Controlling deployment of air-bag body of head-protection air-bag device

A head-protection air-bag device having an air-bag body, comprising:

• at least one inflator for holding gas and that injects gas to the air-bag body;
• a side-collision sensor that detects side collision of the vehicle;
• a rollover sensor that detects rollover of the vehicle;
• and
• a control circuit operatively connected to the at least one inflator and the side-collision sensor for causing the at least one inflator to inject gas at of a first pressure or a second pressure lower than the first pressure from the inflator, wherein the first pressure is provided when the side-collision sensor detects a side collision, and wherein the second pressure is provided when the rollover sensor detects a rollover.

A head-protection air-bag device having an air-bag body, comprising:

• at least one inflator for holding gas and that injects gas to the air-bag body;
• a side-collision sensor that detects side collision of the vehicle;
• a rollover sensor that detects rollover of the vehicle;
• and
• a control circuit operatively connected to the at least one inflator, the side-collision sensor and the rollover sensor, wherein a first time for an internal pressure of the air-bag body to reach a peak value by the injected gas from the at least one inflator when the side-collision sensor detects side collision is less than a second time for an internal pressure of the air-bag body to reach a peak value by the injected gas from the at least one inflator when the rollover sensor detects rollover.