Driving Assistance System Notification Sequencing
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Solution Overview
Problem
In driving assistance systems that perform both inter-vehicle distance control over the full vehicle speed range and forward vehicle start notification, notifications from the full speed range ACC and LVN can occur simultaneously, potentially annoying the driver.
Innovation Solution
A driving assistance system with an electronic control unit and notifying unit that detects inter-vehicle distance and relative velocity, performs a first notification when the inter-vehicle distance exceeds a predetermined distance and relative velocity meets a certain threshold, and sets a reference inter-vehicle distance, ensuring subsequent notifications are only made when the inter-vehicle distance exceeds a predetermined difference from this reference, thus avoiding simultaneous notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both full speed range ACC and LVN are used in the same vehicle with different notification conditions, then the driver can be notified of forward vehicle starting under different scenarios, but notification under full speed range ACC and notification under LVN may be carried out at substantially the same time, potentially annoying or disturbing the driver
Solution Approach 1:
The system performs preliminary action by having the full speed range ACC notify the driver first when notification conditions are met. The LVN function then monitors whether this preliminary notification has occurred before issuing its own notification, preventing simultaneous notifications and driver disturbance
Solution Approach 2:
The notification condition determination unit acts as an intermediary between the full speed range ACC and LVN functions. It receives notification condition information from both functions and determines the final notification timing, ensuring that LVN notifications are suppressed when ACC notifications have already occurred, thus preventing simultaneous notifications
Data Source
AI summary
A driving assistance system includes an electronic control unit and a notifying unit. The electronic control unit detects an inter-vehicle distance and relative velocity, controls the subject vehicle, performs a first notification operation when the inter-vehicle distance becomes equal to or larger than a first distance and the relative velocity becomes equal to or higher than a first velocity, or equal to or larger than a second distance, sets an inter-vehicle distance when the forward vehicle and the subject vehicle are stopped as a reference inter-vehicle distance and performs a second notification operation when a difference between the reference inter-vehicle distance and the inter-vehicle distance becomes equal to or larger than a third distance. The electronic control unit does not perform the second notification operation at least until after the first notification operation is performed.