DEVICE AND METHOD FOR TRAIN LENGTH DETERMINATION Russian patent published in 2015 - IPC B60L15/00 

FIELD: transport.

SUBSTANCE: invention relates to railway ACS and telemetry systems. Train consists of multiple cars to be braked by air-driven brake system with the primary air duct. This train incorporates the device for train length determination with the help of said brake system with allowance of pressure in primary air duct extending through all cars. Braking is executed at several steps while train length is defined proceeding from measured pressure values, flow rate, and ambient air temperature (T) performed by sensors arranged along arbitrary axis with the help of electronic processing system. Note here that registration of said parameters is performed starting from steady state of active braking step (I) during execution of the next braking step (II) unless attainment of steady state. Then, flow rate integration ( $$\dot{V}$$ ) is performed during air release from said primary air duct to perform the nest braking step (II) with allowance for dominating pressure in initial and final conditions and ambient temperature (T) so that the volume of primary air duct can be calculated. Then, know cross-section of the main air duct (HL) is applied to define its length to comply with that of the train.

EFFECT: higher accuracy of determination.

10 cl, 2 ex