Haptic Switch Assembly With Stacked PCBs for Low-Distraction Control
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Solution Overview
Problem
Conventional capacitive sense touchscreen technologies in vehicles are distracting for drivers and lack flexibility in controlling multiple functions, while mechanical switches are limited in functionality and require visual engagement.
Innovation Solution
A switch assembly with axially arranged printed circuit boards, force sensors, a haptic feedback system, and a touch overlay plate that provides tactile feedback and allows control of multiple functions with minimal footprint, reducing driver distraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitive sense touchscreen technologies are used, then control flexibility is improved, but driver distraction increases
Solution Approach 1:
The touchscreen is segmented into multiple independently controllable regions or zones, each capable of being activated or deactivated based on driving conditions. This allows the system to provide flexible control when needed while minimizing distraction by deactivating non-essential areas during critical driving moments.
Solution Approach 2:
The touchscreen employs periodic assessment of driving conditions to dynamically adjust its operational state. During periods of high driver attention demand, the touchscreen reduces activity or disables non-critical functions, while during periods of lower demand, it restores full functionality, creating a rhythmic pattern of activation and deactivation.
2Object-affected harmful factors
If mechanical switches are used, then driver distraction is reduced, but functional versatility is limited
Solution Approach 1:
The mechanical switch assembly incorporates multiple functions within a single physical component. Each switch can perform primary and secondary functions, and the system as a whole can control various vehicle systems including audio, climate, and navigation, replacing what would traditionally require multiple dedicated controls.
Solution Approach 2:
The mechanical switches incorporate tactile feedback mechanisms that provide physical confirmation of activation without requiring visual attention. This feedback system allows drivers to operate controls confidently through touch alone, maintaining safety while expanding functional capabilities.
3Area of stationary object
If multiple functions are integrated into a minimal footprint, then space efficiency is improved, but device complexity increases
Solution Approach 1:
The switch assembly employs a nested structure where components are arranged in concentric layers or stacked configurations. The mechanical switches, tactile sensors, and control circuitry are integrated in a compact, space-efficient arrangement that maximizes functionality within a minimal footprint.
Solution Approach 2:
The design transitions from two-dimensional layout to three-dimensional stacking, utilizing vertical space to accommodate multiple functional layers. This dimensional approach allows multiple switches and sensors to be integrated in a compact volume without increasing the horizontal footprint.
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
The switch assembly provides effective tactile feedback and flexible control of vehicle systems without requiring visual attention, enhancing driver safety and usability.
Implementation Method 1
One or more force sensors are disposed on one of the PCBs and, in some implementations, the one or more force sensors receive force input received by a touch overlay plate
Implementation Method 2
a haptic feedback system, and a touch overlay plate that provides tactile feedback
Data Source
AI summary
Various implementations include a switch assembly that includes a housing and at least two printed circuit boards (PCBs) that are disposed within the housing and are axially arranged relative to each other. One or more force sensors are disposed on one of the PCBs, and, in some implementations, the one or more force sensors receive force input received by a touch overlay plate. Signals from the force sensors are processed to determine a magnitude, acceleration, and/or location of the force input, and a haptic feedback response is received by the touch overlay plate. The haptic feedback response is based on the force magnitude, acceleration, and/or location of input, according to some implementations. Axially arranging the PCBs reduces the footprint of the switch assembly and allows for the inclusion of more electrical components in the switch assembly, according to some implementations.