Patent ID: 7156025

Claim:
A method for controlling, without moving parts during operation, a burning pressure of a pyrotechnic composition used in a hybrid gas generator, the method comprising: providing a pressure vessel containing a pressurized gas comprising oxygen therein; arranging, within the pressure vessel, a combustion chamber containing the pyrotechnic composition; sealing a plurality of gas discharge openings between the combustion chamber and the pressure vessel, wherein each of the plurality of sealed gas discharge openings are dimensioned and designed to rupture in response to different burning pressures within the combustion chamber; controlling the burning pressure in the combustion chamber so that it does not exceed a predetermined value by progressively rupturing one or more of the plurality of sealed gas discharge openings; passing a combustion gas from the combustion chamber to the pressure vessel through one or more of the gas discharge openings, wherein, by controlling the burning pressure, a burning rate of the pyrotechnic composition is made to be independent of an ambient temperature.