| To meet the requirements of comfort, stability and safety of the ground carrier, enterprises and research institutes have been working to improve vehicle comfort, ride and safety. Vehicle roll motion and rollover have significant impact on vehicle performance. Therefore, Active anti-roll bar which can improve vehicle ride and safety by providing anti-roll moment, without reducing ride comfort has been a research hotspot.According to the running state and body posture of vehicle, active anti-roll bar can adjust roll angle to improving vehicle ride and safety. Now, some active anti-roll bars are equipped in a few of foreign vehicles, but their actuators are structure complexed, volume large, and large space required. Therefore, a new type of active anti-roll bar structure will be presented, which is structure compact, easy to decorate, and good general. Mechanical structure and electric control system is designed and manufactured, and control strategy and effectiveness will be studied by simulation. The main contents and conclusions are as follows:1. Ideal curve of roll angle getting. Mechanical analysis of simplified rigid and flexible suspension model will be presented, and the lateral acceleration corresponding to rollover threshold of both models will be got. Considered the curves of lateral acceleration with different roll rates in passive suspension and the rollover risk perception from occupants, the ideal roll angle curve to lateral acceleration will be obtained.2. The desired effect active anti-roll bar system on vehicle. The work principle of a new dual channel electronic active anti-roll bar will be proposed. Though the vehicle dynamics analysis, a 3-DOF model will be established and verified. Under the linear quadratic optimal method, the ideal effectiveness will be got by simulation.3. The effectiveness of actual active anti-roll bar system. According to the analysis of the finite element models of anti-roll bars and the mathematical expressions of the external characteristics of other components, the active anti-roll bar system model will be built. Base on the 3-DOF model, the full effect will be obtained by adjusting control matrix.4. Research on control strategy of active anti-roll bar system. Vehicle model will be built and verified by TruckSim. Close loop control and open loop control are analyzed by using the co-simulation of TruckSim and Simulink. By comparing, the open loop control is feasible in actual conditions. |
