JPS60206753A - Explosion initiator to be mounted on car - Google Patents

Abstract

PURPOSE:To detect the abnormality at anytime irrespectively of the voltage fluctuation of power source mounted on a car by detecting the abnormality in detonator circuit through comparison of current against a dammy circuit. CONSTITUTION:When there is no disconnection nor shortcircuit in a detonator circuit 12, the resistances of said circuit 12 and a dammy circuit 13 will match to flow same currents in both circuits 12, 13 thus to produce zero outputs from comparison circuits 14, 15. Upon occurrence of disconnection in the detonator circuit 12, current will not flow through said circuit 12 to provide the output from the comparison circuit 14 to OR gate 16 thus to light an alarm lamp 17. While upon occurrence of shortcircuit in said circuit 12, the current level in the detonator circuit 12 will exceed over that in the dammy circuit 13 to light the alarm lamp 17 through the output from the comparison circuit 15.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to an on-vehicle detonator that prevents erroneous abnormality detection due to voltage fluctuations in an on-vehicle power source.

BACKGROUND ART In order to protect the occupants of a passenger car or the like from impact in the event of a collision, a passenger protection device has been proposed in which a gas-inflatable cushion is provided near the driver's seat or other seats. Generally, this type of occupant protection device has a gas generator containing a current-operated explosive, and the shock at the time of a collision detonates the gas generator and generates gas. The structure is such that a cushion is generated in front of the occupant and inflated to provide cushioning.

By the way, the detonator, called a squeezo, built into the detonator, which is designed to ignite when current exceeds a certain level, had been disconnected before the collision with the car. To ensure this, an anomaly detection circuit may be added.

FIG. 1 is a schematic configuration diagram showing an example of a conventional vehicle-mounted detonator equipped with an abnormality detection circuit. The vehicle-mounted detonator/detonator shown in the same figure is the detonator 30 at both ends of the gas generator λ equipped with a gas-expandable cushion 2a. , shock sensor, connected to the on-board power supply B via the spear, and configured to monitor the potential difference generated between both ends of the lightning cap 3 due to a minute current below the ignition current constantly flowing through the detonator 3 using a potentiometer in the abnormality detection circuit Z. It was said that However, the switch S that closes due to the impact shock
: lJ (impact sensor tag connected in 1 row to anti-R,!
Since the resistance value of the resistor R is sufficiently large compared to the resistor R6 of J・1q3 itself, the potential difference generated at both ends of the detonator 3 is extremely small. When the voltage of the Tojo power supply Otsu is fluctuating rapidly, such as when the lights are turned on, the voltage at both ends of the detonator 3 (
The trade difference also tends to fluctuate, which has the disadvantage that the abnormality detection circuit 7 itself may malfunction.

In addition, a comparison circuit (not shown) for comparing the output of the potentiometer installed in the samurai's damage detection circuit Z with the reference 11i3-
However, when operating from a stabilized power supply, there are drawbacks such as the above-mentioned ``drowsy'' voltage fluctuations are likely to be detected as irregularities.

DISCLOSURE OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks, and by connecting a dummy resistor circuit having the same resistance value in parallel to the detonator circuit and comparing the current values of both circuits, the current value in the detonator circuit can be determined. An object of the present invention is to provide a bomb detonator equipped with an abnormality detection circuit that can accurately detect abnormalities such as disconnections and short circuits. Then, the shock sensor whose resistance value changes,
A detonator circuit in which detonators are connected in series and ignites when a current exceeds a certain value? In a torpedo-mounted detonator configured such that a gas generator connected to a gas-inflatable cushion for passenger protection is detonated by the ignition of the detonator, the detonator has the same resistance value as the detonator circuit; +jQ was achieved by providing a dummy circuit with one concubine connected in parallel to the α circuit, and an abnormality detection circuit that compares the current flowing through this dummy circuit and the detonator circuit, and detects an abnormality if the current values do not match. The main points are as follows.

According to this invention, a dummy circuit with an equal resistance value is connected to a heavy pipe circuit in which a shock sensor whose resistance value changes when it senses a shock is connected in series with a current-operated whistle a, and a dummy circuit with an equal resistance value is connected to the
First, we designed a configuration to detect abnormalities such as disconnections or short circuits that occur in the detonator circuit under normal conditions by comparing the values of the current flowing through both circuits. It is possible to accurately detect the voltage of the T'A tube circuit regardless of the voltage fluctuation of the detonator, and to detect abnormalities in the detonator from the potential difference between the two ends of the detonator. There is no possibility of false detection due to voltage fluctuations, and as a result, when one machine occurs, it can ignite the heavy pipe and detonate it, which produces the desired effect.

BEST MODE FOR CARRYING OUT THE INVENTION A practical example of this invention will be explained with reference to FIG. FIG. 1 is a schematic diagram showing an embodiment of the bomb detonator of the present invention. In FIG. 2, the same components as in FIG. 1 are given the same reference numerals.

j'; 14-2 is 1, and tonhaiki 1 is a detonator circuit 1 which is a series connection circuit of 3, impact sensor tag, and j.
For 2, prepare a dummy circuit /3 equivalent to this, and install current detection circuits /ua, /, ? for both circuits and /3, respectively. a
It is configured by connecting the connected power supply in parallel to the on-board power supply B and selling it. Dummy circuit/3 is a resistor 1 which is the same as resistor R.
two resistors r with the same resistance value as the detonator 3; This is a direct depiction of Tsukiko N.

The outputs of both current detection circuits /2a and /3a are 2(
lI! The signal is supplied to the reference input terminal and the comparison input terminal of the comparator circuits /Q and /-Si of il, and difference calculations with opposite polarities are performed in the comparator circuits lμ and /3. The outputs of these comparison circuits/4°/S are supplied to the OR gate circuit 16,
The transistor Q is turned on by the output of the OR gate circuit/B, and the good news rung/7 is configured to light up.

In the case of this implementation column, current detection circuits 1.2a, 13a and comparison circuit/4! , /3. The OR gate circuit/6, alarm rung 77, etc. constitute the abnormality detection circuit/g.

Now, if there is no disconnection or short circuit in the detonator circuit t2,
In this case, the resistance values of detonator circuit/2 and dummy circuit/3 match, and naturally both circuits/2. ．． ．． The current values flowing through /3 are also equal, therefore, the comparator circuit /4! , /! ; are both in a state of zero output, and the abnormality detection circuit /g does not operate.

-10,000, detonator circuit/2. If a disconnection occurs in the detonator circuit 1
Since no direct current flows through 2, the output of the comparator circuit/q- is supplied to the OR gate circuit/B, and along with the transistor Q's ``Jm'', winter report rung/7 lights up, and an abnormality is detected. If a short circuit occurs in the detonator circuit/, 2,
The current value flowing through the detonator circuit 12 is TA of the dummy circuit/3.
In order to exceed the tt value, we will now use the comparator circuit/S.
Bill Lang/7 lights up due to the output, and an abnormality is detected.

In this way, the heavy detonator L/ is configured to detect an abnormality in the detonator circuit L by comparing the 1d current with the dummy circuit/3, so it will always detect an abnormality regardless of the voltage fluctuation of the onboard power supply B. can be detected accurately.

Also, comparison circuit/4. /,! ;1st prize for each/
By connecting 7 or a buzzer, it is possible to immediately detect whether the abnormality is caused by an interruption or a short circuit. By connecting a bias circuit or the like to the reference input side of <4./3, it is also possible to arbitrarily set the allowable value for the difference between the current signals to be compared.

As explained above, according to the on-board induction device//, the impact sensor Z changes its resistance value when it senses an impact.

A detonator circuit 12 in which the detonator j is connected in series to a current-operated detonator 3.
A dummy circuit /3 with the same resistance value is connected in parallel, and by comparing the values of 4ff and I' flowing through both circuits /l, /3, it is found that the detonator circuit l, ! Since it is configured to detect abnormalities such as disconnections or short circuits that occur within the tube circuit,
It is possible to accurately detect an abnormality in the detonator circuit/2 regardless of the voltage fluctuation of the on-board RLT source A connected to the dummy circuit 13. Like a detonator, a bandit is at the source.
Erroneous detection will not occur due to l'jf pressure fluctuations (thereby, the '1i tube 3 can be reliably ignited and detonated when an impact occurs.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an example of a conventional vehicle-mounted detonator, and FIG. 2 is a schematic configuration diagram showing an embodiment of the turret saw device of the present invention. β... Gas generator, 2a... Gas inflatable cushion, 3... Detonator, //... Flj-mounted detonator, /2
...Detonator circuit, /3...Dummy circuit, /, 2 a,
/3a ・-Current detection circuit, 7g. /S...Comparison circuit, /l...OR gate circuit, /
7...good news rung, 7g...yellow detection circuit. ] Permit applicant Japan'l (Ki Home Electronics Co., Ltd. 1st
Figure 2

Claims (1)

[Claims] The detonator circuit has a detonator circuit connected in series to an impact sensor whose resistance value changes when it detects an impact on a heavy vehicle, and a detonator that ignites when a current exceeds a certain value, and is connected to a gas-inflatable cushion to protect the occupants. In a vehicle-mounted detonator configured to be activated by the ignition of the Ai detonator,
A dummy circuit that has the same resistance value as the detonator circuit and is connected in parallel to the detonator circuit, and the current flowing through this dummy circuit and the detonator circuit are compared, and if the current values do not match, the number of abnormalities is determined. An on-vehicle detonator equipped with a detection circuit.