Adaptive TTC Calculation for Vehicle Acceleration States
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Solution Overview
Problem
Existing techniques for predicting a collision between a vehicle and an object face challenges in accurately calculating the estimated time-to-collision (TTC) in various situations, particularly when the vehicle is accelerating or decelerating, and when the object is likely to stop.
Innovation Solution
The proposed solution involves a TTC calculation apparatus that acquires distance, relative velocity, and relative acceleration to calculate TTC, using different formulas based on the vehicle's acceleration and the object's stopping state, ensuring accurate TTC calculation and reducing false alarms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a simple TTC calculation method using only distance and relative velocity is used, then the calculation is simple and quick, but the accuracy deteriorates when the vehicle is accelerating or decelerating
Solution Approach 1:
The patent applies dynamics by making the TTC calculation method adaptive to changing vehicle states. The system dynamically switches between different calculation formulas based on whether the own vehicle is accelerating or decelerating, and whether the object is likely to stop. This dynamic adaptation resolves the contradiction by selecting the appropriate level of calculation complexity for each situation.
Solution Approach 2:
The patent changes the parameters used in TTC calculation based on vehicle acceleration state. When the vehicle is accelerating, the system uses a calculation that incorporates relative acceleration; when decelerating, it uses a different formula. This parameter change approach allows accurate TTC calculation across different driving conditions without permanently increasing system complexity.
2Measurement precision
If TTC calculation is performed using multiple parameters including acceleration, then the accuracy improves, but the device complexity increases
Solution Approach 1:
The patent segments the TTC calculation process into multiple branches based on vehicle acceleration state and object stopping likelihood. Instead of using a single complex formula, the system divides the calculation into simpler sub-cases, each with its own appropriate formula. This segmentation reduces overall system complexity while maintaining accuracy for each specific situation.
Solution Approach 2:
The system dynamically selects which parameters to use based on current driving conditions. Acceleration parameters are only incorporated when the vehicle is accelerating, not during deceleration. This dynamic parameter selection avoids the need for a permanently complex calculation system while maintaining accuracy when needed.
3Ease of operation
If TTC calculation does not consider vehicle acceleration state, then the calculation method is simple, but false alarms increase during acceleration
Solution Approach 1:
The patent changes the calculation parameters based on vehicle acceleration state. When acceleration is detected, the system switches to a TTC calculation formula that incorporates relative acceleration, preventing false alarms. When decelerating, it uses a different formula. This conditional parameter change maintains simplicity for each case while improving overall reliability.
Solution Approach 2:
The system performs preliminary detection of vehicle acceleration state before performing TTC calculation. By detecting the acceleration state in advance, the system can select the appropriate calculation formula beforehand, preventing false alarms before they occur while maintaining a simple overall process flow.
Data Source
AI summary
An estimated time-to-collision (TTC) calculation apparatus includes a distance acquisition unit, relative velocity acquisition unit, relative acceleration acquisition unit, and estimated TTC calculation unit. The distance acquisition unit acquires a distance X between the own vehicle and an object. The relative velocity acquisition unit acquires a relative velocity V of the object with respect to the own vehicle. The relative acceleration acquisition unit acquires a relative acceleration β of the object with respect to the own vehicle. The estimated TTC calculation unit calculates an estimated TTC t until the own vehicle collides with the object. In this apparatus and method, the estimated TTC calculation unit calculates t, based on the distance X and the relative velocity V, when the own vehicle is accelerating, and when the own vehicle is decelerating, calculates t based on the distance X, the relative velocity V, and the relative acceleration β.