Vehicle Warning Device Direction-Based Switching Logic
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Solution Overview
Problem
Existing vehicle warning systems fail to generate accurate warnings in parking lots, as the correlation between distance and speed of approaching vehicles is unclear, leading to incorrect or missed warnings, especially when vehicles approach from the front-rear direction.
Innovation Solution
A dual warning system that switches between two methods based on the approaching vehicle's direction, using a first method that calculates collision prediction time for widthwise approaches and a second method that uses a warning range for front-rear approaches, with the selection determined by the inclination angle of the approaching vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If collision prediction time is used as the warning criterion, then warnings are generated appropriately for moving objects approaching the vehicle, but warnings cannot be generated correctly when the approaching speed is small even if the distance is small
Solution Approach 1:
The patent changes the warning criterion parameter from collision prediction time to distance-based warning range. When the other vehicle approaches in the widthwise direction, the system switches to using distance as the primary parameter for generating warnings, which resolves the issue where small approaching speeds result in long collision prediction times that fail to trigger warnings despite small distances.
2Reliability
If collision prediction time is used as the warning criterion, then warnings are generated based on time to collision, but erroneous warnings may be generated when the distance is great but approaching speed is great
Solution Approach 1:
The patent changes the warning criterion from time-based to distance-based by introducing a warning range parameter. When the other vehicle approaches in the widthwise direction, the system uses the distance between vehicles compared against a predetermined warning range to determine whether to generate a warning, preventing erroneous warnings when distance is large despite high approaching speed.
3Ease of operation
If a single warning method is used for all approaches, then the system is simple to operate, but the system cannot adapt to different approaching directions and speeds
Solution Approach 1:
The patent implements a dynamic warning system that automatically switches between different warning methods based on the approaching direction of the other vehicle. The control section determines whether the other vehicle is approaching in the widthwise or front-rear direction and selectively applies the appropriate warning method, providing adaptability to different conditions while maintaining ease of operation through automatic switching.
Data Source
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AI summary
When a warning is generated for a driver of a vehicle (host vehicle) on the basis of approach information about a moving object (another vehicle) with respect to the host vehicle, a selection between generating a warning with a first warning method and generating a warning with a second warning method is determined in accordance with the moving direction of the moving object with respect to the host vehicle. In the first warning method, a predicted collision time, which is the predicted amount of time before the moving object will collide with the host vehicle, is calculated on the basis of the approach information, and the driver is warned only when the predicted collision time is less than a threshold value. In the second warning method, the distance between the moving object and the host vehicle is obtained as the approach information, and the driver is warned only when that distance is a value that corresponds to a value within a warning range.