An automotive hood hinge assembly is adapted to act as a safety device in
the event of a collision with a pedestrian. The hood hinge assembly is
constructed from a series of linkages and an energy storage actuator that
is configured to raise the rear of a vehicle hood in response to a
pedestrian collision. The deployed system forms a rigid structure that
restrains rearward movement of the hood while providing a vertical motion
path and resistive force capable of efficiently dissipating the energy
imparted by the pedestrian and therefore significantly lowering injury
levels. The linkages are configured to provide conventional rotary
opening and closing motion of the hood when the system is in the
retracted position and also provide a reset function so that a simple
opening and closing motion of the hood when the system is in the deployed
position resets it to the retracted position.