Suspension device and recording medium

Patent metadata

Field	Value
Publication number	US-11712940-B2
Application number	US-202016782724-A
Country	US
Kind code	B2
Filing date	Feb 5, 2020
Priority date	Oct 19, 2017
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

A suspension device includes: a suspension including a damping device which damps a force generated between a vehicle body and a wheel; and a damping force control unit that increases a damping force of the damping device so as to be greater than the damping force generated when an acceleration of change in a stroke amount is less than a predetermined value determined in advance, when the acceleration of the change in the stroke amount is equal to or greater than the predetermined value, in which the stroke amount is an amount of displacement from a reference position of the wheel with respect to the vehicle body in an extension direction of the suspension.

First claim

The invention claimed is:

1. A suspension device comprising:
a suspension including a damping device which damps a force generated between a vehicle body and a wheel of a motorcycle;
a damping force control unit that increases a damping force of the damping device such that the damping force generated when an acceleration of a change in a stroke amount is equal to or greater than a predetermined value determined in advance becomes greater than the damping force generated when the acceleration of the change in the stroke amount is less than the predetermined value, the stroke amount being an amount of displacement from a reference position of the wheel with respect to the vehicle body in an extension direction of the suspension; and
a predetermined value setting unit that sets the predetermined value such that the predetermined value is decreased as the stroke amount is decreased, wherein
the damping force is increased in such a manner that the suspension does not go into the most extended state.

2. The suspension device according to claim 1 , wherein
the damping force control unit increases the damping force as the acceleration is increased.

3. A suspension device comprising:
a suspension including a damping device which damps force generated between a vehicle body and a wheel of a motorcycle;
a first control unit that controls a damping force of the damping device using a speed of change in a stroke amount, the stroke amount being an amount of displacement from a reference position of the wheel with respect to the vehicle body in an extension direction of the suspension;
a determination unit that determines whether the suspension goes into the most extended state under a first damping force controlled by the first control unit; and
a second control unit that controls the damping force so as to be greater than the first damping force when the determination unit determines that the suspension goes into the most extended state, wherein
the damping force is increased by the second control unit in such a manner that the suspension does not go into the most extended state.

4. The suspension device according to claim 3 , wherein
when the acceleration of the change in the stroke amount is equal to or greater than a predetermined value determined in advance, the determination unit determines whether the suspension goes into the most extended state.

5. The suspension device according to claim 4 , further comprising:
a predetermined value setting unit that sets the predetermined value such that the predetermined value is decreased as the stroke amount is decreased.

6. The suspension device according to claim 3 , wherein
the second control unit increases the damping force as the acceleration of the change in the stroke amount is increased.

7. The suspension device according to claim 4 , wherein
the second control unit increases the damping force as the acceleration of the change in the stroke amount is increased.

8. The suspension device according to claim 5 , wherein
the second control unit increases the damping force as the acceleration of the change in the stroke amount is increased.

Assignees

• Showa Corp
• Hitachi Astemo Ltd

Inventors

• Murakami Yosuke

Classifications

• B60G17/08 Primary

  Characteristics of fluid dampers (adjusting fluid dampers in general F16F9/44 - F16F9/53) · CPC title

• F16F9/48

  Arrangements for providing different damping effects at different parts of the stroke ({F16F9/346, F16F9/516} , F16F9/53 take precedence) · CPC title

• F16F9/512

  Means responsive to load action, {i.e. static load} on the damper or {dynamic} fluid pressure {changes} in the damper, {e.g. due to changes in velocity (F16F9/504, F16F9/516 take precedence; non-automatic damper adjustment from a distance using servo control, the servo pressure being created by the flow of damping fluid F16F9/465; self-pumping fluid springs in vehicle suspensions B60G17/044)} · CPC title

• F16F9/516

  resulting in the damping effects during contraction being different from the damping effects during extension {, i.e. responsive to the direction of movement (F16F9/504 takes precedence)} · CPC title

• B60G2202/24

  Fluid damper · CPC title