Capacitive Door Handle Operation Input Device
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Solution Overview
Problem
Existing vehicle door opening/closing control devices require direct hand contact and have a limited operation range, leading to complex structures and increased costs when handling multiple operation inputs.
Innovation Solution
An operation input device with a resistance element that generates capacitance between an operating medium and the resistance element, using AC power sources to measure electric charge transfer amounts and detect the position of the operating medium, allowing for varied operation inputs without restrictive range limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct hand contact with door handle is required for operation, then operation reliability is improved, but operation range is limited and device complexity increases for multiple inputs
Solution Approach 1:
The patent replaces the mechanical contact-based door handle operation with a capacitive sensing system. The sensing element detects the approach of the operating medium (hand) through capacitance changes in the electric field, eliminating the need for direct mechanical contact while maintaining reliable operation detection and expanding the operational range.
Solution Approach 2:
The patent introduces an electric field as an intermediary between the door handle and the user's hand. The sensing element generates an electric field that interacts with the conductive human body at a distance, serving as a mediator that transmits operational intent without requiring physical contact.
2Adaptability or versatility
If multiple operation inputs are supported, then adaptability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes the single sensing element universal by detecting different operational intents through variations in capacitance change patterns. The same sensing element can distinguish between different hand gestures, positions, and movement patterns, enabling multiple operation inputs without requiring multiple specialized sensors.
Solution Approach 2:
The patent utilizes changes in capacitance parameters (magnitude, rate of change, temporal patterns) to differentiate between various operation inputs. By monitoring how the capacitance value changes over time and in response to different hand movements, the system can interpret multiple types of operations from a single sensing element.
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
Enables accurate detection of finger position and gesture inputs with a simple structure, supporting multiple operation inputs without the need for direct contact, thus reducing complexity and cost.
Implementation Method 1
a resistance element configured to generate a capacitance between an operating medium and the resistance element in response to an approach of the operating medium to the resistance element
Data Source
AI summary
An operation input device includes a resistance element to generate a capacitance between an operating medium and the resistance element in response to an approach of the operating medium to the resistance element, and a power source to supply electric charge to one end and the other end of the resistance element. A first electric unit measures a first electric charge transfer amount supplied to the one end of the resistance element in response to generation of the capacitance. A second unit measures a second electric charge transfer amount supplied to the other end of the resistance element in response to generation of the capacitance. A controller is connected to the first and second units, and detects a position of the operating medium in a direction perpendicular to a surface of the resistance element based on a sum of the first and second electric charge transfer amounts.