Shift by Wire Dial Separation for Autonomous Driving Safety
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Solution Overview
Problem
The existing shift by wire systems face issues with erroneous manipulation of the autonomous driving mode, particularly when shifting from P, R, or N gear to D gear, leading to potential overruns and incorrect activation of the steering function due to differing manipulation speeds among drivers.
Innovation Solution
A shift by wire system that systematically separates the shift dial and autonomous driving dial, where the autonomous driving dial is hidden in P and R gears but exposed in D gear, allowing for effortless selection of the autonomous driving mode by integrating a detent mechanism and elastic return devices to ensure precise gear engagement and prevent unintended shifting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the autonomous driving mode is selected by a single manipulation in the D gear, then the switching to autonomous driving mode is swift, but the possibility of erroneous manipulation increases
Solution Approach 1:
The system requires the shift dial to be pressed down before rotation to engage the detent mechanism, which is a preliminary action that must be completed before the gear can be shifted. This preliminary pressing action ensures intentional engagement and prevents accidental shifting while maintaining swift operation for trained users
Solution Approach 2:
The detent mechanism provides tactile feedback through distinct engagement positions and audible clicks, confirming to the user that the gear has been properly engaged. This feedback mechanism reduces erroneous manipulation by ensuring the user knows the exact state of the shift mechanism
2Adaptability or versatility
If the shift mechanism is manipulated twice consecutively in the D gear to shift to the autopilot mode, then the steering function can be activated, but the vehicle may recognize only one manipulation causing steering function erroneous manipulation
Solution Approach 1:
The system provides tactile and visual feedback to confirm each manipulation step. The detent mechanism produces distinct engagement sensations for different gear positions, and the display shows the current gear state, ensuring the user and system both recognize the manipulation accurately
Solution Approach 2:
The patent replaces ambiguous mechanical manipulation recognition with electronic sensors and control systems that can precisely detect and count individual manipulation events, ensuring accurate recognition of single vs. double manipulations for autopilot mode activation
3Ease of operation
If the autonomous driving dial is always exposed, then the autonomous driving mode can be easily selected, but the risk of erroneous activation in P or R gear increases
Solution Approach 1:
The autonomous driving dial dynamically changes its accessibility based on the engaged gear position. It is hidden or inaccessible in P and R gears, and only becomes accessible when D gear is engaged. This dynamic adaptation prevents erroneous activation while maintaining ease of operation when appropriate
Solution Approach 2:
The shift dial acts as an intermediary mechanism that controls access to the autonomous driving dial. By requiring the shift dial to be in D gear position, it mediates and prevents direct access to the autonomous driving functions in inappropriate gear states
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution prevents erroneous manipulation of the autonomous driving mode by ensuring the autonomous driving dial can only be activated in the D gear, enhancing safety and convenience by requiring a slight pressing action on the shift dial and eliminating the need for a separate manipulation device, thus downsizing the shift device package and improving interior layout flexibility.
Implementation Method 1
a shift dial return device providing elastic resilience to the shift dial that linearly moved
Data Source
AI summary
A shift by wire system is configured to systematically separate a shift dial and an autonomous driving dial, thereby preventing an erroneous manipulation of an autonomous driving mode and allowing effortless selection of the autonomous driving mode. The shift by wire system includes a shift dial shifting to engage a stop gear, a reverse gear, and a forward gear and an autonomous driving dial hidden by the shift dial in the stop gear or reverse gear and exposed from the shift dial in the forward gear to implement the autonomous driving mode.