Lane Departure Prevention Device with Direction Alignment Check
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Solution Overview
Problem
Existing lane departure prevention devices are susceptible to erroneous operations due to malfunctions, such as RAM failures, and have high calculation loads, which can lead to unsafe vehicle maneuvers.
Innovation Solution
A lane departure prevention device with a fail-safe function that uses simple logic to determine the departure avoidance direction based on the distance between the vehicle and lane lines, and only applies braking force control when the calculated yaw moment aligns with this direction, thereby preventing erroneous turns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a braking force controller is used to generate yaw moment for lane departure prevention, then the vehicle can avoid departing from the travelling lane, but erroneous operations may occur such as the vehicle turning in the direction of departing due to RAM malfunction
Solution Approach 1:
The system implements feedback by comparing the calculated departure avoidance direction with the actual vehicle turning direction. The direction alignment determination unit continuously monitors whether these directions coincide, and only activates braking force control when alignment is confirmed, creating a closed-loop control system that prevents erroneous operations
Solution Approach 2:
The system performs preliminary determination of the departure avoidance direction based on distance to lane lines before applying braking force. The direction alignment determination unit checks directional coincidence in advance, ensuring that braking control is only activated when the calculated direction is verified to be correct, preventing erroneous turns before they occur
2Measurement precision
If complex calculation logic is used to determine departure avoidance direction, then accurate lane departure prevention can be achieved, but the calculation load increases
Solution Approach 1:
The system segments the lane departure prevention function into distinct modular units: lane line recognition unit, departure determination unit, yaw moment calculation unit, direction determination unit, and direction alignment determination unit. Each unit performs a specific simplified calculation, reducing overall system complexity while maintaining accuracy through coordinated operation
Solution Approach 2:
Instead of calculating complex trajectories and inversion matrices to determine departure avoidance direction, the system inverts the approach by determining direction based on simple distance measurements to lane lines. The direction alignment determination then verifies correctness by checking if the vehicle turning direction matches the calculated avoidance direction
Data Source
AI summary
A lane departure prevention device includes: a travelling state recognition unit; a lane line recognition unit; a departure determination unit; a yaw moment calculation unit configured to calculate a target trajectory and a target yaw moment; a direction determination unit configured to determine the departure avoidance direction; a direction alignment determination unit configured to determine the turning direction of the vehicle by the target yaw moment coincides with the departure avoidance direction; and a braking force control unit configured to control the braking forces of the vehicle. In a case where the direction alignment determination unit determines that the results of determinations coincide with each other, the braking force control unit perform a braking force control, and in a case where the direction alignment determination unit doesn't determine that the results of determinations coincide with each other, the braking force control unit doesn't perform the braking force control.