Parking Assistance Direction Display Hysteresis Control
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Solution Overview
Problem
Existing parking assistance systems often cause driver confusion due to rapid and frequent changes in the direction of travel indicated by the system, as the arrow in the pictogram switches between forward and reverse directions multiple times during a parking maneuver, especially when obstacles not accounted for in the original trajectory are encountered.
Innovation Solution
The system incorporates a hysteresis mechanism that suppresses further changes in the displayed direction of travel after an initial change due to an obstacle, requiring specific conditions such as time, distance, or gear changes to be met before allowing a change back to the planned direction, thereby reducing unnecessary direction changes and stabilizing the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the parking assistance system continuously monitors distance and changes direction immediately when safety distance is not reached, then collision prevention is improved, but the display stability deteriorates due to frequent direction changes
Solution Approach 1:
The system performs preliminary action by suppressing further direction changes after an initial change has been made. When the monitoring unit detects that the distance falls below the predetermined value, it triggers an initial change in displayed direction. Subsequently, the control device suppresses at least one predetermined further change, preventing immediate reversals and stabilizing the display while maintaining collision prevention through the initial corrective action.
2Reliability
If the system allows immediate direction changes when distance threshold is violated, then safety response is improved, but driver confusion increases due to rapid direction switching
Solution Approach 1:
The control device implements preliminary action by pre-establishing suppression logic that activates after an initial direction change. This ensures safety response is maintained through immediate initial changes when distance thresholds are violated, while driver confusion is reduced by preventing subsequent rapid reversals that would create flickering and uncertainty in the displayed instructions.
Solution Approach 2:
The system applies beforehand cushioning by introducing a suppression mechanism that cushions against excessive direction changes. After the initial corrective direction change is made in response to distance threshold violation, the suppression of predetermined further changes acts as a cushion, preventing over-reaction and stabilizing the display for the driver.
Data Source
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AI summary
The invention relates to the provision of driving instructions for a driver of a motor vehicle (10) during a parking maneuver. A maneuver (20) displays a planned parking direction (30) determined in accordance with the planned driving path (38) by means of a display unit (16) and, when the driver of the vehicle (10) guides the vehicle in the displayed driving direction, a distance (D) of the vehicle (10) to an obstacle (28) is detected by a sensor device (12). If the detected distance (D) falls below a predetermined distance value (Dmin), the displayed driving direction is initially changed by a monitoring unit (22) from the planned driving direction (30) to a different driving direction (32). The change between the planned driving direction (30) and the different driving direction (32) should not occur very often according to the invention. As a result, an additional change (36) of the displayed driving direction signaled by the maneuvering planning unit (20) and/or the monitoring unit (22) is prevented after the initial change (42).