关键词: 整车质心；测量精度；悬架变形；姿态锁止

Abstract: There are one or more of the following problems in the vehicle centroid measurement methods (lifting method and pendulum method): during the measurement, the front and rear suspension compression, tire deformation and friction change, etc. They cause the problem that the measurement deviation of centroid in X, Y and Z directions is too large. These deviations will be multiplied and redundant in the design and verification of each module, which will affect project schedule, cost and development cycle. This paper mainly studies how to solve the above problems. By studying the measurement process of current measurement methods, combined with the analysis of the physical structure of the real vehicle, and then comparing the theoretical digital analog data with the real vehicle measurement structure, we summarize the causes of the above problems. We solve the deformation problem of spring and tire in the measurement process by establishing a rigid connection mechanism. A special mechanism is designed to convert the sliding friction of the tire into the rolling friction of the bearing, so as to reduce the problem that the direction of internal friction and reaction force cannot be determined. Through the calibration of the position sensor and inclination measuring instrument on the equipment, the deviation of lifting height and inclination angle in the measurement can be reduced. Through the above measures and methods, the measurement accuracy can be improved.

Key words: Vehicle centroid; Measurement accuracy; Suspension deformation; Attitude lock