Power Window Pinching Detection Electrode System
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Solution Overview
Problem
Existing entrapment detection devices for doors and windows are bulky and complex due to the need for a pulse generator and associated wiring, which increases the number of components and manufacturing steps.
Innovation Solution
An entrapment detection device using a sensor electrode and a position detecting electrode with varying opposing areas and distances, allowing detection of entrapment and position through changes in electrostatic capacity, eliminating the need for a pulse generator and its associated wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pulse generator and associated wiring are used to detect position, then position detection is achieved, but the number of components increases and device size enlarges
Solution Approach 1:
The patent combines the position detection function with the entrapment detection electrode system. The same electrode that detects entrapment (through electrostatic capacity changes) also serves to detect position, eliminating the need for a separate pulse generator and its wiring. This merging of functions directly reduces component count while maintaining detection capabilities.
Solution Approach 2:
The electrode system is designed to perform multiple functions: entrapment detection and position detection. By making the electrode universal for both purposes, the patent eliminates redundant components like the pulse generator, thereby reducing device complexity without sacrificing measurement precision.
2Measurement precision
If a pulse generator and associated wiring are used to detect position, then position detection is achieved, but device size enlarges
Solution Approach 1:
The patent merges position detection into the existing electrode system, eliminating the need for separate pulse generator components and their wiring. This consolidation removes the volume occupied by these additional components, thereby reducing overall device size while maintaining position detection accuracy through electrostatic capacity measurements.
3Measurement precision
If more components are added to improve detection accuracy, then measurement precision improves, but manufacturing complexity increases
Solution Approach 1:
The patent combines position detection and entrapment detection functions into a single electrode system, reducing the number of components that need to be manufactured and assembled. This merging simplifies the manufacturing process while maintaining high detection accuracy through the use of electrostatic capacity measurements from the same electrode.
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 configuration reduces the number of components, prevents device enlargement, and enhances manufacturing efficiency by accurately detecting the position of the opening-closing body with higher precision and fewer components.
Implementation Method 1
the detection unit is configured to detect entrapment of an object from a change in electrostatic capacity of at least one of the sensor electrode and the position detecting electrode
Data Source
AI summary
This pinching detection device of a power window is provided with: a sensor electrode provided in a windowpane; a position-detecting electrode that opposes the sensor electrode; and a control unit. The size of an opposing surface area between the sensor electrode and the position-detecting electrode increases as the windowpane is raised. The control unit detects pinching of foreign matter on the basis of a change in capacitance in the sensor electrode and detects a position in the windowpane on the basis of the change in capacitance.