GF91.60-P-2011FQ Deploying of Pyrofuse, Function

GF91.60-P-2011FQ Deploying of Pyrofuse, Function
MODEL 218

Function requirements, general
^ Circuit 15R ON

Deploying a pyrofuse, general
To avoid any possible fire hazard following a crash event, it is necessary to disconnect the starter (M1) and alternator (G2) quickly and reliably from the on-board electrical system.

The status of circuit 15R is sent by the electronic ignition lock control unit (N73) via chassis CAN (CAN E) to the supplemental restraint system control unit (N2/10).





Function sequence for triggering the pyrofuse
The central line to the starter and to the alternator is designed as bus bar with predetermined fracture point (3) inside the pyrofuse housing.
After a crash, the pyrofuse 150 (F32f150) (without code (B03) ECO start/stop function) or the pyrofuse (F63) (with code (B03) ECO start/stop function) is actuated directly by the Supplemental Restraint System control unit.
When the pyrofuse is actuated, pressure builds up in the chamber (1). The piston (2) then moves against the predetermined fracture point disconnecting the bus bar.

Time sequence:
After t = 300 s, the piston movement starts.
After t = 450 s, the separation of the line rail is complete.