Patent ID: 7150469

Claim:
A method for controlling gas pressure for inflating a passenger-side frontal airbag in a vehicle, comprising: determining whether at least one passenger is resident in the passenger seat; determining a number of passengers and a current passenger type corresponding to the at least one passenger when at least one passenger is resident in the passenger seat, the current passenger type being selected from a plurality of predetermined passenger types; determining whether the number of the at least one passenger is not one; determining, in the case that the number of the at least one passenger is not one, whether a collision occurs; determining, in the case of a vehicle collision, whether the vehicle collision is a frontal collision; detecting, in the case of the frontal collision, a frontal impact generated from the vehicle collision; and adjusting the gas pressure for inflating the passenger-side frontal airbag on the basis of the current passenger type and the frontal impact generated from the collision; wherein when the current passenger type is a child only type, the adjusting the gas pressure comprises: determining whether the detected frontal impact is larger than a first predetermined impact (Im_ 1 ); and determining whether the detected frontal impact is larger than a second predetermined impact (Im_ 2 wherein Im_ 2 >Im_ 1 ), wherein when the detected frontal impact is not larger than the first predetermined impact the passenger-side airbag is not operated, wherein when the detected impact is larger than the first predetermined impact (Im_ 1 ) and is not larger than the second predetermined impact (Im_ 2 ) the gas pressure is formed to be 25% of a normal pressure (P_normal), and wherein when the detected impact is larger than the second predetermined impact (Im_ 2 ) the gas pressure is formed to be 50% of the normal pressure (P_normal).