JP2000085523A - Starting control device for occupant protection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a starting control device for an occupant protection device, which can start the function of the occupant protection device at the proper timing based on the collision mode of a vehicle when the vehicle collides. SOLUTION: In this starting control device for an occupant protection device, which actuates the starting operation of the protection device when a value to be determined based on deceleration and the quantity of vehicle deformation, exceeds the specified threshold of a first start judging map, the device is equipped with a deceleration detecting means S10 detecting deceleration applied to a vehicle at the time of collision, operation means S13 and S14 obtaining the quantity of work received by an occupant and the work capacity of an occupant based on deceleration detected by the deceleration detecting means, a collision mode judging means S16 judging the collision mode based on the quantity of work received by an occupant and the capacity of an occupant obtained by the operation means, and with a start judging map switch means S17 making a switch from a first start judging map to a second start judging map based on the collision mode judged by the collision mode judging means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a start-up control device for an occupant protection device that accurately starts an occupant protection device when a 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. The activation of the occupant protection device is controlled based on the occupant protection device. An apparatus for controlling the activation of such an occupant protection apparatus is disclosed in Japanese Patent Application Laid-Open No. 9-998.
There is an apparatus disclosed in Japanese Patent Publication No. 03-2003. In this device, the amount of deformation of the vehicle is calculated based on the relative speed at the time of a vehicle collision obtained from the detected deceleration, and when the amount of deformation exceeds a threshold, the airbag device is activated. I have.

[0003]

However, since the deformation speed of the vehicle differs depending on the type of collision, the above-described device for activating the airbag device when the amount of deformation of the vehicle exceeds a threshold value has an accurate In some cases, it was not possible to start the airbag device at the appropriate timing.

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 appropriate timing based on the type of collision of the vehicle when the vehicle collides.

[0005]

According to a first aspect of the present invention, there is provided an occupant protection device activation control device, wherein a value determined by a deceleration and a vehicle deformation amount exceeds a predetermined threshold value of a first activation determination map. In the start-up control device of the occupant protection device that starts the occupant protection device, deceleration detection means for detecting a deceleration acting on the vehicle at the time of collision, and an occupant based on the deceleration detected by the deceleration detection means Calculating means for determining the amount of work to be received and the work capacity of the occupant; collision type determining means for determining a collision form of the vehicle based on the work amount to be received by the occupant and the work capacity of the occupant obtained by the calculating means; Based on the collision type determined by the collision type determination means, the first activation determination map is
And a startup determination map switching means for switching to the startup determination map.

According to the activation control device for an occupant protection device of the present invention, the collision type is determined by the collision type determining means based on the work amount received by the occupant and the occupant's work capacity. Can be performed accurately,
Based on the collision mode, the first
Is switched to the second activation determination map, the switching to the activation determination map can be accurately performed.

According to a second aspect of the present invention, there is provided an activation control device for an occupant protection device. When it is determined that the collision is low, the first activation determination map is switched to the second activation determination map.

According to the start control device of the occupant protection device, the first start determination map is switched to the second start determination map when it is determined that the collision has low rigidity. Also, even when the rigidity of the collision target is low, the occupant protection device can be activated at an early stage.

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 work received by the occupant and the occupant's load obtained by the calculation means are determined. A relative speed calculating means for obtaining a relative speed at the time of the collision of the vehicle based on a work capacity; and a vehicle deformation amount calculating means for obtaining the vehicle deformation amount based on the relative speed calculated by the relative speed calculating means. It is characterized by the following.

According to the start control device of the occupant protection device according to the third aspect, the relative speed at the time of collision of the vehicle is determined based on the work amount received by the occupant and the occupant's work capacity, and the vehicle is determined based on the relative speed. Since the amount of deformation is obtained, the amount of vehicle deformation can be accurately obtained.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing an activation control device for an occupant protection device according to an embodiment of the present invention.

The activation control device for 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. A drive circuit 34 is provided.

The floor sensor 32 is a so-called acceleration sensor for detecting an impact applied to the vehicle. More specifically, the floor sensor 32 detects a deceleration applied to the vehicle in the front-rear direction at any time, and detects the deceleration. The value is output as a detection signal.

The control circuit 20 includes a central processing unit (CPU)
22, an input / output circuit (I / O circuit) 24, a read only memory (ROM) 26, a random access memory (RAM) 28, and the like, and each component is connected by a bus. Among them, the CPU 22 performs various processes such as activation control of the airbag device according to a program or the like stored in the ROM 26. The RAM 28 is a memory for storing data obtained by signals from the floor sensor 32, results calculated by the CPU 22 based on the data, and the like. Also, the I / O circuit 24 is a floor sensor 3
2 and a circuit for outputting a start signal to the drive circuit 34.

The drive circuit 34 starts 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. 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) expanded by generated gas, and the like. . Among these components, the control circuit 20, the floor sensor 32, and the drive circuit 34 are housed in an ECU (Electronic Control Unit) and mounted on a floor tunnel substantially in the center of the vehicle.

Next, the activation control of the airbag device 36 at the time of a vehicle collision will be described. Floor sensor 32
Detects the deceleration applied to the vehicle in the front-rear direction as needed, and outputs the detected value to the control circuit 20 as a detection signal.

When the CPU 22 of the control circuit 20 captures the detected value output from the floor sensor 32 via the I / O circuit 24, the CPU 22 removes a vibration component from the detected value using a Kalman filter (step S10). Then, the deceleration G (t) from which the vibration component has been removed is sequentially stored in the RAM 28 (waveform memory) (step S11).

If the deceleration G (t) does not exceed 2 g (gravitational acceleration), the CPU 22 proceeds to steps S10 to S10.
Step S12 is repeated. On the other hand, deceleration G
When (t) is equal to or greater than 2 g (gravity acceleration), the occupant movement amount s (t) is calculated based on Equation 1, and the state of the change in the value determined by G (t) and s (t) is calculated. (See FIG. 3A).

[0019]

(Equation 1)

Further, the work amount received by the occupant is calculated by calculating P (t) based on Equation 2, and the state of a change in the value determined by P (t) and s (t) is obtained (FIG. 3 (b)). Reference, step S13). In addition, when considering a fixed section Δs, P (t) appears in a hatched area in FIG.

[0021]

(Equation 2)

Next, the work capacity C (t) of the occupant is calculated based on Equation 3, and the state of a change in the value determined by C (t) and s (t) is obtained (see FIG. 3 (c)). , Step S14).

[0023]

(Equation 3)

Then, it waits until t _min (the minimum value after the first maximum value after the collision occurs) is detected for P (t), and after detecting t _min , refer to the CP map shown in FIG. The collision type is determined (step S15). That is, P
The first local maximum value after the occurrence of the collision of (t) and the value determined by the corresponding value of C (t) (the first maximum value after the occurrence of the collision) correspond to the position on the CP map where the frontal collision occurs. , ORB collision (collision when the stiffness of the collision target is high), ODB collision (collision when the stiffness of the collision target is low), bad road, or low-speed collision. Here OD
If it is determined that the collision is B (step S16), the collision determination map is changed from the R map (first activation determination map) to D.
The map is switched to the map (second startup determination map) (step S17).

Next, the relative speed V ₀ ′ is obtained based on the mathematical formula 4 (step S 18), and the vehicle deformation amount S ′ (t) is obtained.
Is calculated based on Equation 5 (Step S19).

[0026]

(Equation 4)

[0027]

(Equation 5)

Then, using the D map, the airbag device 3
6 is determined (step S20). That is, the start determination based on the D map is performed by determining G (t) and S ′ as shown in FIG.
The determination is made based on whether or not the value determined by (t) exceeds the threshold value 50. When the value exceeds the threshold value 50, it is determined to be activated. Here, in the case of an ODB collision, since the value determined by G (t) and S '(t) rises significantly in the late stage of the collision, the activation (deployment) of the airbag device 36 is determined during the large rise. be able to.

In step S16, O
RB collision (collision when the rigidity of the collision target is high) or
If it is determined that the vehicle is in the head-on collision, the relative speed V ₀ is obtained based on the formula 6 (step S21), and the vehicle deformation amount S
(T) is calculated based on Equation 7 (Step S22).

[0030]

(Equation 6)

[0031]

(Equation 7)

Next, it is determined whether or not it is necessary to switch the activation determination map from the R map to the D map (step S23). That is, in the CP map shown in FIG.
In step S16, the boundary between the B collision and the ODB collision (the portion indicated by hatching in FIG. 4) is
Although the collision is determined, the value of S (t) rebounds (when the value of S (t) increases and starts to decrease), and G
If it is detected that the value of (t) is equal to or greater than the predetermined threshold _Gth , the activation determination map is switched from the R map to the D map (step S17), and the airbag device 36 is used by using the D map. (Steps S18 to S
20). Thus, even in the case of a boundary portion between the ORB collision and the ODB collision, that is, in the case of a collision in which it is difficult to determine the type of collision, the airbag device 36 can be started accurately.

On the other hand, if it is determined in step S23 that the switching of the activation determination map is not necessary, the activation of the airbag device 36 is determined using the R map (step S24). That is, the start determination based on the R map is performed based on whether or not the value defined by G (t) and S (t) exceeds the threshold value 52 as shown in FIG. Is determined to be activated.

If it is determined in step S16 that the collision is a low-speed collision (collision at a vehicle speed of 20 km / h or less) or a bad road (when the deceleration exceeds 2 g due to vibration due to running on a bad road), the flow proceeds to step S16. Return to S10 and step S10
Continue the subsequent processing.

In steps S20 and S24 described above,
When the activation of the airbag device 36 is determined (step S25), the process proceeds to step S26, and the CPU 2
2 outputs a start signal 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.

Therefore, according to the activation control device of the occupant protection device according to this embodiment, when the rigidity of the object colliding with the vehicle is low, the collision determination map is changed from the R map to the D map.
Since the map is switched, the airbag device can be activated early even when the rigidity of the collision target is low.

[0037]

According to the first aspect of the present invention, the collision type is accurately determined by the collision type determining means for determining the collision type of the vehicle based on the amount of work received by the occupant and the occupant's work capacity. The first determination map is switched to the second determination map based on the collision mode by the determination map switching means, so that the switching to the determination map can be accurately performed. Therefore, the occupant can be reliably restrained in the event of a vehicle collision.

According to the second aspect of the invention, when it is determined that the collision of the collision object has low rigidity, the first activation determination map is switched to the second activation determination map. Even when the rigidity is low, the occupant protection device can be activated at an early stage.

According to the third aspect of the present invention, the relative speed at the time of collision of the vehicle is obtained based on the work amount received by the occupant and the work capacity of the occupant, and the vehicle deformation amount is obtained based on the relative speed. The vehicle deformation amount can be accurately obtained.

[Brief description of the drawings]

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

FIG. 2 is a flowchart for explaining processing in an activation control device of the occupant protection device according to the embodiment of the present invention;

FIG. 3 is a graph showing a relationship between calculated values obtained by the activation control device of the occupant protection device according to the embodiment of the present invention.

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

FIG. 5 is a diagram for explaining a start determination using a D map in the start control device of the occupant protection device according to the embodiment of the present invention;

FIG. 6 is a diagram for explaining a start determination using an R map in the start control device of the occupant protection device according to the embodiment of the present invention;

[Explanation of symbols]

Reference numeral 20: control circuit, 22: CPU, 24: I / O circuit, 2
6 ROM, 28 RAM, 32 Floor sensor, 34
... drive circuit, 36 ... airbag device, 38 ... squib.

Claims (3)

[Claims] An activation control device for an occupant protection device that activates an occupant protection device when a value defined by a deceleration and a vehicle deformation amount exceeds a predetermined threshold value of a first activation determination map. A deceleration detecting means for detecting a deceleration acting on the vehicle at the time; a calculating means for obtaining a work amount received by the occupant and a work capacity of the occupant based on the deceleration detected by the deceleration detecting means; Collision type determination means for determining a collision type of the vehicle based on the obtained work amount received by the occupant and the work capacity of the occupant; and the first collision type based on the collision type determined by the collision type determination means. And a start determination map switching means for switching the start determination map to the second start determination map. 2. The start-up determination map switching means, when the collision type determination means determines that the collision of the collision target has a low rigidity, causes the first start-up determination map to be the second start-up determination map.
2. The method according to claim 1, further comprising:
An activation control device for the occupant protection device according to the above. 3. A relative speed calculating means for obtaining a relative speed at the time of a collision of the vehicle based on a work amount received by the occupant and a work capacity of the occupant obtained by the calculating means; 2. The activation control device for an occupant protection device according to claim 1, further comprising: a vehicle deformation amount calculating unit that calculates the vehicle deformation amount based on the calculated relative speed.