Problems of using active-recuperative suspension and ways to solve them

The aim of the work is to reveal the unobvious disadvantages of active-recuperative suspension, as well as to identify possible options for dealing with them. Such problems are the danger of suspension breakdown in the active mode, the impossibility of operating in the regenerative mode when the suspension deformation rate is below the threshold, and the system operation in swing mode. The novelty of the work lies in the fact that these aspects of the functioning of the active-recuperative suspension system were not previously considered. The problem of the increased risk of suspension breakdown is that in the active mode, the deformation of the elastic device occurs not only due to the work of external disturbance (road irregularities), but also due to the work performed by the actuator. The following solutions are offered: correct selection of system parameters; collection of additional information about the roughness profile; introduction of preventive measures into the control algorithm. The problem of the impossibility of operating in a regenerative mode at a suspension deformation rate below the threshold is that the electromotive force of induction on the rotor winding at low speeds may be lower than the threshold charging voltage at the terminals of the energy storage device. The following solutions are offered: dry friction in the suspension; introduction of a shock absorber with a pronounced degressive characteristic into the suspension structure; lowering the charging threshold voltage by separating the supply and charging circuits using a voltage converter; introduction of a “scattering chain” into the armature chain; optimal control of the excitation circuit. The problem of the system operation in the swing mode is that, under certain conditions, energy is supplied to the oscillatory system through the actuator, resulting in a gradual increase in the oscillation amplitude. The following solutions are proposed: the introduction of an additional damper or regenerative connection on the deformation rate of the suspension.

vehicle, active suspension, recuperative suspension, electromagnetic damper