COLLISION DETECTION SYSTEM AND FAILURE DETECTION METHOD

摘要

An outer panel and an inner panel of a vehicle door form a closed sealing chamber. A pressure sensor is attached to the inner panel to detect a pressure within the closed sealing chamber. The pressure sensor detects an increase in pressure caused by constriction of the closed sealing chamber when a collision occurs to a vehicle door. The in-vehicle speaker supplies a sound wave into the closed sealing chamber and detects, as an inspection pressure, a pressure in the closed sealing chamber when the sound wave is supplied. In an initial state of a vehicle, the inspection pressure is compared with an initial pressure threshold value, which is set based on a pressure in the closed sealing chamber generated when the sound wave is supplied. When the inspection pressure is equal to or lower than the initial pressure threshold value, it is detected that the air-tightness of the closed sealing chamber is lowered.

主权项

1. A collision detection system comprising:
a pressure sensor attached to face a closed sealing chamber formed in a vehicle door and detect an increase of pressure caused by constriction of the closed sealing chamber; a collision determination part for determining a collision of a vehicle when the pressure in the closed sealing chamber is detected as being equal to or higher than a collision threshold value; a sound wave supply part for supplying a sound wave into the closed sealing chamber; an initial pressure storage part for storing an initial pressure threshold value set in accordance with a pressure in the closed sealing chamber at the time of supply of the sound wave in an initial state of the vehicle; and a failure detection part for comparing an inspection pressure value in the closed sealing chamber detected at a time of supply of the sound wave into the closed sealing chamber with the initial pressure threshold value, and detecting a failure of the collision detection system when the inspection pressure is equal to or lower than the initial pressure threshold value.