Driving Control Device Transition Time-Frame Steering Torque
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Solution Overview
Problem
Existing driving control systems cause driver discomfort due to sudden changes in steering torque when switching from automatic lane change control to lane keeping control, leading to an unsettled driving experience.
Innovation Solution
A driving control device that includes a lane marking recognition section, a lane keeping controller, a lane change controller, and a switching controller, which sets a transition timeframe for smooth switching between lane change and lane keeping control, gradually adjusting steering torque to minimize divergence and maintain a stable driving experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If lane change control and lane keeping control are switched immediately without transition, then switching speed is improved, but driver comfort deteriorates due to sudden steering torque changes
Solution Approach 1:
The patent applies dynamics by making the control amount changeable over time during the transition period. The switching controller dynamically adjusts the control amount from lane change control to lane keeping control according to a transition formula, allowing smooth adaptation rather than abrupt switching. This resolves the contradiction by maintaining driver comfort while achieving timely switching through controlled temporal evolution of control parameters.
Solution Approach 2:
The patent implements preliminary action by setting a transition period before completing the control switch. During this transition period, the system prepares for the switch by gradually adjusting the control amount using a predetermined transition formula, ensuring that the full switch to lane keeping control occurs smoothly without sudden torque changes. This preliminary transition phase prevents driver discomfort while maintaining efficient switching.
2Object-affected harmful factors
If lane change control and lane keeping control are switched gradually with transition, then driver comfort is improved, but switching time increases
Solution Approach 1:
The patent applies parameter changes by modifying the control amount parameter over time during the transition. The switching controller uses a transition formula that changes the control amount from the lane change control value to the lane keeping control value within a specified transition period. This controlled parameter evolution achieves smooth switching that maintains driver comfort while limiting the time loss through defined transition boundaries.
Solution Approach 2:
The patent implements continuity of useful action by ensuring the control amount changes continuously during the transition period rather than discontinuously. The transition formula maintains a continuous control signal throughout the switching process, preventing interruptions or sudden jumps in steering torque. This continuous action preserves driver comfort while achieving the switch within a reasonable time frame.
3Manufacturing precision
If separate steering control for lane changing and lane keeping is used, then control precision is improved, but system stability deteriorates during switching
Solution Approach 1:
The patent introduces an intermediary element - the switching controller with transition formula - that mediates between lane change control and lane keeping control. This intermediary smoothly transitions the control amount from one mode to the other, preventing direct conflict between the two separate control systems. The intermediary ensures system stability during switching while preserving the precision benefits of separate control modes.
Solution Approach 2:
The patent applies dynamics by making the control system adaptable during the transition period. The switching controller dynamically adjusts the control amount based on the transition formula, allowing the system to evolve smoothly from lane change control to lane keeping control. This dynamic adjustment maintains system stability while preserving the precision of both separate control modes during their respective operational phases.
Data Source
AI summary
When performing a switch between the lane change control and the lane keeping control, a switching controller of the driving control device sets a transition time-frame for performing the switch, and gradually switches between the lane change control and the lane keeping control during the transition time-frame.