System and method for controlling damping force characteristic o

Details System and method for controlling damping force characteristic o System and method for controlling damping force characteristic o

1991-11-14

1994-02-22

Chin, Gary

Boots, shoes, and leggings

280707, 280840, B60G 1700

Patent

active

052893804

ABSTRACT:
A system and method for controlling a damping force for a vehicular damper is disclosed in which the damper is provided with a damping factor adjusting mechanism which is installed for adjusting the damping force characteristic at a plurality of stages. When both directions of a vertical velocity of an sprung mass (vehicle body) and of a relative velocity between the unsprung mass and sprung mass coincide with each other, a controller outputs a control signal to the damping factor adjusting mechanism so that the damping force characteristic of the damper is changed to a higher damping force side, provided that the relative velocity exceeds a predetermined dead zone. In addition, when both directions do not coincide with each other, the controller outputs the control signal so that the damping force characteristic is changed to a lower damping force side. The controller determines a stroke direction of the damper on the basis of the relative velocity and shifts the predetermined dead zone toward a direction opposite to the determined stroke direction. Since the dead zone is shifted, the timing with which the relative velocity exceeds the dead zone is speeded up so that the change timing of the damping factor from the lower damping force side to the higher damping side occurs earlier.

REFERENCES:
patent: 3807678 (1974-04-01), Karnopp et al.
patent: 4961483 (1990-10-01), Yamaoka et al.
patent: 5033770 (1991-07-01), Kamimura et al.
patent: 5103396 (1992-04-01), Hiwatashi et al.
patent: 5144559 (1992-09-01), Kamimura et al.

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