Parking Assistance Device with Minimum Projection Amount Calculation
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Solution Overview
Problem
Existing parking assistance devices cannot easily determine whether a vehicle can be parked in a selected parking frame without generating a route, leading to inefficient selection and potential failure in finding a suitable parking space.
Innovation Solution
A parking assistance device that calculates a minimum projection amount required for a vehicle to rotate within the space configured by the parking frame and passage, comparing this with the passage width to determine if the vehicle can be parked, thereby preventing the selection of unparkable frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a route is generated for each parking frame to determine parkability, then the accuracy of parkability determination is improved, but the calculation load and processing time increase significantly
Solution Approach 1:
The invention extracts the essential geometric parameters (passage width, parking frame dimensions, vehicle dimensions) from the complex route generation problem. Instead of performing full route generation calculations, the system extracts only the necessary dimensional information to compute the minimum projection amount, thereby simplifying the determination process while maintaining accuracy.
Solution Approach 2:
The system performs preliminary calculations of the minimum projection amount using only geometric parameters before actual parking maneuver execution. This preliminary assessment of parkability based on dimensional constraints allows the system to quickly eliminate unparkable frames without committing to full route generation, reducing overall computational burden.
2Reliability
If routes are generated for all detected parking frames while searching, then complete parkability information is obtained, but the processing time and computational resources are excessively consumed
Solution Approach 1:
The invention applies partial action by computing only the minimum projection amount based on geometric parameters rather than performing complete route generation for all parking frames. This partial calculation provides sufficient information to determine parkability in most cases, allowing the system to quickly assess multiple parking frames without exhaustive computation.
Solution Approach 2:
The system performs preliminary geometric parameter extraction and minimum projection amount calculation for all detected parking frames before the driver makes a selection. This preliminary assessment prepares parkability information in advance using lightweight calculations, so that when the driver selects a frame, the system has already determined whether it is parkable without requiring time-consuming route generation at that moment.
3Ease of manufacture
If the minimum projection amount is calculated without considering turning radius, then the calculation process is simplified, but the result may be less accurate for actual parking maneuvers
Solution Approach 1:
The invention extracts the fundamental geometric constraint (minimum projection amount) from the complex turning motion analysis. By separating the essential dimensional requirement from the detailed turning trajectory considerations, the system obtains a simplified yet effective metric for assessing whether a passage is wide enough for parking maneuvers.
Solution Approach 2:
The system changes the parameter of interest from complex turning trajectory parameters (which require dynamic simulation) to static geometric parameters (passage width, vehicle dimensions, parking frame dimensions). This parameter transformation simplifies the calculation while maintaining the essential information needed to determine whether a passage is sufficiently wide for parking.
Data Source
AI summary
A parking frame for which a parking route cannot be generated is excluded from selection objects by a simple determination. The parking assistance device acquires information on an entrance width of a frame entrance of the parking frame and information on a passage width of a passage, and calculates a minimum projection amount wm in a passage width direction of a vehicle 220 from the parking frame 203 to the passage 205 when a vehicle corner on a front side of the vehicle in an approach direction to the parking frame and on a first side in a vehicle width direction is located at the entrance end on the first side of the parking frame in the frame width direction, and when the vehicle is disposed at a position where the vehicle side part on a second side of the vehicle in the vehicle width direction is in contact with the entrance end on the second side of the parking frame in the frame width direction. This minimum projection amount wm is a minimum passage width required for rotating the vehicle from a direction at a start of parking to a direction at a completion of parking without considering a turning radius in a space configured by the parking frame and the passage. The passage width wr is compared with the minimum projection amount wm, and when the passage width is smaller than the minimum projection amount, it is determined that the vehicle cannot be parked in the parking frame.