US4943084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Actively controlled suspension system for suppressing attitude change of vehicular body
Assignee: Nissan Motor Co Ltd
•
Filing: 1988-10-11
•
Granted: 1990-07-24
•
Expires: 2008-10-11
Abstract
Abstract A suspension control system detects acceleration exerted on the vehicular body and close to a predetermined critical value. When the acceleration greater than the predetermined critical value, total stiffness of the suspension system is adjusted to be smaller value to allow attitude change of the vehicle body in a predetermined magnitude. Therefore, rolling or pitching is caused as a sign that traction of the suspension tends to break. This makes a driver to recognize that the vehicular driving condition is near the critical condition.
Inventors
- 👤 Yukio Fukunaga
- 👤 Naoto Fukushima
- 👤 Yohsuke Akatsu
- 👤 Sunao Hano
- 👤 Masaharu Satoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:05
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/018; B60G17/0185; B60G2400/00; B60G2400/10; B60G2400/104; B60G2400/106; B60G2400/40; B60G2400/41; B60G2400/44; B60G2400/50; B60G2600/00; B60G2600/07; B60G2600/18; B60G2600/22; B60G2600/26; B60G2600/72; B60G2800/00; B60G2800/01; B60G2800/012; B60G2800/014; B60G2800/22; B60G2800/24
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
194 words
A control system for an automotive suspension system for controlling vehicular attitude comprising: a suspension system disposed between a vehicle body and a suspension member which rotatably supports a vehicular wheel, said suspension system having a variable pressure chamber filled with a working fluid of controlled pressure a pressure adjusting means, associated with said variable pressure chamber, for adjusting the pressure of said working fluid in said pressure chamber a sensor means monitoring acceleration causing vehicular attitude chamber to produce a first sensor signal indicative of said measured acceleration a control unit receiving said first sensor signal, deriving suspension control signal value on the basis of said first sensor signal for suppressing attitude change, said control unit outputting a control signal to control said pressure adjusting means for adjusting suspension characteristics to suppress vehicular attitude change, said control unit being responsive to said first sensor signal representative of an acceleration greater than a predetermined value for deriving said suspension control signal to allow a given magnitude of attitude change wherein said control unit increases the magnitude of attitude change according to increasing of the accelerator when said acceleration is greater than said predetermined value.
Claim 2
Dependent Claim
194 words
A control system for an automotive suspension system for controlling vehicular attitude comprising: a suspension system disposed between a vehicle body and a suspension member which rotatably supports a vehicular wheel, said suspension system having a variable pressure chamber filled with a working fluid of controlled pressure a pressure adjusting means, associated with said variable pressure chamber, for adjusting the pressure of said working fluid in said pressure chamber a sensor means monitoring acceleration causing vehicular attitude chamber to produce a first sensor signal indicative of said measured acceleration a control unit receiving said first sensor signal, deriving suspension control signal value on the basis of said first sensor signal for suppressing attitude change, said control unit outputting a control signal to control said pressure adjusting means for adjusting suspension characteristics to suppress vehicular attitude change, said control unit being responsive to said first sensor signal representative of an acceleration greater than a predetermined value for deriving said suspension control signal to allow a given magnitude of attitude change wherein said control unit increases the magnitude of attitude change according to increasing of the accelerator when said acceleration is greater than said predetermined value.
Claim 3
Dependent Claim
34 words
An actively controlled suspension system as set forth in claim 1, wherein said sensor means monitors lateral acceleration exerted on the vehicular body and said control unit performs suspension control for suppressing vehicular rolling.
Claim 4
Dependent Claim
250 words
A control system for an automotive suspension system for controlling vehicular attitude comprising: a suspension system disposed between a vehicle body and a suspension member which rotatably supports a vehicular wheel, said suspension system having a variable pressure chamber filled with a working fluid of controlled pressure a pressure adjusting means, associated with said variable pressure chamber, for adjusting the pressure of said working fluid in said pressure chamber a sensor means monitoring acceleration causing vehicular attitude chamber to produce a first sensor signal indicative of said measured acceleration a control unit receiving said first sensor signal, deriving suspension control signal value on the basis of said first sensor signal for suppressing attitude change, said control unit outputting a control signal to control said pressure adjusting means for adjusting suspension characteristics to suppress vehicular attitude change, said control unit being responsive to said first sensor signal representative of an acceleration greater than a predetermined value for deriving said suspension control signal to allow a given magnitude of attitude change, wherein said control unit comprises a coefficient generator means for generating a coefficient variable depending upon the acceleration, which coefficient is maintained at a preset greatest value while said acceleration is smaller than or equal to said predetermined value and decreases in a manner inversely proportional to acceleration when the acceleration is greater than said predetermined value, and said control unit derives said suspension control signal value on the basis of said acceleration representing first sensor signal value and said coefficient.
Claim 5
Dependent Claim
250 words
A control system for an automotive suspension system for controlling vehicular attitude comprising: a suspension system disposed between a vehicle body and a suspension member which rotatably supports a vehicular wheel, said suspension system having a variable pressure chamber filled with a working fluid of controlled pressure a pressure adjusting means, associated with said variable pressure chamber, for adjusting the pressure of said working fluid in said pressure chamber a sensor means monitoring acceleration causing vehicular attitude chamber to produce a first sensor signal indicative of said measured acceleration a control unit receiving said first sensor signal, deriving suspension control signal value on the basis of said first sensor signal for suppressing attitude change, said control unit outputting a control signal to control said pressure adjusting means for adjusting suspension characteristics to suppress vehicular attitude change, said control unit being responsive to said first sensor signal representative of an acceleration greater than a predetermined value for deriving said suspension control signal to allow a given magnitude of attitude change, wherein said control unit comprises a coefficient generator means for generating a coefficient variable depending upon the acceleration, which coefficient is maintained at a preset greatest value while said acceleration is smaller than or equal to said predetermined value and decreases in a manner inversely proportional to acceleration when the acceleration is greater than said predetermined value, and said control unit derives said suspension control signal value on the basis of said acceleration representing first sensor signal value and said coefficient.
Claim 6
Dependent Claim
174 words
An anti-roll control system for an automotive suspension system for suppressing vehicular rolling, comprising: a suspension system disposed between a vehicle body and a suspension member which rotatably supports a vehicular wheel, said suspension system having a variable pressure chamber filled with a working fluid of controlled pressure a pressure adjusting means, associated with said variable pressure chamber, for adjusting the pressure of said working fluid in said pressure chamber a sensor means monitoring lateral acceleration causing vehicular rolling to produce a lateral acceleration indicative sensor signal a control unit receiving said first sensor signal, deriving suspension control signal value on the basis of said first sensor signal for suppressing rolling, said control unit outputting a control signal to control said pressure adjusting means for adjusting damping characteristics to suppress vehicular rolling, said control unit being responsive to said first sensor signal representative of lateral acceleration greater than a predetermined value which represents the lateral acceleration close to a critical acceleration for deriving said suspension control signal to allow a given magnitude of rolling.
Claim 7
Dependent Claim
174 words
An anti-roll control system for an automotive suspension system for suppressing vehicular rolling, comprising: a suspension system disposed between a vehicle body and a suspension member which rotatably supports a vehicular wheel, said suspension system having a variable pressure chamber filled with a working fluid of controlled pressure a pressure adjusting means, associated with said variable pressure chamber, for adjusting the pressure of said working fluid in said pressure chamber a sensor means monitoring lateral acceleration causing vehicular rolling to produce a lateral acceleration indicative sensor signal a control unit receiving said first sensor signal, deriving suspension control signal value on the basis of said first sensor signal for suppressing rolling, said control unit outputting a control signal to control said pressure adjusting means for adjusting damping characteristics to suppress vehicular rolling, said control unit being responsive to said first sensor signal representative of lateral acceleration greater than a predetermined value which represents the lateral acceleration close to a critical acceleration for deriving said suspension control signal to allow a given magnitude of rolling.
Claim 8
Dependent Claim
34 words
An anti-rolling control system as set forth in claim 4, wherein said control unit increases the magnitude of rolling according to increasing of the acceleration when said acceleration is greater than said predetermined value.
Claim 9
Dependent Claim
91 words
An anti-rolling control system as set forth in claim 4, wherein said control unit comprises a coefficient generator means for generating a coefficient variable depending upon the acceleration, which coefficient is maintained at a preset greatest value while said acceleration is smaller than or equal to said predetermined value and decreases in a manner inversely proportional to acceleration when the acceleration is greater than said predetermined value, and said control unit derives said suspension control signal value on the basis of said acceleration representing first sensor signal value and said coefficient.
Claim 10
Dependent Claim
33 words
An anti-rolling control system as set forth in claim 4, wherein said sensor means monitors lateral acceleration exerted on the vehicular body and said control unit performed suspension control for suppressing vehicular rolling.
Claim 11
Dependent Claim
174 words
An anti-pitching control system for an automotive suspension system for suppressing vehicular pitching, comprising: a suspension system disposed between a vehicle body and a suspension member which rotatably supports a vehicular wheel, said suspension system having a variable pressure chamber filled with a working fluid of controlled pressure a pressure adjusting means, associated with said variable pressure chamber, for adjusting the pressure of said working fluid in said pressure chamber a sensor means monitoring longitudinal acceleration causing vehicular pitching to produce a longitudinal acceleration indicative sensor signal a control unit receiving said first sensor signal, deriving suspension control signal value on the basis of said first sensor signal for suppressing pitching, said control unit outputting a control signal to control said pressure adjusting means for adjusting damping characteristics to suppress vehicular pitching, said control unit being responsive to said first sensor signal representative of longitudinal acceleration greater than a predetermined value which represents the longitudinal acceleration close to a critical acceleration for deriving said suspension control signal to allow a given magnitude of pitching.
Claim 12
Dependent Claim
174 words
An anti-pitching control system for an automotive suspension system for suppressing vehicular pitching, comprising: a suspension system disposed between a vehicle body and a suspension member which rotatably supports a vehicular wheel, said suspension system having a variable pressure chamber filled with a working fluid of controlled pressure a pressure adjusting means, associated with said variable pressure chamber, for adjusting the pressure of said working fluid in said pressure chamber a sensor means monitoring longitudinal acceleration causing vehicular pitching to produce a longitudinal acceleration indicative sensor signal a control unit receiving said first sensor signal, deriving suspension control signal value on the basis of said first sensor signal for suppressing pitching, said control unit outputting a control signal to control said pressure adjusting means for adjusting damping characteristics to suppress vehicular pitching, said control unit being responsive to said first sensor signal representative of longitudinal acceleration greater than a predetermined value which represents the longitudinal acceleration close to a critical acceleration for deriving said suspension control signal to allow a given magnitude of pitching.
Claim 13
Dependent Claim
34 words
An anti-pitching control system as set forth in claim 8, wherein said control unit increases the magnitude of pitching according to increasing of the acceleration when said acceleration is greater than said predetermined value.
Claim 14
Dependent Claim
91 words
An anti-pitching control system as set forth in claim 8, wherein said control unit comprises a coefficient generator means for generating a coefficient variable depending upon the acceleration, which coefficient is maintained at a preset greatest value while said acceleration is smaller than or equal to said predetermined value and decreases in a manner inversely proportional to acceleration when the acceleration is greater than said predetermined value, and said control unit derives said suspension control signal value on the basis of said acceleration representing first sensor signal value and said coefficient.
Claim 15
Dependent Claim
33 words
An anti-pitching control system as set forth in claim 8, wherein said sensor means monitors longitudinal acceleration exerted on the vehicular body and said control unit performed suspension control for suppressing vehicular pitching.
References Cited (Backward Citations)
US3992039A
Cited
EP0193124A2
Cited
US4702490A
Cited
US4743000A
Cited
US4763745A
Cited
US4763222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-23 | 1994-01-22 | 1994-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-23 | 1998-01-22 | 1998-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-23 | 2002-01-22 | 2002-07-24 | $7700.00 | Window Closed / Lapsed |