Vehicle Door Handle Pressure Sensing With a Deformable Base
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Solution Overview
Problem
Existing door handle pressure detection systems face reduced accuracy due to increased distance between the pressure application point and the sensor, necessitating multiple sensors, which complicates the configuration and increases the risk of detection errors.
Innovation Solution
A detection device integrated into the vehicle door handle featuring a deformable substrate and a displaceable member connected to a strain sensor, allowing for accurate pressure detection at a single site by deforming in response to pressure application, thereby enhancing detection reliability without the need for multiple sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pressure sensor is provided at a substrate in a door handle, then pressure detection is enabled, but detection accuracy is reduced due to increased distance between the pressure application point and the sensor
Solution Approach 1:
The substrate is designed as a flexible, deformable component that transmits pressure from the pressure application point to the sensor. When pressure is applied to the door handle, the substrate deforms and this deformation is transmitted to the sensor, enabling accurate pressure detection even when the sensor is positioned at a distance from the pressure application point.
Solution Approach 2:
The substrate acts as an intermediary element between the pressure application point and the sensor. It mediates the transmission of mechanical pressure forces from the user's hand to the sensor, allowing the sensor to detect pressure indirectly through the substrate's deformation rather than requiring direct contact at the pressure application point.
2Reliability
If multiple sensors are used to maintain detection accuracy, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The flexible substrate serves as a force transmission medium that distributes and transmits pressure forces to the sensor, enabling a single sensor to effectively monitor pressure across different locations on the door handle, thereby maintaining detection reliability without requiring multiple sensors.
Solution Approach 2:
The substrate performs multiple functions: it provides structural support for the sensor, transmits pressure forces from various locations on the door handle to the sensor, and enables accurate pressure detection with a single sensor. This multi-functionality eliminates the need for multiple specialized sensors.
3Measurement precision
If multiple sensors are deployed to compensate for distance, then measurement precision is maintained, but manufacturing cost and configuration complexity increase
Solution Approach 1:
The deformable substrate acts as a mechanical amplifier and transmitter, converting pressure applied at a distance into localized deformation at the sensor position. This allows a single sensor to achieve the same detection accuracy that would otherwise require multiple sensors positioned closer to different pressure application points.
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 solution provides reliable pressure detection on the inner surface of the door handle with a simpler configuration, maintaining accuracy and reducing complexity by utilizing a single sensor to detect displacement caused by the deformation of the substrate and displaceable member.
Implementation Method 1
The base portion is configured to deform in response to a pressure applied to the inner casing
Implementation Method 2
a sensor configured to detect displacement of the displaceable portion
Data Source
AI summary
A detection device provided in an interior of a vehicle door handle including an inner casing includes a base portion, a displaceable member, and a sensor. The base portion has a longitudinal shape extending along a longitudinal direction of the door handle, is disposed fixedly to the inner casing, and is configured to deform in response to a pressure applied to the inner casing. The displaceable member has a longitudinal shape extending along the longitudinal direction of the door handle and is provided to face the base portion. Either or both of one end portion and the other end portion of the displaceable member are connected to the base portion. The displaceable member includes a displaceable portion configured to be displaced relatively to the base portion in accordance with deformation of the base portion. The sensor is configured to detect displacement of the displaceable portion.