DAMPING FORCE CONTROLLER

摘要

When the product of the sprung rate sum xb' and the relative sprung - unsprung rate xs' is positive, the control mode of the damping force characteristic undergoes variable control. Thus, when vibrations in the intermediate/high frequency band do not enter a suspension device (SP), based on the nonlinear H8 control theory, the operation of a variable aperture mechanism (30) is controlled so that the number of steps to represent the damping force characteristic of a damper (20) changes in response to the vibrating state of a sprung member (HA). In addition, when the product of the sprung rate sum xb' and the relative sprung - unsprung rate xs' is negative, the control mode of the damping force characteristic undergoes operation-prohibited control. Thus, when the vibrations in the intermediate/high frequency band enter the suspension device (SP), the operation of the variable aperture mechanism (30) is prohibited, and increases in the operating speed and increases in the amount of work of the variable aperture mechanism (30) are suppressed. Thus, the durability of the variable aperture mechanism (30) is improved.