Shift Apparatus Directional Control for Erroneous Operation Prevention
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Solution Overview
Problem
Shift apparatuses in shift-by-wire systems are prone to erroneous operations due to unintentional external forces, particularly when the shift lever is accidentally hit by the driver, leading to incorrect mode selections.
Innovation Solution
The shift apparatus is designed with specific directional requirements for transitioning between modes, ensuring that the shift lever must be moved in distinct and non-opposite directions to select different transmission modes, incorporating a click mechanism and shift position switch to prevent erroneous operations and provide feedback to the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shift lever is moved in a simple linear direction from home position to neutral position, then the ease of operation is improved, but the reliability deteriorates due to erroneous operations from unintentional external forces
Solution Approach 1:
The patent applies dimensionality change by transitioning from a simple linear single-direction movement to a multi-directional path requiring sequential movements in different directions (first direction, then second direction perpendicular to the first). This dimensional complexity prevents accidental activation while maintaining operational clarity through structured directional sequences.
2Reliability
If the shift lever requires movement in multiple directions to select modes, then the reliability is improved by preventing erroneous operations, but the ease of operation deteriorates due to more complex操作 sequences
Solution Approach 1:
The patent segments the mode selection process into distinct sequential steps, where each direction change corresponds to a specific mode selection stage. The movement is divided into: first direction for initial mode selection, second perpendicular direction for alternative mode selection, and third direction opposite to first for returning. This segmentation provides clear tactile and visual feedback at each stage, making the complex sequence manageable and intuitive.
Data Source
AI summary
A shift apparatus includes a shift lever operable to select a first mode of a transmission when the shift lever is disposed at a first position and to select a second mode of the transmission when the shift lever is disposed at a second position, and a base supporting the shift lever. The shift lever automatically returns to a home position after selecting the first mode or the second mode. When moving the shift lever from the home position to the first position to select the first mode, the shift lever is moved in a first direction and then in a second direction which is different from and not directly opposite to the first direction. When moving the shift lever from the first position to the second position to select the second mode, the shift lever is moved in a third direction which is different from the first and second directions and not directly opposite to the second direction.