Suspension Load Weight Derivation for Accurate Damping Control

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Solution Overview

Problem

Existing load weight derivation methods are inaccurate when there is a significant difference between assumed and actual load weights, leading to inadequate or excessive damping force variations.

Innovation Solution

A load weight derivation device that calculates the contraction of a spring in a suspension system between a vehicle body and a wheel, using a stroke amount and movement of a support member to derive the actual load weight, allowing for precise control of damping force adjustments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If load weight is derived using conventional methods, then the derivation process is simple, but the accuracy of load weight specification deteriorates when there is a significant difference between assumed and actual load weights

Engineering Contradiction:
Improveload weight specification accuracyVSAvoidderivation process complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent segments the load weight derivation into two distinct components: stroke amount (suspension compression) and support member movement amount (adjustment unit displacement). By measuring these separately and combining them through calculation, the system achieves accurate load weight specification even when actual load differs significantly from assumed load, resolving the accuracy issue without requiring a completely new complex device.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent introduces the support member movement amount as an intermediary measurement that bridges the gap between assumed load and actual load. This intermediary parameter, when combined with stroke amount through calculation, enables accurate derivation of actual load weight, solving the accuracy problem while maintaining a relatively simple derivation process.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Reliability

If damping force is not adjusted according to actual load weight, then the control system is simple, but vehicle stability and comfort deteriorate

Engineering Contradiction:
Improvevehicle stabilityVSAvoidcontrol system complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a feedback mechanism where the derived actual load weight (from stroke amount and support member movement) is fed back to the damping force control system. This feedback enables the damping force to be automatically adjusted according to the actual load, improving vehicle stability and comfort while maintaining a relatively simple control system architecture.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The patent makes the damping force dynamic by linking it to the derived actual load weight. Instead of using a fixed or assumed load value, the system continuously adjusts damping force based on the dynamically derived actual load, thereby improving vehicle performance while keeping the control logic relatively simple.

Inventive Principle:
Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables accurate specification of load weight, ensuring appropriate damping force levels are maintained, even with varying loads, thereby improving vehicle stability and comfort.

Implementation Method 1

a spring (22s) arranged between a vehicle main body (10) and a wheel (3)

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentUS12134294B2Load weight derivation device, control device, suspension system, saddle-ride-type vehicle, vehicle height adjustment device
Publication Date: 2024.11.05 ASTEMO LTD
  • US12134294B2 patent drawing
  • US12134294B2 patent drawing
  • US12134294B2 patent drawing

AI summary

The load weight derivation device comprises a calculation unit that calculates a contraction amount of a spring in a suspension positioned between a vehicle body and a vehicle wheel, and a derivation unit that derives the weight loaded on the vehicle body using the contraction amount calculated by the calculation unit.