Brake control method and system for an electric locomotive

Abstract

The invention discloses an electric locomotive braking control method. The method includes the steps of receiving a manually-given instruction and the locomotive speed v fed back by a sensor, determining that a locomotive is in the braked state, and starting the braking control logic, wherein the instruction includes the motorman controller level N and the state amount; obtaining the characteristic current I1 and the limiting current I2 according to the motorman controller level N, the locomotive speed v and the characteristic relational expression and the limiting relational expression of the current-limiting and quasi-constant braking force, and selecting the minimum value in the characteristic current I1 and the limiting current I2 to serve as the target braking current IZ; using the target braking current IZ as the input of an electric locomotive braking closed-loop control system, and controlling the braking current Im to follow the current of the target braking current IZ. The invention further discloses an electric locomotive braking control system. By means of the method and the system, under the periodic locomotive speed sudden change working condition of the electric locomotive, the braking electricity generation voltage and the braking current changes are smoother, the influences of electric impact on an electric motor are effectively eliminated, and meanwhile the reversing performance is optimized and the reverser working environment is improved.

Description

technical field

[0001] The invention relates to the technical field of locomotive braking control, in particular to a braking control method and system for an electric locomotive. Background technique

[0002] The SS4B type electric locomotive is an 8-axle heavy-duty freight AC-DC electric locomotive developed at the end of the 20th century. It is composed of two identical 4-axle electric locomotives through internal reconnection. The pulse-current motor realizes constant current, quasi-constant speed traction control and traditional current limiting, quasi-constant speed plus feed resistance braking control through micro-cabinet phase control and voltage regulation.

[0003] When the SS4B electric locomotive is going downhill on a long slope, its electric braking force cannot meet the braking requirements of heavy-duty trains, and the crew needs to frequently use the air brake to reduce the speed. For example, when a SS4B electric locomotive pulls a 5000t class heavy-duty ...

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