Electrically powered suspension system

Patent metadata

Field	Value
Publication number	US-11376915-B2
Application number	US-202016830477-A
Country	US
Kind code	B2
Filing date	Mar 26, 2020
Priority date	Mar 27, 2019
Publication date	Jul 5, 2022
Grant date	Jul 5, 2022

Abstract

Included are an electromagnetic actuator which generates a drive force for damping vibration of a vehicle body; an information acquirer which acquires time-series information about a stroke position of, and information about a stroke velocity of, the electromagnetic actuator, as well as information about reverse of a stroke direction and information about a stroke amount after the reverse; a damping force calculator which calculates a target damping force based on the information about the stroke velocity; and a drive controller which controls drive of the electromagnetic actuator using a target drive force based on the target damping force calculated by the damping force calculator. The damping force calculator corrects the target drive force based on the information about the stroke amount after the reverse acquired by the information acquirer.

First claim

What is claimed is:

1. An electrically powered suspension system comprising:
an electromagnetic actuator which is provided between a vehicle body and a wheel of a vehicle, and which generates a drive force for damping vibration of the vehicle;
an information acquirer which acquires time-series information about a stroke position of, and information about a stroke velocity of, the electromagnetic actuator, as well as information about reverse of a stroke direction and information about a stroke amount after the reverse, based on the time-series information about the stroke position;
a damping force calculator which calculates a target damping force serving as a target value of the damping operation of the electromagnetic actuator based on the information about the stroke velocity acquired by the information acquirer; and
a drive controller which controls drive of the electromagnetic actuator using a target drive force based on the target damping force calculated by the damping force calculator, wherein
the damping force calculator corrects the target damping force based on the information about the stroke amount after the reverse acquired by the information acquirer.

2. An electrically powered suspension system comprising:
an electromagnetic actuator which is provided between a vehicle body and a wheel of a vehicle, and which generates a drive force for damping vibration of the vehicle;
an information acquirer which acquires time-series information about a stroke position of, and information about a stroke velocity of, the electromagnetic actuator, as well as information about reverse of a stroke direction and information about a stroke amount after the reverse, based on the time-series information about the stroke position;
a damping force calculator which calculates a target damping force serving as a target value of the damping operation of the electromagnetic actuator based on the information about the stroke velocity acquired by the information acquirer; and
a drive controller which controls drive of the electromagnetic actuator using a target drive force based on the target damping force calculated by the damping force calculator, wherein
the damping force calculator corrects the target damping force based on the information about the stroke amount after the reverse acquired by the information acquirer, such that as the stroke amount becomes smaller, the target damping force becomes weaker.

3. The electrically powered suspension system according to claim 1 , wherein
the damping force calculator calculates the target damping force by: calculating a reference damping force serving as a reference of the electromagnetic actuator based on the information about the stroke velocity acquired by the information acquirer; calculating a correction ratio for correcting the reference damping force based on the information about the stroke amount after the reverse acquired by the information acquirer; and multiplying the calculated reference damping force by the correction ratio.

4. The electrically powered suspension system according to claim 3 , wherein
the damping force calculator performs a correction to adjust a value of the correction ratio based on the information about the stroke velocity acquired by the information acquirer.

5. The electrically powered suspension system according to claim 3 , wherein
the information acquirer acquires information about a vehicle speed, and
the damping force calculator performs the correction to adjust the value of the correction ratio based on the information about the vehicle speed acquired by the information acquirer.

6. The electrically powered suspension system according to claim 3 , wherein
the information acquirer acquires information about steering, and
the drive controller performs the correction to adjust the value of the correction ratio based on a steering amount based on the information about the steering acquired by the information acquirer.

7. The electrically powered suspension system according to claim 3 , wherein
the information acquirer acquires road surface information about a road surface on which a host vehicle is running, and
the drive controller performs the correction to adjust the value of the correction ratio based on the road surface information about the host vehicle acquired by the information acquirer.

Assignees

• Honda Motor Co Ltd

Inventors

• Ohno Satoshi
• Yoneda Atsuhiko

Classifications

• B60G17/0157 Primary

  non-fluid unit, e.g. electric motor · CPC title

• B60G2202/42

  Electric actuator · CPC title

• B60G17/018

  characterised by the use of a specific signal treatment or control method · CPC title

• B60G2600/182

  Active control means · CPC title

• B60G2400/102

  vertical · CPC title