The paper presents theoretical analysis of excited vibrations of the vehicle in a wide range of excitation frequencies (from I to 80 Hz). The mathematical model and calculations were prepared for the accepted physical model of the vehicle. The model was used to simulate the excited vertical vibrations. The bifurcation figures with an excitation frequency as a bifurcation parameter were determined on the basis of the simulation results - the changes of kinematics values in time. Bifurcation diagrams give a picture of vehicle vibrations. This picture gives the possibility of identification of characteristic parameters of sprigs and dumping elements and can be used for control, diagnostic aims, and for making technical investigations of vehicle suspension.