Patent US4756549A successfully refreshed from Google Patents.
US4756549A
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Shock absorber controller
Assignee: Toyota Motor Corp
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Filing: 1986-10-24
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Granted: 1988-07-12
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Expires: 2006-10-24
Abstract
Abstract This controller controls a varible damping force shock absorber taking the cycle time and the oscillating phase of the body vibration. The controller increases the damping force when the body is moving toward its mean position. Before that, the damping force is kept weak so that the body vibration is hastened to become moving toward the mean position. Some criteria for determining that the body is moving toward its mean position are proposed.
Inventors
- 👤 Ryuichi Kurosawa
- 👤 Hirohide Iwase
- 👤 Yukio Yamamoto
- 👤 Ryushi Tanaka
- 👤 Takashi Shirasu
- 👤 Susumu Oda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:40
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/06; B60G17/08; B60G17/015; B60G17/016; B60G17/0165; B60G17/018; B60G2400/00; B60G2400/80; B60G2400/82; B60G2400/821; B60G2500/00; B60G2500/30; B60G2600/00; B60G2600/02; B60G2800/00; B60G2800/16; B60G2800/162; Y; Y10; Y10S; Y10S280/00; Y10S280/01
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
69 words
A shock absorber controller for a vehicle suspension comprising: vertical movement detection means for detecting a vertical movement of a body of the vehicle; control means for delaying generation of a damping force alteration signal until a time point when the body is moving toward a mean position; and damping force alteration means responsive to the damping force alteration signal for increasing a damping force of each shock absorber.
Claim 2
Dependent Claim
69 words
A shock absorber controller for a vehicle suspension comprising: vertical movement detection means for detecting a vertical movement of a body of the vehicle; control means for delaying generation of a damping force alteration signal until a time point when the body is moving toward a mean position; and damping force alteration means responsive to the damping force alteration signal for increasing a damping force of each shock absorber.
Claim 3
Dependent Claim
75 words
A shock absorber controller for a vehicle suspension according to claim 1, wherein: the vertical movement detection means comprise a body height detection means for generating a body height signal; and the control means delays generation of the damping force alteration signal until a time point within a period in which the body height signal change is going toward a mean body height, the mean body height corresponding to the mean position of the body.
Claim 4
Dependent Claim
62 words
A shock absorber controller for a vehicle suspension according to claim 2, wherein the control means sets the time point at a predetermined period after the body height signal exceeds a first predetermined range including the mean body height, the period being determined to be no greater than a semi-cycle period of the resonant vibration of the sprung mass of the vehicle.
Claim 5
Dependent Claim
61 words
A shock absorber controller for a vehicle suspension according to claim 2 wherein the control means sets the time point at a predetermined period after the body height signal attains a first local maximum or first local minimum since the body height signal exceeds the first predetermined range but before the body height signal is equal to the mean body height.
Claim 6
Dependent Claim
49 words
A shock absorber controller for a vehicle suspension according to claim 4, wherein the control means determines that the body height has attained the first local maximum or the first local minimum when a difference of sequent two detected body height signals is less than a predetermined small value.
Claim 7
Dependent Claim
63 words
A shock absorber controller for a vehicle suspension according to claim 1, wherein: the vertical movement detection means comprise an acceleration detection means for detecting a vertical acceleration of the body and for generating an acceleration signal; and the control means delays generation of the damping force alteration signal until a predetermined period after the acceleration signal exceeds a predetermined range including zero.
Claim 8
Dependent Claim
49 words
A shock absorber controller for a vehicle suspension according to claim 6, wherein: the control means delays generation of the damping force alteration signal until another predetermined period after the acceleration signal attains a first local maximum or first local minimum after the acceleration signal exceeds the predetermined range.
Claim 9
Dependent Claim
48 words
A shock absorber controller for a vehicle suspension according to claim 7, wherein the control means determines that the acceleration signal has attained the first local maximum or the first local minimum when a difference of sequent two detected acceleration signals is less than a predetermined small value.
Claim 10
Dependent Claim
84 words
A shock absorber controller for a vehicle suspension according to claim 1, wherein: the vertical movement detection means comprise a body height detection means for generating a body height signal; and the control means delays generation of the damping force alteration signal until a predetermined period after the body height signal attains a local maximum or a local minimum but before the body height signal is equal to a mean body height, the mean body height corresponding to the mean position of the body.
Claim 11
Dependent Claim
61 words
A shock absorber controller for a vehicle suspension according to claim 9, wherein the control means delays generation of the damping force alteration signal until the predetermined period after the body height signal attains the local maximum or the local minimum if the body height signal change is going toward the mean value of the body height during the predetermined period.
Claim 12
Dependent Claim
41 words
A shock absorber controller for a vehicle suspension according to claim 9, wherein the control means determines that the body height has attained the local minimum or the local minimum when an absolute value of the detected body height first decreases.
References Cited (Backward Citations)
US3555391A
Cited
GB1450765A
Cited
US4344128A
Cited
US4616163A
Cited
US4598929A
Cited
US4491207A
Cited
EP0139145A1
Cited
US4589676A
Cited
US4612489A
Cited
US4696489A
Cited
EP0197316A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |