Flush Door Handle Fail-Safe Deployment Using Elastic Pretension

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Solution Overview

Problem

Flush door handles in vehicles fail to deploy automatically from a flush state to a deployed state when the vehicle is in an abnormal state, such as being powered off or having a failed driving device.

Innovation Solution

A flush door handle system incorporating a driving device, an elastic component, and an electromagnetic device, where the electromagnetic device is energized to attract the handle body against the elastic pretension force, and deenergized to allow the handle body to move to the deployed position under the pretension force, ensuring deployment even in abnormal conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the vehicle is powered off or the driving device fails, then the electromagnetic device cannot maintain attraction force, but the handle body fails to deploy automatically

Engineering Contradiction:

Improvedeployment reliability in abnormal statesVSAvoidautomatic deployment capability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The elastic component is pre-loaded to store potential energy that opposes the electromagnetic attraction force. This preliminary anti-action ensures that when power is lost, the stored elastic energy immediately becomes the dominant force, automatically deploying the handle body without requiring additional power or manual intervention.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

Instead of using the electromagnetic device to actively push the handle body outward, the system inverts the approach by using the elastic component to pull the handle body outward. The electromagnetic device merely needs to release its attraction rather than actively drive deployment, simplifying the failure mode and improving reliability.

Inventive Principle:

Principle #13The other way round (Inversion)

2Shape

If the electromagnetic device continuously attracts the handle body to maintain flush state, then aesthetic appearance is achieved, but energy is continuously consumed

Engineering Contradiction:

Improveflush state appearanceVSAvoidelectromagnetic device energy consumption

Core Design Contradiction:

ShapeVSUse of energy by moving object

Solution Approach 1:

The electromagnetic device operates periodically rather than continuously - energizing only when the handle body needs to be returned to the flush state after deployment. This periodic operation dramatically reduces energy consumption while maintaining the aesthetic flush appearance during normal operation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The elastic component serves itself by automatically returning to its pre-loaded state after the handle body is deployed. Once the handle body is pulled outward, the elastic component's stored energy automatically drives it back to the flush position, eliminating the need for continuous electromagnetic attraction and reducing energy consumption.

Inventive Principle:

Principle #25Self-service

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

Ensures the handle body is deployed rapidly and reliably in abnormal states, providing a space for manual operation, enhancing safety and reducing the need for redundant power supplies.

Implementation Method 1

the electromagnetic device is configured in such a way that the electromagnetic device attracts, when energized, the handle body such that the handle body is subjected to an acting force opposite to the pretension force

Methodology Applied

Scientific EffectElectromagnetic attraction: Electromagnet

Implementation Method 2

The elastic component is configured to provide the handle body with a pretension force for moving the handle body toward the deployed position

Methodology Applied

Scientific EffectElastic force: Elasticity

Data Source

PatentUS20260009268A1Flush Door Handle, Vehicle Comprising Same, and Control Method for Vehicle

Publication Date: 2026.01.08 ILLINOIS TOOL WORKS INC

AI summary

The present disclosure discloses a flush door handle, which comprises a driving device, a handle body, an elastic component, and an electromagnetic device. The flush door handle of the present disclosure can electrically drive the handle body to move between the flush position and the deployed position by means of the driving device. Moreover, the handle body can be released and driven to move to the deployed position when the vehicle is in an abnormal state, for example, when the vehicle is powered off or has a failed driving device, to provide an accommodating space into which an operator may insert his/her hand to open the vehicle door by pulling the handle body, and accordingly the safety and the reliability of the flush door handle are improved.