Parking Assist Shift Control for Unintended Vehicle Movement
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Solution Overview
Problem
Existing parking assist systems may cause vehicles to move in a direction opposite to the driver's intention after an automatic parking process is canceled, potentially leading to safety issues and driver confusion, especially when the vehicle is stopped at positions other than the intended switching position.
Innovation Solution
A parking assist system that includes a control device to manage the shift position by switching it to a parking or neutral position unless specific conditions are met, such as the vehicle being stopped outside a prescribed range or due to driver input, and includes a notification system to inform the driver of the shift position change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shift position is automatically switched to parking position when the vehicle is stopped, then the safety is improved by preventing unintended movement, but the convenience deteriorates because the driver cannot easily resume driving without manual intervention
Solution Approach 1:
The shift position control system dynamically adjusts its behavior based on real-time detection of driver intent through brake operation patterns. When the driver operates the brake input member, the system detects this as a potential driving intent signal and maintains the shift position in driving range, allowing quick resumption of driving. When no brake operation is detected, the system automatically switches to parking position to prevent unintended movement. This dynamic adaptation resolves the contradiction between safety and convenience.
Solution Approach 2:
The system implements feedback by continuously monitoring brake input member operations and using this information to adjust shift position control. The control device receives feedback from the brake operation detection device about driver actions, and this feedback loop enables the system to distinguish between temporary stops and genuine driving intent, thereby maintaining safety while improving operational convenience when the driver wishes to resume driving.
2Ease of operation
If the shift position is maintained in driving position during automatic parking, then the convenience is improved by allowing quick resumption of driving, but the safety deteriorates due to risk of unintended movement in opposite direction
Solution Approach 1:
The control device continuously receives feedback from the brake operation detection device to determine driver intent. When the driver operates the brake input member, this feedback signal triggers the system to maintain the shift position in driving range, enabling quick resumption of driving. This feedback mechanism ensures convenience is improved only when genuine driving intent is detected, thereby maintaining safety.
Solution Approach 2:
The system takes preliminary action by proactively maintaining the shift position in driving range when brake operation is detected, rather than waiting for the driver to manually change the shift position. This preliminary maintenance of driving readiness responds to the driver's implicit intent signal (brake operation), improving convenience while the system continues to monitor for actual driving resumption to ensure safety.
3Productivity
If the vehicle automatically switches travel direction at the switching position, then the productivity is improved by completing parking maneuver autonomously, but the safety worsens because the driver may not be aware of the direction change
Solution Approach 1:
The control device takes preliminary action by automatically switching the shift position to reverse range before the vehicle actually changes travel direction at the switching position. This preliminary shift position change prepares the vehicle for the upcoming direction change, and the system continues to monitor brake operations to detect if the driver intends to override this automatic behavior, thereby maintaining automation efficiency while enhancing safety awareness.
Data Source
AI summary
A parking assist system includes: a control device configured to control a vehicle, a vehicle position detecting device configured to detect a position of the vehicle; a shift device configured to be operated for changing a shift position; and a brake input member configured to be operated for driving a brake device. In a case where the vehicle is stopped at a position other than a target position and a switching position, the control device changes the shift position to a parking position or a neutral position unless a shift maintenance condition is satisfied. The shift maintenance condition includes at least one of condition (i) that the vehicle is stopped at a position out of a prescribed range according to an operation of the brake input member and a condition (ii) that a cause for which the vehicle has been stopped is removed.