Vibration damping device for vehicle

Patent metadata

Field	Value
Publication number	US-12420870-B2
Application number	US-202318176720-A
Country	US
Kind code	B2
Filing date	Mar 1, 2023
Priority date	Mar 30, 2022
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

A vibration damping device for a vehicle includes a subframe to which a vibration of a wheel is transmitted, a plurality of mounts arranged between the subframe and a vehicle body and configured such that stiffness of each mount in a prescribed direction changes according to an excitation current supplied thereto, and a controller configured to control the excitation current supplied to each mount, wherein the controller is configured to set a target elastic center of the subframe, and individually calculate the excitation current supplied to each mount so as to match an actual elastic center of the subframe with the target elastic center.

First claim

The invention claimed is:

1. A vibration damping device for a vehicle, comprising:
a subframe to which a vibration of a wheel is transmitted;
a plurality of mounts arranged between the subframe and a vehicle body and configured such that stiffness of each mount in a prescribed direction changes according to an excitation current supplied thereto; and
a controller configured to control the excitation current supplied to each mount,
wherein the controller is configured to:
set a target elastic center of the subframe; and
individually calculate the excitation current supplied to each mount so as to match an actual elastic center of the subframe with the target elastic center.

2. The vibration damping device according to claim 1 , further comprising:
a yaw rate sensor configured to detect a yaw rate of the vehicle body; and
a vehicle speed sensor configured to detect a vehicle speed,
wherein the controller is configured to:
calculate a reference current value based on the yaw rate and the vehicle speed;
calculate a correction coefficient of each mount based on the target elastic center; and
individually calculate the excitation current supplied to each mount by correcting the reference current value based on the correction coefficient of each mount.

3. The vibration damping device according to claim 2 , wherein the plurality of mounts includes a first mount and a second mount that are arranged at an interval in a perpendicular direction perpendicular to the prescribed direction, and
provided that a distance in the perpendicular direction between the target elastic center and the first mount is defined as a first distance and that a distance in the perpendicular direction between the target elastic center and the second mount is defined as a second distance, the controller is configured to:
calculate the correction coefficient of the first mount by dividing the second distance by a sum of the first distance and the second distance; and
calculate the correction coefficient of the second mount by dividing the first distance by the sum of the first distance and the second distance.

4. The vibration damping device according to claim 2 , wherein the controller is configured to:
store a correction coefficient table that defines the correction coefficient of each mount; and
calculate the correction coefficient of each mount by referring to the correction coefficient table.

5. The vibration damping device according to claim 1 , wherein the plurality of mounts is configured such that stiffness of each mount in an up-and-down direction changes according to the excitation current supplied thereto,
the subframe has a vibration input point to which the vibration of the wheel is input, and
the controller is configured to set the target elastic center so as to match a front-and-rear position of the vibration input point with a front-and-rear position of the target elastic center.

6. The vibration damping device according to claim 1 , further comprising a vehicle speed sensor configured to detect a vehicle speed,
wherein the plurality of mounts is configured such that stiffness of each mount in a lateral direction changes according to the excitation current supplied thereto, and
the controller is configured to change the target elastic center in a front-and-rear direction based on the vehicle speed.

Assignees

• Honda Motor Co Ltd

Inventors

• Wang Xun
• Inoue Toshio
• Ito Yuho

Classifications

• F16F15/002

  characterised by the control method or circuitry (control of mechanical oscillations per se G05D19/00) · CPC title

• F16F2230/18

  Control arrangements · CPC title

• F16F2222/06

  Magnetic or electromagnetic · CPC title

• F16F2228/066

  Variable stiffness · CPC title

• B62D21/11 Primary

  with resilient means for suspension {, e.g. of wheels or engine; sub-frames for mounting engine or suspensions} · CPC title