Lane Departure Alert Control Using Lateral Acceleration Rate
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Solution Overview
Problem
Existing vehicle driving support devices issue alerts only after the vehicle has stopped following the lane, failing to predict and notify the driver of potential lane departure situations in time.
Innovation Solution
A vehicle driving support device that uses the rate of increase in lateral acceleration to predict potential lane departure situations and issues alerts before the vehicle actually stops following the lane, with adjustable alert levels based on driver steering wheel operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the alert is issued when the deviation between required yaw rate and actual yaw rate is large, then the vehicle following status can be detected, but the alert is issued after the vehicle has already stopped following the lane, reducing the effectiveness of early warning
Solution Approach 1:
The patent applies preliminary action by issuing an alert when the rate of increase in lateral acceleration reaches a predetermined threshold, which occurs before the vehicle actually stops following the lane. This predictive approach uses the derivative of lateral acceleration (dlady/dt) to anticipate lane departure, rather than waiting for the deviation between required and actual yaw rates to become large. The control unit calculates dlady/dt from lateral acceleration data and issues an alert proactively when this rate exceeds the threshold, providing early warning to the driver before the lane following status is completely lost.
2Reliability
If an alert is issued when the vehicle cannot travel along the lane, then lane departure can be notified, but the driver may feel annoyed when the alert is issued during normal steering operations
Solution Approach 1:
The patent applies dynamics by adjusting the alert issuance criteria based on the driver's steering wheel operation status. The control unit monitors whether the driver is operating the steering wheel and dynamically changes the alert behavior: when steering wheel operation is detected, the alert is suppressed or not issued; when no steering wheel operation is detected, the alert is issued if the lateral acceleration increase rate threshold is exceeded. This dynamic adaptation reduces driver annoyance during normal steering while maintaining effective warnings when the driver is not actively controlling the vehicle.
Data Source
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.