Vehicle Driving Control Apparatus with Dynamic Override Thresholds
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Solution Overview
Problem
Partially automated in-lane driving systems face challenges in preventing acceleration/deceleration and lane departure due to excessive driver operation intervention during transitions to fallback control modes, especially when the system operational design domain is deviated from.
Innovation Solution
A driving control apparatus with altered override threshold values for ACC and LKA functions, which are increased during system operational design domain deviations, to prevent excessive operation intervention and ensure smooth transition to fallback control, thereby preventing acceleration/deceleration and lane deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver is notified of ACC and LKA function stop and operation takeover request due to ODD deviation, then the driver can take over control, but the vehicle behavior becomes unstable due to excessive steering operation and accelerator/brake operation by the overwhelmed driver
Solution Approach 1:
The system applies preliminary anti-action by preemptively increasing the override threshold values before the driver can perform excessive operations. When ODD deviation is detected and takeover notification is issued, the system raises the threshold for accelerator, brake, and steering override operations. This preliminary adjustment prevents the driver's overwhelmed reactions from causing unstable vehicle behavior, as the elevated thresholds filter out excessive operational inputs during the critical transition period.
2Reliability
If the override threshold values are increased during ODD deviation, then excessive driver operation intervention is prevented, but the driver's ability to intervene when necessary is reduced
Solution Approach 1:
The system implements dynamics by making the override threshold values time-varying and condition-dependent. During normal operation, the threshold values remain at standard levels, allowing full driver adaptability. However, when ODD deviation occurs and takeover notification is issued, the threshold values dynamically increase to prevent excessive intervention. This dynamic adjustment ensures that the system adapts its characteristics based on the operational context, maintaining both reliability during critical transitions and flexibility during normal operation.
3Ease of operation
If fallback control is started after several seconds of notification, then the driver has time to respond, but the delay causes the vehicle to deviate further from the intended path
Solution Approach 1:
The system applies preliminary action by initiating threshold value increases immediately when ODD deviation is detected and takeover notification is issued, before the several-second delay period begins. This preliminary adjustment ensures that during the entire notification and transition period, the elevated thresholds are in place to prevent excessive driver operations that could cause path deviation. The preliminary action of raising thresholds proactively compensates for the delay in fallback control activation.
Data Source
AI summary
An ACC function for performing constant speed cruise according to a target speed when there is no preceding other vehicle in a vehicle's driving lane and performing following cruise by maintaining a predetermined inter-vehicle distance when there is a preceding other vehicle, an LKA function for maintaining cruise, an override function for stopping the ACC function and the LKA function by a driver's operation intervention, and a fallback function for performing fallback control of the ACC function and/or the LKA function, with notifying the driver of stopping the ACC function and/or the LKA function and operation takeover, at a time of system operational design domain deviation of the ACC function and/or the LKA function, override threshold values of the functions serving as a determination criterion of the operation intervention for stopping the ACC function and/or the LKA function at the time of system operational design domain deviation are configured to be altered to a value greater than during normal operation when the functions are within a system operational design domain.