Active vibration control for reduction of interior noise caused by R-MDPS

This paper presents an active vibration control (AVC) to reduce the vibration of motor driven power steering (MDPS). The MDPS used in the experiment was R-MDPS, an MDPS connected to Rack Gear. When the R-MDPS generates vibration in the operating state, the vibration is transmitted through the subframe. The vibration transmitted through the subframe generates indoor noise and reduces the driving quality of the driver. To reduce vibration, the AVC was used by inserting an actuator between R-MDPS and subframe. The actuator used Piezo material is called a Piezo actuator. To select the location of the actuator, Transfer path analysis (TPA) was performed. the effect was confirmed by setting the main path to error point. The experiment was conducted for feasibility by connecting R-MDPS and subframe to a test bench manufactured in the laboratory. The algorithm used for vibration control used the Filtered-X Least Mean Square (FxLMS) algorithm and the control result was reduced from 4 to 5 dB. It is shown that proposed method is an effective vibration reduction effect of R-MDPS.