KR100591831B1 - Air bag multiplexing ignition apparatus - Google Patents

Abstract

The present invention relates to an airbag igniter, and in particular, to improve the safety of the airbag igniter by applying a multiplexing circuit to minimize the malfunction of the airbag due to the complexity of the igniter control due to the increase in the number of ignition circuits of the airbag igniter. And an airbag multiple ignition system with improved configuration.

Air Bag, Multiplexing, Ignition Circuit, Ignition Device

Description

AIR BAG MULTIPLEXING IGNITION APPARATUS

1 is a view showing the structure of an airbag ignition device according to the prior art,

2 is a structural diagram of an airbag multiple ignition device according to a preferred embodiment of the present invention,

3 is a block diagram of a diagnosis unit of the airbag multiple ignition device of FIG. 2;

4 is a block diagram of a switch unit of the airbag multiple ignition device of FIG.

Explanation of symbols on the main parts of the drawings

100: airbag multiple ignition device 110: top switch multiplexing unit

111: upper switch 113: gate driver

115: multiple control unit 120: lower switch multiplexing unit

130: single ignition power diagnostic block 131: ignition power

133: diagnostic block 135: diagnostic block control unit

140: single diagnostic block control unit 150: multiple switch control unit

160: airbag

The present invention relates to an airbag igniter, and in particular, to improve the safety of the airbag igniter by applying a multiplexing circuit to minimize the malfunction of the airbag due to the complexity of the igniter control due to the increase in the number of ignition circuits of the airbag igniter. The present invention relates to an airbag multiple ignition device that has been designed and improved efficiently.

In the event of a vehicle crash, the Air Bag, a device that protects passengers from impacts from collisions with the front and side parts of the vehicle, includes seat belts, anti-lock brake systems (ABS) and side-door beams. It is a representative passenger protection device among safety equipments of vehicles such as the TCS (Traction Control System).

The official name of the airbag is the SRS (Supplemental Restraint System) airbag, which shows the best performance when the seat belt is worn.

The airbag system consists of a sensor diagnostic module (SDM) and an air-bag module (SDM). The detection system consists of a sensor, a battery, and a diagnostic device. The airbag module consists of an airbag and an actuator gas expansion device. do.

When a collision is detected by the sensor, the bag is momentarily inflated by the gas generated when the actuator is exploded, and the airbag is fully operated from the collision within a short time of 0.03-0.05 seconds. Done.

In general, airbags only operate under strong impact when they hit the front of a fixed wall that does not move or move at a speed of about 20-30 km / h. However, it can also work when the car is shocked by the front bumper while driving or falls into a pit.

That is, the airbag does not determine whether it is operated by a human or a computer accurately, but determines whether it is operated by a mechanical device. Therefore, the airbag may not be fired even in a dangerous situation, and may be fired by a minor contact accident that is not so dangerous. .

In particular, a minor accident may cause the airbag to burst, causing the child in the front seat to die. The force generated when the airbag is unfolded can lead to fatal injuries to children, the elderly and women.

In order to solve this problem, a low-pressure airbag was introduced, which reduced the inflated strength of the existing airbag by about 20%, which lowered the risk of passengers from inflation pressure in low-speed collisions. Smart airbags are being developed that incorporate a weight-sensing sensor on the seat to prevent the car from working even if it crashes.

However, the malfunction of the airbag should be controlled throughout the airbag system, and the malfunction of the airbag ignition device that detonates the airbag by finally performing the airbag ignition operation under the control of the airbag electronic control unit (ECU) must be considered very important. do.

Regardless of general airbag, low pressure airbag or smart airbag, the airbag igniter used in the conventional airbag system is packaged with upper and lower switches and diagnostics on a single IC chip, which prevents malfunction due to noise regardless of ECU control. There is a problem that the risk of causing high as well as the ignition power, the top switch, the bottom switch and the diagnostic unit for each ignition circuit is provided with a complicated circuit and the cost of the configuration increases.

In addition, the conventional airbag ignition device has a complicated control of the ignition circuits constituting the ignition device due to the increase in the number of ignition circuits in the airbag system has difficulty in stable control, which can cause an airbag ignition accident due to an unexpected malfunction There is this.

1 is a view showing the structure of an airbag ignition device according to the prior art, as shown in the prior art airbag ignition device should be provided with the same ignition circuit (10a, 10b, ..., 10n) corresponding to the airbag, respectively. This means that as the number of ignition circuits increases, the number of related devices must increase, resulting in a complicated control of the ignition device and an increase in cost to accommodate it.

In addition, as shown in FIG. 1, the upper and lower switches 13 and 15 and the diagnostic block 11 are all provided in one IC package, so the upper and lower switches 13 and 15 are turned on by noise. This may cause unexpected airbag ignition accidents.

Therefore, an object of the present invention for solving the above problems is to distribute the upper and lower switches and the diagnostic unit provided in one IC package in the airbag ignition device by air bag multiple ignition device that can prevent the malfunction of the ignition device due to noise To provide.

It is also an object of the present invention to provide an airbag multiple ignition apparatus capable of performing stable control of a plurality of ignition circuits by multiplexing the upper and lower switches of the ignition circuit, which had to be provided for each airbag constituting the airbag ignition apparatus.

In addition, an object of the present invention is to reduce the number of parts of the ignition device by reducing the number of parts of the ignition device by integrating the ignition power and the diagnostic unit of the ignition circuit that had to be provided for each air bag constituting the air bag ignition device and multiplexing the upper and lower switches respectively. The present invention provides an airbag multiple ignition device capable of performing stable control of a plurality of ignition circuits.

In order to achieve the above object, the present invention includes an ignition power source for igniting an airbag, an upper / lower switch, a diagnostic block, a switch control unit for controlling the upper / lower switch, and a diagnostic block control unit for controlling the diagnostic block. In the airbag ignition device,

A multiplexer for a top switch configured to include a predetermined number of top switches respectively corresponding to a plurality of airbags;

A lower switch multiplexing unit configured to include a predetermined number of lower switches which are paired with the upper switches respectively corresponding to a plurality of airbags;

A single ignition power diagnosis block comprising the ignition power source and the diagnostic unit as a single block such that the diagnostic unit directly controls the output of the ignition power source;

A multiple switch controller for controlling the multiplexer for the upper switch and the multiplexer for the lower switch;

It provides a multiple airbag ignition device; consisting of; a single diagnostic block control unit for controlling the single-ignition power diagnostic block.

The method of claim 1, wherein the upper switch multiplexer and the lower switch multiplexer,

A predetermined number of switches coupled to the single ignition power diagnostic block and an ignition power transmission line, respectively;

A gate driver for operating the switch by a separate driving voltage,

Provided is an airbag multiple ignition device, characterized in that composed of a multi-control unit for controlling the gate driver according to the control of the multi-switch control unit.

In addition, in the airbag multiple ignition apparatus according to the present invention, the single-ignition power supply diagnostic block diagnoses the voltage and current of the ignition power supply and diagnoses the resistance of the ignition circuit and the short circuit and disconnection to the diagnostic block and the control unit of the single diagnostic block control unit. According to the diagnostic block control unit for controlling the diagnostic block.

In the airbag multiple ignition apparatus according to the present invention, the ignition power source is a voltage power source boosted using a large capacity capacitor.

In addition, in the airbag multiple ignition apparatus according to the present invention, the upper switch and the lower switch are characterized in that they are implemented using a power MOSFET.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same components have the same reference numerals as much as possible even if they are displayed on different drawings. Detailed descriptions of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention will be omitted.

2 is a structural diagram of an airbag multiple ignition device according to a preferred embodiment of the present invention, FIG. 3 is a block diagram of a diagnosis unit of the airbag multiple ignition device of FIG. 2, and FIG. 4 is a switch unit of the airbag multiple ignition device of FIG. 2. It is a block diagram.

As shown in FIG. 2, the airbag multiple ignition device 100 according to the present invention includes an upper switch multiplexing unit 110, a lower switch multiplexing unit 120, a single ignition power diagnosis block 130, and a diagnostic block control unit ( 140, and a multi-switch control unit 150.

The ignition power source 131 for igniting the airbag 160 is connected to the single ignition power diagnosis block 130, and the single ignition power diagnosis block 130 is controlled by the single diagnosis block control unit 140. In order to supply ignition power to the corresponding switch SW of the upper and lower switch multiplexing units 110 and 120, the respective channels are connected.

Meanwhile, the airbag multiple ignition device 100 further includes a single diagnosis block control unit 140 and a multiple switch control unit 150. The single diagnosis block control unit 140 and the multiple switch control unit 150 diagnose an airbag ECU. The block control unit 40 and the switch control unit 30 are improved to be applicable to the airbag multiple ignition device 100 according to the present invention.

The single diagnostic block control unit 140 and the multi-switch control unit 150 according to a preset diagnostic program is the single-ignition power diagnostic block 130, the upper switch multiplexing unit 110 and the lower switch multiplexing unit 120 Control each.

The ignition power 131 is preferably to be able to supply the ignition power to a plurality of ignition circuit by using a voltage power boosted by using a large capacity capacitor.

In addition, as shown in FIG. 3, the ignition power source 131 is composed of an ignition circuit diagnosis block 133 and a single block so that an output can be directly controlled according to the control of the single ignition power diagnosis block 130.

The single ignition power diagnosis block 130 diagnoses the voltage, current and capacity of the ignition power 131, and diagnoses the resistance of the ignition circuit to determine the disconnection or short circuit, the voltage of the ignition power 131 and Diagnostic block 133 for diagnosing current and diagnosing resistance, short circuit, and disconnection of the ignition circuit, and diagnostic block control unit 135 for controlling the diagnostic block 133 according to the control of the single diagnostic block controller 140. It is composed.

As shown in FIG. 4, the upper and lower switch multiplexing units 110 and 120 include a predetermined number of lower and upper switches respectively corresponding to a plurality of airbags. Configure.

The upper and lower switch multiplexing units 110 and 120 require high-speed operation due to the operation characteristics of the airbag, so that a predetermined number of power MOSFETs such as four, six, and eight upper and lower switches constituting the multiplexer may be used. .2A) can be packaged into a single IC for implementation.

As shown in FIG. 4, the multiplexing units 110 and 120 for the upper and lower stage switches are connected to the single ignition power diagnosis block and the predetermined number of switches 111 respectively connected to the ignition power transmission line, and to a separate driving voltage. As a result, a gate driver 113 for operating the switch and a multiple controller 115 for controlling the gate driver 113 according to the control of the multi-switch controller 150 are provided.

As described above, the airbag multiple ignition device according to the present invention is capable of improving the stability and safety of the ignition circuit essential for the airbag ECU for igniting the airbag, which is a passenger safety device of the vehicle, and the efficient configuration of the ignition circuit according to the multiplexing of the ignition switch and the possibility of malfunction of the airbag. Minimization and cost reduction due to the reduction of the number of parts can be realized.

On the other hand, in the detailed description of the present invention has been described with reference to specific embodiments, of course, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention has an effect of preventing malfunction of the ignition device due to noise by dispersing the upper and lower switches and the diagnostic unit provided in the airbag ignition device as one IC package.

In addition, the present invention has the effect of performing a stable control of a plurality of ignition circuits by multiplexing the upper and lower switches of the ignition circuit that had to be provided for each airbag constituting the airbag ignition device.

In addition, the present invention reduces the number of parts of the ignition device by reducing the number of parts of the ignition device by integrating the ignition power and the diagnostic unit of the ignition circuit which had to be provided for each air bag constituting the airbag ignition device and multiplexing the upper switch and the lower switch, respectively. It is effective to perform stable control of the ignition circuits.

Claims (5)

An airbag ignition device including an ignition power source for igniting an airbag, an upper and lower switches, a diagnostic block, a switch control unit for controlling the upper and lower switches, and a diagnostic block control unit for controlling the diagnostic block. A multiplexer for a top switch configured to include a predetermined number of top switches respectively corresponding to a plurality of airbags; A lower switch multiplexing unit configured to include a predetermined number of lower switches paired with the upper switches respectively corresponding to a plurality of airbags; A single ignition power diagnosis block comprising the ignition power source and the diagnostic unit as a single block such that the diagnostic unit directly controls the output of the ignition power source; A multiple switch controller for controlling the multiplexer for the upper switch and the multiplexer for the lower switch; And a single diagnosis block control unit for controlling the single ignition power diagnosis block. The method of claim 1, wherein the upper switch multiplexer and the lower switch multiplexer, A predetermined number of switches coupled to the single ignition power diagnostic block and an ignition power transmission line, respectively; A gate driver for operating the switch by a separate driving voltage, The airbag multiple ignition device, characterized in that composed of a multiple control unit for controlling the gate driver in accordance with the control of the multiple switch control unit. The method of claim 1 or 2, wherein the single ignition power diagnostic block, Diagnosis block for diagnosing the voltage and current of the ignition power and diagnosing resistance, short circuit and disconnection of the ignition circuit Multiple airbag ignition device, characterized in that the diagnostic block control unit for controlling the diagnostic block in accordance with the control of the single diagnostic block control unit. The method of claim 3, wherein the ignition power source, Airbag multiple ignition device characterized in that the voltage power up by using a large capacity capacitor. The method of claim 1 or 2, wherein the upper switch and the lower switch, An airbag multiple ignition device characterized by using a power MOSFET.

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