Suspension system for a vehicle
First Claim
1. A suspension system for a vehicle comprising:
- a shock absorber provided between a sprung member and an unsprung member for changing a damping force characteristic into four or more characteristics;
oscillation frequency range detecting means for detecting an oscillation frequency range of the sprung member of the vehicle;
road detecting means for detecting a road surface;
damping force characteristic limiting means for limiting the damping force characteristics to less than four characteristics, and for receiving signals from the oscillation frequency range detecting means and the road detecting means so as to limit the damping force characteristics of the shock absorber to a higher level side of the less than four damping characteristics when the sprung member is in a low frequency oscillation range, to a lower level side of the less than four damping characteristics when the sprung member is in a high frequency oscillation range, and to a medium level side of the less than four damping characteristics when the road surface is uneven; and
damping force characteristics changing and controlling means for changing and controlling the damping force characteristic of the shock absorber on the basis of a given control rule to a characteristic within the damping force characteristics limited by the damping force characteristic limiting means.
1 Assignment
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Accused Products
Abstract
In a suspension system for a vehicle comprising a shock absorber of which damping force characteristics can be changed into four or more characteristics, detecting means detect the oscillation frequency range of the sprung member of the vehicle and a bumpy road. From the four or more damping force characteristics of the shock absorber, the number of characteristics on the higher level side are limited to two or so when the sprung member is in a low frequency oscillation range, that of the characteristics on the lower level side are limited to two or so when the sprung member is in a high frequency oscillation range, and that of the characteristics on the medium level side are limited to two or so when a road is bumpy. The damping force characteristic of the shock absorber is selected and changed on the basis of a given control rule only within the limited damping force characteristics. Thus, it is possible to prevent noise and oscillation from being caused by the large change of the damping force characteristic. Furthermore, there can be obtained comfortableness to ride in and stability on a high level.
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Citations
9 Claims
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1. A suspension system for a vehicle comprising:
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a shock absorber provided between a sprung member and an unsprung member for changing a damping force characteristic into four or more characteristics; oscillation frequency range detecting means for detecting an oscillation frequency range of the sprung member of the vehicle; road detecting means for detecting a road surface; damping force characteristic limiting means for limiting the damping force characteristics to less than four characteristics, and for receiving signals from the oscillation frequency range detecting means and the road detecting means so as to limit the damping force characteristics of the shock absorber to a higher level side of the less than four damping characteristics when the sprung member is in a low frequency oscillation range, to a lower level side of the less than four damping characteristics when the sprung member is in a high frequency oscillation range, and to a medium level side of the less than four damping characteristics when the road surface is uneven; and damping force characteristics changing and controlling means for changing and controlling the damping force characteristic of the shock absorber on the basis of a given control rule to a characteristic within the damping force characteristics limited by the damping force characteristic limiting means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification