Anti-rolling controlling system for automotive active suspension system with road friction dependent variable control characteristics

Claim 2

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, the 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 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 smaller load shift is provided at rear suspension system than that at said front suspension system.

Claim 3

An anti-rolling suspension control system as set forth in claim 1, which further comprises means for detecting road friction representative factor for producing a road friction representative data, and said control signal generating means being responsive to said road friction representative data for varying variation characteristics of said second control signal depending upon the value of said road friction representative data.

Claim 4

An anti-rolling suspension control system as set forth in claim 2, wherein said control signal generating means provides the second control signal variation characteristics for varying said second control signal at limited rate when said road friction representative data indicates low road friction condition.

Claim 5

An anti-rolling suspension control system as set forth in claim 2, wherein said rolling magnitude monitoring means comprises a lateral acceleration sensor.

Claim 6

An anti-rolling suspension control system as set forth in claim 4, wherein said road friction monitoring means comprises said lateral acceleration sensor.

Claim 7

An anti-rolling suspension control system as set forth in claim 4, wherein said road friction monitoring means comprises a first wheel speed sensor for monitoring rotation speed of a driven wheel which is driven by an engine driving torque, a second wheel speed sensor for monitoring rotation speed of a non-driven wheel which is free from said engine driving torque, and means for deriving wheel slippage on the basis of outputs of said first and second wheel speed sensors.

Claim 8

An anti-rolling suspension control system as set forth in claim 5, wherein said control signal deriving means includes first amplifier for amplifying said rolling magnitude indicative signal with a first gain and a second amplifier amplifying said rolling magnitude indicative signal with a second gain which is smaller than said first gain.

Claim 9

An anti-rolling suspension control system as set forth in claim 7, wherein said second amplifier has said second gain variable in non-linear fashion depending upon said road friction representative data value.

Claim 10

An anti-rolling suspension control system as set forth in claim 6, which further comprises a coefficient generating means receiving said rolling magnitude indicative date and the output of said wheel slippage derivation means for deriving a road friction dependent coefficient for modifying said rolling magnitude indicative data.

Claim 11

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, the 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; firct proccuro control valve means associated with said working chamber of the 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 defining variation range of said second control signal within a smaller range than that of the first control signal, and providing smaller gradient of variation for said second control signal than that of said first control signal.

Claim 12

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, the 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; firct proccuro control valve means associated with said working chamber of the 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 defining variation range of said second control signal within a smaller range than that of the first control signal, and providing smaller gradient of variation for said second control signal than that of said first control signal.

Claim 13

An anti-rolling suspension control system as set forth in claim 10, which further comprises means for detecting road friction representative factor for producing a road friction representative data, and said control signal generating means being responsive to said road friction representative data for varying variation characteristics of said second control signal depending upon the value of said road friction representative data.

Claim 14

An anti-rolling suspension control system as set forth in claim 11 wherein said control signal generating means provides the second control signal variation characteristics for varying said second control signal at limited rate when said road friction representative data indicates low road friction condition.

Claim 15

An anti-rolling suspension control system as set forth in claim 11, wherein said rolling magnitude monitoring means comprises a lateral acceleration sensor.

Claim 16

An anti-rolling suspension control system as set forth in claim 13, wherein said road friction monitoring means comprises said lateral acceleration sensor.

Claim 17

An anti-rolling suspension control system as set forth in claim 13, wherein said road friction monitoring means comprises a first wheel speed sensor for monitoring rotation speed of a driven wheel which is driven by an engine driving torque, a second wheel speed sensor for monitoring rotation speed of a non-driven wheel which is free from said engine driving torque, and means for deriving wheel slippage on the basis of outputs of said first and second wheel speed sensors.

Claim 18

An anti-rolling suspension control system as set forth in claim 14, wherein said control signal deriving means includes first amplifier for amplifying said rolling magnitude indicative signal with a first gain and a second amplifier amplifying said rolling magnitude indicative signal with a second gain which is smaller than said first gain.

Claim 19

An anti-rolling suspension control system as set forth in claim 16, wherein said second amplifier has said second gain variable in non-linear fashion depending upon said road friction representative data value.

Claim 20

An anti-rolling suspension control system as set forth in claim 15, which further comprises a coefficient generating means receiving said rolling magnitude indicative data and the output of said wheel slippage derivation means for deriving a road friction dependent coefficient for modifying said rolling magnitude indicative data.

Claim 21

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 road friction condition representative parameter for producing 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 responsive to said road friction data for detecting low road friction condition in order to derive said second control signal for smaller load shift is provided at rear suspension system than that at said front suspension system.

Claim 22

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 road friction condition representative parameter for producing 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 responsive to said road friction data for detecting low road friction condition in order to derive said second control signal for smaller load shift is provided at rear suspension system than that at said front suspension system.

Claim 23

An anti-rolling suspension control system as set forth in claim 19, wherein said control signal generating means provides the second control signal variation characteristics for varying said second control signal at limited rate when said road friction representative data indicates low road friction condition.

Claim 24

An anti-rolling suspension control system as set forth in claim 19, wherein said rolling magnitude monitoring means comprises a lateral acceleration sensor.

Claim 25

An anti-rolling suspension control system as set forth in claim 21, wherein said road friction monitoring means comprises said lateral acceleration sensor.

Claim 26

An anti-rolling suspension control system as set forth in claim 21, wherein said road friction monitoring means comprises a first wheel speed sensor for monitoring rotation speed of a driven wheel which is driven by an engine driving torque, a second wheel speed sensor for monitoring rotation speed of a non-driven wheel which is free from said engine driving torque, and means for deriving wheel slippage on the basis of outputs of said first and second wheel speed sensors.

Claim 27

An anti-rolling suspension control system as set forth in claim 22, wherein said control signal deriving means includes first amplifier for amplifying said rolling magnitude indicative signal with a first gain and a second amplifier amplifying said rolling magnitude indicative signal with a second gain which is smaller than said first gain.

Claim 28

An anti-rolling suspension control system as set forth in claim 24, wherein said second amplifier has said second gain variable in non-linear fashion depending upon said road friction representative data value.

Claim 29

An anti-rolling suspension control system as set forth in claim 23, which further comprises a coefficient generating means receiving said rolling magnitude indicative data and the output of said wheel slippage derivation means for deriving a road friction dependent coefficient for modifying said rolling magnitude indicative data.

Claim 30

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 road friction condition to produce a road friction data; means for deriving first and second control signals on the basis of the 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 variation range of said second control signal within a smaller range that that of said first control signal, and providing 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.

Claim 31

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 road friction condition to produce a road friction data; means for deriving first and second control signals on the basis of the 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 variation range of said second control signal within a smaller range that that of said first control signal, and providing 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.

Claim 32

An anti-rolling suspension control system as set forth in claim 27 wherein said control signal generating means provides the second control signal variation characteristics for varying said second control signal at limited rate when said road friction representative data indicates low road friction condition.

Claim 33

An anti-rolling suspension control system as set forth in claim 27, wherein said rolling magnitude monitoring means comprises a lateral acceleration sensor.

Claim 34

30 An anti-rolling suspension control system as set forth in claim 29, wherein said road friction monitoring means comprises said lateral acceleration sensor.

Claim 35

An anti-rolling suspension control system as set forth in claim 29, wherein said road friction monitoring means comprises a first wheel speed sensor for monitoring rotation speed of a driven wheel which is driven by an engine driving torque, a second wheel speed sensor for monitoring rotation speed of a non-driven wheel which is free from said engine driving torque, and means for deriving wheel slippage on the basis of outputs of said first and second wheel speed sensors.

Claim 36

An anti-rolling suspension control system as set forth in claim 30, wherein said control signal deriving means includes first amplifier for amplifying said rolling magnitude indicative signal with a first gain and a second amplifier amplifying said rolling magnitude indicative signal with a second gain which is smaller than said first gain.

Claim 37

An anti-rolling suspension control system as set forth in claim 32, wherein said second amplifier has said second gain variable in non-linear fashion depending upon said road friction representative data value.

Claim 38

An anti-rolling suspension control system as set forth in claim 30, which further comprises a coefficient generating means receiving said rolling magnitude indicative data and the output of said wheel slippage derivation means for deriving a road friction dependent coefficient for modifying said rolling magnitude indicative data.