Traffic Light Deceleration Control for Smoother Red-Arrow Response
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Solution Overview
Problem
Existing vehicle control systems face challenges in starting deceleration at an early timing when a red light is turned on, leading to uncomfortable changes in acceleration for occupants due to delayed recognition of arrow signals, resulting in increased deceleration rates and larger changes in acceleration when deceleration control is unnecessary.
Innovation Solution
A vehicle control device and method that recognizes the lighting state of main and arrow traffic lights, executing stop deceleration control at a stop line and primary deceleration control from a position farther from the stop line when the red light is recognized but the arrow light's status is unknown, allowing for earlier initiation of slower deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vehicle waits to recognize the arrow signal before starting deceleration, then the deceleration control can be optimized based on the arrow direction, but the deceleration starts later causing larger acceleration changes and occupant discomfort
Solution Approach 1:
The system performs preliminary deceleration based on main light recognition before the arrow signal is fully recognized. The travel controller starts deceleration control when the red light is detected, and then adjusts the deceleration rate based on the subsequently recognized arrow signal direction, thereby avoiding delayed deceleration while maintaining optimization capability
Solution Approach 2:
The deceleration rate is made dynamic by adjusting it based on the recognized arrow signal direction. The system transitions from a fixed deceleration rate to a variable deceleration rate that adapts to the specific traffic situation indicated by the arrow signal, allowing optimization after preliminary action
2Loss of time
If the vehicle executes stop deceleration control immediately when red light is detected, then deceleration starts early, but if the arrow signal direction is not recognized, unnecessary deceleration may occur
Solution Approach 1:
The system uses feedback from the arrow signal recognition to adjust the deceleration control. The travel controller continuously monitors the recognition result of the arrow signal direction and adjusts the deceleration rate accordingly, eliminating unnecessary deceleration when the arrow indicates permission to proceed in the current direction
Solution Approach 2:
The deceleration rate transitions from a fixed stop deceleration rate to a dynamically adjusted rate based on arrow signal feedback. When the arrow signal indicates permission to proceed, the system reduces or cancels the deceleration, thereby avoiding harmful unnecessary acceleration changes
3Device complexity
If the vehicle uses a fixed deceleration rate for stop control, then the control is simple, but it cannot adapt to different traffic light situations causing occupant discomfort
Solution Approach 1:
The system implements dynamic deceleration rate adjustment based on the recognized traffic light state and arrow signal direction. The travel controller selects from multiple deceleration rates (first, second, third deceleration rates) depending on the specific situation, thereby improving occupant comfort without requiring complex additional hardware
Solution Approach 2:
The deceleration rate parameter is changed based on the recognized traffic light situation. The system changes the deceleration rate from a fixed value to a variable parameter that adapts to different scenarios (red light only, red light with stop arrow, red light with go arrow), improving comfort while maintaining relatively simple control logic
Data Source
AI summary
By a vehicle control device or a vehicle control method for controlling a speed of a vehicle, a lighting state of a main light of a traffic light and a travel permission direction of an arrow light of the traffic light is recognized, and stop deceleration control that starts deceleration control executed for stop at a stop line and primary deceleration control that decelerates the vehicle at a deceleration rate slower than a deceleration rate by the stop deceleration control are executed.