Height Adjustable Hydraulically Interconnect Suspension Modeling And Whole Vehicle Performance Analysis

Off-road vehicles need high ground clearance i n order to satisfy its traffic ability, but this will increase its centroid height, and lead to roll easily when turning around at high speed. Traditional suspension system uses anti-roll bars to improve the vehicle’s roll resistance, but anti-roll bars limit the off-road performance. This research was funded by the National Natural Science Foundation of China, “Anti-Rollover Control Study of Active Interconnected Suspension of Vehicle ”(No. 51175157). A new type of hydraulically interconnected suspension is proposed. It will contribute to improving the rollover resistance without affecting other performance, especially in the vehicle’s off-road performance. Based on research of the national natural science foundation project, we propose a height adjustable semi-active hydraulically interconnected suspension, which can provide larger roll stiffness as well as adjusting the body height and comfort improvement. The main content of this paper includes the following several aspects:(1) Studied a new type of hydraulically interconnected suspension system, and clarified the basic structure and basic principle of the hydraulically interconnected suspension. Built the Simulink model and AMESim model of the hydraulically interconnected suspension, and analyzed its performance characteristic Analysis results show that hydraulically interconnected suspension can provide larger roll torque in the roll state.(2) Based on Car Sim/Simulink/AMESim co-simulation platform, a vehicle multi-body dynamics model coupled fluid system with hydraulically interconnected suspension systems is established and the relevant handling stability and ride experimental simulation studies are made. In order to verify the accuracy of the co-simulation platform, a hydraulically interconnected suspension is designed for a certain military vehicle, and a series of road tests are carried out. The experimental results are good agreement with the simulation results. It illustrate that the co-simulation model is correct, and provide a new computer simulation method for follow-up design and optimization in this kind of suspension system. Experiment and simulation results show that hydraulically interconnected suspension can offer larger roll stiffness, enhance the safety of vehicle when cornering at high speeds,and improve the handling stability of vehicles without affecting the ride comfort.(3) Designed a height adjustable semi-active hydraulically suspension system, which can adjust the body height according to the driving conditions and improve the vehicles’ performance. Simulation analysis of the semi-active hydraulically interconnected suspension system are carried out on the co-simulation platform. Simulation results of typical operating tests indicate that the semi-active hydraulically interconnected suspension system can realize the adjustment of the body height, and it can largely improve the vehicles’ handling stability and driving comfortability. It provides a new strategy for the vehicles’ body height control.In summary, This paper put forward a new method for constructing the hydraulically interconnected suspension model and the new height adjustable hydraulically interconnected suspension system, which has good value for academic research as well as engineering application.