1. A helmet airbag system, comprising: an inflation device configured to inflate an airbag coupled to a helmet; a ventilation device configured to deflate the airbag; a processing circuit configured to: receive object data regarding at least one of an actual impact and a predicted impact between the helmet and an object; and control operation of the ventilation device and the inflation device to control at least one of a deflation rate and an inflation rate of the airbag based on the object data; and a retraction device configured to retract the airbag.