Electric suspension device

Patent metadata

Field	Value
Publication number	US-11433727-B2
Application number	US-202117199799-A
Country	US
Kind code	B2
Filing date	Mar 12, 2021
Priority date	Mar 17, 2020
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

Provided is an electric suspension device including an electromagnetic actuator that is provided between a body and wheel of a vehicle and generates damping force for damping vibration of the body. It includes: an information acquisition unit that acquires information on a sprung speed and sprung acceleration of the vehicle; a bounce target value computation unit that computes a bounce target value for controlling the vehicle's bounce orientation based on the sprung speed; and a driving control unit that controls driving of the actuator with a control target load which is based on the bounce target value. The bounce target value computation unit has a bounce target load map in which the bounce target value is associated with the sprung speed. The bounce target value computation unit adjusts a width of a dead zone set in the map based on the information on the sprung speed and sprung acceleration.

First claim

What is claimed is:

1. An electric suspension including an actuator that is provided between a body and a wheel of a vehicle and generates damping force for damping vibration of the body, the electric suspension device comprising a load control electronic control unit (ECU) configured to:
acquire information on each of a sprung speed and a sprung acceleration of the vehicle;
compute a bounce target value for controlling a bounce orientation of the vehicle based on the sprung speed; and
control driving of the actuator by using a control target load which is based on the bounce target value,
wherein
the load control ECU is configured to have a function in which the bounce target value is associated with the sprung speed,
in the function, a dead zone is set in which a fixed value is associated as the bounce target value with changes in the sprung speed belonging to a predetermined speed range including a direction switch point at which a direction of the sprung speed switches from an extension side to a contraction side or from the contraction side to the extension side,
the load control ECU is configured to adjust a width of the dead zone based on both of the information on the sprung speed and the sprung acceleration,
when a first vibration suppression condition that the sprung speed is a predetermined speed threshold value or less and the sprung acceleration is greater than a predetermined acceleration threshold value is satisfied, the load control ECU is configured to perform an adjustment in which the width of the dead zone is made narrower than the width of the dead zone in a state where the first vibration suppression condition is not satisfied, and to perform computation of the bounce target value by using the function in which the dead zone after the adjustment is set, and
the load control ECU is configured to control the driving of the actuator by using a control target load which is based on the bounce target value obtained by the computation.

2. An electric suspension device including an actuator that is provided between a body and a wheel of a vehicle and generates damping force for damping vibration of the body, the electric suspension device comprising a load control electronic control unit (ECU) configured to:
acquire information on each of a sprung speed and a sprung acceleration of the vehicle;
compute a bounce target value for controlling a bounce orientation of the vehicle based on the sprung speed; and
control driving of the actuator by using a control target load which is based on the bounce target value,
wherein
the load control ECU is configured to have a function in which the bounce target value is associated with the sprung speed,
in the function, a dead zone is set in which a fixed value is associated as the bounce target value with changes in the sprung speed belonging to a predetermined speed range including a direction switch point at which a direction of the sprung speed switches from an extension side to a contraction side or from the contraction side to the extension side,
the load control ECU is configured to adjust a width of the dead zone based on both of the information on the sprung speed and the sprung acceleration,
the load control ECU is further configured to acquire information on each of the direction of the sprung speed of the vehicle and a direction of the sprung acceleration of the vehicle,
when a second vibration suppression condition that the direction of the sprung speed and the direction of the sprung acceleration are same is satisfied, the load control ECU is configured to perform an adjustment in which the width of the dead zone is made narrower than the width of the dead zone in a state where the second vibration suppression condition is not satisfied, and to perform computation of the bounce target value by using the function in which the dead zone after the adjustment is set, and
the load control ECU is configured to control the driving of the actuator by using a control target load which is based on the bounce target value obtained by the computation.

Assignees

• Honda Motor Co Ltd

Inventors

• Goto Yuya
• Kanda Ryoma

Classifications

• B60G2400/102

  vertical · CPC title

• B60G17/015 Primary

  the regulating means comprising electric or electronic elements ({B60G17/002}, B60G17/005 take precedence) · CPC title

• B60G2400/0521

  Roll rate · CPC title

• B60G2400/202

  Piston speed; Relative velocity between vehicle body and wheel · CPC title

• B60G17/0157 Primary

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