| 摘要 |
The braking system comprises a pneumatic brake pipe (BP), which extends along the train, and in which the pressure is controlled by a braking control apparatus (BCA) in the locomotive (L), and an electrical power supply and signal line (EL), which equally extends along the train, and which is linked to an electronic control unit (ECU) in the locomotive. Moreover, in each wagon (W) there is: a pneumatic brake valve (ELV) coupled with the brake pipe (BP) and suitable for applying to brake cylinders (BC) of the wagon (W) a brake pressure that is a function of a control pressure applied to a control input (CI) thereof; and an electro-pneumatic control assembly (EPC) including: solenoid valve control devices (EVF, EVS), coupled with the brake pipe (BP) and with which a first pressure accumulator (DVE) is associated; the solenoid valve devices (EVF, EVS) being able to be selectively activated through signals sent through said line (EL) for applying a predetermined control pressure to the pneumatic brake valve (ELV); a pneumatic pressure modulator valve assembly (JMR) with a preloaded spring, with which a second pressure accumulator (DVP) is associated, and that is coupled with the brake pipe (BP) and is able to be connected to said control input (CI) of the pneumatic brake valve (ELV); and a selector device (SV; SEV; SPV) associated with the pneumatic brake valve (ELV) to couple its control input (CI) normally with the aforementioned solenoid valve devices (EVF, EVS), and to couple said control input (CI) with the pressure modulator assembly (JMR) when the pressure in the brake pipe (BP) falls below a predetermined value.
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