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US5138554A
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Suspension controller
Assignee: Mitsubishi Electric Corp
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Filing: 1990-04-04
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Granted: 1992-08-11
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Expires: 2010-04-04
Abstract
Abstract In the suspension controller of the present invention, there is provided a suspension or stabilizer characteristic change-over determining device whereby a damping force or a spring constant of a suspension or a torsional force of a stabilizer is calculated from a degree of similarity corresponding to a physical amount which exerts influence on the suspension or stabilizer characteristics and a state amount, using fuzzy logic, and when it is enhanced, this enhanced state of the suspension or the stabilizer is maintained for a set time. If during this period a set value of the damping force or the spring constant or the torsional force corresponding to the output which is responsive to the degree of similarity indicates a rather low state for a predetermined time or longer, the value of the damping force or the spring constant or the torsional force is set low and this state is maintained for a set time. There is also provided a suspension or stabilizer characteristic change-over operating device which is controlled by the change-over determining device and controls the characteristics of the suspension or the stabilizer in a variable manner.
Inventors
- 👤 Shunichi Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:02
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/018; B60G17/0182; B60G2202/00; B60G2202/10; B60G2202/13; B60G2202/135; B60G2202/20; B60G2400/00; B60G2400/10; B60G2400/102; B60G2400/104; B60G2400/106; B60G2400/20; B60G2400/204; B60G2400/30; B60G2400/34; B60G2400/40; B60G2400/44; B60G2400/90; B60G2400/91; B60G2500/00; B60G2500/10; B60G2500/102; B60G2500/20; B60G2600/00; B60G2600/90; Y; Y10; Y10S; Y10S706/00; Y10S706/90
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
251 words
A suspension controller comprising: a state detecting means for detecting amounts of physical exertions on a vehicle body which influence characteristics of a vehicle body supporting suspension and stabilizer and a state amount representative of a movement of the said vehicle body; a change-over determining means for calculating in accordance with fuzzy logic a degree of similarity corresponding to said amounts of physical exertions and state amount, calculating based on said degree of similarity a requirement index for comfortableness and driving stability of said vehicle body, combining requirement indices corresponding to said amounts of physical exertions and state amount, and calculating a damping force and spring constant of said suspension and a torsional force of said stabilizer based on the combined requirement indices, such that when one of said damping force, spring constant, and torsional force is in a first state, said first state of one of said suspension, and stabilizer is maintained for a first predetermined time, and when a set value of one of said damping force, spring constant, and stabilizer's torsional force corresponding to an output which is responsive to said degree of similarity indicates a second state for at least a predetermined time, said one of said damping force, spring constant, and torsional force is set to said second state and maintained at said second state for a second predetermined time; and a suspension operating means responsive to an output of said change-over determining means for controlling characteristics of said suspension and stabilizer in a variable manner.
Claim 2
Dependent Claim
251 words
A suspension controller comprising: a state detecting means for detecting amounts of physical exertions on a vehicle body which influence characteristics of a vehicle body supporting suspension and stabilizer and a state amount representative of a movement of the said vehicle body; a change-over determining means for calculating in accordance with fuzzy logic a degree of similarity corresponding to said amounts of physical exertions and state amount, calculating based on said degree of similarity a requirement index for comfortableness and driving stability of said vehicle body, combining requirement indices corresponding to said amounts of physical exertions and state amount, and calculating a damping force and spring constant of said suspension and a torsional force of said stabilizer based on the combined requirement indices, such that when one of said damping force, spring constant, and torsional force is in a first state, said first state of one of said suspension, and stabilizer is maintained for a first predetermined time, and when a set value of one of said damping force, spring constant, and stabilizer's torsional force corresponding to an output which is responsive to said degree of similarity indicates a second state for at least a predetermined time, said one of said damping force, spring constant, and torsional force is set to said second state and maintained at said second state for a second predetermined time; and a suspension operating means responsive to an output of said change-over determining means for controlling characteristics of said suspension and stabilizer in a variable manner.
Claim 3
Dependent Claim
59 words
A suspension controller according to claim 1, wherein said state detecting means comprises means for detecting an acceleration in a vertical direction of said vehicle body, means for detecting a vehicle speed, means for detecting a steering angular velocity, means for detecting an accelerator opening, and means for detecting an acceleration in a transverse direction of said vehicle body.
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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) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |