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

GF91.60-P-2011CA Deploying of pyrofuse, function

Function requirements, general
^ Circuit 15R ON

The electronic ignition control unit transmits the circuit status of circuit 15 (N73) via chassis CAN (CAN E) to the supplement 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 busbar 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 busbar.

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

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