Vehicle Speed Control Feedback Correction for Model Mismatch
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Solution Overview
Problem
Vehicle speed control systems face inaccuracies when the vehicle model used for control does not match the actual vehicle's state, leading to deviations in acceleration/deceleration from target values.
Innovation Solution
A speed control assistance apparatus that acquires target acceleration/deceleration instructions and detects actual vehicle acceleration/deceleration, using a reference model to determine corrected acceleration/deceleration by adjusting for differences, and selecting models based on vehicle weight, steering angle, and road curvature to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a vehicle model is used to determine acceleration/deceleration for speed control, then the control process can be automated and executed in constant cycles, but the control accuracy deteriorates when the model does not match the actual vehicle state
Solution Approach 1:
The patent implements feedback by detecting the actual acceleration/deceleration of the vehicle and comparing it with the model acceleration/deceleration from the vehicle model. The difference (deviation) is fed back to correct the target acceleration/deceleration instructions, thereby improving control accuracy while maintaining automation. This is embodied in the determining part that calculates corrected target values based on the detected deviation.
Solution Approach 2:
The system performs self-correction by automatically adjusting the target acceleration/deceleration based on the detected deviation between actual and model values. The speed control apparatus itself generates the correction without external intervention, making the system self-sufficient in maintaining accuracy despite model mismatches.
2Productivity
If the target acceleration/deceleration is determined using a vehicle model, then the speed control can be executed automatically, but the acceleration/deceleration deviates from the target value when the model does not match the actual vehicle
Solution Approach 1:
The determining part continuously monitors the deviation between detected actual acceleration/deceleration and model acceleration/deceleration, and automatically adjusts the target acceleration/deceleration to compensate for model inaccuracies. This feedback mechanism maintains both high execution efficiency and reliable control accuracy.
Solution Approach 2:
The system dynamically changes the target acceleration/deceleration parameter based on the detected deviation. When the vehicle state diverges from the model prediction, the target values are adjusted to reflect actual vehicle behavior, ensuring reliable control while maintaining efficient execution.
3Device complexity
If a single vehicle model is used for speed control, then the device complexity is reduced, but the adaptability to different vehicle states and conditions deteriorates
Solution Approach 1:
The speed control apparatus automatically adapts to different vehicle states by detecting actual acceleration/deceleration and self-correcting the target values based on the deviation from the model. This self-adjusting capability provides adaptability to various vehicle conditions without requiring multiple complex models or manual intervention.
Data Source
AI summary
A speed control assistance apparatus includes: an acquiring part that acquires a target acceleration/deceleration instruction indicating a target acceleration/deceleration of a vehicle; a detecting part that detects an acceleration/deceleration of the vehicle; a storage part that stores a reference model outputting a model acceleration/deceleration, which is the acceleration/deceleration of the vehicle when the target acceleration/deceleration was input; and a determining part that determines a corrected acceleration/deceleration, which is an acceleration/deceleration to be indicated to a speed control part controlling the speed of the vehicle at a second timing in a cycle subsequent to a cycle corresponding to the first timing, by adding a difference between the acceleration/deceleration detected by the detecting part at the first timing and the model acceleration/deceleration output by the reference model to which the target acceleration/deceleration instruction at the first timing is input, to an acceleration/deceleration corresponding to the target acceleration/deceleration instruction.