关键词: 油气悬架；车高调节；轮荷

Abstract: To solve the problem of significant differences in coaxial left and right wheel loads and poor data repeatability in measuring wheel loads after multiple automatic center adjustments for a certain hydro-pneumatic suspension vehicle model, through experimental measurements of wheel load and suspension cylinder pressure, it is found that there is a positive correlation between wheel load and cylinder pressure. Using a simplified mathematical model, it is analyzed that the reason for this phenomenon is that using only the length of the hydro-pneumatic spring to adjust the vehicle height strategy will lead to uncertainty in the gas pressure and oil volume inside the hydro-pneumatic spring, thereby causing differences and uncertainties in wheel load. Therefore, this article proposes that the height adjustment control strategy for hydro-pneumatic suspension vehicles needs to introduce pressure (or oil volume in the hydro-pneumatic spring cylinder) control to avoid the negative impact of significant differences in left and right wheel loads on safety and stability.

Key words: Hydro pneumatic suspension; Car height adjustment; Wheel load