Driving Assistance Device Deceleration Detection and Index Calculation
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Solution Overview
Problem
Existing driving assistance systems fail to provide suitable assistance during vehicle deceleration and stop, as they do not adequately consider the driver's characteristics, particularly in situations where the time to collision, time headway, and following distance are critical for safe driving.
Innovation Solution
A driving assistance device comprising a deceleration detection unit, information calculation unit, and index calculation unit that detects deceleration start, calculates relevant indices such as time to collision, time headway, and following distance, and provides appropriate warnings or advice based on these indices to improve driver safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If driving assistance is provided based on general driving characteristics, then driver preference and habit can be accommodated, but driving assistance during deceleration and stop cannot be achieved
Solution Approach 1:
The system performs preliminary detection of deceleration start before the actual deceleration occurs by monitoring when the driver begins to operate the brake pedal in response to a preceding vehicle's deceleration. This allows the system to proactively calculate front information and provide assistance before the critical deceleration phase begins, ensuring reliable assistance during the entire deceleration and stop process
2Measurement precision
If multiple front information parameters are calculated (time to collision, time headway, following distance), then driving characteristic index accuracy is improved, but system complexity increases
Solution Approach 1:
The driving assistance device integrates multiple calculation functions into a single unified system. The same front information calculation unit computes time to collision, time headway, and following distance using a unified approach based on relative position and velocity data. This multi-functional design achieves high measurement precision for the driving characteristic index while avoiding the complexity of separate dedicated systems for each parameter
3Reliability
If real-time front information is calculated during deceleration, then driving safety is improved, but calculation time and processing load increase
Solution Approach 1:
The system begins calculating front information (time to collision, time headway, following distance) as soon as deceleration start is detected, rather than waiting until deceleration is well underway. This preliminary calculation approach ensures that safety-critical information is available immediately when needed, improving driving safety without significant processing delay
Solution Approach 2:
The system prioritizes and accelerates the calculation of front information during deceleration events. By identifying deceleration start as a critical event, the system rushes through the necessary calculations of time to collision, time headway, and following distance to provide timely safety assistance, skipping non-critical processing steps
Data Source
AI summary
A driving assistance device includes a deceleration detection unit, an information calculation unit, and an index calculation unit. The information calculation unit obtains at least one type of front information including a time to collision until an own vehicle collides with a preceding vehicle, a time headway until the own vehicle reaches a position of the preceding vehicle, and a following distance between the own vehicle and the preceding vehicle when the own vehicle stops, after a deceleration start of the own vehicle. The index calculation unit obtains an index indicating a driving characteristic that is a characteristic of a driving operation of a driver, based on the front information.