Vehicular Door Handle Electrostatic Sensor Integration
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Solution Overview
Problem
Existing vehicular door handle systems suffer from deteriorated detection performance of sensors due to their placement away from the user's grip, leading to potential malfunctions and reduced reliability.
Innovation Solution
The vehicular door structure incorporates a lock sensor portion integrated into the unlatch portion of the door handle, which is exposed to the outside, allowing for reliable detection of electrostatic changes when the user grips the handle, and features a bent portion acting as a fulcrum for the unlatch mechanism, reducing component stress and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the lock sensor plate and unlock sensor plate are provided inside the door handle away from the user's grip position, then the door handle structure is simplified, but the detection performance of the sensors deteriorates
Solution Approach 1:
The door handle is divided into multiple portions: a grip portion for user contact and an unlatch portion containing the sensor. This segmentation allows the sensor to be positioned in the unlatch portion where it can detect electrostatic changes when the user operates the unlatch mechanism, while the grip portion maintains its primary function. The separation resolves the contradiction by allowing simplified overall structure while achieving good detection performance through strategic sensor placement in the operational portion.
Solution Approach 2:
The unlatch portion serves as an intermediary element between the user's grip action and the sensor detection system. When the user grips and operates the door handle, the unlatch portion moves and generates electrostatic capacity changes that the sensor detects. This intermediary mechanism translates mechanical operation into detectable electrical signals, achieving both structural simplicity and reliable detection.
2Volume of moving object
If the lock sensor portion is placed inside the door handle, then the overall structure is compact, but the sensor detection reliability deteriorates due to distance from user contact
Solution Approach 1:
The door handle is segmented into a grip portion and an unlatch portion, with the sensor placed in the unlatch portion. This segmentation allows the sensor to be positioned where it can reliably detect electrostatic changes during operation, while still maintaining a compact overall volume. The unlatch portion acts as the active detection zone that moves during operation, ensuring reliable detection without increasing overall handle size.
Solution Approach 2:
The unlatch portion is designed to move dynamically during door handle operation. As the user grips and operates the handle, the unlatch portion swings or moves, creating dynamic electrostatic capacity changes that the sensor detects. This dynamic positioning ensures the sensor remains in optimal detection position during operation while maintaining compact structure at rest.
3Strength
If the sensor is positioned away from the unlatch portion, then the sensor is protected from mechanical stress, but the detection performance deteriorates
Solution Approach 1:
The door handle is segmented so that the sensor is integrated into the unlatch portion rather than being separately mounted in the grip portion. This segmentation allows the sensor to be positioned where it can detect operational changes, while the unlatch portion's design naturally protects the sensor from excessive mechanical stress during normal operation. The sensor moves with the unlatch portion, maintaining detection capability without exposing it to damaging forces.
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 enhances sensor detection reliability, reduces the risk of sensor malfunctions, decreases component stress, and lowers overall costs by integrating the lock sensor as an energizing member within the unlatch mechanism.
Implementation Method 1
The lock sensor portion is configured to detect a change in an electrostatic capacity
Data Source
AI summary
A vehicular door structure includes a door handle provided in a door panel that configures a part of a vehicular door, a latch mechanism provided in the vehicular door and configured to be engaged with a striker provided on a vehicle body, an unlatch portion provided in the door handle and configured to be at least partially exposed to an outside and swing with respect to the door handle, an electric unlatch operation mechanism having an actuator that is configured to disengage the latch mechanism from the striker as the unlatch portion is made to swing, and a lock sensor portion provided in a part of the unlatch portion, the part being exposed to the outside, the lock sensor portion being configured to detect a change in an electrostatic capacity.