Adaptive Time To Collision Calculation Using Probability Correction
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Solution Overview
Problem
Current methods for calculating the time to collision (TTC) with a vehicle ahead are inadequate as they fail to account for the vehicle's hypothetical behavior, such as deceleration and lane changes, leading to inaccurate collision time predictions and potential false warnings.
Innovation Solution
A method and device that continuously calculate TTC by assuming different hypothetical behaviors of the vehicle ahead, such as deceleration and lane changes, and adjust the collision time calculation using probability-based correction values to refine the reaction timing, including a detection unit for distance and relative speed, and a calculation unit to determine the improved TTC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the TTC calculation assumes the vehicle ahead maintains deceleration until standstill, then the collision time prediction is simplified, but the accuracy deteriorates due to unrealistic hypothetical behavior
Solution Approach 1:
The patent applies dynamics by making the TTC calculation adaptive to the actual behavior of the vehicle ahead. Instead of assuming constant deceleration to standstill, the system dynamically adjusts the hypothetical behavior model based on detected deceleration patterns, allowing the calculation to reflect real-world scenarios where vehicles may not always decelerate to complete stop.
Solution Approach 2:
The invention changes the parameter of hypothetical behavior from fixed (deceleration to standstill) to variable based on detected deceleration values. When deceleration exceeds a threshold, the system adjusts the assumed behavior accordingly, changing the calculation parameters to match realistic driving scenarios rather than maintaining a static assumption.
2Productivity
If the TTC calculation uses basic distance and speed variables, then the calculation is fast and simple, but the reliability deteriorates due to false warnings from inaccurate predictions
Solution Approach 1:
The system performs preliminary detection of deceleration behavior before finalizing the TTC calculation. By detecting whether the vehicle ahead is decelerating and by how much, the system prepares appropriate hypothetical behavior models in advance, allowing for more reliable predictions without significantly increasing calculation time during the critical TTC determination phase.
3Speed
If the system reacts immediately to detected deceleration, then the responsiveness is improved, but the reliability worsens due to premature reactions to transient deceleration events
Solution Approach 1:
The patent applies preliminary anti-action by counteracting premature reactions through a filtering mechanism. Before triggering a warning or response, the system checks whether the detected deceleration pattern is sustained and significant enough to warrant reaction. This preliminary check prevents false reactions to transient deceleration events while maintaining rapid response to genuine collision threats.
Data Source
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AI summary
Based on the assumption that a preceding vehicle does not brake to a halt, but only reduces its speed for certain time, an improved TTC (Time To Collision) can be calculated. By means of the difference between the TTC with braking to a halt and the improved TTC, a probability for the occurrence of a hypothesis concerning the further behavior of the preceding vehicle can be reduced.