Optimization of hydrodynamic and hydrostatic steering control system based on GA-PID

As the tracked vehicles often run in harsh environments, a certain type of tracked vehicles with hydrodynamic and hydrostatic steering mechanism often have a big pressure fluctuation in the hydrostatic system in the steering process and the steering properties are seriously affected. In order to smoothly match the hydrodynamic and hydrostatic steering mechanism, we implemented the electro-hydraulic proportional valves instead of the oil-filling valves that equipped in the real vehicle and modeled the steering system in the Matlab/Simulink platform in this paper. A PID controller that optimized by the Generic Algorithm (GA) can control the oil flow into the hydraulic equipped according to the fluctuation of pressure was designed. The simulation results showed that the optimized system inhibit the pressure fluctuation well, with a rapid dynamic response and good steering performance.