Patent ID: 8626396

Claim:
A vehicular collision detection apparatus mounted to a vehicle comprising: a door beam that is arranged along a front-back direction of the vehicle in a partitioned region partitioned between a door outer panel of a vehicle door, and a door inner panel of the vehicle door, and is displaced along a width direction of the vehicle in accordance with a deformation of said door outer panel at the time of a vehicular collision; a cylinder wall that extends along the width direction of the vehicle between said door inner panel and said door beam in said partitioned region and is compressed along the width direction of the vehicle by said door beam at the time of the displacement of said door beam along the width direction of the vehicle; a folded portion of an accordion shape that guides the compression of said cylinder wall along the width direction of the vehicle at the time of displacement of said door beam; a cavity formed hermetically in said cylinder wall and that collapses along the width direction of the vehicle and decreases in volume at the time of the displacement of said door beam; a continuous portion arranged in said cylinder wall along the width direction of the vehicle; a pressure sensor arranged on one side from said continuous portion along the width direction of the vehicle configured to detect a pressure fluctuation due to the collapse of said cavity along the width direction of the vehicle via said continuous portion; a deriving portion configured to derive a displacement amount and displacement velocity of said door beam, based on the pressure fluctuation detected by said pressure sensor; and a determining portion configured to determine collision particulars of said vehicle based on the displacement amount and displacement velocity of said door beam derived by said deriving portion.