Vehicle Course Estimation Using Reference Speed and Direction Indicators
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Solution Overview
Problem
Existing vehicle course estimation devices inaccurately estimate the vehicle's course due to deviations in driving data from predefined templates, especially under varying traffic conditions.
Innovation Solution
A vehicle course estimation device that includes direction indicator detection, distance detection, and reference speed calculation to estimate the vehicle's course based on its speed relative to a calculated reference speed for arriving at an intersection, considering deceleration operations and steering amounts, and distinguishes between direction changes and avoidance maneuvers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a template-based estimation method is used, then the device complexity is reduced, but the measurement precision of vehicle course estimation deteriorates
Solution Approach 1:
The invention changes the estimation parameters from template-matching metrics to physical vehicle parameters (speed, direction indicator state, distance to intersection). By calculating reference speed based on distance and time, and comparing actual speed against this reference, the system achieves accurate course estimation without relying on predefined templates, thus resolving the contradiction between simplicity and precision.
2Measurement precision
If the determination conditions for deceleration operation are made more sensitive, then the measurement precision of course estimation is improved, but the reliability of deceleration detection deteriorates
Solution Approach 1:
The invention makes the determination conditions dynamic by adjusting the reference speed threshold based on the calculated reference speed (distance to intersection divided by predetermined time). As the vehicle approaches the intersection, the reference speed automatically adjusts, allowing the system to maintain high sensitivity for course estimation while avoiding false deceleration detections. This dynamic adaptation resolves the contradiction between precision and reliability.
Data Source
AI summary
A vehicle course estimation device which includes: a direction indicator sensor which detects an operating state of a direction indicator of a vehicle; a distance detection section which detects a distance between the vehicle and an intersection located at a travel direction side of the vehicle; a reference speed calculation section which calculates a reference speed, which is a speed for the vehicle to arrive at the intersection after a predetermined time, on the basis of the distance between the vehicle and the intersection located at the travel direction side of the vehicle, which has been detected by the distance detection section, when an operation of the direction indicator is detected by the direction indicator sensor; and a course estimation section which estimates a course of the vehicle on the basis of a speed of the vehicle with respect to the reference speed calculated by the reference speed calculation section.