Active suspension system
First Claim
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1. An active suspension system for motor vehicles, comprising:
- a suspension unit arranged between a sprung mass and an unsprung mass, said suspension unit having a passive, uncontrolled spring element and, arranged in series with said spring element, a hydraulic displacer unit having a controllable stroke adjustment;
displacement sensors associated with the suspension unit, said displacement sensors generating both a first signal representing a respective stroke position (x) of the unsprung mass relative to the sprung mass, and a second signal representing a respective stroke position (y) of the displacer unit;
a further sensor generating a third signal representing a vertical acceleration of the sprung mass;
a regulation system generating a fourth signal, (x-y)actual, representing a difference between the first and second signals, said difference representing a suspension force of the uncontrolled spring element, and controlling the stroke adjustment of the displacer unit in accordance with a comparison of said fourth signal with a required value, (x-y)required, and the third signal for only dampening vertical motions of the sprung mass.
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Abstract
An active suspension system, in particular for motor vehicles, is provided whose suspension or support units arranged between the sprung and the unsprung mass have, in each case, a passive, uncontrolled spring element and, arranged in series with the latter, a hydraulic displacer unit with controllable adjustment. The arrangement of displacement pick-ups, which reproduce the stroke position of the sprung mass relative to the unsprung mass and the stroke of the displacer unit, allows for carrying out a regulation of the current supporting forces by a required/actual value comparison which uses only the displacement measurements.
23 Citations
9 Claims
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1. An active suspension system for motor vehicles, comprising:
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a suspension unit arranged between a sprung mass and an unsprung mass, said suspension unit having a passive, uncontrolled spring element and, arranged in series with said spring element, a hydraulic displacer unit having a controllable stroke adjustment; displacement sensors associated with the suspension unit, said displacement sensors generating both a first signal representing a respective stroke position (x) of the unsprung mass relative to the sprung mass, and a second signal representing a respective stroke position (y) of the displacer unit; a further sensor generating a third signal representing a vertical acceleration of the sprung mass; a regulation system generating a fourth signal, (x-y)actual, representing a difference between the first and second signals, said difference representing a suspension force of the uncontrolled spring element, and controlling the stroke adjustment of the displacer unit in accordance with a comparison of said fourth signal with a required value, (x-y)required, and the third signal for only dampening vertical motions of the sprung mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification