초록 ▼

The present invention provides a method of reducing an amount of NOx generated in actuation of a hybrid inflator. The present invention is a method of reducing nitrogen oxide which is generated in actuation of a hybrid inflator for an inflatable safety system of a vehicle provided with an airbag, th

The present invention provides a method of reducing an amount of NOx generated in actuation of a hybrid inflator. The present invention is a method of reducing nitrogen oxide which is generated in actuation of a hybrid inflator for an inflatable safety system of a vehicle provided with an airbag, the inflator comprising an inflator housing charged with a pressurized medium, a gas generator which is accommodated in the inflator housing and has one or two or more gas generating chambers storing a gas generating agent including a fuel and an oxidizing agent, and an igniting means connected to the gas generator, wherein a reducing compound having at least a reducing function of a nitrogen oxygen is placed in the hybrid inflator.

대표청구항 ▼

The invention claimed is: 1. A method of reducing nitrogen oxide generated upon actuation of a hybrid inflator for an inflatable safety system of a vehicle provided with an airbag including an inflator housing charged with a pressurized medium, a gas generator which is accommodated in the inflator

The invention claimed is: 1. A method of reducing nitrogen oxide generated upon actuation of a hybrid inflator for an inflatable safety system of a vehicle provided with an airbag including an inflator housing charged with a pressurized medium, a gas generator which is accommodated in the inflator housing and has at least one gas generating chamber, and an igniting means connected to the gas generator for generating a combustion product, comprising: providing in the gas generating chamber a tubular member including a plurality of flame transferring holes disposed axially and circumferentially about said tubular member, said tubular member defining therein a charge transferring chamber; providing in the gas generating chamber a body of gas generating agent including a fuel and an oxidizing agent; providing within the gas generating chamber a body of reducing compound capable of reducing nitrogen oxide that is separate from the body of gas generating agent such that the body of reducing compound and the body of gas generating agent are located together adjacent said tubular member and directly facing the plurality of flame transferring holes, and introducing the combustion product into the gas generating chamber. 2. The method of reducing nitrogen oxide according to claim 1 comprising: mixing the body of gas generating agent and the body of the reducing compound in said gas generating chamber. 3. The method of reducing nitrogen oxide according to claim 1, wherein the step of providing the body of reducing compound includes: providing the body of reducing compound including at least one member selected from the group consisting of amide, guanidine derivatives, tetrazole derivatives, hydrazine derivatives, triazine derivatives, hydroxylamine salts, sodium salts, ammonium salts, amine complexes, cyanates and dicyanamide salts. 4. The method of reducing nitrogen oxide according to claim 1, wherein the step of providing the body of reducing compound includes providing the body of reducing compound including azodicarbonamide, dicyandiamide, 5-aminotetrazole or its salt, or bitetrazole or its salt. 5. The method of reducing nitrogen oxide according to claim 1, wherein said step of providing the body of reducing compound includes providing the body of reducing compound which is present in an amount of 0.1 to 30 parts by weight on the basis of 100 parts by weight of the fuel. 6. The method of reducing nitrogen oxide of a hybrid inflator according to claim 1, wherein at least one of the following requirements (1) to (3) are met: (1) a mole ratio of an amount (A mole) of the pressurized medium and an amount (B mole) of gas generated by combustion of the body of gas generating agent being 8/2 to 1/9; (2) the weight ratio (X/Y) of a weight (X) of the pressurized medium and a weight (Y) of the body of gas generating agent being 0.1 to 7; and (3) the pressure index defined by the following formula at a time of combustion of the body of gas generating agent being less than 0. 8: rb =αpn wherein in the formula, rb denotes burning rate, α denotes coefficient, p denotes pressure, and n denotes pressure index. 7. A hybrid inflator for an inflatable safety system of a vehicle provided with an airbag, comprising: an inflator housing charged with a pressurized medium; a gas generator accommodated in the inflator housing and having at least one gas generating chamber and including a body of gas generating agent; a tubular member including a plurality of flame transferring holes disposed both axially and circumferentially about said tubular member and provided within the gas generating chamber; igniting means connected to the gas generator and generating a combustion product into the gas generating chamber through the plurality of flame transferring holes in said tubular member; and a body of reducing compound capable of reducing nitrogen oxide separate from the body of gas generating agent provided within the at least one gas generating chamber such that the body of reducing compound and the body of gas generating agent are located together in said at least one gas generating chamber adjacent said tubular member and directly facing the plurality of flame transferring boles. 8. A hybrid inflator according to claim 7, wherein a mixture of the body of gas generating agent and the body of reducing compound are placed in said gas generating chamber. 9. A hybrid inflator according to claim 7, wherein the body of reducing compound is comprised of at least one member selected from the group consisting of amide, guanidine derivatives, tetrazole derivatives, hydrozine derivatives, triazine derivatives, hydroxylamine salts, sodium salts, ammonium salts, amine complexes, cyanates and dicyanamide salts. 10. A hybrid inflator according to claim 7, wherein the body of reducing compound comprises azodicarbonamide, dicyandiamide, 5-aminotetrazole or its salt, or bitetrazole or its salt. 11. A hybrid inflator according to claim 7, wherein said body of reducing compound is present in an amount of 0.1 to 10 parts by weight on the basis of 100 parts by weight of the fuel. 12. A hybrid inflator according to claim 7, wherein at least one of the following requirements (1) to (3) are met: (1) a mole ratio of an amount (A mole) of the pressurized medium and an amount (B mole) of gas generated by combustion of the body of gas generating agent being 8/2 to 1/9; (2) the weight ratio (X/Y) of a weight (X) of the pressurized medium and a weight (Y) of the body of gas generating agent being 0.1 to 7; and (3) the pressure index defined by the following formula at a time of combustion of the body of gas generating agent being less than 0. 8: rb =αpn wherein in the formula, rb denotes burning rate, α denotes coefficient, p denotes pressure, and n denotes pressure index. 13. A method of reducing nitrogen oxide generated upon actuation of a hybrid inflator for an inflatable safety system of a vehicle provided with an airbag including an inflator housing charged with a pressurized medium, a gas generator which is accommodated in the inflator housing and has at least one gas generating chamber, and an igniting means connected to the gas generator for generating a combustion product, comprising: providing at least one port for passing the combustion product therethrough into the at least one gas generating chamber; providing in the gas generating chamber a body of gas generating agent including a fuel and an oxidizing agent such that the body of gas generating agent directly faces said at least one port; providing within the gas generating chamber a body of reducing compound capable of reducing nitrogen oxide that is separate from the body of gas generating agent and is positioned such that the body of reducing compound directly faces said at least one port, and causing said combustion product to pass into the gas generating chamber through said at least one port into direct contact with each said gas generating agent and said reducing compound. 14. The method of reducing nitrogen oxide according to claim 13 comprising: mixing the body of gas generating agent and the body of the reducing compound in said gas generating chamber. 15. The method of reducing nitrogen oxide according to claim 13, wherein the step of providing the body of reducing compound includes: providing the body of reducing compound including at least one member selected from the group consisting of amide, guanidine derivatives, tetrazole derivatives, hydrazine derivatives, triazine derivatives, hydroxylamine salts, sodium salts, ammonium salts, amine complexes, cyanates and dicyanamide salts. 16. The method of reducing nitrogen oxide according to claim 13, wherein the step of providing the body of reducing compound includes providing the body of reducing compound including azodicarbonamide, dicyandiamide, 5-aminotetrazole or its salt, or bitetrazole or its salt. 17. The method of reducing nitrogen oxide according to claim 13, wherein said step of providing the body of reducing compound includes providing the body of reducing compound which is present in an amount of 0.1 to 30 parts by weight on the basis of 100 parts by weight of the fuel. 18. The method of reducing nitrogen oxide of a hybrid inflator according to claim 13, wherein at least one of the following requirements (1) to (3) are met: (4) a mole ratio of an amount (A mole) of the pressurized medium and an amount (B mole) of gas generated by combustion of the body of gas generating agent being 8/2 to 1/9; (5) the weight ratio (X/Y) of a weight (X) of the pressurized medium and a weight (Y) of the body of gas generating agent being 0.1 to 7; and (6) the pressure index defined by the following formula at a time of combustion of the body of gas generating agent being less than 0. 8: rb =αn wherein in the formula, rb denotes burning rate, α denotes coefficient, p denotes pressure, and n denotes pressure index. 19. A hybrid inflator for an inflatable safety system of a vehicle provided with an airbag, comprising: an inflator housing charged with a pressurized medium; a gas generator accommodated in the inflator housing and having at least one gas generating chamber defining therein a single space; igniting means connected to the gas generator and generating a combustion product into the gas generating chamber; and at least one port provided within the gas generator for the combustion product to pass therethrough into the gas generating chamber; a body of gas generating agent provided within the at least one gas generating chamber such that the body of gas generating agent directly faces said at least one port and the combustion product is in direct contact with the body of gas generating agent; a body of reducing compound capable of reducing nitrogen oxide that is separate from the gas generating agent provided within the at least one gas generating chamber and is positioned such that the body of reducing compound directly faces said at least one port and the combustion product is in direct contact with the body of reducing compound. 20. A hybrid inflator according to claim 19, wherein a mixture of the body of gas generating agent and the body of reducing compound are placed in said gas generating chamber. 21. A hybrid inflator according to claim 19, wherein the body of reducing compound is comprised of at least one member selected from the group consisting of amide, guanidine derivatives, tetrazole derivatives, hydrozine derivatives, triazine derivatives, hydroxylamine salts, sodium salts, ammonium salts, amine complexes, cyanates and dicyanamide salts. 22. A hybrid inflator according to claim 19, wherein the body of reducing compound comprises azodicarbonamide, dicyandiamide, 5-aminotetrazole or its salt, or bitetrazole or its salt. 23. A hybrid inflator according to claim 19, wherein said body of reducing compound is present in an amount of 0.1 to 10 parts by weight on the basis of 100 parts by weight of the fuel. 24. A hybrid inflator according to claim 19, wherein at least one of the following requirements (1) to (3) are met: (4) a mole ratio of an amount (A mole) of the pressurized medium and an amount (B mole) of gas generated by combustion of the body of gas generating agent being 8/2 to 1/9; (5) the weight ratio (X/Y) of a weight (X) of the pressurized medium and a weight (Y) of the body of gas generating agent being 0.1 to 7; and (6) the pressure index defined by the following formula at a time of combustion of the body of gas generating agent being less than 0. 8: rb =αpn wherein in the formula, rb denotes burning rate, α denotes coefficient, p denotes pressure, and n denotes pressure index.