Design of a current driver controller for MR CDC dampers

In this paper, a new current control algorithm has been proposed in order to control the current provided into a coil which produces a magnetic field in the MR (magneto-rheological) damper. The MR (magneto-rheological) damper is able to control a damping coefficient of the fluid through an orifice by using the MR fluid which has a characteristic of viscosity variation according to inducted current. In general, The MR CDC (continuous damping control) damper has faster response time than other ones. However, the MR damper has disadvantage of time delay according to input command due to very large inductance of internal coil. A new robust lead compensation control algorithm has been to overcome the above disadvantage of the MR damper. The proposed control algorithm is also able to provide more robust current control performance even under variation of the coil resistance induced from temperature variation.