Active suspension system for an automotive vehicle with slip angle dependent control for enhanced steering 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 and variable of the 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 and variable of the 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 monitoring a vehicular driving parameter representative of demand for vehicular stability factor for producing a stability factor demand indicative signal representative thereof;
means for deriving first and second control signals on the basis of said rolling magnitude indicative signal and first and second coefficient values order to control said first and second pressure control valve means for inducing counter rolling at a controlled magnitude, said control signal deriving means varying said first and second coefficient values depending upon said stability factor demand indicative signal value so as to vary vehicular steering characteristics.
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Abstract
An active suspension control system performs anti-rolling control in response to vehicular rolling by inducing counter rolling in a direction opposite to the vehicular body rolling direction. Magnitude of counter rolling is differentiated between front and rear suspension systems for providing desired steering characteristics. The steering characteristics is adjusted depending on the demand on stability factor in cornering.
21 Citations
23 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 and variable of the 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 and variable of the 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 monitoring a vehicular driving parameter representative of demand for vehicular stability factor for producing a stability factor demand indicative signal representative thereof; means for deriving first and second control signals on the basis of said rolling magnitude indicative signal and first and second coefficient values order to control said first and second pressure control valve means for inducing counter rolling at a controlled magnitude, said control signal deriving means varying said first and second coefficient values depending upon said stability factor demand indicative signal value so as to vary vehicular steering characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. 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 and variable of the 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 and variable of the 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 monitoring a vehicular driving parameter affecting for vehicular stability factor for producing a parameter signal representative thereof means for deriving first and second control signals on the basis of said rolling magnitude indicative signal and first and second coefficient values order to control said first and second pressure control valve means for suppressing vehicular rolling, said control signal deriving means varying said first and second coefficient values depending upon said parameter signal value. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification