JP2812603B2 - Failure detection device for occupant protection device - Google Patents

Abstract

PURPOSE:To secure a trouble detector for an occupant crash protective system, capable of informing any misconnection in a way of operating a warming means, even in the case where such one for single squib use is attached to a vehicle for plural squibs by the misconnection. CONSTITUTION:This trouble detector is provided with a connector 42 with a connecting terminal 52 conformed to a separate starting means 5 being not to be connected, a judging means 41B measuring an electrical state Vd related to two G sensors 3, 6 and a starting means 4 via the connector, and a warming means 8 being operated at a time when the judging means has judged something wrong with an occupant crash protective system on the basis of the electrical state. The judging means when the electrical state of the connecting terminal shows that the separate starting means is connected to the connecting terminal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for operating occupant protection means, that is, a failure detection device for an occupant protection device such as a vehicle airbag or a seat belt pretensioner.
In particular, the present invention relates to a failure detection device for an occupant protection device that enables an alarm when a plurality of activation devices are erroneously connected to a failure detection device that targets a single activation device for failure detection.

[0002]

2. Description of the Related Art In general, in an occupant protection system, a starter comprising a kind of heater called a squib is connected in series with a switch of a G sensor, and when the G sensor detects a sudden impact, the switch is closed and the squib is closed. The occupant protection means such as an airbag is operated by being energized.

Since the failure of this kind of occupant protection system is fatal, it is necessary to monitor the circuit voltage of the G sensor and the squib to check the soundness at all times, and to immediately activate the alarm means when an abnormality occurs. is there. Therefore,
Although the failure detection device for operating the alarm means is connected to the occupant protection device on the vehicle side, even when the two are not properly and securely connected, the failure detection device operates the alarm means assuming that an abnormality has occurred. It has become.

[0004] Figure 7 is a circuit diagram showing a conventional fault detection system for a passenger protection apparatus described in example Japanese Patent Application No. 2-312671 Patent specification and drawings (Figure 9), in this case, the fault detection object 1 shows a case where the occupant protection device has two activation means. In the figure, reference numeral 1 denotes an automobile battery, that is, a DC power supply, and 2 denotes an ignition switch connected to the high potential side of the DC power supply 1.

Reference numeral 3 denotes a G sensor connected to the ignition switch 2, which includes a resistor 3a having a relatively high resistance value, and a contact 3b which is connected in parallel with the resistor 3a and closes when a sudden impact due to a collision is detected. It is composed of Reference numerals 4 and 5 denote starting means or squibs comprising heaters, which are connected in parallel to each other and connected to the G sensor 3 and a G sensor described later through a failure detection device described later, and contact points 3b in the G sensor 3 and a squib described later. Closing the contacts in the G sensor
For example, it drives occupant protection means individually arranged in the driver's seat and the passenger's seat.

Reference numeral 6 denotes a G sensor having the same configuration as the G sensor 3, including a resistor 6a and a contact 6b connected in parallel with each other.
It is connected to squibs 4 and 5 via a failure detection device.
Each resistance value of the resistors 3a and 6a is represented by Rg, and each resistance value of the squibs 4 and 5 is represented by Rs, and there is a relation of Rg >> Rs between the respective resistance values Rg and Rs.

Reference numeral 7 denotes a failure detection device connected to the DC power supplies 1 to the G sensor 6, which connects the G sensors 3, 6 and the squibs 4 and 5 between the ignition switch 2 and the load of the DC power supply 1. G sensors 3 and 6 and squib 4
And 5 faults are detected. Reference numeral 8 denotes alarm means, for example, an alarm lamp driven by the failure detection device when a failure occurs.

[0008] The failure detection device 7 comprises the following elements 10 to 42. 10 is a diode inserted between one end of the G sensor 3 (point A on the low potential side) and one end of the squib 5 (high potential side), and 11 is one end of the G sensor 3 and one end of the squib 4 (high potential side). ) Is a diode inserted between the other end (low potential side) of the squibs 4 and 5 and one end of the G sensor 6 (point B on the high potential side).

Reference numeral 20 denotes an ignition switch 2 and a squib 5
The resistors 21 and 22 are inserted in series between the ignition switch 2 and the other end of the squib 5, and the resistor 23 is inserted between the G sensor 3 and the ground. 24, a resistor inserted between the ignition switch 2 and one end of the squib 4; 25, a resistor inserted between the other end of the squib 5 and ground; 26, a resistor inserted between the ignition switch 2 and the G This is a resistor inserted between the sensor 6.

The resistance values of the resistors 20 and 23 to 26 are represented by Rg, the resistance value of the resistor 21 is represented by R1, and the resistance value of the resistor 22 is represented by R2. V1 is the output voltage of the DC power supply 1 via the ignition switch 2, Vx4 is the potential at one end of the squib 4, Vx5 is the potential at one end of the squib 5, V2 is the potential at the other end of the squibs 4 and 5, and VR is the resistor. Potential at the connection point of 21 and 22, V
A and VB are points A and B, respectively.

Reference numeral 30 denotes an FE connected to one end of the squib 4.
T and 31 are FETs connected to one end of the squib 5, 32 is an FET connected to a connection point between the resistors 21 and 22, and
The output terminals of ET30 to ET32 are connected.

An operational amplifier 34 uses the potential Vx of the output terminals of the FETs 30 to 32 as a non-inverted input signal, and generates an output voltage Vo corresponding to the potential Vx. 35 to 38 are operational amplifiers 34
The resistor 35 is a resistor for adjusting the gain of the FE.
The resistor 36 is connected between the non-inverting input terminal of the operational amplifier 34, and the resistor 37 is connected between the output terminal of T30-32 and the non-inverting input terminal of the operational amplifier 34. And the inverting input terminal of the operational amplifier 34,
38 is inserted between the output terminal of the operational amplifier 34 and the inverted input terminal. Reference numeral 39 denotes a reference power supply for the output voltage Vr inserted between the resistor 36 and the ground. 40 is operational amplifier 3
4. A differential amplifier composed of resistors 35 to 38 and a reference power supply 39, and the amplification factor is G.

Reference numeral 41 denotes a determination means in the failure detection device 7,
When the ignition switch 2 is closed, the output voltage V1 of the DC power supply 1 is applied to start up. The FETs 30 to 32 are opened and closed, and the potentials VA, VB and V2 and the output voltage Vo of the operational amplifier 34 are taken in. When the alarm occurs, the alarm lamp 8 is driven. Reference numeral 42 denotes a connector for electrically connecting the failure detection device 7 to an airbag system on the vehicle body side.

FIG. 8 is a circuit diagram showing a failure detection device for an occupant protection device using only a single squib 4 as a starting means. 7A and 41A correspond to the failure detection device 7 and the judgment means 41, respectively. Yes, 1-4, 6, 8, 11, 12, 21-2
6, 30, 32, 34 to 40 and 42 are the same as described above.
The failure detection device 7A has the same configuration as the failure detection device 7 described above, except that components related to the squib 5 are omitted.

FIG. 9 is a schematic perspective view showing the appearance of the failure detection devices 7 and 7A. The appearance of the connector 42 is the same regardless of the difference between the specifications. Therefore, in the case of the failure detection device 7A for a single squib 4, the terminal portion corresponding to another squib 5 that is not actually connected is a dummy.

Next, the operation of the conventional failure detection device for an occupant protection device will be described with reference to FIG. First,
When the ignition switch 2 is closed, the failure detection device 7
To the output voltage V1 of the DC power supply 1. At this time,
As described above, since the resistors 3a, 6a, 20, 23 to 26 are set to the same resistance value Rg, while the contacts 3b and 6b of the G sensors 3 and 6 are open, the diode Ten~
The potentials at both ends of each of the 12 are almost equal, and no current flows through each of the diodes 10 to 12.

Accordingly, the determination means 41 measures the potential VA at the point A on the low potential side of the G sensor 3 and the potential VB at the point B on the high potential side of the G sensor 6, and in particular, measures the G sensors 3 and 6. Even if the resistance between the terminals of
Since 10 to 12 are reverse biased, disconnection failures of the G sensors 3 and 6 can be individually and reliably detected.

If the output voltages Vo of the differential amplifier 40 when the determination means 41 turns on the FETs 30 to 32 one by one are Vo4, Vo5 and VoR, respectively,

Vo4 = G (Vx4-VR) + Vr + Vofs Vo5 = G (Vx5-VR) + Vr + Vofs VoR = G (VR-VR) + Vr + Vofs = Vr + Vofs

## EQU1 ## Here, G is the amplification factor of the differential amplifier 40, Vx4, Vx5 and VR are the input voltages of the FETs 30 to 32, Vr is the output voltage of the reference power supply 39, and Vofs is the differential amplifier 40.
Is an offset component of the output voltage Vo. The input voltage VR of the FET 32 is also the inverted input voltage of the operational amplifier 34.

Normally, the relationship between the resistance value Rg of the resistors 3a and 6a in the G sensor and the resistance value Rs of the squibs 4 and 6 is Rg >> Rs, and the resistance of each of the series resistors 21 and 22 is The relationship between the values R1 and R2 is R1 >> R2, and the relationship between the normal value Rsc of each resistance value of the squibs 4 and 5 and the resistance value Rg and the relationship between the resistance values R2 and R1 are as follows:

Rsc / Rg = R2 / R1

## EQU1 ## Therefore,

Vx−VR = (V1−V2) (Rs−Rsc) / Rg

From the equation, the resistance value Rs of the squibs 4 and 5 is

Rs = Rsc + Rg (Vx−VR) / (V1−V2)

## EQU1 ## Here, Vx is the non-inverting input voltage of the operational amplifier 34, V1 is the voltage on the DC power supply 1 (high potential) side of the G sensor 3, and V2 is the voltage on the low potential side of the squib 5. Here, the resistance values of the squibs 4 and 5 are set to Rs4 and Rs4, respectively.
Assuming that s5,-and-are calculated from the expression and the expression is considered,

Rs4 = Rsc + Rg (Vo-VoR) / [G (V1-V2)] Rs5 = Rsc + Rg (Vo5-VoR) / [G (V1-V2)]

Is obtained. Therefore, if the determining means 41 determines that these resistance values Rs4 and Rs5 are abnormal, it turns on the alarm lamp 8 to notify an abnormality of the occupant protection device.
If the failure detection device 7 shown in FIG. 7 is erroneously connected to an occupant protection device having only a single squib 4, the voltage Vx5 or the like corresponding to the squib 5 cannot be obtained.
Lights up to notify the abnormality.

On the other hand, as shown in FIG. 8, a failure detection device 7A is a detection target for an occupant protection device having only a single squib 4.
For the sake of standardization, the external shapes of the connector 42 and the case are the same as those of the failure detection device 7 of FIG. 7 (see FIG. 9), and the basic operation of the determination means 41A is the same.

However, as shown in FIG. 10, when the failure detection device 7A of FIG. 8 is erroneously connected to the occupant protection device having the plurality of squibs 4 and 5, the voltage signal related to the squib 5 is completely input to the determination means 41A. Since it is not performed, the abnormality cannot be determined. Therefore, there is a danger that the alarm lamp 8 will not be turned on even though the floating squib 5 cannot be started.

[0032]

As described above, the conventional failure detecting device for an occupant protection device determines an abnormality when a single squib is erroneously connected to a plurality of squib occupant protection devices. No measures are taken to prevent the failure of the occupant protection device, and it is impossible to even start the occupant protection device, resulting in a very dangerous state.

The present invention has been made in order to solve the above-described problems. Even if a single squib is erroneously connected and mounted on a vehicle with a plurality of squibs, the alarm is activated to activate the squib. An object of the present invention is to provide a failure detection device for an occupant protection device that can notify connection.

[0034]

According to a first aspect of the present invention, there is provided a failure detection device for an occupant protection device, comprising: a connector having a connection terminal corresponding to another activation means that is not to be connected; A failure for an occupant protection device comprising: a determination unit that measures an electrical state related to a sensor and an activation unit; and an alarm unit that is activated when the determination unit determines an abnormality of the occupant protection device based on the electrical state. In the detection device, the determination means drives the alarm means when the electrical state of the connection terminal indicates that another activation means is connected to the connection terminal.

Further, according to a second aspect of the present invention, there is provided a failure detecting device for an occupant protection device, comprising a G sensor for detecting an impact and a G sensor.
When power is detected by the
Activating means for activating the protective means.
The failure detection device for the occupant protection device for detecting failure
Connected to another activation method that should not be connected.
Connector having connection terminal and connected to occupant protection device
And the G sensor and the activation means via the connector.
Determining means for measuring the electrical state of the
When the abnormality of the occupant protection device is determined based on the status,
Activated alarm means and the connection terminal of the connector
Signal line for sending specification signal related to the specification of means
Wherein the judging means drives the alarm means when the electric state of the connection terminal does not indicate the predetermined electric state.

Further, according to a third aspect of the present invention, there is provided a failure detection device for an occupant protection device, comprising a G sensor for detecting an impact and a G sensor.
When power is detected by the
Activating means for activating the protective means.
The failure detection device for the occupant protection device for detecting failure
Connected to another activation method that should not be connected.
Connector having connection terminal and connected to occupant protection device
And the G sensor and the activation means via the connector.
Determining means for measuring the electrical state of the
When the abnormality of the occupant protection device is determined based on the status,
Activated alarm means and the connection terminal of the connector
Signal line for sending specification signal related to the specification of means
And the determining means is based on the electrical state of the connection terminal.
To determine that another activation means is connected to the connection terminal
Including wrong connection determination means, another startup means connected
When the determination is made , the alarm means is driven.

[0037]

According to the first aspect of the present invention, when the electrical state corresponding to the starting means that should not be connected is measured via the connection terminal, it is determined that another starting means is erroneously connected. Activate alarm means.

According to a second aspect of the present invention, when a signal indicating a predetermined electrical state is not measured via the connection terminal, it is determined that the connector portion is in an erroneous connection state and the alarm means is activated.

According to a third aspect of the present invention, when the signal indicating the predetermined electrical state from the signal line is not measured through the connection terminal, another starting means is incorrectly connected, or It is determined that the unit has forgotten to connect, and the alarm unit is activated.

[0040]

【Example】

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing Embodiment 1 of the present invention.
7B and 41B correspond to the failure detection device 7A and the judgment means 41A, respectively, and represent 1 to 6, 8, 11, 12, 21 to 26, 30, 3
2, 34 to 40 and 42 are the same as described above. The failure detection device 7B has specifications for only the squib 4.

Reference numeral 50 denotes a resistor having a resistance value R3, and reference numeral 51 denotes a resistor having a resistance value R4 inserted between the resistor 50 and the ground. The potential Vd at the connection point between each of the resistors 50 and 51 is determined by a determination means. 41
B is input. Reference numeral 52 denotes a connection terminal provided on the connector 42 so as to be connected to one end of the resistor 50, and corresponds to one end of the squib 5 which should not be actually connected.
The other end of the squib 5 is connected to the anode (point C) of the diode 12, and the potential Vc at the point C is input to the determination means 41B through the squib 5 .

The resistors 50 and 51 constitute a voltage-dividing resistor for dividing the potential of the connection terminal 52. The judgment means 41B responds to the potential Vd indicating the electrical state of the connection terminal 52 by an alarm lamp. 8 is driven.

Next, the operation of the first embodiment of the present invention shown in FIG. 1 will be described with reference to the flowchart of FIG. First, the judging means 41B outputs a potential Vd corresponding to the electrical state of the connection terminal 52 via, for example, an AD converter.
Is measured (step S1), and it is determined whether or not Vd = 0 (step S2).

If the occupant protection device of the vehicle to which the failure detection device 7B is to be connected is correct and the squib 5 is not present, the connection terminal 52 is open and the potential Vd is set to the ground via the resistor 51. The level becomes 0, Vd = 0 is determined, and the process ends. On the other hand, when the target vehicle is incorrectly connected and the squib 5 is present, the potential Vd becomes

Vd = Vc · R4 / (Rs + R3 + R4)

The potential Vc at the point C is changed to the resistance values Rs and R3 of the squib 5 and the resistor 50 and the resistance value R4 of the resistor 51.
Thus, the divided voltage is obtained. In the equation, the potential Vc at the point C is a voltage divided by the resistance values Rg and Rs of the resistor 24 and the squib 4 and the resistance value Rg of the resistor 25,

Vc = V1 · Rg / (2Rg + Rs)

Is as follows. However, the resistance value R of the resistors 50 and 51
3 and R4 are sufficiently larger than the resistance value Rg, and the diodes 11 and 12 are normally in a cutoff state. If the input potential Vd satisfies the expression, it is considered that the squib 5 is erroneously connected, and the determination means 41B turns on the alarm lamp 8 (step S3).

In this way, the judgment means 41B makes the divided potential Vd
, It can be determined whether or not the squib 5 is incorrectly connected. Therefore, if the potential Vd is 0, it is regarded as normal, and the alarm lamp 8 is not turned on. If the value of the equation (or Vd ≠ 0) is shown, it is determined that the alarm is abnormal, and the alarm lamp 8 is turned on.

However, normally, the external appearance of the failure detecting device 7 is as shown in FIG. 3, and the intermediate connector 53 pulled out from the connector 42 via the extension portion so as to be easily connected to the squib 5 on the vehicle body side. Have. Also in this case, the structures of the connector 42 and the intermediate connector 53 are, for standardization,
Regardless of the number of target squibs, they have the same external shape.

Therefore, for example, in a check at the time of manufacturing a vehicle, a failure detecting device due to a connection error of the intermediate connector 53 or the like.
When the connection terminal 52 of 7B is opened as shown in FIG.
The potential Vd becomes 0, and the alarm lamp 8 is not turned on. For this reason, despite the fact that the connection is actually incorrect and the other squibs 5 cannot be energized,
The warning lamp 8 indicates a normal state.

Embodiment 2 FIG. Next, a description will be given of a second embodiment of the present invention in which an abnormal state can be notified at the time of manufacture even in the case of a connector structure in which a failure detection device is connected via an intermediate connector 53 as shown in FIGS. FIG. 5 is a circuit diagram showing Embodiment 2 of the present invention, where 7C and 41C correspond to the failure detection device 7B and the judgment means 41B, respectively. The failure detection device 7C has the same configuration as the above-described failure detection device 7B except that the abnormality determination criterion of the determination means 41C is different.

L is the ignition switch 2 and the connection terminal 52
And transmits a specification signal related to a specification having only a single squib 4. Reference numeral 54 denotes a resistor having a resistance value R5 inserted into the signal line L, and constitutes a load for applying the output voltage V1 to the connection terminal 52. The signal line L and the resistor 54 are provided instead of the squib 5 in a vehicle type having no squib 5. Also, although not shown in FIG. 5, when the intermediate connector 53 is provided, the resistor 54 is connected to the ignition switch 2 and the intermediate connector 53.
Inserted between 53 and.

Generally, a vehicle type having only a single squib 4 and not including the squib 5 applies an output voltage V1 to the connection terminal 52 via the resistor 54 from the ignition switch 2 in a facility test at the time of manufacturing the vehicle. Signal line L is provided. Therefore, depending on whether or not the potential Vd input to the determination means 41C indicates a predetermined voltage corresponding to the specification signal, the vehicle type to which the failure detection device 7C is connected is appropriate and the intermediate connector
It is possible to determine whether or not 53 has been securely connected.

Next, the operation of the second embodiment of the present invention shown in FIG. 5 will be described with reference to the circuit diagram of FIG. 4 and the flowchart of FIG. In FIG. 6, S1 and
S3 is the same step as described above. First, it is determined whether or not the current time is a manufacturing time (step S0). If the time is not a manufacturing time, the process returns immediately. If the time is a manufacturing time, it corresponds to a specification signal obtained from the connection terminal 52 via the signal line L. The measured potential Vd is measured (step S1). Although there are various known techniques for determining whether or not the device is at the time of manufacture, description thereof will be omitted here.

If the failure detecting device 7C is connected to an appropriate vehicle type having only a single squib 4, an intermediate connector 53 (see FIG. 4)
Is also securely connected, the potential Vd input to the determination means 41C is such that the output voltage V1 is equal to the resistances of the resistors 54 and 50 and the resistance 51d.
And the voltage divided by

Vd = V1 · R4 / (R3 + R4 + R5)

## EQU5 ##

On the other hand, when a vehicle type including a plurality of squibs is erroneously connected and one end of the squib 5 is connected to the connection terminal 52, the potential Vd becomes a voltage value according to the above-described equation. When the intermediate connector 53 is opened as shown in FIG. 4, the potential Vd becomes zero. Therefore, the determination means 41C determines whether the input potential Vd is normal or abnormal based on whether or not the input potential Vd is a voltage value according to the equation (step S20). Regardless of whether Vd is a voltage value according to the equation or 0, the alarm lamp 8 is regarded as abnormal.
Is turned on (step S3).

When it is confirmed that the connection state of the failure detection device 7C is proper, the failure detection device 7C is shipped as an actual vehicle product. At this time, since it has already been determined that the vehicle type is appropriate, there is no problem in the configuration of the vehicle side even if the signal line L and the resistor 54 are removed as in the case of FIG.

As described above, in the case of a single squib, in which the signal line L and the resistor 54 are removed separately from the time of manufacture, the determination means 41C determines whether the connector 42 is connected to the connector 42 when the potential Vd is at the ground level. The connection status should be determined to be normal. Therefore, when the product is completed, the judgment function of the judgment means 41C is changed to the judgment means 41B via a terminal (not shown) which can be controlled from the outside.
The switching may be performed in the same manner as described above.

Embodiment 3 FIG. In the above embodiment, the signal line L and the resistor 54 were connected by a special test facility only at the time of vehicle manufacture, and the signal line L and the resistor 54 were removed after the vehicle was completed. May be permanently installed in the vehicle to always generate the specification signal. In this case, regardless of whether the vehicle is being manufactured or not, the electrical state of the connection terminal 52, that is, the potential Vd based on the specification signal is always checked by the determination unit 41C, so that step S0 in FIG. Become. Also, no special equipment is required at the time of manufacture.

[0063]

As described above, according to the first aspect of the present invention, there is provided a connector having a connection terminal corresponding to another activation means which should not be connected, and a G sensor and an activation means via the connector. In a failure detection device for an occupant protection device comprising: a determination unit that measures an electrical state; and an alarm unit that is activated when the determination unit determines an abnormality of the occupant protection device based on the electrical state. Since the alarm means is driven when the electrical state of the connection terminal indicates that another activation means is connected to the connection terminal,
Even if a single squib is erroneously connected and mounted on a vehicle with a plurality of squibs, there is an effect that a fault detecting device for an occupant protection device capable of notifying the erroneous connection by operating an alarm means is obtained.

According to the second aspect of the present invention, the shock is
The G sensor to detect and the G sensor
Activating means to activate the occupant protection means when energized when
The occupant protection device for detecting the failure of the occupant protection device having
Should not be connected in the fault detection device for the protective device
It has a connection terminal corresponding to another activation means and
Connector connected to the protective device and the G
Judgment to measure the electrical state associated with the sensor and the activation means
Means and an occupant protection device based on the electrical state.
Alarm means that is activated when an abnormality is detected in the
To the connection terminals of the
And a signal line for delivering items, determining means, the electrical state of the connection terminals so as to drive the warning means when not exhibit a predetermined electrical condition, those for single squib Even if the erroneous connection is installed in a vehicle with a plurality of squibs, or if the connector is forgotten to be connected at the time of manufacture, there is an effect that a failure detection device for an occupant protection device capable of notifying the erroneous connection by activating an alarm means is obtained.

Further, according to the third aspect of the present invention, the impact can be reduced.
The G sensor to detect and the G sensor
Activating means to activate the occupant protection means when energized when
The occupant protection device for detecting the failure of the occupant protection device having
Should not be connected in the fault detection device for the protective device
It has a connection terminal corresponding to another activation means and
Connector connected to the protective device and the G
Judgment to measure the electrical state associated with the sensor and the activation means
Means and an occupant protection device based on the electrical state.
Alarm means that is activated when an abnormality is detected in the
To the connection terminals of the
A signal line for transmitting a signal, and another activating means is connected to the connection terminal based on the electrical state of the connection terminal.
It includes an incorrect connection determination means for determining that
The warning means is driven when it is determined that the moving means is connected. There is an effect that a failure detection device for an occupant protection device that can notify an erroneous connection by operating an alarm unit without special manufacturing equipment is obtained.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the first embodiment of the present invention.

FIG. 3 is an external view showing a structure of a connector section according to a second embodiment of the present invention.

FIG. 4 is a circuit diagram for explaining a problem of the first embodiment of the present invention.

FIG. 5 is a circuit diagram showing a second embodiment and a third embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the second embodiment of the present invention.

FIG. 7 is a circuit diagram showing a conventional failure detection device for an occupant protection device targeting a plurality of squibs.

FIG. 8 is a circuit diagram showing a conventional failure detection device for an occupant protection device intended for a single squib.

FIG. 9 is a perspective view showing a connector portion of a general failure detection device for an occupant protection device.

FIG. 10 is a circuit diagram for explaining a problem of a conventional failure detection device for a single squib occupant protection device.

[Explanation of symbols]

 3, 6 G sensor 3b, 6b Contact 4 Squib (starting means) 5 Squib (another starting means) 8 Alarm lamp 41B, 41C Judging means 42 Connector 52 Connection terminal L Signal line Vd Potential (electrical state)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B60R 21/32 B60R 16/02 G01P 21/00

Claims (3)

(57) [Claims] 1. An occupant protection device comprising: a G sensor including a contact that is closed when a predetermined impact or more is detected; and a starting unit that is energized by closing a contact in the G sensor to activate the occupant protection unit. A connector connected to the occupant protection device and having a connection terminal corresponding to another activation means that should not be connected to detect a failure of the G sensor and the activation means via the connector. A failure detecting device for an occupant protection device, comprising: a determination unit that measures the electrical state of the vehicle, and an alarm unit that is activated when the determination unit determines an abnormality of the occupant protection device based on the electrical state. In the above, the determination means drives the alarm means when the electrical state of the connection terminal indicates that the another activation means is connected to the connection terminal. Occupant protection apparatus failure detection device. 2. A G sensor for detecting an impact and the G sensor.
Failure detecting apparatus odor occupant protection apparatus for detecting a failure of the occupant protection device having but a starting means for actuating the occupant protection means is energized upon detection of a predetermined or more impact
Te, the connection terminals corresponding to different activation means not to be connected
And a connector connected to the occupant protection device; a determination unit configured to measure an electrical state related to the G sensor and the activation unit via the connector; and a determination unit configured to determine based on the electrical state. An alarm unit that is activated when an abnormality of the occupant protection device is determined; and a specification of the activation unit with respect to a connection terminal of the connector.
A signal line for transmitting a related specification signal , wherein the determination unit drives the alarm unit when the electrical state of the connection terminal does not indicate a predetermined electrical state. Failure detection device for occupant protection device. 3. A G sensor for detecting an impact and said G sensor
Failure detecting apparatus odor occupant protection apparatus for detecting a failure of the occupant protection device having but a starting means for actuating the occupant protection means is energized upon detection of a predetermined or more impact
Te, the connection terminals corresponding to different activation means not to be connected
And a connector connected to the occupant protection device; a determination unit configured to measure an electrical state related to the G sensor and the activation unit via the connector; and a determination unit configured to determine based on the electrical state. An alarm unit that is activated when an abnormality of the occupant protection device is determined; and a specification of the activation unit with respect to a connection terminal of the connector.
And a signal line for transmitting a related specification signal , wherein the determination means is based on an electrical state of the connection terminal.
It is determined that the another activation means is connected to the connection terminal.
Erroneous connection determination means, and the other activation means
A failure detection device for an occupant protection device, wherein the alarm device is driven when it is determined that the failure has occurred .