Flush Vehicle Door Handle Control for Half-Latch Recognition

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Solution Overview

Problem

The existing door handle control systems for vehicles face challenges in improving the opening and closing operability of side doors while maintaining a flush surface design and controlling production costs.

Innovation Solution

A door handle control device that includes a handle lever capable of projecting from a storage position, a position detection unit, a latch mechanism, a state detection unit, a position change unit, and a control unit. The control unit changes the handle lever's position to a gripping position when the latch is not in the full-latch state, allowing occupants to visually recognize the half-latch state without additional notification mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If the handle lever is kept at the storage position (flush with door panel) to maintain design appearance, then the aesthetic quality is improved, but the operability deteriorates when the latch is in half-latch state

Engineering Contradiction:

Improveflush surface designVSAvoiddoor closing operability

Core Design Contradiction:

ShapeVSEase of operation

Solution Approach 1:

The handle lever dynamically changes its position between storage position (flush with door panel) and gripping position (projecting outward) based on the latch state detection, allowing the system to adapt between aesthetic mode and operational mode automatically

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The latch state detection unit provides feedback about the latch engagement state to the control unit, which then controls the position change unit to adjust the handle lever position accordingly, creating a closed-loop control system

Inventive Principle:

Principle #23Feedback

2Loss of information

If a dedicated notification mechanism is added to indicate half-latch state, then the information notification is improved, but the device complexity increases

Engineering Contradiction:

Improvelatch state notificationVSAvoidnotification device structure

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The handle lever serves multiple functions: it acts as both the door opening/closing actuator and as a visual notification indicator for the latch state, eliminating the need for separate notification mechanisms

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The handle lever itself provides the notification function by changing its position to indicate latch state, making the system self-navigating without requiring external notification devices

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12312844B2Door handle control device of vehicle

Publication Date: 2025.05.27 MAZDA MOTOR CORP

AI summary

A vehicle having improved opening and closing operability of a side door includes a lever that projects to an outer side in a vehicle width direction from a storage position at which the handle lever is flush with the surface of a door outer panel, a position switch that detects the movement position of the lever, a latch mechanism that has a latch engageable with a striker in conjunction with the lever, a latch switch that detects whether the latch is in a full-latch state, a driving device capable of changing the position of the lever in a range from the storage position to a gripping position, and a CPU capable of controlling the driving device, in which the CPU forcibly changes the position of the lever to the gripping position when the latch is in a half-latch state and the lever is at the storage position.