This system is designed to detect the presence of a passenger in the front seat. In the absence of a passenger, the system prevents useless deployment of the airbag in the event of an accident. The main element of the system is the load sensor.
Sensor sensitivity threshold: loaded - more than 15 kg, no load - 0.6 kg. Sensor characteristics:
at load > 15 kg resistance < 50 kOhm;
at load < 0.6 kg resistance > 50 kΩ.
Pic. 8.45. Front seat occupant detection system (PPD)