Anti-rolling controlling system for automotive active suspension system with road friction dependent variable control characteristics
First Claim
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1. An anti-rolling control system for an automotive suspension system comprising:
- a front suspension system disposed between a vehicular body and a suspension member rotatably supporting a front wheel, said front suspension system defining a working chamber filled with a working fluid having a variable fluid pressure within said working chamber for adjusting suspension characteristics;
a rear suspension system disposed between a vehicular body and a suspension member rotatably supporting a rear wheel, said suspension system defining a working chamber filled with a working fluid having a variable fluid pressure within said working chamber for adjusting suspension characteristics;
first pressure control valve means associated with said working chamber of said front suspension system for controlling introduction and draining of working fluid into and from said working chamber for adjusting the fluid pressure therein;
second pressure control valve means associated with said working chamber of said rear suspension system for controlling introduction and draining of working fluid into and from said working chamber for adjusting the fluid pressure therein;
means for monitoring vehicular rolling magnitude for producing a rolling magnitude indicative signal;
means for deriving first and second control signals on the basis of said rolling magnitude indicative signal in order to control said first and second pressure control valve means for suppressing vehicular rolling, said control signal deriving means deriving said second control signal in such a manner that a smaller lateral load shift is provided at the rear suspension system than at said front suspension system, said control signal deriving means providing the second control signal variation characteristics for varying said control signal at a smaller rate than said first control signal when said road friction representative data indicates a low road friction condition; and
means for detecting a road friction representative factor for producing road friction representative data, and said control signal deriving means being responsive to said road friction representative data for varying variation characteristics of said second control signal depending on the value of said road friction representative data.
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Abstract
An anti-rolling suspension control system generally derives anti-rolling control signals for controlling suspension characteristics of respective suspension systems in order to suppress vehicular rolling motion. The system is further provided means for monitoring road friction condition. The system derives distribution of rolling moment distribution ratio between front suspension systems and rear suspension systems based on the monitored road friction condition so that the derived distribution may be adapted to the road surface frictional condition.
27 Citations
22 Claims
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1. An anti-rolling control system for an automotive suspension system comprising:
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a front suspension system disposed between a vehicular body and a suspension member rotatably supporting a front wheel, said front suspension system defining a working chamber filled with a working fluid having a variable fluid pressure within said working chamber for adjusting suspension characteristics; a rear suspension system disposed between a vehicular body and a suspension member rotatably supporting a rear wheel, said suspension system defining a working chamber filled with a working fluid having a variable fluid pressure within said working chamber for adjusting suspension characteristics; first pressure control valve means associated with said working chamber of said front suspension system for controlling introduction and draining of working fluid into and from said working chamber for adjusting the fluid pressure therein; second pressure control valve means associated with said working chamber of said rear suspension system for controlling introduction and draining of working fluid into and from said working chamber for adjusting the fluid pressure therein; means for monitoring vehicular rolling magnitude for producing a rolling magnitude indicative signal; means for deriving first and second control signals on the basis of said rolling magnitude indicative signal in order to control said first and second pressure control valve means for suppressing vehicular rolling, said control signal deriving means deriving said second control signal in such a manner that a smaller lateral load shift is provided at the rear suspension system than at said front suspension system, said control signal deriving means providing the second control signal variation characteristics for varying said control signal at a smaller rate than said first control signal when said road friction representative data indicates a low road friction condition; and
means for detecting a road friction representative factor for producing road friction representative data, and said control signal deriving means being responsive to said road friction representative data for varying variation characteristics of said second control signal depending on the value of said road friction representative data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An anti-rolling control system for an automotive suspension system comprising:
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a front suspension system disposed between a vehicular body and a suspension member rotatably supporting a front wheel, said front suspension system defining a working chamber filled with a working fluid having a variable fluid pressure within said working chamber for adjusting suspension characteristics; a rear suspension system disposed between a vehicular body and a suspension member rotatably supporting a rear wheel, said suspension system defining a working chamber filled with a working fluid having a variable fluid pressure within aid working chamber for adjusting suspension characteristics; first pressure control valve means associated with said working chamber of said front suspension system for controlling introduction and draining of working fluid into and from said working chamber for adjusting the fluid pressure therein; second pressure control valve means associated with said working chamber of said rear suspension system for controlling introdution and draining of working fluid into and from said working chamber for adjusting the fluid pressure therein; means for monitoring vehicular rolling magnitude for producing a rolling magnitude indicative signal; means for deriving first and second control signals on the basis of said rolling magnitude indicative signal in order to control said first and second pressure control valve means for suppressing vehicular rolling, said control signal deriving means defining a variation range of said second control signal which is a smaller range than that of said first control signal, and providing a smaller gradient of variation for said second control signal than that of said first control signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An anti-rolling control system for an automotive suspension system comprising:
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a front suspension system disposed between a vehicular body and a suspension member rotatably supporting a front wheel, said front suspension system defining a working chamber filled with a working fluid having a variable fluid pressure within said working chamber for adjusting suspension characteristics; a rear suspension system disposed between a vehicular body and a suspension member rotatably supporting a rear wheel, said suspension system defining a working chamber filled with a working fluid having a variable fluid pressure within said working chamber for adjusting suspension characteristics; a rear suspension system disposed between a vehicular body and a suspension member rotatably supporting a rear wheel, said suspension system defining a working chamber filled with a working fluid having a variable fluid pressure within said working chamber for adjusting suspension characteristics; first pressure control valve means associated with said working chamber of said front suspension system for controlling introduction and draining of working fluid into and from aid working chamber for adjusting the fluid pressure therein; second pressure control valve means associated with said working chamber of said rear suspension system for controlling introduction and draining of working fluid into and from aid working chamber for adjusting the fluid pressure therein; means for monitoring vehicular rolling magnitude for producing a rolling magnitude indicative signal; means for monitoring road friction condition to produce a road friction data; means for deriving first and second control signals on the basis of said rolling magnitude indicative signal in order to control said first and second pressure control valve means for suppressing vehicular rolling, said control signal deriving means defining a variation range of said second control signal which is a smaller range than that of said first control signal, and providing a smaller gradient of variation for said second control signal than that of said first control signal, which gradient of variation of said second control signal is variable depending upon said road friction data. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification