Suspension control method and suspension control system

Abstract

The present invention solves rattling and a feeling of hardness of an unsprung member at low stroke speeds that occurs with a known skyhook control. The present invention is provided with a control device that applies, to a variable damping force damper of a suspension mechanism, a target control force determined on the basis of a damping coefficient of the variable damping force damper. The control device is provided with a state estimation unit that calculates a sprung speed of a sprung member on the basis of a value detected by some of a plurality of sensors; an application control unit that calculates a damping coefficient of the variable damping force damper on the basis of the sprung speed and outputs the damping coefficient; and a target control amount management unit that determines the target control force on the basis of the damping coefficient output by the application control unit. Also, the control device determines a target control force on the basis of a pre-stored damping coefficient in a case of a first condition.

Description

technical field [0001] The invention relates to a suspension control method and a suspension control system. Background technique [0002] As a technique for controlling vehicle vibration, there is known skyhook control realized by a variable damping force damper provided in a suspension mechanism. Skyhook control is a technique for controlling the damping force of a variable damping force shock absorber based on the relative speed of the sprung speed and stroke speed (damper speed) of the suspension mechanism. [0003] In the conventional skyhook control, while the vehicle body (sprung) is moving with a small change in sprung speed, when a large change in the vicinity of the unsprung resonance frequency is applied to the wheel (unsprung) from the road surface, etc. During vibration (movement), the convergence of the vehicle body in attitude control is reduced, and the sprung vibration cannot be converged, thereby affecting ride comfort. Therefore, for example, a technique ...

AI Technical Summary

Problems solved by technology

[0003] In the conventional skyhook control, while the vehicle body (sprung) is moving with a small change in sprung speed, when a large change in the vicinity of the unsprung resonance frequency is applied to the wheel (unsprung) from the road surface, etc. During vibration (movement), the convergence of the vehicle body in attitude control is reduced, and the vibration on the sprung cannot be converged, thereby affecting ride comfort. Therefore, for example, the technology disclosed in the following Patent Document 1 has been proposed.

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