Shift-By-Wire Knob Interlock for Exclusive Gear Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing shift-by-wire systems for vehicles allow simultaneous shifting to Reverse (R)/Neutral (N)/Drive (D) and Parking (P) gear positions, leading to erroneous operations and driver anxiety due to the separate sensing structures for each gear position.
Innovation Solution
A shift-by-wire system with a Hall sensor, rotatable knob, and button assembly that includes a concurrent operation limiting unit to mechanically prevent simultaneous rotation and pressing, ensuring distinct operations for R/N/D and P gear positions through a simplified sensing structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate sensing structures are used for R/N/D gear position and P gear position, then the system can detect all gear positions, but the system size increases and driver anxiety increases due to possibility of simultaneous operation
Solution Approach 1:
The patent combines separate sensing structures for R/N/D gear position and P gear position into a single integrated sensing structure. The Hall sensor and magnet assembly are merged into one unit that can detect both types of gear position changes, eliminating the need for separate PCBs and shift switches for different gear positions.
Solution Approach 2:
The integrated sensing structure serves multiple functions: it detects both R/N/D gear position changes through knob rotation and P gear position changes through button pressing, within a single unified system. This multi-functional design reduces overall system complexity while maintaining comprehensive gear position detection capability.
2Adaptability or versatility
If separate shift switches and PCBs are provided for R/N/D and P gear positions, then all gear positions can be controlled, but the package size increases and manufacturing cost increases
Solution Approach 1:
Multiple separate control components (shift switches and PCBs) for different gear positions are merged into a single integrated sensing structure with one Hall sensor and one magnet assembly, significantly reducing the overall package size while maintaining full gear position control capability.
Solution Approach 2:
The single sensing structure is designed to handle all gear position control requirements (R, N, D, and P positions) through universal detection mechanisms, eliminating the need for multiple specialized components and reducing package volume.
3Adaptability or versatility
If separate shift switches and PCBs are provided for R/N/D and P gear positions, then all gear positions can be controlled, but manufacturing cost increases
Solution Approach 1:
Multiple separate control components are merged into one integrated unit, reducing the total number of parts that need to be manufactured, assembled, and tested, thereby lowering manufacturing costs while maintaining full gear position control functionality.
Solution Approach 2:
A single universal sensing structure replaces multiple specialized components, simplifying the manufacturing process and reducing costs through economies of scale and reduced assembly complexity, while preserving adaptability to all gear positions.
4Device complexity
If a single integrated sensing structure is used, then system size is reduced and cost is reduced, but mechanical limiting mechanism is required to prevent simultaneous operation
Solution Approach 1:
The patent incorporates a mechanical limiting mechanism that prevents the button assembly from being pressed when the knob is rotated, and vice versa. This preliminary preventive action eliminates the possibility of simultaneous operation before erroneous commands can be generated, addressing the harmful factor proactively.
Solution Approach 2:
The mechanical limiting mechanism acts as an intermediary between the knob rotation operation and the button pressing operation, physically blocking one operation when the other is active. This mediator ensures that only one gear position change can be initiated at a time, preventing erroneous simultaneous commands.
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
Prevents erroneous shifting operations, reduces system size and cost, and enhances driver psychological stability by ensuring exclusive operations for each gear position, thereby improving marketability and design freedom.
Implementation Method 1
a button assembly configured to have a magnet provided to sense rotated and moved states thereof using the Hall sensor
Data Source
AI summary
A shift-by-wire system physically prevents shifting to the R/N/D gear position and shifting to the P gear position from being simultaneously performed. The shift-by-wire system includes a body configured to have a Hall sensor provided therein, a knob installed so as to be rotatable around an axis of the body, a button assembly moving in an axial direction of the body and having a magnet provided to sense rotated and moved states thereof using the Hall sensor and rotate together with the knob, and a concurrent operation limiting unit to mechanically limit movement of the button assembly in a state in which the knob is manipulated so as to be rotated, and to mechanically limit rotation of the knob in a state in which the button assembly is manipulated so as to be moved.