Abstract:

In this paper， an analytical method for the steering kingpin parameters and the offsets of its intersection point with ground surface is proposed， which is suitable for both the suspension with physical kingpin and that with virtual one. First of all， the wheel alignment vectors before and after a micro?rotation are analyzed. Then according to the transforming matrix of spatial rotation and through error correction iteration， the kingpin alignment parameters meeting the requirement of error threshold are solved out. Finally， two vehicles with different types of suspension are analyzed for verification. The well agreement between the real vehicle data and analytical results demonstrates the correctness of the derived analytical method for the steering kingpin parameters and its offsets. Besides， the analytical method can also continuously express the kingpin parameters at different steering angles.

Key words: kingpin, wheel rotation, ground intersection offset, suspension K&C, analytical me?thod