KR100456568B1 - Automobile collision sensor united with sensor for sensing the amount of collision - Google Patents

Abstract

The present invention relates to a collision sensor for an automobile integrated with a collision amount sensor, wherein the collision sensor and the collision amount sensor are integrated and modularized, and the collision amount sensor is driven by an electric motor linked to the operation of the switch part of the collision sensor during a collision. By rotating the tone wheel and detecting the collision amount signal through the change in the magnetic field generated between the tone wheel and the magnetic change detection means, it is possible to reduce the number of parts and the number of assembly lines through the sensor modularization, in particular the collision amount sensor Compared with the conventional collision sensor structure that detects the change of capacitance between two metal plates due to the displacement of the moving plate, it has a structure that is resistant to electromagnetic waves and external shocks, and is integrated with the collision amount sensor that can solve the malfunction of safety devices such as air bags. It relates to an automobile collision sensor.

Description

Automotive collision sensor united with sensor for sensing the amount of collision}

The present invention relates to a collision sensor for an automobile integrated with a collision amount sensor, and more particularly, the collision sensor and the collision amount sensor are integrated and modularized, and the collision amount sensor is linked to the operation of the switch part of the collision sensor during a collision. As the tone wheel is rotated by the driving of the motor and the collision amount signal is detected through the change in the magnetic field generated between the tone wheel and the magnetic change detection means, the number of parts and the number of line assembly can be reduced through the sensor modularization. Compared to the conventional collision sensor structure in which the collision amount sensor is configured to detect the change in capacitance between two metal plates due to the displacement of the moving plate, the collision amount sensor is constructed to be resistant to electromagnetic waves and external shocks, which can solve the malfunction of safety devices such as airbags. The present invention relates to an automobile collision sensor integrated with a mass sensor.

In general, the most important aspect of a vehicle is the safety of the occupant in the event of an accident, and recently, the standard for determining the performance of the vehicle is changing to the safety level of how much the occupant can be protected in the event of an accident rather than a simple performance. .

Therefore, recently developed vehicles are essentially equipped with a number of safety devices for improving the safety of the occupants, a representative example is the airbag system.

This airbag system aims to minimize the degree of injury by protecting the occupants' heads and chests by preventing the occupants from directly hitting the body by momentarily deploying the airbags when a vehicle crash occurs while driving.

The airbag system as well as safety devices requiring momentary operation in a vehicle collision detect the vehicle collision moment and the collision amount through a collision sensor and an acceleration sensor.

Here, the collision sensor detects the moment of collision of the vehicle and the acceleration sensor is configured to detect the collision amount of the vehicle, so that the two sensors that detect this only when a large amount of collision is greater than a certain degree to the airbag system An electrical signal is applied.

That is, the two sensors selectively apply an electrical signal to the airbag system according to whether a large collision amount requiring airbag deployment occurs, and the configuration of each sensor is schematically illustrated in FIGS. 3 and 4.

First, the collision sensor is configured to selectively perform on / off operation of the switch unit according to the dynamic characteristics of the mass body for the collision, and whether the on operation of the switch unit requires airbag deployment. A collision will occur.

Referring to FIG. 3, the collision sensor 10 will be described. A switch part 16 is formed at one side in front of the housing 1, and a magnetic body 12 having a predetermined inertial mass is formed inside the housing 1. It is installed to be movable forward / backward while being elastically supported by the front coil spring 14.

The magnetic body 12 is to be momentarily moved toward the collision direction, that is, toward the front switch unit 16 while compressing the coil spring 14 by the inertia when the vehicle collision occurs, the size of the vehicle collision is a certain degree or more In this case, while the magnetic body 12 approaches the switch unit 16 within a predetermined distance, the switch unit 16 is turned on by the magnetic force of the magnetic body 12.

Of course, in the collision sensor 10, the coil spring (so that the magnetic body 12 can be approached within a distance for turning on the switch unit 16 while compressing the coil spring 14 only when a vehicle collision occurs to a certain degree or more. Of course, the elastic modulus of 14) and the inertial mass of the magnetic body 12 should be considered in advance.

On the other hand, the acceleration sensor is mainly used a capacitive acceleration sensor for detecting a change in capacitance (capacitance) between the two metal plates according to the dynamic characteristics of the mass body.

As shown in FIG. 4, the capacitive acceleration sensor 20 has a fixed plate 22 which is completely fixed in position by a fixed beam 24 and parallel to the fixed plate 22 as a mass at a predetermined interval. It includes a movable plate 26 disposed.

The moving plate 26 is elastically supported by the elastic beam 28 to be displaced while being flowed by a force applied from the outside, and the displacement between the two plates 22 and 26 changes as the displacement occurs. It is supposed to be.

Here, the capacitance value between the two plates 22 and 26 varies depending on the displacement amount of the movable plate 26 due to the acceleration action, that is, the distance between the two plates 22 and 26. In the acceleration sensor, the capacitance value The magnitude of the collision is detected.

However, in the related art, as described above, the collision sensor and the collision amount sensor (acceleration sensor) are separated from each other, thereby increasing the number of assembly lines on the line. In particular, the impact amount sensor is easily affected by electromagnetic waves, Due to the very weak structure, there was a problem that a malfunction of a safety device such as an air bag easily occurred.

Therefore, the present invention has been invented to solve the above problems, and integrated the impact sensor and the collision amount sensor and modularized, the impact amount sensor is driven by the driving of the electric motor linked to the operation of the switch unit of the impact sensor during the impact The rotation amount is detected and the amount of collision signal is detected through the change in the magnetic field generated between the tone wheel and the magnetic change detection means, thereby reducing the number of parts and the number of line assembly labor through the sensor modularization, and in particular, the impact amount sensor is moved. Compared to the conventional collision sensor structure that detects the change of capacitance between two metal plates due to the displacement of the plate, it has a structure that is resistant to electromagnetic waves and external shocks, and integrated with the collision amount sensor that can solve the malfunction of safety devices such as airbags. It is an object of the present invention to provide a collision sensor for a vehicle.

1 is a block diagram showing an integrated vehicle collision sensor and the collision amount sensor according to the present invention

2 is a cross-sectional view showing the magnetic pickup of the present invention.

3 is a schematic view showing the configuration of a conventional collision sensor

Figure 4 is a schematic diagram showing the configuration of a conventional acceleration sensor

<Explanation of symbols for the main parts of the drawings>

1 housing 3 first housing

5: 2nd housing 7: Terminal

30: collision sensor 31: moving object

32: magnetic material 33: coil spring

34: switch part 40: collision amount sensor

41: electric motor 43: tone wheel

44: magnetic change detection means

Hereinafter, the present invention will be described with reference to the accompanying drawings.

The collision sensor for a vehicle integrated with the collision amount sensor according to the present invention

An integrated first (3) and second housing (5);

A movable body 31 installed in the first housing 3 so as to be movable forward and rearward, a magnetic body 32 provided on the side of the movable body 31, and a coil spring elastically supporting the movable body 31 from the front ( 33) and the switch unit installed on the inner side of the first housing 3 so that the magnetic body 32 is approached within a predetermined distance by the spring compression movement of the movable body 31 at the time of collision and can be turned on by the magnetic force A collision sensor 30 comprising a 34;

An electric motor 41 installed inside the second housing 5 and driven on / off according to an on / off operation of the switch 34, and a tone wheel mounted on a rotating shaft of the electric motor 41; 43) and a collision amount sensor 40 including a magnetic change detection means 44 installed around the tone wheel 43 so as to detect a collision amount signal through a change in the magnetic field according to the rotation of the tone wheel 43; And

A terminal (7) installed in the first (3) or second housing (5) for outputting the signals detected from the collision sensor (30) and the collision amount sensor (40) to the outside;

Characterized in that consisting of.

In particular, the magnetic change detection means 44 is a permanent magnet 45, the yoke 46 for transmitting the magnetic flux of the permanent magnet 45 to the tone wheel 43 to detect the collision amount signal, and It is characterized in that the magnetic pickup having a pickup coil 47 for generating an alternating voltage due to the change in the magnitude of the magnetic flux according to the rotation of the tone wheel 43.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating an integrated vehicle collision sensor and a collision amount sensor according to the present invention.

As shown therein, the collision sensor 30 and the collision amount sensor 40 according to the present invention are integrally configured in one housing 1, and the housing 1 is configured of the collision sensor 30. It is divided into a first housing 3 in which the element is embedded and a second housing 5 in which the components of the collision amount sensor 40 are embedded.

First, when the collision sensor 30 is described, the movable body 31 having a predetermined inertial mass inside the first housing 1 can move forward / backward while being elastically supported by the coil spring 33 in front of it. Is installed.

The moving body 31 is capable of moving momentarily in the collision direction, that is, forward while compressing the coil spring 33 inside the first housing 3 by the moment of inertia of the vehicle.

In addition, the magnetic body 32 is installed on the side of the movable body 31, the magnetic body 32 approaches the inner side of the first housing 3 within a predetermined distance by the movement in the spring compression direction of the movable body 31. At the same time, the switch unit 34 is configured to be operated on by the magnetic force of the approached magnetic body 32.

Of course, in the collision sensor 30, the magnetic body 32 can be approached within a distance of turning on the switch unit 34 together with the movable body 31 only when a large collision of a certain degree or more, that is, a large collision requiring an airbag operation. Of course, the elastic modulus of the coil spring 33, the inertial mass of the movable body 31 and the magnetic body 32, the position before and after the switch 34 in the first housing 3, etc. should be considered in advance.

In FIG. 1, reference numerals 35a and 35b denote lead wires connected to terminals 7 provided on one side of the housing 1 from each contact of the switch unit 34.

On the other hand, the collision amount sensor 40 is an electric motor 41 in which the driving is turned on / off in conjunction with the on (on) / off (off) operation of the collision sensor switch 34 in the second housing (5). And a tone wheel 43 attached to the rotary shaft of the electric motor 41, and a magnetic change detection means 44 provided near the tone wheel 43.

Here, the electric motor 41 is installed so as to receive the driving power through the switch unit 34 of the collision sensor 30, while being driven by receiving the driving power while the switch unit 34 is turned on. The tone wheel 43 attached to the rotary shaft is rotated, and the driving is also turned off when the switch 34 is turned off.

In FIG. 1, reference numerals 48a and 48b denote brackets and bolts for fixing the electric motor 41, respectively.

The tone wheel 43 has a disk shape made of magnetic material, and a plurality of teeth 43a are formed on the periphery thereof.

In addition, the magnetic change detection means 44 is configured to detect a collision amount signal through a change in the magnetic field generated when the tone wheel 41 rotates, as shown in FIG. 2, the permanent magnet 45, Magnetic pickup including a yoke 46 to allow the magnetic flux of the permanent magnet 45 to be transmitted to the tone wheel 43, and a pickup coil 47 for generating an alternating voltage by changing the magnitude of the magnetic flux according to the rotation of the tone wheel 43. It can be carried out as.

That is, when the tone wheel 43 is rotated by the driving of the electric motor 41, the magnitude of the magnetic flux passing through the pickup coil 47 is changed to generate an AC voltage at both ends of the coil 47. It will show the collision amount signal soon.

The AC voltage generated by the pickup coil 47 of the magnetic pickup 44 is output to the outside through the lead wires 49a and 49b and the terminal 7.

Here, when the AC voltage represents the collision amount in more detail, the larger the collision amount, the longer the moving body 31 overcomes the restoring force of the coil spring 33, and thus the on operation time of the coil spring 33 is increased. And as the driving time of the electric motor 41 is longer, the magnetic field change time detected through the magnetic pickup 44 is proportionally longer.

Of course, this magnetic field change is due to the rotation of the tone wheel 43, the alternating voltage generated in the pick-up coil 47 while the tone wheel 43 is rotated, the external control means (eg ECU) via the terminal (7) , Not shown).

Here, the control means can calculate the amount of collision through the time when the AC voltage is input, the AC voltage generated from the pickup coil 47 will soon represent the amount of collision.

In FIG. 1, reference numerals 48a and 48b denote brackets and bolts for fixing the magnetic change detection means 44, respectively.

Hereinafter, the operating state of the present invention will be described.

In the frontal collision of the vehicle, the movable body 31 is momentarily moved in the collision direction, that is, forward while compressing the coil spring 33 by its inertia.

If the collision size is greater than or equal to a certain degree, the magnetic body 32 moving together with the movable body 31 approaches the switch unit 34 within the operating distance, and at the same time, the switch unit 34 is the magnetic body 32. It operates on magnetic force of).

As a result, in the collision sensor 30, the collision signal is applied through the lead wires 35a and 35b and the terminal 7 by the on operation of the switch 34.

Of course, the switch unit 34 is turned on only while the movable body 31 overcomes the restoring force of the coil spring 33 by the inertial force during the collision, so that the magnetic body 32 is within the on operating distance of the switch unit 34. .

In addition, the switch unit 34 is automatically turned off as soon as the movable body 31 moves backward by the restoring force of the compressed coil spring 33 and the magnetic body 32 deviates from the on-operation distance of the switch unit 34.

On the other hand, during the on operation of the switch unit 34, the electric motor 41 constituting the collision amount sensor 40 is driven, thereby rotating the tone wheel 43 mounted on the rotary shaft.

When the tone wheel 43 rotates, the magnetic pickup 44 detects a magnetic field change.

That is, when the tone wheel 43 is rotated, an alternating voltage is generated in the pickup coil 47 of the magnetic pickup 44 according to the magnetic field change, and the alternating voltage is transmitted to an external control means through the terminal 7. It can be calculated from the amount of collision.

In this way, in the present invention, the collision sensor and the collision amount sensor are integrated, and in particular, in the collision amount sensor, the magnetic change detection means reads the magnetic field change according to the rotation of the tone wheel to detect the collision amount. Compared to the conventional capacitive acceleration sensor that senses the change in capacitance between the two metal plates according to the structure, the structure is resistant to electromagnetic waves and external shocks.

As described above, in the present invention, the collision sensor and the collision amount sensor are integrated and modularized, and in particular, the collision amount sensor is configured to detect the collision amount through a change in the magnetic field generated by the rotation of the tone wheel. There is.

1) It is possible to reduce the number of parts and the number of assembly lines through modularization of the collision sensor and the collision amount sensor.

2) Since the structure of the collision sensor is stronger in electromagnetic waves and external shock than the conventional collision sensor structure configured to detect the change in capacitance between two metal plates due to the displacement of the moving plate, it can solve the malfunction of safety devices such as airbags. .

Claims (2)

delete An integrated first housing 3 and a second housing 5, a movable body 31 installed in the first housing 3 so as to be movable forward and backward, and a magnetic body provided on the side of the movable body 31. When the magnetic body 32 approaches within a predetermined distance due to the spring compression movement of the movable body 31 when colliding with the coil spring 33 which elastically supports the 32 and the movable body 31 from the front, the magnetic body 32 is turned on by the magnetic force. Collision sensor 30 including a switch unit 34 installed on the inner side of the first housing 3 so that it can be operated, and installed inside the second housing 5 and of the switch unit 34 The amount of collision signals through a change in the magnetic field according to the rotation of the electric motor 41 and the tone wheel 43 mounted on the rotary shaft of the electric motor 41 and the tone wheel 43 are driven according to the on / off operation Collision amount sensor 40 including a magnetic change detection means 44 installed in the vicinity of the tone wheel 43 to detect the ) And a terminal 7 installed in the first housing 3 or the second housing 5 to output signals detected from the collision sensor 30 and the collision amount sensor 40 to the outside. In the collision sensor for automobiles integrated with the mass sensor, The magnetic change detection means 44 is a permanent magnet 45, the yoke 46 for transmitting the magnetic flux of the permanent magnet 45 to the tone wheel 43 for detecting the collision amount signal, and the tone wheel ( A collision sensor for an automobile integrated with a collision amount sensor, characterized in that it is a magnetic pickup having a pickup coil 47 for generating an alternating voltage due to a change in magnetic flux magnitude in accordance with the rotation of 43.