value).

Here, due to the decay of the high-frequency vibration of for example voiceband, the sensitivity equal error major cause of sound transducer 11, exist and knock the first frequency band energy Δ E1 of the non-collision types such as curb greater than the crash mode that needs deployment balloon 2.Yet, even if first, second frequency band energy variation delta E1, Δ E2 produce change, both change towards identical increase and decrease direction due to energy changing amount Δ E1, Δ E2, so do not affect the relation of first, second frequency band energy variation delta E1, Δ E2, it is certain that collision determination precision (whether switching the judgement precision of collision determination threshold value) keeps.

" with " section 22 based on the threshold value switching judging of Δ S-Δ E figure detection unit 20 as a result R1 and Δ E1-Δ E2 figure detection unit 21 the threshold value switching judging as a result R2 carry out finally whether needing to switch the final switching judging of collision determination threshold value, and with this final switching judging as a result R3 export to Δ S-Δ V figure detection unit 23.Particularly, " with " section 22 in the situation that the threshold value switching judging as a result R1, R2 be " 1 " final switching judging as a result R3 be set to " 1 ", and in the situation that the threshold value switching judging as a result in R1, R2 at least one for " 0 " final switching judging as a result R3 be set to " 0 ".In addition, in the situation that final switching judging as a result R3 be set to " 1 ", collision determination threshold value TH3_Hi shown in Fig. 3 C is switched to collision determination threshold value TH3_Lo, and in the situation that final switching judging as a result R3 be set to " 0 ", remain on collision determination threshold value TH3_Hi.

Δ S-Δ V figure detection unit 23 by relatively according to from " with " the final switching judging of section 22 as a result the collision determination threshold value set of R3, with the amount of movement Δ S and the velocity variable Δ V that utilize Δ S calculating section 18 and Δ V calculating section 19 to calculate, whether needed the collision determination of the collision of deployment balloon 2.Particularly, as shown in Figure 3 C, by relatively take amount of movement Δ S as transverse axis and the collision determination threshold value TH3_Hi (perhaps collision determination threshold value TH3_Lo) that on take velocity variable Δ V as the X-Y scheme of the longitudinal axis, two dimension is set, with the amount of movement Δ S and the velocity variable Δ V that utilize Δ S calculating section 18 and Δ V calculating section 19 to calculate, the collision determination that whether has needed the collision of deployment balloon 2, and with this result as the R4 output as a result of final collision determination.

More specifically, Δ S-Δ V figure detection unit 23 in the situation that final switching judging as a result R3 be " 0 " maintenance collision determination threshold value TH3_Hi, and on the other hand, in the situation that final switching judging as a result R3 for " 1 ", collision determination threshold value TH3_Hi is switched to collision determination threshold value TH3_Lo.And, in the situation that amount of movement Δ S and velocity variable Δ V surpass collision determination threshold value TH3_Hi or collision determination threshold value TH3_Lo, be judged to be the collision that needs deployment balloon 2 and collision determination as a result R4 be set to " 1 ".On the other hand, in the situation that amount of movement Δ S and velocity variable Δ V are no more than the collision determination threshold value, judge do not need deployment balloon 2 and collision determination as a result R4 be set to " 0 ".

On the X-Y scheme of Fig. 3 C, the curve table of diacritic W6 is shown in the Δ S-Δ V characteristic waveforms that occurs in fierceness collision (needing the collision of deployment balloon 2) situation that high speed offset collision etc. is accompanied by the car body distortion.Relative with it, the curve table of diacritic W7 is shown in wait for bus Δ S-Δ V characteristic waveforms in the slight gentleness of body deformability collision (not needing the collision of deployment balloon 2) situation of low speed offset collision occurs.In addition, to have represented to occur acceleration/accel in the early stage little but need Δ S-Δ V characteristic waveforms under the collision situation of deployment balloon 2 for the curve of diacritic W8.

With reference to Fig. 3 C, be appreciated that in the collision that needs deployment balloon 2 and do not need under the collision of deployment balloon 2, Δ S-Δ V characteristic waveforms produces obvious difference.Therefore, collision determination threshold value TH3_Hi can divide reliably the collision that needs deployment balloon 2 and not need the value of the collision of deployment balloon 2, and is set to the higher value that makes amount of movement Δ S and velocity variable Δ V be difficult to surpass the collision determination threshold value.On the other hand, collision determination threshold value TH3_Lo is set to the lower value that makes amount of movement Δ S and velocity variable Δ V be easy to surpass the collision determination threshold value.

Above Δ S-Δ E figure detection unit 20 and Δ E1-Δ E2 figure detection unit 21 utilize the actv. voice data S (t) of can be rapidly and correctly catching the feature of the car body distortion (damage) that is caused by frontal collision to carry out first, second threshold value switching judging.Thus, can be rapidly and judge rightly and whether follow the fierceness collision (whether needing to carry out the switching of collision determination threshold value) of car body distortion.

Utilizing above first, second threshold value switching judging, obtaining not follow in the situation of the judged result that the fierceness of car body distortion collides, reality needs the possibility of collision of deployment balloon 2 extremely low.Thereby, in the case, by the higher collision determination threshold value TH3_Hi of adopted value in the collision determination of Δ S-Δ V figure detection unit 23, can differentiate reliably the collision that needs deployment balloon 2 and the collision that does not need deployment balloon 2.

On the other hand, utilizing above first, second threshold value switching judging, obtaining to have followed in the situation of judged result of fierceness collision of car body distortion, reality needs the possibility of collision of deployment balloon 2 high.Thereby, in the case, by the lower collision determination threshold value TH3_Lo of the value of switching in the collision determination of Δ S-Δ V figure detection unit 23, air bag 2 is promptly launched.

In module in the SRS of being located at described above unit 1, the main collision determination 13～Δ S-of section Δ V figure detection unit 23 is to carry out by the arithmetic processing apparatus such as CPU that are built in SRS unit 1 software module that collision determination is realized with program.

Below, the collision determination processing that CPU carries out with program according to collision determination is described.

CPU during the power connection of SRS unit 1, be to repeat with certain cycle (for example, the cycle of hundreds of μ s) collision determination that is consisted of by following steps S1～S13 in the driving process of vehicle 100 to process.

＜step S1 〉

In case collision determination is processed beginning, at first CPU increases control variable n, then to sampling and the A/D conversion as the voice data S (t) of simulate data input with from the acceleration information G (t) of acceleration pick-up 12 as the simulate data input from sound transducer 11, thus obtain expression voice data S (t) currency digital data S (n) and represent the digital data G (n) of the currency of acceleration information G (t).Below, claim that digital data S (n) is this sub-value of voice data S (t), claim that digital data G (n) is this sub-value of acceleration information G (t).

In addition, CPU is stored in this sub-value S (n) of the voice data S (t) that obtains and this sub-value G (n) of acceleration information G (t) in the volatile memory such as RAM according to time series.That is to say, in RAM, storage was carried out till now collision determination from the past at every turn and is processed the voice data S (t) of acquisition={ S (1), ..., S (n-2), S (n-1), S (n) } and acceleration information G (t)={ G (1), ..., G (n-2), G (n-1), G (n) }.

In addition, in the situation that surpass the memory capacity of RAM, deletion in order from legacy data, and new data is stored in empty storage area gets final product.

＜step S2 〉

Then, CPU reading number bandpass filter from RAM is processed required voice data S (t), and substitution processes with in arithmetic expression by the digital band-pass filter that frequency band is set to 5kHz～15kHz, is this sub-value S1 (n) of the first frequency band voice data S1 (t) of the vibration component of 5kHz～15kHz thereby calculate as frequency band.Here, for example in the situation that bandpass filter needs this sub-value, previous value, the front previous value of voice data S (t) in processing, from RAM read S (n), S (n-1), S (n-2) gets final product.

In addition, this sub-value S1 (n) of the CPU first frequency band voice data S1 (t) that will calculate is stored in RAM by the time sequence.That is to say, in RAM storage from the past carry out till now at every turn collision determination process the first frequency band voice data S1 (t) calculate=S1 (1) ..., S1 (n-2), S1 (n-1), S1 (n).By the processing of this step S2, realize the function of an above-mentioned BPF14.

＜step S3 〉

Then, CPU reading number bandpass filter from RAM is processed required voice data S (t), and substitution processes with in arithmetic expression by the digital band-pass filter that frequency band is set to 15kHz～20kHz, is this sub-value S2 (n) of the second frequency band voice data S2 (t) of the vibration component of 15kHz～20kHz thereby calculate as frequency band.

In addition, this sub-value S2 (n) of the CPU second frequency band voice data S2 (t) that will calculate is stored in RAM by the time sequence.That is to say, in RAM storage from the past carry out till now at every turn collision determination process the second frequency band voice data S2 (t) calculate=S2 (1) ..., S2 (n-2), S2 (n-1), S2 (n).By the processing of this step S3, realize the function of above-mentioned the 2nd BPF15.

＜step S4 〉

Then, CPU reads the required voice data S (t) of calculating of energy changing amount Δ E from RAM, and an interval integral shown in following (3) formula of substitution is with in arithmetic expression, thereby calculates this sub-value Δ E (n) of energy changing amount Δ E.In addition, in following (3) formula, N is integrating range.In addition, following (3) formula is equivalent to aforesaid (2) formula.

ΔE(n)＝|S(n)|+|S(n-1)|+...+|S(n-N+1)| ...(3)

In addition, this sub-value Δ E (n) of the CPU energy changing amount Δ E that will as above calculate is stored in RAM by the time sequence.That is to say, in RAM, storage was carried out till now collision determination from the past at every turn and is processed the energy changing amount Δ E={ Δ E (1) that calculates ..., Δ E (n-2), Δ E (n-1), Δ E (n) }.By the processing of this step S4, realize the function of above-mentioned Δ E calculating section 13.

＜step S5 〉

Then, CPU reads the first required frequency band voice data S1 (t) of calculating of the first frequency band energy variation delta E1 from RAM, and an interval integral shown in following (4) formula of substitution is with in arithmetic expression, thereby calculates this sub-value Δ E1 (n) of the first frequency band energy variation delta E1.

In addition, in following (4) formula, N is integrating range.

ΔE1(n)＝|S1(n)|+|S1(n-1)|+...+|S1(n-N+1)| ...(4)

In addition, this sub-value Δ E1 (n) of the CPU first frequency band energy variation delta E1 that will as above calculate is stored in RAM by the time sequence.That is to say, in RAM, storage was carried out till now collision determination from the past at every turn and is processed the first frequency band energy variation delta E1={ Δ E1 (1) that calculates ..., Δ E1 (n-2), Δ E1 (n-1), Δ E1 (n) }.

By the processing of this step S5, realize the function of above-mentioned Δ E1 calculating section 16.

＜step S6 〉

Then, CPU reads the second required frequency band voice data S2 (t) of calculating of the second frequency band energy variation delta E2 from RAM, and an interval integral shown in following (5) formula of substitution is with in arithmetic expression, thereby calculates this sub-value Δ E2 (n) of the second frequency band energy variation delta E2.

In addition, in following (5) formula, N is integrating range.

ΔE2(n)＝|S2(n)|+|S2(n-1)|+...+|S2(n-N+1)| ...(5)

In addition, this sub-value Δ E2 (n) of the CPU second frequency band energy variation delta E2 that will as above calculate is stored in RAM by the time sequence.That is to say, in RAM, storage was carried out till now collision determination from the past at every turn and is processed the second frequency band energy variation delta E2={ Δ E2 (1) that calculates ..., Δ E2 (n-2), Δ E2 (n-1), Δ E2 (n) }.

By the processing of this step S6, realize the function of above-mentioned Δ E2 calculating section 17.

＜step S7 〉

Then, CPU from RAM reading speed variation delta V calculate required acceleration information G (t), and in the arithmetic expression used of an interval integral shown in following (6) formula of substitution, thereby calculate this sub-value Δ V (n) of velocity variable Δ V.In addition, in following (6) formula, N is integrating range.

ΔV(n)＝G(n)+G(n-1)+...+G(n-N+1) ...(6)

This sub-value Δ V (n) of the velocity variable Δ V that CPU will as above calculate is stored in RAM by the time sequence.That is to say, in RAM, storage was carried out till now collision determination from the past at every turn and is processed the velocity variable Δ V={ Δ V (1) that calculates ..., Δ V (n-2), Δ V (n-1), Δ V (n) }.By the processing of this step S7, realize the function of above-mentioned Δ V calculating section 17.

＜step S8 〉

Then, CPU reads the required acceleration information G (t) of calculating of amount of movement Δ S and carries out the secondary interval integral from RAM, thereby calculates this sub-value Δ S (n) of amount of movement Δ S.Here, the interval integral synonym of the secondary interval integral of acceleration information G (t) and velocity variable Δ V, think the processing load that alleviates CPU, preferred this sub-value Δ S (n) that adopts the arithmetic expression shown in following (7) formula to calculate amount of movement Δ S.In addition, in following (7) formula, N is integrating range.

ΔS(n)＝ΔV(n)+ΔV(n-1)+...+ΔV(n-N+1) ...(7)

This sub-value Δ S (n) of the amount of movement Δ S that CPU will as above calculate is stored in RAM by the time sequence.That is to say, in RAM, storage was carried out till now collision determination from the past at every turn and is processed the amount of movement Δ S={ Δ S (1) that calculates ..., Δ S (n-2), Δ S (n-1), Δ S (n) }.By the processing of this step S8, realize the function of above-mentioned Δ S calculating section 18.

＜step S9 〉

Then, CPU reads this sub-value Δ E (n) of energy changing amount Δ E and this sub-value Δ S (n) of amount of movement Δ S from RAM, and judges whether this Δ E (n) and Δ S (n) surpass the first switching judging threshold value TH1 shown in Fig. 3 A.If this result of determination is (being judged to be the situation of the collision that needs deployment balloon 2) in the situation of "Yes", the threshold value switching judging as a result R1 be set to " 1 ", and in the situation that result of determination is "No", the threshold value switching judging as a result R1 be set to " 0 ".By the processing of this step S9, realize the function of above-mentioned Δ S-Δ E figure detection unit 20.

＜step S10 〉

Then, CPU reads this sub-value Δ E1 (n) of the first frequency band energy variation delta E1 and this sub-value Δ E2 (n) of the second frequency band energy variation delta E2 from RAM, and judges whether this Δ E1 (n) and Δ E2 (n) surpass the second switching judging threshold value TH2 shown in Fig. 3 B.If this result of determination is (to judge the situation of the collision that has needed deployment balloon 2) in the situation of "Yes", the threshold value switching judging as a result R2 be set to " 1 ", and in the situation that result of determination is "No", the threshold value switching judging as a result R2 be set to " 0 ".By the processing of this step S10, realize the function of above-mentioned Δ E1-Δ E2 figure detection unit 21.

＜step S11 〉

Then, whether R1, R2 are all " 1 " to CPU decision threshold switching judging as a result.If this result of determination is the situation joint (judgement needs the situation of deployment balloon 2) of "Yes", final switching judging as a result R3 be set to " 1 ", and in the situation that result of determination is "No", final switching judging as a result R3 be set to " 0 ".By the processing of this step S11, realize above-mentioned " with " function of section 22.

＜step S12 〉

Then, CPU judge final switching judging as a result R3 whether be set to " 1 ".If this result of determination is in the situation of "Yes", setting lower threshold value TH3_Lo is the collision determination threshold value, and in the situation that result of determination is "No", setting higher threshold value TH3_Hi is the collision determination threshold value.

＜step S13 〉

Then, CPU judges whether this sub-value Δ V (n) of the velocity variable Δ V that reads and this sub-value Δ S (n) of amount of movement Δ S surpass the collision determination threshold value TH3_Hi (perhaps collision determination threshold value TH3_Lo) that sets in above-mentioned steps S12 from RAM.If this result of determination is (to judge the situation of the collision that has needed deployment balloon 2) in the situation of "Yes", collision determination as a result R4 be set to " 1 ", and in the situation that result of determination is "No", collision determination as a result R4 be set to " 0 ".By the processing of this step S12, S13, realize the function of above-mentioned Δ S-Δ V figure detection unit 23.

In addition, according to crash behavior, even if it is also contemplated that in this collision determination is processed final switching judging as a result R3 be set to " 1 ", but collision determination as a result R4 be not set to the situation of " 1 ".In the case, if in next collision determination is processed with final switching judging as a result R3 be reset to " 0 ", will utilize higher collision determination threshold value TH3_Hi to carry out collision determination to the situation that originally must utilize lower collision determination threshold value TH3_Lo to carry out collision determination and carry out, thereby may be difficult to promptly deployment balloon 2.Therefore, in the situation that final switching judging as a result R3 once be set to " 1 ", preferred CPU (" with " section 22) has the function that makes this state keep certain hour.

Process by the collision determination that repeats with certain cycle to be consisted of by step S1 described above～S13, by each some cycles, utilize Δ S-Δ E figure detection unit 20 implement the first threshold switching judging, utilize Δ E1-Δ E2 figure detection unit 21 implement Second Threshold switching judging, utilization " with " section 22 implements final threshold value switching judging and utilizes Δ S-Δ V figure detection unit 23 to implement collision determinations.And, in the situation that final decision needs deployment balloon 2 (in the situation that collision determination R4 be set to " 1 ") as a result, deployment balloon 2.

As described above, the SRS unit 1 of the present embodiment can be rapidly and correctly differentiate the collision (comprising the high speed offset collision in the interior fierceness collision of following the car body distortion) that needs deployment balloon 2, with the collision that does not need deployment balloon 2 (comprising the part that the low speed offset collision causes in the slight gentleness collision of interior car body distortion, by slungshot etc. hits), and regardless of the difference of the structure that collides the other side, material.In addition, by adopt the X-Y scheme shown in Fig. 3 A～3D in collision determination, can set Two Dimensional Thresholding, and can realize the raising (raising of occupant protection performance) of collision determination precision.

In addition, the invention is not restricted to above-described embodiment, can enumerate following variation.

(1) as shown in Fig. 2 B, the Δ E calculating section 13 of explanation is the structure that comprises absolute value calculating section 13a and the interval integral 13b of section in the above-described embodiments, but as shown in Fig. 2 C, Δ E calculating section 13 also can be the structure that also comprises intrinsic curve (envelope) efferent 13c except absolute value calculating section 13a and the interval integral 13b of section.This intrinsic curve efferent 13c output is from the absolute value of the voice data S (t) of absolute value calculating section 13a input | S (t) | intrinsic curve | Se (t) |.

As this intrinsic curve efferent 13c, can adopt cutoff frequency for example to be set to the low-pass filter of 400Hz.In the situation that have the structure of intrinsic curve efferent 13c, the interval integral 13b of section is by the intrinsic curve to inputting from intrinsic curve efferent 13c | Se (t) | and carry out interval integral and calculate energy changing amount Δ E.In addition, also can profit in Δ E1 calculating section 16 and Δ E2 calculating section 17 use the same method and calculate respectively first, second frequency band energy variation delta E1, Δ E2.

(2) in the SRS unit 1 shown in Fig. 2 A, also can arrange "or" (OR) section with replace " with " (AND) section 22.This "or" section is the threshold value switching judging of the Δ S-Δ E figure detection unit 20 threshold value switching judging logical OR of R2 as a result of R1 and Δ E1-Δ E2 figure detection unit 21 as a result, as final switching judging as a result R3 export to Δ S-Δ V figure detection unit 23.

(3) in the SRS unit 1 shown in Fig. 2 A, also can adopt omit a BPF14, the 2nd BPF15, Δ E1 calculating section 16, Δ E2 calculating section 17, Δ E1-Δ E2 figure detection unit 21 and " with " section 22 and with the threshold value switching judging of Δ S-Δ E figure detection unit 20 as a result R1 export to the structure of Δ S-Δ V figure detection unit 23.In the situation that adopt this structure, Δ E calculating section 13 is equivalent to the first arithmetical device of the present invention, and Δ S-Δ E figure detection unit 20 is equivalent to threshold value switching judging device of the present invention.

(4) the SRS unit shown in Fig. 2 A 1 also can adopt the easy structure shown in Fig. 4 A.SRS unit shown in Fig. 4 A is constituted as sound transducer 11, acceleration pick-up 12, Δ E calculating section 13 and the Δ V calculating section 19 that has except SRS shown in Fig. 2 A unit 1, also is provided with the first comparing section 24, threshold value selection portion 25 and the second comparing section 26.

Whether energy changing amount Δ E and switching judging threshold value Δ Eth that the first comparing section 24 is calculated by relatively utilizing Δ E calculating section 13 have needed the collision determination (threshold value switching judging) of the collision of deployment balloon 2.Here, switching judging threshold value Δ Eth is set to the value that can differentiate the collision (following the fierceness collision of car body distortion) that needs deployment balloon 2 and the collision that does not need deployment balloon 2 (the slight gentleness of car body distortion is collided).

Particularly, switching judging threshold value Δ Eth is set to the value of getting rid of the peak value P11 shown in Fig. 3 D and can having adopted the collision determination of peak value P12.That is to say, switching judging threshold value Δ Eth is set to the large and value below the maxim of the peak value P12 that obtains due to the absorption region A1 conquassation of extending vehicle frame 111 of maxim than the peak value P11 of the structure of having considered collision the other side, material.

The threshold value switching judging result selection threshold value Δ Vth_Hi of threshold value selection portion 25 foundation the first comparing sections 24 and the wherein side in threshold value Δ Vth_Lo are as the collision determination threshold value.Here, threshold value Δ Vth_Hi is set to the value that can differentiate the collision that needs deployment balloon 2 (comprise the fierceness collision of following the car body distortion, the initial stage acceleration/accel is little but need the collision etc. of deployment balloon) and the collision that does not need deployment balloon 2 (the part strike that comprise the slight gentleness collision of car body distortion, is caused by slungshot etc. etc.).In addition, threshold value Δ Vth_Lo is set to the low value than threshold value Δ Vth_Hi, with in the situation that the collision that needs deployment balloon 2 deployment balloon 2 promptly.

Whether the second comparing section 26 has needed the collision determination of the collision of deployment balloon 2 by the collision determination threshold value (threshold value Δ Vth_Hi or threshold value Δ Vth_Lo) relatively utilizing threshold value selection portion 25 and select with utilizing velocity variable Δ V that Δ V calculating section 19 is calculated.

In addition, in the structure shown in Fig. 4 A, Δ E calculating section 13 is equivalent to the first arithmetical device, and Δ V calculating section 19 is equivalent to the second arithmetical device, the first comparing section 24 is equivalent to threshold value switching judging device, and threshold value selection portion 25 and the second comparing section 26 are equivalent to collision determination device.

In the SRS unit of said structure, in the situation that the first comparing section 24 judges that energy changing amount Δ E is as below switching judging threshold value Δ Eth, select collision determination threshold value Δ Vth_Hi by threshold value selection portion 25, compare velocity variable Δ V and collision determination threshold value Δ Vth_Hi in the second comparing section 26.On the other hand, in the situation that the first comparing section 24 judges that energy changing amount Δ E surpasses switching judging threshold value Δ Eth, select collision determination threshold value Δ Vth_Lo by threshold value selection portion 25, compare velocity variable Δ V and collision determination threshold value Δ Vth_Lo by the second comparing section 26.

That is to say, at first, in the threshold value switching judging, utilize the fierceness collision of following the car body distortion to catching rapidly and correctly the feature actv. voice data S (t) of the car body distortion (damage) that is caused by frontal collision, determining whether rapidly and correctly.In the situation of judging the fierceness collision do not follow the car body distortion in this threshold value switching judging (under judging that energy changing amount Δ E is as the situation below switching judging threshold value Δ Eth), reality needs the possibility of collision of deployment balloon 2 extremely low.

Thereby, in the case, by the collision determination threshold value Δ Vth_Hi that adopted value is higher in the collision determination of the second comparing section 26, can focus on reliably to differentiate needs in the collision of deployment balloon 2 and the collision that does not need deployment balloon 2 (hit the part that is particularly caused by slungshot etc.).In this collision determination, cause to correctly catching by frontal collision the deceleration/decel actv. acceleration information G (t) that produces on car body because utilize, hit so can correctly differentiate the part that is caused by slungshot etc. that utilizes that voice data S (t) is difficult to differentiate.

On the other hand, (judge that energy changing amount Δ E surpasses in the situation of switching judging threshold value Δ Eth) in the situation of judging the fierceness collision followed the car body distortion in the threshold value switching judging, the possibility of the actual collision that needs deployment balloon 2 is high.Thereby, in the case, by the collision determination threshold value Δ Vth_Lo that the value of switching to is lower in the collision determination of the second comparing section 26, can focus on air bag 2 is promptly launched.

As described above, even according to the SRS unit of the structure shown in Fig. 4 A, also can be rapidly and correctly differentiate and need the collision of deployment balloon 2 and the collision that does not need deployment balloon 2, and regardless of the difference of the structure that collides the other side, material.

(5) the SRS unit shown in Fig. 2 A 1 also can adopt the easy structure shown in Fig. 4 B.SRS unit shown in Fig. 4 B is constituted as sound transducer 11, acceleration pick-up 12, Δ E calculating section 13 and the Δ V calculating section 19 that has except SRS shown in Fig. 2 A unit 1, also is provided with the first comparing section 27, threshold value selection portion 28 and the second comparing section 29.

Whether velocity variable Δ V and switching judging threshold value Δ Vth that the first comparing section 27 is calculated by relatively utilizing Δ V calculating section 19 have needed the collision determination (threshold value switching judging) of the collision of deployment balloon 2.Here, switching judging threshold value Δ Vth is set to and can differentiates the collision that needs deployment balloon 2 and the value that does not need the collision of deployment balloon 2.

The threshold value switching judging result selection threshold value Δ Eth_Hi of threshold value selection portion 28 foundation the first comparing sections 27 and the wherein side in threshold value Δ Eth_Lo are as the collision determination threshold value.Here, threshold value Δ Eth_Hi is set to and can differentiates the collision that needs deployment balloon 2 and the value that does not need the collision of deployment balloon 2.In addition, threshold value Δ Eth_Lo is set to the low value than threshold value Δ Eth_Hi, with in the situation that the collision that needs deployment balloon 2 deployment balloon 2 promptly.

For example, threshold value Δ Eth_Lo is set to the value of the collision determination that can adopt the peak value P12 shown in Fig. 3 D, and threshold value Δ Eth_Hi is set to the value of the collision determination that can adopt the peak value P2 shown in Fig. 3 D.That is to say, threshold value Δ Eth_Lo is set to the large and value below the maxim of the peak value P12 that obtains due to the absorption region A1 conquassation of extending vehicle frame 111 of maxim than the peak value P11 of the structure of having considered collision the other side, material.On the other hand, threshold value Δ Eth_Hi is set to the value larger than the maxim of peak value P12.

Whether the second comparing section 29 has needed the collision determination of the collision of deployment balloon 2 by the collision determination threshold value (threshold value Δ Eth_Hi or threshold value Δ Eth_Lo) of relatively utilizing 28 selections of threshold value selection portion and the energy changing amount Δ E that utilizes Δ E calculating section 13 to calculate.In addition, in the structure shown in Fig. 4 B, Δ E calculating section 13 is equivalent to the first arithmetical device, and Δ V calculating section 19 is equivalent to the second arithmetical device, the first comparing section 27 is equivalent to threshold value switching judging device, and threshold value selection portion 28 and the second comparing section 29 are equivalent to collision determination device.

In the SRS unit of said structure, in the situation that the first comparing section 27 judges that velocity variable Δ V is as below switching judging threshold value Δ Vth, select collision determination threshold value Δ Eth_Hi in threshold value selection portion 28, compare energy changing amount Δ E and collision determination threshold value Δ Eth_Hi in the second comparing section 29.On the other hand, in the situation that the first comparing section 27 judges that velocity variable Δ V surpasses switching judging threshold value Δ Vth, select collision determination threshold value Δ Eth_Lo in threshold value selection portion 28, compare energy changing amount Δ E and collision determination threshold value Δ Eth_Lo in the second comparing section 29.

That is to say, the SRS unit difference of constructing shown in the SRS unit of the structure shown in Fig. 4 B and Fig. 4 A is to carry out the threshold value switching judging and carry out final collision determination based on energy changing amount Δ E based on velocity variable Δ V.Even adopt the SRS unit of this Fig. 4 B structure, also can be rapidly and correctly differentiate and need the collision of deployment balloon 2 and the collision that does not need deployment balloon 2, and regardless of the difference of the structure that collides the other side, material.

(6) in above-described embodiment; illustration measurement bandwidth be that the vibration (structure sound) of 5kHz～20kHz is as the high-frequency vibration of voiceband; and measurement bandwidth is that the vibration of 0Hz～400Hz is as the situation of frequency band lower than the low-frequency vibration of voiceband; yet the frequency band of detected object vibration is not limited to this, can suitably set according to the structure of vehicle 100, desired occupant protection performance.That is to say, the feature (structure sound) that the frequency band of high-frequency vibration can catch the distortion (damage) of the vehicle 100 that is caused by frontal collision gets final product, and the frequency band of low-frequency vibration can catch the deceleration/decel that is caused producing on vehicle 100 by frontal collision and get final product.

In addition, in above-described embodiment, illustration to extract the first frequency band from voice data S (t) be that vibration component and the second frequency band of 5kHz～15kHz is the situation of the vibration component of 15kHz～20kHz.Yet first frequency band that should extract and the vibration component of the second frequency band also can suitably be set according to the structure of vehicle 100, desired occupant protection performance.And it is overlapping that the first frequency band and the second frequency band also can be set as both part.

Claims

1. collision determining apparatus for vehicle, it comprises:

Vibration detection device, it detects in the low-frequency vibration lower than described voiceband of the high-frequency vibration with the voiceband that produces on the vehicle that lengthens vehicle frame and frequency band, the absorption region of the impact when described lengthening vehicle frame is provided with a plurality of absorptions collision;

The first arithmetical device, it calculates the energy changing amount of described high-frequency vibration;

The second arithmetical device, it calculates the integrated value of described low-frequency vibration;

Threshold value switching judging device, it is based on described energy changing amount and the described integrated value calculated due to the arbitrary absorption region conquassation in the described a plurality of absorption regions that are located on described lengthening vehicle frame, judge whether that needs switch the collision determination threshold value, described collision determination threshold value is used in the collision determination of the collision whether needs starting device for passenger protection occurs; And

Collision determination device by described collision determination threshold value and the described integrated value of relatively setting according to the judged result of described threshold value switching judging device, carries out described collision determination.

2. collision determining apparatus for vehicle according to claim 1,

Described the second arithmetical device is calculated integrated value and the quadratic integral value of described low-frequency vibration;

Described threshold value switching judging device by relatively take the energy changing amount of described high-frequency vibration as the first axle and the first threshold of setting on take the quadratic integral value of described low-frequency vibration as the X-Y scheme of the second axle, with described energy changing amount and the described quadratic integral value of utilizing described the first arithmetical device and described the second arithmetical device to calculate, judge whether to need to switch described collision determination threshold value;

Described collision determination device by relatively take an integrated value of described low-frequency vibration as the first axle and the described collision determination threshold value of setting according to the judged result of described threshold value switching judging device on take the quadratic integral value of described low-frequency vibration as the X-Y scheme of the second axle, with a described integrated value and the described quadratic integral value of utilizing described the second arithmetical device to calculate, carry out described collision determination.

3. collision determining apparatus for vehicle according to claim 1,

Described the first arithmetical device is also calculated the energy changing amount and the energy changing amount that is included in the vibration component of the second frequency band in described high-frequency vibration of the vibration component that is included in the first frequency band in described high-frequency vibration except the energy changing amount of calculating described high-frequency vibration;

Described threshold value switching judging device comprises:

The first judgment means, its by relatively take the energy changing amount of described high-frequency vibration as the first axle and the first threshold of setting on take the quadratic integral value of described low-frequency vibration as the X-Y scheme of the second axle, with described energy changing amount and the described quadratic integral value of utilizing described the first arithmetical device and described the second arithmetical device to calculate, whether need to switch the first threshold switching judging of described collision determination threshold value;

The second judgment means, its by relatively take the energy changing amount of the vibration component of described the first frequency band as the first axle and the Second Threshold of setting on take the energy changing amount of the vibration component of described the second frequency band as the X-Y scheme of the second axle, with the energy changing amount of the vibration component of described the first frequency band that utilizes described the first arithmetical device to calculate, described the second frequency band, whether need to switch the Second Threshold switching judging of described collision determination threshold value; And

Final switching judging device, whether its judged result judgement based on described first threshold switching judging, described Second Threshold switching judging finally needs to switch described collision determination threshold value,

Described collision determination device by relatively take an integrated value of described low-frequency vibration as the first axle and the described collision determination threshold value of setting according to the judged result of described final switching judging device on take the quadratic integral value of described low-frequency vibration as the X-Y scheme of the second axle, with a described integrated value and the described quadratic integral value of utilizing described the second arithmetical device to calculate, carry out described collision determination.

4. the described collision determining apparatus for vehicle of any one according to claim 1 to 3 also has:

Measurement bandwidth is that the vibration of 5kHz～20kHz is as the first vibration sensor of described high-frequency vibration; And

Measurement bandwidth is that the vibration of 0Hz～400Hz is as the second vibration sensor of described low-frequency vibration.

5. collision determining apparatus for vehicle according to claim 4,

Described lengthening vehicle frame is that the boundary member in described absorption region is formed with rib or hole, and is arranged on the tubular vehicle frame of described front part of vehicle.

6. collision determining apparatus for vehicle according to claim 4,

Described lengthening vehicle frame is that described a plurality of absorption region is mutual different material or structures, and is arranged on the tubular vehicle frame of described front part of vehicle.

7. the described collision determining apparatus for vehicle of any one according to claim 1 to 3,

8. the described collision determining apparatus for vehicle of any one according to claim 1 to 3,