Pressure controlling device for locomotive equalizing reservoir

The utility model discloses a pressure controlling device for locomotive equalizing reservoir, including a closed-loop master control part and a back-up control part. The closed-loop master control part includes: a pressure sensor accessing in the equalizing reservoir, an air-intake branch formed by connecting in series a control plug door connected to the total wind output port, a pressure regulating valve, an air-intake high speed electro-pneumatic valve and a switch valve of the accessing equalizing reservoir in sequence, an air exhaust branch composed of an air exhaust high speed electro-pneumatic valve and a switch valve of the accessing equalizing reservoir, and a proportional controller, wherein the air-intake high speed electro-pneumatic valve and the air exhaust high speed electro-pneumatic valve are respectively connected to the control terminal of the proportional controller; the signal input terminal of the proportional controller is connected to the output terminal of the pressure sensor. The back-up control part includes a control plug door connected to the total wind output port, a pressure regulating valve, and a back-up brake valve accessing to the equalizing reservoir that are connected in series in sequence. The utility model performs closed-loop control to the equalizing reservoir pressure, whish has high control precision; adopts redundant control to the pressure of the equalizing reservoir, to improve the control reliability; the equalizing reservoir can perform automatic pressure reduction and wind discharging to perform automatic protection when system fault appears or the electricity is cut off, the locomotive safety can be improved, and the like advantages.