关键词: 铁路运输, 长大下坡速度控制, 空电联合制动, 重载机车, 自动驾驶系统, 西康铁路

Abstract: The railway transport amount has been promoting with the use of heavy haul freight train, which also brings safety risks. As time went on, such potential safety matters have received wide-spread attention. It is known that the long heavy downgrade railways are the most dangerous part for heavy haul freight train, especially on the continuous long heavy downgrade section. It was found that the key to resolve this problem is to control the speed of the train. This paper focuses on speed control and proposes an electro-pneumatic braker application method, which is based on air brake and with power brake supplement. The paper proposes the method and applies it into the automatic train operation system, which have been used on heavy haul freight HXD2 locomotive. Through the practical tests in QinLing region along the XiKang railway, the running tests performed are more than 40000 kilometers in one year, while the train draw average qualities no less than 3900- ton. Eventually, the method obtains the expected results and the proposed method could give certain guidelines for user. What is more important, this method can effectively ensure the safety and steady for locomotive during automatic driving, especially when the train running in the long heavy downgrade section.

Key words: railway transportation, speed control at long downgrade segment, electro-pneumatic brake, heavy haul locomotive, automatic driving system, XiKang railway