Vehicle Control System Adaptive Gain Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Automated turning control systems in vehicles often cause unsteady motion and driver discomfort due to mismatched vehicle travel intentions, leading to driver steering interventions that disturb the automated control, resulting in feelings of strangeness and annoyance.
Innovation Solution
A vehicle control system that includes a turning device, a steering sensor, and a control device to calculate a modification desire degree based on driver steering operations, executing system suppression processing by weakening the automated turning control when the modification desire degree exceeds a threshold, allowing the vehicle to continue following a target trajectory while reducing driver discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automated turning control operates to cancel driver steering operations, then the automated control maintains its target trajectory, but the vehicle produces unsteady motion and driver feels strangeness and annoyance
Solution Approach 1:
The control device changes the control gain parameter based on the modification desire degree. When the modification desire degree is high (driver frequently steers), the control gain is reduced to weaken the automated turning control's counteracting action. This parameter adjustment resolves the contradiction by making the automated control less intrusive when the driver is actively modifying the trajectory, thereby reducing unsteady motion and driver discomfort while maintaining trajectory tracking capability.
2Reliability
If the automated turning control counteracts driver steering operations, then the target trajectory is maintained, but the vehicle motion becomes unsteady
Solution Approach 1:
The automated turning control transitions from a static high-gain trajectory tracking mode to a dynamic adaptive control mode. The control gain is dynamically adjusted based on the modification desire degree calculated from steering sensor data. When driver intervention is detected (high modification desire degree), the system dynamically reduces the control gain to prevent excessive counteracting actions that cause unsteady motion, while still maintaining the ability to follow the target trajectory.
Solution Approach 2:
The control gain parameter is changed according to the modification desire degree. By reducing the control gain when the driver actively steers to modify the trajectory, the system prevents the automated control from producing strong counteracting forces that would create unsteady vehicle motion. This parameter adaptation resolves the contradiction between trajectory accuracy and motion stability.
3Extent of automation
If the automated turning control operates independently of steering operations, then automation level is maintained, but driver preference and feeling are not matched
Solution Approach 1:
The system introduces feedback from the steering sensor to detect driver steering operations and calculate the modification desire degree. This feedback loop allows the automated turning control to adapt to driver preferences and intentions. When the driver steers to modify the trajectory, the system detects this through the steering sensor and adjusts the control gain accordingly, enabling the automated control to align with driver preference while maintaining a high level of automation.
Solution Approach 2:
The automated turning control becomes dynamic and adaptive rather than rigid and fixed. By continuously monitoring steering operations and adjusting the control gain based on the modification desire degree, the system adapts to driver preferences in real-time. This dynamic adaptation allows the automated control to respect driver intentions while maintaining automation, resolving the contradiction between automation level and adaptability to driver preference.
Data Source
AI summary
A vehicle control system includes: a turning device that turns a wheel of a vehicle; a steering sensor that detects a driver's steering operation; and a control device configured to execute automated turning control that controls the turning device to automatically turn the wheel, independently of the driver's steering operation. A modification desire degree represents a degree to which the driver's steering operation modifies vehicle travel caused by the automated turning control. During execution of the automated turning control, the control device calculates the modification desire degree based on a result of detection by the steering sensor. When the modification desire degree exceeds a threshold, the control device executes system suppression processing without terminating the automated turning control. In the system suppression processing, the control device weakens the automated turning control as compared to a case where the modification desire degree is equal to or lower than the threshold.