Vehicle Stop Control Gain Adjustment for Accuracy and Comfort
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Solution Overview
Problem
Existing driving support apparatuses face a trade-off between achieving accurate vehicle stop positions and maintaining riding comfort, as increasing feedback gain to improve accuracy can lead to high-frequency vibrations and deteriorated comfort.
Innovation Solution
A driving support apparatus with a feedback control system that adjusts the feedback gain based on the remaining distance to the target stop position, increasing it for closer distances to enhance accuracy while keeping it lower for farther distances to prevent high-frequency vibrations, and includes speed and acceleration feedback systems with variable gains to optimize both accuracy and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the feedback gain is increased to improve stopping accuracy, then the vehicle can stop more accurately at the target position, but the vehicle speed vibrates at high frequency which deteriorates riding comfort
Solution Approach 1:
The feedback gain is made dynamically adjustable based on the remaining distance to the target stop position. The control device switches between a first feedback gain (higher) when the remaining distance is short and a second feedback gain (lower) when the remaining distance is long, allowing the system to optimize both stopping accuracy and riding comfort at different stages of the stopping process
Solution Approach 2:
The feedback gain parameter is changed based on the remaining distance condition. By comparing the remaining distance with a threshold value and adjusting the feedback gain accordingly, the system achieves high stopping accuracy when needed while preventing high-frequency vibrations that would deteriorate riding comfort
Data Source
AI summary
A driving support apparatus includes a feedback control system. The feedback control system calculates each operation amount of a brake actuator and a drive actuator so as to match an actual value of a control amount indicating a motion state of the vehicle to a target value. The target value of the control amount is set so as to stop the vehicle to a target stop position. The driving support apparatus sets, when remaining distance from a current position of the vehicle to the target stop position is first distance, a feedback gain of the feedback control system to large value, as compared with the feedback gain set when the remaining distance is second distance which is greater than the first distance.