SUSPENSION DEVICE
1 Assignment
0 Petitions
Accused Products
Abstract
A suspension apparatus 1 includes an electric shock absorber 30 having a motor 40 and a ball screw mechanism 35, an electric circuit 101, an inverting amplification circuit 120, and an inertia compensation capacitor Cp. The electric circuit 101 electrically connects the two electricity supply terminals of the motor 40. The inverting amplification circuit 120 is connected to the electric circuit 101. The inertia compensation capacitor Cp is connected to the output terminal O of the inverting amplification circuit 120. As a result of approaching or separating motion between sprung and unsprung members, not only a generated current but also an inertia corresponding current Im which represents an inertial force of a rotation body, such as the ball screw shaft 36 and the rotor of the motor 40, flows through the motor 40 and the electric circuit 101. A current Ip which is antiphase to the inertia corresponding current Im flows through the inertia compensation capacitor Cp. This antiphase current Ip cancels out the inertia corresponding current Im.
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Citations
17 Claims
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1-9. -9. (canceled)
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10. A suspension apparatus for a vehicle, comprising:
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a shock absorber which includes a motor having a stator coupled with one of sprung and unsprung members of the vehicle and a rotor rotatable in relation to the stator, wherein, due to an inductive electromotive force generated when the rotor is rotated as a result of approaching and separating motions between the sprung and unsprung members, an induction current flows through the motor, whereby a damping force is generated; an electric circuit which establishes electrical connection between two electricity supply terminals of the motor; and an electrical characteristic adjustment part which adjusts an electrical characteristic of the electric circuit so as to reduce an inertia corresponding current which is a current flowing through the motor and which represents an inertial force of a rotation body which includes at least the rotor and which rotates as a result of the approaching and separating motions between the sprung and unsprung members, wherein the electrical characteristic adjustment part comprises; an inverting amplification circuit which includes an operational amplifier, an input resistor, and a feedback resistor, the operation amplifier having a non-inverting input terminal connected to one electricity supply terminal of the motor, an inverting input terminal connected to the other electricity supply terminal of the motor, and an output terminal; and an inertia compensation capacitor connected to the output terminal. - View Dependent Claims (11)
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12. A suspension apparatus for a vehicle, comprising:
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a shock absorber which includes a motor having a stator coupled with one of sprung and unsprung members of the vehicle and a rotor rotatable in relation to the stator, wherein, due to an inductive electromotive force generated when the rotor is rotated as a result of approaching and separating motions between the sprung and unsprung members, an induction current flows through the motor, whereby a damping force is generated; an electric circuit which establishes electrical connection between two electricity supply terminals of the motor; and an electrical characteristic adjustment part which adjusts an electrical characteristic of the electric circuit so as to reduce an inertia corresponding current which is a current flowing through the motor and which represents an inertial force of a rotation body which includes at least the rotor and which rotates as a result of the approaching and separating motions between the sprung and unsprung members, wherein the electrical characteristic adjustment part adjusts the electrical characteristic of the electric circuit such that an anti-resonance frequency of a parallel resonant circuit formed by the electric circuit and an inertia corresponding capacitor which is imaginarily connected in parallel to the electric circuit and which has a capacitance corresponding to the inertial force of the rotation body coincides with a predetermined frequency equal to or close to an unsprung resonance frequency. - View Dependent Claims (13)
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14. A suspension apparatus for a vehicle, comprising:
- a shock absorber which includes a motor having a stator coupled with one of sprung and unsprung members of the vehicle and a rotor rotatable in relation to the stator, wherein, due to an inductive electromotive force generated when the rotor is rotated as a result of approaching and separating motions between the sprung and unsprung members, an induction current flows through the motor, whereby a damping force is generated;
an electric circuit which establishes electrical connection between two electricity supply terminals of the motor; and an electrical characteristic adjustment part which adjusts an electrical characteristic of the electric circuit so as to reduce an inertia corresponding current which is a current flowing through the motor and which represents an inertial force of a rotation body which includes at least the rotor and which rotates as a result of the approaching and separating motions between the sprung and unsprung members, wherein the electrical characteristic adjustment part comprises; an inertia corresponding current computation section which computes the inertia corresponding current on the basis of the inductive electromotive force and a capacitance corresponding to the inertia of the rotation body; and an inertia compensation current supply apparatus which supplies to the electric circuit an inertia compensation current which is a current antiphase to the computed inertia corresponding current.
- a shock absorber which includes a motor having a stator coupled with one of sprung and unsprung members of the vehicle and a rotor rotatable in relation to the stator, wherein, due to an inductive electromotive force generated when the rotor is rotated as a result of approaching and separating motions between the sprung and unsprung members, an induction current flows through the motor, whereby a damping force is generated;
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15. A suspension apparatus for a vehicle, comprising:
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a shock absorber which includes a motor having a stator coupled with one of sprung and unsprung members of the vehicle and a rotor rotatable in relation to the stator, wherein, due to an inductive electromotive force generated when the rotor is rotated as a result of approaching and separating motions between the sprung and unsprung members, an induction current flows through the motor, whereby a damping force is generated; an electric circuit which establishes electrical connection between two electricity supply terminals of the motor; an electrical characteristic adjustment part which adjusts an electrical characteristic of the electric circuit so as to reduce an inertia corresponding current which is a current flowing through the motor and which represents an inertial force of a rotation body which includes at least the rotor and which rotates as a result of the approaching and separating motions between the sprung and unsprung members; a first element having a first impedance; a second element having a second impedance; and a connection state changeover device which selectively connects the first element or the second element to the electric circuit, wherein the first impedance is set in advance such that a vibration of the sprung member is suppressed by a damping force generated when the first element is connected to the electric circuit, the second impedance is set in advance such that, when the second element is connected to the electric circuit, the impedance of the electric circuit becomes smaller than an impedance represented by a capacitance corresponding to the inertia of the rotation body, and the electrical characteristic adjustment part controls operation of the connection state changeover device such that the first element is connected to the electric circuit in the case where the inertia corresponding current is smaller than a normal current which is the induction current flowing through the electric circuit when the first element is connected to the electric circuit, and the second element is connected to the electric circuit in the case where the inertia corresponding current is larger than the normal current.
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16. A suspension apparatus for a vehicle, comprising:
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a shock absorber which includes a motor having a stator coupled with one of sprung and unsprung members of the vehicle and a rotor rotatable in relation to the stator, wherein, due to an inductive electromotive force generated when the rotor is rotated as a result of approaching and separating motions between the sprung and unsprung members, an induction current flows through the motor, whereby a damping force is generated; an electric circuit which establishes electrical connection between two electricity supply terminals of the motor; an electrical characteristic adjustment part which adjusts an electrical characteristic of the electric circuit so as to reduce an inertia corresponding current which is a current flowing through the motor and which represents an inertial force of a rotation body which includes at least the rotor and which rotates as a result of the approaching and separating motions between the sprung and unsprung members; a first element having a first impedance; a second element having a second impedance; and a connection state changeover device which selectively connects the first element or the second element to the electric circuit, wherein the first impedance is set in advance such that a vibration of the sprung member is suppressed by a damping force generated when the first element is connected to the electric circuit, the second impedance is an impedance which is required by the electric circuit to operate such that, when the second element is connected to the electric circuit, an anti-resonance frequency of a parallel resonant circuit formed by the electric circuit and an inertia corresponding capacitor which is imaginarily connected in parallel to the electric circuit and which has a capacitance corresponding to the inertia of the rotation body coincides with a predetermined frequency equal to or close to an unsprung resonance frequency, and the electrical characteristic adjustment part controls operation of the connection state changeover device such that the first element is connected to the electric circuit in the case where the inertia corresponding current is smaller than a normal current which is the induction current flowing through the electric circuit when the first element is connected to the electric circuit, and the second element is connected to the electric circuit in the case where the inertia corresponding current is larger than the normal current.
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17. A suspension apparatus for a vehicle, comprising:
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a shock absorber which includes a motor having a stator coupled with one of sprung and unsprung members of the vehicle and a rotor rotatable in relation to the stator, wherein, due to an inductive electromotive force generated when the rotor is rotated as a result of approaching and separating motions between the sprung and unsprung members, an induction current flows through the motor, whereby a damping force is generated; an electric circuit which establishes electrical connection between two electricity supply terminals of the motor; an electrical characteristic adjustment part which adjusts an electrical characteristic of the electric circuit so as to reduce an inertia corresponding current which is a current flowing through the motor and which represents an inertial force of a rotation body which includes at least the rotor and which rotates as a result of the approaching and separating motions between the sprung and unsprung members; an external resistor connected to the electric circuit; a switch which can operate to open and close the electric circuit; and duty control means for duty-controlling the switch, wherein the electrical characteristic adjustment part is configured such that, when the inertia corresponding current is smaller than the induction current, the electrical characteristic adjustment part sets the duty ratio of the switch to 100%, and, when the inertia corresponding current is larger than the induction current, the electrical characteristic adjustment part sets the duty ratio of the switch to a predetermined duty ratio such that the damping force generated by the shock absorber becomes equal to or smaller than a predetermined damping force.
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Specification