KR200278118Y1 - Sensor for checking out status of seat belt - Google Patents

Abstract

The present invention relates to a belt wearing detection device, and more particularly, according to whether the belt is worn, using a Hall sensor operated by the magnetic field change of the magnet provides a device for detecting whether the seat belt wearing by a non-contact detection method. It is. As described above, the means for achieving the object of the present invention and the Hall sensor protection for the current limit and noise protection for Hall sensor protection; When the buckle is inserted by the user, the polarity of the magnet is changed to the N pole and S pole; A Hall sensor turned on or off by a polarity change of the magnet; An airbag control output signal unit outputting a signal according to an on / off signal of the hall sensor; It consists of tension and operation signal output unit.

Description

Sensor for checking out belt wear {Sensor for checking out status of seat belt}

The present invention relates to a seat belt detection device, and more particularly to a belt wear detection device having a non-contact detection feature using a Hall sensor that operates according to the magnetic field change of the magnet. Conventional belt wearing detection is detected by a micro switch. More specifically, when a passenger inserts a tongue into a buckle to wear a seat belt, a micro switch provided in the buckle is provided. On and also when the occupant removes the tongue from the buckle to release the seatbelt, the microswitch inside the buckle is turned off to detect whether the occupant is wearing the seatbelt. do.

Therefore, whether the seatbelt is detected by the conventional micro switch has a problem in that it cannot guarantee long-term durability and reliability due to damage and abrasion of the contact and an increase in contact resistance by a mechanical contact and a contact method.

It is an object of the present invention to provide a seat belt wearing detection device for non-contact detection using a Hall sensor that operates according to the magnetic field formed by the change of position of the magnet to detect seat belt wearing.

Another technical problem to be achieved by the present invention is to provide an airbag control signal output when the hall sensor is turned on (off) depending on whether the seat belt is worn.

Another technical object of the present invention is to provide a tension and an operation signal output when the hall sensor is turned on (off) depending on whether the seat belt is worn.

1 is a circuit diagram of the belt wear detection device according to the first embodiment of the present invention.

2 is a circuit diagram of the belt wear detection device according to a second embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: Hall sensor 101: magnet

110: hall sensor protection unit 120: airbag control signal output unit

121: Hall sensor output bias resistor 130: Ten wire and operation signal output unit

141: power supply VCC 142: airbag control signal output terminal

143: signal output terminal of tension and operation 144: ground terminal (GND)

In order to achieve the above technical problem, the present invention provides a belt wear detection device comprising: a magnet 101 having a polarity selectively converted to an N pole and an S pole as the tongue attached to the belt is attached to and detached from the buckle; As the polarity of the magnet is changed, the Hall sensor 100 is turned on (OFF) is supplied with power; Hall sensor protection unit 110 for preventing electric shock and noise with respect to the Hall sensor; An airbag control signal output unit 120 that is switched according to the ON / OFF of the hall sensor and outputs a change of the airbag control signal according to whether the belt is worn; The present invention provides a belt wearing or not detecting device including a tension and an operation signal output unit 130 that detects whether a seat belt is worn and configures and outputs a tension and an operation signal.

More specifically, as shown in FIG. 1 according to the first embodiment of the present invention, the belt wear detection device of the first embodiment of the present invention, when power is applied to the battery power supply VCC (141) end, the hall sensor ( Hall sensor protection unit 110 composed of a current limiting resistor R1 and a noise filtering C1 is configured to mitigate electrical shock and noise shock and operate safely, and when the tongue of the belt is inserted into the buckle by the user, N Hall sensor 100 switches to ON and OFF signals according to the change of the polarity of the magnet 101 and the polarity of the magnet 101 to the S pole in the S-pole. It is configured to reliably detect whether the belt is worn by the configurable pull-up resistor R2.

In order to achieve the above technical problem, the present invention, according to the ON (OFF), OFF (OFF) of the hall sensor 100, when the tongue is not inserted into the buckle, that is, when the user does not wear a belt, When the hall sensor 100 is turned off, the transistor TR2 of the airbag control signal output unit 120 is turned on, and the airbag control signal output terminal 142 turns on the resistor R4 and the transistor TR2. Since it is connected to the ground terminal, the airbag control signal output terminal 142 has a value of only the resistor R4.

On the other hand, when the Hall sensor 100 is OFF (OFF), the transistor TR3 of the tension and operation signal output unit 130 is turned on (ON) and the tension and operation signal output terminal is connected to the ground terminal GND (144), The seat belt will be removed.

Then, when the user wears a belt and the tongue is inserted into the buckle, the hall sensor 100 is turned on and the transistor TR2 is turned off to the airbag control signal output unit 120, thereby controlling the airbag. The signal output terminal 142 is connected to the resistor R4, the resistor R3, and the current limiting resistor R1 of the Hall sensor protection unit 110, and is connected to the ground terminal GND 144 through the transistor TR1 which is always ON. Since the airbag control signal output terminal 142 has the sum of the resistance (R4) and the resistor (R3).

On the other hand, when the Hall sensor 100 is turned on, the transistor TR3 is turned off in the tension and operation signal output unit 130 so that the tension and operation signal output terminal becomes high impedance and the belt It will detect that it is worn.

2 is a block diagram of a belt wearing detection device according to a second embodiment of the present invention.

As shown in Figure 2, the belt wear detection device according to a second embodiment of the present invention is a Hall sensor protection unit 110 of the first embodiment; Magnet 101; Hall sensor 100; An airbag control signal unit 120 for outputting a change in an airbag control signal according to whether a belt is worn by an on-off operation of a hall sensor to which power is applied; It is composed of a tension and operation signal output unit 130.

The tension and operation signal output unit 130 may include a transistor TR3 having a power supply VCC 141 connected to an emitter and a collector thereof at the tension and operation signal output terminal 143, and a base of the same transistor TR3 having a hall sensor. An output terminal of (100) and a structure connected to a resistor (R2) capable of applying a bias voltage to the base by the output terminal thereof.

Referring to the operation of the second embodiment of Figure 2 of the present invention configured as described above in detail.

Hall sensor protection unit 110, the magnet 101, the hall sensor 100, and the air sensor is applied to the power supply to change the airbag control signal according to whether the belt is worn by the on / off operation according to the magnetic field change of the magnet The operation and function of the control signal unit 120 is the same as the first embodiment of FIG. 1 described above in detail.

Hereinafter, the operation of the tension and operation signal output unit 130 of the second embodiment of FIG. 2 will be described in detail.

When the tongue is not inserted into the buckle, that is, when the user does not wear the belt, and the hall sensor 100 is turned off, the transistor TR3 is turned off and the tension and operation signal output terminals are in a high impedance state. It will detect that the belt is not removed.

Then, when the user's belt is inserted into the buckle, when the hall sensor 100 is turned on, the transistor TR3 is turned on to be connected to the collector, and the output terminal of the tension and operation signal is grounded. The VCC is applied between the terminal GND 144 and senses that the seat belt is worn.

The belt wearing detection device of the present invention detects whether the seatbelt of the vehicle is worn by applying a non-contact Hall sensor, thereby improving durability and reliability of the belt wearing detection device, and outputting airbag control signal changes, tension, and operation signals. The structure can be configured and operated independently or simultaneously, and has the effect of miniaturization and integration.

Claims (5)

Hall sensor protection unit for mitigating the electric shock and noise shock to the hall sensor, and securely protect; A magnet for changing the polarity from the N pole to the S pole or the S pole to the N pole when the tongue is inserted into the buckle by the user; A hall sensor which is supplied with a battery power and switches on and off according to a change in polarity of the magnet; Belt wearing, characterized in that provided with a belt wearing detection unit for outputting a belt detachable signal in accordance with the on-off switching signal of the Hall sensor, connected to the pull-up resistor constituting the bias output signal in the on, off switching control of the Hall sensor Whether the device is. The apparatus of claim 1, further comprising a pull-up resistor configured to configure a bias output voltage at an output terminal of the hall sensor to switch the hall and the sensor on and off according to a change in the polarity of the magnet. The sensor of claim 1, wherein the airbag control signal output terminal is connected to the collector via a first resistor, a second resistor in series, a base is connected to a fourth resistor of the hall sensor circuit, and an emitter is connected to ground. 1 transistor; A second transistor having a collector connected to the first resistor and a second resistor connected to the emitter, a ground connected to the emitter, and a base connected to the output terminal of the hall sensor having a pull-up resistor third resistor forming a bias output voltage; Belt wearing detection device, characterized in that consisting of. The output terminal of claim 1, wherein the sensing unit has a tension and an operation signal output terminal connected to a collector, an emitter connected to ground, and a base at an output terminal of a hall sensor having a pull-up resistor third resistor constituting a bias output voltage. Belt wearing detection device, characterized in that consisting of a third transistor connected. The sensor of claim 1, wherein the sensing unit has a power supply terminal connected to an emitter, a collector connected to a tension and an operation signal output terminal, and a base on an output terminal of the hall sensor having a pull-up resistor third resistor constituting a bias output voltage. Belt wearing detection device, characterized in that consisting of a third transistor connected.