JP2000142312A - Starting control device for occupant crash protector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To start an occupant crash protector at the most suitable timing. SOLUTION: A starting control device comprises a floor sensor 32 arranged in a predetermined position within a vehicle to detect an impact added to the vehicle, and a starting control part 40 of an occupant crash protector for starting the occupant crash protector when a calculated value obtained on the basis of a detection value by the floor sensor 32 exceeds a predetermined threshold. The device further comprises satellite sensors 30A, 30B arranged forward from the floor sensor 32 in the vehicle to detect magnitude of the impact added to the vehicle and detecting at least two or more different values according to the detected magnitude of the impact, and a threshold changing part 42 for changing the predetermined threshold value according to the detection values by the satellite sensors 30A, 30B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an activation control device for an occupant protection device for controlling activation of an occupant protection device such as an airbag device for protecting an occupant in a vehicle when the vehicle collides.

[0002]

2. Description of the Related Art Conventionally, in an activation control device for controlling activation of an occupant protection device, an impact applied to a vehicle is usually detected as a deceleration by an acceleration sensor installed on a floor tunnel, and the detected deceleration is detected. A calculated value is obtained based on the calculated value, the calculated value is compared with a preset threshold value, and ignition control of the squib is performed based on the comparison result.

[0003] By the way, the type of vehicle collision depends on the type of collision,
As shown in FIG. 14, the collision is classified into head-on collision, oblique collision, pole collision, offset collision, underride collision, and the like, depending on the direction of the collision, the type of the collision target, and the like. this house,
At the time of a head-on collision, the vehicle receives an impact due to the collision by the two left and right side members, so that within a predetermined time after the collision, a large deceleration occurs on the floor tunnel to which the floor sensor is attached. On the other hand, in the case of a collision other than a head-on collision, such a shock is not received, so that a large deceleration does not occur on the floor tunnel within a predetermined time after the collision.

Accordingly, the applicant has arranged a satellite sensor at the front of the vehicle, and when the satellite sensor detects an impact equal to or greater than a reference value, lowers the threshold value to determine whether to start the occupant protection device. An application has been filed for a control device (see Japanese Patent Application Laid-Open No. 10-152014).

[0005]

However, the satellite sensor is a sensor that outputs an ON signal when an impact greater than the reference value is applied to the vehicle, and outputs a signal indicating whether or not an impact greater than the reference value is applied to the vehicle. Since only output can be performed, it is necessary to use another type of satellite sensor in order to obtain a more appropriate threshold value.

An object of the present invention is to provide a start-up control device for an occupant protection device that can start the occupant protection device at an optimum timing.

[0007]

According to a first aspect of the present invention, there is provided an occupant protection device activation control device which is disposed at a predetermined position in a vehicle and detects an impact applied to the vehicle.
An activation control unit of the occupant protection device that activates the occupant protection device when a calculation value obtained based on the detection value of the first sensor exceeds a predetermined threshold; A second sensor that is also disposed in front of the vehicle, detects a magnitude of an impact applied to the vehicle, and detects at least two or more different magnitudes according to the magnitude of the detected impact. A threshold changing means for changing the predetermined threshold value in accordance with a value detected by the second sensor, wherein the threshold changing means comprises a value based on a value detected by the second sensor. The threshold value change amount increasing means for increasing the change amount of the predetermined threshold value as the value of the threshold value increases.

According to a second aspect of the present invention, there is provided an activation control device for an occupant protection device, wherein a value based on a value detected by the second sensor of the activation control device for an occupant protection device according to the first aspect is a value of the second sensor. The detection value is obtained by integrating the detection value for a predetermined period.

According to a third aspect of the present invention, in the activation control device for an occupant protection device according to the first aspect, the threshold change amount increasing means of the activation control device for the occupant protection device is configured to increase the threshold value of the second sensor from the predetermined threshold value. It is characterized in that a value based on a calculated value obtained by integrating a detected value for a predetermined period is subtracted.

According to a fourth aspect of the present invention, there is provided an activation control device for an occupant protection device, wherein a calculated value obtained based on a value detected by the first sensor of the activation control device for an occupant protection device according to the first aspect is provided. The detection value obtained by integrating the detection value of the first sensor for a predetermined period.

According to a fifth aspect of the present invention, there is provided an activation control device for an occupant protection device according to the first aspect of the invention. The comparison with the predetermined threshold value takes a value obtained by integrating the measurement value of the first sensor on one axis for a predetermined period,
The measurement is performed on a map in which a value obtained by integrating the detection value of the first sensor is used for a period longer than the predetermined period in which the measurement value of the first sensor is integrated into another axis.

According to a sixth aspect of the present invention, there is provided an activation control device for an occupant protection device, wherein the second sensor of the occupant protection device has two sensors.
The larger of the detection values detected by the two sensors is set as the detection value by the second sensor.

According to a seventh aspect of the present invention, there is provided an activation control device for an occupant protection device, wherein one of the two sensors of the activation control device for an occupant protection device is provided on the front left side of the vehicle and the other is provided on the other side. It is provided on the front right side of the vehicle.

[0014] In the start control device for an occupant protection device according to claim 8, the second sensor of the start control device for the occupant protection device according to claim 1 is provided at a front central portion of the vehicle. It is characterized by.

According to a ninth aspect of the present invention, the second sensor of the occupant protection device of the first aspect detects the magnitude of an impact applied to the vehicle. The detection value is output as a linear value.

According to a tenth aspect of the present invention, in the activation control device for an occupant protection device, the second sensor of the activation control device for the occupant protection device detects a magnitude of an impact applied to the vehicle. It is a mechanical sensor that outputs a detection value as two different values.

According to the occupant protection device activation control device of the present invention, the threshold changing means determines the activation of the occupant protection device in accordance with the value detected by the second sensor. And the threshold change amount increasing means starts the occupant protection device at an optimal timing in order to increase the change amount of the predetermined threshold value used for determining the activation of the occupant protection device as the detection value of the second sensor increases. be able to.

According to an eleventh aspect of the present invention, in the activation control device for an occupant protection device according to any one of the first to tenth aspects, the threshold changing means of the activation control device for the occupant protection device includes the first threshold changing means. And a threshold change amount reducing unit configured to reduce a change amount of the predetermined threshold value corresponding to an initial increase state of a calculation value based on a value detected by the sensor.

According to a twelfth aspect of the present invention, there is provided an activation control device for an occupant protection device, wherein the threshold change amount reducing means of the occupant protection device activation control device according to the eleventh aspect of the present invention responds to the detection value of the second sensor. It is characterized in that the threshold change amount is reduced.

According to a thirteenth aspect of the present invention, the value obtained by calculating the detection value of the second sensor is a predetermined value. After that, the amount of change in the threshold value is reduced.

According to a fourteenth aspect of the present invention, in the activation control device for an occupant protection device according to the twelfth aspect, a value obtained by calculating a detection value of the second sensor becomes a predetermined value. It is characterized in that the threshold change amount is reduced within a predetermined period from the point in time.

According to the activation control device of the occupant protection device according to the present invention, the threshold change amount reducing means determines the predetermined value corresponding to the initial increase state of the calculated value based on the value detected by the first sensor. Therefore, it is possible to prevent the occupant protection device from being activated too quickly due to an impact or the like when traveling on a rough road.

According to a fifteenth aspect of the present invention, in the activation control device for an occupant protection device according to any one of the first to ninth aspects, the threshold value changing means of the activation control device for the occupant protection device is the second control device. When the calculation value based on the detection value of the sensor exceeds a predetermined value, the predetermined threshold value corresponding to the initial increase state of the calculation value based on the detection value by the first sensor is not changed. Features.

According to the occupant protection device activation control device of the present invention, when the calculated value based on the value detected by the second sensor exceeds a predetermined value, it is based on the value detected by the first sensor. Since the change of the predetermined threshold value corresponding to the initial increase state of the calculated value is not performed, the start time of the change of the predetermined threshold value can be delayed, and the occupant protection device is activated sensitively due to an impact or the like when traveling on a rough road. Can be prevented.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an activation control device for an occupant protection device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing an activation control device of an occupant protection device using a satellite sensor,
FIG. 2 is an explanatory diagram showing locations where the satellite sensors and floor sensors in FIG. 1 are arranged.

The activation control device of the occupant protection device is a device for controlling the activation of an airbag device 36 which is a kind of the occupant protection device. As shown in FIG. 1, the activation control device mainly includes a control circuit 20, a satellite sensor ( Second sensor) 30A,
30B, a floor sensor (first sensor) 32 and a drive circuit 34 are provided.

Of these, the satellite sensors 30A, 30
B is an electronic sensor for detecting the magnitude of the impact applied to the vehicle 46, and specifically, detects the deceleration applied to the vehicle 46 and responds to the detected magnitude of the deceleration. Outputs a detection signal. The floor sensor 32 is a so-called acceleration sensor for measuring an impact applied to the vehicle 46. Specifically, the floor sensor 32 measures a deceleration applied to the vehicle 46 in the front-rear direction at any time, and outputs the measured value. Output as a measurement signal.

The control circuit 20 includes a central processing unit (CPU)
22, a read only memory (ROM) 26, a random access memory (RAM) 28, an input / output circuit (I / O circuit) 24, and the like, and each component is connected by a bus. Of these, the CPU 22 is the ROM 2
6, various processing operations of the start control are performed. The RAM 28 stores the sensors 30A and 30A.
B and 32 are memories for storing data obtained by signals from the CPU 32 and results calculated by the CPU 22 based on the data. The I / O circuit 24 is connected to each sensor 3
This is a circuit for inputting signals from 0A, 30B and 32 and outputting a start signal to the drive circuit 34.

The CPU 22 compares a value obtained based on the measurement result of the floor sensor 32 with a predetermined threshold value in accordance with a program stored in the ROM 26 and the like, and based on the comparison result, the airbag device 36. Control unit 40 and satellite sensor 30 for controlling the start of the satellite
A and 30B function as a threshold changing unit 42 that changes the threshold according to the magnitude of the impact detected.

The drive circuit 34 operates the squib 3 in the airbag device 36 in response to an activation signal from the control circuit 20.
A circuit for energizing and igniting 8. On the other hand, the airbag device 36 includes a squib 38 as an ignition device, a gas generating agent (not shown) ignited by the squib 38, a bag (not shown) that is inflated by the generated gas, and the like. .

Of these components, the control circuit 20, the floor sensor 32 and the drive circuit 34 correspond to the ECU shown in FIG.
(Electronic control unit) 44, which is mounted on a floor tunnel substantially in the center of the vehicle 46. As shown in FIG. 2, the satellite sensors 30A and 30B are disposed in front of a vehicle 46 diagonally forward right and left diagonally forward with respect to the floor sensor 32 in the ECU 44.

Next, satellite sensors 30A and 30B, floor sensor 32 and CPU 22 in the event of a vehicle collision
Will be described. FIG. 3 shows satellite sensors 30A and 30B, floor sensor 32 and CPU 2 shown in FIG.
FIG. 4 is an explanatory diagram for describing the operation of FIG. As shown in FIG. 3, the activation control unit 40 in the CPU 22 includes a calculation unit 58 and an activation determination unit 60.

The floor sensor 32 measures the deceleration G (t) applied to the vehicle 46 in the front-rear direction as needed, and outputs the measured value (deceleration) G (t) as a measurement signal. The operation unit 58 of the activation control unit 40 performs a predetermined operation, that is, an operation according to Expressions 1 and 2 on the deceleration G (t) output from the floor sensor 32 to obtain operation values V ₁ and V ₂ . The calculated values V ₁ and V ₂ are input to the activation determination unit 60, and the calculated values V ₁ and V ₂
Value determined by V ₂ is compared with the threshold Vn of the determination map # stored by the threshold changing unit 42.

[0034]

(Equation 1)

[0035]

(Equation 2)

That is, the threshold changing unit 42 stores a determination map having a threshold Vn as shown in FIG. This determination map has a calculated value V ₁ on the horizontal axis and a calculated value V ₂ on the vertical axis. The threshold value Vn is a value of the impact applied to the vehicle 46 when the impact applied to the vehicle 46 is not enough to activate the airbag device due to a head-on collision or when the vehicle 46 is traveling on a rough road. It is set to a larger value. That is, when the threshold value Vn is determined, first, a plurality of curves indicating changes in the calculated values V ₁ and V ₂ when the airbag device 36 is not activated are drawn, and the values are larger than these curves. And a pattern that is as close to these curves as possible. Specifically, the envelopes of these curves are obtained and determined as the threshold value Vn.

The threshold changing unit 42 includes the satellite sensor 3
Detected values G ′ (t) are input from 0A and 30B,
The calculated value V ₃ is obtained by performing the operation of Expression 3 on the detected value G ′ (t), and the threshold value Vn is set to the threshold value V ′ by Expression 4.
Change to n. That is, shows the relationship between the calculated value V ₁ and the calculation value V ₃ in the graph of FIG. 5, the threshold Vn illustrated in FIG. 4, the threshold of the reduction range in accordance with the magnitude of the operation value V ₃ is determined threshold V'n
Is changed to As the detection value G '(t) of the satellite sensors 30A and 30B, the larger of the detection value of the satellite sensor 30A and the detection value of the satellite sensor 30A is used.

[0038]

(Equation 3)

[0039]

(Equation 4)

Accordingly, when the threshold value Vn is changed to the threshold value V′n based on the detection values G ′ (t) from the satellite sensors 30A and 30B, the activation determination unit 60 determines whether the threshold value get the V'n, by comparing the value determined by the calculation value V _1, V ₂ obtained by the arithmetic unit 58 with the threshold V'n, the value defined by the operation values V _1, V ₂ is the threshold
When V′n is exceeded, the start-up determination unit 60 determines whether the driving circuit 34 (see FIG.
1) is output. As a result, the drive circuit 34 energizes the squib 38 to activate the airbag device 36 and ignites the squib 38 gas generating agent (not shown).

According to the activation control device for the occupant protection device according to the first embodiment, the values determined by the calculated values V ₁ and V ₂ based on the measured value (deceleration) G (t) of the floor sensor 32. Changes as shown by the solid line 70 in FIG. 4, the airbag device 36 can be activated at the time of ignition a. That is, when performing activation determination using the threshold Vn is the airbag device 36 at the time of ignition b is to be started, the threshold V'n threshold Vn in response to the magnitude of the operation value V ₃ Therefore, the airbag device 36 can be activated at the time of ignition a earlier than the time of ignition b. Therefore, the airbag device 36 can be activated at an optimal timing according to the magnitude of the impact, that is, at an earlier timing when the impact is large.

In the first embodiment,
Satellite sensors 30A and 30B are provided on the front left and right of the vehicle.
You may provide only one.

The satellite sensors 30A and 30B in the first embodiment need only be capable of detecting two or more different values. The satellite sensors 30A and 30B linearly determine the value based on the magnitude of the applied impact. Or a mechanical sensor capable of detecting the magnitude of two different types of impact. As a sensor capable of detecting a linear value, any sensor such as an electronic type, a semiconductor type, a diaphragm type, and a capacitive type acceleration (deceleration) sensor may be used. Various load sensors for detecting may be used.

The start signal output by the start determination unit 60 may be used as a start signal for unlocking the door, cutting off the fuel, or sending an emergency call when an accident occurs. In this case, the satellite sensors 30A, 30B
Is used for the output determination of the activation signal, the reliability of the activation signal can be improved.

Next, an activation control device for an occupant protection device according to a second embodiment of the present invention will be described with reference to FIGS. The configuration of the activation control device of the occupant protection device is the same as the activation control device of the occupant protection device according to the first embodiment (see FIGS. 1 and 3), but the threshold value is changed according to the type of collision. It controls to change the amount.

FIG. 6A shows the state of the threshold changing unit 42.
In the judgment map having the stored threshold value Vn,
Based on measured value G (t) of floor sensor 32 in
Value V ₁, V_TwoThe change in the value defined by
It is a thing. FIG. 7A shows that the threshold value changing unit 42
The judgment map having the threshold value Vn stored
When running on the road, underfloor
Calculated value V based on measured value G (t) of sensor 32₁, V_TwoBy
The change in the specified value is indicated by a solid line 72.
You. Note that the judgment pattern stored in the threshold value changing unit 42 is
The map Vn is the same as the determination map Vn of the first embodiment.
And the operation value V₁And V_TwoIs the field of the first embodiment.
This is calculated using the same mathematical formula as in the case.

In the activation control device for the occupant protection system according to the second embodiment, when V ₁₂ <V ₁ , the threshold value Vn is set to the threshold value V ′ by the equation 4 as in the first embodiment.
n, and when V ₁₁ <V ₁ <V ₁₂ , the threshold Vn is changed to the threshold V′n by Expression 5 (see FIG. 6A).

[0048]

(Equation 5)

[0049] Here, the time of V ₁₂ to start the change of threshold is determined as follows. That is, FIG. 6 (b), which shows the relationship between the satellite sensors 30A, the detection value G '(t) calculation value V ₃ based on the 30B and calculation value V ₁ at the time of collision, and FIG. 7 (b) Are the satellite sensors 30A and 30B at the time of running on a rough road and at the time of an under-hit during running.
Calculation value V ₃ based on the detection value G '(t) and shows the relationship between the calculated value V _1. The calculation value V ₃ are those calculated using the same formula as in the first embodiment. In FIG. 6B and FIG. 7B, when the calculation value V ₁ at the time when the calculation value V ₃ exceeds the threshold value V _3th is V ₁₁ ,
V ₁₂ to start the change of threshold is defined as _{V 12 = V 11 + △ V} .

[0050] FIG. 6 (a), the as shown in (b), when a collision, but compared to the calculated value V ₃ rises delayed calculation value V _2, illustrated in FIG. 7 (a), (b) as, during rough road, at the time of under-hit during running, operation value V ₃ and the rising operation value V ₂ is substantially at the same time, it falls at an early time. Therefore, in the activation control device of the occupant protection device according to the second embodiment, since α ′ in Expression 5 is set to a larger value than α in Expression 4, V ₁₁ <V ₁ <V the lower width of the threshold Vn in ₁₂ can be reduced as compared with the reduction range of the threshold Vn in the V ₁₂ <V _1. Therefore, FIG.
As shown in (a), the measured value G (t) of the floor sensor 32 at the time of running on a rough road and at the time of an underhit during running.
Value determined by the calculation value V _1, V ₂ based on (solid line 7
2) does not exceed the threshold value V′n, and it is possible to prevent the airbag device 36 from being activated excessively.

In the second embodiment described above,
By setting α ′ in Equation 5 to a very large value, V ₁₁
The lowering range of the threshold value Vn at <V ₁ <V ₁₂ may be made very small (substantially zero). In this case, the effect that the airbag device 36 can be prevented from being activated too quickly can be further enhanced.

Next, an activation control device for an occupant protection device according to a third embodiment of the present invention will be described with reference to FIGS. The configuration of the activation control device of the occupant protection device is the same as the activation control device of the occupant protection device according to the first embodiment (see FIGS. 1 and 3), but the threshold value is changed according to the type of collision. The control for changing the start time is performed.

FIG. 8A shows a determination map having the threshold value Vn (V ₁ ) stored in the threshold value changing unit 42.
The change in the value determined by the calculated values V ₁ and V ₂ based on the measured value G (t) of the floor sensor 32 at the time of the collision is represented by a solid line 7.
0. FIG. 9 (a) shows a determination map having a threshold value Vn (V ₁ ) stored in the threshold value changing unit 42. The measured value G ( The change in the value determined by the calculated values V ₁ and V ₂ based on t) is indicated by a solid line 72. Note that the calculation values V ₁ and V ₂ are calculated using the same mathematical expressions as in the first embodiment.

The occupant protection system according to the third embodiment
In the startup control device,₁₁<V₁<V₁₂Then, the formula
The threshold value Vn (V₁) To a threshold V′n (V₁Change to)
You. That is, during this period, the threshold value V'n (V₁) Is the threshold value Vn
(V₁), And the threshold is not changed. Also V₁₂<V₁
Then, the threshold value Vn (V₁) To the threshold V'n
(V₁). Therefore, FIG. 8 (a) and FIG.
V as shown₁₂From the time point Vn (V₁) Threshold V ′
n (V₁) Is started. The change of the threshold is now open.
V to start ₁₂At the same time as in the second embodiment.
Is determined.

[0055]

(Equation 6)

[0056]

(Equation 7)

[0057] As shown in FIG. 8 (a), (b) , at the time of collision, calculation value V ₂ as compared to the calculated value V ₃ is but rises late, shown in FIG. 9 (a), (b) as, during rough road, at the time of under-hit during running, operation value V ₃ and the rising operation value V ₂ is substantially at the same time, it falls at an early time. Thus, the activation control device for passenger protection device according to the third embodiment, the threshold value from the time of V ₁₂ Vn
By initiating a change to the threshold V'n (V ₁₎ of the (V _1), as shown in FIG. 9 (a), when rough road, at the time of under-hit during running, the floor sensor 32 The value (solid line 72) defined by the calculated values V ₁ and V ₂ based on the measured value G (t) does not exceed the threshold value V′n, and it is possible to prevent the airbag device 36 from being activated too quickly. it can.

Next, referring to FIG. 10, a fourth embodiment of the present invention will be described.
The activation control device of the occupant protection device according to the embodiment will be described. The configuration of the activation control device of the occupant protection device is the same as the activation control device of the occupant protection device according to the first embodiment (see FIGS. 1 and 3), but the threshold value is changed according to the type of collision. The control for changing the amount is performed.

[0059] FIG. 10 (a) shows the relation between the satellite sensors 30A at symmetrical collision, the operation value V ₃ based on the detection value G '(t) of 30B and calculation value V _1, FIG. 10 (b) shows the relationship between the satellite sensors 30A during asymmetric collision, a calculation value V ₃ based on the detection value G '(t) of 30B and calculation value V _1. Note that the calculation values V ₁ and V ₃ are calculated using the same mathematical expressions as in the first embodiment.

As shown in FIG. 10A, the calculated value V _3A based on the detection value G ′ (t) of the satellite sensor 30A at the time of a left-right symmetric collision and the satellite sensor 30
The calculated value V _3B based on the detected value G ′ (t) of _B shows substantially the same waveform, but the calculated value V _3A based on the detected value G ′ (t) of the satellite sensor 30A at the time of a left-right asymmetrical collision and the satellite The value on the collision side is larger than the calculated value V _3B based on the detection value G ′ (t) of the sensor 30B.

Therefore, when the difference ΔV ₃ between the calculated values V _3A and V _3B exceeds a predetermined value, the calculated value V _3A and the calculated value V _3B are used as the calculated value V ₃ used for changing the threshold value. Use the one with the larger value. Further, α in Expression 4 for calculating the amount of change in the threshold is changed to a smaller value. Thus, the activation of the airbag device 36 can be performed accurately. When the difference ΔV ₃ between the calculated values V _3A and V _3B does not exceed a predetermined value, the calculated value V ₃ used for changing the threshold value is set to the average value of the calculated values V _3A and V _3B or the larger value. Value is used.

Next, an activation control device for an occupant protection device according to a fifth embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 11, the configuration of the activation control device of the occupant protection device is such that the threshold change unit 42 of the activation control device of the occupant protection device according to the first embodiment (see FIG. 1) is replaced by a threshold change pattern change unit. 43 by the threshold change pattern changing unit 43.
2, a threshold 80 for a head-on collision, a bad road, and a threshold 8 for an irregular collision
2 is stored.

In the activation control device for the occupant protection device, a calculation value (integral value) _VA based on the detection value G '(t) of the satellite sensor 30A and a calculation value based on the detection value G' (t) of the satellite sensor 30B. Value (integral value) V _B and
The difference between the calculated value V _A and the operation value V _B (V _A -V _B) between the calculated value V _A
If both the ratio of the calculated value _{V B (V A / V B} ) exceeds a predetermined value and, it is determined that the vehicle has an irregular collision, it switches the threshold of the determination map to the irregular crash threshold 82 .

Therefore, the activation determining unit 60 calculates the calculated value V based on the threshold value 82 for the irregular collision and the measured value of the floor sensor 32.
₁ and V ₂ are compared with the calculated values V ₁ and V ₂
When the value obtained from the above exceeds the irregular collision threshold value 82, a start signal is output to the drive circuit 34. As a result, the drive circuit 34 energizes the squib 38 to activate the airbag device 36, and ignites the gas generating agent (not shown) with the squib 38. Note that the operation values V ₁ and V ₂ are obtained by the same mathematical expressions as in the first embodiment.

According to the activation control device for the occupant protection device according to the fifth embodiment, the calculation value _VA based on the detection value G ′ (t) of the satellite sensor 30A and the detection value G ′ ( obtains a calculated value V _B based on t), because it determines that both (V _a -V _B) and (V _a / V _B) is the case of exceeding a predetermined value, the vehicle has an irregular collision Thus, it is possible to reliably determine the irregular collision of the vehicle, and it is possible to perform the optimal activation control of the occupant protection device according to the collision site of the vehicle and the type of collision of the vehicle.

The occupant according to the fifth embodiment
In the activation control device of the protection device, the satellite sensor
The calculated value V based on the detected value G '(t) of 30A_AAnd Satella
Calculated value V based on the detected value G '(t) of the light sensor 30B
_BAnd (V_A-V_B) And (V _A/ V_B) And both are specified values
If it exceeds, it is determined that the vehicle has crashed irregularly,
(V_A-V_B) And (V_A/ V_B) Is over the specified value
When the vehicle crashes, it is determined that the vehicle has crashed irregularly.
May be.

Further, in the activation control device of the occupant protection device according to the fifth embodiment, the airbag device 3
6 is determined based on whether or not the values calculated by the calculated values V ₁ and V ₂ based on the measured values of the floor sensor 32 have exceeded the threshold value of the determination map. The calculated value _VA based on the detected value G '(t) of the 30A and the detected value G' of the satellite sensor 30B
Depending on whether the calculated value obtained by the calculation value V _B based on the (t) exceeds the threshold of the determination map may be performed activation determination of the air bag device 36.

In this case, as shown in FIG. 13, the detection values of the satellite sensors 30A and 30B are input to the calculation section 58 and the integration calculation section 90. The collision mode determination unit 92 determines the collision mode based on the operation value of the integration operation unit 90, and when it is determined that the collision is irregular, the threshold change pattern changing unit 94 sets the threshold of the determination map to irregular. Switch to collision threshold.

The calculation unit 58 performs a predetermined calculation based on the detection values of the satellite sensors 30A and 30B, and the calculated value is compared with the threshold value of the determination map in the activation determination unit 60. An activation signal of the airbag device is output.

Further, in the activation control device for an occupant protection device according to the fifth embodiment, the threshold change pattern changing unit 43 uses a judgment map having a head-on collision, a bad road threshold 80 and an irregular collision threshold 82. Remember, head-on,
While switching the evil road threshold 80 and irregular collision threshold 82, the magnitude of the difference between the calculated value V _A and the operation value V _B it is not limited thereto, to determine the reduction range of the threshold value, the lower It is also possible to linearly lower the threshold 80 for frontal and rough roads by the width.

[0071]

According to the present invention, the threshold value changing means has the second
A predetermined threshold value used for determining the activation of the occupant protection device is changed according to the value detected by the sensor of the occupant protection device. Therefore, the occupant protection device can be started at an optimum timing to change the predetermined threshold value used for the start determination of the occupant.

When the threshold change amount reducing means reduces the change amount of the predetermined threshold value corresponding to the initial increase state of the calculated value based on the value detected by the first sensor, it is necessary to reduce the impact when traveling on a rough road. Accordingly, it is possible to prevent the occupant protection device from being excessively activated.

When the calculated value based on the value detected by the second sensor exceeds a predetermined value, the predetermined threshold value corresponding to the initial increase in the calculated value based on the value detected by the first sensor is changed. Is not performed, the start time of the change of the predetermined threshold value can be delayed, and it is possible to prevent the occupant protection device from being excessively activated due to an impact or the like when traveling on a rough road.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an activation control device of an occupant protection device according to a first embodiment.

FIG. 2 is an explanatory diagram showing locations of the satellite sensor and the floor sensor of the activation control device of the occupant protection device according to the first embodiment.

FIG. 3 is a satellite sensor, a floor sensor, and a CPU of the activation control device of the occupant protection device according to the first embodiment;
It is a figure for explaining operation, such as.

FIG. 4 is a diagram showing a determination map used in the activation control device of the occupant protection device according to the first embodiment.

FIG. 5 is a graph showing a detection value of a satellite sensor of the activation control device of the occupant protection device according to the first embodiment.

FIG. 6 is a diagram showing a determination map used in the activation control device of the occupant protection device according to the second embodiment, and a detection value at the time of a collision of a satellite sensor.

FIG. 7 is a diagram illustrating a determination map used in the activation control device of the occupant protection device according to the second embodiment, and a detection value of a satellite sensor when traveling on a rough road.

FIG. 8 is a diagram showing a determination map used in the activation control device of the occupant protection device according to the third embodiment, and a detection value at the time of a collision of a satellite sensor.

FIG. 9 is a diagram showing a determination map used in the activation control device of the occupant protection device according to the third embodiment, and a detection value of a satellite sensor when traveling on a rough road.

FIG. 10 is a diagram showing detection values of a satellite sensor of the activation control device of the occupant protection device according to the fourth embodiment.

FIG. 11 is a block diagram illustrating an activation control device of an occupant protection device according to a fifth embodiment.

FIG. 12 is a diagram showing a determination map used in the activation control device of the occupant protection device according to the fifth embodiment.

FIG. 13 is a block diagram showing a modification of the activation control device of the occupant protection device according to the fifth embodiment.

FIG. 14 is an explanatory diagram showing classification of collision modes of a general vehicle.

[Explanation of symbols]

Reference numeral 20: control circuit, 22: CPU, 24: I / O circuit, 2
6 ROM, 28 RAM, 30 A, 30 B satellite sensor, 32 floor sensor, 34 drive circuit, 36
... airbag device, 38 ... squib, 40 ... activation control unit, 42 ... threshold value change unit, 44 ... ECU, 46 ... vehicle.

Claims (15)

[Claims] 1. A first sensor disposed at a predetermined position in a vehicle for detecting an impact applied to the vehicle, and a calculation value obtained based on a value detected by the first sensor is a predetermined threshold value. The activation control means of the occupant protection device for activating the occupant protection device in the case of exceeding the first sensor is disposed in the vehicle ahead of the first sensor, and detects a magnitude of an impact applied to the vehicle. A second sensor that detects at least two or more different magnitudes according to the magnitude of the detected impact, and a threshold changing unit that changes the predetermined threshold according to a value detected by the second sensor. An activation control device for an occupant protection device comprising: a threshold change amount increasing unit configured to increase a change amount of the predetermined threshold value as a value based on a value detected by the second sensor increases. Specially Activation control device for passenger protection device according to. 2. The activation of the occupant protection device according to claim 1, wherein the value based on the detection value of the second sensor is obtained by integrating the detection value of the second sensor for a predetermined period. Control device. 3. The threshold change amount increasing means subtracts a value based on a calculation value obtained by integrating a detection value of the second sensor for a predetermined period from the predetermined threshold value. An activation control device for an occupant protection device according to claim 1. 4. A calculation value obtained based on a detection value of the first sensor is obtained by integrating a detection value of the first sensor for a predetermined period.
An activation control device for the occupant protection device according to the above. 5. A comparison between a calculated value obtained based on a measured value of the first sensor and the predetermined threshold value is performed by integrating a value obtained by integrating the measured value of the first sensor on a single axis for a predetermined period. Taking a value obtained by integrating the detection value of the first sensor for a period longer than the predetermined period in which the measurement value of the first sensor is integrated into another axis. The activation control device for an occupant protection device according to claim 1. 6. The apparatus according to claim 1, wherein the second sensor is composed of two sensors, and a larger one of the detected values detected by the two sensors is set as the detected value of the second sensor. Item 3. An activation control device for an occupant protection device according to Item 1. 7. The occupant protection device activation control device according to claim 6, wherein one of the two sensors is provided on a front left side of the vehicle, and the other is provided on a front right side of the vehicle. 8. The activation control device for an occupant protection device according to claim 1, wherein the second sensor is provided at a front central portion of the vehicle. 9. The activation control device for an occupant protection device according to claim 1, wherein the second sensor detects the magnitude of an impact applied to the vehicle and outputs the detected value as a linear value. . 10. The system according to claim 1, wherein the second sensor is a mechanical sensor that detects the magnitude of an impact applied to the vehicle and outputs the detected value as two different values. Activation control device for the occupant protection device. 11. The threshold value changing means includes a threshold value changing amount reducing means for reducing a changing amount of the predetermined threshold value in response to an initial increase state of a calculated value based on a value detected by the first sensor. The activation control device for an occupant protection device according to any one of claims 1 to 10, characterized in that: 12. The method according to claim 12, wherein the threshold change amount reducing unit is configured to:
The activation control device for an occupant protection device according to claim 11, wherein the threshold change amount is reduced according to a detection value of the sensor. 13. The activation control device for an occupant protection device according to claim 12, wherein a threshold change amount is reduced after a value obtained by calculating a detection value of the second sensor reaches a predetermined value. . 14. The occupant protection device according to claim 12, wherein the threshold change amount is reduced within a predetermined period after the value obtained by calculating the detection value of the second sensor has reached a predetermined value. Start control device. 15. An initial increase state of a calculated value based on a value detected by the first sensor when the calculated value based on a value detected by the second sensor exceeds a predetermined value. The activation control device for an occupant protection device according to any one of claims 1 to 14, wherein the predetermined threshold value corresponding to the following is not changed.