Turn Signal Stalk Auto-Return with Magnetic Lever Holding

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Solution Overview

Problem

Conventional turn signal devices in vehicles require manual steering wheel movement to cancel turn signals, which can be inconvenient and may lead to driver distraction or error during turns.

Innovation Solution

The development of cancellation devices that utilize actuators such as solenoids, electric motors, permanent magnets, pulsed magnetic elements, smart materials, or pumps to automatically pivot or move a lever (stalk) between turn positions and back to a neutral position, eliminating the need for manual steering wheel activation to cancel turn signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual steering wheel movement is used to cancel turn signals, then the turn signal can be canceled, but driver distraction and error risk increase

Engineering Contradiction:
Improveturn signal cancellation reliabilityVSAvoiddriver operation convenience
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The system uses the vehicle's own motion state (turn completion detection) to automatically trigger the cancellation action, making the system serve itself without requiring additional driver intervention. The control unit detects when the vehicle has completed its turn and automatically actuates the stalk return, eliminating the need for manual steering wheel manipulation.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The patent replaces the mechanical coupling between steering wheel rotation and stalk return with an electronic control system. Instead of relying on mechanical linkage that requires continuous driver steering input, the system uses sensors, control units, and electronic actuators to detect turn completion and automatically return the stalk, substituting mechanical operation with electronic automation.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Ease of operation

If automated actuators are used to return the stalk, then hands-free operation is enabled, but device complexity increases

Engineering Contradiction:
Improvehands-free operation capabilityVSAvoidcancellation device complexity
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The control unit performs multiple functions: it monitors vehicle motion state, detects turn completion, determines when cancellation is needed, and actuates the return mechanism. By consolidating these functions into a single control unit that can be integrated with existing vehicle systems, the patent reduces overall system complexity despite adding automated functionality.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent introduces a control unit as an intermediary between the vehicle's motion detection systems and the stalk actuation mechanism. This intermediary processes sensor data, makes cancellation decisions, and controls the actuator, thereby simplifying the architecture by centralizing control logic rather than requiring direct complex mechanical linkages between multiple components.

Inventive Principle:
Principle #24Intermediary (Mediator)

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 hands-free operation of turn signal cancellation, reducing driver distraction and improving safety by automatically returning the stalk to its original position after a turn is completed, maintaining tactile feedback and sound levels similar to conventional systems.

Implementation Method 1

a magnet to generate a force to hold the lever in the second, non-neutral position

Methodology Applied
Scientific EffectMagnetism: Magnetism

Implementation Method 2

a centering spring to naturally bias the lever back to the first, neutral position

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 3

a motor to move the lever back to the first, neutral position. The motor rotates in only a single rotational direction

Methodology Applied
Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Implementation Method 4

a pulsed magnetic element to generate a force to hold the lever in the second, non-neutral position, and to release the force to allow the centering spring to return the lever back to the first, neutral position

Methodology Applied
Scientific EffectPulsed Magnetism: Pulsed Magnet

Data Source

PatentUS12043169B2Cancellation device for an automotive feature
Publication Date: 2024.07.23 STRATTEC SECURITY CORP
  • US12043169B2 patent drawing
  • US12043169B2 patent drawing
  • US12043169B2 patent drawing

AI summary

A cancellation device for an automotive feature on a vehicle includes a lever to be manually moved relative to the vehicle from a first, neutral position to a second, non-neutral position to actuate the motor vehicle feature. The cancellation device also includes at least one magnet to move the lever back to the first, neutral position.