Brake release control circuit and control method of metro vehicle brake system

Abstract

The invention discloses a brake release control circuit and control method of a metro vehicle brake system, the brake release control circuit comprises an EBCU power control line and a relay, the relay comprises a coil K1 and a conversion type contact group; the coil K1 is connected between a positive electrode and a negative electrode of an EBCU power supply through an EBCU power supply control line, a movable contact of the conversion type contact group is connected with a brake release signal output interface, a first static contact of the conversion type contact group is connected with a signal output interface of the EBCU, and a second static contact of the conversion type contact group is connected with an emergency loop power supply signal output interface; and when the coil K1 is not electrified, the movable contact of the conversion type contact group is normally closed at the second static contact. According to the invention, the EBCU can output correct brake release signals under the conditions of normal operation and abnormal fault power loss, and rescue accidents caused by abnormal traction blocking are avoided.

Description

technical field [0001] The invention relates to the technical field of metro vehicle brake system control, in particular to a control circuit and a control method that are suitable for correctly outputting brake relief signals during normal operation and when an electronic brake control unit fails. Background technique [0002] The braking system of subway vehicles is generally controlled by rack control. Each vehicle is equipped with two braking control units, which include electronic braking control unit (EBCU) and pneumatic braking control unit (PBCU). The EBCU receives external control signals, controls the relevant valve actions of the PBCU to perform vehicle braking and release, and at the same time outputs corresponding electrical signals to the vehicle control system (TCMS) for traction and braking control of the entire train. Under normal circumstances, when the EBCU collects that the brake cylinder pressure of the current bogie is less than 25kPa, it judges that th...

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Problems solved by technology

[0003] In order to solve the problem that the brake release signal output by the EBCU does not match the actual state of the brake cylinder pressure in the above case of abnormal power loss of the EBCU, resulting in traction blockage, the present invention provides a brake release control circuit for a subway vehicle brake system and control method, so that the EBCU can output the correct brake release signal in the case of normal operation and abnormal power failure, so as to avoid the occurrence of rescue accidents caused by abnormal traction blockade

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