Adaptive Attention Display Timing for Vehicle Driving Assist
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Solution Overview
Problem
Existing vehicle driving assist apparatuses cause driver discomfort by continuing attention display operations after or just before passing a target object, due to predetermined display times and sudden changes in object movement or occlusions, leading to unnecessary attention draws or collisions.
Innovation Solution
A vehicle driving assist apparatus that uses object detection and electric control units to determine a predicted reaching time and lateral distance, adjusting the attention display operation based on thresholds to minimize discomfort, and includes forced-braking conditions to prevent collisions when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the attention display operation is performed with a predetermined display time to ensure complete information delivery to the driver, then the driver can be adequately informed of the target's existence, but the display operation continues after or just before the vehicle passes the target causing driver discomfort
Solution Approach 1:
The patent applies dynamics by making the display time adaptive rather than fixed. The control unit dynamically adjusts the display duration based on real-time parameters including predicted reaching time, lateral distance, and vehicle speed. This allows the system to extend display time when needed for complete information delivery while shortening it when the vehicle is approaching the target, thereby eliminating driver discomfort from prolonged displays after passing the target.
Solution Approach 2:
The system changes multiple parameters simultaneously to resolve the contradiction: display time is adjusted based on predicted reaching time and lateral distance thresholds. When the vehicle speed increases or the lateral distance decreases, the display time is reduced proportionally. This parameter adaptation ensures reliable information delivery while preventing the display from continuing unnecessarily after the vehicle passes the target.
2Speed
If the attention display operation starts immediately when the object is detected as a target, then the driver is informed promptly of the target's existence, but the display operation may continue unnecessarily after the vehicle passes the target
Solution Approach 1:
The system performs preliminary calculations before initiating the display operation. The control unit calculates the predicted reaching time and lateral distance in advance, then uses these pre-computed values to determine the optimal display start timing and duration. This preliminary action ensures prompt information delivery while pre-planning the display termination point to avoid unnecessary continuation after the vehicle passes the target.
Solution Approach 2:
The system continuously monitors vehicle position, target position, and calculated parameters during the display operation. This feedback mechanism allows the control unit to terminate the display operation at the precise moment when the vehicle passes the target, eliminating unnecessary display time. The feedback loop compares real-time position data against the predetermined thresholds to dynamically control display duration.
3Duration of action of moving object
If the predetermined display time is extended to ensure the driver has enough time to react, then the driver's reaction time is sufficient, but the display operation continues after the vehicle passes the target causing discomfort
Solution Approach 1:
The patent makes the display duration dynamic by linking it to vehicle speed and predicted reaching time. When vehicle speed is low or the target is far, the display time is extended to ensure adequate driver reaction time. When vehicle speed increases or the target is nearby, the display time is automatically reduced. This dynamic adjustment maintains sufficient reaction time while preventing discomfort from prolonged displays after passing the target.
Solution Approach 2:
The system changes the display time parameter based on multiple input parameters including vehicle speed, predicted reaching time, and lateral distance. The control unit calculates an optimal display duration that guarantees minimum reaction time while adapting to current driving conditions. This parameter transformation ensures driver safety through adequate reaction time while avoiding the discomfort of unnecessary extended displays.
Data Source
AI summary
The vehicle driving assist apparatus of the invention provides a display device with an attention display command when an attention condition that a time predicted for a vehicle to reach a target is larger than a lower limit threshold time and smaller than or equal to a display start threshold time is satisfied. The lower limit threshold time is larger than or equal to a display time required for one attention display operation to be completed. The display start threshold time is larger than the lower limit threshold time. When the attention display condition is not satisfied, the apparatus does not provide the display device with the attention display command.