Roundabout Turn Signal Cancellation Using Steering Pattern Detection

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Solution Overview

Problem

Automatic turn signal cancellation systems in vehicles struggle to accurately distinguish between normal turns and roundabout maneuvers, leading to premature cancellation of signals due to varying driving customs and steering patterns in roundabouts.

Innovation Solution

An automatic turn signal cancellation system that detects specific turn signaling patterns and vehicle turning dynamics to differentiate between entering and exiting a roundabout, using steering wheel angle thresholds and stability times to delay cancellation until the vehicle is truly exited.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Extent of automation

If the automatic turn signal cancellation system uses steering wheel angle to detect turn completion, then turn signal cancellation automation is improved, but premature cancellation in roundabouts occurs

Engineering Contradiction:

Improveautomatic turn signal cancellationVSAvoidturn signal cancellation accuracy

Core Design Contradiction:

Extent of automationVSReliability

Solution Approach 1:

The system dynamically adjusts the turn completion detection criteria based on detected driving patterns. When a roundabout pattern is identified (entering turn followed by opposite direction turn without neutral position), the system adapts by delaying cancellation until the vehicle completes the full roundabout cycle and returns to neutral, rather than using fixed steering angle thresholds

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system continuously monitors steering wheel angle and turn signal activation patterns to detect roundabout driving behavior. This feedback mechanism allows the system to distinguish between normal turns and roundabout maneuvers, adjusting cancellation timing accordingly to prevent premature signal deactivation

Inventive Principle:

Principle #23Feedback

2Ease of operation

If the turn signal stalk remains in the switch position until manually deactivated, then driver control is improved, but unintentional continuous signaling occurs

Engineering Contradiction:

Improvedriver controlVSAvoidunintentional continuous signaling

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The automatic turn signal cancellation system performs the cancellation function automatically based on detected turn completion, eliminating the need for the driver to manually return the stalk to neutral. The system serves itself by monitoring its own operational state and autonomously deactivating signals when appropriate

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12594877B2Automatic turn signal cancellation in a vehicle for a roundabout

Publication Date: 2026.04.07 VOLVO TRUCK CORP

AI summary

Automatic turn signal cancellation in a vehicle for a roundabout is disclosed. The automatic turn signal cancellation system is configured to not prematurely cancel a turn signal until the exit of the roundabout is confirmed. A first turn signal activation in an opposite direction of a first turn is detected to signify possible entry into a roundabout. Automatic cancellation of the first turn signal is delayed in response to detecting remaining within the roundabout based on the detected vehicle turning pattern. This can prevent the driver having to again activate the first turn signal within the roundabout. Detection of subsequent activation of a second turn signal opposite of the first turn signal direction may signify exiting the roundabout. The second turn signal is cancelled if the vehicle is detected to return to a turn neutral position steering direction for a defined period of time signifying completion of roundabout exit.