An Advanced Anti-Slip Control Algorithm for Locomotives Under Complex Friction Conditions

The locomotive wheelsets configured with high-power AC traction motors are very prone to slip under poor friction conditions, which usually impair traction/braking efficiency. To avoid the adverse consequence caused by the conspicuous slipping behaviors of wheels, the anti-slip control modules are consequently equipped on high-power locomotives. This paper presents an advanced anti-slip control algorithm for heavy-haul locomotives travelling with complex wheel/rail friction conditions. The proposed anti-slip control model is implemented in a three-dimensional (3D) heavy-haul train-track coupled dynamics model, in which the real-time estimation of wheel/rail adhesion conditions and relevant optimization adjustment of control threshold values are considered. The wheel/rail dynamic interactions of the heavy-haul locomotive under traction/braking conditions and multifarious friction conditions are investigated. The control effects of the anti-slip controllers with changeable and constant threshold values are compared. It is shown that the traction/braking loads and friction conditions have a significant effect on wheel/rail interactions. The optimal traction/braking efficiency can be realized by adopting the anti-slip controller with alterable threshold values.

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