Parking Assistance Speed Recalculation for Precise Stop Positioning
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Solution Overview
Problem
Existing parking assistance devices lack accuracy in guiding vehicles to target positions due to the calculation of target speed not being dynamically adjusted to match the vehicle's actual speed, leading to potential overrunning or undershooting of the target position.
Innovation Solution
A parking assistance device that includes a calculation unit to recalculate the target speed based on the vehicle's actual speed when specific events occur, such as starting the parking operation, reaching a predetermined distance, applying the brakes, or updating the target position, ensuring the target speed matches the actual speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the target speed is calculated without dynamic recalculation based on actual speed, then the processing load is reduced, but the parking accuracy deteriorates
Solution Approach 1:
The patent applies dynamics by transitioning from static target speed calculation to dynamic recalculation. The control unit continuously monitors actual vehicle speed and dynamically adjusts the target speed based on the difference between actual and target speeds, ensuring real-time adaptation to maintain parking accuracy without requiring overly complex processing systems.
Solution Approach 2:
The patent implements feedback control by using the actual vehicle speed as feedback information. The control unit calculates the speed difference between actual and target speeds, and uses this feedback to continuously recalculate and adjust the target speed, creating a closed-loop control system that improves parking accuracy while managing processing requirements.
2Measurement precision
If the target speed is frequently recalculated to match actual speed, then the parking accuracy is improved, but the processing load increases
Solution Approach 1:
The system dynamically adjusts the recalculation frequency and timing based on vehicle operation states. Recalculation is triggered by specific events such as changes in actual speed, distance to target position, or vehicle state changes, rather than continuous calculation, optimizing the balance between accuracy and processing efficiency.
Solution Approach 2:
The patent employs periodic recalculation triggered by specific events or time intervals. The control unit recalculatesthe target speed at predetermined timings based on vehicle operation states, such as when the actual speed changes significantly or when approaching the target position, rather than continuously, thus reducing unnecessary processing while maintaining accuracy.
3Ease of manufacture
If the target speed calculation does not consider actual speed, then the calculation is simpler, but the vehicle may overrun or undershoot the target position
Solution Approach 1:
The control unit uses actual vehicle speed as feedback to continuously monitor and adjust the target speed. By calculating the difference between actual and target speeds, the system ensures reliable position control and prevents overrun or undershoot of the target position while maintaining relatively simple calculation logic.
Solution Approach 2:
The patent changes the target speed parameter dynamically based on actual vehicle speed and operation state. The control unit adjusts the target speed parameter in response to changes in actual speed, distance to target, and vehicle state, ensuring reliable position control without requiring overly complex calculation systems.
Data Source
AI summary
A parking assistance device includes: a calculation unit that calculates a target speed with passage of time until a vehicle is moved to a parking target position; an event detection unit that detects an event that is a predetermined event indicating a timing of recalculation of the target speed; and an acquisition unit that acquires a current actual speed of the vehicle. Then, when the event is detected, the calculation unit recalculates the target speed to match the target speed with the current actual speed of the vehicle.