초록 ▼

A passenger detection system comprises an antenna electrode which is provided to the dashboard of a car, an oscillation circuit for generating a high frequency low voltage oscillation signal in order to generate a weak alternating electric field around the antenna electrode, a current detection sect

A passenger detection system comprises an antenna electrode which is provided to the dashboard of a car, an oscillation circuit for generating a high frequency low voltage oscillation signal in order to generate a weak alternating electric field around the antenna electrode, a current detection section for detecting a transmission current which passes between the oscillation circuit and the antenna electrode depending on the weak alternating electric field which is generated around the antenna electrode, a phase difference detection section for detecting the phase difference between the oscillation signal supplied from the oscillation circuit and an output signal which is supplied to the antenna electrode, and a control circuit for judging the presence or absence of a passenger seated on the seat based on the detected phase difference and judging the distance between the passenger and the dashboard based on the detected transmission current. The passenger detection system is connected with an air bag unit, and the air bag unit is set at a `no deployment mode` if it is judged that no passenger is seated on the seat or the distance between the passenger and the dashboard is less than a minimum allowable distance, thereby the passenger who is close to the dashboard is protected from secondary injury due to strong deployment of the air bag.

대표청구항 ▼

[ What is claimed is:] [1.]1. A passenger detection system comprising:an antenna electrode which is provided to a portion of a vehicle located in front of a seat of a vehicle so as to face a passenger seated on the seat and generates an electric field between the antenna electrode and the passenger;

[ What is claimed is:] [1.]1. A passenger detection system comprising:an antenna electrode which is provided to a portion of a vehicle located in front of a seat of a vehicle so as to face a passenger seated on the seat and generates an electric field between the antenna electrode and the passenger;an oscillation means electrically connected to the antenna electrode, said oscillation means generating a high frequency low voltage oscillation signal in order to generate a weak electric field around the antenna electrode;a current detection means for detecting a current which passes between the oscillation means and the antenna electrode depending on disturbance in the electric field between the antenna electrode and the passenger; anda judgment means for judging a distance between the passenger and the portion of the vehicle based on the current detected by the current detection means.