Vehicle Door Electrostatic Sensor Layout for Compact Action Detection
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Solution Overview
Problem
Existing vehicle door control apparatuses with electrostatic sensor electrodes face limitations in size reduction due to the need for separate and overlapping electrode arrangements to ensure detection functionality, which restricts their ability to accurately distinguish between different users and detect door opening/closing instructions effectively.
Innovation Solution
A control apparatus for a vehicle door featuring a first electrostatic sensor electrode and a second electrode with an overlapping and non-overlapping region, where the electrodes switch between driven and grounded states to enhance detection area and sensitivity, allowing for reliable identification of user actions through electrostatic capacitance measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor electrode and auxiliary electrode are arranged on the same surface or different surfaces without overlapping, then each electrode can function independently for detection, but the sensor area becomes large and size reduction is limited
Solution Approach 1:
The patent merges the sensor electrode and auxiliary electrode into an overlapping arrangement where the auxiliary electrode partially overlaps the sensor electrode. This combining approach allows both electrodes to function simultaneously while reducing the total sensor area compared to completely separated arrangements.
Solution Approach 2:
The patent transitions from a two-dimensional side-by-side arrangement to a three-dimensional overlapping arrangement. By utilizing the vertical dimension and creating partial overlap between electrodes, the design achieves compact integration while maintaining detection functionality.
2Area of stationary object
If both electrodes are electrified in the detection state to ensure detection area, then detection coverage is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent implements dynamic switching between different detection states. The control unit alternates between a first detection state where only the sensor electrode is electrified and a second detection state where only the auxiliary electrode is electrified. This dynamic approach maintains detection area while simplifying the electrification control compared to continuously electrifying both electrodes.
Solution Approach 2:
The patent employs periodic switching between detection states using alternating periods. During each period, one electrode is electrified while the other is not, creating a time-multiplexed detection system. This periodic action reduces average power consumption and control complexity while maintaining effective detection coverage.
3Area of stationary object
If the electrodes are arranged to overlap partially, then the sensor size is reduced, but the detection sensitivity may be affected by potential interference
Solution Approach 1:
The patent uses dynamic state switching to manage electrode interactions. By alternating between states where different electrodes are electrified, the system reduces simultaneous interference while maintaining overlapping geometry for compact size. The temporal separation of electrification maintains detection sensitivity despite spatial overlap.
Solution Approach 2:
The control unit measures electrostatic capacitance values from both electrodes and uses this feedback to identify user actions. The feedback mechanism compensates for potential interference effects by analyzing capacitance changes from both electrodes, maintaining detection sensitivity despite the overlapping arrangement.
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 enables efficient detection of user actions with improved sensitivity and reduced sensor size by allowing the electrodes to operate at the same potential, enhancing the detection of both intentional and unintentional door interactions, while maintaining effective door control operations.
Implementation Method 1
identify an action instruction to the door for the vehicle on the basis of an electrostatic capacitance value measured at the first electrode and the second electrode
Data Source
AI summary
A control apparatus of a door for a vehicle includes a first electrode corresponding to an electrostatic sensor electrode including a first detection surface, and a second electrode corresponding to an electrostatic sensor electrode including a second detection surface including an overlapping region which overlaps with the first detection surface and a non-overlapping region. The control apparatus includes a control portion configured to switch between a first detection state in which the first electrode is driven and an electric potential of the second electrode is at a float, and a second detection state in which the second electrode is driven and an electric potential of the first electrode is in a grounded state, and configured to identify an action instruction to the door for the vehicle on the basis of an electrostatic capacitance value measured at the first electrode and the second electrode.