The identification of operational cycles in the monitoring systems of underground vehicles

Abstract

The identification for the operational cycles of underground haul trucks is considered in the paper. In previous works related to LHD (Load Haul Dump) vehicles and haul trucks, a hydraulic pressure signal was used. In this paper, it is shown how to determine operational cycles when the pressure sensor in the unloading mechanism is either not available or damaged. The virtual sensor for the identification of operational cycles is based on logical conditions that include standard signals from the electronic control units (ECU) of underground haul trucks. These signals are braking pressure, gear selection, vehicle speed and engine rotations. The robustness of the algorithm is checked on three test data sets with 97 events of truck unloading. The reliability of event detection is about 90%, and false events recognition probability is 5%. The algorithm is efficient enough and its implementation on-line, as well for post-processing of historical data is possible.