Attitude change suppression control system for active suspension system with high sensitivity of vehicular attitude change
First Claim
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1. An active suspension system comprising:
- suspension systems, each being disposed between a vehicular body and a road wheel, each of said suspension systems including a variable pressure working chamber for generating a damping force acting against relative displacement between the vehicular body and the road wheel;
a hydraulic system connected to said working chambers for adjusting fluid pressure therein, said hydraulic system including pressure control valves for respectively controlling introduction and draining of pressurized fluid to said working chambers for adjusting the fluid pressure in said working chambers;
first sensors for monitoring a vertical displacement of the vehicular body at mutually different positions of the vehicular body for producing first sensor signals respectively representative of the vertical displacement of the vehicular body at the different positions; and
control means responsive to the first sensor signals from said first sensors to determine a vehicular attitude variation, said control means outputting control signals based on the vehicular attitude variation to the pressure control valves respectively to provide control pressure in the working chambers of said suspension systems for thereby suppressing the vehicular attitude variation.
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Abstract
An active suspension system includes vertical acceleration sensors provided at positions where suspension systems associated with respective vehicular wheels are provided. A control unit receives vertical acceleration data of the respective suspension systems for processing the received data for deriving control command values representative of required damping magnitudes at the respective suspension systems. For this, the control unit derives angular velocity of vehicular attitude change. The control command value is thus derived on the basis of the vehicular attitude change and angular velocity.
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Citations
35 Claims
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1. An active suspension system comprising:
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suspension systems, each being disposed between a vehicular body and a road wheel, each of said suspension systems including a variable pressure working chamber for generating a damping force acting against relative displacement between the vehicular body and the road wheel; a hydraulic system connected to said working chambers for adjusting fluid pressure therein, said hydraulic system including pressure control valves for respectively controlling introduction and draining of pressurized fluid to said working chambers for adjusting the fluid pressure in said working chambers; first sensors for monitoring a vertical displacement of the vehicular body at mutually different positions of the vehicular body for producing first sensor signals respectively representative of the vertical displacement of the vehicular body at the different positions; and control means responsive to the first sensor signals from said first sensors to determine a vehicular attitude variation, said control means outputting control signals based on the vehicular attitude variation to the pressure control valves respectively to provide control pressure in the working chambers of said suspension systems for thereby suppressing the vehicular attitude variation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A rolling suppressive active suspension system comprising:
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suspension systems each being disposed between a vehicular body and a road wheel, each of said suspension systems including a variable pressure working chamber for generating a damping force acting against relative displacement between the vehicular body and the road wheel; a hydraulic system connected to said working chambers for adjusting fluid pressure therein, said hydraulic system including a pressure control valves for respectively controlling introduction and draining of pressurized fluid to said working chambers for adjusting the fluid pressure in said working chambers; first sensors for monitoring vertical displacement of the vehicular body at mutually different positions of the vehicular body for producing first sensor signals respectively representative of the vertical displacement of the vehicular body at the different positions; and control means responsive to the first sensor signals from said first sensors to determine vehicular rolling, said control means outputting control signals based on the vehicular rolling to the pressure control valves respectively to provide control pressure in the working chambers of said suspension systems for thereby suppressing the vehicular rolling. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A pitching suppressive active suspension system comprising:
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suspension systems, each being disposed between a vehicular body and a road wheel, each of said suspension systems including a variable pressure working chamber for generating a damping force acting against relative displacement between the vehicular body and the road wheel; a hydraulic system connected to said working chambers for adjusting fluid pressure therein, said hydraulic system including pressure control valves for respectively controlling introduction and draining of pressurized fluid to aid working chambers for adjusting the fluid pressure in said working chambers; first sensors for monitoring vertical displacement of the vehicular body at mutually different positions of the vehicular body for producing first sensor signals respectively representative of the vertical displacement of the vehicular body at the different positions; and control means responsive to the first sensor signals to determine a vehicular pitching, said control means outputting control signals based on the vehicular pitching to the pressure control valves respectively to provide control for thereby suppressing the vehicular pitching. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. An active suspension system for a vehicle comprising:
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suspension systems disposed between a vehicle body and suspension members which respectively support vehicle wheels rotatably, each of said suspension systems including a fluid cylinder adjustable of cylinder pressure for active suspension control; first sensors respectively detecting vertical accelerations acting on different portions of the vehicle body to provide first sensor signals indicative thereof; a second sensor detecting acceleration acting on the horizontal plane of the vehicle body to provide a second sensor signal indicative thereof; a power source unit which supplied pressurized fluid to the fluid cylinder; pressure control valves for adjusting pressure of the fluid supplied from said power source unit to the fluid cylinders; and control means responsive to the first sensor signals to determine a first vehicle attitude change caused by vertical acceleration and also responsive to the second sensor signal to determine a second vehicle attitude change caused by acceleration in the horizontal plane of the vehicle body to provide first and second control signals to said pressure control valves respectively for providing control pressures in the fluid cylinders for suppressing the first and second vehicle attitude changes. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification