Abstract:

A mathematical model was built for an automotive magneto-rheological damper based on the performance test. A multi-body dynamics model and a vistual proving ground were established for a passenger car using the multi-body dynamics simulation software SIMPACK. In view of the impact of the semi-active suspension system(SASS) and the steering system on the vehicle steering stability, a coordinated controller based on the PID neural network was designed, the data exchange interface between the SASS coordinated controller and the vehicle multi-body dynamics model was defined under MATLAB enviornment, and the coordinated control of vehicle SASS and steering system was achieved. The simulation results showed that the corrdinated control stralegy using PID neural network can reduce the vibration transmitted from the suspension system, adjecst the yaw and roll motions of car body at steering condition, mitigate the contradiction between steering stability and ride comfort of the vehicle.

Key words: vehicle engineering, semi-active suspension, steering stability, coordinated control, simulation