JP2008114727A - Adjustable collision trigger device and method - Google Patents

Abstract

An adjustable collision trigger device and method thereof are provided.
The present invention relates to an adjustable crash trigger device and method thereof, and the adjustable crash trigger device of the present invention includes a power supply module, an electronic acceleration sensor module, and a microcomputer control module. The microcomputer control module includes at least an immediate processing unit and a beacon operation command unit. Whether or not the moving object collides is determined mainly by the above-described apparatus and other methods. When it is determined that the collision occurs, the emergency launching device is activated to position the moving object. The apparatus of the present invention is electronic, and can perform three-axis determination at the same time. The critical acceleration value is adjusted based on the form of the moving object to achieve high sensitivity, low false alarm rate, and low failure efficiency of the device of the present invention.
[Selection] Figure 1

Description

  The present invention relates to a collision trigger apparatus and method, and more particularly to an adjustable collision trigger apparatus and method. Whether the moving object achieves the collision condition or not is determined by the electronic system and the three-axis direction, and is used for transportation means of land, sea and air.

  Currently employed collision trigger devices are safety airbags and mechanical trigger devices. However, the collision trigger device is placed on an automobile, and acceleration values in the front-rear direction, the left-right direction, and the up-down direction in general traveling do not exceed 1G. The acceleration value generated at the moment of high-speed collision is also between 1G and 2G at the maximum. In addition, a general collision trigger device usually determines a moving collision trigger using only two axial directions at most. However, since this collision trigger device is applied only for general purposes, it cannot be applied to the determination of the collision trigger state of each type of air flight means. Therefore, when the current collision trigger device is applied to air flight means, it often causes false alarm or failure, and it is further impossible to apply it on each type of fighter aircraft.

  Although the above-described conventional technique can achieve the determination of the collision trigger of a general transportation means, it cannot be applied to an air flight means. Moreover, the collision trigger device is mechanical and can only determine in two axes. And the critical acceleration value cannot be adjusted, so that the conventional one cannot meet the needs when the user actually uses it.

  The main object of the present invention is to provide an adjustable collision trigger device and method thereof, which can be used for land, sea and air transportation, can determine triaxial directions, can adjust its critical acceleration value, and has high sensitivity. To achieve low false alarms and low inefficiencies.

  In order to achieve the above object, the adjustable collision trigger device and method of the present invention include an electric power supply module, an electronic acceleration sensor module, an electric power supply module, and an electronic device. Includes one microcomputer control module for the acceleration sensor module. Among them, the microcomputer control module includes at least one immediate processing unit and one beacon operation command unit.

  In the adjustable collision trigger method, first, an acceleration value of at least one axis of a moving object is measured, and further, it is determined whether or not the moving object achieves a collision condition. If the moving object achieves a collision condition, a trigger warning signal is transmitted to the emergency launcher and at the same time positioning is performed for the moving object.

  The method for determining whether or not the moving object achieves the collision condition is to first capture at least a uniaxial acceleration value, calculate the resultant acceleration value, and determine that the resultant acceleration value is greater than the critical acceleration value. In this case, the amount of change in the combined speed is calculated, and when it is determined that the amount of change in the combined speed is greater than the minimum amount of change in speed, it means that the collision condition is reached, and a trigger warning signal is transmitted.

The invention of claim 1 includes a power supply module, an electronic acceleration sensor module, and a microcomputer control module.
The power supply module provides power and the electronic acceleration sensor module measures at least one axis acceleration value of the moving object;
The microcomputer control module is connected to the power supply module, and includes at least an immediate processing unit and a beacon operation command unit,
The immediate processing unit receives at least one-axis acceleration value measured by the electronic acceleration sensor module, determines whether the moving object achieves a collision condition and transmits one driving signal;
The beacon activation command unit is an adjustable collision trigger device that receives a drive signal transmitted by the immediate processing unit, is simultaneously activated by the drive signal, and transmits one trigger warning signal.
The invention according to claim 2 is characterized in that the time for determining whether or not the immediate processing unit achieves the collision condition of the moving object is between 1 ms and 50 ms. It is said.
The invention according to claim 3 is characterized in that one critical acceleration value and one minimum speed change amount of the immediate processing unit are preset, and it is determined whether or not the moving object achieves the collision condition. It is the adjustable collision trigger device described.
The invention according to claim 4 is characterized in that the critical acceleration value is adjusted based on the form of the moving object and is adjusted for the immediate processing unit by a computer program. It is said.
The invention of claim 5 is a method for determining whether or not the moving object reaches a collision condition of the immediate processing unit.
Capture the acceleration value of at least one axis of the moving object measured by the electronic acceleration sensor module,
Calculate the combined acceleration value of the moving object,
Judge that the combined acceleration value is larger than the critical acceleration value,
Calculate the amount of change in the composite speed of the moving object, and
2. The adjustable collision trigger device according to claim 1, wherein it is determined that the combined speed change amount is larger than the minimum speed change amount.
The invention according to claim 6 is characterized in that the combined acceleration value is the square root of the added value obtained by adding the acceleration values of the respective axes to the square, and adjusting the resultant acceleration value. It is said.
The invention according to claim 7 is characterized in that the combined speed change amount is summed by squaring the speed change amount of each axis, and is the square root of the obtained addition value. It is a trigger device.
The invention according to claim 8 is characterized in that when the resultant acceleration value is smaller than the critical acceleration value, the acceleration value of at least one axis of the moving object is further captured and judged again. It is a trigger device.
The invention according to claim 9 is characterized in that when the composite speed change amount is smaller than the minimum speed change amount, the acceleration value of at least one axis of the moving object is captured again and determined. It is a collision trigger device.
The invention according to claim 10 is the adjustable collision trigger device according to claim 1, wherein the trigger warning signal is transmitted to the emergency launch device.
The invention according to claim 11 is the adjustable collision trigger device according to claim 10, characterized in that the emergency launch device can be an emergency emergency locator transmitter (ELT).
The invention according to claim 12 is the adjustable collision trigger device according to claim 1, wherein the power supply module can be a rechargeable battery.
According to a thirteenth aspect of the present invention, there is provided an adjustable collision trigger device according to the first aspect, wherein the moving object can be a land, sea and air transportation means.
The invention according to claim 14 is characterized in that the microcomputer control module further includes a self-check unit, and the self-check unit tests whether or not the adjustable collision trigger device is normal. The adjustable collision trigger device according to claim 1, wherein the self-check unit receives a signal from the emergency launch device and performs a self-check. This is an adjustable collision trigger device.
16. The adjustable collision trigger device according to claim 14, wherein the self-check unit can issue a warning message when it reconnaissance that a failure has occurred in the adjustable collision trigger device. It is said.
The invention according to claim 17 is the adjustable collision trigger device according to claim 16, wherein the warning message is voice or light.
The invention according to claim 18 is characterized in that the microcomputer control module further includes a reset unit, and the reset unit receives a signal from the emergency launch device and resets the microcomputer control module. The adjustable collision trigger device according to Item 1 is used.
The invention of claim 19 measures an acceleration value of at least one axis of a moving object,
Determine if the moving object achieves the collision condition,
And it is set as the method of the adjustable collision trigger characterized by transmitting a trigger warning signal.
The twentieth aspect of the invention is the adjustable collision trigger method according to the twentieth aspect, wherein when the moving object does not achieve the collision condition, the acceleration value of at least one axis of the moving object is measured again.
The invention of claim 21 includes the following methods for determining whether or not the moving object achieves the collision condition:
Capture at least one axis acceleration value of moving objects,
Calculate the resultant acceleration value,
Judge that the combined acceleration value is larger than the critical acceleration value,
Calculate the amount of change in the synthesis speed of the moving object,
21. The adjustable collision trigger method according to claim 20, wherein it is determined that the combined speed change amount is larger than the minimum speed change amount.
The invention according to claim 22 is characterized in that, when it is determined that the resultant acceleration value is smaller than the critical acceleration value, the determination is performed by capturing again the acceleration value of at least one axis of the moving object. It is an adjustable collision trigger method.
The invention according to claim 23 is characterized in that, when the combined speed change amount is smaller than the minimum speed change amount, at least one axis acceleration value of the moving object is captured again to make a determination. This is a type of collision trigger method.
According to a twenty-fourth aspect of the present invention, there is provided the adjustable collision trigger according to the twenty-first aspect, wherein the resultant acceleration is added to the square of at least one axis acceleration value, and further obtained as the square root of the obtained added value. It's a way.
The invention according to claim 25 is characterized in that the combined speed change amount is obtained by adding at least the square of the uniaxial speed change amount and obtaining the square root of the obtained addition value. It is a collision trigger method.

  The adjustable collision trigger device and method of the present invention effectively improve various conventional drawbacks and can be used for land, sea and air transportation. The apparatus of the present invention is electronic and can determine three axes, and the critical acceleration value can be adjusted according to the form of the moving object. In this way, high sensibility, low false alarm rate, and low inefficiency are achieved, and the production capacity of the present invention is further advanced to be more practical and more suitable for user needs.

  Reference is made to FIG. 1 showing the structure of the adjustable crash trigger device of the present invention. As shown in the figure, the present invention is an adjustable crash trigger device and a method thereof, and the adjustable crash trigger device 1 includes one power supply module 11, one electronic acceleration sensor module 12, and the power supply module 11. And one microcomputer control module 13 connected to the electronic acceleration sensor module 12. Among them, the microcomputer control module 13 includes at least one immediate processing unit 131 and one beacon operation command unit 132.

  The adjustable collision trigger device 1 of the present invention first uses the electronic acceleration sensor module 12 to measure the acceleration value of each axis (x axis, y axis, and z axis) of the moving object, and simultaneously The acceleration value of the axis is transmitted to the immediate processing unit 131 of the microcomputer control module 13.

  The immediate processing unit 131 can preset one critical acceleration value and one minimum speed change amount, and the critical acceleration value is determined according to the form of the moving object. For example, when the moving object is a land transportation means (for example, an automobile), the critical acceleration value can be set between 0.5G and 2G. If the moving object is an air flight means (for example, airplane, fighter), the critical acceleration value can be set between 2G and 3G, and the critical acceleration value is adjusted to the immediate processing unit 131 by a computer program. It can be performed.

  Then, the immediate processing unit 131 can determine whether the moving object achieves the collision condition. The time for determining whether the moving object of the immediate processing unit 131 achieves the collision condition is between 1 ms and 50 ms. The determination method first receives at least one axis acceleration value of the moving object measured by the electronic acceleration sensor module 12. For example, when judging only in the single axis direction, the acceleration value of the axis measured by the electronic acceleration sensor module 12 is compared with the critical acceleration value, and when the acceleration value is larger than the critical acceleration value, the moving object It is determined whether the speed change amount is larger than the minimum speed change amount. When the speed change amount is larger than the minimum speed change amount, the beacon operation command unit 132 is activated.

  The adjustable collision trigger device 1 of the present invention can determine in three axial directions, so that the immediate processing unit 131 receives the acceleration value of each axis measured by the electronic acceleration sensor module 12. However, the acceleration values of each axis must first be combined into a composite acceleration value, then the composite acceleration value is compared with the critical acceleration value, and when the composite acceleration value is greater than the critical acceleration value, It is determined whether the combined speed change amount of the moving object is larger than the minimum speed change amount. Then, the combined speed change amount is obtained by combining the speed change amounts of the respective axes. When the combined speed change amount is larger than the minimum speed change amount, the beacon operation command unit 132 is activated.

  When the immediate processing unit 131 determines that the moving object collides in the future, the beacon operation command unit 132 is activated. The beacon activation command unit 132 can transmit one trigger warning signal to the emergency launching device 2, and the emergency launching device 2 can be an emergency emergency positioning signal emitter (ELT).

  Reference is made to FIG. 2, which shows the structure of an embodiment of the present invention. As shown in the figure, the present invention is an adjustable crash trigger device and a method thereof, and the adjustable crash trigger device of this embodiment includes at least one power supply module 11, one electronic acceleration sensor module 12, and an instant. One microcomputer control module 13 having a processing unit 131 and a beacon operation command unit 132 is included. However, in order to prevent the situation where the adjustable collision trigger device 1 fails and cannot be used and the user is in danger, the microcomputer control module 13 includes one self-check unit 133 and a reset unit 134. Is added.

  Then, the self-check unit 133 receives the signal of the emergency launch device 2 and performs self-check, performs internal transmission and external output reconnaissance for the adjustable collision trigger device 1, and adjusts the collision trigger device. Determine whether 1 is normal. Each time the self-check is performed, the beacon operation command unit 132 is activated, and the beacon operation command unit 132 transmits one trigger warning signal to the emergency launch device 2. At this time, the beacon operation command unit 132 is set to logic 1. Therefore, it is necessary to reset, and this reset operation proceeds when the reset unit 134 receives the signal of the emergency launcher 2.

  If the self-check unit 133 finds that there is a failure when performing the check, the self-check unit 133 issues a warning message, and the warning message can be voice or light.

  In this embodiment, the power supply module 11 is one rechargeable battery (lithium battery), the power supply module 11 is connected to the microcomputer control module 13, and the microcomputer control module 13 is also connected to the electronic acceleration sensor module 11. The electronic acceleration sensor module 11 measures the acceleration value of at least one axis of the moving object and transmits it to the immediate processing unit 131 of the microcomputer control module 13 to determine whether the moving object causes a collision. If it is determined that a collision occurs, the beacon operation command unit 132 is activated, and a trigger warning signal is transmitted to the emergency launching device 2.

3 and 4 are a flowchart of the adjustable collision trigger method of the present invention and a flowchart for determining whether or not the collision condition of the present invention is achieved. As shown in the figure, the present invention is a kind of adjustable collision trigger method, which includes the following steps:
Step 31: Measure the acceleration value of at least one axis of the moving object.
Step 32: Determine whether the moving object achieves the collision condition,
Step 321: When the moving object achieves the collision condition, go to Step 33.
Step 322: When the moving object does not achieve the collision condition, proceed to Step 31.
Step 33: A trigger warning signal is transmitted.

The above is a method for determining whether the moving object achieves the collision condition, and includes the following steps.
Step 34: Capture at least one axis acceleration value of the moving object,
Step 35: Calculate the resultant acceleration value. For example, step 34 captures an acceleration value of only one axis (X axis, Y axis, or Z axis) and sets the acceleration value as the combined acceleration value. In step 34, the acceleration values of the three axes (X axis, Y axis, and Z axis) are captured. Therefore, the resultant acceleration value is obtained by adding the squares of the acceleration values of the respective axes, and further obtaining the added value. The square root of
Step 36: It is determined whether the resultant acceleration value is larger than the critical acceleration value, and the critical acceleration value is adjusted according to the shape of the moving object.
Step 361: When the resultant acceleration value is larger than the critical acceleration value, the process proceeds to Step 37.
Step 362: When the resultant acceleration value is smaller than the critical acceleration value, the process returns to Step 34.
Step 37: The amount of change in the combined speed of the moving object is calculated. For example, a speed change amount of only one axis (X axis, Y axis, or Z axis) is captured, and the speed change amount is set as the combined speed change amount. And when capturing the speed change amount of three axes (X axis, Y axis, and Z axis), the combined speed change amount is the sum of the squares of the speed change amount of each axis, and the obtained additional value The square root of
Step 38: It is determined whether or not the combined speed change amount is larger than the minimum speed change amount.
Step 381: When it is determined that the combined speed change amount is larger than the minimum speed change amount, the process proceeds to Step 39.
Step 382: When it is determined that the combined speed change amount is smaller than the minimum speed change amount, the process returns to Step 34.
Step 39: The moving object achieves the collision condition.

  FIG. 5 is a collision response curve diagram of the present invention. As shown in the figure, it includes one reference curve 41, one first curve 42, and one second curve 43, and as can be seen from the reference curve 41, its critical acceleration value is about 14G, and its minimum speed is The amount of change is 1.4 m / s.

  Since the first start acceleration value of the first curve 42 is larger than 14G and the first speed change amount is 1.52 m / s, the first start acceleration value is larger than the critical acceleration value of the reference curve 42. The first speed change amount is larger than the minimum speed change amount. Therefore, under this state, the adjustable collision trigger device 2 transmits one trigger warning signal to the emergency launch device.

  Since the second start acceleration value of the second curve 43 is smaller than 14 G and the second speed change amount is 1.22 m / s, the second start acceleration value is larger than the critical acceleration value of the reference curve 41. The second speed change amount is larger than the minimum speed change amount. Therefore, under this condition, the adjustable collision trigger device does not activate the emergency launch device.

  FIG. 6 shows a relationship between speed and time of the adjustable collision trigger device of the present invention. As shown, the first relation curve 51, the second relation curve 52, the third relation curve 53, the fourth relation curve 54, and the fifth relation curve 55 are included. The relationship curve 51 is used as a reference. As can be seen from the first relationship curve 51, the critical acceleration value is 2.3G, and the acceleration values of the second relationship curve 52 and the third relationship curve 53 are 10G and 4G, respectively. The value is greater than the critical acceleration value. The acceleration values of the fourth relationship curve 54 and the fifth relationship curve 55 are 1.5 G and 0.5 G, respectively, and the above two acceleration values are smaller than their critical acceleration values. Further, as can be seen from the degree of the curve inclination, the speed change amount of the second relationship curve 52 is the maximum, and the speed change amount of the fifth relationship curve 55 is the minimum. Therefore, the adjustable collision trigger device activates the emergency launch device under the state of the second relationship curve 52 and the third relationship curve 53. Conversely, the adjustable collision trigger device need not activate the emergency launch device under the condition of the fourth relationship curve 54 and the fifth relationship curve 55.

  7, 8, and 9 are x-axis acceleration curve, y-axis acceleration curve, and z-axis acceleration curve diagram of the present invention, respectively. As shown in the figure, when performing a drop experiment with the collision trigger device of the present invention, the above curve diagrams show one x-axis acceleration curve 61, one y-axis acceleration curve 62, and one z-axis acceleration curve 63, respectively. In addition, as can be seen from the acceleration curve of each axis, when the collision trigger device is stationary, an acceleration value of 1 G is generated only on the y axis. This is because the y-axis of the adjustable collision trigger device faces the ground, and the resultant acceleration value at this time is 1G. When the adjustable collision trigger device is released, the acceleration values cannot be reconnaissance in any of the three axis directions. Next, when the adjustable collision trigger device falls and collides with the ground, each axis captures its acceleration value. It can be seen that two large acceleration changes occurred at the same time, one for the moment of falling and just hitting the ground, and one for the rolling impact after the collision. Subsequently, the rest is restored. However, as can be seen from the z-axis acceleration curve 63, an acceleration value of 1G is generated on the z-axis of the adjustable collision trigger device, which is the impact of the adjustable collision trigger device after the 90 degree roll, This is because the z axis faces the ground.

  See the composite acceleration curve diagram of the present invention shown in FIG. As shown in the figure, the drop experiment of the adjustable collision trigger device of the present invention explains the change in acceleration of each axis. In order to determine whether or not the collision trigger condition has been reached, as described above, the acceleration change of each axis must be combined into a combined acceleration. This figure shows the combined acceleration curve 7 by combining the acceleration curves of the above-mentioned axes. As can be seen from the combined acceleration curve 7, the duration of the first impact peak is 0.03 seconds. The length of time that the acceleration value exceeds 2G is also about 0.03 seconds.

It is a structural diagram of the adjustable collision trigger device of the present invention. 1 is a structural diagram of an embodiment of the present invention. 3 is a flowchart of an adjustable collision trigger method of the present invention. It is a flowchart which judges whether the collision condition of this invention is achieved. It is a collision response curve figure of invention. FIG. 4 is a relationship diagram between speed and time of the adjustable collision trigger device of the present invention. It is an x-axis acceleration curve figure of the present invention. It is an acceleration curve figure of the y-axis of the present invention. It is an acceleration curve figure of the z axis of the present invention. It is a synthetic acceleration curve figure of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adjustable collision trigger device 2 Emergency launch device 7 Composite acceleration curve 11 Power supply module 12 Electronic acceleration sensor module 13 Microcomputer control module 41 Reference curve 42 First curve 43 Second curve 51 First relationship curve 52 Second relationship curve 53 3 relationship curve 54 4th relationship curve 55 5th relationship curve 61 x-axis acceleration curve 62 y-axis acceleration curve 63 z-axis acceleration curve 131 Immediate processing unit 132 Beacon operation command unit

Claims (25)

Comprehensive power supply module, electronic acceleration sensor module and microcomputer control module,
The power supply module provides power and the electronic acceleration sensor module measures at least one axis acceleration value of the moving object;
The microcomputer control module is connected to the power supply module, and includes at least an immediate processing unit and a beacon operation command unit,
The immediate processing unit receives at least one-axis acceleration value measured by the electronic acceleration sensor module, determines whether the moving object achieves a collision condition and transmits one driving signal;
The beacon activation command unit receives a drive signal transmitted by the immediate processing unit, is simultaneously activated by the drive signal, and transmits one trigger warning signal.   2. The adjustable collision trigger device according to claim 1, wherein the time for determining whether or not the immediate processing unit achieves the collision condition of the moving object is between 1 ms and 50 ms.   2. The adjustable collision trigger device according to claim 1, wherein one critical acceleration value and one minimum speed change amount of the immediate processing unit are preset, and it is determined whether or not the moving object satisfies a collision condition. .   4. The adjustable collision trigger device according to claim 3, wherein the critical acceleration value is adjusted based on the form of the moving object, and is adjusted for the immediate processing unit by a computer program. In the method of determining whether the moving object reaches the collision condition of the immediate processing unit, the acceleration value of at least one axis of the moving object measured by the electronic acceleration sensor module is captured,
Calculate the combined acceleration value of the moving object,
Judge that the combined acceleration value is larger than the critical acceleration value,
Calculate the amount of change in the composite speed of the moving object, and
2. The adjustable collision trigger device according to claim 1, wherein the composite speed change amount is determined to be larger than the minimum speed change amount.   6. The adjustable collision trigger device according to claim 5, wherein the resultant acceleration value is summed by squaring the acceleration values of the respective axes to be a square root of the obtained added value.   6. The adjustable collision trigger device according to claim 5, wherein the combined speed change amount is summed by squaring the speed change amounts of the respective axes to be a square root of the obtained added value.   6. The adjustable collision trigger device according to claim 5, wherein when the combined acceleration value is smaller than the critical acceleration value, the acceleration value of at least one axis of the moving object is further captured and judged again.   6. The adjustable collision trigger device according to claim 5, wherein when the combined speed change amount is smaller than the minimum speed change amount, the acceleration value of at least one axis of the moving object is captured again and determined.   The adjustable collision trigger device according to claim 1, wherein the trigger warning signal is transmitted to an emergency launch device.   11. The adjustable collision trigger device according to claim 10, wherein the emergency launch device can be an emergency emergency locator transmitter (ELT).   The adjustable collision trigger device according to claim 1, wherein the power supply module can be a rechargeable battery.   The adjustable collision trigger device according to claim 1, wherein the moving object can be a land, sea, and air transportation.   2. The adjustable crash trigger according to claim 1, wherein the microcomputer control module further includes a self-check unit, and the self-check unit tests whether the adjustable crash trigger device is normal. apparatus.   15. The adjustable collision trigger device according to claim 14, wherein the self-check unit performs a self-check by receiving a signal from the emergency launch device.   15. The adjustable crash trigger device of claim 14, wherein the self-check unit can issue a warning message when it reconnaissance that a failure has occurred in the adjustable crash trigger device.   17. The adjustable collision trigger device according to claim 16, wherein the warning message is voice or light.   2. The adjustable collision according to claim 1, wherein the microcomputer control module further includes a reset unit, and the reset unit receives a signal from the emergency launcher and resets the microcomputer control module. Trigger device. Measure the acceleration value of at least one axis of the moving object,
Determine if the moving object achieves the collision condition,
And the method of the adjustable collision trigger characterized by transmitting a trigger warning signal.   20. The adjustable collision trigger method according to claim 19, wherein when the moving object does not achieve a collision condition, the acceleration value of at least one axis of the moving object is measured again. The method for judging whether or not the moving object achieves the collision condition includes the following:
Capture at least one axis acceleration value of moving objects,
Calculate the resultant acceleration value,
Judge that the combined acceleration value is larger than the critical acceleration value,
Calculate the amount of change in the synthesis speed of the moving object,
21. The adjustable collision trigger method according to claim 20, wherein the composite speed change amount is determined to be larger than the minimum speed change amount.   22. The method of adjusting an adjustable collision trigger according to claim 21, wherein when determining that the combined acceleration value is smaller than the critical acceleration value, the determination is performed by capturing again the acceleration value of at least one axis of the moving object.   23. The adjustable collision trigger method according to claim 21, wherein when the combined speed change amount is smaller than the minimum speed change amount, the determination is made by capturing again the acceleration value of at least one axis of the moving object.   The adjustable collision trigger method according to claim 21, wherein the resultant acceleration is obtained by adding the squares of at least uniaxial acceleration values to obtain a square root of the obtained addition value.   23. The adjustable collision trigger method according to claim 21, wherein the combined speed change amount is obtained by adding at least the square of the uniaxial speed change amount and obtaining the square root of the obtained added value.

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