Parking Assistance System Time-to-Collision Warning Logic
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Solution Overview
Problem
Existing parking assistance systems often provide inadequate collision warnings, especially at high speeds and when sensors are inactive or defective, leading to increased risk of collisions due to reliance on distance-based measurements and potential failure to detect parking limits.
Innovation Solution
A parking assistance system that calculates time to collision and distance to collision using parking space information, incorporating vehicle speed and sensor status, to generate perceptible warning signals with varying urgency levels, enabling collision warnings even if distance sensors are inactive or defective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking assistance system operates based on distance measurements from sensors, then the system can provide collision warnings, but the warning is delayed until just before contact because the stopping distance at high speed exceeds the remaining distance
Solution Approach 1:
The system performs preliminary calculation of the driving trajectory and time to collision before the actual parking maneuver begins. By pre-calculating the trajectory based on parking space information and vehicle speed, the system can determine when a collision would occur and issue warnings in advance, rather than reacting only when distance sensors detect proximity to an obstacle.
Solution Approach 2:
The system dynamically adjusts the warning threshold from a static distance-based approach to a time-based approach that accounts for vehicle speed. By calculating time to collision (TTC) and comparing it against a time threshold rather than relying solely on distance, the system can provide timely warnings even when the vehicle is moving at high speed, as the TTC calculation incorporates both distance and speed variables.
2Productivity
If the driver parks at higher speed relying on automatic steering intervention, then the parking maneuver is faster, but the stopping distance increases and the risk of collisions increases
Solution Approach 1:
The system continuously monitors vehicle speed and calculates the time to collision based on the current trajectory and parking space dimensions. This feedback mechanism allows the system to adjust warning thresholds dynamically - when vehicle speed is high, the time-based warning threshold activates to provide adequate warning time, and when speed is low, the system can use distance-based warnings. This feedback loop ensures that the warning system adapts to the actual parking conditions and maintains reliability regardless of parking speed.
3Device complexity
If the sensor detection range is limited or sensors are inactive, then the system cannot detect the parking limit, but this greatly increases collision risk because the driver relies on collision warnings
Solution Approach 1:
The system uses the parking space information calculated from sensor measurements as an intermediary to determine the time to collision. Even when the direct distance sensors are inactive or have limited range, the system can still calculate a trajectory and determine when the vehicle would collide with the parking limit by using the known parking space dimensions and current vehicle position. This intermediary calculation allows the warning system to function reliably without requiring continuous direct sensor contact with the obstacle.
4Device complexity
If the system uses distance-based warning signals, then the warning can be simple to implement, but the warning is too late when stopping distance exceeds remaining distance at high speed
Solution Approach 1:
The system changes the warning parameter from distance-based to time-based by calculating the time to collision. Instead of waiting for the distance sensor to detect when the vehicle is close to the obstacle, the system calculates how long until collision would occur based on current trajectory and speed, and issues a warning when this time exceeds a threshold. This parameter change from distance to time allows the system to provide advance warning even when the vehicle is moving at high speed, as the time calculation accounts for both distance and speed variables.
Data Source
AI summary
A parking assistance system for outputting parking instructions to the driver of a vehicle has a sensor device which is designed for performing a parking space measurement on the basis of parking space limits and generating parking space information on the basis of the parking space measurement; a program-controlled device which calculates the driving trajectory to be traveled on the basis of the parking space information generated and calculates a time to collision and/or a distance to collision, within which the vehicle will presumably collide with one of the parking space limits, from the parking space information generated and the calculated driving trajectory; and a warning signal transducer which generates a warning signal if the calculated period of time is less than a first limit value and/or the calculated distance to collision is less than a second limit value.