System for vehicle body roll control detecting and compensating for rapid rate of change of steering angle as during emergency steering
First Claim
1. For a vehicle comprising a body and a plurality of wheels upon which said vehicle runs, a vehicle roll control system of vehicle height adjustment type, comprising:
- a plurality of actuator assemblies each corresponding to one of said vehicle wheels and resiliently suspending said corresponding vehicle wheel from the vehicle body, each one of said actuator assemblies being adapted to increase or decrease vehicle height at a location corresponding to said corresponding vehicle wheel in accordance with signals supplied thereto;
a plurality of control means, each corresponding to one of said actuator assemblies and serving to supply said control signals to said corresponding actuator assembly;
a vehicle speed detecting means for sensing a road speed of the vehicle;
a steering angle detecting means for sensing a steering angle of the vehicle;
a steering angle change rate detecting means for detecting the rate of change of said steering angle of the vehicle;
a means for detecting an actual roll angle φ
t of the body of the vehicle; and
a means for computing and control adapted to compute a steady state roll angle φ
.sub.∞
of the vehicle body based upon the vehicle speed sensed by said vehicle speed detecting means and the steering angle sensed by said steering angle detecting means;
to advance a phase of a signal representative of said steady state roll angle φ
.sub.∞
to thereby compute a compensating value φ
.sub.∞
for roll angle control;
to compute an amendment value φ
x for roll angle control in accordance with the rate of change of steering angle as determined by said steering angle change rate detecting means;
to compute a difference φ
based upon a desired roll angle φ
a of said vehicle body, said compensating value φ
.sub.∞
, said amendment value φ
x, and said actual roll angle φ
t following the equation;
space="preserve" listing-type="equation">φ
=φ
.sub.a -(k1φ
.sub.∞
+k2φ
.sub.t +k3φ
.sub.x)where k1, k2 and k3 are positive constants; and
to control said plurality of actuator assemblies, via said plurality of control means, in accordance with said differences φ
, when the absolute value of said difference φ
is larger than a predetermined value.
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Accused Products
Abstract
In this system for vehicle roll control, one actuator assembly is provided corresponding to each vehicle wheel and resiliently suspends it from the vehicle body. Each of these actuator assemblies is adapted to increase or decrease the vehicle height at its vehicle wheel as a result of a control signal being supplied. Control means are provided corresponding to the actuator assemblies and serve to supply control signals to them. A vehicle speed detecting means senses road speed, a steering angle detecting means senses steering angle, a means senses the rate of change of steering angle, and a means detects the actual roll angle φt of the vehicle body. A computing and control means computes a steady state roll angle φ.sub.∞ of the vehicle body from the vehicle speed and the steering angle, advances the phase of a signal representative of the steady state roll angle φ.sub.∞ to thereby compute a compensating value Φ.sub.∞ of roll angle, computes an amendment value φx of roll angle in accordance with the rate of change of steering angle, computes the difference φ based upon the desired roll angle φa of the vehicle body, the compensating value Φ.sub.∞, the amendment value φx, and the actual roll angle φt following the equation: φ=φa- (k1 Φ.sub.∞ +k2 Φt+k3 Φx), where k1, k2 and k3 are positive constants; and controls the actuator assemblies, via the control means, in accordance with the difference φ, when the absolute value of the difference φ is larger than a predetermined value.
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Citations
14 Claims
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1. For a vehicle comprising a body and a plurality of wheels upon which said vehicle runs, a vehicle roll control system of vehicle height adjustment type, comprising:
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a plurality of actuator assemblies each corresponding to one of said vehicle wheels and resiliently suspending said corresponding vehicle wheel from the vehicle body, each one of said actuator assemblies being adapted to increase or decrease vehicle height at a location corresponding to said corresponding vehicle wheel in accordance with signals supplied thereto; a plurality of control means, each corresponding to one of said actuator assemblies and serving to supply said control signals to said corresponding actuator assembly; a vehicle speed detecting means for sensing a road speed of the vehicle; a steering angle detecting means for sensing a steering angle of the vehicle; a steering angle change rate detecting means for detecting the rate of change of said steering angle of the vehicle; a means for detecting an actual roll angle φ
t of the body of the vehicle; anda means for computing and control adapted to compute a steady state roll angle φ
.sub.∞
of the vehicle body based upon the vehicle speed sensed by said vehicle speed detecting means and the steering angle sensed by said steering angle detecting means;
to advance a phase of a signal representative of said steady state roll angle φ
.sub.∞
to thereby compute a compensating value φ
.sub.∞
for roll angle control;
to compute an amendment value φ
x for roll angle control in accordance with the rate of change of steering angle as determined by said steering angle change rate detecting means;
to compute a difference φ
based upon a desired roll angle φ
a of said vehicle body, said compensating value φ
.sub.∞
, said amendment value φ
x, and said actual roll angle φ
t following the equation;
space="preserve" listing-type="equation">φ
=φ
.sub.a -(k1φ
.sub.∞
+k2φ
.sub.t +k3φ
.sub.x)where k1, k2 and k3 are positive constants; and
to control said plurality of actuator assemblies, via said plurality of control means, in accordance with said differences φ
, when the absolute value of said difference φ
is larger than a predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. For a vehicle comprising a body and a plurality of wheels upon which said vehicle runs, a vehicle roll control system of vehicle height adjustment type, comprising:
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a plurality of actuator assemblies, each corresponding to one of said vehicle wheels and resiliently suspending said corresponding vehicle wheel from the vehicle body, each one of said actuator assemblies being adapted to increase or decrease vehicle height at a location corresponding to said corresponding vehicle wheel in accordance with control signals supplied thereto; a plurality of control means, each corresponding to one of said actuator assemblies and serving to supply control signals to said corresponding actuator assembly; a plurality of vehicle height detecting means, each corresponding to one of said vehicle wheels and serving for sensing a parameter Hi representative of the height of the vehicle body over said corresponding vehicle wheel; a vehicle speed detecting means for sensing a road speed of the vehicle; a steering angle detecting means for sensing a steering angle of the vehicle; a steering angle change rate detecting means for detecting the rate of change of said steering angle of the vehicle; a means for detecting an actual roll angle φ
t of the body of the vehicle; anda means for computing and control adapted to compute the differences Δ
Hi between the actual vehicle wheel heights over said vehicle wheels as sensed by said plurality of vehicle height detecting means and reference vehicle heights;
to compute a steady state roll angle φ
.sub.∞
of the vehicle body based upon the vehicle speed sensed by said vehicle speed detecting means and the steering angle sensed by said steering angle detecting means;
to advance a phase of a signal representative of said steady state roll angle φ
.sub.∞
to thereby compute a compensating value φ
.sub.∞
for roll angle control;
to compute an amendment value φ
x for roll angle control in accordance with the rate of change of steering angle as determined by said steering angle change rate detecting means;
to compute a difference φ
based upon a desired roll angle φ
a of said vehicle body, said compensating value φ
.sub.∞
, said amendment value φ
x, and said actual roll angle φ
t following the equation;
space="preserve" listing-type="equation">φ
=φ
.sub.a -(k1φ
.sub.∞
+k2φ
.sub.t +k3φ
.sub.x)where k1, k2 and k3 are positive constants; and
, when the absolute value of said difference φ
is larger than a predetermined value, to control said plurality of actuator assemblies, via said plurality of control means, in accordance with said difference φ
;
while said computing and control means, when the absolute value of said difference φ
is less than said predetermined value, controls said plurality of actuator assemblies, via said plurality of control means, in accordance with said vehicle height differences Δ
Hi, so as to keep said vehicle height differences Δ
Hi within determinate ranges. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification