Actively controlled automotive suspension system with adjustable rolling-stability and/or pitching-stability
First Claim
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1. An actively controlled suspension system for an automotive vehicle comprising:
- first pressure means disposed between a first lateral side of a vehicle body and a first suspension member supporting first front and rear road wheels, said first pressure means including a variable pressure chamber varying pressure of a working fluid therein for adjusting relative displacement between the vehicle body and the first suspension member;
second pressure means disposed between a second lateral side of the vehicle body opposite the first lateral side and a second suspension member supporting second front and rear wheels, said second pressure means including a variable pressure chamber varying pressure of a working fluid therein for adjusting relative displacement between the vehicle body and the second suspension member;
lateral acceleration determining means including a vehicle speed sensor which monitors vehicle speed V to provide a signal indicative thereof and a steering angle sensor which monitors a steered angle of a steering wheel to determine an actual steered angel δ
of the road wheels and provides a signal indicative thereof, said lateral acceleration determining means projecting a lateral acceleration G, which causes rolling motion of the vehicle body, according to the following relation and providing a lateral acceleration indicative signal, ##EQU2## wherein, V is vehicle speed,l is wheel base length,k s is a stability factor,S is a Laplace operator,
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Abstract
An actively controlled suspension system includes a vehicular rolling detecting component to adjust the suspension characteristics for suppressing the vehicular rolling. In addition, the actively controlled suspension control system may be provided for adjusting roll-stabilization load distribution between the front and rear suspension systems for adjusting vehicular driving stability by suppressing rolling and pitching of the vehicle body.
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Citations
15 Claims
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1. An actively controlled suspension system for an automotive vehicle comprising:
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first pressure means disposed between a first lateral side of a vehicle body and a first suspension member supporting first front and rear road wheels, said first pressure means including a variable pressure chamber varying pressure of a working fluid therein for adjusting relative displacement between the vehicle body and the first suspension member; second pressure means disposed between a second lateral side of the vehicle body opposite the first lateral side and a second suspension member supporting second front and rear wheels, said second pressure means including a variable pressure chamber varying pressure of a working fluid therein for adjusting relative displacement between the vehicle body and the second suspension member; lateral acceleration determining means including a vehicle speed sensor which monitors vehicle speed V to provide a signal indicative thereof and a steering angle sensor which monitors a steered angle of a steering wheel to determine an actual steered angel δ
of the road wheels and provides a signal indicative thereof, said lateral acceleration determining means projecting a lateral acceleration G, which causes rolling motion of the vehicle body, according to the following relation and providing a lateral acceleration indicative signal, ##EQU2## wherein, V is vehicle speed,l is wheel base length, k s is a stability factor, S is a Laplace operator,
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2. ζ
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2 are damping ratios, andω
1, ω
2 are natural frequencies; anda controller responsive to the acceleration indicating signal from said lateral acceleration determining means to amplify it with a preselected gain to provide first and second control signals, each control signal having a preselected signal level which includes a polarity opposite that of the other control signal, said controller outputting the first and second control signals to said first and second pressure means to increase and decrease the pressure of the working fluid in the variable pressure chambers respectively for suppressing rolling motion of the vehicle body. - View Dependent Claims (4, 6)
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1. ζ
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3. An actively controlled suspension system for an automotive vehicle comprising:
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front pressure means including, a first actuator which is provided at a front portion of a first lateral side of a vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated front road wheel, said first actuator having a first variable pressure chamber and, a second actuator provided at a front portion of a second lateral side of the vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated front road wheel, said second actuator having a second variable pressure chamber; rear pressure means including a third actuator which is provided at a rear portion of the first lateral side of the vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated rear road wheel, said third actuator having a third variable pressure chamber and a fourth actuator provided at a rear portion of the second lateral side of the vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated rear road wheel, the fourth actuator having a fourth variable pressure chamber; a steering angle sensor which monitors angular acceleration of steering of a steering angle to determine initial and final stages of steering operation during cornering to provide a signal indicative thereof; lateral acceleration determining means for determining lateral acceleration acting on the vehicle body to cause rolling motion of the vehicle body and providing a signal indicative thereof; a control unit responsive to the signal from said lateral acceleration determining means to amplify said signal with first and second preselected gains to provide first and second control signals to said front and rear pressure means respectively to adjust pressure in the first, second, third, and fourth variable pressure chambers to suppress rolling motion; and a gain controller which changes a gain ratio from first to second preselected gains according to the signal from said steering angle sensor. - View Dependent Claims (5, 7, 8, 10)
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9. An actively controlled suspension system for an automotive vehicle comprising:
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front pressure means including, a first actuator which is provided at a front portion of a first lateral side of a vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated front road wheel, said first actuator having a first variable pressure chamber and, a second actuator which is provided at a front portion of a second lateral side of the vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated front road wheel, said second actuator having a second variable pressure chamber; rear pressure means including, a third actuator which is provided at a rear portion of the first lateral side of the vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated rear road wheel, the third actuator having a third variable pressure chamber and, a fourth actuator provided at a rear portion of the second lateral side of the vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated rear road wheel, the fourth actuator having a fourth variable pressure chamber; lateral acceleration determining means for determining lateral acceleration, which acts on the vehicle body to cause rolling motion of the vehicle body, and providing a signal indicative thereof; a control unit responsive to the signal from said lateral acceleration determining means to amplify said signal with first and second gains to provide first and second control signals to said front and rear pressure means respectively to adjust pressure in the first, second, third, and fourth variable pressure chambers to suppress rolling motion; and a gain selector which manually changes a gain ratio of the first to second preselected gains. - View Dependent Claims (11, 13, 15)
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12. An actively controlled suspension system for an automotive vehicle comprising:
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front pressure means including, a first actuator which is provided at a front portion of a first lateral side of a vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated front road wheel, the first actuator having a first variable pressure chamber and, a second actuator which is provided at a front portion of a second lateral side of the vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated front road wheel, the second actuator having a second variable pressure chamber; rear pressure means including, a third actuator which is provided at a rear portion of the first lateral side of the vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated rear road wheel, the third actuator having a third variable pressure chamber and, a fourth actuator provided at a rear portion of the second lateral side of the vehicle body, interposed between the vehicle body and a suspension member rotatably supporting an associated rear road wheel, the fourth actuator having a fourth variable pressure chamber; lateral acceleration determining means for determining lateral acceleration, which acts on the vehicle body to cause rolling motion of the vehicle body, and providing a signal indicative thereof; a control unit responsive to the signal from said lateral acceleration determining means to amplify said signal with first and second gains to provide first and second control signals to said front and rear pressure means respectively to adjust pressure in the first, second, third, and fourth variable pressure chambers to suppress rolling motion of the vehicle body; and a total gain setting means for setting a total gain of the first and second gains, said total gain setting means including a manual selector which manually selects a magnitude of the total gain.
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14. An actively controlled suspension system for an automotive vehicle comprising:
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front pressure means disposed between a front portion of a vehicle body and a front suspension member supporting a front road wheel, said front pressure means including a variable pressure chamber varying pressure of a working fluid therein for adjusting relative displacement between the vehicle body and the front suspension member; rear pressure means disposed between a rear portion of the vehicle body and a rear suspension member supporting a rear road wheel, said rear pressure means including a variable pressure chamber varying pressure of a working fluid therein for adjusting relative displacement between the vehicle body and the rear suspension member; longitudinal acceleration determining means which determines longitudinal acceleration acting on the vehicle body to cause pitching motion of the vehicle body and providing a signal indicative thereof; a controller responsive to the signal from said longitudinal acceleration determining means to amplify it with a preselected gain to provide first and second control signals to said front and rear pressure chambers respectively to adjust the pressure of the working fluid in the variable pressure chambers to suppress the pitching motion of the vehicle body; and a gain selector which manually changes magnitude of said gain.
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Specification