JP2527980Y2 - Airbag device - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to an airbag device capable of notifying a circuit abnormality location of an airbag detonation circuit by a flashing mode of an alarm lamp.

[Related Art] In order to reduce even a fatal accident caused by a traffic accident, it is desired to introduce an airbag device for protecting a vehicle occupant, particularly a driver, from an impact at the time of a collision. In an airbag device 1 shown in FIG. 3, an airbag 2 is embedded in a central portion of a steering wheel of a vehicle, and a squib is operated by a pair of impact sensors 3 and 4 that close a contact when the vehicle receives an impact. A current exceeding a certain value flows through the detonating element 5. Since the detonating element 5 detonates the airbag 2 when the operating current is supplied, the airbag 2 explodes in an explosive manner and interposes between the steering wheel and the driver to perform a cushioning function. With regard to the impact applied to the vehicle, two types of impact sensors, high G sensing impact sensor 3 and low G sensing impact sensor 4 having different sensitivities to gravitational acceleration are used in combination so as to sense only an impact exceeding a certain limit. Are connected in parallel to the contacts of sensors 3 and 4,
They are connected in series with the detonating element 5 interposed therebetween. here,
One end of a resistor R3 in parallel with the high G sensing shock sensor 3 is connected to the DC power supply + B side through the explosion prevention switch 6, and one end of a resistor R4 in parallel with the low G sensing shock sensor 4 is grounded. Thus, the detonation circuit 7 is configured.

The explosion prevention switch 6 of the detonation circuit 7 is connected to a battery power supply 9 via a backflow preventing diode D1 and an ignition switch 8. Further, when the voltage of the battery power supply 9 drops below the specified voltage for some reason, a booster circuit that boosts the output voltage of the battery power supply 9 to the specified voltage.
10 is connected to a battery power supply 9 via a backflow prevention diode D2 and an ignition switch 8. Boost circuit
While the output current of 10 is supplied to the detonation circuit 7 via the diode D3, it flows into the capacitor C grounded by the charging resistor R2, and charges it. This capacitor C is
A diode that discharges when the voltage of the battery power supply 9 drops abnormally and functions as a so-called backup power supply that supplies a constant voltage to the detonation circuit 7 in place of the battery power supply 9.
D4 is connected in parallel to charging resistor R2.

Reference numeral 11 denotes a monitoring circuit that monitors the presence or absence of a circuit abnormality of the detonation circuit 7, and has a function of detecting an abnormality of the detonation circuit 7 and lighting a warning lamp 12 embedded in a meter box in a dashboard. In other words, the monitoring circuit 11
This function periodically takes in the voltage at the connection point of each element in the device, converts the taken voltage into digital data by AD conversion, and then determines whether there is an abnormality. Then, when an abnormality is found, the warning lamp 12 is immediately turned on to warn the user to request an inspection by a service person. In the case of this example, the first abnormality monitoring item is
The second is to open the explosion prevention switch 6, the second is to open the low G sensing shock sensor 4 and its low voltage side short circuit and the high G sensing shock sensor 3, and the third is to open the high G side.
The short circuit of the sensing shock sensor 3 and the short circuit of the high voltage side thereof and the short G of the low G sensing shock sensor 4, the opening of the detonating element 5, the fifth, the abnormal output of the step-up circuit 10, the sixth, and the sixth for the backup. 6 of short circuit of capacitor C
Item is applicable.

When the monitoring circuit 11 detects a circuit abnormality of the detonation circuit 7, the warning lamp 12 lights up, and at the same time, the notification lamp 13 blinks again. After confirming that the warning lamp 12 is turned on, the driver brings the vehicle to a service factory or receives a business trip service of a service person. The serviceman who receives the request and performs the inspection removes the mounting screw of the airbag device 1 incorporated in a part of the steering mechanism according to the operation manual. At this time, since the explosion prevention switch 6 is opened in conjunction with the mounting screw, the detonation circuit 7 is de-energized, and there is no fear of explosion. On the other hand, the abnormal point notification lamp 13 is intermittently energized and blinks at a cycle corresponding to the abnormal point.
, And during the warning period after the warning lamp 12 is turned on, two times, three times, five times, seven times, respectively, according to the abnormality of the second to sixth items. As in the case of eight times, a cycle of blinking continuously and immediately turning off the light for a while is repeated. For the abnormalities listed in the first item,
Since the abnormal location notification lamp 13 continues to light up, the service person directly looks at the blinking mode of the abnormal location notification lamp 13 with eyes,
By collating with the work manual, the abnormal part can be immediately specified.

[Problem to be Solved by the Invention] In the above-described conventional airbag device 1, in addition to a warning lamp 12 for notifying a driver of an abnormality, an abnormal portion notification lamp 13 for a serviceman needs to be connected to the monitoring device 11. In order to guarantee the reliable operation of the detonation circuit 7, the provision of two types of lamps 12 and 13 for warning and abnormality notification is against the flow of parts cost reduction. In addition, since the abnormal position notification lamp 13 must be incorporated in a part of the steering mechanism so that only a service person who performs the inspection can understand, there is a problem that the assembly process of the vehicle is likely to be complicated.

[Means for Solving the Problems] The present invention has solved the above-mentioned problems, and is provided with an airbag that explodes and expands in an emergency to protect the occupants of the vehicle, and is energized through an explosion prevention switch. A detonation circuit that detonates the airbag when a shock exceeding the detection point is detected, a monitoring circuit that monitors a circuit abnormality of the detonation circuit, and is connected to the monitoring circuit, and is turned on or off when a circuit abnormality of the detonation circuit occurs. When the alarm switch is turned off and a warning is issued, and the explosion prevention switch is once opened and then closed while the warning is being issued, the switch is intermittently energized from the monitoring circuit, and is specific to an abnormal portion of the detonation circuit. And an alarm lamp which is driven to blink at a period of.

[Operation] The present invention provides an alarm lamp connected to a monitoring circuit for monitoring a circuit abnormality of an airbag detonation circuit, which is turned on or off when the circuit abnormality occurs, and issues a warning. When the explosion prevention switch in the detonation circuit is once opened and then closed in the state where it is in operation, it blinks at a specific cycle for the abnormal location and displays the abnormal location, thereby displaying the abnormal location notification lamp and warning that have been used conventionally. The two types of lamps are integrated into an alarm lamp.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a circuit diagram showing an embodiment of the airbag device of the present invention, and FIG. 2 is a signal waveform diagram of each part of the circuit shown in FIG.

An airbag device 21 shown in FIG. 1 is a device in which two kinds of lamps, that is, an abnormal point notification lamp 13 and a warning lamp 12, are newly integrated into a warning lamp 22.
The abnormal circuit location of the detonation circuit 7 can be notified by the blinking mode of the alarm lamp 22. That is, the alarm lamp 22 is activated when a circuit abnormality of the detonation circuit 7 is detected.
Like the conventional warning lamp 12, the lighting is driven by the monitoring circuit 11, and is lit in the meter box incorporated in the dashboard of the vehicle to issue a warning. Then, when the serviceman once opens and closes the explosion-prevention switch 6 while the warning is being issued, the flashing drive is performed at an abnormal point of the detonation circuit 7 at a specific cycle, thereby notifying the serviceman of the abnormal point. I do.

Here, first, if a short circuit or open accident occurs at a location other than the explosion prevention switch 6, that is, if an abnormality corresponding to the above-described second to sixth items occurs, the service person who has received the inspection request When the prevention switch 6 is once opened and then closed, as shown in FIGS. 2A to 2C, the alarm lamp 22 receives intermittent energization from the monitoring circuit 11 and blinks to indicate an abnormal point. repeat. Therefore, the serviceman can immediately identify the abnormal part by checking the blinking state of the alarm lamp 22 and collating it with the work manual. If an abnormal location is found, the ignition switch 8 is turned off, and then a failed element is replaced or a defective connection is repaired.

On the other hand, when an accident to open the explosion prevention switch 6 occurs, that is, when an abnormality corresponding to the first item occurs, an inspection request is received as shown in FIGS. 2 (D) to 2 (F). The alarm lamp 22 remains lit even if the service person once opened and subsequently closed the explosion prevention switch 6. For this reason, the warning lamp 22
The serviceman who sees the switch 6
After turning off the ignition switch 8, the explosion prevention circuit 6 can be repaired by replacing the explosion prevention switch 6 with a normal one.

As described above, the airbag device 21 can integrate the conventional warning lamp 12 and the abnormality notification lamp 13 into the warning lamp 22 so that the occupant of the vehicle can use the airbag 2 for the detonation circuit 7. When a circuit abnormality has occurred, the occurrence of the abnormality can be known by looking at the lit alarm lamp 22, and a service person who performs repairs at the request of the user can use the alarm lamp when operating the explosion prevention switch 6. By comparing the 22 blinking modes with the service manual, an abnormal location can be easily found. Also, since the blinking of the warning lamp 22 is linked to the explosion prevention switch 6 to the last, by hiding the explosion prevention switch 6, the general user can turn on or off the light in the same manner as other lamps. The user only touches the driven alarm lamp 22, and there is no danger that the user will see the blinking alarm lamp 22 and feel useless. In addition, the manufacturer can also enjoy the cost benefits associated with the omission of the abnormal location notification lamp 13, and further expel the assembling work of the abnormal location notification lamp 13 from the vehicle assembling process, thereby reducing the work efficiency by shortening the process. Can be improved.

In the above-described embodiment, the alarm lamp 22 may be configured to switch from a lighting state to an extinguishing state when a warning of an abnormality of the detonation circuit 7 is issued.

[Effects of the Invention] As described above, in the present invention, an alarm lamp connected to a monitoring circuit that monitors a circuit abnormality of an airbag detonation circuit is turned on or off when a circuit abnormality occurs, and a warning is issued. In addition, when the warning switch is turned on and the explosion prevention switch in the detonation circuit is once opened and then closed, the flashing drive is performed at a cycle peculiar to the abnormal location and the abnormal location is displayed. The warning lamp and the alarm lamp can be integrated with the alarm lamp, so that when a circuit abnormality occurs in the airbag detonation circuit, the vehicle occupant will see the warning lamp that lights up or goes out and sees the abnormality. A service technician who can detect the occurrence of an alarm and receives a warning from the alarm lamp and performs repairs operates the explosion prevention switch to support the blinking mode of the alarm lamp. By comparing it with the service manual, it is possible to easily find an abnormal location.Also, the blinking of the alarm lamp is linked to the explosion prevention switch only. As with the lamps, there is only contact with the alarm lamp which is driven in two ways, lighting or extinguishing, so that there is no fear that the user will see the blinking alarm lamp and have unnecessary fear. Either the manufacturer or the manufacturer can enjoy the cost benefits associated with the elimination of the abnormal location notification lamp, and at the same time, expel the assembling work of the abnormal location notification lamp from the vehicle assembly process, thereby improving work efficiency by shortening the process And so on.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the airbag device of the present invention, FIG. 2 is a signal waveform diagram of each part of the circuit shown in FIG. 1, and FIG. FIG. 3 is a circuit configuration diagram illustrating an example. 2. Airbag, 6 Explosion prevention switch, 7 Explosion circuit, 11 Monitoring circuit, 21 Airbag device, 22 Alarm lamp.

Claims (1)

(57) [Scope of request for utility model registration] 1. An airbag that explodes and inflates in an emergency to protect an occupant of a vehicle, a detonation circuit that is energized through an explosion prevention switch and detonates the airbag when an impact exceeding a certain limit is detected. A monitoring circuit for monitoring a circuit abnormality of the detonating circuit; and a warning circuit which is connected to the monitoring circuit and turns on or off when a circuit abnormality of the detonating circuit occurs to issue a warning. When the prevention switch is once opened and then closed, it receives an intermittent energization from the monitoring circuit, and is provided with an alarm lamp which is driven to blink at a cycle peculiar to an abnormal portion of the ignition circuit. Airbag device.