Adjustable hydropneumatic active suspension apparatus
First Claim
1. An active suspension apparatus using hydropneumatic springs for suspending a body of a vehicle on wheels by utilizing fluid and air pressures, comprising:
- acceleration detecting means, located at the floor of a passenger compartment, of a vehicle, for detecting an absolute acceleration Z of said floor corresponding to a vertical acceleration of the floor;
displacement detecting means for detecting a relative displacement X between an axle of the vehicle and the body;
a controller having a differentiator for differentiating the relative displacement X detected by said displacement detecting means and generating a rate X of change in relative displacement as a function of time, an absolute value circuit for calculating absolute values of the absolute acceleration Z, the relative displacement X and the rate X of change in relative displacement X, an operation circuit for multiplying the absolute values |Z|, |X| and |X| from said absolute value circuit with predetermined coefficients, respectively, and producing an output signal from the sum of the absolute values which have been multiplied by the coefficients, and a comparator for comparing an output signal from said operation circuit with a reference value and generating a signal representing the state of the road surface on which the vehicle travels and the travel state of the vehicle; and
driving means for controlling an opening of a restrictor arranged between each hydropneumatic spring chamber and a corresponding actuator in accordance with the signal from said controller,whereby damping force characteristics are controlled in accordance with the road surface state and the travel state.
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Accused Products
Abstract
An active suspension apparatus detects an absolute acceleration Z in a passenger'"'"'s compartment of a vehicle and a relative displacement X between an axle and a body, calculates an absolute value |Z| of the absolute acceleration, an absolute value |X| of the relative displacement and an absolute value |X| of a rate X of change in relative displacement, multiplies the absolute values |X|, |X|, and |Z| with coefficients A11, A12 and A13, and adding the resultant product to obtain a sum Y=A11|X|+A12|X|+A13|Z.vertline., compares the sum Y with a reference value C for evaluating the predetermined movement of the vehicle, and controls the damping forces of the hydropneumatic springs, thereby improving steering stability and riding comfort.
50 Citations
9 Claims
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1. An active suspension apparatus using hydropneumatic springs for suspending a body of a vehicle on wheels by utilizing fluid and air pressures, comprising:
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acceleration detecting means, located at the floor of a passenger compartment, of a vehicle, for detecting an absolute acceleration Z of said floor corresponding to a vertical acceleration of the floor; displacement detecting means for detecting a relative displacement X between an axle of the vehicle and the body; a controller having a differentiator for differentiating the relative displacement X detected by said displacement detecting means and generating a rate X of change in relative displacement as a function of time, an absolute value circuit for calculating absolute values of the absolute acceleration Z, the relative displacement X and the rate X of change in relative displacement X, an operation circuit for multiplying the absolute values |Z|, |X| and |X| from said absolute value circuit with predetermined coefficients, respectively, and producing an output signal from the sum of the absolute values which have been multiplied by the coefficients, and a comparator for comparing an output signal from said operation circuit with a reference value and generating a signal representing the state of the road surface on which the vehicle travels and the travel state of the vehicle; and driving means for controlling an opening of a restrictor arranged between each hydropneumatic spring chamber and a corresponding actuator in accordance with the signal from said controller, whereby damping force characteristics are controlled in accordance with the road surface state and the travel state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification