关键词: 电控空气悬架；空气弹簧可变刚度；分层架构控制；悬架动态特性

Abstract: In order to improve the driving stability of commercial vehicles and the integrity of goods carried, a MATLAB/Simulink air spring variable stiffness suspension model is established by applying fluid mechanics and Newtonian mechanics. According to the actual working conditions of the vehicle, a layered architecture control strategy with dead zone of body height adjustment is designed, and proportion integration differentiation (PID) algorithm is used to control the duty cycle of pulse width modulation (PWM) signal to change the opening and closing state of the solenoid valve. Finally, the dynamic characteristics of the front and rear suspension are compared and analyzed. The simulation results show that the dynamic deflection and the root mean square value of the sprung mass acceleration of the suspension with PID control strategy have been improved to varying degrees under the conditions of class B random road with vehicle speeds of 50 km/h and 90 km/h respectively, which effectively improves the dynamic performance of the electronically controlled air suspension.

Key words: Electronically controlled air suspension; Variable stiffness of air spring; Hierarchical architecture control; Suspension dynamic characteristics