Driving Assistance System Dynamic Stop Position
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Solution Overview
Problem
Conventional driving assistance systems fail to provide comfortable stop assistance when a traffic signal switches from an entry prohibition state to an entry permission state at the time of or just before the vehicle arrives at an intersection, leading to discomfort for the driver due to mismatched timing.
Innovation Solution
A driving assistance system that includes a stop assistance controller, an assistance necessity determining unit, and a determining position arithmetic unit, which adjusts the stop determining position based on the current traffic signal state and vehicle speed, allowing stop assistance when the signal state is an entry prohibition state, even if it changes to permission state upon arrival.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If stop assistance is not performed when the traffic signal switches from entry prohibition state to entry permission state at the time of arrival at the intersection, then the system operates according to conventional prediction, but the driver feels uncomfortable due to the mismatch between the visual recognition of the prohibition state and the lack of stop assistance
Solution Approach 1:
The system performs preliminary determination of whether stop assistance should be provided by comparing the current traffic signal state with the predicted state at the stop determining position. This preliminary action allows the system to prepare and execute stop assistance appropriately even when the signal state changes near the intersection, preventing driver discomfort without requiring overly complex real-time adjustments.
Solution Approach 2:
The system dynamically adjusts the stop assistance control based on the current display state of the traffic signal. By making the stop determining position and assistance necessity determination dependent on the real-time signal state, the system adapts to changing conditions, providing stop assistance when the signal switches from prohibition to permission state, thereby improving driver comfort while maintaining manageable control logic.
2Reliability
If the system predicts the traffic signal state at the stop determining position, then stop assistance can be accurately controlled, but the system may fail to provide stop assistance when the signal state changes between current time and arrival time
Solution Approach 1:
The system uses feedback by continuously monitoring the current display state of the traffic signal and comparing it with the predicted display state at the stop determining position. This feedback mechanism ensures that when the current state is entry prohibition and the predicted state is entry permission, the system appropriately provides stop assistance, maintaining both accuracy and adaptability to signal state changes.
Solution Approach 2:
The system changes the parameter of stop determining position based on the current traffic signal state. When the current state is entry prohibition and the predicted state at the stop determining position is entry permission, the system adjusts the stop determining position to ensure appropriate stop assistance is provided, thereby maintaining reliability while adapting to signal state changes.
3Device complexity
If the stop determining position is fixed at the stop line, then the control system is simple, but the system cannot account for vehicle speed variations and signal state changes
Solution Approach 1:
The system makes the stop determining position dynamic rather than fixed. By calculating the stop determining position based on current vehicle speed and the current display state of the traffic signal, the system adapts to varying conditions without requiring a completely complex control structure. This dynamic approach allows the system to maintain simplicity while improving adaptability.
Solution Approach 2:
The system changes the stop determining position parameter based on vehicle speed and traffic signal state. When the current state is entry prohibition and the predicted state is entry permission, the system adjusts the position parameter to an appropriate distance before the stop line, allowing the control system to remain relatively simple while adapting to different operating conditions.
Data Source
AI summary
A driving assistance system includes a stop assistance controller, an assistance necessity determining unit, and a determining position arithmetic unit. The stop assistance controller is configured to perform stop assistance of an own vehicle. The assistance necessity determining unit is configured to determine whether it is necessary to perform the stop assistance of the own vehicle based on a stop determining position where it is determined whether to perform the stop assistance of the own vehicle and a predicted display state of a traffic signal at a time the own vehicle arrives at the stop determining position. The determining position arithmetic unit is configured to determine the stop determining position according to a current display state of the traffic signal.