EP0285153A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Actively controlled automotive suspension system with acceleration and angular velocity dependent anti-pitching and/or anti-rolling feature
Assignee: Nissan Motor Co Ltd
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Filing: 1988-03-30
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Granted: —
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Expires: 2008-03-30
Abstract
Abstract In an actively controlled automotive suspension system, suspension characteristics are controlled on the basis of rolling and/or pitching energy representing parameters. A correction factor (SF,SR) representative of self-induced attitude change is derived on the basis of vehicular attitude change velocity ( phi /<.>) for cancelling the self-induced rolling and/or pitching. By cancelling the self-induced rolling and/or pitching creative component from the rolling and/or pitching acceleration factor, higher rolling and /or pitching response characteristics can be provided so as to obtain satisfactorily high driving stability and riding comfort.
Inventors
- 👤 Yohsuke Akatsu
- 👤 Naoto Fukushima
- 👤 Yukio Fukunaga
- 👤 Sunao Hano
- 👤 Masaharu Sato
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 04:35
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/015; B60G17/016
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
229 words
A control system for an automotive suspension system for controlling vehicular attitude, comprising: - a suspension system (15) disposed between a vehicle body (12) and a suspension member (13) which rotatably supports a vehicular wheel (14FR,14FL,14RR,14RL), said suspension system having a variable pressure chamber (15a) filled with a working fluid of controlled pressure; - pressure adjusting means (18) associated with said variable pressure chamber, for adjusting the pressure of said working fluid in said pressure chamber; - sensor means (110;112;114FR,114FL,114RR,114RL) for monitoring change in vehicular attitude; and - a control unit (100) receiving signals from said sensor means and outputting a control signal to control said pressure adjusting means for adjusting suspension characteristics to suppress vehicular attitude change; characterized in that said sensor means comprise: - first sensor means (110;112) monitoring acceleration in vehicular attitude change to produce a first sensor means signal (S y ,S x ) indicative of said attitude change acceleration; and - second sensor means (117F,117R) monitoring self-induced attitude change creative component which is contained in said first sensor means signal, to produce a second sensor means signal (S L ,S R ;S F ,S R ) indicative thereof; - said control unit (100) deriving a suspension control signal value on the basis of said first sensor means signal and modifying said suspension control signal value on the basis of said second sensor means signal.
Claim 2
Dependent Claim
229 words
A control system for an automotive suspension system for controlling vehicular attitude, comprising: - a suspension system (15) disposed between a vehicle body (12) and a suspension member (13) which rotatably supports a vehicular wheel (14FR,14FL,14RR,14RL), said suspension system having a variable pressure chamber (15a) filled with a working fluid of controlled pressure; - pressure adjusting means (18) associated with said variable pressure chamber, for adjusting the pressure of said working fluid in said pressure chamber; - sensor means (110;112;114FR,114FL,114RR,114RL) for monitoring change in vehicular attitude; and - a control unit (100) receiving signals from said sensor means and outputting a control signal to control said pressure adjusting means for adjusting suspension characteristics to suppress vehicular attitude change; characterized in that said sensor means comprise: - first sensor means (110;112) monitoring acceleration in vehicular attitude change to produce a first sensor means signal (S y ,S x ) indicative of said attitude change acceleration; and - second sensor means (117F,117R) monitoring self-induced attitude change creative component which is contained in said first sensor means signal, to produce a second sensor means signal (S L ,S R ;S F ,S R ) indicative thereof; - said control unit (100) deriving a suspension control signal value on the basis of said first sensor means signal and modifying said suspension control signal value on the basis of said second sensor means signal.
Claim 3
Dependent Claim
30 words
A control system as set forth in claim 1, wherein said second sensor means (117F,117R) monitor velocity of attitude change for deriving said self-induced attitude change creative component based thereon.
Claim 4
Dependent Claim
56 words
A control system as set forth in claim 1 or 2, wherein said first sensor means includes means (116) for determining response characteristics of suspension control in response to attitude change acceleration, and said second sensor means include means (124F,124R) for determining response characteristics of suspension control in response to said self-induced attitude change creative component.
Claim 5
Dependent Claim
40 words
A control system as set forth in any of the preceding claims, wherein each of said response characteristics determining means of said first and second sensor means comprises an amplifier (116,124F,124R) provided with a given gain which determines response characteristics.
Claim 6
Dependent Claim
76 words
A control system as set forth in any of the preceding claims, which is designed to perform anti-rolling suspension control for suppressing rolling motion of the vehicle, wherein said first sensor means (110) is designed to monitor lateral acceleration for producing a lateral acceleration indicative first sensor signal (G y ) and said second sensor means is designed to monitor rolling velocity for producing a rolling velocity indicative second sensor signal (φ̇ F ,φ̇ R ).
Claim 7
Dependent Claim
72 words
A control system as set forth in any of the preceding claims, which is designed to perform anti-pitching suspension control for suppressing pitching motion of the vehicle, wherein said first sensor means (112) are designed to monitor longitudinal acceleration for producing a longitudinal acceleration indicative first sensor signal (G x ), and said second sensor means are designed to monitor pitching velocity for producing a pitching velocity indicative second sensor signal (β̇).
Claim 8
Dependent Claim
88 words
A control system as set forth in any of the preceding claims, wherein said pressure adjusting means comprises a pressurized fluid source (20) connected to said variable pressure chamber (15a) and a pressure control valve (18) incorporating an electrically operable actuator (22), said actuator being connected to said control unit (100) to receive said control signal to operate said pressure control valve for adjusting the amount of working fluid to be introduced into and removed from said variable pressure chamber for adjusting damping characteristics of said suspension system.
References Cited (Backward Citations)
No citation records indexed.
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