Integrated circuit for air bag system
First Claim
1. An air bag system provided with a plurality of gas generators, comprising:
- an electronic control unit connected to a power source and an impact detecting sensor;
bus lines including a plurality of loop wires which pass through the electronic control unit, the loop wires supplying and transmitting currents and information; and
a plurality of igniters operationally connected to the bus lines at predetermined portions of the bus lines, said plurality of igniters including an igniter provided with a heat generating portion, a priming in contact with the heat generating portion, an integrated circuit, and a capacitor through which a current is supplied to the heat generating portion for igniting the priming,wherein, the current from the capacitor is supplied to the heat generating portion for a time period starting from a point where the current reaches a value corresponding to 5% of the maximum current value to a point where the current reduces to a value corresponding to 5% of the maximum current value, which is within 500 μ
sec.
1 Assignment
0 Petitions
Accused Products
Abstract
An integrated circuit for an air bag system is used in an air bag system having an ECU and a module case connected to the ECU and accommodating a gas generator and an air bag. In the air bag system, two bus lines passing through the ECU are provided to supply currents and the like, and individual gas generators accommodated in the module cases are connected operationally by conductors branched from the bus lines. Each of the igniters incorporated in the gas generator is an electric igniter which is provided with a heat generating portion and a priming coming in contact with the heat generating portion, and the igniter and the bus line are connected to each other through the conductors, and the integrated circuit provided in the igniter is recorded with information to exhibit required functions, and a current for igniting the priming is supplied to the igniters through a capacitor.
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Citations
20 Claims
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1. An air bag system provided with a plurality of gas generators, comprising:
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an electronic control unit connected to a power source and an impact detecting sensor; bus lines including a plurality of loop wires which pass through the electronic control unit, the loop wires supplying and transmitting currents and information; and a plurality of igniters operationally connected to the bus lines at predetermined portions of the bus lines, said plurality of igniters including an igniter provided with a heat generating portion, a priming in contact with the heat generating portion, an integrated circuit, and a capacitor through which a current is supplied to the heat generating portion for igniting the priming, wherein, the current from the capacitor is supplied to the heat generating portion for a time period starting from a point where the current reaches a value corresponding to 5% of the maximum current value to a point where the current reduces to a value corresponding to 5% of the maximum current value, which is within 500 μ
sec. - View Dependent Claims (2, 3)
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4. An air bag system provided with a plurality of gas generators, comprising:
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an electronic control unit connected to a power source and an impact detecting sensor; bus lines including a plurality of loop wires which pass through the electronic control unit, the loop wires supplying and transmitting currents and information; and a plurality of igniters operationally connected to the bus lines at predetermined portions of the bus lines, each of the plurality of igniters being provided with a heat generating portion, a priming in contact with the heat generating portion, an integrated circuit, a capacitor, through which a current is supplied to the heat generating portion for igniting the priming, the integrated circuit detecting abnormality of the heat generating portion, the abnormality including at least one of a disconnection, a loose contact between the heat generating portion and the priming, and abnormality of a resistance value of the heat generating portion, said each of the plurality of igniters further including a discharging waveform converting circuit which converts a signal waveform of the current, for igniting the priming, stored in the capacitor.
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5. An air bag system provided with a plurality of gas generators, comprising:
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an electronic control unit connected to a power source and an impact detecting sensor; bus lines including a plurality of loop wires which pass through the electronic control unit, the loop wires supplying and transmitting currents and information; and a plurality of igniters operationally connected to the bus lines at predetermined portions of the bus lines, each of the plurality of igniters being provided with a heat generating portion, a priming in contact with the heat generating portion, an integrated circuit, a capacitor through which a current is supplied to the heat generating portion for igniting the priming, and a discharging waveform converting circuit which converts a signal waveform of the current, for igniting the priming, stored in the capacitor.
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6. An air bag system provided with a plurality of gas generators, comprising:
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an electronic control unit connected to a power source and an impact detecting sensor; bus lines including a plurality of loop wires which pass through the electronic control unit, the loop wires supplying and transmitting currents and information; and a plurality of igniters operationally connected to the bus lines at predetermined portions of the bus lines, said plurality of igniters including an igniter provided with a substrate, a heat generating portion and a priming in contact with the heat generating portion, and an integrated circuit that detects abnormality of the heat generating portion, the abnormality including at least one of a disconnection, a loose contact between the heat generating portion and the priming, and abnormality of a resistance value of the heat generating portion, the heat generating portion, the integrated circuit, and a capacitor, through which current is supplied to the heat generating portion for igniting the priming, being mounted directly on a single surface of the substrate, wherein the integrated circuit is disposed between the heat generating portion and the capacitor. - View Dependent Claims (7)
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8. An air bag system provided with a plurality of gas generators, comprising:
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an electronic control unit connected to a power source and an impact detecting sensor; bus lines including a plurality of loop wires which pass through the electronic control unit, the loop wires supplying and transmitting currents and information; and a plurality of igniters operationally connected to the bus lines at predetermined portions of the bus lines, said plurality of igniters including an igniter provided with a substrate, a heat generating portion and a priming in contact with the heat generating portion, and including an integrated circuit that stores information used by the electronic control unit to identify respective gas generators, the heat generating portion, the integrated circuit, and the capacitor being mounted directly on a single surface of the substrate, wherein the integrated circuit is disposed between the heat generating portion and the capacitor. - View Dependent Claims (9, 10)
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11. An air bag system provided with a plurality of gas generators, comprising:
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an electronic control unit connected to a power source and an impact detecting sensor; bus lines including a plurality of loop wires which pass through the electronic control unit, the loop wires supplying and transmitting currents and information; and a plurality of igniters operationally connected to the bus lines at predetermined portions of the bus lines, said plurality of igniters including an igniter provided with a substrate, a heat generating portion, a priming in contact with the heat generating portion, an integrated circuit, and a capacitor through which a current is supplied to the heat generating portion for igniting the priming, and detecting a malfunction of the capacitor, the heat generating portion, the integrated circuit, and the capacitor being mounted directly on a single surface of the substrate, wherein the integrated circuit is disposed between the heat generating portion and the capacitor. - View Dependent Claims (12, 14, 15)
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13. An air bag system provided with a plurality of gas generators, comprising:
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an electronic control unit connected to a power source and an impact detecting sensor; bus lines including a plurality of loop wires which pass through the electronic control unit, the loop wires supplying and transmitting currents and information; and a plurality of igniters operationally connected to the bus lines at predetermined portions of the bus lines, said plurality of igniters including an igniter provided with a substrate, a heat generating portion, a priming in contact with the heat generating portion, an integrated circuit, and a capacitor, through which a current is supplied to the heat generating portion for igniting the priming, the heat generating portion, the integrated circuit, and the capacitor being mounted directly on at least one of surfaces of the substrate, wherein the integrated circuit and the heat generating portion are mounted on a first surface of the substrate, and the capacitor is mounted on a second surface of the substrate opposite to the first surface. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification