Abstract: In order to improve ride comfort and handling stability, ECAS / ESAC system is introduced, in which decision-making control of the air suspension system is used as a control strategy, and then based on the partial frequency of suspension and stiffness properties of air spring, adjustment range of the height of air spring is reversely deduced. Meanwhile, the height of air spring is determined according to the speed. In addition, the match between spring stiffness and shock absorber damping is realized through the optimization of genetic algorithm. On the basis of the results of the match, the damping control mode and control strategy are finally determined. The dynamic mode of semi-car in the non-linear system and serpentine test are respectively used to simulate the ride comfort and handling stability under ECAS / ESAC system. The simulation results and the test demonstrate that: owing to the implementation of control strategies, ride comfort and handling stability of air suspension system are both improved under random road condition.

Key words: Air spring, Control strategy, Genetic algorithm, Ride comfort, Stability