Anti-Rollover Warning Control of Dump Truck Lifting Operation Based on Active Suspension

The flexible parts of the dump truck such as the suspension, tires and cargo box can affect the roll stability of the vehicle during the lifting process. In order to improve the adverse effects of these flexible parts on the roll stability of the dump truck during lifting, and to prevent the vehicle from rolling over, this paper proposes an anti-rollover warning control method based on active suspension. The nonlinear model of the lift and roll of the dump truck is established by considering the influence of elastic deformation of the tire, suspension, and torsional deformation of the cargo box on the roll of the vehicle, and dynamic characteristics of the nonlinear model are verified in the MATLAB/Simulink simulation environment. A fuzzy-PID controller is designed to make decisions on the active suspension control force as well as the ratio of the vertical load of the non-bearing wheel to the total weight of the vehicle is used as the rollover evaluation index to realize the rollover warning. Furthermore, the improvement effect of the control system is analyzed from the aspects of rollover evaluation index, roll angle and critical lifting angle. Finally, the simulation results show that the proposed method effectively improves the roll stability of the dump truck during the lifting operation and can widen the threshold range of the critical lift angle to a certain extent and prevent the vehicle from rolling over.