Attitude change suppressive vehicular height regulation system
First Claim
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1. A vehicular height regulation system comprising:
- a first fluid actuator provided in a first suspension system disposed between a first side of a vehicular body and a first road wheel, said first actuator being variable of fluid pressure for adjusting relative distance between said first side of the vehicular body and said first road wheel;
a second fluid actuator provided in a second suspension system disposed between a second side of the vehicular body opposite to said first side and a second road wheel, said second fluid actuator being variable of fluid pressure for adjusting relative distance between said second side of the vehicular body and said second road wheel;
a fluid pressure source circuit connected to said first and second actuators, said fluid pressure source circuit incorporating a first valve means for adjusting fluid pressure in said first fluid actuator and a second valve means for adjusting fluid pressure in said second fluid actuator;
a sensor means for monitoring a preselected parameter affected by vehicular attitude and variable depending upon magnitude and direction of vehicular body attitude change for producing an attitude change representative signal;
means for processing said attitude change representative signal for deriving vehicular body attitude change representative data;
a target attitude change magnitude setting means for setting a target attitude change magnitude and generating reference data representative of said target attitude change magnitude;
means for comparing said vehicular attitude change representative data and said reference data for deriving difference data representative of a difference therebetween; and
a controlling means, responsive to said difference data, for deriving first and second control signals which have opposite polarity to each other, for controlling said first and second valve means for reducing the difference between said vehicular attitude change representative data and said reference data to zero.
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Abstract
A vehicular height regulation system performs attitude change suppressive suspension control for equalized magnitude at respective of front and rear wheels. For performing equalized magnitude not only for the front suspension systems, the vehicular height control system includes a pair of actuator means associated with respective of rear-left and rear-right wheels, which actuator means are operable independently of each of other.
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Citations
25 Claims
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1. A vehicular height regulation system comprising:
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a first fluid actuator provided in a first suspension system disposed between a first side of a vehicular body and a first road wheel, said first actuator being variable of fluid pressure for adjusting relative distance between said first side of the vehicular body and said first road wheel; a second fluid actuator provided in a second suspension system disposed between a second side of the vehicular body opposite to said first side and a second road wheel, said second fluid actuator being variable of fluid pressure for adjusting relative distance between said second side of the vehicular body and said second road wheel; a fluid pressure source circuit connected to said first and second actuators, said fluid pressure source circuit incorporating a first valve means for adjusting fluid pressure in said first fluid actuator and a second valve means for adjusting fluid pressure in said second fluid actuator; a sensor means for monitoring a preselected parameter affected by vehicular attitude and variable depending upon magnitude and direction of vehicular body attitude change for producing an attitude change representative signal; means for processing said attitude change representative signal for deriving vehicular body attitude change representative data; a target attitude change magnitude setting means for setting a target attitude change magnitude and generating reference data representative of said target attitude change magnitude; means for comparing said vehicular attitude change representative data and said reference data for deriving difference data representative of a difference therebetween; and a controlling means, responsive to said difference data, for deriving first and second control signals which have opposite polarity to each other, for controlling said first and second valve means for reducing the difference between said vehicular attitude change representative data and said reference data to zero. - View Dependent Claims (2, 3, 4, 5)
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6. An anti-rolling control system for a vehicular height regulation system comprising:
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a first fluid actuator provided in a first suspension system disposed between a first side of a vehicular body and a first road wheel, said first actuator being variable of fluid pressure for adjusting relative distance between said first side of the vehicular body and said first road wheel; a second fluid actuator provided in a second suspension system disposed between a second side of the vehicular body transversely oriented opposite to said first side and a second road wheel, said second fluid actuator being variable of fluid pressure for adjusting relative distance between said second side of the vehicular body and said second road wheel; a fluid pressure source circuit connected to said first and second actuators, said fluid pressure source circuit incorporating a first valve means for adjusting fluid pressure in said first fluid actuator and a second valve means for adjusting fluid pressure in said second fluid actuator; a sensor means for monitoring a preselected parameter affected by vehicular attitude and variable depending upon magnitude and direction of vehicular body rolling for producing a rolling representative signal; means for processing said rolling representative signal for deriving vehicular rolling representative data; a target rolling magnitude setting means for setting a target rolling magnitude and generating reference data representative of said target rolling magnitude; means for comparing said vehicular rolling representative data and said reference data for deriving difference data representative of a difference therebetween; and a controlling means, responsive to said difference data, for deriving first and second control signals which have opposite polarity to each other, for controlling said first and second valve means for reducing the difference between said vehicular rolling representative data and said reference data to zero. - View Dependent Claims (7, 8, 9, 10)
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11. An anti-pitching control system for a vehicular height regulation system comprising:
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a first fluid actuator provided in a first suspension system disposed between a first side of a vehicular body and a first road wheel, said first actuator being variable of fluid pressure for adjusting relative distance between said first side of the vehicular body and said first road wheel; a second fluid actuator provided in a second suspension system disposed between a second side of the vehicular body transversely oriented opposite to said first side and a second road wheel, said second fluid actuator being variable of fluid pressure for adjusting relative distance between said second side of the vehicular body and said second road wheel; a fluid pressure source circuit connected to said first and second actuators, said fluid pressure source circuit incorporating a first valve means for adjusting fluid pressure in said first fluid actuator and a second valve means for adjusting fluid pressure in said second fluid actuator; a sensor means for monitoring a preselected parameter affected by vehicular attitude and variable depending upon magnitude and direction of vehicular body pitching for producing a pitching representative signal; means for processing said pitching representative signal for deriving vehicular pitching representative data; a target pitching magnitude setting means for setting a target pitching magnitude and generating reference data representative of said target pitching magnitude; means for comparing said vehicular pitching representative data and said reference data for deriving difference data representative of a difference therebetween; and a controlling means, responsive to said difference data, for deriving first and second control signals which have opposite polarity to each other, for controlling said first and second valve means for reducing the difference between said vehicular pitching representative data and said reference data to zero. - View Dependent Claims (12, 13, 14, 15)
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16. An attitude change suppressive vehicular height regulation system comprising:
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a first actuator disposed in a first suspension system provided between a front portion of a vehicular body and a first road wheel, said first actuator being variable of fluid pressure so as to adjust a relative distance between said vehicular body and said first road wheel; a second actuator disposed in a second suspension system provided between the front portion of the vehicular body and a second road wheel, said second actuator being variable of fluid pressure so as to adjust a relative distance between said vehicular body and said second road wheel; a third actuator disposed in a third suspension system provided between a rear portion of a vehicular body at a transverse side to said first actuator and a third road wheel, said third actuator being variable of fluid pressure so as to adjust a relative distance between said vehicular body and said third road wheel; a fourth actuator disposed in a fourth suspension system provided between the rear portion of the vehicular body at the same transverse side to said second actuator and a fourth road wheel, said fourth actuator being variable of fluid pressure so as to adjust a relative distance between said vehicular body and said fourth road wheel; an anti-pitching control means monitoring a magnitude of vehicular pitching, comparing the monitored pitching magnitude with a target pitching magnitude for producing pitching control signals for adjusting fluid pressure in respective ones of said first, second, third and fourth actuators so as to reduce to zero a difference between the monitored pitching magnitude and said target pitching magnitude, wherein pitching control signals for adjusting fluid pressures of said first and second actuators have opposite polarity to that of pitching control signals for adjusting fluid pressure of said third and fourth actuators; an anti-rolling control means monitoring a magnitude of vehicular rolling, comparing the monitored rolling magnitude with a target rolling magnitude for producing rolling control signals for adjusting fluid pressure in respective ones of said first, second, third and fourth actuators for reducing to zero a difference between the monitored rolling magnitude and said target rolling magnitude, wherein rolling control signals for adjusting fluid pressures of said first and third actuators have opposite polarity to that of rolling control signals for adjusting fluid pressure of said second and fourth actuators; and a lifting control means monitoring a lifting magnitude at respective ones of said first, second, third and fourth suspension systems, comparing the monitored lifting magnitude at each of said first, second, third and fourth suspension systems with a target lifting magnitude and obtaining a difference therebetween, and deriving a lifting control signal on the basis of said difference so that said difference at each of said suspension systems is reduced to zero. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification