Vehicle Driving Control Apparatus Override Threshold Adjustment
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Solution Overview
Problem
Partially automated in-lane driving systems face instability due to sudden acceleration/deceleration and lane departure caused by excessive driver intervention during transitions to fallback control when the LKAS system limit is exceeded, leading to incorrect determination of steering and acceleration/deceleration intentions.
Innovation Solution
A driving control apparatus with altered override threshold values for the ACC and LKA functions during system limits, preventing sudden changes by increasing the threshold values to avoid immediate takeover and allowing smoother transition to fallback control, thereby preventing sudden acceleration/deceleration and lane deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the override threshold value is set to a normal level during LKAS system limit, then the driver's steering intervention is detected quickly, but sudden acceleration/deceleration and lane departure occur due to excessive driver operation
Solution Approach 1:
The override threshold value is dynamically adjusted based on the operational state of the LKAS. During normal operation, the threshold is set at a standard level for quick intervention detection. When the LKAS reaches its system limit, the threshold is automatically increased to a higher value, preventing excessive driver operations that would cause sudden vehicle behavior changes. This dynamic adjustment resolves the contradiction by adapting the detection sensitivity to the current system state.
Solution Approach 2:
The patent changes the parameter of the override threshold value from a fixed normal level to a variable level that increases during LKAS system limit. This parameter change allows the system to differentiate between normal steering corrections and excessive interventions, thereby maintaining vehicle stability while still detecting genuine driver takeover intentions.
2Stability of the object's composition
If the override threshold value is increased during LKAS system limit, then vehicle stability is maintained during transition, but the response time for detecting driver takeover intention is delayed
Solution Approach 1:
The system dynamically adjusts the override threshold based on the LKAS operational state. When the LKAS is within its operational limits, the normal threshold applies for quick response. When the LKAS reaches its system limit, the threshold temporarily increases to maintain stability during the transition period. Once the transition is complete and the system stabilizes, the threshold returns to the normal level, restoring fast response capability. This dynamic adjustment minimizes time loss while maintaining stability during critical transitions.
3Speed
If fallback control is initiated immediately when LKAS system limit is exceeded, then the transition to manual driving is fast, but the driver becomes overwhelmed causing excessive operation intervention
Solution Approach 1:
The system performs preliminary action by notifying the driver in advance that the LKAS is approaching its system limit and that fallback control will be initiated. This advance notification allows the driver to mentally prepare for the transition, reducing overwhelm and excessive reactions. The gradual preparation phase before immediate fallback control helps maintain ease of operation while still enabling fast transition when necessary.
Data Source
AI summary
In a driving control apparatus for a vehicle having 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 in the vehicle's driving lane by following control to a target path, an override function for stopping the ACC function and the LKA function by a driver's operation intervention, and a function for notifying the driver of stopping the LKA function and the ACC function and operation takeover and performing fallback control of the LKA function and the ACC function at the time of system limit of the LKA function, override threshold values serving as a determination criterion of the operation intervention for stopping the LKA function and the ACC function at the time of system limit of the LKA function are configured to be altered to a value greater than during normal operation when the LKA function is within the system limit.