Parking Assist Wheel Stop Estimation for Faster Final Positioning
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Solution Overview
Problem
Existing parking assistance systems may result in prolonged travel at low speeds and reduced convenience when the steering angle becomes zero early, leading to inefficient vehicle positioning in parking spaces.
Innovation Solution
A parking assistance system that utilizes image recognition to estimate the wheel stop position, sets a contact assumption area, and adjusts vehicle speed and braking based on the type of recognition object (fixed or moving) to prevent forceful contact with the wheel stop, thereby optimizing vehicle positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the speed of the vehicle is greatly reduced from a time when the steering angle becomes zero, then the vehicle can prevent forceful contact with the wheel stop, but the distance and time for traveling at extremely low vehicle speed become long, lowering convenience
Solution Approach 1:
The system performs preliminary identification of the wheel stop position using image recognition before the vehicle reaches it. Based on this advance knowledge, the control unit calculates the appropriate distance from the wheel stop and sets a predetermined low speed accordingly, enabling the vehicle to maintain higher speed longer while still preparing for gentle contact or stop at the calculated position.
Solution Approach 2:
The system dynamically adjusts the contact preparation speed based on real-time conditions. The control unit calculates the distance to the wheel stop position and determines an appropriate low speed that balances safe contact prevention with efficient parking. This dynamic adjustment allows the vehicle to travel at higher speeds when possible and only reduce speed when necessary, optimizing both safety and convenience.
2Reliability
If the vehicle travels at low speed for a long distance to ensure safe contact with the wheel stop, then contact safety is improved, but the parking time increases, reducing productivity
Solution Approach 1:
The image recognition unit identifies the wheel stop position in advance, allowing the control unit to calculate the optimal distance and set the predetermined low speed before the vehicle needs to slow down. This preliminary action enables the vehicle to maintain higher speeds for longer distances, reducing overall parking time while ensuring safe contact.
Solution Approach 2:
The system changes the speed parameter dynamically based on the calculated distance to the wheel stop. By determining an appropriate low speed that is not excessively slow, the system optimizes the balance between safety and efficiency. The control unit adjusts this parameter in real-time, allowing faster travel when the distance is sufficient and slower travel only when necessary for safe contact.
Data Source
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AI summary
A parking assistance system includes a vehicle control unit, an image recognition unit, an object determination unit, and a wheel stop position estimation unit. The vehicle control unit sets a contact assumption area (A) based on an estimated wheel stop position (Pc) estimated by the wheel stop position estimation unit, and performs pre-stop control for causing a vehicle to travel at a contact preparation speed in the contact assumption area (A). In a case where a recognition object (R) is a fixed object, the vehicle control unit reduces the contact assumption area (A) to be smaller than a case where the recognition target (R) is a moving object.