Parking Assistance Speed Control for Low-Precision Position Estimation
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Solution Overview
Problem
When the calculation precision of the relative position between the target parking position and the own vehicle is low, there is a risk of discomfort for the passenger during autonomous vehicle movement to the target parking position.
Innovation Solution
A parking assistance method that includes detecting a target object around the own vehicle using a sensor, retrieving known target objects and their relative positional relationships with the target parking position from a storage device, estimating the relative position of the target parking position based on detected and known positions, calculating a target travel trajectory, determining the estimation precision, and adjusting the speed limit of the vehicle's movement speed based on the precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the own vehicle is caused to move to the target parking position based on low-precision relative position calculation, then the parking assistance function can be provided, but the passenger experiences a sense of discomfort
Solution Approach 1:
The patent applies dynamics by making the vehicle speed adaptive rather than fixed. The speed limit is dynamically adjusted based on the estimated precision of relative position calculation. When precision is high, higher speeds are permitted; when precision is low, speeds are restricted. This dynamic adjustment resolves the contradiction by allowing the parking assistance function to operate across varying precision conditions while maintaining passenger comfort through appropriate speed modulation.
Solution Approach 2:
The patent changes the parameter of vehicle speed based on the precision level of position estimation. By establishing a relationship between estimation precision and speed limits, the system adapts its operational parameters to the current measurement quality. This parameter change strategy enables the system to provide parking assistance functionality even with low-precision calculations, while preventing passenger discomfort by restricting speed when precision is insufficient.
2Productivity
If the vehicle moves at high speed with low estimation precision, then productivity is improved, but the sense of discomfort to the passenger increases
Solution Approach 1:
The patent implements feedback by continuously monitoring the estimated precision of relative position calculation and using this information to adjust the vehicle speed limit. The system evaluates the precision level and feeds this information back to the speed control mechanism, which then appropriate the speed limit accordingly. This feedback loop ensures that productivity is maximized when precision is high, while passenger comfort is protected when precision is low, resolving the contradiction between speed and discomfort.
Solution Approach 2:
The system makes the speed limit dynamic rather than fixed, allowing it to vary based on real-time precision assessment. When estimation precision is high, the system permits higher speeds to improve productivity. When precision drops, the system automatically reduces the speed limit to prevent passenger discomfort. This dynamic adaptation resolves the contradiction by allowing the system to optimize for productivity under favorable conditions while protecting against harmful effects when conditions deteriorate.
Data Source
AI summary
A parking assistance method including: detecting a target object position that is a relative position with respect to the own vehicle; retrieving a known target object and a relative positional relationship between the known target object and a target parking position from a storage device; based on the detected target object position detected and a relative positional relationship between the known target object and a target parking position, estimating a relative position of the target parking position with respect to a current position of the own vehicle; based on the estimated relative position, calculating a target travel trajectory from a current position of the own vehicle to the target parking position; determining estimation precision of the estimated relative position; when the estimation precision is low, limiting a speed limit of movement speed at which the own vehicle is caused to travel along the target travel trajectory to a speed lower.