Patent US5743553A successfully refreshed from Google Patents.
US5743553A
Expired / Lapsed
US
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Active suspension system
Assignee: Mercedes Benz Group AG
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Filing: 1995-04-24
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Granted: 1998-04-28
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Expires: 2015-04-24
Abstract
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.
Inventors
- 👤 Guenter Nagel
- 👤 Martin Winkler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:13
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/018; B60G17/02; B60G17/027; B60G17/0272; B60G2202/00; B60G2202/10; B60G2202/12; B60G2202/40; B60G2202/41; B60G2202/413; B60G2204/00; B60G2204/10; B60G2204/12; B60G2204/124; B60G2400/00; B60G2400/25; B60G2400/252; B60G2400/50; B60G2400/51; B60G2400/512; B60G2400/60; B60G2500/00; B60G2500/10; B60G2500/20; B60G2500/22; B60G2500/30; B60G2600/00; B60G2600/18; B60G2600/182; B60G2600/22; B60G2600/26; B60G2600/70
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
173 words
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.
Claim 2
Dependent Claim
173 words
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.
Claim 3
Dependent Claim
33 words
A system according to claim 1, further comprising: a controllable shockabsorber arranged in parallel with the uncontrolled spring element, said shockabsorber dampening resonance motions of the unsprung mass relative to the sprung mass.
Claim 4
Dependent Claim
27 words
A system according to claim 2, wherein the shockabsorber is arranged in parallel with the series arrangement of the uncontrolled spring element and the hydraulic displacer unit.
Claim 5
Dependent Claim
22 words
A system according to claim 1, wherein the sprung mass is a vehicle superstructure and the unsprung mass is a vehicle wheel.
Claim 6
Dependent Claim
22 words
A system according to claim 2, wherein the sprung mass is a vehicle superstructure and the unsprung mass is a vehicle wheel.
Claim 7
Dependent Claim
22 words
A system according to claim 3, wherein the sprung mass is a vehicle superstructure and the unsprung mass is a vehicle wheel.
Claim 8
Dependent Claim
43 words
A system according to claim 4, further comprising: an additional sensor which generates a further signal representing at least one of the following additional parameters: wheel acceleration, steering angle, yaw rate and speed of the vehicle, said further signal modulating said regulation system.
Claim 9
Dependent Claim
43 words
A system according to claim 5, further comprising: an additional sensor which generates a further signal representing at least one of the following additional parameters: wheel acceleration, steering angle, yaw rate and speed of the vehicle, said further signal modulating said regulation system.
Claim 10
Dependent Claim
43 words
A system according to claim 6, further comprising: an additional sensor which generates a further signal representing at least one of the following additional parameters: wheel acceleration, steering angle, yaw rate and speed of the vehicle, said further signal modulating said regulation system.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-27 | 2001-10-27 | 2002-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-27 | 2005-10-27 | 2006-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-27 | 2009-10-27 | 2010-04-28 | $7700.00 | Window Closed / Lapsed |