Downhill air brake adjusting method and system for train

Abstract

The invention provides a train downhill air brake adjusting method and system. The method comprises the steps that a reference speed curve is determined; an air braking speed threshold value is determined; and according to comparison of the sum of the current train speed and the air braking speed threshold value of the train and the reference speed, applying or cancelling of air braking of the train is adjusted. The cruise lower bound is adjusted according to the air charging time, the air discharging time and the downhill gradient value to ensure the smoothness of level output, application and revocation of air braking can be evaluated more accurately, the smoothness of air braking output is ensured, and meanwhile, the stability of the level output is improved. And the formed electric braking and air braking switching strategy has good effects on reducing longitudinal impulse in the train running process and improving the train running stability, and it is guaranteed that the train safely and efficiently passes through lines with complex road conditions.

Description

technical field [0001] The invention belongs to the field of train control, and in particular relates to a downhill air brake adjustment method and system for a train. Background technique [0002] When a heavy-duty locomotive is running downhill, it will perform the unique cyclic braking of the locomotive on a long downhill slope. The air brake of the locomotive includes two stages of braking and relief, and the relief should be satisfied between two adjacent air brakes. Refilling the air restraint can ensure the braking effect of the second air brake. During cyclic braking, the compressed air consumed by each air brake must be supplemented before the next brake, that is, "refill air". If the refill air is insufficient, the braking force of the next air brake will be affected. As the braking continues, the temperature of the locomotive brake shoes is also rising, which will not only increase the loss of the locomotive brake shoes, but also affect the subsequent braking. Th...

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Problems solved by technology

[0003] However, in the prior art, it is not easy to directly evaluate the process from the application of the air brake until the locomotive can decelerate. Too long or too short filling time leads to poor air braking effect

In the prior art, the air brake is not timely or the air filling time is insufficient, and the following problems have occurred: if the air brake is triggered when the train running speed will exceed the speed limit of the line, due to the delay of the braking effect, the train will There is a danger of overspeeding; if the air brake is performed at a low train speed, the operating efficiency of the train will not be high. On the other hand, the auxiliary air cylinder may be insufficiently inflated due to the short relief time, which will affect the braking.

When relief is required, if the train speed is too high to relieve, it may lead to insufficient air pressure in the auxiliary air cylinder during the next braking, and there is not enough braking force; if the train speed is too low to relieve, the train may stop

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