Steering Switch Asymmetric Layout for Tactile Differentiation
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Solution Overview
Problem
Conventional steering switches arranged adjacent to each other on a steering wheel are prone to mistaken operations due to differing distances from the driver's hand position, making it difficult to distinguish between the normal and power mode buttons.
Innovation Solution
The steering switches are arranged with the main switch and approval switch positioned closest to the rim of the steering wheel, with the approval switch located above the main switch and separated by a protruding member, allowing easy differentiation by touch and reducing the likelihood of incorrect operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If two switches are arranged side by side on the steering wheel, then the control functions are integrated and accessible, but the probability of wrong operation increases due to difficulty in distinguishing distances with fingertips
Solution Approach 1:
The patent applies local quality by giving each switch a distinct spatial characteristic - the first switch is positioned closer to the driver's hand while the second switch is positioned closer to the center of the steering wheel. This creates locally differentiated tactile feedback zones that allow the driver to distinguish between switches through touch alone, resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The patent employs asymmetry in the arrangement of switches on the steering wheel spoke. Rather than symmetric or uniformly spaced positioning, the switches are placed at asymmetric distances from the driver's hand, creating naturally distinguishable tactile zones. This asymmetric arrangement ensures that each switch has a unique positional signature that prevents wrong operations while maintaining accessibility.
2Device complexity
If switches are positioned closer to the center of the steering wheel, then the layout is more compact, but the distance from the driver's hand increases making tactile differentiation difficult
Solution Approach 1:
The patent resolves this contradiction by creating locally differentiated tactile zones through asymmetric positioning. The first switch maintains a greater distance from the center (closer to hand) while the second switch is positioned closer to the center, but each retains a distinct tactile identity through its unique positional relationship to the driver's hand, ensuring both compactness and tactile differentiation.
3Adaptability or versatility
If multiple switches are arranged on the steering wheel spoke, then the control functionality is enhanced, but the risk of accidental activation of wrong switch increases
Solution Approach 1:
The patent enhances control functionality by providing multiple switches with different functions (first switch for normal mode, second switch for power mode) while maintaining high operation accuracy through locally differentiated tactile positioning. Each switch occupies a distinct tactile zone on the spoke, allowing the driver to selectively activate the intended function without accidental activation of adjacent switches.
Solution Approach 2:
The asymmetric arrangement of switches on the spoke creates unique tactile signatures for each control function. The first switch positioned closer to the hand and the second switch positioned closer to the center establish asymmetric tactile zones that prevent accidental activation, thereby enabling versatile control functionality with high reliability.
Data Source
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AI summary
A steering switch is provided on a spoke of a steering wheel for steering a vehicle, and includes a main switch pressed to input an ON/OFF operation of a drive assistance system installed in the vehicle, and an approval switch pressed to input an approval of a lane change executed by the drive assistance system. The approval switch is arranged adjacent to the upper side of the main switch.