Suspension device comprising a spring corrector
First Claim
1. A suspension device which controls the range of movement between a suspended point and a non-suspended point, comprising an elastic link mounted between said suspended and non-suspended points, said elastic link including a spring and a reversible electric jack acting parallel to the spring in order to control the movements between said suspended and non-suspended points, and means for controlling the electric jack so that, based on a variation in the distance between said suspended and non-suspended points caused by relative displacement of the suspended and non-suspended points, regardless of the direction of displacement, the electric jack first follows the direction of the deformation of the spring caused by a change in the contour of the road, while supplying the electric jack with electrical energy so that it develops a force oriented in the same direction as the direction of the deformation of the spring caused by said change in the contour of the road, and then the means for controlling the electric jack reduces said force developed by the electric jack so as to cancel out said force due to said variation in the distance within a predetermined relaxation time.
1 Assignment
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Accused Products
Abstract
The suspension device controls the range of movement between a suspended point connected to the body 3 of a vehicle and a non-suspended point connected to a wheel 2 which includes an elastic link 1 mounted between said suspended and non-suspended points, the elastic link being essentially composed of a spring of stiffness K and predetermined length under a reference load and a reversible electric jack 5 acting parallel to the spring 4 in order to control the movements between said suspended and non-suspended points. The device controls the electric jack so that, based on a variation observed in the distance between the suspended and non-suspended points caused by relative displacement of the suspended and non-suspended points, regardless of the direction of displacement, it first follows the spring while supplying the electric jack 5 with electrical energy so that it develops a force oriented in the same direction as the displacement, and then releases the force developed by the electric jack 5 so as to cancel out the force within a predetermined relaxation time.
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Citations
20 Claims
- 1. A suspension device which controls the range of movement between a suspended point and a non-suspended point, comprising an elastic link mounted between said suspended and non-suspended points, said elastic link including a spring and a reversible electric jack acting parallel to the spring in order to control the movements between said suspended and non-suspended points, and means for controlling the electric jack so that, based on a variation in the distance between said suspended and non-suspended points caused by relative displacement of the suspended and non-suspended points, regardless of the direction of displacement, the electric jack first follows the direction of the deformation of the spring caused by a change in the contour of the road, while supplying the electric jack with electrical energy so that it develops a force oriented in the same direction as the direction of the deformation of the spring caused by said change in the contour of the road, and then the means for controlling the electric jack reduces said force developed by the electric jack so as to cancel out said force due to said variation in the distance within a predetermined relaxation time.
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12. A suspension device which controls the range of movement between a suspended point and a non-suspended point, comprising an elastic link mounted between said suspended and non-suspended points, said elastic link including a spring and a reversible electric jack acting parallel to the spring, said elastic link having a base distance between the suspended point and the non-suspended point for which the spring develops a spring static load force corresponding to a static load acting on said suspension device, said electric jack controlling the movements between said suspended and non-suspended points, said suspension device having means for controlling the electric jack, said means continuously recalculating a current to be supplied to said electric jack according to a predetermined sampling period so that, based on a variation observed in the distance between said suspended and non-suspended points with respect to said base distance, regardless of the direction of said variation, the electric jack develops a correcting force oriented in the same direction as said variation, the magnitude of said correcting force:
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being a finction of said variation observed in the distance between said suspended and non-suspended points with respect to said base distance; and being reduced in order to be cancelled out within a predetermined relaxation time occurring within a number of sampling steps. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification