Fire extinguishing system for vehicle

A fire extinguishing system for a vehicle, comprising:

• a fire sensing line arranged in a predetermined space of the vehicle to output a fire sensing signal as an electrical signal when a fire is sensed;
• a controller configured to output a control signal for spraying a fire extinguishing agent when the fire sensing signal from the fire sensing unit is input;
• a fire extinguishing agent cylinder configured to be operated to discharge the fire extinguishing agent filling an inside of the fire extinguishing agent cylinder in response to the control signal outputted from the controller;
• and
• a spray nozzle assembly arranged in the predetermined space of the vehicle and configured to spray the fire extinguishing agent supplied from the fire extinguishing agent cylinder through a fire extinguishing agent hose,
• wherein the fire sensing line comprises:
• a tube comprising a first hollow part and a second hollow part extending in a length direction of the tube;
• two electrically conductive wires disposed along the first hollow part to be respectively covered with a covering material to be electrically isolated from each other, and configured to be short-circuited when external current is applied thereto and configured to input a short-circuit signal as the fire sensing signal to the controller;
• a coil configured to receive current from the controller, and arranged in the length direction of the tube inside or outside the tube;
• a magneto-rheological (MR) fluid configured to fill an inside of the sealed second hollow part of the tube;
• and
• an outer conduit disposed to surround the tube.