Electric control apparatus for damper device in suspension syste

Details Electric control apparatus for damper device in suspension syste Electric control apparatus for damper device in suspension syste

1997-08-28

1999-03-23

English, Peter C.

Land vehicles

Suspension modification enacted during travel

Suspension stiffness for ride comfort

1882661, 701 37, B60G 1708, B60G 17015

Patent

active

058849211

ABSTRACT:
An electric control apparatus for a damper device in a suspension system of an automotive vehicle, wherein absolute velocity of a sprung mass of the vehicle and relative velocity of the sprung mass to an unsprung mass of the vehicle in vertical movement are detected to determine a target damping coefficient in a predetermined small value when the detected absolute velocity is different from the detected relative velocity in a movement direction and to increase the target damping coefficient in accordance with an increase of a ratio of the detected absolute velocity to the detected relative velocity when the detected absolute velocity coincides with the detected relative velocity in the movement direction, and wherein a magnitude of vertical vibration of the sprung mass is detected to correct the target damping coefficient to a predetermined small value when the detected magnitude of vertical vibration of the sprung mass is less than a predetermined value and to increase the maximum value of the target damping coefficient in accordance with an increase of the detected magnitude of vertical vibration of the sprung mass more than the predetermined value.

REFERENCES:
patent: 5322320 (1994-06-01), Sahashi et al.
patent: 5324069 (1994-06-01), Ogawa
patent: 5430646 (1995-07-01), Kimura et al.
patent: 5697634 (1997-12-01), Kamimae et al.
patent: 5701245 (1997-12-01), Ogawa et al.

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