Reverse Travel Determination Using Turn Signal Time-Distance Gating
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Solution Overview
Problem
Existing reverse traveling determination devices often result in erroneous determinations, incorrectly identifying a vehicle as traveling in reverse due to misrecognition of sign symbols.
Innovation Solution
A reverse traveling determination device that only performs reverse traveling determination after a direction indicator is operated, and then only until a predetermined time or distance has passed, thereby reducing erroneous determinations by aligning with situations where reverse traveling is more likely to occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reverse traveling determination is performed continuously based on sign symbol recognition, then reverse traveling can be detected, but erroneous determination occurs due to misrecognition of sign symbols
Solution Approach 1:
The system performs preliminary actions by checking direction indicator operation status and setting determination time/distance counters before performing reverse traveling determination. This preliminary filtering ensures that determination only occurs under appropriate conditions (when direction indicator is on and within determination time/distance thresholds), preventing erroneous determination from misrecognized sign symbols during inappropriate periods.
2Reliability
If reverse traveling determination is performed all the time, then no reverse traveling is missed, but unnecessary determinations increase computational load and reduce system efficiency
Solution Approach 1:
The system implements periodic action by controlling the determination execution unit to perform reverse traveling determination only at specific periods - when the direction indicator is operated and within the determination time/distance period from the operation timing. This periodic execution pattern balances detection completeness with computational efficiency by avoiding unnecessary determinations during periods when reverse traveling is unlikely.
3Reliability
If determination time period is extended to cover more scenarios, then more reverse traveling cases are detected, but erroneous determination risk increases
Solution Approach 1:
The system dynamically adjusts determination parameters (determination time period and determination distance period) based on direction indicator operation. When the direction indicator is on, the determination time counter resets and determination distance counter resets, extending the determination window. When the direction indicator turns off, these counters are cleared, reducing the determination window. This parameter change strategy adapts the determination coverage to match the likelihood of reverse traveling occurrence.
Data Source
AI summary
A reverse traveling determination device that performs reverse traveling determination of determining whether a vehicle is traveling in reverse includes a direction indicator determining unit configured to determine whether a direction indicator of the vehicle has been operated. The reverse traveling determination is not performed after a predetermined time has passed or the vehicle has traveled a predetermined distance after the direction indicator determining unit has determined that the direction indicator has been operated.