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

GF91.60-P-2011LE Deploying Of Pyrofuse, Function








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 onboard electrical system battery (G1) quickly from the on-board electrical system.

Function sequence for deploying pyrofuse in the event of a crash
The pyrotechnical separator (K88) is deployed after a crash event has occurred. The restraint systems control unit (N2/7) actuates the pyrotechnical separator directly.
Inside the housing of the pyrotechnical separator, the central line to the on-board electrical system battery is designed as a flat copper rail (3) with predetermined fracture point.

As the result of an electrically controlled pressure pulse (1), an insulated piston (2) located in the housing of the pyrotechnical separator moves against the predetermined fracture point and thereby cuts it quickly and reliably.







Deployment sequence:
- The deployment signal from the restraint systems control unit reaches the pyrotechnical separator and starts the deployment process (A).
- After t = 300 micros, the piston movement starts (B).
- After t = 450 micros, the busbar is cut (C)

The illustrated deployment sequence shows the function over time and clearly illustrates the speed advantage compared with conventional fuses.