On the site of vehilce fire, a lot of damage have occurred by fuel of vehicle, long time for opening of hood, and late cognition of fire. If person in the vehicle perceive the signs of fire in the enginroom at the beginning of fire incident, the damage will be reduced. And if firefighter can open the hood damaged by fire earlier, the fire may also be suppressed.
So I suggest automatic opening of hood by detection of fire in the enginroom. The principle of the detection is conducted by temperature sensors on the underside of hood. The electromagnetic locks of hood is released automatically by signals transmitted from the detection of fire which exceed the limit of temperature.