Parking Assist Brake Threshold Logic for Obstacle Zones
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Solution Overview
Problem
Drivers in automatic parking systems lack clarity on when the system will suspend or continue parking based on brake operation speed, leading to uncertainty and potential safety issues.
Innovation Solution
A parking assist system with a control device that sets cancellation, suspension, and warning areas around the vehicle, using brake sensors to determine brake force thresholds and notify the driver, allowing the system to continue or suspend the automatic parking process based on obstacle detection and driver input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the automatic parking process is suspended or continued based on brake operation speed threshold, then the system can respond to driver intervention, but the driver cannot estimate which process will be executed
Solution Approach 1:
The system provides visual feedback by displaying different icon states (suspension icon vs. cancellation icon) based on obstacle position and brake operation. This allows the driver to understand which process will be executed before actually performing the brake operation, resolving the information asymmetry while maintaining automated control.
Solution Approach 2:
The system determines and displays the intended process outcome (suspension or cancellation) before the driver completes the brake operation. By evaluating obstacle position and brake operation amount in advance, the system prepares the appropriate process state and notifies the driver, allowing the driver to estimate the process outcome beforehand.
2Device complexity
If the system uses a single brake operation threshold for all obstacle positions, then the control logic is simple, but it cannot differentiate between obstacles in different areas
Solution Approach 1:
The system divides the space around the vehicle into multiple zones (cancellation area and suspension area) based on obstacle position. Each zone triggers a different process outcome, allowing the system to adapt to different obstacle positions while maintaining relatively simple control logic through clear spatial segmentation.
Solution Approach 2:
Different brake operation thresholds are applied based on the local condition of obstacle position. Obstacles in the cancellation area require a first threshold, while obstacles in the suspension area require a second threshold. This local differentiation allows the system to respond appropriately to different situations without overly complicating the overall control structure.
3Reliability
If the system stops the vehicle with strong brake force, then collision prevention is ensured, but the driver experiences discomfort and may not understand the system's intent
Solution Approach 1:
The system dynamically adjusts brake force based on the evaluation result and obstacle position. When an obstacle is in the suspension area, the system uses a relatively weak second brake force that stops the vehicle without causing discomfort. When an obstacle is in the cancellation area, the system uses a stronger first brake force. This dynamic adjustment maintains collision prevention while reducing driver discomfort.
Solution Approach 2:
The system notifies the driver in advance of the intended brake operation and process outcome before executing the brake command. This preliminary notification allows the driver to prepare for the brake force application, reducing the harmful effect of sudden strong braking while maintaining the reliability of collision prevention.
Data Source
AI summary
A parking assist system includes a control device. The control device continues an automatic parking process as a driver releases an operation on a brake pedal in a case where an obstacle is detected in a suspension area and an operation amount of the brake pedal has been equal to or more than a second threshold. The control device causes a brake device to stop a vehicle with a second brake force and suspends the automatic parking process in a case where the obstacle is detected in the suspension area and the operation amount of the brake pedal is less than the second threshold. The control device causes the brake device to stop the vehicle and cancels the automatic parking process in a case where the obstacle is detected in a cancellation area and the operation amount of the brake pedal is less than a first threshold.