Lane-Following Alert Control Using Lateral Acceleration Rise Rate

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Solution Overview

Problem

Existing vehicle driving support devices issue alerts only after the vehicle has deviated from the lane, failing to predict and notify the driver of potential lane-following issues before they occur.

Innovation Solution

A vehicle driving support device that uses the rate of increase in lateral acceleration to predict potential lane-following issues, issuing alerts when the lateral acceleration increase rate exceeds a predetermined threshold, and adjusts alert levels based on driver steering wheel operation to minimize annoyance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the alert is issued only when the deviation between required yaw rate and actual yaw rate is large, then the alert is issued after the vehicle has actually stopped following the lane, but the ability to predict and notify the driver before the vehicle stops following the lane is reduced

Engineering Contradiction:

Improvedetection accuracy of lane-following statusVSAvoidnotification timing

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system performs preliminary detection by monitoring the rate of change of lateral acceleration before the vehicle actually stops following the lane. By detecting rapid increases in lateral acceleration that indicate upcoming sharp curves or obstacles, the system issues alerts in advance, allowing the driver to prepare corrective actions before lane-following failure occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system provides a cushioning effect by issuing preliminary alerts that give the driver advance warning and time to respond. This early notification acts as a buffer between the onset of potential lane-following problems and actual lane deviation, allowing the driver to take corrective action before the situation becomes critical.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If the alert is issued when the lateral acceleration increase rate is high, then the driver can be notified of potential lane-following issues, but the driver may feel annoyed by false or unnecessary alerts

Engineering Contradiction:

Improvealert usefulnessVSAvoiddriver annoyance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The alert system dynamically adjusts its behavior based on real-time detection of steering wheel operations. When steering operations are detected, the system suppresses or cancels alerts that would otherwise be issued, adapting to the driver's active engagement with the vehicle and preventing unnecessary annoyance while maintaining reliability when the driver is not actively steering.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses feedback from steering wheel operation detection to modulate alert issuance. By continuously monitoring whether the driver is actively steering and using this information to control alert behavior, the system creates a feedback loop that prevents annoyance while maintaining alert usefulness, ensuring alerts are issued only when genuinely needed and not when the driver is already taking corrective action.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11780459B2Vehicle driving support device

Publication Date: 2023.10.10 TOYOTA JIDOSHA KK

AI summary

A vehicle driving support device issues an alert to notify a driver of a vehicle that there is a possibility of occurrence of a situation in which the vehicle is not able to travel along a lane. The vehicle driving support device issues an alert when an alert condition that a rate of increase in a lateral acceleration of the vehicle is equal to or larger than a predetermined rate of increase is satisfied.