Air backup braking system and locomotive

Abstract

This invention relates to an air backup braking system and a locomotive. The system includes: a backup switching valve with two positions: normal and air position; a backup pressure regulating valve; a pressure measuring point; a backup brake valve with three positions: braking, neutral, and release; a backup equalizing pressure cylinder; and a backup relay valve, used to output its A2 port pressure in real time according to the pressure of the equalizing cylinder when the air backup mode is activated. Specifically, in the normal position of the backup switching valve, ports A2 and A3 of the backup switching valve are connected, cutting off the main air supply to the backup brake valve, venting the pressure at the control port C1 of the first, second, and third switching valves, and outputting a high-level signal. In the air position of the backup switching valve, ports A1 and A2 are connected, and the main air supply is simultaneously output through the pressure at port A2 to the control port C1 of the first, second, and third switching valves, and outputting a low-level signal. This invention solves the technical problem of the inability to switch in real time after a locomotive electro-pneumatic brake failure.

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