Electric damper
First Claim
1. An electric damper comprising:
- a conversion unit that converts a vertical motion of a wheel into a rotation of an electric motor;
a wheel vertical motion detector that detects a vertical motion of the wheel; and
a damping unit that controls the electric motor based on a signal from the wheel vertical motion detector to change damping force to damp vibration of a vertical motion of the wheel in a predetermined frequency band between a first predetermined frequency and a second predetermined frequency greater than the first predetermined frequency, whereinthe damping unit sets, in accordance with a vehicle speed, the predetermined frequency band in which the damping force is changed.
1 Assignment
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Accused Products
Abstract
An electric damper which does not transmit unbalance wheel vibration to a vehicle body is provided. A low-pass cutoff frequency setting unit and a high-pass cutoff frequency setting unit respectively set the cutoff frequencies for band-stop filters to a frequency band corresponding to unbalance wheel vibration based on a signal indicating a vehicle speed from a vehicle speed sensor, and a function as a band-stop filter comprising a low-pass filter computation unit, a high-pass filter computation unit and an adder is computed for a displacement rate of the vertical motion of a wheel calculated by a differentiating unit in a damper control unit. A damper control amount computation unit calculates a control amount of controlling an electric motor for a motor-driven damper based on the calculated filtered displacement rate, and outputs a control signal to a motor driving unit through a driving circuit output unit.
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Citations
5 Claims
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1. An electric damper comprising:
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a conversion unit that converts a vertical motion of a wheel into a rotation of an electric motor; a wheel vertical motion detector that detects a vertical motion of the wheel; and a damping unit that controls the electric motor based on a signal from the wheel vertical motion detector to change damping force to damp vibration of a vertical motion of the wheel in a predetermined frequency band between a first predetermined frequency and a second predetermined frequency greater than the first predetermined frequency, wherein the damping unit sets, in accordance with a vehicle speed, the predetermined frequency band in which the damping force is changed. - View Dependent Claims (2, 3, 4, 5)
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Specification