A wheel slip detection method of electric locomotive based on time-frequency analysis

Rapid and effective identification of wheel slip plays an important significance to improve traction force of electric locomotive. A novel detection method of wheel slip was studied in this paper. Firstly, the Hilbert energy spectrum of wheel speed was calculated with the Hilbert-Huang Transform method. The tendency of wheel slip was obtained with the energy spectrum change. Then the acceleration was calculated after filtering the wheel speed data. The wheel slip was detected using the tendency of wheel slip and acceleration combined with the analysis of time domain and frequency domain. Finally, a water spring wheel-slip test was conducted with a HXD2C-type electric locomotive to verify the effectiveness of the detection method.