Inflator second stage combustion control

An airbag system comprising:

• an airbag;
• an inflator comprising:
• a housing;
• a first chamber disposed within the housing;
• a generant cup and a cap disposed within the housing, the generant cup and the cap defining a second chamber that houses gas generant, the cap engaging the generant cup in seated engagement;
• one or more perforations located on the generant cup and the cap, wherein because of the position of the relative positions of both the cup and the cap, the one or more perforations on both the cap and the cup are sealed by the cap when the inflator is undeployed and actuation of gas generant in the second chamber unseals the one or more perforations permitting inflation gas to escape the second chamber without unseating the cap from the generant cup;
• and
• a sensor that detects the severity of an impact such that if the sensor detects that the severity of the impact is above a first threshold, the inflator actuates gas generant in the first chamber.