TIRE EXCITATION CIRCUIT FOR FIRE ALARM SYSTEM AND FIRE ALARM SYSTEM Russian patent published in 2016 - IPC G08B17/00 G08B29/06 

FIELD: motor car construction.

SUBSTANCE: claimed invention discloses the alarm signalling system excitation circuit and process. Excitation circuit comprises current generation circuit configured for selective feed of either the first current I_N1 or second current I_emergent to the bus. Note here that the first current I_N1 is used as the tire comprehensive control at normal working state. Note also that second current I_emergent is higher than the first current I_N1. It comprises the detection circuit designed to control the current generation circuit to feed the second current I_emergent to the bus when the bus voltage V_bus is found to be smaller than the threshold V_thresh. Note here that the threshold V_thresh is lower than the bus normal voltage but higher than the maximum emergency voltage specified in the bus when automatic fire annunciator outputs the alarm signal.

EFFECT: reduced power consumption.

14 cl, 9 dwg