IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
|
출원번호 |
US-0420700
(2003-04-23)
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우선권정보 |
JP-2002-123641(2002-04-25); JP-2003-110594(2003-04-15) |
발명자
/ 주소 |
- Okamoto,Mitsuyasu
- Oda,Shingo
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출원인 / 주소 |
- Daicel Chemical Industries, Ltd.
|
대리인 / 주소 |
Birch, Stewart, Kolasch &
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인용정보 |
피인용 횟수 :
5 인용 특허 :
10 |
초록
▼
A method of determining a charging capacitance of a capacitor in an air bag system having an electronic control unit for controlling a gas generator, a bus line having a loop wire extending from the electronic control unit, gas generators connected to the loop wire, each gas generator having an igni
A method of determining a charging capacitance of a capacitor in an air bag system having an electronic control unit for controlling a gas generator, a bus line having a loop wire extending from the electronic control unit, gas generators connected to the loop wire, each gas generator having an igniter connected to the loop wire via a connector, one of the igniter and the connector being provided with an integrated circuit having the capacitor for providing power to a heat generating portion, a switching circuit for turning ON/OFF a supplying of current to the heat generating portion, and a microcomputer unit for controlling the switching circuit, the method including, determining a minimum charging capacitance of the capacitor necessary to operate the igniter based on a charging voltage and a minimum ignition energy required for making the heat generating portion of the igniter generate heat to ignite the priming.
대표청구항
▼
The invention claimed is: 1. A method of determining a charging capacitance of a capacitor in an air bag system having an electronic control unit for controlling activation of a gas generator, a bus line having a loop wire extending from the electronic control unit, a plurality of gas generators co
The invention claimed is: 1. A method of determining a charging capacitance of a capacitor in an air bag system having an electronic control unit for controlling activation of a gas generator, a bus line having a loop wire extending from the electronic control unit, a plurality of gas generators connected to the loop wire, each gas generator having an igniter connected to the loop wire via a connector, one of the igniter and the connector being provided with an integrated circuit having, the capacitor for providing power to a heat generating portion for igniting a priming, a switching circuit for turning ON/OFF a supplying of current to the heat generating portion, and a microcomputer unit for controlling the switching circuit, the method comprising: determining a minimum charging capacitance of the capacitor necessary to operate the igniter by the following formula (I): description="In-line Formulae" end="lead"C= 2E/V2 (I)description="In-line Formulae" end="tail" where, C represents a capacitor charging capacitance, V represents a charging voltage, and E represents a minimum ignition energy required for making the heat generating portion of the igniter generate heat to ignite the priming, the minimum ignition energy being obtained by the following formula (II): description="In-line Formulae" end="lead"E=I min2'(Rmax+r1+r2)'T+w'10 (II)description="In-line Formulae" end="tail" where, Imin: a minimum ignition current value (A), Rmax: a maximum resistance value of the heat generating portion (W), r1: a maximum ON resistance value of the switching circuit at 150째 C.(W), r2: a resistance value of elements other than the switching circuit (W), T: a time period in which a current flows in the heat generating portion (sec), and w: a power consumed by an entire integrated circuit when the switching circuit is OFF, and where 10 in w'10 is a maximum time period elapsed from a first collision to a second collision which may occur during a vehicle collision. 2. A method of determining a charging capacitance of a capacitor in an air bag system, comprising: providing an electronic control unit for controlling activation of an igniter; providing a bus line having a loop wire extending from the electronic control unit; providing a plurality of gas generators connected to the loop wire, each gas generator having, an igniter connected to the loop wire via a connector, one of the igniter and the connector being provided with an integrated circuit having, the capacitor for providing power to a heat generating portion for igniting a priming, a switching circuit for turning ON/OFF a supplying of current to the heat generating portion, and a microcomputer unit for controlling the switching circuit; and determining a minimum charging capacitance of the capacitor necessary to operate the igniter by the following formula (I): description="In-line Formulae" end="lead"C= 2E/V2 (I)description="In-line Formulae" end="tail" where, C represents a capacitor charging capacitance, V represents a charging voltage, and E represents a minimum ignition energy required for making the heat generating portion of the igniter generate heat to ignite the priming, the minimum ignition energy being obtained by the following formula (II): description="In-line Formulae" end="lead"E=I min2'(Rmax+r1+r2)'T+w'10 (II)description="In-line Formulae" end="tail" where, Imin: a minimum ignition current value (A), Rmax: a maximum resistance value of the heat generating portion (W), r1: a maximum ON resistance value of the switching circuit at 150째 C.(W), r2: a resistance value of elements other than the switching circuit (W), T: a time period in which current flows in the heat generating portion (sec), and w: a power consumed by an entire integrated circuit when the switching circuit is OFF, and where 10 in w'10 is a maximum time period elapsed from a first collision to a second collision which may occur during a vehicle collision.
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