EAP Fluid Component for Vehicle Pressure Sensing and Valve Control
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Solution Overview
Problem
Existing vehicle comfort systems that utilize fluid components for pressure measurement and valve functions are costly due to the reliance on microelectromechanical systems (MEMS), which are expensive.
Innovation Solution
A fluid component with an actuator having at least two electrodes and electroactive polymer (EAP) sections between them, allowing for pressure measurement and valve control through voltage changes, eliminating the need for expensive MEMS by using electroactive polymers that deform in response to electrical stimuli.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MEMS are used for pressure measurement, then measurement precision is improved, but device cost increases
Solution Approach 1:
The patent replaces the mechanical MEMS pressure sensing system with an electroactive polymer-based actuator system that can perform both actuation and pressure sensing functions. The EAP material responds to electrical stimuli for actuation and simultaneously deforms under pressure for sensing, eliminating the need for separate expensive MEMS components while maintaining measurement capability.
Solution Approach 2:
The fluid component integrates multiple functions into a single device: the actuator with electroactive polymer serves both as an actuation mechanism (responding to voltage for opening/closing) and as a pressure sensing element (deforming under pressure for measurement). This multi-functionality reduces the overall system complexity and cost by eliminating separate MEMS pressure sensors.
2Reliability
If multiple separate components are used for actuation and pressure sensing, then functional reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the actuator and pressure sensor into a single integrated fluid component. The electroactive polymer actuator structure serves dual purposes: it acts as the actuation element when voltage is applied and simultaneously functions as the pressure sensing element when deformed by fluid pressure. This merging reduces the number of separate components and connections, simplifying the overall system while maintaining functional reliability through the inherent coupling of the dual functions.
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
This solution provides a cost-effective and versatile means to measure pressure and control fluid flow, enabling compact and integrative designs for vehicle comfort systems, such as seat adjustment and massage functions, while reducing the reliance on expensive MEMS technology.
Implementation Method 1
each actuator has at least two electrodes and at least one section having an electroactive polymer (EAP) arranged between them
Implementation Method 2
the or a detection device detects a voltage between the electrodes of the actuator and/or a capacitance of the actuator, and the evaluation device determines an associated pressure value from the voltage
Data Source
AI summary
A fluid component, a vehicle comfort system, and a method for operating the system in which the fluid component has the function of a pressure sensor and/or valve for a fluid-conducting system of a vehicle comfort system, and in which at least one actuator is accommodated, and preferably in a preferably fluid-tight or non-fluid-tight housing of the fluid component. Each actuator has at least two electrodes and at least one section arranged between them having an electroactive polymer (EAP), or a plurality of sections having an electroactive polymer (EAP) layered on top of one another.