Vehicle Steering Control Ramp-Down for Lane-Keeping Handover
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Solution Overview
Problem
Current travel control devices for vehicles, such as lane departure prevention and lane keeping systems, cannot adjust the rate of decrease of automatic steering control quantities based on the magnitude relationship between target and actual control quantities when control ending conditions are met, leading to inefficient control transitions.
Innovation Solution
A travel control device that includes an object information acquisition system, automatic steering, and an electronic control unit to calculate and adjust the target correction quantity of the steering angle, allowing for variable degrees of decrease based on the relationship between target and actual control quantities, ensuring appropriate control ending conditions are met without unnecessary or premature termination of control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a preset rate of decrease is used for the control quantity of automatic steering when control ending conditions are satisfied, then the control transition is simple and stable, but the control cannot be adjusted according to the magnitude relationship between target and actual control quantities, leading to either prolonged unnecessary control or premature termination
Solution Approach 1:
The patent applies dynamics by making the decrease rate of the target correction quantity variable rather than fixed. The control system dynamically adjusts the decrease rate based on the magnitude relationship between target and actual control quantities, transitioning from a static preset rate to a dynamic adaptive rate that responds to real-time control conditions
Solution Approach 2:
The patent changes the parameter of the decrease rate from a constant preset value to a variable parameter that takes different values based on control conditions. When the actual control quantity is greater than the target, a first decrease rate is used; when it is less, a second decrease rate is used, thereby adapting the control behavior to the specific magnitude relationship
2Productivity
If the control quantity decreases gradually at a fixed rate, then the control transition is smooth and stable, but the control duration is not optimized, resulting in either unnecessarily prolonged control or premature ending
Solution Approach 1:
The patent implements feedback by continuously comparing the actual control quantity with the target control quantity and using this comparison result to adjust the decrease rate. The control system monitors the magnitude relationship between target and actual values and feeds this information back to modify the control termination behavior, ensuring both efficiency and reliability
3Adaptability or versatility
If a uniform decrease rate is applied regardless of the control situation, then the control logic is simple and easy to implement, but the control cannot adapt to different scenarios where the target and actual control quantities have different magnitude relationships
Solution Approach 1:
The patent applies local quality by applying different decrease rates to different local conditions of the control process. Instead of a single uniform rate, the system uses a first decrease rate when the actual control quantity exceeds the target and a second decrease rate when it is below the target, tailoring the control behavior to the specific local condition of the magnitude relationship
Data Source
AI summary
A travel control device for a vehicle includes an object information acquisition device, an automatic steering device, and an electronic control unit. The electronic control unit is configured to gradually decrease a target correction quantity of a steering angle when the electronic control unit determines that travel control needs to be ended. The electronic control unit is configured to change a degree of decrease of the target correction quantity to different degrees based on a magnitude relationship between a target control quantity and an actual control quantity closest to a time point at which it is determined that the travel control needs to be ended.